Patent Publication Number: US-9833966-B2

Title: Web adhesive application device and adhesive application method as well as cardboard sheet manufacturing device

Description:
RELATED APPLICATIONS 
     The present application is a National Stage of PCT International Application No. PCT/JP2013/075139, filed Sep. 18, 2013, which claims the benefit of priority from Japanese Patent Application No. 2012-258024, filed Nov. 26, 2012. 
     TECHNICAL FIELD 
     The present invention relates to a single-face corrugated cardboard sheet-adhesive application device that applies adhesive liquid to apex portions of corrugated portions of a single-face corrugated cardboard sheet formed by gluing a liner to a corrugating medium, a method of applying an adhesive to a single-face corrugated cardboard sheet, and a corrugated cardboard sheet manufacturing apparatus that manufactures a double-face corrugated cardboard sheet by gluing liners to both sides of a corrugating medium. 
     BACKGROUND ART 
     A corrugating machine as a corrugated cardboard sheet manufacturing apparatus includes a single facer that forms a single-face corrugated cardboard sheet and a double facer that forms a double-face corrugated cardboard sheet by gluing bottom liner board paper to a single-face corrugated cardboard sheet. The single facer corrugates a corrugating medium that is fed from a mill roll stand, and forms a single-face corrugated cardboard sheet by gluing a top liner board, which is fed from another mill roll stand, to the corrugating medium. The single-face corrugated cardboard sheet, which is formed by the single facer, is sent to a bridge provided on the downstream side, and is sent to a double facer, which is provided on the downstream side, according to the speed thereof while being stored in the double facer. The double facer forms a double-face corrugated cardboard sheet by gluing a bottom liner board, which is sent from a separate mill roll stand, to the single-face corrugated cardboard sheet sent from the bridge. After predetermined slits or ruled lines are formed on the double-face corrugated cardboard sheet, which has passed through the double facer, in a conveying direction by a slitter scorer, the double-face corrugated cardboard sheet forms corrugated cardboard sheets by being cut in the width direction with a cutoff. The corrugated cardboard sheets are stacked on a stacker, and are sequentially discharged. 
     A bottom liner board is glued to the single-face corrugated cardboard sheet, which is formed by the single facer, by the double facer, so that the double-face corrugated cardboard sheet is formed. Accordingly, the corrugating machine is provided with an adhesive application device that applies adhesive liquid to apex portions of corrugated portions of the single-face corrugating medium (the single-face corrugated cardboard sheet). The adhesive application device applies adhesive liquid, which is stored in an adhesive liquid tank, to an adhesive application roller, and can transfer the adhesive liquid, which is applied to the adhesive application roller, to the apex portions of corrugated portions of the single-face corrugated cardboard sheet after adjusting the thickness of the adhesive liquid, which is applied to the adhesive application roller, to a set thickness by a doctor roller. 
     In this case, the width of the adhesive liquid, which is applied to the single-face corrugated cardboard sheet by the adhesive application device, needs to be adjusted according to the width of the bottom liner board that is to be glued to the single-face corrugated cardboard sheet. When the width of the adhesive liquid applied to the single-face corrugated cardboard sheet is not a width according to the width of the bottom liner board, the adhesive liquid is extruded from end portions of the bottom liner board. Accordingly, when the single-face corrugated cardboard sheet and the bottom liner board are sent to the double facer and travel on a hot plate, the adhesive liquid is applied to the hot plate and is solidified. For this reason, there is a concern that a single-face corrugated cardboard sheet and a bottom liner board to be subsequently conveyed may be damaged. 
     For example, there are means disclosed in the following PTLs as means for solving the problem. A liquid transfer device disclosed in PTL 1 includes a doctor roller that scrapes off surplus liquid applied to an applicator roller, a pair of damming plates that are spaced apart from each other in the axial direction of the applicator roller, and regulating parts that are provided on the damming plates and commonly come into contact with the peripheral surfaces of both the rollers facing each other. Further, an adhesive application method and an adhesive application device of a corrugated cardboard manufacturing apparatus disclosed in PTL 2 include dam plates that are provided on the upstream side of a doctor roller and adjust the thickness of adhesive liquid of a region inside an end of a single-face corrugated cardboard sheet, and elastic scrapers that are provided on the downstream side of the dam plates and remove adhesive liquid in a region inside an end of the single-face corrugated cardboard sheet. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] Japanese Patent No. 2813719 
     [PTL 2] Japanese Unexamined Patent Application Publication No. 2011-212919 
     SUMMARY OF INVENTION 
     Technical Problem 
     In the above-mentioned liquid transfer device of PTL 1, the regulating parts are provided at end portions of the applicator roller in the axial direction. However, since the applicator roller is rotated at a high speed and scrapes off a large amount of adhesive liquid, it is difficult to prevent the extrusion of adhesive liquid by only the regulating parts. Further, the elastic scrapers and the dam plates are provided in the adhesive application method and the adhesive application device of the corrugated cardboard manufacturing apparatus disclosed in PTL 2, but there is a concern that the adhesive liquid may wrap around the dam plates and be extruded to the outside due to a viscous force thereof. 
     The invention has been made to solve the above-mentioned problems, and an object of the invention is to provide a web adhesive application device, a method of applying an adhesive to a web, and a corrugated cardboard sheet manufacturing apparatus that can prevent the extrusion of adhesive liquid from ends of a web. 
     Solution to Problem 
     In order to achieve the object, the invention provides a web adhesive application device including: an adhesive liquid tank that stores adhesive liquid; an adhesive application roller that allows the adhesive liquid of the adhesive liquid tank to be applied to a surface thereof and transfers the adhesive liquid to an adhesive application region of a web; a doctor roller that adjusts a thickness of the adhesive liquid applied to the adhesive application roller to a preset thickness; a scraping member that scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with a surface of the adhesive application roller on an upstream side of a nip portion between the adhesive application roller and the doctor roller in a rotational direction; and a damming member that dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller on the upstream side of the nip portion between the adhesive application roller and the doctor roller in the rotational direction and on a downstream side of a contact position of the scraping member in the rotational direction. 
     Accordingly, when the adhesive liquid of the adhesive liquid tank is applied to the surface of the adhesive application roller through the rotation of the adhesive application roller, first, the scraping member scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with the surface of the adhesive application roller, the damming member then dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller, and the doctor roller transfers the adhesive liquid, which is applied to the surface of the adhesive application roller, to the web after adjusting the thickness of the adhesive liquid, which is applied to the adhesive application region of the adhesive application roller, to a set thickness. That is, after the scraping member scrapes off the adhesive liquid, which is applied outside the adhesive application region, the damming member dams the adhesive liquid that is extruded from the adhesive application region. Accordingly, the extrusion of the adhesive liquid of the adhesive application region toward the end portions of the web in the width direction can be prevented. 
     In the web adhesive application device of the invention, the damming member is provided with a first curved contact surface that has a predetermined width in an axial direction of the adhesive application roller, has a predetermined length in a circumferential direction of the adhesive application roller, and comes into contact with the surface of the adhesive application roller; and the first curved contact surface extends to a nip portion between the adhesive application roller and the doctor roller. 
     Accordingly, the first curved contact surface of the damming member extends along the surface of the adhesive application roller to the nip portion between the adhesive application roller and the doctor roller. Therefore, since it is possible to dam the adhesive liquid to the nip portion between the adhesive application roller and the doctor roller by the first curved contact surface, it is possible to prevent the adhesive liquid from being extruded from the adhesive application region when the thickness of the adhesive liquid is adjusted to a set thickness by the doctor roller. 
     In the web adhesive application device of the invention, the damming member is provided with a second curved contact surface that comes into contact with a surface of the doctor roller, and the second curved contact surface extends to the nip portion between the adhesive application roller and the doctor roller. 
     Accordingly, the second curved contact surface of the damming member extends along the surface of the adhesive application roller to the nip portion between the adhesive application roller and the doctor roller. Therefore, the first curved contact surface dams the adhesive liquid to the nip portion between the adhesive application roller and the doctor roller, and the second curved contact surface can prevent the adhesive liquid from being extruded from the adhesive application roller to the doctor roller when the doctor roller adjusts the thickness of the adhesive liquid to a set thickness. 
     In the web adhesive application device of the invention, the scraping member is elastically deformable, and a deformation region is formed between the scraping member and the damming member. 
     Accordingly, when the scraping member scrapes off the adhesive liquid applied outside the adhesive application region by coming into pressure contact with the surface of the adhesive application roller, the scraping member is elastically deformed. However, since the deformation region is formed at the damming member, the scraping member enters the deformation region and can appropriately scrape off the adhesive liquid, which is applied to the surface of the adhesive application roller, without coming into contact with the damming member. 
     In the web adhesive application device of the invention, the damming member is supported so as to be pressed against the surface of the adhesive application roller. 
     Accordingly, since the damming member can come into close contact with the surface of the adhesive application roller without a clearance, the damming member can prevent the adhesive liquid from being extruded from the adhesive application region. Further, even when the contact surface of the damming member coming into contact with the adhesive application roller is worn out, the damming member can always come into close contact with the surface of the adhesive application roller. Accordingly, the damming member can prevent the adhesive liquid from being extruded from the adhesive application region for a long period of time. 
     The web adhesive application device of the invention further includes a plurality of biasing members that press the damming member against the surface of the adhesive application roller. 
     Accordingly, since the damming member is pressed against the surface of the adhesive application roller by the plurality of biasing members, the damming member can stably come into close contact with the surface of the adhesive application roller. Therefore, the damming member can prevent the adhesive liquid from being extruded from the adhesive application region. 
     In the web adhesive application device of the invention, the damming member is supported so as to be slidable in a direction which is orthogonal to axial directions of the adhesive application roller and the doctor roller and in which the damming member is adjacent to the adhesive application roller and the doctor roller. 
     Accordingly, since the damming member is slidably supported, the damming member can appropriately come into contact with the surface of the adhesive application roller regardless of a state in which the damming member or the adhesive application roller is mounted. 
     In the web adhesive application device of the invention, the damming member has a predetermined width in the axial direction of the adhesive application roller, and one end portion of the damming member in a width direction corresponds to an end portion of the adhesive application region in the width direction; and the scraping member has a predetermined width in the axial direction of the adhesive application roller, and one end portion of the scraping member in the width direction corresponds to an end portion of the adhesive application region in the width direction or extends within the adhesive application region by a predetermined length. 
     Accordingly, the scraping member can appropriately scrape off the adhesive liquid that is applied outside the adhesive application region and the damming member can appropriately prevent the adhesive liquid from being extruded from the adhesive application region. Further, when one end portion of the scraping member extends within the adhesive application region, the scraping member scrapes off not only the adhesive liquid outside the adhesive application region but also the adhesive liquid of a part of the inside of the adhesive application region. Accordingly, even though the scraping member and the damming member are spaced apart from each other by a predetermined distance, the damming member can appropriately prevent the adhesive liquid from being extruded from the adhesive application region. 
     In the web adhesive application device of the invention, a metal layer is provided on the surface of the adhesive application roller, and a resin layer is formed on the contact surface of the damming member. 
     Accordingly, since the damming member of which the surface is made of a resin comes into contact with the adhesive application roller of which the surface is made of metal, damage to the surface of the adhesive application roller is prevented. As a result, it is possible to appropriately prevent the adhesive liquid from being extruded from the adhesive application region for a long period of time. 
     In the web adhesive application device of the invention, the scraping member and the damming member are supported by the same support member. 
     Accordingly, since it is possible to improve the mountability of the scraping member and the damming member and to adjust the positions of the scraping member and the damming member by only adjusting the position of the support arm, it is possible to improve workability. 
     In the web adhesive application device of the invention, the support member is positioned relative to a device frame by three support faces along directions that cross each other. 
     Accordingly, since the support member can be positioned on the device frame by three support faces, the scraping member and the damming member can be easily positioned through the support member. Accordingly, it is possible to improve positioning accuracy and mounting workability. 
     In the web adhesive application device of the invention, the device frame is provided with a moving member that is movable in the axial direction of the adhesive application roller, and the support member is supported by the moving member. 
     Accordingly, since the support member is moved by the moving member, the positions of the scraping member and the damming member can be easily changed according to the width of the web. Therefore, versatility can be improved. 
     In the web adhesive application device of the invention, the web is a single-face corrugated cardboard sheet in which a second liner is glued to a corrugating medium, and the damming member is disposed inside a position of an end portion of a first liner, which is glued to the corrugating medium of the single-face corrugated cardboard sheet, in the width direction by the moving member. 
     Accordingly, it is possible to prevent the adhesive liquid of the adhesive application region from being extruded to the end portion of the first liner in the width direction regardless of the change of the width of the first liner. 
     In the web adhesive application device of the invention, the position of the end portion of the first liner in the width direction is output from a production management device. 
     Accordingly, it is possible to appropriately position the damming member. 
     In the web adhesive application device of the invention, the position of the end portion of the first liner in the width direction is output from a sensor that detects the end portion of the first liner in the width direction. 
     Accordingly, it is possible to appropriately position the damming member. 
     In the web adhesive application device of the invention, the adhesive liquid tank includes a bottom plate of which one end portion is disposed with a predetermined clearance interposed between the bottom plate and the surface of the adhesive application roller, a pair of side plates which are connected to both side portions of the bottom plate and of which each of one end portions is disposed so as to be pressed against the surface of the adhesive application roller, and a regulating plate that is connected to the other end portion of the bottom plate and allows the stored adhesive liquid to overflow; and a storage pan is disposed below the adhesive liquid tank. 
     Accordingly, since the adhesive liquid tank includes the bottom plate and the pair of side plates and the regulating plate, it is possible to simplify the structure of the adhesive liquid tank and to reduce the amount of the adhesive liquid stored in the adhesive liquid tank. Therefore, it is possible to reduce operating costs. Further, since a predetermined clearance is formed between the bottom plate and the adhesive application roller, it is possible to prevent damage to the surface of the adhesive application roller. In this case, the adhesive liquid of the adhesive liquid tank flows downward from the clearance between the adhesive application roller and the bottom plate during the stop of the adhesive application roller, but the adhesive liquid having flowed downward is stored in the storage pan. Accordingly, adhesive liquid can be easily collected. 
     The web adhesive application device of the invention further includes a circulation path allowing adhesive liquid, which falls down from a predetermined clearance between the adhesive application roller and the bottom plate, and adhesive liquid, which overflows the regulating plate, to be filtered and to return to the adhesive liquid tank. 
     Accordingly, since adhesive liquid, which falls down from a predetermined clearance between the adhesive application roller and the bottom plate, and adhesive liquid, which overflows the regulating plate, are made to return to the adhesive liquid tank by the circulation path after being filtered, the adhesive liquid can be easily collected and foreign substances mixed with the adhesive liquid can be easily removed. Therefore, stable work for applying an adhesive can be performed. 
     Further, the invention provides a method of applying an adhesive to a web including: applying adhesive liquid to a surface of an adhesive application roller through a rotation of the adhesive application roller; scraping off adhesive liquid, which is applied outside a web adhesive application region, by making a scraping member come into pressure contact with the surface of the adhesive application roller; damming adhesive liquid, which is extruded from the adhesive application region, by making a damming member come into contact with the surface of the adhesive application roller; adjusting a thickness of the adhesive liquid, which is applied to the web adhesive application region of the adhesive application roller, to a preset thickness by a doctor roller; and transferring the adhesive liquid, which is applied to the surface of the adhesive application roller, to the web. 
     Accordingly, after the scraping member scrapes off the adhesive liquid, which is applied outside the adhesive application region, the damming member dams the adhesive liquid that is extruded from the adhesive application region. Therefore, the extrusion of the adhesive liquid of the adhesive application region toward the end portions of the web in the width direction can be prevented. 
     Furthermore, the invention provides a corrugated cardboard sheet manufacturing apparatus including: a single facer that manufactures a single-face corrugated cardboard sheet by gluing a second liner to the corrugating medium; a glue machine that applies adhesive liquid to apex portions of corrugated portions of the single-face corrugated cardboard sheet; and a double facer that manufactures a double-face corrugated cardboard sheet by gluing a first liner to a corrugating medium side of the single-face corrugated cardboard sheet. The glue machine is provided with the web adhesive application device. 
     Accordingly, the single facer manufactures the single-face corrugated cardboard sheet by gluing the second liner to the corrugating medium, the glue machine applies adhesive liquid to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet, and the double facer manufactures the double-face corrugated cardboard sheet by gluing the first liner to the corrugating medium side of the single-face corrugated cardboard sheet that is manufactured by the single facer. At this time, in the glue machine, when the adhesive liquid of the adhesive liquid tank is applied to the surface of the adhesive application roller through the rotation of the adhesive application roller, first, the scraping member scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with the surface of the adhesive application roller, the damming member then dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller, and the doctor roller transfers the adhesive liquid, which is applied to the surface of the adhesive application roller, to the web after adjusting the thickness of the adhesive liquid, which is applied to the adhesive application region of the adhesive application roller, to a set thickness. That is, after the scraping member scrapes off the adhesive liquid, which is applied outside the adhesive application region, the damming member dams the adhesive liquid that is extruded from the adhesive application region. Accordingly, the extrusion of the adhesive liquid of the adhesive application region toward the end portions of the web in the width direction can be prevented. 
     Advantageous Effects of Invention 
     According to the web adhesive application device, the method of applying an adhesive to a web, and the corrugated cardboard sheet manufacturing apparatus of the invention, the web adhesive application device includes: the scraping member that scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with the surface of the adhesive application roller on the upstream side of the nip portion between the adhesive application roller and the doctor roller in the rotational direction; and the damming member that dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller on the upstream side of the nip portion between the adhesive application roller and the doctor roller in the rotational direction and on the downstream side of the contact position of the scraping member in the rotational direction. Accordingly, the extrusion of the adhesive liquid of the adhesive application region toward the end portions of the web in the width direction can be prevented. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic view showing a corrugating machine as a corrugated cardboard sheet manufacturing apparatus according to an embodiment of the invention. 
         FIG. 2  is a schematic view showing a web adhesive application device of this embodiment. 
         FIG. 3  is a plan view showing main parts of a glue machine. 
         FIG. 4  is a front view showing a scraping member and a damming member. 
         FIG. 5  is a plan view showing the scraping member and the damming member. 
         FIG. 6  is a schematic view showing a state in which the scraping member and the damming member are mounted. 
         FIG. 7  is a schematic view showing the disposition of the scraping members and the damming members on the adhesive application roller. 
         FIG. 8A  is a schematic view showing an adhesive application region W of a single-face corrugated cardboard sheet D. 
         FIG. 8B  is a schematic view showing the adhesive application region W of the single-face corrugated cardboard sheet D that is shifted in a width direction. 
         FIG. 8C  is a schematic view showing an adhesive application region W of a narrow single-face corrugated cardboard sheet D. 
         FIG. 8D  is a schematic view showing an adhesive application region W of a wide single-face corrugated cardboard sheet D. 
         FIG. 9  is a schematic view showing a circulation path of adhesive liquid in the glue machine. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Preferred embodiments of a web adhesive application device, a method of applying an adhesive to a web, and a corrugated cardboard sheet manufacturing apparatus of the invention will be described in detail below with reference to the accompanying drawings. Meanwhile, the invention is not limited by the embodiments, and includes combinations of the respective embodiments when there are plural embodiments. 
     Embodiment 
       FIG. 1  is a schematic view showing a corrugating machine as a corrugated cardboard sheet manufacturing apparatus according to an embodiment of the invention. 
     In this embodiment, as shown in  FIG. 1 , a corrugating machine  10  as a corrugated cardboard sheet manufacturing apparatus manufactures a single-face corrugated cardboard sheet D by gluing, for example, a top liner board C serving as a second liner to the corrugating medium B and manufactures a double-face corrugated cardboard sheet E by gluing, for example, a bottom liner board A serving as a first liner to the corrugating medium B of the manufactured single-face corrugated cardboard sheet D. 
     The corrugating machine  10  includes a mill roll stand  11  for the corrugating medium B, a preheater (preheating device)  12 , a mill roll stand  13  for the top liner board C, a preheater (preheating device)  14 , a single facer  15 , a bridge  16 , a mill roll stand  17  for the bottom liner board A, a preheater (preheating device)  18 , a glue machine  19 , a double facer  20 , rotary shears  21 , a slitter scorer  22 , a cutoff  23 , and a stacker  24 . 
     Rolls of paper are mounted on both sides of the mill roll stand  11 , and the roll of paper is formed by winding the corrugating medium, on which the corrugating medium B is formed, in the form of a roll. A splicer (splicing device)  11   a , which performs splicing, is provided above the rolls of paper. When paper is fed from one roll of paper, the other roll of paper is mounted for the preparation of splicing. When a small amount of base paper of one roll of paper remains, the base paper of one roll of paper is spliced to base paper of the other roll of paper by the splicer  11   a . Further, while the base paper is fed from the other roll of paper, one roll of paper is mounted for the preparation of splicing. Base paper is sequentially spliced in this way and is continuously delivered to the downstream side from the mill roll stand  11 . 
     Meanwhile, rolls of paper, which are formed by winding the top liner board C in the form of a roll, are mounted on both sides of the mill roll stand  13 , and a splicer  13   a  performing splicing is provided above the rolls of paper. When paper is fed from one roll of paper, the other roll of paper is mounted for the preparation of splicing. When a small amount of base paper of one roll of paper remains, the base paper of one roll of paper is spliced to base paper of the other roll of paper by the splicer  13   a . Further, while the base paper is fed from the other roll of paper, one roll of paper is mounted for the preparation of splicing. Base paper is sequentially spliced in this way and is continuously delivered to the downstream side from the mill roll stand  13 . 
     The preheaters  12  and  14  preheat the corrugating medium B and the top liner board C, respectively. Each of the preheaters  12  and  14  includes a heating roller into which steam is supplied, and the base paper (the corrugating medium B and the top liner board C) continuously delivered from the mill roll stands  11  and  13  are conveyed while being wound on the heating rollers. Accordingly, the temperature of the base paper rises to a predetermined temperature. 
     The single facer  15  includes a pressing belt  15   a , an upper corrugating roller  15   b , and a lower corrugating roller  15   c . The top liner board C, which is heated by the preheater  14 , is transferred to a nip portion between the pressing belt  15   a  and the upper corrugating roller  15   b . Meanwhile, the corrugating medium B, which is heated by the preheater  12 , is transferred to the nip portion between the pressing belt  15   a  and the upper corrugating roller  15   b  after being corrugated by an engagement portion between the upper and lower corrugating rollers  15   b  and  15   c.    
     An adhesive application device  15   d  is disposed near the upper corrugating roller  15   b . The adhesive application device  15   d  includes an adhesive application roller that applies an adhesive to the corrugating medium B. An adhesive is applied to an apex portion of each corrugated portion of the corrugating medium B, which is corrugated by the engagement portion between the upper and lower corrugating rollers  15   b  and  15   c , by the adhesive application device  15   d  (adhesive application roller); and the corrugating medium B is glued to the top liner board C at the nip portion between the pressing belt  15   a  and the upper corrugating roller  15   b . As a result, the single-face corrugated cardboard sheet D is formed. 
     A take-up conveyor  31  is provided obliquely above the single facer  15  on the downstream side in a conveying direction. The take-up conveyor  31  includes a pair of endless belts, and has a function to hold the single-face corrugated cardboard sheet D, which is formed by the single facer  15 , and to convey the single-face corrugated cardboard sheet D to the bridge  16 . The bridge  16  functions as a staying unit that makes the single-face corrugated cardboard sheet D primarily stay to absorb a speed difference between the single facer  15  and the double facer  20 . 
     Rolls of paper, which are formed by winding the bottom liner board A in the form of a roll, are mounted on both sides of the mill roll stand  17 , and a splicer  17   a  performing splicing is provided above the rolls of paper. When paper is fed from one roll of paper, the other roll of paper is mounted for the preparation of splicing. When a small amount of base paper of one roll of paper remains, the base paper of one roll of paper is spliced to base paper of the other roll of paper by the splicer  17   a . Further, while the base paper is fed from the other roll of paper, one roll of paper is mounted for the preparation of splicing. Base paper is sequentially spliced in this way and is continuously delivered to the downstream side from the mill roll stand  17 . 
     The preheater  18  includes a heating roller  32  for the single-face corrugated cardboard sheet D (hereinafter, referred to as a single-face corrugated sheet heating roller) and a heating roller  33  for the bottom liner board A (hereinafter, referred to as a bottom liner board heating roller). The single-face corrugated sheet heating roller  32  includes a wound-amount adjuster. Steam is supplied into the single-face corrugated sheet heating roller  32 , so that the single-face corrugated sheet heating roller  32  is heated to a predetermined temperature. Accordingly, when the top liner board C of the single-face corrugated cardboard sheet D is wound on the peripheral surface of the single-face corrugated sheet heating roller  32 , the single-face corrugated cardboard sheet D can be preheated. Likewise, the bottom liner board heating roller  33  includes a wound-amount adjuster. Steam is supplied into the bottom liner board heating roller  33 , so that the bottom liner board heating roller  33  is heated to a predetermined temperature. Accordingly, when the bottom liner board A is wound on the peripheral surface of the bottom liner board heating roller  33 , the bottom liner board A can be preheated. 
     The glue machine  19  includes an adhesive application device and a pressing device. When the single-face corrugated cardboard sheet D heated by the single-face corrugated sheet heating roller  32  is guided in the glue machine  19  and passes between a rider roller and the adhesive application roller, an adhesive is applied to an apex portion of each corrugated portion of the corrugating medium B. 
     The single-face corrugated cardboard sheet D to which the adhesive has been applied by the glue machine  19  is transferred to the double facer  20  of the next step. Further, the bottom liner board A heated by the bottom liner board heating roller  33  is also transferred to the double facer  20  through the glue machine  19 . 
     The double facer  20  is divided into an upstream heating section  20   a  and a downstream cooling section  20   b  along a traveling line of the single-face corrugated cardboard sheet D and the bottom liner board A. The single-face corrugated cardboard sheet D to which an adhesive has been applied by the glue machine  19  is conveyed into a gap between a pressing belt  34  and a hot plate  35  in the heating section  20   a , and the bottom liner board A is conveyed into a gap between the pressing belt  34  and the hot plate  35  so as to overlap the corrugating medium B of the single-face corrugated cardboard sheet D. 
     Furthermore, after the single-face corrugated cardboard sheet D and the bottom liner board A are conveyed into the gap between the pressing belt  34  and the hot plate  35 , the single-face corrugated cardboard sheet D and the bottom liner board A are integrated with each other and transferred to the cooling section  20   b  while overlapping each other in a vertical direction. When the single-face corrugated cardboard sheet D and the bottom liner board A are heated while being pressed during the transfer thereof, the single-face corrugated cardboard sheet D and the bottom liner board A are glued to each other and form a double-face corrugated cardboard sheet E. When the double-face corrugated cardboard sheet E is conveyed while being held between the pressing belt  34  and a conveying belt  36 , the double-face corrugated cardboard sheet E is naturally cooled in the cooling section  20   b.    
     The double-face corrugated cardboard sheet E manufactured by the double facer  20  is transferred to the rotary shears  21 . The rotary shears  21  cut the entire double-face corrugated cardboard sheet E or partially cut the double-face corrugated cardboard sheet E in a width direction. The slitter scorer  22  cuts out the wide double-face corrugated cardboard sheet E so that the double-face corrugated cardboard sheet E has a predetermined width in the conveying direction, and forms ruled lines extending in the conveying direction. The slitter scorer  22  includes a first slitter scorer unit  22   a  and a second slitter scorer unit  22   b  that are arranged along the conveying direction of the double-face corrugated cardboard sheet E and have substantially the same structure. Each of the first and second slitter scorer units  22   a  and  22   b  includes a plurality of sets of upper and lower ruled line rollers that are disposed so as to face each other with the double-face corrugated cardboard sheet E interposed therebetween and are arranged in the width direction, and includes a plurality of sets of slitter knives that are disposed below the double-face corrugated cardboard sheet E and are arranged in the width direction. 
     The cutoff  23  cuts the double-face corrugated cardboard sheet E, which is cut out in the conveying direction by the slitter scorer  22 , in the width direction to form the double-face corrugated cardboard sheet E in the form of a sheet. The cutoff  23  receives two double-face corrugated cardboard sheets E, which are cut into a predetermined width in the conveying direction by the slitter scorer  22 , in upper and lower (two) stages and processes the two double-face corrugated cardboard sheets E. Both the slitter scorer  22  and the cutoff  23  have substantially the same structure. The stacker  24  stacks the double-face corrugated cardboard sheets E, which are cut by the cutoff  23 , and discharges the stacked double-face corrugated cardboard sheets to the outside of the machine as a product. 
     A web adhesive application device of this embodiment will be described here. The web adhesive application device of this embodiment is provided in the above-mentioned glue machine  19 , and supplies adhesive liquid to apex portions of corrugated portions of the corrugating medium B of the single-face corrugated cardboard sheet D as a web. 
       FIG. 2  is a schematic view showing the web adhesive application device of this embodiment,  FIG. 3  is a plan view showing main parts of the glue machine,  FIG. 4  is a front view showing a scraping member and a damming member,  FIG. 5  is a plan view showing the scraping member and the damming member,  FIG. 6  is a schematic view showing a state in which the scraping member and the damming member are mounted,  FIG. 7  is a schematic view showing the disposition of the scraping members and the damming members on the adhesive application roller,  FIG. 8A  is a schematic view showing an adhesive application region W of the single-face corrugated cardboard sheet D,  FIG. 8B  is a schematic view showing the adhesive application region W of the single-face corrugated cardboard sheet D that is shifted in the width direction,  FIG. 8C  is a schematic view showing an adhesive application region W of a narrow single-face corrugated cardboard sheet D,  FIG. 8D  is a schematic view showing an adhesive application region W of a wide single-face corrugated cardboard sheet D, and  FIG. 9  is a schematic view showing a circulation path of adhesive liquid in the glue machine. 
     In this embodiment, as shown in  FIGS. 2 and 3 , the adhesive application device  41  includes an adhesive liquid tank  42 , an adhesive application roller  43 , a doctor roller  44 , scraping members  45 , damming members  46 , and a rider roller  47 . 
     The adhesive application roller  43  is a roller having a columnar shape, and each end portion of the adhesive application roller  43  in an axial direction is rotatably supported on a device frame  52  by a bearing  51 . The doctor roller  44  is a roller having a columnar shape, each end portion of the doctor roller  44  in an axial direction is rotatably supported on the device frame  52  by a bearing (not shown), and a nip portion having a predetermined clearance is secured between the adhesive application roller  43  and the doctor roller  44 . Each end portion of the rider roller  47  in an axial direction is rotatably supported on the device frame  52  by a bearing (not shown), and the single-face corrugated cardboard sheet D is conveyed between the adhesive application roller  43  and the rider roller  47 . Meanwhile, the doctor roller  44  and the rider roller  47  are supported so as to be capable of approaching and being separated from the adhesive application roller  43 , and the size of the nip portion can be adjusted between the adhesive application roller  43  and the doctor roller  44  and between the adhesive application roller  43  and the rider roller  47 . 
     The adhesive application roller  43  can be rotationally driven in a clockwise direction in  FIG. 2  by a drive unit (not shown), the doctor roller  44  can be rotationally driven in a clockwise direction in  FIG. 2 , and the rider roller  47  is rotatable in the counterclockwise direction in  FIG. 2 . In this case, the adhesive application roller  43  is rotationally driven in synchronization with the conveying speed of the single-face corrugated cardboard sheet D. The single-face corrugated cardboard sheet D is wound on the rider roller  47  over a predetermined angle range, so that the rider roller  47  is rotated by the single-face corrugated cardboard sheet D. 
     Meanwhile, the adhesive application roller  43  is formed of a metal roller of which the surface has an uneven shape and is subjected to chrome plating so that adhesive liquid is easily applied to the adhesive application roller  43 . Further, each of the doctor roller  44  and the rider roller  47  is formed of a metal roller of which the surface has a flat shape and is subjected to chrome plating. In this case, each of the rollers  43 ,  44 , and  47  may be made of stainless steel. 
     An upper portion of the adhesive liquid tank  42  is open, the adhesive liquid tank  42  can store adhesive liquid, and a part of the adhesive application roller  43  comes into contact with the adhesive liquid tank  42  so that adhesive liquid can be applied to the surface of the adhesive application roller  43 . As shown in  FIGS. 7 and 9 , the adhesive liquid tank  42  includes a bottom plate  53 , a pair of side plates  54 , and a regulating plate  55 , and the adhesive application roller  43  is disposed at one end portion of the bottom plate  53 . 
     The width of the bottom plate  53  is set to be smaller than the width of the adhesive application roller  43 , and a seal plate  56  is fixed to one end portion of the bottom plate  53 . The seal plate  56  is disposed so that a predetermined clearance is formed between the seal plate  56  and the surface of the adhesive application roller  43 . Further, the side plates  54  are fixed to both side portions of the bottom plate  53 , and a seal member  57  is mounted on one end portion of each side plate  54 . The seal member  57  is supported so as to be pressed against the surface of the adhesive application roller  43  by a biasing member (spring) (not shown). For this reason, a width where adhesive liquid is applied to the adhesive application roller  43  is set by the bottom plate  53  and the side plates  54 . The regulating plate  55  is fixed to the other end portions of the bottom plate  53  and the side plates  54 , and is set to be lower than the bottom plate  53  and the side plates  54 . Accordingly, when the amount of adhesive liquid is increased, the adhesive liquid overflows the regulating plate  55 . As a result, the amount of adhesive liquid stored in the adhesive liquid tank  42  can be maintained constant. 
     Furthermore, a storage pan  58  is disposed below the adhesive liquid tank  42 . The seal plate  56  of the bottom plate  53  of the adhesive liquid tank  42  is disposed so that a predetermined clearance is formed between the seal plate  56  and the surface of the adhesive application roller  43 , and the seal members  57  of the side plate  54  are pressed against the surface of the adhesive application roller  43 . Accordingly, when the adhesive application roller  43  is rotated, the leakage of the adhesive liquid of the adhesive liquid tank  42  from the predetermined clearance between the seal plate  56  and the adhesive application roller  43 , which is caused by the rotational force of the adhesive application roller  43 , does not occur. Meanwhile, when the adhesive application roller  43  stops, the adhesive liquid of the adhesive liquid tank  42  leaks from the predetermined clearance between the seal plate  56  and the adhesive application roller  43  and is stored in the storage pan  58 . 
     Returning to  FIGS. 2 and 3 , the adhesive application roller  43  and the doctor roller  44  are disposed so that the rotation axes of the adhesive application roller  43  and the doctor roller  44  are parallel to each other, but the rotational directions of the adhesive application roller  43  and the doctor roller  44  are opposite to each other at the nip portion. Accordingly, a predetermined clearance is secured at the nip portion between the adhesive application roller  43  and the doctor roller  44 . For this reason, the doctor roller  44  can adjust the thickness of the adhesive liquid to a predetermined thickness by scraping the adhesive liquid that is applied to the adhesive application roller  43 . Further, the adhesive application roller  43  and the rider roller  47  are disposed so that the rotation axes of the adhesive application roller  43  and the rider roller  47  are parallel to each other, and the rotational directions of the adhesive application roller  43  and the rider roller  47  are the same as each other at the nip portion. It is possible to convey the single-face corrugated cardboard sheet D, which passes between the adhesive application roller  43  and the doctor roller  44 , in a direction indicated by an arrow and to apply adhesive liquid to apex portions of corrugated portions of the single-face corrugated cardboard sheet D. 
     In this case, since the doctor roller  44  adjusts the thickness of the adhesive liquid to a set thickness by scraping the adhesive liquid that is applied to the adhesive application roller  43 , the adhesive application roller  43  can apply the amount of adhesive liquid, which corresponds to the adjusted predetermined thickness, to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet D. 
     A guide rail  59 , which is parallel to the respective rollers  43 ,  44 , and  47 , is disposed at the doctor roller  44  of the adhesive application roller  43 , and each longitudinal end portion of the guide rail  59  is fixed to the device frame  52 . A moving plate (moving member)  60  is disposed above the guide rail  59  along a direction orthogonal to the guide rail  59 , and a slide  62  is fixed to a base end portion of the moving plate  60  through a bracket  61 . The slide  62  is supported so as to be movable along the guide rail  59 . Furthermore, a drive motor  63  is fixed to the device frame  52 , and a screw shaft  65  connected to a drive shaft  64  is threadedly engaged with the slide  62 . Accordingly, when the drive motor  63  is driven, the screw shaft  65  is rotated by the drive shaft  64  and the moving plate  60  can be moved along the guide rail  59  by the slide  62  with which the drive shaft  64  is threadedly engaged. 
     A support arm (support member)  66  extends from the moving plate  60  toward the adhesive application roller  43 , a base end portion of the support arm  66  is fixed to the moving plate  60  by a fastening bolt  67 , and the scraping members  45  and the damming members  46  are mounted at the tip portion of the support arm  66 . In this case, the support arm  66  can be positioned relative to the moving plate  60  by three support faces along the directions that cross each other. That is, as shown in  FIGS. 4 and 5 , the lower surface of a base end portion-side mounting portion  66   a  is placed on a placement surface  60   a  that is formed at the tip portion of the moving plate  60 , so that the support arm  66  is positioned in a vertical direction. Further, a base end portion-side stepped portion  66   b  comes into contact with an end face  60   b  that is formed at the tip portion of the moving plate  60 , so that the support arm  66  is positioned in the longitudinal direction (a direction where the support arm  66  approaches and is separated from the adhesive application roller  43 ). Furthermore, left and right side surfaces of the base end portion-side mounting portion  66   a  come into contact with vertical wall surfaces  60   c  formed at the tip portion of the moving plate  60 , so that the support arm  66  is positioned in the width direction (an axial direction of the adhesive application roller  43 ). 
     Further, returning to  FIGS. 2 and 3 , since the scraping member  45  and the damming member  46  are supported by the same support arm  66 , the scraping member  45  and the damming member  46  can be easily positioned relative to the adhesive application roller  43  and can be integrally moved in the axial direction of the adhesive application roller  43 . Accordingly, the positions of the scraping member  45  and the damming member  46  can be easily adjusted. That is, the positions of the scraping member  45  and the damming member  46  need to be adjusted according to the width of the bottom liner board A that is glued to the single-face corrugated cardboard sheet D, and the adjustment of the positions of the scraping member  45  and the damming member  46  can be easily performed. 
     As shown in  FIGS. 4 to 7 , the scraping member  45  scrapes off adhesive liquid, which is applied to the single-face corrugated cardboard sheet D outside an adhesive application region, by coming into pressure contact with the surface of the adhesive application roller  43  on the upstream side of the nip portion between the adhesive application roller  43  and the doctor roller  44  in the rotational direction. Furthermore, the damming member  46  dams the adhesive liquid, which is extruded from the adhesive application region of the single-face corrugated cardboard sheet D, by coming into contact with the surface of the doctor roller  44  on the upstream side of the nip portion between the adhesive application roller  43  and the doctor roller  44  in the rotational direction and on the downstream side of the contact position of the scraping member  45  in the rotational direction. 
     That is, when the single-face corrugated cardboard sheet D is conveyed relative to the adhesive application roller  43 , the adhesive application region W of the single-face corrugated cardboard sheet D is adjusted according to the width of the bottom liner board A that is glued to the single-face corrugated cardboard sheet D by the double facer  20  provided on the downstream side. Specifically, the width of the adhesive application region W of the single-face corrugated cardboard sheet D is adjusted so as to be smaller than the width of the bottom liner board A. Here, the width of the single-face corrugated cardboard sheet D and the width of the bottom liner board A are set to be equal to each other. For this reason, the damming members  46  are disposed in regions positioned near the left and right ends of the single-face corrugated cardboard sheet D and the bottom liner board A that are being conveyed. Further, the scraping members  45  are also disposed in regions positioned near the left and right ends of the single-face corrugated cardboard sheet D and the bottom liner board A that are being conveyed. 
     In this embodiment, inner end faces  46   a  of the left and right damming members  46  are set to positions that are spaced inward from the respective end portions Da and Aa of the single-face corrugated cardboard sheet D and the bottom liner board A by a predetermined length, and inner end faces  45   a  of the scraping members  45  are set to positions that are spaced inward from the respective end portions Da and Aa of the single-face corrugated cardboard sheet D and the bottom liner board A by a predetermined length. However, the positions of the inner end faces  45   a  of the scraping members  45  may be positioned inside the inner end faces  46   a  of the damming members  46 . 
     Here, the adhesive application region W of the single-face corrugated cardboard sheet D will be described in detail. As described above, the corrugating machine  10  manufactures the single-face corrugated cardboard sheet D by gluing the top liner board C to the corrugating medium B and manufactures the double-face corrugated cardboard sheet E by gluing the bottom liner board A to the single-face corrugated cardboard sheet D as shown in  FIG. 8A . In this case, the single-face corrugated cardboard sheet D and the bottom liner board A are generally set to have the same width. In regard to the single-face corrugated cardboard sheet D and the bottom liner board A set as described above, the width of the adhesive application region W of the single-face corrugated cardboard sheet D to which an adhesive is applied by the adhesive application roller  43 , that is, the damming width of the adhesive application roller  43  where the adhesive is dammed by the two damming members  46  is set to be smaller than the width of the bottom liner board A. 
     When the bottom liner board A is glued to the single-face corrugated cardboard sheet D and the bottom liner board A and the single-face corrugated cardboard sheet D are conveyed on the hot plate  35  of the heating section  20   a  in this state, adhesive liquid P is dried. When the adhesive liquid P is applied outside the adhesive application region W at this time, the adhesive liquid P is extruded from the end portions of the bottom liner board A in the width direction and the adhesive liquid P is applied to the hot plate  35  and solidified. Since the damming width of the adhesive application roller  43  (the adhesive application region W of the single-face corrugated cardboard sheet D) is set by the two damming members  46  in this embodiment, the extrusion of the adhesive liquid P from the bottom liner board A is prevented. 
     Further, the single-face corrugated cardboard sheet D and the bottom liner board A are set to have the same width as shown in  FIG. 8B . However, when the width of the adhesive application region W of the single-face corrugated cardboard sheet D to which the adhesive is applied by the adhesive application roller  43 , that is, the damming width of the adhesive application roller  43  where the adhesive is dammed by the two damming members  46  is set to be smaller than the width of the bottom liner board A even if the single-face corrugated cardboard sheet D and the bottom liner board A are conveyed while being shifted relative to each other in the width direction, the extrusion of the adhesive liquid P from the bottom liner board A is prevented. 
     Furthermore, when a double-face corrugated cardboard sheet E is changed to a double-face corrugated cardboard sheet E having a different width during the manufacture of the double-face corrugated cardboard sheet E, any one of the single-face corrugated cardboard sheet D (the corrugating medium B and the top liner board C) and the bottom liner board A may be used without change to manufacture the double-face corrugated cardboard sheet E in a case in which the number of double-face corrugated cardboard sheets to be manufactured is small. In this case, the width of the bottom liner board A is larger than the width of the single-face corrugated cardboard sheet D as shown in  FIG. 8C . Even in this case, when the width of the adhesive application region W of the single-face corrugated cardboard sheet D to which the adhesive is applied by the adhesive application roller  43 , that is, the damming width of the adhesive application roller  43  where the adhesive is dammed by the two damming members  46  is set to be smaller than the width of the bottom liner board A, the extrusion of the adhesive liquid P from the bottom liner board A is prevented. 
     Conversely, even if the width of the bottom liner board A is smaller than the width of the single-face corrugated cardboard sheet D as shown in  FIG. 8D , the extrusion of the adhesive liquid P from the bottom liner board A is prevented when the width of the adhesive application region W of the single-face corrugated cardboard sheet D to which the adhesive is applied by the adhesive application roller  43 , that is, the damming width of the adhesive application roller  43  where the adhesive is dammed by the two damming members  46  is set to be smaller than the width of the bottom liner board A. 
     The damming member  46  is formed in the shape of a block, and includes a first curved contact surface  71  that is provided at the tip portion thereof, has a predetermined width in the axial direction of the adhesive application roller  43 , has a predetermined length in the circumferential direction of the adhesive application roller  43 , and comes into surface contact with the surface of the adhesive application roller  43 . The first curved contact surface  71  is set to have substantially the same radius of curvature as the surface of the adhesive application roller  43 , and extends to a nip portion N between the adhesive application roller  43  and the doctor roller  44 . 
     Further, the damming member  46  includes a second curved contact surface  72  that is provided at the tip portion thereof, has a predetermined width in the axial direction of the doctor roller  44 , has a predetermined length in the circumferential direction of the doctor roller  44 , and comes into surface contact with the surface of the doctor roller  44 . The second curved contact surface  72  is set to have substantially the same radius of curvature as the surface of the doctor roller  44 , and extends to a nip portion N between the adhesive application roller  43  and the doctor roller  44 . 
     For this reason, since the first curved contact surface  71  is formed at a portion of the damming member  46  facing the adhesive application roller  43  and the second curved contact surface  72  is formed at a portion of the damming member  46  facing the doctor roller  44 , the tip portion of the damming member  46  is formed in a tapered shape having a predetermined width in the axial direction of each of the rollers  43  and  44 . In this case, the first and second curved contact surfaces  71  and  72  have the same width. Meanwhile, a tip, which has a tapered shape, of the damming member  46  extends to the nip portion N between the adhesive application roller  43  and the doctor roller  44 , but ends in front of the nip portion N in manufacturing. Accordingly, a clearance is secured between the nip portion N and the tip of the damming member  46 . 
     Further, the damming member  46  is made of, for example, MC nylon (a trade name of Quadrant Polypenco Japan Ltd) as polyamide synthetic fiber. Meanwhile, the damming member  46  is not limited to the MC nylon, and may be made of a resin such as a high-molecular compound (plastic, elastomer, or urethane). In this case, the entire damming member  46  does not need to be made of a resin, and a resin layer (a fluorine resin layer or the like) may be formed on the contact surfaces (the first and second curved contact surfaces  71  and  72 ) that come into contact with the adhesive application roller  43  and the doctor roller  44 . That is, when the adhesive application roller  43  or the doctor roller  44  is made of metal and the damming member  46  is made of a resin, the wear of the surface of the adhesive application roller  43  or the doctor roller  44  is prevented. 
     Furthermore, the damming member  46  includes a narrow mounting portion  74  that is formed at a body portion  73  where the first and second curved contact surfaces  71  and  72  are formed at the base end portion, and is formed integrally with a pair of restricted portions  75  that protrude upward and downward in a height direction. Meanwhile, a pair of locking portions  81  are formed at upper and lower portions of the tip portion of the support arm  66 , and the support arm  66  includes an accommodation opening  82  that passes therethrough in a horizontal direction. The mounting portion  74  of the damming member  46  is positioned between the upper and lower locking portions  81 , the pair of restricted portions  75  are positioned in the accommodation opening  82 , and compression coil springs (biasing members)  84  are provided between two recesses  76  formed at the mounting portion  74  and two recesses  83  formed at the accommodation opening  82 . Moreover, while the base end portion of the damming member  46  is supported by the tip portion of the support arm  66 , a pair of (left and right) fixing plates  85  are disposed at the tip portion of the support arm  66  and are fixed by a plurality of bolts  86 . 
     In this case, the damming member  46  is supported so as to be slidable in a direction which is orthogonal to the axial directions of the adhesive application roller  43  and the doctor roller  44  and in which the damming member  46  is adjacent to the adhesive application roller  43  and the doctor roller  44 . That is, the restricted portions  75  of the damming member  46  are restricted in the accommodation opening  82 , but the first and second curved contact surfaces  71  and  72  are supported so as to be movable by a predetermined distance in a direction in which the first and second curved contact surfaces  71  and  72  approach and are separated from the surfaces of the adhesive application roller  43  and the doctor roller  44 . Further, the damming member  46  is biased in a direction, in which the first and second curved contact surfaces  71  and  72  are pressed against the surfaces of the adhesive application roller  43  and the doctor roller  44 , by a biasing force of the compression coil spring  84 . Furthermore, the damming member  46  is supported by the pair of (left and right) fixing plates  85  so as not to oscillate in the width direction, that is, in the axial direction of each of the rollers  43  and  44 . Moreover, since two compression coil springs  84  are arranged in parallel between the damming member  46  and the support arm  66  in the vertical direction, the tip portions (the first and second curved contact surfaces  71  and  72 ) can oscillate about the base end portion (the mounting portion  74 ) as a fulcrum in the vertical direction, that is, in a direction of an arrow R of  FIG. 4  toward the surface of the adhesive application roller  43  or the surface of the doctor roller  44 . 
     For this reason, the damming member  46  is supported so that the first curved contact surface  71  is pressed against the surface of the adhesive application roller  43  and the second curved contact surface  72  is pressed against the surface of the doctor roller  44 . Further, the first and second curved contact surfaces  71  and  72  of the damming member  46  oscillate relative to the surfaces of the adhesive application roller  43  and the doctor roller  44 , so that the first and second curved contact surfaces  71  and  72  come into close contact with the surfaces of the adhesive application roller  43  and the doctor roller  44 . 
     Furthermore, a mounting surface  91  is formed at a lower portion of the body portion  73 , that is, a portion of the body portion  73  below the first curved contact surface  71 . A base end portion of the scraping member  45  comes into close contact with the mounting surface  91  and an end portion thereof comes into close contact with a stepped portion  92 , so that the damming member  46  is positioned. Moreover, while the base end portion of the scraping member  45  is interposed between the mounting surface  91  and a pressing member  93 , a fixing bolt  94  passes through the pressing member  93 , the scraping member  45 , and the damming member  46  from below and is threadedly engaged with a nut  95 . Accordingly, the scraping member  45  is fixed to the damming member  46 . 
     The scraping member  45  has the shape of a flat plate, and has a predetermined width in the axial direction of the adhesive application roller  43 . Further, since the scraping member  45  is made of a resin such as urethane (or plastic or elastomer), the scraping member  45  can be elastically deformed. Accordingly, while the scraping member  45  is fixed to the damming member  46 , the tip portion of the scraping member  45  is pressed against the surface of the adhesive application roller  43 . In this case, since the scraping member  45  comes into contact with the surface of the adhesive application roller  43  while having an angle θ of attack relative to a tangent to the adhesive application roller  43 , substantially all of an adhesive film applied to the adhesive application roller  43  can be scraped off. Meanwhile, it is preferable that the angle θ of attack satisfies “30°≦θ≦60°”, and it is possible to appropriately remove the adhesive film of the adhesive application roller  43  by setting the angle θ of attack to this range. 
     Further, an opening  77  formed along the width direction is formed at the damming member  46  on the downstream side of the scraping member  45  in the rotational direction of the adhesive application roller  43 , that is, between the scraping member  45  and the first curved contact surface  71 , so that a deformation region of the damming member  46  is secured. 
     Incidentally, as shown in  FIG. 9 , the adhesive application device  41  is provided with a circulation path for allowing adhesive liquid, which falls down from a predetermined clearance between the adhesive application roller  43  and the bottom plate  53 , and adhesive liquid, which overflows the regulating plate  55 , to be filtered and to return to the adhesive liquid tank  42 . That is, since the storage pan  58  is disposed below the adhesive liquid tank  42 , adhesive liquid falling down from a predetermined clearance between the adhesive application roller  43  and the bottom plate  53  is stored in the storage pan  58 . The storage pan  58  is provided with a discharge port  101 , and is connected to a primary tank  104  through a first discharge path  103  that includes a filter  102 . Further, the adhesive liquid tank  42  includes a discharge port  105  that is formed at a position where adhesive liquid overflows the regulating plate  55 , and is connected to the primary tank  104  through a second discharge path  107  that includes a filter  106 . 
     The primary tank  104  is connected to a storage tank  110  through a connection path  109  that includes a pump  108 . Furthermore, the storage tank  110  is connected to a supply port  114  of the adhesive liquid tank  42  through a supply path  113  that includes a filter  111  and a pump  112 . In this case, the first discharge path  103 , the second discharge path  107 , the connection path  109 , the supply path  113 , and the like form the circulation path. 
     In this case, the pump  112  supplies a predetermined amount of adhesive liquid of the storage tank  110  to the adhesive liquid tank  42  through the supply path  113 . That is, since the adhesive application roller  43  supplies adhesive liquid of which the amount is slightly larger than the amount of adhesive liquid to be scraped off, the adhesive liquid of the adhesive liquid tank  42  is made to always overflow the regulating plate  55 . Accordingly, a constant amount of adhesive liquid is stored in the adhesive liquid tank  42 . 
     Here, a method of applying an adhesive to the single-face corrugated cardboard sheet D by the adhesive application device  41  of this embodiment will be described. 
     The method of applying an adhesive by the adhesive application device  41  of this embodiment includes: a step of applying adhesive liquid to the surface of the adhesive application roller  43  through the rotation of the adhesive application roller  43 ; a step of scraping off the adhesive liquid, which is applied to the single-face corrugated cardboard sheet D outside the adhesive application region W, by making the scraping members  45  come into pressure contact with the surface of the adhesive application roller  43 ; a step of damming adhesive liquid, which is extruded from the adhesive application region W, by making the damming members  46  come into contact with the surface of the adhesive application roller  43 ; a step of adjusting the thickness of the adhesive liquid, which is applied to the adhesive application region W of the adhesive application roller  43 , to a preset thickness by the doctor roller  44 ; and a step of transferring the adhesive liquid, which is applied to the surface of the adhesive application roller  43 , to the single-face corrugated cardboard sheet D. 
     That is, as shown in  FIGS. 2 and 4 , the adhesive application roller  43  is rotationally driven in the clockwise direction in  FIG. 2  and the doctor roller  44  is rotationally driven in the clockwise direction in  FIG. 2  by the drive unit. At this time, the single-face corrugated cardboard sheet D is fed between the adhesive application roller  43  and the rider roller  47 , so that the rider roller  47  is rotated in the counterclockwise direction in  FIG. 2 . 
     When the adhesive application roller  43  is rotated at this time, adhesive liquid stored in the adhesive liquid tank  42  is applied to the surface of the adhesive application roller  43 . When the adhesive application roller  43  is further rotated, first, the scraping members  45  scrape off the adhesive liquid that is applied to the single-face corrugated cardboard sheet D outside the adhesive application region W since coming into pressure contact with the surface of the adhesive application roller  43  at the end portions of the adhesive application roller  43  in the axial direction. After that, when the adhesive application roller  43  is further rotated, the damming members  46  dam the adhesive liquid that is extruded from the adhesive application region W since coming into contact with the surface of the adhesive application roller  43  at the end portions of the adhesive application roller  43  in the axial direction. In this case, the damming members  46  prevent the adhesive liquid of the adhesive application region W, which is applied to the surface of the adhesive application roller  43 , from being extruded to the outside of the adhesive application region W at the end portions of the adhesive application roller  43  in the axial direction, to the nip portion between the adhesive application roller  43  and the doctor roller  44 . 
     Meanwhile, at this time, the width of the adhesive application region W of the single-face corrugated cardboard sheet D to which the adhesive is applied by the adhesive application roller  43 , that is, the damming width of the adhesive application roller  43  where the adhesive is dammed by the two damming members  46  is set to be smaller than the width of the bottom liner board A according to the width of the bottom liner board A. As shown in  FIGS. 1 and 3 , the glue machine  19  is provided with a sensor  19   a  that detects the width of the bottom liner board A to be conveyed, and the sensor  19   a  outputs the detected width of the bottom liner board A to a controller  37 . Then, the controller  37  moves the scraping members  45  and the damming members  46  to predetermined positions through the support arms  66  by driving the drive motor  63  according to the width of the bottom liner board A and moving the moving plate  60 . These predetermined positions are positions where the width of the adhesive application region W of the single-face corrugated cardboard sheet D is set to be smaller than the width of the bottom liner board A as described above. 
     In this case, the corrugating machine is adapted so that the glue machine  19  is provided with the sensor  19   a  detecting the width of the bottom liner board A and the controller  37  moves the scraping members  45  and the damming members  46  to predetermined positions according to the width of the bottom liner board A, but the corrugating machine is not limited to this structure. For example, since a production management device has various data that includes not only the width of the bottom liner board A but also the width of the corrugating medium B or the top liner board C, the corrugating machine may be adapted so that the production management device moves the scraping members  45  and the damming members  46  to predetermined positions according to the width of the bottom liner board A. 
     Further, the doctor roller  44  adjusts the thickness of the adhesive liquid, which is applied to the adhesive application region W of the adhesive application roller  43 , to a preset thickness at the nip portion between the adhesive application roller  43  and the doctor roller  44 . After that, the adhesive liquid, which is applied to the surface of the adhesive application roller  43 , is transferred to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet D at a nip portion between the adhesive application roller  43  and the rider roller  47 . 
     As described above, the web adhesive application device of this embodiment includes: the adhesive liquid tank  42  that can store adhesive liquid; the adhesive application roller  43  that allows the adhesive liquid of the adhesive liquid tank  42  to be applied to a surface thereof and can transfer the adhesive liquid to the adhesive application region W adjusted according to the width of the bottom liner board A to be glued to the single-face corrugated cardboard sheet D; the doctor roller  44  that can adjust the thickness of the adhesive liquid applied to the adhesive application roller  43  to a set thickness; the scraping members  45  that scrape off the adhesive liquid, which is applied outside the adhesive application region W, by coming into pressure contact with the surface of the adhesive application roller  43  on the upstream side of the nip portion between the adhesive application roller  43  and the doctor roller  44  in the rotational direction; and the damming members  46  that dam the adhesive liquid, which is extruded from the adhesive application region W, by coming into contact with the surface of the adhesive application roller  43  on the upstream side of the nip portion between the adhesive application roller  43  and the doctor roller  44  in the rotational direction and on the downstream side of the contact positions of the scraping members  45  in the rotational direction. 
     Accordingly, when the adhesive liquid of the adhesive liquid tank  42  is applied to the surface of the adhesive application roller  43  through the rotation of the adhesive application roller  43 , first, the scraping members  45  scrape off the adhesive liquid, which is applied outside the adhesive application region W, by coming into pressure contact with the surface of the adhesive application roller  43 , the damming members  46  then dam the adhesive liquid, which is extruded from the adhesive application region W, by coming into contact with the surface of the adhesive application roller  43 , and the doctor roller  44  transfers the adhesive liquid, which is applied to the surface of the adhesive application roller  43 , to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet D after adjusting the thickness of the adhesive liquid, which is applied to the adhesive application region W of the adhesive application roller  43 , to a set thickness. 
     That is, after the scraping members  45  scrape off the adhesive liquid, which is applied to the adhesive application roller  43  outside the adhesive application region W, the damming members  46  dam the adhesive liquid that is extruded from the adhesive application region W. Accordingly, the extrusion of the adhesive liquid from the adhesive application region W to the end portions of the adhesive application roller  43  in the axial direction is prevented, so that the adhesive liquid is appropriately applied to the single-face corrugated cardboard sheet D by the adhesive application roller  43 . For this reason, when the single-face corrugated cardboard sheet D and the bottom liner board A are sent to the double facer  20  and travel on the hot plate  35 , the extrusion of the adhesive liquid from the end portions of the bottom liner board A in the width direction, the application of the adhesive liquid to the hot plate  35 , and the solidification of the adhesive liquid on the hot plate  35  can be prevented. 
     In the web adhesive application device of this embodiment, the damming member  46  includes the first curved contact surface  71  that has a predetermined width in the axial direction of the adhesive application roller  43 , has a predetermined length in the circumferential direction of the adhesive application roller  43 , and comes into contact with the surface of the adhesive application roller  43 , and the first curved contact surface  71  extends to the nip portion between the adhesive application roller  43  and the doctor roller  44 . Accordingly, since the first curved contact surface  71  can dam the adhesive liquid, which is applied to the adhesive application region W, in a region to the nip portion between the adhesive application roller  43  and the doctor roller  44 , it is possible to prevent the adhesive liquid from being extruded from the adhesive application region W when the thickness of the adhesive liquid is adjusted to a set thickness by the doctor roller  44 . 
     In the web adhesive application device of this embodiment, the damming member  46  is provided with the second curved contact surface  72  that comes into contact with the surface of the doctor roller  44 , and the second curved contact surface  72  extends to the nip portion between the adhesive application roller  43  and the doctor roller  44 . Accordingly, the first curved contact surface  71  dams the adhesive liquid, which is applied to the adhesive application region W to the nip portion between the adhesive application roller  43  and the doctor roller  44 , and the second curved contact surface  72  can prevent the adhesive liquid from being extruded from the adhesive application roller  43  to the doctor roller  44  when the doctor roller  44  adjusts the thickness of the adhesive liquid to a set thickness. 
     In the web adhesive application device of this embodiment, the scraping member  45  can be elastically deformed and the opening  77  is formed between the scraping member  45  and the damming member  46 , so that the deformation region is secured. Accordingly, when the scraping member  45  scrapes off the adhesive liquid applied outside the adhesive application region W by coming into pressure contact with the surface of the adhesive application roller  43 , the scraping member  45  is elastically deformed. However, since the opening (deformation region)  77  is formed at the damming member  46 , the scraping member  45  enters the opening  77  and can appropriately scrape off the adhesive liquid, which is applied to the surface of the adhesive application roller  43 , without coming into contact with the damming member  46 . 
     In the web adhesive application device of this embodiment, the damming member  46  is supported so as to be pressed against the surface of the adhesive application roller  43 . Accordingly, since the damming member  46  can come into close contact with the surface of the adhesive application roller  43  without a clearance, the damming member  46  can prevent the adhesive liquid from being extruded from the adhesive application region W. Further, even if the contact surface of the damming member  46  coming into contact with the adhesive application roller  43  is worn out, the damming member  46  can always come into close contact with the surface of the adhesive application roller  43 . Accordingly, the damming member  46  can prevent the adhesive liquid from being extruded from the adhesive application region W for a long period of time. 
     In this case, two compression coil springs  84 , which press the damming member  46  against the surface of the adhesive application roller  43 , are provided. Accordingly, the damming member  46  can stably come into close contact with the surface of the adhesive application roller  43 , so that the damming member  46  can prevent the adhesive liquid from being extruded from the adhesive application region W. 
     Furthermore, the damming member  46  is supported so as to be slidable in a direction which is orthogonal to the axial directions of the adhesive application roller  43  and the doctor roller  44  and in which the damming member  46  is adjacent to both the rollers  43  and  44 . Accordingly, it is possible to make the damming member  46  appropriately come into contact with the surface of the adhesive application roller  43  regardless of a state in which the damming member  46 , the adhesive application roller  43 , or the like is mounted. 
     In the web adhesive application device of this embodiment, one end portion of the damming member  46  in the width direction corresponds to an end portion of the adhesive application region W in the width direction and one end portion of the scraping member  45  corresponds to an end portion of the adhesive application region W in the width direction or extends within the adhesive application region W by a predetermined length. Accordingly, since one end portion of the damming member  46  and one end portion of the scraping member  45  correspond to the end portion of the adhesive application region W in the width direction, the scraping member  45  can appropriately scrape off the adhesive liquid that is applied outside the adhesive application region W and the damming member  46  can appropriately prevent the adhesive liquid from being extruded from the adhesive application region W. Further, when one end portion of the scraping member  45  extends within the adhesive application region W, the scraping member  45  scrapes off not only the adhesive liquid outside the adhesive application region W but also the adhesive liquid of a part of the inside of the adhesive application region W. Accordingly, even though the scraping member  45  and the damming member  46  are spaced apart from each other by a predetermined distance, the damming member  46  can appropriately prevent the adhesive liquid from being extruded from the adhesive application region W. 
     In the web adhesive application device of this embodiment, a metal layer is formed on the surface of the adhesive application roller  46  and a resin layer is formed on the contact surface of the damming member  46 . Accordingly, since the damming member  46  of which the surface is made of a resin comes into contact with the adhesive application roller  43  of which the surface is made of metal, damage to the surface of the adhesive application roller  43  is prevented. As a result, it is possible to appropriately prevent the adhesive liquid from being extruded from the adhesive application region W for a long period of time. 
     In the web adhesive application device of this embodiment, the scraping member  45  and the damming member  46  are supported by the same support arm  66 . That is, the damming member  46  is fixed to the tip portion of the support arm  66 , and the scraping member  45  is fixed to the lower portion of the damming member  46 . Accordingly, since it is possible to improve the mountability of the scraping member  45  and the damming member  46  and to adjust the positions of the scraping member  45  and the damming member  46  by only adjusting the position of the support arm  66 , it is possible to improve workability. 
     In the web adhesive application device of this embodiment, the base end portion of the support arm  66  can be positioned relative to the moving plate  60  by three support faces along the directions that cross each other. That is, the lower surface of the mounting portion  66   a  is placed on the placement surface  60   a  of the moving plate  60 , the stepped portion  66   b  comes into contact with the end face  60   b  of the moving plate  60 , and the mounting portion  66   a  comes into contact with the vertical wall surfaces  60   c , so that the support arm  66  is positioned in the three directions. Since the scraping member  45  and the damming member  46  can be easily positioned through the support arms  66 , it is possible to improve positioning accuracy and mounting workability. 
     In the web adhesive application device of this embodiment, the device frame  52  is provided with the moving plate  60  that is movable in the axial direction of the adhesive application roller  43  and the support arm  66  is supported by the moving plate  60 . Accordingly, since the positions of the scraping member  45  and the damming member  46  can be easily changed according to the width of the bottom liner board A, versatility can be improved. 
     In the web adhesive application device of this embodiment, the adhesive liquid tank  42  includes the bottom plate  53  of which one end portion is disposed with a predetermined clearance interposed between itself and the surface of the adhesive application roller  43 , the pair of side plates  54  which are connected to both side portions of the bottom plate  53  and of which each of one end portions is disposed so as to be pressed against the surface of the adhesive application roller  43 , and the regulating plate  55  that is connected to the other end portion of the bottom plate  53  and allows the stored adhesive liquid to overflow; and the storage pan  58  is disposed below the adhesive liquid tank  42 . Accordingly, it is possible to simplify the structure of the adhesive liquid tank  42  and to reduce the amount of the adhesive liquid stored in the adhesive liquid tank  42 . Therefore, it is possible to reduce operating costs. Further, since a predetermined clearance is formed between the bottom plate  53  and the adhesive application roller  43 , it is possible to prevent damage to the surface of the adhesive application roller  43 . In this case, the adhesive liquid of the adhesive liquid tank  42  flows downward from the clearance between the adhesive application roller  43  and the bottom plate  53  during the stop of the adhesive application roller  43 , but the adhesive liquid having flowed downward is stored in the storage pan  58 . Accordingly, adhesive liquid can be easily collected. 
     The web adhesive application device of this embodiment is provided with the circulation path for allowing adhesive liquid, which falls down from a predetermined clearance between the adhesive application roller  43  and the bottom plate  53 , and adhesive liquid, which overflows the regulating plate  55 , to be filtered by the filters  102  and  106  and to return to the adhesive liquid tank  42 . Accordingly, since the adhesive liquid can be easily collected and foreign substances mixed with the adhesive liquid can be easily removed, stable work for applying an adhesive can be performed. 
     Further, the method of applying an adhesive to a web of this embodiment includes: a step of applying adhesive liquid to the surface of the adhesive application roller  43  through the rotation of the adhesive application roller  43 ; a step of scraping off the adhesive liquid, which is applied to the single-face corrugated cardboard sheet D outside the adhesive application region W, by making the scraping members  45  come into pressure contact with the surface of the adhesive application roller  43 ; a step of damming adhesive liquid, which is extruded from the adhesive application region W, by making the damming members  46  come into contact with the surface of the adhesive application roller  43 ; a step of adjusting the thickness of the adhesive liquid, which is applied to the adhesive application region W of the single-face corrugated cardboard sheet D of the adhesive application roller  43 , to a preset thickness by the doctor roller  44 ; and a step of transferring the adhesive liquid, which is applied to the surface of the adhesive application roller  43 , to the single-face corrugated cardboard sheet D. 
     Accordingly, after the scraping members  45  scrape off the adhesive liquid, which is applied to the adhesive application roller  43  outside the adhesive application region W, the damming members  46  dam the adhesive liquid that is extruded from the adhesive application region W. Therefore, the extrusion of the adhesive liquid from the adhesive application region W to the end portions of the adhesive application roller  43  in the axial direction is prevented, so that the adhesive liquid is appropriately applied to the single-face corrugated cardboard sheet D by the adhesive application roller  43 . For this reason, when the single-face corrugated cardboard sheet D and the bottom liner board A are sent to the double facer  20  and travel on the hot plate  35 , the extrusion of the adhesive liquid from the end portions of the bottom liner board A in the width direction, the application of the adhesive liquid to the hot plate  35 , and the solidification of the adhesive liquid on the hot plate  35  can be prevented. 
     Further, the corrugated cardboard sheet manufacturing apparatus of this embodiment includes the single facer  15  that manufactures a single-face corrugated cardboard sheet D by gluing the top liner board C to the corrugating medium B, the glue machine  19  that applies adhesive liquid to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet D, and the double facer  20  that manufactures a double-face corrugated cardboard sheet E by gluing the bottom liner board A to the corrugating medium B side of the single-face corrugated cardboard sheet D manufactured by the single facer  15 ; and the above-mentioned adhesive application device  41  is applied to the glue machine  19 . 
     Accordingly, the single facer  15  manufactures the single-face corrugated cardboard sheet D by gluing the top liner board C to the corrugating medium B, the glue machine  19  applies adhesive liquid to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet D, and the double facer  20  manufactures the double-face corrugated cardboard sheet E by gluing the bottom liner board A to the corrugating medium B side of the single-face corrugated cardboard sheet D. At this time, in the glue machine  19 , the scraping members  45  scrape off the adhesive liquid, which is applied to the adhesive application roller  43  outside the adhesive application region W, and the damming members  46  then dam the adhesive liquid that is extruded from the adhesive application region W. Accordingly, the extrusion of the adhesive liquid from the adhesive application region W to the end portions of the adhesive application roller  43  in the axial direction is prevented, so that the adhesive liquid is appropriately applied to the single-face corrugated cardboard sheet D by the adhesive application roller  43 . For this reason, when the single-face corrugated cardboard sheet D and the bottom liner board A are sent to the double facer  20  and travel on the hot plate  35 , the extrusion of the adhesive liquid from the end portions of the bottom liner board A in the width direction, the application of the adhesive liquid to the hot plate  35 , and the solidification of the adhesive liquid on the hot plate  35  can be prevented. 
     Meanwhile, in the above-mentioned embodiment, the damming member  46  has been mounted at the tip portion of the support arm  66  and the scraping member  45  has been mounted on the damming member  46 . However, two support arms may be provided, and the damming member  46  and the scraping member  45  may be separately mounted at tip portions of different support arms. 
     Further, in the above-mentioned embodiment, the damming member  46  has been formed in the shape of a block. However, the shape of the damming member is not limited thereto and may be, for example, the shape of a plate as long as one end portion of the damming member can be positioned at the end portion of the adhesive application region of the adhesive application roller  43 . 
     Furthermore, the web adhesive application device of this embodiment has been applied to the glue machine  19  in the above-mentioned embodiment, but may be applied to the adhesive application device  15   d  of the single facer  15 . Moreover, the web adhesive application device and the method of applying an adhesive to a web of this embodiment have been used to apply an adhesive to the apex portions of the corrugated portions of the single-face corrugated cardboard sheet D (corrugating medium B), but may be used to apply an adhesive to a flat web. 
     REFERENCE SIGNS LIST 
     
         
           10 : corrugating machine (corrugated cardboard sheet manufacturing apparatus) 
           11 : mill roll stand 
           12 : preheater 
           13 : mill roll stand 
           14 : preheater 
           15 : single facer 
           16 : bridge 
           17 : mill roll stand 
           18 : preheater 
           19 : glue machine (web adhesive application device) 
           20 : double facer 
           21 : rotary shears 
           22 : slitter scorer 
           23 : cutoff 
           24 : stacker 
           41 : adhesive application device 
           42 : adhesive liquid tank 
           43 : adhesive application roller 
           44 : doctor roller 
           45 : scraping member 
           46 : damming member 
           47 : rider roller 
           60 : moving plate (moving member) 
           66 : support arm (support member) 
           71 : first curved contact surface 
           72 : second curved contact surface 
           77 : opening (deformation region) 
           84 : compression coil spring (biasing member) 
         A: bottom liner board (first liner) 
         B: corrugating medium 
         C: top liner board (second liner) 
         D: single-face corrugated cardboard sheet (web) 
         E: double-face corrugated cardboard sheet