Patent Publication Number: US-9896225-B2

Title: Packaging and filling device, paper container and blank

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation application of International Application No. PCT/JP2014/067025 filed on Jun. 26, 2014. The content of the prior application is herein incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a packaging and filling device, a paper container and a blank for use in packaging and filling liquid food, such as milk, juices, etc. in a roofed paper container. 
     BACKGROUND ART 
     The roofed paper container filled with liquid is formed by preparing a bottomed square cylindrical container formed of a paper packaging material having a thermoplastic resinous layer provided on the outside and inside surfaces; standing the container vertically with the container bottom positioned below and the container opening positioned upper; sterilizing the inside of the container; filling a content liquid as a drink, such as milk, a juice or others through an opening in the top of the container; applying hot blast to the part-to-be-hermetically sealed of the inside of the top of the container to soften/melt the thermoplastic resinous layer; and pressing the part-to-be-hermetically sealed to hermetically seal the top opening. The series of these steps (preparing the container, standing the container, the sterilization, filling a liquid, hermetically-sealing the upper part, etc.) is performed inside the packaging/filling device. 
     In the above-described packaging/filling, a blank in a square cylindrical developed shape ( FIG. 1(A) ) is formed into a cylinder with a vertical seal, and then the bottom is folded in to form the bottom by thermal press, and the square cylindrical container is formed ( FIG. 1(D) ). The roofed paper container ( FIG. 1(E) ) is formed by the series of the above-described steps. 
     In the packaging and filling device, a blank of a paper container having the developed shaped and the fold lines as illustrated in  FIG. 1(A)  is used. The blank has a first bottom panel  1   b  and a third bottom panel  3   b  extended from the respective lower sides of a first panel  1  and a third panel  3  which correspond to one pair of 2 opposed container sidewalls; a second bottom panel bottom panel  2   b  and a fourth bottom panel  4   b  extended from the respective lower sides of a second panel  2  and a fourth panel  4  which correspond to the other pair of 2 opposed sidewalls; a fifth panel  6  extended from a part of the lower side of the third bottom panel  3   b ; and plural upper panels it,  2   t ,  3   t ,  4   t  which correspond to the top of the container. In the packaging and filling device, for example, the prior bending mechanism is not used, and the sixth panel is bent with a bending member having 2 curved portions in the step of forming the bottom of the container after the heating step of heating to melt and soften the thermoplastic resinous layer of polyethylene or others on the inside and the outside surfaces (refer to, e.g., Patent Reference 1). 
     The sixth panel is bent to cover the lower surface of the paper packaging material exposed on the inside surface of the container bottom to thereby protected from permeation leakage. 
     PRIOR ART REFERENCES 
     Patent References 
     
         
         Patent Reference 1: Japanese Patent Laid-Open H06-226884 
         Patent Reference 2: Japanese Patent Laid-Open H09-226884 
         Patent Reference 3: Japanese Patent Laid-Open H03-182330 
         Patent Reference 4: Japanese Patent Laid-Open H07-040971 
         Patent Reference 5: Japanese Utility Model Laid-Open S48-13058 
         Patent Reference 6: Japanese Utility Model Registration No. 1582831 
         Patent Reference 7: Japanese Utility Model Laid-Open $63-13144 
       
    
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     When the sixth panel is bent with the bending member in the bottom forming step after the heating step of heating to melt and soften the polyethylene layer on the inside and the outside surfaces, the polyethylene on the inside and the outside surfaces of parts or the entire of the sixth panel is also melted and softened, and there is a risk that the polyethylene might adhere to the parts where the bending member contacts and deposit on the bending member in polyethylene masses and residues. Even when the sixth panel is bent, the bent part cannot sufficiently secure a length necessary to protect the side surface of the packaging material. To ensure the sufficient length, increasing the width of the sixth panel might cause the inconvenience that the sixth panel could not be sufficiently bent. 
     The present invention aims to provide a packaging/filling device, a paper container and a blank which is suitably applicable to the permeation leakage at the lower surface. 
     Means for Solving the Problem 
     A packaging and filling device according to the present invention is characterized by the packaging and filling device for forming a paper container including a cylindrical body having 4 sidewalls and a substantially square cross section, a top and a bottom, the paper container being formed of a blank prepared by cutting a band-shaped packaging material made at least of an outermost thermoplastic layer, a paper layer and an innermost thermoplastic layer; the blank having a developed shape of the paper container and fold lines; the blank including a first bottom panel and a third bottom panel extended the respective lower sides of a first panel and a third panel which are one pair of 2 container sidewalls opposed to each other; and a second bottom panel and a fourth bottom panel extended from the respective lower sides of a second panel and a fourth panel which are the other pair of 2 container sidewalls opposed to each other; the third bottom panel having a sixth panel partially extended from the center of the lower side of the third bottom panel; the sixth panel having a width which is 15-65% of a total length of the lower side of the third bottom panel, and a length necessary to delay the permeation leakage from the side surface; the blank including a plurality of top panels corresponding to the top of the paper container; the bottom of the paper container being formed by extending the sixth panel from the lower side of the third bottom panel; bending the second bottom panel and the fourth panel into triangular flaps with the lower side surfaces of the second and the fourth bottom panels faced outward and bending the flaps inward; laying the first bottom panel and the third bottom panel on the outsides of the second bottom panel and the fourth bottom panel with the first bottom panel positioned outside of the third bottom panel, and pressing from the inside and the outside, and heat-sealing; the packaging and filling device at least including a loading means of taking out 1 out of a bundle of a plurality of blanks having vertically sealed and flattened; a bottom forming means of forming the bottom of the cylindrical blank to form the container having the top opening and the bottom; a filling means of filling liquid food through the top opening; and a top sealing means of heat-sealing the top opening; the loading means including a taking-out means which takes out the blank; an erecting means of erecting the flattened blank into the cylindrical blank; and an infeeder which inserts the mandrel of the bottom forming means into the cylindrical blank, and the press station of the bottom forming means including a triangular emboss which presses the container bottom from the outside and the inside by the forward side surface of the mandrel and a press surface and is provided on the forward edge surface of the mandrel at a position where the third bottom panel is exposed on the inside surface of the container. 
     A paper container according to the present invention is characterized by the paper container having a cylindrical body having 4 sidewalls and a substantially square cross-section, and a top and a bottom, to be formed by a packaging and filling device, the paper container being formed of a blank prepared by cutting a band-shaped packaging material formed at least of an outermost thermoplastic layer, a paper layer and an outermost thermoplastic layer; the blank having a developed shaper of the paper container and fold lines; the blank including a first bottom panel and a third bottom panel extended the respective lower sides of a first panel and a third panel which are one pair of 2 container sidewalls opposed to each other; and a second bottom panel and a fourth bottom panel extended from the respective lower sides of a second panel and a fourth panel which are the other pair of 2 container sidewalls opposed to each other; the third bottom panel having a sixth panel partially extended from the center of the lower side of the third bottom panel; the sixth panel having a width which is 15-65% of a total length of the lower side of the third bottom panel, and a length necessary to delay the permeation leakage from the side surface; the blank including a plurality of top panels corresponding to the top of the paper container; the bottom of the paper container being formed by bending the sixth panel outward; bending the second bottom panel and the fourth panel into triangular flaps with the lower side surfaces of the second and the fourth bottom panels faced outward and bending the flaps inward; laying the first bottom panel and the third bottom panel on the outsides of the second bottom panel and the fourth bottom panel with the first bottom panel positioned outside of the third bottom panel, and pressing from the inside and the outside, and heat-sealing; the packaging and filling device at least including a loading means of taking out 1 out of a bundle of a plurality of blanks having vertically sealed and flattened; a bottom forming means of forming the bottom of the cylindrical blank to form the container having the top opening and the bottom; a filling means of filling liquid food through the top opening; and a top sealing means of heat-sealing the top opening; the loading means including a taking-out means which takes out the blank; and an infeeder which inserts the mandrel of the bottom forming means into the cylindrical blank; and the press station of the bottom forming means including a triangular emboss which presses the container bottom from the outside and the inside by the forward side surface of the mandrel and a press surface and is provided on the forward edge surface of the mandrel at a position where the third bottom panel is exposed on the inside surface of the container. 
     A blank according to the present invention is characterized by the blank for a paper container having a cylindrical body having 4 sidewalls and a substantially square cross-section, and a top and a bottom to be formed by a packaging and filling device, the paper container being formed of a blank prepared by cutting a band-shaped packaging material formed at least of an outermost thermoplastic layer, a paper layer and an outermost thermoplastic layer; the blank having a developed shaper of the paper container and fold lines; the blank including a first bottom panel and a third bottom panel extended the respective lower sides of a first panel and a third panel which are one pair of 2 container sidewalls opposed to each other; and a second bottom panel and a fourth bottom panel extended from the respective lower sides of a second panel and a fourth panel which are the other pair of 2 container sidewalls opposed to each other; the third bottom panel having a sixth panel partially extended from the center of the lower side of the third bottom panel; the sixth panel having a width which is 15-65% of a total length of the lower side of the third bottom panel, and a length necessary to delay the permeation leakage form the side surface; the blank including a plurality of top panels corresponding to the top of the paper container; the bottom of the paper container being formed by extending the sixth panel from the lower side of the third bottom panel, bending the second bottom panel and the fourth panel into triangular flaps with the lower side surfaces of the second and the fourth bottom panels faced outward and bending the flaps inward; laying the first bottom panel and the third bottom panel on the outsides of the second bottom panel and the fourth bottom panel with the first bottom panel positioned outside of the third bottom panel, and pressing from the inside and the outside, and heat-sealing; the packaging and filling device at least including a loading means of taking out 1 out of a bundle of a plurality of blanks having vertically sealed and flattened; a bottom forming means of forming the bottom of the cylindrical blank to form the container having the top opening and the bottom; a filling means of filling liquid food through the top opening; and a top sealing means of heat-sealing the top; the loading means including a taking-out means which takes out the blank; an erecting means of erecting the flattened blank into the cylindrical blank; and an infeeder which inserts the mandrel of the bottom forming means into the cylindrical blank; and the press station of the bottom forming means including a triangular emboss which presses the container bottom from the outside and the inside by the forward side surface of the mandrel and a press surface and is provided on the forward edge surface of the mandrel at a position where the third bottom panel is exposed on the inside surface of the container. 
     Effects of the Invention 
     The invention of the above-described constitution makes the following operational functions and produced advantageous effect. 
     The packaging and filling device according to the present invention, the paper container provided by the packaging and filling device, and the blank used in the packaging and filling device form a paper container having 4 sidewalls and a substantially square cross-section, and a top and a bottom. 
     The paper container having the top of a roof-shaped configuration is a roof-shaped paper container and can be filled with liquid food, such as milk, juices, etc. 
     The paper container is formed of a blank prepared by cutting a band-shaped packaging material formed at least of an outermost thermoplastic layer, a paper layer and an innermost thermoplastic layer. 
     The outermost layer and the innermost layer are formed of a thermoplastic material, such as polyethylene, and are melted and softened by heating ti be heat-sealed by being pressed against each other. 
     The blank has a developed shape of the paper container and fold lines. 
     The blank is prepared by cutting the band-shaped packaging material in the developed shaped of the paper container and is vertically seals into the cylindrical body. The band-shaped packaging material is beforehand provided with the fold lines by forming linear embosses at the to-be-bent lines. 
     The blank has a first bottom panel and a third bottom panel extended the respective lower sides of a first panel and a third panel which are one pair of 2 container sidewalls opposed to each other, and a second bottom panel and a fourth bottom panel extended from the respective lower sides of a second panel and a fourth panel which are the other pair of 2 container sidewalls opposed to each other. The third bottom panel has a sixth panel partially extended from the center of the lower side of the third bottom panel. The blank has a plurality of top panels corresponding to the top of the paper container. 
     The first panel, the second panel, the third panel and the fourth panel are jointed sequentially adjacent to each other, and by vertically sealing the first panel and the fourth panels, a cylindrical body having 4 sidewalls and a substantially square cross-section can be formed. For the vertical seal, the fifth panel extended from the side edge of the fourth panel can be provided. 
     The respective bottom panels are folded, and the container bottom can be formed. The respective upper panels are folded, and the top of the container can be formed. 
     As a characteristic of the present invention, the sixth panel has a width of 15-65%, preferably 20-60%, more preferably 30-55% of the total length of the lower side, and a height (length) which is necessary to delay the permeation leakage from the lower surface. 
     The sixth panel is extended from the lower side of the third bottom panel, whereby the side surface at the center of the lower side of the third bottom panel is covered by the sixth panel along the length corresponding to the width of the sixth panel, and the length is a length (distance) necessary to delay the permeation leakage, and the container can be substantially protected from the permeation leakage. 
     As will be described below, the second bottom panel and the fourth bottom panel are formed into triangular flaps with the lower sides of the second and the fourth panels faced outward and bent inward, and on the inside of the container bottom surface, geometrically, the center of the lower side of the third bottom panel alone is exposed. However, the packaging material is formed mainly of paper, and the exposed part is often expanded, dislocated or deflected. In the present invention, the inside of the container bottom surface can be protected from the expansion, dislocation, deflection, etc. in the wide width corresponding to the total length of the lower side of the third bottom panel, and the container can be highly reliable. 
     In forming the bottom of the paper container, the sixth panel is extended from the lower side of the third bottom panel, and the second bottom panel and the fourth bottom panel are formed into triangular flaps with the lower side surfaces of the second and the fourth bottom panels faced outward and bent inward. 
     The sixth panel is extended from the lower side of the third bottom panel, and even with the side surface of the sixth panel exposed inside the container, sixth panel is long enough to delay the permeation leakage. 
     The second bottom panel and the fourth bottom panel are formed into triangular flaps with the lower side surfaces of the second and the fourth bottom panels faced outward and bent inward, whereby the lower side surfaces of the second and the fourth bottom panels are prevented from exposing inside the container. 
     In forming the bottom of the paper container, with the first bottom panel being outside the third bottom panel, the first bottom panel and the third bottom panel are laid on the outside of the second bottom panel and the fourth bottom panel. 
     The outsides of the second bottom panel and the fourth bottom panel are covered by the first bottom panel and the third bottom panel, whereby the outside surfaces of the second bottom panel and the fourth bottom panel can be protected by the first bottom panel ad the third bottom panel. Furthermore, the first bottom panel is outside the third bottom panel, whereby the side surface of the third bottom panel can covered and protected by the first bottom panel. On the outside of the container bottom, only a minimum side surface, i.e., the lower side surface of the first bottom panel is exposed on the outside of the container. 
     The outermost layer and the innermost layer are formed of a thermoplastic material, such as polyethylene or others, which permits the bottom to be pressed from the inside and the outside to be heat-sealed. 
     The packaging and filling device at least including a loading means of taking out 1 out of a bundle of a plurality of blanks having vertically sealed and flattened; a bottom forming means of forming the bottom of the cylindrical blank to form the container having the top opening and the bottom; a filling means of filling liquid food through the top opening; and a top sealing means of heat-sealing the top opening. 
     In the packaging and filling device, a blank, which is a material of the paper container, is supplied, the bottom is formed, a liquid is filled into the container, the top is sealed, and the paper container is manufactured. 
     The loading means takes out  1  blank out of a supplied bundle of a plurality of blanks vertically sealed and flattened. 
     The loading means supplies a bundle of a plurality of blanks vertically sealed and flattened. One flattened blank is taken out of a bundle of blanks, blanks. The blank taken out is formed cylindrical to be loaded to the next step. 
     The bottom forming means forms the bottom of the cylindrical blank, and the container having the top opening and the bottom is formed. 
     The bottom forming means specifically includes a plurality of mandrels radially provided on a rotary shaft; a mandrel is inserted into a container through the top opening; while the mandrel is intermittently rotated, the container bottom on the outer side of the mandrel is heated; the bottom panels are folded; the container bottom is pressed by the forward surface of the mandrel and he pressing surface from the outside and the inside; and the container having the top opening and bottom can be formed. 
     The filling means fills liquid food, such as milk, juices, etc., through the top opening. 
     The container has the sidewalls and the bottom already formed, and can be without failure filled with liquid food, such as mil, juices, etc. 
     The upper sealing means heats and press the top opening of the container, and can be heat sealed. 
     The packaging and filling device can include, as required, a sterilization means for sterilizes the inside surfaces and the inside of the container with a steriliztion agent such as hydrogen peroxide liquid or others, or a high energy beam, such as ultraviolet ray, electron beam or others; a prior heating means for facilitating the heat-seal, a nitrogen gas replacing means for the upper void of the contained filled with liquid food, or others. 
     The loading means includes a taking-out means for taking out a blank, an erecting means for erecting a flat blank into a cylindrical blank; and an infeeder for inserting a mandrel of the bottom forming means into the cylindrical blank. 
     The erecting means can erect a flat blank into a cylindrical blank. 
     In the infeeder includes a mandrel of the bottom forming means is inserted into the cylindrical blank. 
     The infeeder includes an endless chain, and on the chain, a carrier which is moved together with the sixth panel of the cylindrical blank is provided, and as the carrier is moved downward, the carrier departs from the cylindrical blank and the sixth panel. 
     The press station of the bottom forming means includes a triangular emboss which presses the container bottom from the outside and the inside by the forward side surface of the mandrel and a press surface and is provided on the forward side surface of the mandrel at the position where the third bottom panel is exposed on the inside surface of the container. 
     The triangular flaps of the second and the fourth bottom panels make a triangular step on the insider surface of the container. The triangular emboss is trapped in the triangular step and presses the third bottom panel, and the seal can be made further uniform. 
     As described above, a packaging and filling device, paper container and a blank which is suitably applicable to the permeation leakage from the side surface. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates the paper container usable in the present invention:  FIG. 1(A)  is a plan view of the developed shape of a blank of the paper container,  FIG. 1(B)  is a plan view of the blank vertically sealed and flattened,  FIG. 1(C)  is the cylindrical blank,  FIG. 1(D)  is a perspective view of the empty container having the top opening opened and the bottom formed, and  FIG. 1(E)  is a perspective view of the paper container filled and sealed. 
         FIG. 2  is a perspective view of the paper container usable in the present invention having the top opened and the bottom dissolved. 
         FIG. 3  is a plan view of the blank usable in the present invention vertically sealed and flattened (A) and partial plan views of variations of the sixth pane (B), (C) and (D). 
         FIG. 4  is a perspective view of the bottom of the sectioned paper container usable in the present invention. 
         FIG. 5  is a diagrammatic view which illustrates the loading means usable in the present invention taking out, receiving and transferring a blank. 
         FIG. 6  is a partial perspective view of the rotary roller usable in the present invention, which receives and transfers a blank. 
         FIG. 7  is a perspective view of the forward edge of the infeeder usable in the present invention. 
         FIG. 8  is a dissolved perspective view of the inside and the outside nozzles of the heater for heating the container bottom panel at the outer forward edge of the mandrel of the bottom forming means usable in the present invention. 
         FIG. 9  is a diagrammatic plan view of the bottom forming means usable in the present invention folding the first and the third bottom panels. 
         FIG. 10  is a partial sectional side view of the bottom forming means usable in the present invention folding the first and the third bottom panels. 
         FIG. 11  is a perspective view of the press surface for pressing the container bottom from the outside by the bottom forming means usable in the present invention. 
         FIG. 12  is a schematic view of an example of the packaging and filling device usable in the present invention. 
         FIG. 13  is a perspective view of the paper container usable in the present invention, which is sectioned at the bottom. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     An embodiment of the present invention will be described below in good detail with reference to the attached drawings. 
     In this embodiment, a paper container  9  having, as illustrated in  FIGS. 1(C) and 1(E) , a cylindrical body  8  of a substantially square cross-section having 4 side walls, and a top  10  and a bottom  11  is formed. 
     The paper container having the top in a roofed configuration is a roof-shaped paper container, and can package and be filled with liquid food, such as milk, a juice or others. 
     The ordinary paper container of a capacity of 1 litter has the dimensions of a 73 mm one side of the square and a 234 mm-height of the container. 
     The paper container  9  is formed from a blank  12  prepared by cutting a band-shaped packaging material formed of an outermost thermoplastic layer, a paper layer and an innermost thermoplastic layer in the sequence of  FIGS. 1(A), 1(B), 1(C), 1(D) and 1(E) . 
     The outermost layer and the innermost layer are formed of a heat-sealable material for polyethylene, and are melted and softened by heating, and pressed on each other, and heat-sealed. 
     As illustrated in  FIG. 1(A) , the blank  12  has the developed shape of the paper container  9  and plural fold lines. 
     The blank  12  is formed by cutting the band-shaped packaging material (not illustrated) into the developed shape of the paper container  9 . The blank  12  is vertically sealed into a cylindrical body. The fold lines are formed by linearly embossing the band-shaped packaging material in advance along the lines-to be-folded (the fold lines). 
     As illustrated in  FIG. 1(A) , the blank  12  has a first bottom panel  1   b  and a third bottom panel  3   b  extended from the respective lower sides of a first panel  1  and a third panel  3  which correspond to one pair of 2 opposed container sidewalls, and a second bottom panel  2   b  and a fourth bottom panel  4   b  extended from the respective lower edges of a second panel  2  and a fourth panel  4  which correspond to the other 2 opposed container sidewalls; the sixth panel  6  partially extended from the center of the lower side of the third bottom panel  3   b ; and plural panels  1   t ,  2   t ,  3   t ,  4   t  which correspond to the top  10  of the container  9 . 
     As illustrated in  FIG. 1(A) , the first panel  1 , the second panel  2 , the third panel  3  and the fourth panel  4  are jointed adjacent to each other in the described sequence. The first panel  1  and the fourth panel  4  are vertically sealed to thereby form a cylindrical body having 4 sidewalls and a substantially square cross-section. For the vertical seal, a fifth panel  5  is provided, extended from the side of the fourth panel. 
       FIG. 1(B)  illustrates the blank  13  in the cylindrical body having the fifth panel  5  vertically sealed, which is flattened. 
     This embodiment is characterized in that as illustrated in  FIG. 3(A) , the sixth panel  6  has a width d which is 15-65% of a total length of the lower side of the third bottom panel, preferably 20-60%, more preferably 30-65%, and a height h which facilitates the bend. 
     The specific dimensions of the sixth panel  6  depend on the container capacity (1 side of the container). For example, when one side is 73 mm, the width is, e.g., 20-40 mm. When the width is below the lower limit value excluding the lower limit value, there is a risk that the side surface at the center of the lower side of the third bottom panel  3   b  might be exposed. On the other hand, when the width is over the upper limit value, the thickness of the container bottom increases. 
     The six panel  6  extended from the lower side of the third bottom panel covers the side surface at the center of the lower side of the third bottom panel along the length corresponding to the width of the sixth panel, and the length (distance) is sufficient to delay the permeation leakage is bent to thereby substantially protect the container from the permeation leakage. 
     The shape and the dimensions of the sixth panel  6  is exemplified in  FIGS. 3(B), 3(C) and 3(D) . The shape of the sixth panel  6  is trapezoid, inverse trapezoid, rectangle or others. The shape can be suitably selected and changed. 
     The height (length) of the sixth panel can be selected and varied suitably corresponding to a period of time necessary to delay the permeation leakage. 
     As illustrated In  FIG. 2A , the second bottom panel  2   b  and the fourth bottom panel  4   b  are formed into triangular flaps with the lower side surfaces faced outward, and bent inward. 
     In the design, as illustrated in  FIGS. 4 and 2 , the center  3   bc  of the lower side of the third bottom panel  3   b  is positioned between the forward edges of the triangular flaps. The packaging material is formed mainly of paper, and actually the exposed part may be widened, dislocated or deflected. In this embodiment, the central lower side  3   bc  is wide enough with respect to the total length of the lower side of the third bottom panel to protect the exposed part from the increase, dislocation, deflection, etc. 
     As illustrated in  FIG. 2 , the bottom  11  of the paper container is formed by with the sixth panel  6  being extended, forming the second bottom panel  2   b  and the fourth bottom panel  4   b  into triangular flaps with the lower side surfaces of the second the fourth bottom panels  2   b ,  4   b  faced outward and bending the flaps inward. 
     As illustrated in  FIG. 4 , the xith panel  6  is extended long from the lower side of the third bottom panel  3   b , whereby with the side surface of the sixth panel  6  exposed inside the container, the permeation leakage can be delayed. 
     As illustrated in  FIG. 2 , in forming the bottom  11  of the paper container, the first bottom panel  1   b  and the third bottom panel  3   b  are so laid on the outsides of the second bottom panel  2   b  and the fourth bottom panel  4   b  that the first bottom panel  1   b  is on the outside of the third bottom panel  3   b.    
     The outsides of the second bottom panel  2   b  and the fourth bottom panel  4   b  are covered by the first bottom panel  1   b  and the third bottom panel  3   b , whereby the side surfaces of the outsides of the second bottom panel  2   b  and the fourth bottom panel  4   b  are protected by the first bottom panel  1   b  and the third bottom panel  3   b . Furthermore, the first bottom panel  1   b  is outside the third bottom panel  3   b , whereby the respective side surfaces of the third bottom panel  3   b  and the sixth panel  6  are covered and protected by the first bottom panel  1   b . On the outside surface of the container bottom, the lower side surface alone of the first bottom panel is exposed on the outside of the container. 
     As illustrated in the schematic view of  FIG. 12 , the packaging and filling device according to this embodiment comprises a loading means  15  which takes out  1  blank  13  out of a supplied bundle of a plurality of vertically sealed and flattened blanks and loads the cylindrical blank  8 ; a bottom forming means  16  which forms the bottom of the cylindrical blank  8  to prepare a container  14  having the top opening and the bottom; a filling means  17  which fills liquid food through the top opening; and a top sealing means  18  which heat-seals the top opening. 
     In the packaging and filling device, a blank  13  of a cylindrical body of a paper container material, which is vertically sealed and flattened is loaded, the container bottom  11  is formed, a liquid is filled in the container, and the top is heat-sealed to manufacture a paper container  9 . 
     The loading means  15  takes out  1  blank  13  out of a supplied bundle  20  of a plurality blanks vertically sealed and flattened and loads the cylindrical blank  8  in the bottom forming means  16 . 
     The loading means  15  includes a taking-out means  21  which takes out a blank  13 ; an erecting means  22  which erects the blank  13  flattened into a cylindrical blank; an infeeder  23  which inserts the cylindrical blank into the mandrel of the bottom forming means. 
     The taking-out means  21  supplies a bundle of a plurality of blanks vertically sealed and flattened and takes out  1  flat blank out of the bundle  20  of blanks, blanks. 
     As illustrated in  FIG. 3(A) , the sixth panel  6  of the blank taken out is protruded from the panel of the 2 staked panels of the first bottom panel  1   b  and the third bottom panel  3   b.    
     The taking-out means  21  of this embodiment will be described with reference to  FIGS. 5 and 6 . 
     The taking-out means  21  includes a suction means  24  which suctions and falls down  1  blank  13  from a bundle  20  with the suction force; and a circular roller  25  and the opposed roller  26  which pinches the edge of the blank  13  to carry the blank  13 . In this embodiment, 3 circular rollers  25  are provided on the axis  27  of the rotary roller. 
     The flattened blank  13  taken out is received by the rotary roller  25  and carries to the next step. The rotary roller  25  senses the position of the blank and rotates the roller to receive the blank, holding the blank together with the opposed roller  26 . 
     The erecting means  22  erects the flattened blank  13  to the cylindrical blank  8  as illustrated in  FIG. 1(C) . 
     The infeeder  23  inserts the cylindrical blank  8  with kept the sixth pane foldable into the mandrel of the bottom forming means  16 . 
     The perspective view of  FIG. 7  illustrates the situation of the forward edge of the infeeder  23  of this embodiment. The forward edge of the feeder conveyor  29  of the infeeder  23  with respect to the mandrel  28  of the bottom forming means  16 . A carrier  30  is attached to the feeder conveyor  29 . A cylindrical blank  8  (not illustrated in  FIG. 7 ) is positioned in front of the carrier  30  of the feeder conveyor  29 , and as the cylindrical blank  8  is moved along the feeder conveyor  29 , the carrier  30  follows the cylindrical blank  8 . As the cylindrical blank  8   s  transferred to the mandrel  28 , the infeeder conveyor  29  goes downward to return to the original position, and resultantly the carrier  30  as well starts to move downward. As the carrier  30  moves downward, the sixth panel as well follows, and then when the feeder conveyor  29  further moves, the carrier  30  departs from the mandrel  28  and the sixth panel  6 . 
     The bottom forming means  16  forms the bottom of the cylindrical blank, and a container  14  having the opening and the bottom. 
     The bottom forming means  16 , in this embodiment, has a plurality of mandrels provided radially on a rotary shaft. The mandrels are engaged into the containers through the top openings; while the mandrels are intermittently rotated, the bottoms of the containers on the outer edges of the mandrels are heated by a heat station  32 ; the bottom panels are folded by a panel folding station  33 ; and the container bottoms are pressed from both the inside and the outside by the forward edge surfaces of the mandrels and the press surfaces, and the containers  14  respectively having the top openings and the bottoms are formed. 
     The bottom forming means  16  transfers blanks by a rotary mandrel assembly having a plurality of mandrels radially directed outward. 
     The mandrels are turned to the heating station  32  to heat the bottom panels of the blanks by a suitable heating device. This heating device blows hot blast through a nozzle to the bottom panels. The mandrels are turned to the next panel folding station  33  to bent the bottom panels, and at a press station  34 , the sealed bottom walls of the containers are formed. 
     The heater for heating the bottom panels of a container of the heating station  32  of the bottom forming means  16  will be described with reference to  FIG. 8  which illustrates a perspective view of the nozzle. 
     An inner nozzle  35   a  and an outer nozzle  35   b  of the heater respectively blast hot air to the inside surfaces and the outside surfaces of the bottom panels (not illustrated in  FIG. 8 ) to heat them. 
     The heater approaches the forward edge of the mandrel so that the bottom panel are engaged in the gap between the inner nozzle  35   a  and the outer nozzle  35   b  assembled. 
     In  FIG. 8 , the inner nozzle  35   al  heats the inside surface of the first bottom panel  1   b ; the inner nozzle  35   a   4  heats the inside surface fo the fourth bottom panel  4   b ; the outer nozzle  35   b   2  heats the outer surface of the second bottom panel  2   b ; and the outer nozzle  35   b   3  heats the inside surface of the third bottom panel  3   b.    
     Folding of the bottom panels toward the mandrel forward surface  37  at a panel forming station  33  will be described with reference to  FIGS. 8 and 10 . 
     In  FIG. 9 , the second bottom panel  2   b  and the fourth bottom panel  4   b  are formed into triangular flaps by the arms  36   a ,  36   a  of a second and a fourth panel folding members  36 ,  36  into triangular flaps with the lower edge surfaces  2   be ,  4   be  of the second and the fourth bottom panels  2   b ,  4   b  faced outward and are bent inward by the arms  361 ,  36   b  of a second and a fourth panel folding members  36 ,  36 . 
     In  FIG. 9 , the first bottom panel  1   b  and the third bottom panel  3   b  are not illustrated. 
     Before the folding of the second bottom panels  2   b  and the fourth bottom panel  4   b  finishes, the folding of the first bottom panel  1   b , the third bottom panel  3   b  and the sixth panel is started. 
     In  FIG. 10 , the first and the third bottom panels  1   b ,  3   b  are folded by the first panel folding member  36  and the third panel folding member  38  of the bottom forming means.  FIG. 10  does not illustrate the second bottom panel and the fourth bottom panel. 
     In this embodiment, the six panel  6  is extended from the side of the third bottom panel  3   b.    
     The third bottom panel  3   b  is laid on the outsides of the second bottom panel  2   b  and the fourth bottom panel  4   b  (not illustrated in  FIG. 10 ) by the third panel folding member  38  so that the first bottom panel  1   b  is outside of the third bottom panel  3   b.    
     The first bottom panel  1   b  is folded by the first panel folding member  39  so that the first bottom panel  1   b  is laid on the outside of the third bottom panel  3   b.    
     The outsides of the second bottom panel  2   b  and the fourth bottom panel  4   b  are covered by the first bottom panel  1   b  and the third bottom panel  3   b . The respective side surfaces of the third bottom panel  3   b  and the sixth panel  6  are covered by the first bottom panel  1   b.    
     In the press station  34  of the bottom forming means  16 , the container bottom  11  is pressed from the outside and the inside thereof by the mandrel forward side surface  37  and the press surface  40 . 
     In this embodiment, the press surface  40  includes a plane  40   a  opposed to the outside surface of the first bottom plane  1   b , a plane  40   a  opposed to the outside surface of the first bottom panel  1   b , a plane  40   c  opposed to the outside surface of the third bottom panel  3   b , a projected surface  40   b  having a flat top surface for forming a wide upward trench in the container bottom  11 , and a plurality of embosses  40   d  for reinforcing the seal. 
     All of the press surfaces  40   a ,  40   b ,  40   c  are flat, and the bottom surface of the container bottom is also free from concavities and convexities. 
     As illustrated in  FIG. 9 , the mandrel forward surface has a triangular emboss  41  at the position opposed to the position where the third bottom panel  3   b  is exposed on the inside surface of the container. 
     As illustrated in  FIG. 4  and  FIG. 13 , the triangular flaps of the second and the fourth bottom panels  2   b ,  4   b  form a triangular step H on the inside surface of the container. The triangular emboss  42  is trapped in the triangular step H and presses the third bottom panel  3   b . The central part of the inside surface of the container bottom has steps and discontinuous parts formed, but the embosses are inserted for further uniform pressing. 
     In this embodiment, the filling means  17  fills liquid food, such as milk, juices, etc., into the container through the opening. 
     The container has the side walls and the bottom already formed. 
     In this embodiment, an upper sealing means  18  the top opening of the container  10  is heated and pressed to be heat-sealed. 
     The packaging and filling device comprises a sterilization means of sterilizing the inside surface and the inside of the container with a sterilization agent, such as hydrogen peroxide liquid or others, or a high energy beam, such as ultraviolet ray, electron beam or others; a prior heating means which facilitates the heat-seal; and a nitrogen gas replacing means which fills nitrogen gas into the upper void of the container filled with liquid food. 
     As described above, this embodiment provides a packaging and filling device, paper container and blank which is suitably applicable to permeation leakage from the side surface. 
     The present invention is not limited to the embodiment described above and can be variously modified, based on the concept of the present invention, and the modifications and the variations are not excluded from the scope of the present invention. 
     INDUSTRIAL APPLICABILITY 
     The present invention is applicable to the manufacture of packaging/filling liquid food. 
     REFERENCE NUMBERS 
     
         
           1  first panel 
           2  second panel 
           3  third panel 
           4  fourth panel 
           6  sixth panel 
           9  paper container 
           12 ,  13  blank