Patent Publication Number: US-2019179178-A1

Title: Substrate processing device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority from Japanese Patent Application No. 2017-237562 filed on Dec. 12, 2017. The entire contents of the priority application are incorporated herein by reference. 
     TECHNICAL FIELD 
     The technology described herein relates to a substrate processing device that performs a cleaning treatment of cleaning a liquid crystal substrate after performing an alignment treatment. 
     BACKGROUND 
     In producing a liquid crystal panel that is a component of a liquid crystal display device, a surface of a liquid crystal glass substrate is coated with a polymer film such as a polyimide film and an alignment treatment such as a rubbing treatment or a polarized ultraviolet ray irradiation treatment is performed. 
     In the rubbing treatment, minute dust or shavings is created by rubbing the surface of the polymer film. The surface of the substrate is cleaned with ultrasonic waves or high pressure spray using pure water to remove foreign obstacles adhering to the surface of the substrate after the rubbing treatment. However, in the cleaning of the substrate, cleaning unevenness is often occurred. 
     To effectively remove foreign obstacles and restrict occurrence of the cleaning unevenness on the surface of the substrate, a film forming treatment of forming a film on the surface of the substrate with isopropyl alcohol (IPA) having a hydrophilic property has been widely performed. Specifically, IPA is sprayed on the surface of the substrate to form a thin film of IPA. It is assumed that the cleaning unevenness is reduced by forming an IPA thin film before performing the cleaning with pure water since it is less likely to occur that IPA is replaced with pure water in subsequent processes and moisture remains locally on the surface of the alignment film and partial hydrolysis is undergone. Such a method is described in Unexamined Japanese Patent Application Publication No. 9-33927. 
     SUMMARY 
     IPA has a low boiling point and high volatility. Since a liquid crystal glass substrate has been increased in size recently, it takes longer time for a liquid crystal glass substrate including the IPA thin film to reach a cleaning tank compared to a prior art. Therefore, in the IPA thin film that has been previously formed, a front section of the IPA thin film in a transferring direction may start to be dried. Such unevenness of forming of the film may cause cleaning unevenness and this may adversely affect lowering of quality of a liquid crystal display device. 
     The technology described herein was made in view of the above circumstances. An object is to provide a substrate processing device in which a liquid crystal substrate that has been subjected to an alignment treatment is transferred from a film forming tank to a subsequent tank while the liquid crystal substrate being entirely covered with a thin film of pretreatment material. 
     A substrate processing device according to the technology described herein includes a transferring device, a cleaning tank, a film forming tank, and a replacement tank. The transferring device transfers a liquid crystal substrate after being subjected to an alignment treatment in a transferring direction. The liquid crystal substrate is cleaned with water-based cleaning material in the cleaning tank. The film forming tank is arranged on an upstream side of the cleaning tank with respect to the transferring direction and a thin film of pretreatment material is formed on the liquid crystal substrate in the film forming tank. The replacement tank is arranged on the upstream side of the cleaning tank with respect to the transferring direction and the thin film is replaced with the water-based cleaning material in the replacement tank. The film forming tank includes a first supply unit and a second supply unit. The first supply unit supplies the pretreatment material to an alignment treatment surface of the liquid crystal substrate transferred to the film forming tank by the transferring device, the first supply unit supplies the pretreatment material to the alignment treatment surface so as to spread in a curtain form in a direction along the alignment treatment surface and perpendicular to the transferring direction and supply the pretreatment material obliquely toward a downstream side in the transferring direction. The second supply unit is arranged on a downstream side of the first supply unit in the film forming tank with respect to the transferring direction, the second supply unit supplies the pretreatment material to at least a section of the alignment treatment surface. 
     According to such a configuration, the pretreatment material is supplied to the alignment treatment surface of the liquid crystal substrate in a curtain form with the first supply unit. Therefore, the thin film of the pretreatment material is formed on an entire area of the alignment treatment surface almost evenly with less unevenness. Furthermore, the pretreatment material that is supplied obliquely toward the downstream side can spread effectively and the pretreatment material is less likely to be scattered compared to a configuration in which the pretreatment material is supplied vertically or obliquely toward the upstream side. A flowing (spreading) rate of the pretreatment material that is on the alignment treatment surface is gradually lowered during the transfer to the replacement tank and the flowing (spreading) is finally stopped and the alignment treatment surface is stably covered with the pretreatment material. 
     In using a large substrate having as the liquid crystal substrate, the front side section of the pretreatment material with respect to the transferring direction is volatilized and a part of the liquid crystal substrate may start to be dried. However, the second supply unit is arranged on the downstream side of the first supply unit with respect to the transferring direction and the additional pretreatment material is supplied to the liquid crystal substrate by the second supply unit. Therefore, the liquid crystal substrate is less likely to be partially dried and the liquid crystal substrate is transferred to the replacement tank while being effectively covered with the pretreatment material. Therefore, flowing or spread unevenness is less likely to be caused in the subsequent replacement treatment step and quality of the liquid crystal display device is less likely to be lowered. The second supply unit may be one or multiple second supply units may be arranged in the transferring direction. 
     The technology described herein provides a substrate processing device in which a liquid crystal substrate that has been subjected to an alignment treatment is transferred from a film forming tank to a subsequent tank while the liquid crystal substrate being entirely covered with a thin film of pretreatment material. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a substrate processing device according to a first embodiment. 
         FIG. 2  is a schematic perspective view illustrating a curtain type shower and a pipe type shower ejecting IPA to an IPA liquid crystal substrate. 
         FIG. 3  is a bottom view of the pipe type shower. 
         FIG. 4  is a schematic view illustrating the pipe type shower ejecting IPA to the liquid crystal substrate. 
         FIG. 5  is a bottom view of a pipe type shower according to a second embodiment. 
         FIG. 6  is a schematic view illustrating the pipe type shower ejecting IPA to the liquid crystal substrate. 
         FIG. 7  is a bottom view of a pipe type shower according to a third embodiment. 
         FIG. 8  is a schematic view illustrating the pipe type shower ejecting IPA to the liquid crystal substrate. 
         FIG. 9  is a bottom view of a pipe type shower according to a forth embodiment. 
         FIG. 10  is a schematic view illustrating the pipe type shower ejecting IPA to the liquid crystal substrate. 
     
    
    
     DETAILED DESCRIPTION 
     First Embodiment 
     A first embodiment of the present technology will be described with reference to  FIGS. 1 to 4 . 
     As illustrated in  FIG. 1 , a substrate processing device  10  according to this embodiment includes treatment tanks. The substrate processing device  10  cleans foreign obstacles such as minute dust or shavings adhering on a surface of a liquid crystal substrate  20 . Such foreign obstacles are generated by an alignment treatment such as rubbing a polyimide film. 
     In the following description, an X-axis direction in  FIG. 1  is defined as a transferring direction of the liquid crystal substrate  20  (a front-rear direction), an Y-axis direction that is perpendicular to a paper surface is defined as a right-left direction (a width direction of the liquid crystal substrate  20  that is transferred), and a Z-axis direction is defined as a vertical direction. In  FIG. 1 , a left side is an upstream side in the transferring direction and a right side is a downstream side in the transferring direction. In the substrate processing device  10 , the liquid crystal substrate  20  is introduced into a tank from the upstream side in the transferring direction while an alignment treatment surface  20 A (a surface where a thin film is to be formed) facing upward and the liquid crystal substrate  20  being in a horizontal state. The liquid crystal substrate  20  is transferred from the upstream side to the downstream side in the transferring direction by a transferring device  15  while a long side direction thereof being along the X-axis direction and a short side direction thereof being along the Y-axis direction. 
     As illustrated in  FIG. 1 , the substrate processing device  10  includes four treatment tanks including a film forming tank  11 , a replacement tank  12 , a cleaning tank  13 , and a drying tank  14  in this order from the upstream side (the left side). The substrate processing device  10  includes the transferring device  15 . The transferring device  15  includes transferring rollers  16  that transfer the liquid crystal substrate  20  with a driving source, which is not illustrated, in the transferring direction (the X-axis direction). The liquid crystal substrate  20  is intermittently supported by the transferring rollers  16  that are contacted with a plate surface (a lower surface) of the liquid crystal substrate  20  opposite from an alignment treatment surface  20 A (a surface where a thin film is to be formed). Thus, the liquid crystal substrate  20  is transferred sequentially through each of the treatment tanks in the transferring direction by the transferring device  15  and is subjected to respective treatment in each treatment tank. 
     In this embodiment, the liquid crystal substrate  20  has a size of G4.5 or G6 and the transferring speed is 2000 mm/min. to 3000 mm/min. 
     In the film forming tank  11 , after the alignment treatment with the rubbing method and before the cleaning with water, a thin film of isopropyl alcohol (IPA  21 ) (an example of pretreatment material) is formed on the liquid crystal substrate  20 . In an upper section of the film forming tank  11 , a curtain type shower  17  (an example of a first supply unit) and a pipe type shower  18  (an example of a second supply unit) are arranged. The curtain type shower  17  and the pipe type shower  18  are arranged above the liquid crystal substrate  20  that is introduced into the tank. The curtain type shower  17  is arranged on the upstream side and the pipe type shower  18  is arranged on the downstream side in the transferring direction. IPA  21  is supplied to the alignment treatment surface  20 A of the liquid crystal substrate  20  by the curtain type shower  17  and the pipe type shower  18 . 
     The curtain type shower  17  is connected to a pipe extending from an IPA storing tank, which is not illustrated, and extends in a direction that is along the alignment treatment surface  20 A (an X-Y plane surface) of the liquid crystal substrate  20  and perpendicular to the transferring direction (the Y-axis direction). The curtain type shower  17  has thin and long slits, which are not illustrated, on a lower edge surface and IPA  21  is ejected through the slits in a curtain form as illustrated in  FIG. 2 . The slits are formed such that IPA  21  is ejected to the alignment treatment surface  20 A (the X-Y surface) of the liquid crystal substrate  20  at a certain angle θ toward the downstream side in the transferring direction (toward the right side in  FIG. 1 ). Namely, the slits are formed such that IPA  21  is ejected therethrough in a liquid curtain form. The alignment treatment surface  20 A of the liquid crystal substrate  20  is covered with an IPA thin film that is formed from IPA  21  ejected obliquely from the curtain type shower  17 . The IPA thin film is formed with less unevenness and almost evenly in an entire area of the alignment treatment surface  20 A. The angle θ is preferably within a range from 30° to 80°. 
     The IPA thin film disposed on the liquid crystal substrate  20  may be volatilized gradually from an edge portion of the liquid crystal substrate  20  near a front side with respect to the transferring direction, particularly from a corner portion, and a part of the thin film may be removed from the liquid crystal substrate  20  before being transferred to the replacement tank  12 . 
     However, in the substrate processing device  10  of this embodiment, the pipe type shower  18  is arranged in the downstream side of the curtain type shower  17 . IPA  21  is ejected to the liquid crystal substrate  20  again by the pipe type shower  18  with a time difference after the IPA ejection by the curtain type shower  17  and before the liquid crystal substrate  20  is discharged from the film forming tank  11 . 
     The pipe type shower  18  is made of metal and connected to a pipe extending from the IPA storing tank, which is not illustrated. The pipe type shower  18  has a thin elongated cylindrical shape extending along the alignment treatment surface  20 A (the X-Y surface) of the liquid crystal substrate  20  and extending in a direction (the Y-axis direction) perpendicular to the transferring direction. As illustrated in  FIG. 3 , the pipe type shower  18  includes ejecting holes  18 A on a surface (a lower surface) opposite the liquid crystal substrate  20 . The ejecting holes  18 A are arranged in a line at an equal interval. IPA  21  is ejected through the ejecting holes  18 A vertically to the liquid crystal substrate  20 . The ejecting holes  18 A have a same hole diameter. Specifically, each of the ejecting holes  18 A has a hole diameter from 0.5 mm φ to 1.0 mm φ and a distance between the adjacent ejecting holes  18 A is from 10 mm to 15 mm. The ejecting amount is from 5 l/min. to 20 l/min. The IPA thin film is formed on the alignment treatment surface  20 A of the liquid crystal substrate  20  entirely over a width direction of the liquid crystal substrate  20  just before being discharged from the film forming tank  11 . 
       FIG. 4  illustrates a schematic view of the liquid crystal substrate  20  to which IPA  21  is ejected from the pipe type shower  18  to the liquid crystal substrate  20  (the alignment treatment surface  20 A). IPA  21  is ejected through the ejecting holes  18 A of the pipe type shower  18  and the amount of IPA  21  ejected from each ejecting hole  18 A is same. IPA  21  supplied to the liquid crystal substrate  20  may flow toward the side edges of the liquid crystal substrate  20 . According to the influence of the surface tension of IPA  21 , IPA  21  on the liquid crystal substrate  20  has a film thickness that is great at a middle section thereof with respect to a width direction (the Y-axis direction) and is smaller as is closer the side edges as illustrated in  FIG. 4 . 
     It is preferable to arrange the pipe type shower  18  away from an IPA supply section of the curtain type shower  17  on the alignment treatment surface  20 A by a distance of 30 cm to 90 cm. If the pipe type shower  18  is too close to the curtain type shower  17 , the flowing of IPA  21  ejected from the curtain type shower  17  may not be stopped when IPA  21  is ejected from the pipe type shower  18 . Therefore, IPA  21  ejected from the pipe type shower  18  is likely to be influenced by the flowing of IPA ejected from the curtain type shower  17  and is likely to flow. If the pipe type shower  18  is too far away from the curtain type shower  17 , a greater section of the IPA thin film that has been formed with the curtain type shower  17  may be removed and therefore, an amount of IPA  21  that is necessary for the pipe type shower  18  to be additionally ejected is increased and it is wasteful. 
     Extra IPA on the liquid crystal substrate  20  is removed with an air knife  19  mounted near a discharge port of the film forming tank  11 . As illustrated in  FIG. 1 , the liquid crystal substrate  20  is transferred from the film forming tank  11  to the replacement tank  12  while the entire upper surface (the alignment treatment surface  20 A) of the liquid crystal substrate  20  being covered with the thin film of IPA  21 . 
     The replacement tank  12  includes a curtain type shower  22  that is similar to that mounted in the film forming tank  11 . The curtain type shower  22  is arranged in an upper section of the replacement tank  12 . Namely, the curtain type shower  22  is arranged on the upstream side in the transferring direction and above the liquid crystal substrate  20  that is introduced into the tank by the transferring device  15 . Pure water (an example of water-based cleaning material) for replacement is ejected from the curtain type shower  22  to the liquid crystal substrate  20 . The replacement tank  12  includes nozzle type showers  23  made of resin on a downstream side of the curtain type shower  22 . Each of the nozzle type showers  23  has nozzles through which pure water for replacement is supplied to the liquid crystal substrate  20 . 
     The nozzle type shower  23  extends along the alignment treatment surface  20 A of the liquid crystal substrate  20  and extends straightly in a direction (the Y-axis direction) perpendicular to the transferring direction. Two to four nozzle type showers  23  (two nozzle type showers  23  in this embodiment) are arranged in the transferring direction. IPA  21  is replaced with pure water supplied to the surface (the alignment treatment surface  20 A) of the liquid crystal substrate  20  and the entire surface of the substrate is covered with pure water. 
     The liquid crystal substrate  20  that has been subjected to the pure water replacement treatment in the replacement tank  12  is transferred to the cleaning tank  13  by the transferring device  15 . The cleaning tank  13  includes the nozzle type showers  23  that are similar to those mounted in the replacement tank  12 . The nozzle type showers  23  are arranged in an upper section of the cleaning tank  13  and are arranged above the liquid crystal substrate  20  that is introduced into the cleaning tank  13  by the transferring device  15 . The nozzle type showers  23  (three nozzle type showers  23  in this embodiment) are arranged in the transferring direction. The liquid crystal substrate  20  is subjected to a high pressure cleaning treatment with pure water ejected from the nozzle type showers  23  such that foreign obstacles on the surface of the liquid crystal substrate  20  are removed. 
     The cleaning tank  13  includes the air knife  19  near a discharge port thereof. Liquid is removed from the liquid crystal substrate  20  with the air knife  19  and the liquid crystal substrate  20  is transferred to the drying tank  14  by the transferring device  15 . In the drying tank  14 , extra moisture that remains on the liquid crystal substrate  20  and has not been removed completely with the air knife is removed completely. The liquid crystal substrate  20  is subjected to a high temperature drying treatment and discharged from the drying tank  14  and discharged from the substrate processing device  10 . 
     Next, operations and advantageous effects of the substrate processing device  10  of the present embodiment will be described. 
     The substrate processing device  10  according to this embodiment includes the transferring device  15  that transfers the liquid crystal substrate  20  in the transferring direction, the cleaning tank  13  in which the liquid crystal substrate  20  is subjected to the water-based cleaning material and cleaned, the film forming tank  11  and the replacement tank  12  that are arranged on the upstream side of the cleaning tank  13  with respect to the transferring direction. The thin film of IPA  21  is formed on the liquid crystal substrate  20  in the film forming tank  11  and the thin film is replaced with the water-based cleaning material in the replacement tank  12 . The film forming tank  11  includes the curtain type shower  17  that ejects IPA  21  to the alignment treatment surface  20 A of the liquid crystal substrate  20  transferred by the transferring device  15 . The curtain type shower  17  supplies IPA  21  in a curtain form so as to spread in a direction along the alignment treatment surface  20 A and perpendicular to the transferring direction. IPA  21  is ejected obliquely toward the downstream side in the transferring direction. The film forming tank  11  includes the pipe type shower  18  that supplies IPA  21  to the alignment treatment surface  20 A on the downstream side of the curtain type shower  17  with respect to the transferring direction. 
     According to such a configuration, IPA  21  is supplied to the alignment treatment surface  20 A of the liquid crystal substrate  20  in a curtain form with the curtain type shower  17 . Therefore, the thin film of IPA  21  is formed on an entire area of the alignment treatment surface  20 A almost evenly with less unevenness. Furthermore, IPA  21  that is ejected from the curtain type shower  17  obliquely toward the downstream side can spread effectively and IPA  21  is less likely to be scattered compared to a configuration in which IPA  21  is ejected vertically or obliquely toward the upstream side. A flowing (spreading) rate of IPA  21  that is on the alignment treatment surface is gradually lowered during the transfer to the replacement tank  12  and the flowing (spreading) is finally stopped and the alignment treatment surface  20 A is stably covered with IPA  21 . 
     In using a large substrate having a G4 size or greater as the liquid crystal substrate  20 , the front side section of the IPA thin film with respect to the transferring direction is volatilized and a part of the liquid crystal substrate  20  may start to be dried. However, the pipe type shower  18  is arranged on the downstream side of the curtain type shower  17  with respect to the transferring direction and the additional IPA  21  is ejected to the liquid crystal substrate  20  by the pipe type shower  18 . Therefore, the liquid crystal substrate  20  is less likely to be partially dried and the liquid crystal substrate  20  is transferred to the replacement tank  12  while being effectively covered with IPA  21 . 
     Accordingly, in the replacement tank  12 , pure water ejected from the curtain type shower  22  spreads over IPA  21  evenly and without having unevenness and the IPA film is replaced with the pure water. Therefore, unevenness is less likely to be caused in cleaning the liquid crystal substrate  20  with pure water in the cleaning tank  13  and quality of the liquid crystal display device is less likely to be lowered. 
     In the substrate processing device  10 , the curtain type shower  17  is arranged such that IPA  21  is ejected at a certain angle θ with respect to the alignment treatment surface  20 A (the X-Y plan surface) of the liquid crystal substrate  20  toward the downstream side (the right side in  FIG. 1 ) in the transferring direction. Namely, IPA  21  is ejected obliquely in a liquid curtain form. Therefore, IPA  21  is less likely to be scattered compared to a configuration in which the liquid curtain form is vertical or inclined obliquely toward the upstream side. 
     The pipe type shower  18  has the ejecting holes  18 A through which IPA  21  is ejected to the liquid crystal substrate  20 . The ejecting holes  18 A are arranged at an equal interval in the direction along the alignment treatment surface  20 A and the perpendicular to the transferring direction. 
     According to such a configuration, IPA  21  is supplied evenly over an entire area extending in a width direction (the Y-axis direction) of the liquid crystal substrate  20 . 
     The pipe type shower  18  that has a smaller ejecting amount and a simpler configuration than the curtain type shower  17  is used as a second IPA supply unit such that the IPA thin film is less likely to be partially dried with a simple structure as a whole. 
     Furthermore, in the pipe type shower  18  with a small ejecting amount, IPA  21  is ejected vertically to the alignment treatment surface  20 A such that the supplied IPA  21  is less likely to flow on the alignment treatment surface  20 A. 
     Second Embodiment 
     A second embodiment of the present technology will be described with reference to  FIGS. 5 and 6 . The second embodiment includes a pipe type shower  38  that differs from that of the first embodiment. Other configurations are same as those of the first embodiment and will not be described. 
     The pipe type shower  38  included in the film forming tank of a substrate processing device according to this embodiment differs from that of the first embodiment. As illustrated in  FIG. 5 , the pipe type shower  38  has ejecting holes  38 A locally at two end sections with respect to a direction (the Y-axis direction) perpendicular to the transferring direction. The IPA  21  thin film formed on the liquid crystal substrate  20  tends to be thinner at the two end sections with respect to the width direction (the Y-axis direction) of the liquid crystal substrate  20  and to be relatively thick in a middle section thereof. The pipe type shower  38  has the ejecting holes  38 A at the two end sections thereof that correspond to the two end sections to the IPA  21  thin film and has no ejecting hole at the middle section thereof that corresponds to the middle section of the IPA  21  thin film. Namely, the ejecting amount of IPA ejected from the pipe type shower  38  has a certain distribution with respect to the width direction. 
     As illustrated in  FIG. 6 , the liquid crystal substrate  20  to which IPA  21  is ejected with such a pipe type shower  38  has a film thickness greater at the two end sections thereof with respect to the width direction than the film thickness of the middle section. 
     According to the configuration of the second embodiment, IPA  21  is additionally supplied to only the thin sections of the liquid crystal substrate  20 , that are the two end sections of the liquid crystal substrate  20  with respect to the direction along the alignment treatment surface  20 A and perpendicular to the transferring direction. Therefore, IPA  21  can be saved. 
     Third Embodiment 
     A third embodiment of the present technology will be described with reference to  FIGS. 7 and 8 . The third embodiment includes a pipe type shower  48  that differs from that of the first embodiment. 
     As illustrated in  FIG. 7 , the pipe type shower  48  has ejecting holes  48 A having different hole diameters. The hole diameter of the ejecting holes  48 A decreases as is closer to the middle section of the pipe type shower  48  with respect to the direction (the Y-axis direction) perpendicular to the transferring direction and increases as is closer to the two end sections thereof. Namely, the ejecting amount of IPA ejected from the pipe type shower  48  has a certain distribution with respect to the width direction. The ejecting holes  48 A are arranged at an equal interval. 
     A part of the IPA thin film that is formed over an entire area of the alignment treatment surface  20 A with the curtain type shower  17  may be volatilized and removed, and the removed section can be supplied with IPA  21  again by the pipe type shower  48  of this embodiment. Furthermore, IPA  21  is additionally supplied with a certain distribution with respect to the width direction such that the amount of IPA ejected from the pipe type shower  48  is increased at the thin sections (the two end sections with respect to the direction perpendicular to the transferring direction) of the liquid crystal substrate  20 . Therefore, as illustrated in  FIG. 8 , the IPA thin film is formed with a substantially same thickness over the entire area with respect to the width direction and the liquid crystal substrate  20  having such an IPA thin film is transferred to a first cleaning tank. 
     Fourth Embodiment 
     A fourth embodiment of the present technology will be described with reference to  FIGS. 9 and 10 . The fourth embodiment includes a pipe type shower  58  that differs from that of the first embodiment. 
     As illustrated in  FIG. 9 , the pipe type shower  58  of this embodiment has ejecting holes  58 A. The pipe type shower  58  has the ejecting holes  58 A at a low density in a middle section thereof and at a higher density at two end sections thereof. Namely, the ejecting amount of IPA ejected from the pipe type shower  58  has a certain distribution with respect to the width direction. The ejecting holes  58 A have a same hole diameter. 
     Similarly to the third embodiment, a part of the IPA thin film that is formed over an entire area of the alignment treatment surface  20 A with the curtain type shower  17  may be volatilized and removed, and the removed section can be supplied with IPA  21  again by the pipe type shower  58  of this embodiment. Therefore, as illustrated in  FIG. 10 , the IPA thin film is formed with a substantially same thickness over the entire area with respect to the width direction and the liquid crystal substrate  20  having such an IPA thin film is transferred to a first cleaning tank. 
     Other Embodiments 
     The technology described herein is not limited to the embodiments described in the above sections and the drawings. For example, the following embodiments may be included in a technical scope. 
     (1) The pretreatment material and the water-based cleaning material may not be limited to the above described examples and other materials may be used. 
     (2) Instead of the pipe type shower, any other types of supply unit such as metal nozzle type shower having an IPA resistance property may be used as the second supply unit. 
     (3) The pipe type shower (the second supply unit) may be formed in a V-shape such that a middle section thereof is disposed on the downstream side in the transferring direction and two end sections thereof are disposed on the upstream side. 
     (4) The film forming tank may include two or more than two pipe type showers (the second supply units). 
     (5) The substrate processing device may include two or more cleaning tanks. 
     (6) IPA (the pretreatment material) may be supplied from the pipe type shower (the second supply unit) with any other methods such as spraying. 
     (7) One tank may be divided into cleaning tank sections to provide cleaning tanks. 
     (8) The cleaning tank may include a ultrasonic shower, bubble jetting, cavitation jetting, high-pressure spray shower, and a two-fluid type according to a desired effect of removal of foreign obstacles.