WO2015145817A1 - 塗布装置、塗布方法および塗膜つき樹脂フィルムの製造方法 - Google Patents
塗布装置、塗布方法および塗膜つき樹脂フィルムの製造方法 Download PDFInfo
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- WO2015145817A1 WO2015145817A1 PCT/JP2014/074715 JP2014074715W WO2015145817A1 WO 2015145817 A1 WO2015145817 A1 WO 2015145817A1 JP 2014074715 W JP2014074715 W JP 2014074715W WO 2015145817 A1 WO2015145817 A1 WO 2015145817A1
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- coating
- support
- weir
- bar
- coating bar
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0808—Details thereof, e.g. surface characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
- B05D3/0227—Pretreatment, e.g. heating the substrate with IR heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
- B05D2252/02—Sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/008—Wide strips, e.g. films, webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
- B29L2009/005—Layered products coated
Definitions
- the present invention relates to a coating apparatus and a coating method.
- a rod coating method as a method for uniformly applying a coating liquid to the surface of a web such as a thermoplastic resin film to be conveyed.
- This is a method in which a coating bar extending in the width direction of the web is pressed against the lower surface of the traveling web, and an excessive amount of coating liquid previously supplied to the web is scraped (measured) with the coating bar.
- the coating bar is rotated by a frictional force generated between the coating bar and the web, or a driving force applied by a motor or the like.
- the coating bar is generally in the form of a long rod having a diameter of several tens mm and a length of several hundred mm to several thousand mm, the coating bar is likely to be bent due to its own weight or a reaction force received from the web.
- a method of preventing this bending as disclosed in Patent Document 1, a method of supporting a coating bar from below with a support having a V-shaped cross section extending in the width direction of the coating bar is known. It has been. However, in this method, the coating bar may cause a rotation failure due to friction with the support having a V-shaped cross section, resulting in streak-like defects. Also, in this method, the support having a V-shaped cross section is worn by the rotation of the coating liquid adhering bar and the measuring bar, and this abrasion powder is applied to the web together with the coating liquid, resulting in foreign matter defects. There was also.
- a coating apparatus having a rotatable roller as a supporting means is known.
- a plurality of support means are intermittently arranged in the longitudinal direction of the coating bar, and a roller is rotatably installed on each support means in a form of a pair on the upstream side and the downstream side in the web conveyance direction.
- the coating bar with a thin coating liquid remaining on the surface and the rotatable support rotate in contact with each other, so that bubbles are caught at the contact portion between the two, and the bubbles are coated. It was applied to the web together with the coating liquid remaining on the surface of the bar, and then peeled off on the web.
- Patent Documents 3 and 4 there is a coating apparatus in which a rotatable support body that supports a coating bar is disposed in a container and the container is filled with a coating liquid.
- the coating liquid is supplied into the container, and coating is performed while the coating liquid leaks from a gap formed between the tips of the upper and downstream covers constituting the upper part of the container and the surface of the coating bar.
- the coating bar is disposed in the vicinity of the liquid surface of the coating liquid filled in the container, and the coating liquid in the container is scraped up and applied by rotation of the coating bar.
- this apparatus since the contact portion between the coating bar and the rotatable support is submerged in the coating liquid, it is difficult for air bubbles to be caught.
- Patent Documents 3 and 4 disclose techniques for suppressing the undulation of the liquid surface due to the accompanying flow.
- Patent Document 3 discloses a technique for installing an elastic blade near the liquid surface. Since the accompanying flow generated by the rotating support is blocked by the elastic blade before reaching the liquid level, fluctuations in the liquid level can be suppressed.
- Patent Document 4 discloses a technique for installing a weir adjacent to the coating bar on the rotating support. The accompanying flow is blocked by the weir, and the fluctuation of the liquid level can be suppressed.
- JP 2003-275743 A Japanese Utility Model Publication No. 2-45174 JP 2010-75777 A JP 2008-238082 A
- FIG. 10 is a schematic view of the coating bar surface.
- a groove is formed on the surface of the coating bar by winding a wire 10 around a rod 9.
- FIG. 9 is an enlarged view of the vicinity of the coating bar of Patent Document 3.
- the coating bar 1 supported by the support body 2 is pressed against the web 8 to be conveyed and rotated.
- the support 2 is rotated by the coating bar 1 and an accompanying flow 4 is generated. Since the accompanying flow 4 is blocked by the elastic blade 11, the pulsation of the liquid surface 41 is suppressed.
- the bubbles 6 in the coating liquid reach the vicinity of the surface of the coating bar 1 by the accompanying flow 4 of the support 2 as shown in FIG. To do. Thereafter, the bubbles 6 are entrained in the accompanying flow 5 of the coating bar and are captured by the grooves of the coating bar 1 at the contact points 7. The trapped bubbles 6 are carried to the surface of the web by the rotation of the coating bar 1 and applied to the web surface. As a result, a web-like defect may occur in the web.
- the bubbles 6 may reach the lower surface of the elastic blade 11 by the accompanying flow 4. In this case, the bubbles 6 are caught in the accompanying flow 5 of the coating bar while staying on the lower surface of the elastic blade. A coating-like defect may occur.
- FIG. 11 is an enlarged view of the vicinity of the coating bar of Patent Document 4.
- the coating bar 1 supported by the support body 2 is pressed against the web 8 to be conveyed and rotated. Since the accompanying flow 4 is blocked by the weir 3, the pulsation of the liquid surface 41 is suppressed. However, since the weir 3 does not prevent the accompanying flow itself, the bubbles 6 in the coating liquid flow between the weir 3 and the support 2 by the accompanying flow 4 of the support 2 as shown in FIG.
- the present invention provides a coating apparatus and a coating method that can prevent the entrainment and entrainment of bubbles in an application portion and suppress the occurrence of coating defects caused by bubbles.
- the coating apparatus of the present invention that solves the above problems is as follows.
- a container having a coating liquid inlet; An upstream upper end and a downstream upper end forming an opening having a longitudinal direction in the longitudinal direction of the container at the upper part of the container;
- a rotatable coating bar provided in the opening so as to be sandwiched between the tip of the upper end on the upstream side and the tip of the upper end on the downstream side, and arranged with the rotation axis direction in the longitudinal direction of the opening; ,
- a plurality of pairs arranged intermittently along the longitudinal direction of the coating bar, and a rotatable support that supports the coating bar from below in the container, A weir proximate to the outer peripheral surface of the at least one support,
- the straight line extending from the shaft center of the support and contacting the weir adjacent to the support is L1, the point of contact between the L1 and the weir closest to the shaft center of the support A, and L1 and the outer peripheral surface of the support When the intersection point with
- the “upstream side” of the coating apparatus is the side that is directed in the direction in which the web is conveyed when the coating apparatus is installed in the web conveyance line.
- the “downstream side” of the coating apparatus is a side directed in the direction in which the web is transported when the coating apparatus is installed on the web transport line.
- the coating method of this invention which solves the said subject is as follows. Using the coating apparatus of the present invention, while supplying the coating liquid from the coating liquid introduction port to the container, the coating bar is immersed in the coating liquid, and the web is conveyed from the upstream side to the downstream side at a predetermined speed. A coating method in which the coating bar is pressed and the coating liquid drawn up by the coating bar is applied to the web.
- the manufacturing method of the resin film with a coating film of this invention is as follows.
- a coating solution is formed by applying a coating liquid on the surface of the resin film by the coating method of the present invention.
- a method for producing a resin film is as follows.
- the manufacturing method of the resin film with a coating film of another form of this invention is as follows.
- the resin film is unwound by an unwinding machine, the coating solution is applied to the surface of the unwound resin film by the coating method of the present invention to form a coating film, and the resin film on which the coating film is formed is wound up.
- the coating apparatus and the coating method of the present invention as described below, even when bubbles are mixed in the coating liquid filled in the coating apparatus, the bubbles are prevented from being caught in the coating bar, By discharging the leakage from the coating apparatus together with the leaked coating liquid, it is possible to suppress the occurrence of coating defects caused by bubbles.
- the preferred coating apparatus and coating method of the present invention it is possible to effectively prevent the pulsation of the liquid level, thereby preventing the entrainment of bubbles in the coated portion and suppressing the occurrence of coating defects caused by bubbles. it can.
- FIG. 1 is a schematic sectional view of an embodiment of the present invention.
- FIG. 2 is a top view of FIG. 1 viewed from the Z direction.
- FIG. 3 is an enlarged view of FIG.
- FIG. 4 is a side view of FIG. 2 viewed from the W direction.
- FIG. 5 is a schematic cross-sectional view showing another embodiment of the present invention.
- FIG. 6 is an enlarged view of FIG.
- FIG. 7 is an enlarged view of the vicinity of the coating bar of the embodiment in which the straight line L2 intersects the coating bar.
- FIG. 8 is a schematic cross-sectional view showing another embodiment of the present invention.
- FIG. 9 is an enlarged view of the vicinity of the coating bar of the coating apparatus of Patent Document 3.
- FIG. 10 is a schematic view of the coating bar surface.
- FIG. 10 is a schematic view of the coating bar surface.
- FIG. 11 is an enlarged view of the vicinity of the coating bar of the coating apparatus of Patent Document 4.
- FIG. 12 is a schematic view showing an embodiment of a web manufacturing process.
- FIG. 13 is a schematic view showing a process when coating is performed in-line in the web manufacturing process of FIG.
- FIG. 14 is a schematic cross-sectional view of another embodiment of the present invention.
- FIG. 1 is a schematic sectional view of an embodiment of the present invention
- FIG. 2 is a top view of FIG. 1 viewed from the Z direction
- FIG. 3 is an enlarged view of FIG. 1
- FIG. 4 is a side view of FIG. It is.
- the coating apparatus of this embodiment includes a container 31 having a coating liquid inlet 30, a coating bar 1 immersed in the coating liquid 32, and a rotation for supporting the coating bar 1 from below.
- a possible support 2 has a shaft center 13a on the upstream side in the conveyance direction of the web 8 with respect to the shaft center 12 of the coating bar 1, and a support 2a that supports the coating bar 1 from below the upstream side, and a coating bar 1 has a shaft center 13b on the downstream side in the conveyance direction of the web 8 and a support 2b that supports the coating bar 1 from the lower side on the downstream side (reference numerals 12, 13a, 13b). Is shown in FIG.
- an upstream upper end 33 and a downstream side are located upstream and downstream in the conveying direction of the web 8 with respect to the coating bar 1 (shown by arrows at the end of the web 8 in FIG. 1).
- the upstream upper end portion 33 and the downstream upper end portion 34 form an opening having a longitudinal direction in the longitudinal direction of the container 31 (in this embodiment, the Y direction of the coordinate axis shown in FIG. 2).
- the coating bar 1 is arranged in the opening with the rotation axis direction in the longitudinal direction of the opening (in this embodiment, the Y direction of the coordinate axis shown in FIG. 2).
- the upstream upper end 33 and the coating bar 1 form a first gap 35, and the downstream upper end 34 and the coating bar 1 form a second gap 36.
- a weir 37 close to the outer peripheral surface of the support 2 b is installed on the bottom surface of the container 31.
- the coating bar 1 is rotatably supported by bearings or the like (not shown) at both ends. Further, as shown in FIG. 2, the coating bar 1 is circumscribed and supported from below by a rotatable support body 2 that is intermittently disposed along the longitudinal direction of the coating bar 1. The coating bar 1 is pressed against the web 8 conveyed from the upstream side to the downstream side at a predetermined speed and is driven to rotate. The support 2 supporting the coating bar 1 is also rotated by the coating bar 1.
- the coating liquid 32 is sequentially supplied from a coating liquid introduction port 30 by a coating liquid supply means (not shown) to fill the inside of the container, and a part of the coating liquid 32 is scraped up by the coating bar 1. To be applied.
- the remaining coating liquid 32 sequentially leaks out of the container from the first gap 35, the second gap 36, and the gap 38 (shown by hatching in FIG. 4) between the container side surface and the coating bar 1.
- the coating liquid supply means a gear pump, a diaphragm pump, or a Mono pump having quantitativeness and low pulsation is preferable. Moreover, you may supply the coating liquid discharged from the pump to a container via a filter or a defoaming means. Moreover, you may supply the coating liquid to a container from several places in a container.
- first gap 35 and the second gap 36 (both shown in FIG. 1) and the gap 38 (shown in FIG. 4) between the container side surface and the coating bar 1 are small portions where the coating liquid leaks.
- the first gap 35 is preferably 3 mm or less, and the second gap 36 is preferably 2 mm or less.
- the weir 37 may be installed along the outer peripheral surface of the support body 2b. Further, as shown in FIG. 3, the weir 37 has a straight line extending from the shaft center 13 b of the support 2 b and contacting the weir 37, the point closest to the shaft center of the support 2 b among the contact points of L ⁇ b> 1 and L ⁇ b> 1 and the weir 37. A, L1 and the intersection of the outer peripheral surface of the support 2b with B, the straight line L1 passing through the midpoint of the line segment AB and perpendicular to the axial direction of the straight line L1 and the support 2b is the coating bar. It is preferable to install so as not to intersect.
- the straight line L ⁇ b> 1 is a straight line extending downward from the axial center 13 b of the support body 2 b toward the downstream side with the axial center 13 b as a fulcrum and contacting the weir 37.
- FIG. 6 is an enlarged view of FIG. 1
- FIG. 7 is an enlarged view of the vicinity of the coating bar of the embodiment in which L2 intersects the coating bar.
- the bubbles 44 released from the end portion of the flow path formed by the weir 37 and the support 2 b flow in the container and are not captured by the groove of the coating bar 1.
- the liquid level 41 flows out of the apparatus.
- the bubbles 44 released from the end of the flow path formed by the weir 37 and the support 2b flow toward the coating bar 1, It is caught in the accompanying flow 5 and supplemented by the groove of the coating bar 1 at the contact 7.
- the captured bubbles 44 reach the application surface by the rotation of the coating bar 1 and are applied to the web surface. As a result, a web-like defect may occur in the web.
- the gap between the weir 37 and the outer peripheral surface of the support 2b is at least partially 2 mm or less on the downstream side in the conveyance direction of the web 8 from the vertical line 50 (shown in FIG. 1) passing through the axial center 13b of the support 2b.
- the “downstream side of the vertical line 50” includes the vertical line 50 as well.
- the accompanying flow 40 generated by the rotation of the support 2b is blocked by the weir 37, and the pulsation of the liquid surface 41 can be prevented. If the gap is too large, the effect of blocking the accompanying flow may be reduced. Further, if the position where the gap is 2 mm or less is located upstream of the vertical line 50 in the conveyance direction of the web 8 but is not located downstream of the conveyance direction, the accompanying flow occurs on the outer peripheral surface of the support 2b downstream of the vertical line 50. May occur again, and the liquid level 41 may pulsate.
- the gap between the weir 37 and the outer peripheral surface of the support 2b is 2 mm or less is on the downstream side of the vertical line 50, the position where the gap is 2 mm or less on the upstream side of the vertical line 50 is present. There may be.
- the gap be 0.1 mm or more. When the gap is 0.1 mm or more, contact between the weir 37 and the support 2b can be prevented even if the rubber or the like on the surface of the support 2b swells with the coating liquid.
- the dam 37 may be installed close to at least one of the plurality of supports 2b in the web width direction.
- the end in the width direction of the web or the like may not be used as a product in the end, and there may be no problem even if such a coating-like defect occurs.
- the weir 37 may be installed close to only the support 2b in a range where it is finally used as a product. More preferably, the weir 37 is installed close to all the supports 2b. By doing so, it is possible to prevent the defect of coating omission due to air biting in the entire film width.
- the weir 37 may be installed on the side surface of the container 31 as shown in FIG. In this case, it is preferable that the lower surface of the weir 37 is inclined from the horizontal to the upper side from the side surface side of the container 31 to the support side so that bubbles and coating liquid do not stay on the lower surface of the weir 37.
- the weir 37 may be integrated with the container 31 constituting the coating device, the upper end 34 on the downstream side, or the like, or may be fixed with a bolt or the like so that it can be removed.
- integration means a case where the weir 37 is attached to the container 31 by welding or the like, or a case where the container 31 and the weir 37 are formed by cutting a single member. Further, the weir 37 may be configured such that the gap with the support can be adjusted.
- the weir 37 may be intermittently installed in the width direction of the web 8 as shown in FIG. 2, or continuously installed in the width direction of the web 8 so as to connect the weirs 37 of FIG. Also good.
- the length 45 in the web width direction of the weir 37 is more than the length 46 in the web width direction of the support 2 b in order to reliably dam the accompanying flow by the support 2 b. It is preferable to increase the size.
- the weir 37 may be installed close to the support 2a.
- the accompanying flow that causes pulsation of the liquid surface 41 is mainly generated by the support 2b on the downstream side in the film transport direction, so it is effective to install the weir 37 in the vicinity of the support 2b.
- the pulsation of the liquid level 41 can be further reduced by installing it close to the support body 2a on the upstream side in the transport direction.
- the weir 37 When the weir 37 is installed close to the support 2a, it may be installed similarly to the case where the weir 37 is installed close to the support 2b as described above.
- the coating bar 1 for example, a rod, a wire bar in which a wire is wound around the outer peripheral surface of the rod to form a groove, a rolled rod in which a groove is formed on the outer peripheral surface of the rod by rolling, or the like can be used.
- the material of the coating bar 1 is preferably stainless steel, particularly SUS304 or SUS316.
- the surface of the coating bar 1 may be subjected to a surface treatment such as hard chrome plating. If the diameter of the coating bar 1 is large, stripe-shaped coating defects along the conveying direction called rib stripes are likely to occur. If the diameter is small, the deflection of the coating bar 1 is large, and therefore it is preferably 10 to 20 mm.
- the coating bar 1 is pressed against the web 8 and rotated by frictional force with the web 8, so-called driven rotation, but may be rotated by a driving device such as a motor.
- the coating bar When rotated by the driving device, the coating bar is preferably rotated at substantially the same speed as the web conveyance speed in the web conveyance direction in order to prevent the web from being damaged.
- substantially substantially the same speed means that the speed difference between the peripheral speed of the coating bar and the web conveyance speed is rotated by ⁇ 10% or less.
- the coating bar may be rotated at a speed different from the web conveyance speed, or may be rotated in the direction opposite to the web conveyance direction.
- the support 2 may be any material such as a roller or a ball that supports the coating bar while rotating.
- the support 2 is preferably made of a material having a lower hardness than the coating bar 1 for the surface layer in order to reduce wear of the coating bar 1.
- the material for the surface layer it is preferable to use synthetic rubber or elastomer.
- the elastomer refers to a rubber-like elastic resin that can be melt-molded by an injection molding method, an extrusion molding method, a casting molding method, a blow molding method, an inflation molding method, or the like.
- urethane elastomer As the elastomer, urethane elastomer, polyester elastomer, polyamide elastomer and the like are preferable, and it is particularly preferable to use a thermoplastic polyurethane elastomer excellent in wear resistance and mechanical strength.
- the thickness of the elastomer formed on the surface layer of the support 2 is preferably 0.5 to 6 mm.
- the hardness of the elastomer is preferably 60 to 98A (measured according to the standard of JIS K6253 in 1996).
- the support 2 is preferably disposed on both the upstream side and the downstream side of the coating bar 1 with respect to the conveyance direction of the web 8 as in the present embodiment. Moreover, you may arrange
- an angle formed by a line connecting the axis center 13a of the support 2a disposed on the upstream side of the coating bar 1 with respect to the conveyance direction of the web 8 and the axis center 12 of the coating bar 1 with the vertical direction is ⁇ 1.
- a line connecting the axis center 13b of the support 2b disposed on the downstream side of the coating bar 1 and the axis center 12 of the coating bar 1 with respect to the conveyance direction of the web 8 is the vertical direction. If the angle between the two is ⁇ 2 (shown in FIG. 1), both ⁇ 1 and ⁇ 2 are preferably 10 degrees or more. If the angles ⁇ 1 and ⁇ 2 are too small, the coating bar 1 may vibrate due to the vibration of the web 8 and a coating defect may occur.
- the support 2 preferably has a structure having a bearing so as to rotate smoothly. Since the support 2 is immersed in the coating liquid, the material of the bearing is preferably a material that is highly corrosive to the coating liquid, and more preferably waterproof.
- the diameter of the support 2 is preferably 8 mm or more because a commercially available bearing can be used. Further, the length of the support 2 in the axial direction is preferably 3 to 25 mm in order to reduce the generated accompanying flow and to use a general-purpose bearing.
- the arrangement interval of the supports 2 arranged along the longitudinal direction of the coating bar 1 is small because the deflection of the coating bar 1 becomes large if it is too large.
- the coating bar 1 may be disposed so that the deflection of the coating bar 1 is 10 ⁇ m or less.
- the amount of flexure is an evenly distributed weight applied to the coating bar 1 by the reaction force in the out-of-plane direction of the web 8 calculated from the tension applied in the traveling direction of the web 8 and the winding angle ⁇ of the web 8 with respect to the coating bar 1.
- the support 2 may be used as a support point, and it may be obtained from an equation of material mechanics using the cross-sectional second moment and Young's modulus of the coating bar 1.
- Examples of the material of the support 37 include metals such as iron, stainless steel, aluminum, and copper, synthetic fats such as nylon, acrylic resin, vinyl chloride resin, and tetrafluoroethylene, or rubber.
- the shape may be a plate shape or a block shape.
- the upstream upper end portion 33 shown in FIG. 1 is preferably inclined by 10 ° or more and 90 ° or less downward from the horizontal as at least a part thereof is separated from the opening side in the upstream direction.
- the downstream upper end 34 is preferably inclined by 10 ° or more and 90 ° or less downward from the horizontal as at least a part thereof is separated from the opening side in the downstream direction.
- the viscosity of the coating liquid is preferably 0.1 Pa ⁇ s or less.
- the viscosity of the coating liquid is a value measured according to the standard of JIS Z8803 in 1996.
- a rheometer RC20 manufactured by Rheotech
- the temperature of the coating liquid in the actual application portion is ideal to use the temperature of the coating liquid in the actual application portion as the measurement condition, but it is difficult to accurately know the temperature of the coating liquid in the application portion. Therefore, the temperature of the coating liquid in a coating liquid supply means (not shown) such as a liquid feeding tank may be substituted.
- the rotating peripheral speed of the coating bar is preferably 150 m / min or less. When the rotational peripheral speed is high, coating stripes are likely to occur.
- the coating amount of the coating liquid is preferably 2 to 100 g / m 2 in a wet state immediately after coating, and more preferably 4 to 50 g / m 2 .
- the coating amount can be adjusted by the size of the groove formed in the coating bar.
- the coating bar is a wire bar
- the wire diameter of the wire to be wound is changed.
- the coating bar is a rolling rod
- the groove is rolled with a die having a different groove depth and / or groove pitch. Can be changed.
- coating by this embodiment may be implemented in-line with respect to the web in film forming, and may be implemented offline with respect to the manufactured web.
- FIG. 12 is a schematic diagram showing an embodiment of a resin film manufacturing process
- FIG. 13 is a schematic diagram of a process when applying inline in the resin film manufacturing process of FIG.
- the resin film manufacturing process shown in FIG. 12 includes an extruder 200, a base 201, a casting drum 202, a longitudinal stretching machine 203, a lateral stretching machine 204, and a winding roll 205.
- the polymer is extruded by the extruder 200, and the polymer is formed into a sheet through the die 201 and the casting drum 202.
- the formed resin film is stretched vertically and horizontally by a longitudinal stretching machine 203 and a lateral stretching machine 204.
- the stretched resin film is continuously wound up by a winding roll 205.
- a coating device 206 is installed between the longitudinal stretching machine 203 and the lateral stretching machine 204, and the resin film after longitudinal stretching is applied to the resin film. Apply.
- an example of a sequential biaxial stretching method in which transverse stretching is performed after longitudinal stretching has been shown, but the present coating apparatus may be installed before the simultaneous biaxial stretching method.
- the wound resin film is once unwound by an unwinder, and an application device is installed in the middle of rewinding by the winder to apply to the resin film.
- Example 1 A chip of polyethylene terephthalate (hereinafter abbreviated as PET) having an intrinsic viscosity (also called intrinsic viscosity) of 0.62 dl / g (measured in o-chlorophenol at 25 ° C. according to the standard of JIS K7367 in 1996) at 180 ° C. Fully vacuum dried. The vacuum-dried chip was supplied to the extruder 200 shown in FIG. 13 and melted at 285 ° C. The molten polymer was extruded into a sheet form from a T-shaped base 201, wound around a mirror cast drum 202 having a surface temperature of 23 ° C. using an electrostatic application casting method, and cooled and solidified to obtain an unstretched film.
- PET polyethylene terephthalate
- the unstretched film was heated with a roll group heated to 80 ° C., and further stretched 3.2 times in the longitudinal direction while being heated with an infrared heater, and a cooling roll adjusted to 50 ° C. It cooled and set it as the resin film of uniaxial stretching.
- the width of the resin film was 1700 mm.
- the coating apparatus 32 of FIG. 1 was used as the coating apparatus 206, and the coating liquid 32 was applied to the lower surface of the resin film traveling at a speed of 70 m / min.
- the transverse stretching machine 204 the resin film coated with the coating liquid 32 is introduced into a 90 ° C.
- the coating liquid 32 is dried in the 100 ° C. oven, and the resin film is moved in the width direction.
- the resin film was stretched 3.7 times, and further heat-fixed with a 5% relaxation treatment in the width direction in an oven at 220 ° C.
- the tension between the longitudinal stretching machine 203 and the lateral stretching machine 204 was controlled by a dancer roll so that the tension per unit width in the running direction of the resin film was 8000 N / m.
- the coating liquid 32 is an emulsion of polyester copolymer (containing components: 90 mol% terephthalic acid, 10 mol% 5-sodium sulfoisophthalic acid, 96 mol% ethylene glycol, 3 mol% neopentyl glycol, 1 mol% diethylene glycol) 100 mass 5 parts by weight of a melamine-based cross-linking agent (imino group-type methylated melamine diluted with a mixed solvent of 10% by weight of isopropyl alcohol and 90% by weight of water) and colloidal silica particles having an average particle size of 0.1 ⁇ m Was added to 1 part by mass.
- the viscosity of the coating liquid 32 was 2 mPa ⁇ s at a temperature of 25 ° C.
- This coating solution was supplied to the container 31 at 17 kg / min by a diaphragm pump (manufactured by Takumina Co., Ltd.).
- the coating liquid introduction port 30 was provided at one place and installed in the container 31 as shown in FIGS.
- the coating bar 1 used was a round bar made of stainless steel having a diameter of 12.7 mm and a length of 1850 mm, and a wire having a linear shape of 0.1 mm (manufactured by Kano Shoji Co., Ltd.).
- the support 2 was a roller having a diameter of 22 mm and an axial length of 14 mm, and a thermoplastic polyurethane elastomer having a hardness of 95 A was applied to the surface with a thickness of 2 mm.
- Eight supports 2 were arranged at a pitch of 470 mm in the longitudinal direction of the coating bar 1. At that time, they were arranged in a staggered manner on the upstream side and downstream side of the coating bar with respect to the direction of transport of the resin film.
- the angles ⁇ 1 and ⁇ 2 shown in FIG. 1 are both arranged to be 15 degrees.
- the support 2 was configured to be freely rotatable in the circumferential direction and restrained in the axial direction and the vertical direction.
- the coating bar 1 is supported by a support 2 and bearings at both ends so as to be rotatable in the circumferential direction, pressed against a horizontally transported resin film to a winding angle ⁇ of 10 degrees, and driven in the same direction as the resin film transport direction. Rotated.
- the first gap 35 and the second gap 36 were 3 mm and 2 mm, respectively.
- the leakage portion of the coating liquid other than the first gap 35 and the second gap 36 is only the gap 38 (shown in FIG. 4) between the container side surface and the coating bar.
- the gap 38 has a cross-sectional area as confirmed in the drawing. It was 55 mm 2 .
- An acrylic plate having a thickness of 1 mm was used as the upstream upper end 33 and the downstream upper end 34.
- the upstream upper end portion 33 was attached in a state where it was inclined 15 ° downward from the horizontal direction as it moved away from the opening side in the upstream direction.
- the upper end 34 on the downstream side was also attached in a state inclined 15 ° downward from the horizontal direction as it moved away from the opening side in the downstream direction.
- the weir 37 As the weir 37, a plate made of SUS304 was used. As shown in FIG. 1, the weir 37 was installed on the downstream side of the support 2b in the film transport direction so that the gap 42 was 3 mm. The weir 37 was installed so that the height thereof was the same as the axial center 13b of the support 2b as shown in FIG. 3, and was intermittently installed in the film width direction as shown in FIG. The length of the weir 37 in the film conveyance direction was 5 mm, the length in the film width direction (45 in FIG. 2) was 20 mm, and the weir 37 was installed so as to protrude 3 mm from both end surfaces in the axial direction of the support 2b (51 in FIG. 2). 52 was 3 mm each).
- a resin film stretched to 5735 ⁇ 70 mm with a transverse stretcher after coating was sampled for a length of 3 m in the transport direction, and this sample was applied by visual observation by applying a three-wavelength fluorescent lamp in a dark room.
- the fault was confirmed.
- the coating missing defect can be confirmed as an elliptical defect (major axis: 1 to 10 mm, minor axis: 0.3 to 3 mm) because spherical bubbles are applied to the resin film together with the coating solution and then stretched laterally.
- this portion has a thin coating thickness, it can be confirmed as color unevenness under a three-wavelength fluorescent lamp.
- the number of defects in the sample was counted per 1 m 2 by counting the number in the sample.
- Example 2 Application was carried out in the same manner as in Example 1 except that the gap 42 between the weir and the support was 2 mm. As a result, no pulsation of the liquid level 41 on the downstream side in the transport direction of the resin film was observed. The coating missing defect was a small amount of 1.7 pieces / m 2 , which was a quality that can be shipped as a product.
- Example 3 Application was performed in the same manner as in Example 1 except that the weir 37 was installed directly below the support 2b as shown in FIG. 14 and the gap 42 with the support 2b was set to 2 mm. As a result, no pulsation of the liquid level 41 on the downstream side in the transport direction of the resin film was observed. The coating omission defect was 4.7 pieces / m 2 , which was a quality that can be shipped as a product.
- Example 4 In Example 1, the weir was not installed on the support 2b but on the downstream side in the film transport direction of the support 2a in the same manner for coating. As a result, the pulsation of the liquid surface 41 on the downstream side in the transport direction of the resin film was slightly worse than that in Example 1, but the coating omission defect was a small amount of 4.5 pieces / m 2 , which is a quality that can be shipped as a product. there were.
- Example 5 In Example 1, coating was performed by removing the weirs at both ends in the film width direction. As a result, the pulsation of the liquid surface 41 on the downstream side in the transport direction of the resin film occurred in the rollers at both ends from which the weir was removed. As a result of inspecting the collected sample, in the sample having a width of 5375 mm, the portion with both ends of 115 mm had a large number of coating omission defects of 18.3 pieces / m 2 , but the other portion was a small amount of 4.0 pieces / m 2 . There was a part other than 115 mm at both ends, which could be shipped as a product.
- Example 1 Application was performed in the same manner as in Example 1 except that a weir as shown in FIG. 7 was used as the weir.
- This weir is shaped like the weir of Example 1 along the outer peripheral surface of the support 2b in a section having an angle ⁇ 3 in the rotation direction of the support 2b from the horizontal line passing through the axial center 13b of the support 2b. A part to be placed close to each other is added.
- ⁇ 3 was 45 degrees
- the gap between the support and the weir was 2 mm in the section of ⁇ 3.
- pulsation of the liquid level 41 on the downstream side in the transport direction of the resin film was not observed, but 7.0 defects / m 2 was generated as a coating missing defect, which was a quality that could not be shipped as a product.
- Example 3 Application was performed in the same manner as in Example 1 except that the weir 37 was not provided and the weir disclosed in Patent Document 4 was installed as shown in FIG.
- the gap between the coating bar 1 and the tip of the weir 3 was 1 mm
- the inclination angle between the weir 3 and the horizontal line was 15 degrees
- the shortest distance between the outer peripheral surface of the support 2 and the surface of the weir 3 was 3 mm.
- the weir 3 was a stainless steel plate having a thickness of 0.5 mm, and was installed so as to extend over the entire width in the longitudinal direction of the container.
- Example 4 Application was performed in the same manner as in Example 1 except that no weir was provided. As a result, the liquid level 41 on the downstream side in the conveyance direction of the resin film pulsates as compared with Example 1, and 19.1 pieces / m 2 were found in the sample after application, and the defect that the product could not be shipped as a product. there were.
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Abstract
Description
塗液導入口を有する容器と、
前記容器の上部に容器の長手方向に長手方向を有する開口部を形成する上流側上端部および下流側上端部と、
前記開口部に前記上流側上端部の先端と前記下流側上端部の先端とに挟まれるように設けられ、開口部の長手方向に回転軸方向を向けて配置された回転可能な塗工バーと、
前記塗工バーの長手方向に沿って間欠的に複数対配置され、前記容器内で塗工バーを下方から支持する回転可能な支持体と、
少なくとも1つの前記支持体の外周面に近接する堰と、を有し、
前記支持体の軸中心から延びてこの支持体に近接する堰に接する直線をL1、L1と堰との接点のうち支持体の軸中心に最も近い点をA、およびL1と支持体の外周面との交点をBとすると、線分ABの中点を通り直線L1および支持体の軸方向と垂直な直線L2が前記塗工バーと交差せず、
前記直線L1は、前記支持体の軸中心から鉛直方向上側に延びた直線を、この軸中心を支点として下流側へ倒していき、この支持体に近接する堰に接触させた直線である、塗布装置。
本発明の塗布装置を用い、前記容器に前記塗液導入口から塗液を供給しつつ、この塗液に前記塗工バーを浸し、所定の速度で上流側から下流側へ搬送されるウェブに前記塗工バーを押し当て、前記塗工バーでかきあげた前記塗液を前記ウェブに塗布する、塗布方法。
押出機によりポリマーを押し出し、このポリマーをシート状に成形して樹脂フィルムとする工程において、本発明の塗布方法で前記樹脂フィルムの表面に塗液を塗布して塗膜を形成する、塗膜つき樹脂フィルムの製造方法。
巻出機で樹脂フィルムを巻き出し、この巻き出された樹脂フィルムの表面に本発明の塗布方法で塗液を塗布して塗膜を形成し、この塗膜が形成された樹脂フィルムを巻取機で巻き取る、塗膜つき樹脂フィルムの製造方法。
まず、本実施形態の装置構成について説明する。図1は、本発明の一実施形態の概略断面図、図2は図1をZ方向からみた上面図、図3は図1の拡大図、図4は図2をW方向から見た側面図である。
図5に示すように、堰37は支持体2bの外周面に沿うように設置されていてもよい。また、図3に示すように、堰37は、支持体2bの軸中心13bから延びて堰37に接する直線をL1、L1と堰37との接点のうち支持体2bの軸中心に最も近い点をA、L1と支持体2bの外周面との交点をBとすると、線分ABの中点を通り、直線L1および支持体2bの軸方向のそれぞれと垂直な直線L2が前記塗工バーと交差しないように設置されるのが好ましい。ここで、直線L1は、支持体2bの軸中心13bから鉛直方向上側に延びた直線を、この軸中心13bを支点として下流側へ倒していき、堰37に接触させた直線である。このようにすることで、塗液中に気泡が混入しても、それらがウェブ8に塗布されることを防止できる。これについて図6および図7を用いて説明する。
塗工バー1としては、例えばロッド、ロッドの外周面にワイヤーを巻いて溝を形成したワイヤーバー、ロッドの外周面に転造加工で溝を形成した転造ロッドなどを用いることができる。塗工バー1の材質はステンレスが好ましく、特にSUS304またはSUS316が好ましい。塗工バー1の表面にはハードクロムメッキなどの表面処理を施してもよい。塗工バー1の直径は、大きいとリブスジと呼ばれる搬送方向に沿ったスジ状の塗布欠点が発生しやすくなり、小さいと塗工バー1の撓みが大きくなるため、10~20mmが好ましい。また、本実施形態では、塗工バー1をウェブ8に押し当て、ウェブ8との摩擦力によって回転する、いわゆる従動回転の状態であるが、モーター等の駆動装置によって回転させてもよい。駆動装置によって回転させる場合、ウェブに傷が入ることを防止するため、塗工バーはウェブの搬送方向にウェブの搬送速度と実質的にほぼ同一の速度で回転させることが好ましい。ここで、「実質的にほぼ同一の速度」とは、塗工バーの周速とウェブの搬送速度との速度差を±10%以下で回転させることを言う。ただし、製品の用途等により、ウェブの傷が問題にならない場合は塗工バーをウェブの搬送速度と異なる速度で回転させたり、あるいは、ウェブの搬送方向と逆方向に回転させてもよい。また、図1に図示した、塗工バー1に対する巻き付け角度αは、小さすぎるとウェブのバタツキや振動による横ダン状の塗布欠点が発生し、逆に大きすぎると塗工バー1や支持体2への荷重が増え、塗工バー1の撓みが大きくなったり、支持体2が磨耗することがあるため、2~10度の範囲にすることが好ましい。
支持体2としては、ローラやボール等、回転しながら塗工バーを支えるものであればどのようなものでもよい。また、支持体2は、塗工バー1の摩耗を軽減するため、表層に塗工バー1より硬度が低い材料を用いることが好ましい。表層の材質としては合成ゴムやエラストマを使用することが好ましい。ここで、エラストマとは、射出成形法、押出成形法、注型成型法、ブロー成形法、インフレーション成型法などにより溶融成形ができるゴム状の弾性体樹脂をいう。エラストマとしては、ウレタンエラストマ、ポリエステルエラストマ、ポリアミドエラストマなどが好ましく、特に、耐摩耗性、機械的強度に優れた熱可塑性ポリウレタンエラストマを使用することが好ましい。支持体2の表層に形成するエラストマの厚みは0.5~6mmが好ましい。エラストマの硬度は60~98A(1996年JIS K6253の規格に従い測定)が好ましい。
図1に図示した上流側上端部33は、少なくとも一部が開口部側から上流側方向に離れるにつれて水平から下方に10°以上90°以下だけ傾斜していることが好ましい。下流側上端部34は、少なくとも一部が開口部側から下流側方向に離れるにつれて水平から下方に10°以上90°以下だけ傾斜していることが好ましい。これにより、第1の間隙35および第2の間隙36から漏洩した塗液が上流側上端部33および下流側上端部34の上面に溜まって塗液が変質したり、塗工バー上流側の液だまり39を乱して塗布ムラが発生することを防止できる。
塗液の粘度は0.1Pa・s以下が好ましい。塗液の粘度が高い場合には、塗工バーによって容器内の塗液をかきあげる際に塗液がスジ状になり、ウェブの幅方向に均一に塗布できず、塗布スジが生じることがある。本実施形態において、塗液の粘度は、1996年 JIS Z8803の規格に従い測定した値である。測定機としては、例えばレオメータ(レオテック社製 RC20)を用いることができる。粘度の測定においては、測定条件である塗液の温度は、実際の塗布部における塗液の温度を用いるのが理想ではあるが、塗布部における塗液の温度を正確に知ることは難しい。そこで、送液タンク等の塗液供給手段(図示しない)内の塗液温度で代用するとよい。塗工バーの回転周速は、150m/分以下が好ましい。回転周速が速いと、塗布スジが発生しやすくなる。
本実施形態による塗布は、製膜中のウェブにインラインで実施してもよいし、製造したウェブにオフラインで実施してもよい。
極限粘度(固有粘度ともいう)0.62dl/g(1996年 JIS K7367の規格に従い、25℃のo-クロロフェノール中で測定)のポリエチレンテレフタレート(以下PETと省略する)のチップを、180℃で十分に真空乾燥させた。真空乾燥させたチップを図13の押出機200に供給して285℃で溶融させた。溶融したポリマーをT字型口金201よりシート状に押し出し、静電印加キャスト法を用いて表面温度23℃の鏡面キャストドラム202に巻き付けて冷却固化して未延伸フィルムとした。続いて縦延伸機203において、この未延伸フィルムを80℃に加熱したロール群で加熱し、さらに赤外線ヒータにて加熱しながら長手方向に3.2倍延伸し、50℃に調整した冷却ロールで冷却し、一軸延伸の樹脂フィルムとした。樹脂フィルムの幅は1700mmであった。続いて塗布装置206として図1の塗布装置を用い、速度70m/分で走行するこの樹脂フィルムの下面に塗液32を塗布した。続いて横延伸機204において、塗液32が塗布された樹脂フィルムを90℃のオーブン内に導いて加熱し、引き続き100℃のオーブン内で塗液32を乾燥させ、かつ樹脂フィルムを幅方向に3.7倍延伸し、さらに220℃のオーブン内で幅方向に5%弛緩処理しつつ樹脂フィルムの熱固定を行った。このようにして、片面に塗液32による膜を形成した二軸延伸フィルムを得た。縦延伸機203と横延伸機204の間の張力は、樹脂フィルムの走行方向にかかる単位幅当たりの張力が8000N/mとなるようにダンサーロールで制御した。
堰と支持体との間隙42を2mmとしたこと以外は実施例1と同様にして塗布を行った。その結果、樹脂フィルムの搬送方向下流側の液面41の脈動は見られなかった。塗布抜け欠点は1.7個/m2と少量であり、製品として出荷できる品質であった。
堰37を図14に示すように支持体2bの真下に設置し、支持体2bとの間隙42を2mmとしたこと以外は実施例1と同様にして塗布を行った。その結果、樹脂フィルムの搬送方向下流側の液面41の脈動は見られなかった。塗布抜け欠点は4.7個/m2であり、製品として出荷できる品質であった。
実施例1において、堰を支持体2bではなく支持体2aのフィルム搬送方向下流側に同様に設置して塗布を行った。その結果、樹脂フィルムの搬送方向下流側の液面41の脈動は実施例1に比べて若干悪化したものの、塗布抜け欠点は4.5個/m2と少量であり、製品として出荷できる品質であった。
実施例1において、フィルム幅方向両端部の堰を取り外して塗布を行った。その結果、樹脂フィルムの搬送方向下流側の液面41の脈動は、堰を外した両端部のコロにおいて発生した。採取したサンプルを検査した結果、幅5375mmのサンプルにおいて、両端115mmの部分は塗布抜け欠点が18.3個/m2と多かったが、それ以外の部分は4.0個/m2と少量であり、両端115mm以外の部分は製品として出荷することができた。
堰として、図7に示すような堰を用いた以外は実施例1と同様にして塗布を行った。この堰は、実施例1の堰に、支持体2bの軸中心13bを通る水平線から、支持体2bの回転方向になす角度β3の区間内において、支持体2bの外周面に沿うような形状で近接配置させる部分を追加したものである。この時β3は45度とし、β3の区間において、支持体と堰の間隙は2mmとした。その結果、樹脂フィルムの搬送方向下流側の液面41の脈動は見られなかったが、塗布抜け欠点は7.0個/m2発生し、製品として出荷できない品質であった。
堰37は設けず、特許文献3に開示されている弾性ブレードを図9のように設置した以外は実施例1と同様にして塗布を行った。弾性ブレード11としては、厚みが0.1mmのポリエチレン製フィルムを用い、下流側上端部34の下面に片端を固定し、下流側上端部34の先端から塗工バー1側に突き出すように設置した。その突き出した部分の長さ(塗工バーの長手方法と直交する方向の長さ)は3mmとなるようにし、弾性ブレードの塗工バー側の端部を、図9に示すように、弾性ブレードの上面側が塗工バー1に接するようにして、塗工バー1に押付けた。弾性ブレードのフィルム幅方向の長さは、容器のフィルム幅方向の内寸と同じとし、容器の全幅にわたって延在するように設置した。
堰37は設けず、特許文献4に開示されている堰を図11のように設置した以外は実施例1と同様にして塗布を行った。塗工バー1と堰3先端との間隙は1mmとし、堰3が水平線となす傾斜角は15度、支持体2の外周面と堰3表面との最短距離は3mmとした。堰3は厚みが0.5mmのステンレス板を用い、容器の長手方向全幅に渡って延在するように設置した。
堰を設けないこと以外は実施例1と同様にして塗布を行った。その結果、樹脂フィルムの搬送方向下流側の液面41が実施例1と比較して脈動し、塗布後のサンプルに塗布抜け欠点は19.1個/m2発見され、製品として出荷できない品質であった。
2 支持体
2a 上流側支持体
2b 下流側支持体
3 堰
4 随伴流
5 塗工バーの随伴流
6 気泡
7 塗工バーと支持体の接点
8 ウェブ
9 ロッド
10 ワイヤー
11 弾性ブレード
12 塗工バーの軸中心
13 支持体の軸中心
13a 上流側支持体の軸中心
13b 下流側支持体の軸中心
30 塗液導入口
31 容器
32 塗液
33 上流側上端部
34 下流側上端部
35 第1の間隙
36 第2の間隙
37 堰
38 容器側面と塗工バーとの隙間
39 液だまり
40 随伴流
41 液面
42 堰と支持体との間隙
43 塗液の流れ
44 気泡
45 堰のウェブ幅方向の長さ
46 支持体のウェブ幅方向の長さ
50 鉛直線
51 支持体と堰の長さの差
52 支持体と堰の長さの差
200 押出機
201 口金
202 キャスティングドラム
203 縦延伸機
204 横延伸機
205 巻取りロール
206 塗布装置
a ウェブと塗工バーの接点
A L1と堰との接点
B L1と支持体外周面との接点
L1 堰の終端部と支持体との軸中心を結んだ線
L2 接点Aと接点Bの中心から引いたL1に垂直な線
α 巻き付け角
β1 支持体の設置角度
β2 支持体の設置角度
β3 堰先端と軸中心とを結ぶ線が水平線となす角度
Claims (7)
- 塗液導入口を有する容器と、
前記容器の上部に容器の長手方向に長手方向を有する開口部を形成する上流側上端部および下流側上端部と、
前記開口部に前記上流側上端部の先端と前記下流側上端部の先端とに挟まれるように設けられ、開口部の長手方向に回転軸方向を向けて配置された回転可能な塗工バーと、
前記塗工バーの長手方向に沿って間欠的に複数対配置され、前記容器内で塗工バーを下方から支持する回転可能な支持体と、
少なくとも1つの前記支持体の外周面に近接する堰と、を有し、
前記支持体の軸中心から延びてこの支持体に近接する堰に接する直線をL1、L1と堰との接点のうち支持体の軸中心に最も近い点をA、およびL1と支持体の外周面との交点をBとすると、線分ABの中点を通り直線L1および支持体の軸方向のそれぞれと垂直な直線L2が前記塗工バーと交差せず、
前記直線L1は、前記支持体の軸中心から鉛直方向上流側に延びた直線を、この軸中心を支点として下流側へ倒していき、この支持体に近接する堰に接触させた直線である、塗布装置。 - 前記支持体の軸中心を通る鉛直線よりも下流側において、この支持体に近接する前記堰とこの支持体の外周面との間隙が少なくとも一部分で2mm以下である、請求項1の塗布装置。
- 前記堰が、前記塗工バーを下流側の下方から支持する支持体の少なくとも1つに近接して設置されている、請求項1または2の塗布装置。
- 前記堰が、前記塗工バーを下流側の下方から支持する支持体の全てに近接して設置されている、請求項3の塗布装置。
- 請求項1~4のいずれかの塗布装置を用い、前記容器に前記塗液導入口から塗液を供給しつつ、この塗液に前記塗工バーを浸し、所定の速度で上流側から下流側へ搬送されるウェブに前記塗工バーを押し当て、前記塗工バーでかきあげた前記塗液を前記ウェブに塗布する、塗布方法。
- 押出機によりポリマーを押し出し、このポリマーをシート状に成形して樹脂フィルムとする工程において、請求項5の塗布方法で前記樹脂フィルムの表面に塗液を塗布して塗膜を形成する、塗膜つき樹脂フィルムの製造方法。
- 巻出機で樹脂フィルムを巻き出し、この巻き出された樹脂フィルムの表面に請求項5の塗布方法で塗液を塗布して塗膜を形成し、この塗膜が形成された樹脂フィルムを巻取機で巻き取る、塗膜つき樹脂フィルムの製造方法。
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