JP2005342709A - Coating apparatus and die coater manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus by which a coated product having uniform coating film thickness in the coating width direction and little coating failure can be obtained even when a coating solution is applied after a long period of time and in which a die coater having wide coating width of ≥1 meter is used and to provide the die coater manufacturing method. <P>SOLUTION: This coating apparatus comprises a pocket section for spreading the coating solution to the coating width direction, a coating solution supply port for supplying the coating solution to the pocket section, and a slit section for discharging the coating solution to the object to be coated from the pocket section, and uses the die coater in which at least two bars are incorporated. These bars are suspended while facing the end face of each of them upward, heat-treated in a heat treating furnace, and then ground. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coating apparatus using a die coater in which at least two bars are assembled and manufactured, and a method for manufacturing the die coater. More specifically, the present invention relates to at least two coatings having a stable coating film thickness in the coating width direction. The present invention relates to a coating apparatus using a die coater fabricated by assembling a bar and a method for producing the die coater.

  Conventionally, coating liquids (including undercoat liquids, topcoat liquids, back layer liquids, etc.) for surface treatments such as photographic light-sensitive materials, heat-developable recording materials, ablation recording materials, magnetic recording media, glass plates and steel plates, etc. As a method of applying the coating liquid to the continuously running support, for example, dip coating method, blade coating method, air knife coating method, wire bar coating method, gravure coating method, reverse coating method, reverse roll coating method, extrusion coating method A slide coating method, a curtain coating method, and the like are known.

  Among these coating methods, generally, photographic photosensitive materials, heat-developable recording materials, ablation recording materials, etc. can be applied at high speed, thin film, and multilayer simultaneous coating. The curtain coating method is widely used. As a coating apparatus used for these coating methods, a slide type die coater is used for the slide coating method, an extrusion type die coater is used for the extrusion coating method, and a curtain type die coater is used for the curtain coating method. . In the present invention, it is also called a die coater as a general term for a slide type die coater, an extrusion type die coater and the like.

  As the configuration of these die coaters, for example, in the case of a slide type die coater, a slit portion for flowing the coating liquid composed of at least two bars and a pocket portion for supplying the coating liquid uniformly in the width direction of the slit portion A liquid reservoir portion, a slide portion through which the coating liquid flowing out from the slit portion flows, and a lip portion that forms a bead between the support and the lip portion at the end of the slide portion.

  Since many coating films applied by a die coater are required to have an accuracy of the coating film thickness, the straightness of the die coater is also required to be an accuracy of several micrometers. For example, when coating is performed using a coating solution of a photographic photosensitive material containing silver halide grains and a heat development recording material using a slide type die coater, an extrusion type die coater, or a curtain type die coater, the member constituting the die coater The internal stress and the processing stress when manufacturing the die coater become obvious after a long period of time in the die coater, distortion occurs and deteriorates the straightness of the die coater. The distance between the die coater and the object to be coated is not uniform, so that the film thickness uniformity of the width of the coating is deteriorated. In some cases, there is a possibility that the coating cannot be performed. For this reason, in order to improve the film thickness uniformity in the coating direction of the die coater after a long period of time, studies have been made from the viewpoint of the die coater processing method.

  For example, roughing is performed by cutting from the bar constituting the die coater, the work-affected layer in which the residual stress is generated by roughing is removed by grinding, and the residual stress is removed by performing warping. There is known a die coater whose slit surface accuracy is stable over time and a processing method thereof (see, for example, Patent Document 1).

  However, although the technique described in Patent Document 1 is an excellent technique, it has the following drawbacks. 1) Although it is a method of removing residual stress due to roughing by grinding, the amount of grinding is enormous, and it is not efficient because of the number of grinding steps and costs. 2) A new residual stress is generated by this enormous grinding, and after a long period of time, distortion due to the stress becomes obvious, the die coater is deformed, and the straightness is deteriorated. 3) In the case of a wide die coater having a coating width exceeding 1 m, the items 1) and 2) are further deteriorated.

From such a situation, in the case of a die coater having a wide coating width, it is not possible to obtain a uniform film thickness uniformity of the coating width, so that only a quality coating that does not require a uniform coating film thickness can be performed. For this reason, a coating apparatus using a wide die coater having a coating width of 1 m or more, which has a uniform coating film thickness in the coating width direction even after a long period of time and can be obtained with few coating failures, and a method of manufacturing the die coater Development is desired.
Japanese Patent Application Laid-Open No. 11-192452

  The present invention has been made in view of such circumstances, and the purpose thereof is a coating width that provides a coated product that has a uniform coating thickness in the coating width direction even after a long period of coating and has few coating failures. Is to provide a coating apparatus using a wide die coater of 1 m or more and a method for producing the die coater.

  The above object has been achieved by the following constitution.

(Claim 1)
A pocket portion that spreads the coating liquid in the coating width direction; a coating liquid supply port that supplies the coating liquid to the pocket portion; and a slit portion that discharges the coating liquid from the pocket portion to an object to be coated. In a coating apparatus using a die coater assembled with two bars,
The bar is hung with one end face up, suspended, heat treated in a heat treatment furnace, and then ground.

(Claim 2)
The coating apparatus according to claim 1, wherein the grinding process includes a finish grinding process for forming a final finished shape.

(Claim 3)
3. The coating apparatus according to claim 2, wherein, in the finish grinding, when a bar is assembled to form a die coater, straightness in a coating width direction of at least a portion constituting the slit portion of the die coater is set to 10 μm or less. .

(Claim 4)
The coating apparatus according to any one of claims 1 to 3, wherein the heat treatment is performed at a temperature lower than a melting point of a bar material.

(Claim 5)
In the bar, the gap between at least one slit portion constituted by at least two bars is narrower on the outlet side than the inlet side of the coating liquid, and the gap d on the outlet side is d ≦ 5 × 10 ⁻⁵ [m]. The die coater is configured to spray a coating liquid from the slit portion in a film shape with a predetermined gap to a support that is installed or conveyed in non-contact with the exit of the slit portion, and to apply the coating liquid by colliding It is a member, The coating device of any one of Claims 1-4 characterized by the above-mentioned.

(Claim 6)
The bar causes the coating liquid to flow out from at least one slit portion formed by at least two of the bars to the support, and the coating liquid flows between the support and the vicinity of the coating liquid outflow portion of the slit portion. The coating apparatus according to any one of claims 1 to 4, wherein the coating apparatus is a constituent member of an extrusion die coater for forming and coating a bead.

(Claim 7)
The bar causes the coating liquid to flow out from the at least one slit portion formed by the at least two bars to the support, and the flowing coating liquid flows down the slope that continues to the slit portion outlet, and then the support. The coating apparatus according to any one of claims 1 to 4, wherein the coating apparatus is a constituent member of a slide type die coater that forms and applies a bead of a coating liquid between a body and the vicinity of the tip of the inclined surface. .

(Claim 8)
The bar is a constituent member of a curtain type die coater for applying the coating liquid flowing out from at least one slit portion formed by at least two bars to the support body by free-falling. The coating apparatus of any one of 1-4.

(Claim 9)
The said bar | burr is a structural member of the die-coater whose application | coating width | variety is 1 m or more, The coating device in any one of Claims 1-8 characterized by the above-mentioned.

(Claim 10)
The coating apparatus according to claim 9, wherein the coating width is a constituent member of a die coater having a coating width of 1 to 4 m.

(Claim 11)
The coating device according to any one of claims 5 to 9, wherein the support is a belt-like support in which a reverse surface is held by a back roll.

(Claim 12)
The coating apparatus according to claim 6, wherein the support is held before and after the die coater by a support roll.

(Claim 13)
The coating apparatus according to claim 1, wherein the coating liquid is a photosensitive layer coating liquid containing a silver component for a photothermographic material.

(Claim 14)
A pocket portion that spreads the coating liquid in the coating width direction; a coating liquid supply port that supplies the coating liquid to the pocket portion; and a slit portion that discharges the coating liquid from the pocket portion to the object to be coated. In the manufacturing method of the die coater assembled with the bar of
A method of producing a die coater, wherein the bar is suspended with one end face up, heat-treated in a heat treatment furnace, ground, and then assembled into a die coater.

(Claim 15)
The method of manufacturing a die coater according to claim 14, wherein the grinding process includes a finish grinding process for forming a final finished shape.

(Claim 16)
16. The die coater according to claim 15, wherein, in the finish grinding, when a bar is assembled to form a die coater, the straightness in the coating width direction of at least a portion constituting the slit portion of the die coater is set to 10 μm or less. Manufacturing method.

(Claim 17)
The method for manufacturing a die coater according to any one of claims 14 to 16, wherein the heat treatment is performed at a temperature lower than a melting point of a bar material.

(Claim 18)
In the bar, the gap between at least one slit portion constituted by at least two bars is narrower on the outlet side than the inlet side of the coating liquid, and the gap d on the outlet side is d ≦ 5 × 10 ⁻⁵ [m]. The die coater is configured to spray a coating liquid from the slit portion in a film shape with a predetermined gap to a support that is installed or conveyed in non-contact with the exit of the slit portion, and to apply the coating liquid by colliding It is a member, The manufacturing method of the die-coater of any one of Claims 14-17 characterized by the above-mentioned.

(Claim 19)
The bar causes the coating liquid to flow out from at least one slit portion formed by at least two of the bars to the support, and the coating liquid flows between the support and the vicinity of the coating liquid outflow portion of the slit portion. The die coater manufacturing method according to any one of claims 14 to 17, wherein the die coater is a constituent member of an extrusion type die coater for forming and applying a bead.

(Claim 20)
The bar causes the coating liquid to flow out from the at least one slit portion formed by the at least two bars to the support, and the flowing coating liquid flows down the slope that continues to the slit portion outlet, and then the support. The die coater according to any one of claims 14 to 17, wherein the die coater is a constituent member of a slide type die coater that forms and applies a bead of a coating solution between a body and the vicinity of the tip of the inclined surface. Manufacturing method.

(Claim 21)
The bar is a constituent member of a curtain type die coater for applying the coating liquid flowing out from at least one slit portion formed by at least two bars to the support body by free-falling. The manufacturing method of the die-coater of any one of 14-17.

(Claim 22)
21. The method for producing a die coater according to claim 14, wherein the bar is a component of a die coater having a coating width of 1 m or more.

(Claim 23)
The method for producing a die coater according to claim 22, wherein the coating width is a constituent member of a die coater having a coating width of 1 to 4 m.

  As a result of diligent investigations to achieve the above-mentioned problems, the inventors gradually applied a uniform coating film thickness distribution in the coating width direction when applying a die coater having a coating width of 1 m or more for a long time. As a cause, the internal stress of the bar constituting the die coater and the processing stress when producing the bar become obvious, distortion occurs and the straightness of the die coater is deteriorated, and further, along with the deterioration of straightness, It was found that the slit gap in the coating width direction and the distance between the die coater and the object to be coated become non-uniform, and the film thickness uniformity in the coating width direction deteriorates.

  The reason why the film thickness uniformity in the coating width direction deteriorates over a long period of time is as a result of further investigations by the inventors, and as a result, when manufacturing a die coater, the following phenomenon occurs in the heat treatment of the bar constituting the die coater: Was estimated to have occurred. 1) Since a bar is placed horizontally on a table and placed in a heat treatment furnace, and the heat treatment is performed, the straightness of the table is affected, and the bending of the table is transferred to the bar, making it difficult to obtain straightness. 2) When the bar expands and contracts during heating and shrinks together with the table, the amount of expansion and contraction can be different between the bottom surface of the bar that contacts the table and the other surface that does not contact, causing warping and twisting. However, it is difficult to obtain straightness. 3) When the base and the lower surface of the bar are not in full contact with each other or when installed on a sleeper, the non-contact portion is bent downward due to gravity, and straightness is hardly obtained. By performing grinding for correcting the straightness of the bar, which has been deteriorated by heat treatment in this way, the processing stress of grinding remains on the bar. It was presumed that the processing stress remaining in the bar became apparent as the die coater assembled with these bars elapsed for a long period of time, the entire die coater was distorted, and the film thickness uniformity of the coating width deteriorated.

  In contrast, as a result of diligent investigations by the inventors, the heat treatment performed when manufacturing the bar constituting the die coater is not affected by disturbance, and the straightness distortion of the bar generated by the heat treatment is minimized. It has been found that it is effective to reduce the processing stress due to finish grinding and to reduce the residual processing stress of the bar, and as soon as the present invention has been achieved.

  A coating apparatus and a die coater using a wide die coater with a coating width of 1 m or more, which has a uniform coating film thickness in the coating width direction even after a long period of time and can be applied with few coating failures. The method can be provided, and the production efficiency can be improved.

  Although an embodiment of the present invention will be described with reference to FIGS. 1 to 6, the present invention is not limited to this.

  FIG. 1 is a schematic view of a slide coating method in which a bead is formed and coated using a slide die coater. (A) of FIG. 1 is a schematic diagram of a slide coating method in which a bead is formed and coated on a holding portion of a support having a coating opposite surface held by a back roll, using a slide type die coater. FIG. 1B is an enlarged schematic view of the slide type die coater shown in FIG.

  In the figure, 1 is a slide type die coater, 2 is a back roll, and 3 is a belt-like support that is continuously conveyed from upstream to downstream (in the direction of the arrow in the figure). Reference numerals 101a to 101d denote bars constituting the coater. The number of bars is not fixed, but can be increased or decreased depending on the number of layers to be applied. The back roll is a transport roll installed on the opposite side of the belt-like support 3 with the slide-type die coater 1 and the belt-like support 3 in between. Due to its large influence, it is made of a metal with a large diameter of 200 mm or more.

  Reference numerals 102a to 102c denote slit portions which are outlets of the coating liquid formed between the bars constituting the slide type die coater. The number of slits varies depending on the number of bars constituting the slide die coater, but is usually 2-20. The slide type die coater shown in the figure is composed of four bars, and shows a slide type die coater for simultaneous multi-layers having three slit portions.

  Reference numerals 103a to 103c denote inner walls of the slit portions 102a to 102c, and 104a to 104c denote edge portions of the outlets of the slit portions 102a to 102c. Reference numerals 105a to 105c denote pocket portions provided in the slit portions 102a to 102c for uniformly extruding the coating liquid sent from the supply pipes 403a to 403c in the width direction from the slit portions 102a to 102c. Reference numerals 106a to 106c denote inner walls of the pocket portions 105a to 105c.

  Reference numerals 107a to 107d denote slide surfaces. The coating liquid prepared in the preparation pots 401a to 401c of the coating liquid supply system 4 is supplied to the liquid reservoirs 105a to 105d formed between the bars 101a to 101d through the supply pipes 403a to 403c by the liquid feed pumps 402a to 402c. The coating liquid supplied to 105c and pushed out from the slit portions 102a to 102c flows down the slide surfaces 107a to 107c, forms the bead 5 through the lip portion 108, and is held by the back roll 2 on the surface opposite to the coating. It is applied to the holding part of the support 3 to be conveyed.

  Reference numeral 110 denotes an outer wall connected to the lip portion 108. Reference numerals 109a to 109c denote coating liquid supply flow path portions for supplying the coating liquid sent from the supply pipes 403a to 403c to the pocket portions 105a to 105c.

  111a to 111d indicate the back surfaces of the bars 101a to 101d facing the slide surfaces 107a to 107d, and the back surfaces 111a to 111d form the back surface of the slide die coater 1.

  Reference numeral 6 denotes a decompression chamber provided in the lower part of the slide type die coater 1 for stabilization of application, and 601 denotes a suction pipe. Reference numeral 7 denotes a coating layer coated on the support. W1 indicates an application point at which the coating liquid is applied to the support 3 by the slide die coater 1, and a position of 0 to 20 degrees below the horizontal axis that normally passes through the center of the back roll is preferable.

  FIG. 2 is a schematic view of an extrusion coating method in which an extrusion type die coater is used to form and apply beads. (A) of FIG. 2 is a schematic diagram of an extrusion coating method in which a bead is formed and coated on a holding portion of a support body whose opposite surface is held by a back roll using an extrusion die coater. FIG. 2B is an enlarged schematic view of the extrusion type die coater shown in FIG.

  In the figure, 8 denotes an extrusion type die coater, and 801a to 801c denote bars constituting the extrusion type die coater 8. The number of bars is not fixed, but can be increased or decreased depending on the number of layers to be applied.

  Reference numerals 802a and 802b denote slit portions which are outlets of the coating liquid formed between the bars 801a to 801c constituting the extrusion type die coater 8. The number of slit portions varies depending on the number of bars constituting the extrusion type die coater, but is usually 1 to 5. The extrusion type die coater shown in this figure is composed of three bars, and shows an extrusion type die coater for simultaneous multilayers having two slit portions.

  Reference numerals 803a and 803b denote inner walls of the slit portions 802a and 802b, reference numerals 804a and 804b denote exit edge portions of the slit portions 802a and 802b, and reference numerals 805a to 805c denote lip portions. Reference numerals 806a and 806b denote pocket portions provided in the slit portions 802a and 802b in order to uniformly push the coating liquid sent from the supply pipes 403a and 403b in the width direction from the slit portions 802a and 802b. Reference numerals 807a and 807b denote inner walls of the pocket portions 806a and 806b.

  Reference numerals 808a and 808b denote coating liquid supply flow path sections for supplying the coating liquid sent from the supply pipes 403a and 403b to the pocket sections 806a and 806b. Reference numeral 809 denotes an outer wall connected to the lip portion 805a.

  Reference numerals 810a to 810c denote the back surfaces of the bars 801a to 801c facing the lip portions 805a to 805c. The back surfaces 810a to 810c form the back surface of the extrusion die coater 8.

  Each of the pocket portions 806a formed between the bars 801a to 801c through the supply pipes 403a and 403b by the liquid feed pumps 402a and 402b with the coating liquid prepared in the respective preparation pots 401a and 401b of the coating liquid supply system 4. , 806b, and the coating liquid pushed out from the slit portions 802a and 802b forms a bead 9 through the lip portion 805a, and holds the belt-like support 3 that is transported while being held on the opposite surface by the back roll 2. It is applied to the part. W2 indicates a coating point at which the coating liquid is applied to the support 3 by the coater 8, and a position of 0 to 90 degrees below the horizontal axis that normally passes through the center of the back roll is preferable. Other reference numerals are the same as those in FIG.

  FIG. 3 is a schematic view of an extrusion coating method in which the extrusion type die coater shown in FIG. 2 is applied to a support supported by a support roll.

  In the figure, 10 indicates a support roll. This figure shows a method of applying with two support rolls arranged upstream and downstream of the extrusion type die coater 8 instead of supporting the support with a back roll as shown in FIG. Yes. Other symbols are the same as those in FIG.

  FIG. 4 is a schematic view of an extrusion coating method in which another type of extrusion type die coater is used, and a coating liquid is collided with a predetermined gap from a slit portion without forming a bead. (A) of FIG. 4 is a schematic diagram of an extrusion coating method in which coating is performed without forming a bead using another type of extrusion type die coater on a holding portion of a support body on which a coating opposite surface is held by a back roll. It is. FIG. 4B is an enlarged schematic view of the extrusion type die coater shown in FIG.

  In the figure, 11 is an extrusion type die coater, and 1101a to 1101c are bars constituting the coater. The number of bars is not fixed, but can be increased or decreased depending on the number of layers to be applied.

  Reference numerals 1102a and 1102b denote slit portions formed between the respective bars 1101a to 1101c, which are respectively provided between the respective bars constituting the extrusion type coater. Reference numerals 12a and 12b denote coating films formed by spraying a coating liquid from the slit portions 1102a and 1102b.

  The number of slit portions varies depending on the number of bars constituting the extrusion type die coater, but is usually 1 to 5. The extrusion type die coater shown in this figure is composed of three bars, and shows an extrusion type die coater for simultaneous multilayers having two slit portions.

  Reference numerals 1103a and 1103b denote coating solution outlet sides of the respective slit portions 1102a and 1102b, and 1103a1 and 1103b1 denote coating solution inlet sides. Reference numerals 1104a and 1104b denote inner walls of the outlet sides 1103a and 1103b of the respective coating liquids of the respective slit portions 1102a and 1102b, and 1104a1 and 1104b1 denote inner walls of the inlet sides 1103a1 and 1103b1 of the respective coating liquids. Reference numerals 1105a and 1105b denote edge portions of the slit portions 1102a and 1102b, and reference numerals 1106a and 1106b denote lip portions. Reference numerals 1107a and 1107b denote liquid reservoirs provided in the slit portions in order to push the coating liquid sent from the supply pipes 403a and 403b uniformly in the width direction from the slit portions 1102a and 1102b. Reference numerals 1108a and 1108b denote inner walls of the liquid reservoirs 1107a and 1107b.

  Reference numerals 1109a and 1109b denote coating liquid supply flow path sections for supplying the coating liquid sent from the supply pipes 403a and 403b to the liquid reservoirs 1107a and 1107b. Reference numeral 120 denotes an outer wall connected to the lip portion 1106a.

  Each liquid reservoir 1107a created between the respective bars 1101a to 1101c is passed through the respective supply pipes 403a and 403b by the respective liquid feed pumps 402a and 402b with the coating liquid prepared in the respective preparation tanks 401a and 401b of the coating liquid supply system 4. The coating liquid supplied to 1107b and ejected in the form of a film from each of the slit portions 1102a and 1102b collides with the holding portion of the belt-like support 3 that is held and conveyed by the back roll 2 and applied.

D indicates the exit gap of the slit portion. The exit gap D can be appropriately adjusted depending on the physical properties of the coating liquid used and the coating thickness. The slit portion has a wide gap on the inlet side of the coating solution and a narrow outlet side, and the outlet gap D of the slit portion satisfies D ≦ 5 × 10 ⁻⁵ [m]. More preferably, D is 1 × 10 ⁻⁵ [m] ≦ D ≦ 4 × 10 ⁻⁵ [m]. By setting it in such a range, a coating solution can be ejected in a very thin film form from a conventional extrusion type die coater, and a thin film can be applied.

  FIG. 5 is a schematic view of a curtain coating method using the slide type die coater shown in FIG.

  In the figure, reference numeral 13 denotes a film formed by natural falling after flowing down the slide surface in a state in which the coating liquid pushed out from the slit portion openings is laminated. This film 13 is applied to a belt-like support. Other reference numerals are the same as those in FIG.

  In various types of die coaters shown in FIGS. 1 to 5, the pocket portion generally has a large cross-section and a flow velocity in order to spread the coating solution in the coating width direction at a uniform pressure and allow the uniform coating solution to flow out from the slit portion. Designed to be low. For this reason, making the straightness of the pocket portion and the slit portion constant is effective in stabilizing the coating film thickness in the coating width direction.

  The lip portion is a slide type die coater and an extrusion type die coater shown in FIGS. 1 to 3 in which the coating liquid flowing out from the slit forms a bead between the support and the die coater to apply the coating liquid to the support. In this case, if the straightness of the lip part is poor, the bead becomes unstable and the coating film thickness in the coating width direction becomes unstable, so making the straightness of the lip part constant stabilizes the coating film thickness in the coating width direction. It is effective in doing.

  Since the edge has a function of stably flowing the coating liquid from the slit, when the straightness of the edge is poor, the coating liquid does not flow stably from the slit, and the coating film thickness in the coating width direction becomes unstable. In addition, making the straightness of the lip portion constant is effective in stabilizing the coating film thickness in the coating width direction.

  In the case of the slide type die coater shown in FIGS. 1 and 5, the slide surface is a surface through which the coating liquid flowing out from the slit flows down. Therefore, when the slide surface is not straight, the coating liquid slides with a uniform thickness. Since the surface does not flow down and the coating film thickness in the coating width direction becomes unstable, making the straightness of the slide surface constant is effective in stabilizing the coating film thickness in the coating width direction.

  The present invention includes a pocket portion that spreads the coating liquid in the coating width direction, a coating liquid supply port that supplies the coating liquid to the pocket portion, and a slit that discharges the coating liquid from the pocket portion to an object to be coated. The present invention relates to a coating apparatus using a die coater manufactured using a bar in which straightness of at least two bars constituting a die coater having a portion is constant, and a method for manufacturing the die coater. The method for manufacturing the die coater of the present invention will be described below.

  FIG. 6 is a schematic view showing a state in which a bar constituting the slide die coater shown in FIG. 1 is suspended in the direction of gravity and heat treatment is performed in a heat treatment furnace. FIG. 6A is a schematic view showing a state in which the bar constituting the slide type die coater shown in FIG. 1 is suspended with one end face of the bar facing upward, and heat treatment is performed in a heat treatment furnace. FIG. 6B is a schematic view showing a state in which the bar constituting the slide type die coater shown in FIG. 1 is hung with its one end face up and the fulcrum is changed, and heat treatment is performed in a heat treatment furnace. In this figure, the heat treatment furnace is omitted.

  In the figure, reference numeral 13a denotes a hanging jig attached to substantially the center of the end face 110b of the bar 101b (the part that forms the side surface of the die coater when the bar is assembled into a die coater). Reference numeral 14a denotes a member for suspending the bar 101b via the jig 13a. Reference numeral 13b denotes a hanging jig attached to the end of the end surface 110b of the bar 101b. Reference numeral 14b denotes a member for suspending the bar 101b via the jig 13b.

  The members 14a and 14b are not particularly limited as long as they can withstand the mass of the bar, and examples thereof include steel chains and wires. This figure has shown the case where a wire is used. Other reference numerals are the same as those in FIG.

  FIG. 7 is a schematic view showing a state in which the bar constituting the extrusion type die coater shown in FIG. 2 is suspended in the direction of gravity and heat treatment is performed in a heat treatment furnace. FIG. 7A is a schematic view showing a state in which the bar constituting the extrusion type die coater shown in FIG. 2 is suspended with one end face of the bar facing upward, and heat treatment is performed in a heat treatment furnace. FIG. 7B is a schematic view showing a state in which the bar constituting the extrusion type die coater shown in FIG. 2 is suspended with one end face of the bar being turned up and the fulcrum is changed, and heat treatment is performed in a heat treatment furnace. . In this figure, the heat treatment furnace is omitted.

  In the drawing, reference numeral 15a designates a hanging jig attached to substantially the center of the end surface 811b of the bar 801b (the portion forming the side surface of the die coater when the bar is assembled to form a die coater). Reference numeral 16a denotes a member for suspending the bar 801b via the jig 15a. Reference numeral 15b denotes a hanging jig attached to the end of the end surface 811b of the bar 801b. Reference numeral 16b denotes a member for suspending the bar 801b via the jig 15b.

  The members 16a and 16b are not particularly limited as long as they can withstand the mass of the bar, and examples thereof include steel chains and wires. This figure has shown the case where a wire is used. Other symbols are the same as those in FIG.

  As shown in FIG. 6 and FIG. 7, the part for attaching the hanging jig used when hanging the bar is a part that does not affect the flow of the coating liquid when the bar is assembled to form a die coater. It doesn't matter anywhere. In this figure, when a bar is assembled to form a die coater, a jig is attached to the end surface of the bar forming the side surface of the die coater and suspended.

  The attachment position of the jig for hanging is not particularly limited, but a state where the long side, that is, the coating width direction is the gravity direction is stable and preferable.

  When the bars constituting the die coater are heat-treated in a heat treatment furnace by the method shown in this figure, the surroundings of the bar are overheated and cooled without being in contact with other solids. Since the surface expands and contracts in the same way, there is no occurrence of warping or twisting, and conversely if there is a bending, the force works in the direction in which the bending is extended by gravity, so the bending that the bar originally has has been improved It is possible to obtain a bar with good straightness. As a result, since the amount of grinding can be reduced even in the grinding performed after the heat treatment, residual processing stress accompanying the grinding is reduced. The die coater manufactured by assembling the bars manufactured by such a method does not change the straightness which affects the coating property even after a long period of time, so that stable coating is possible. In particular, such an effect makes it possible to suppress the generation of distortion even for a wide die coater having a width of 1 m or more, which has conventionally been difficult to suppress the generation of distortion. The wide die coater of 1 m or more preferably indicates a die coater of 1 to 4 m.

  An example of a method for manufacturing the die coater of the present invention will be described below. The method of manufacturing the die coater of the present invention is a method performed through the following first to third steps.

  The first stage is a heat treatment step in which each bar constituting the die coater is suspended in the direction of gravity to perform heat treatment.

  The second stage is a grinding process for removing the distortion caused by the heat treatment in the first stage.

  The third stage is an assembly process in which each bar obtained in the second stage is assembled into a die coater.

Since the temperature of the first stage heat treatment varies depending on the material of the bar constituting the die coater, it is difficult to determine the numerical value, but the upper limit temperature is lower than the melting point of the material. There is no restriction | limiting in particular as a bar used by this invention, For example, precipitation hardening type stainless steel is mentioned.
The grinding process performed in the second stage has the following two processes. The first process is a first grinding process for removing distortion generated by the heat treatment. The second step is a second grinding step for finishing the shape and straightness drawn on the target design drawing after the first grinding step.

  The straightness of the bar after the second grinding is 10 μm or less. When the thickness exceeds 10 μm, it is difficult to supply a stable coating solution, and the coating film thickness becomes unstable.

  Straightness refers to the straightness of the bar surface in the coating width direction (per 1 m length), with the bar placed on a precision surface grinder and the dial gauge stylus in contact with the bar measurement point. It is a value measured by fixing and moving a precision surface grinder. Grinding can be performed using a generally used precision surface grinder. The manufacturing method of the die coater of the present invention is particularly effective for a die coater that applies a wide application width of 1 m or more, preferably 1 to 4 m. It is possible to obtain a die coater through these first to third stages.

  The support used in the present invention is not particularly limited as long as it can be transported in a belt shape, and for example, paper, plastic film, metal sheet and the like can be used. Examples of the paper include resin-coated paper and synthetic paper. Examples of the plastic film include polyolefin films (eg, polyethylene film, polypropylene film, etc.), polyester films (eg, polyethylene terephthalate film, polyethylene 2,6-naphthalate film, etc.), polyamide films (eg, polyetherketone film, etc.), Examples thereof include cellulose acetate (for example, cellulose triacetate). Moreover, an aluminum plate is a typical metal sheet. Moreover, there is no restriction | limiting in particular also about the thickness of the support body to be used.

  The coating solution that can be used in the present invention is not particularly limited. For example, a coating solution such as a photographic photosensitive material, a heat-developable recording material, an ablation recording material, a magnetic recording medium, a steel plate surface treatment, an electrophotographic photosensitive member (below) And a coating solution of a coating solution, a top coating solution, a back surface layer solution, and the like. Among these, a coating solution for a photosensitive layer containing a silver component and a coating solution for a non-photosensitive protective layer, which are coating solutions for a photothermographic material, are particularly preferable coating solutions.

  Examples The effects of the present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Example 1
In accordance with the method shown below, a photosensitive layer coating solution and a surface protective layer coating solution containing organic silver were prepared.

<Photosensitive layer coating solution>
<< Preparation of Halogenated Emulsion A >>
After dissolving 7.5 g of inert gelatin and 10 mg of potassium bromide in 900 ml of water and adjusting the temperature to 35 ° C. and pH to 3.0, bromide with a molar ratio of (98/2) to 370 ml of an aqueous solution containing 74 g of silver nitrate 370 ml of an aqueous solution containing 1 × 10 ⁻⁶ mole of potassium, potassium iodide and [Ir (NO) Cl ₅ ] salt per mole of silver and 1 × 10 ⁻⁶ mole of rhodium chloride per mole of silver was added to pAg 7.7. Added by the controlled double jet method. Thereafter, 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene was added, the pH was adjusted to 5 with NaOH, the average particle size was 0.06 μm, the monodispersity was 10%, the projected diameter Cubic silver iodobromide grains having an area variation coefficient of 8% and a [100] face ratio of 87% were obtained. This emulsion was coagulated and precipitated using a gelatin flocculant and desalted, and 0.1 g of phenoxyethanol was added to adjust the pH to 5.9 and pAg 7.5 to obtain a silver halide emulsion. Further, the obtained silver halide emulsion was chemically sensitized with chloroauric acid and inorganic sulfur to obtain silver halide emulsion A.

  The coefficient of variation of the monodispersity and the projected diameter area was calculated by the following equation.

Monodispersity (%) = (standard deviation of particle size) / (average value of particle size) × 100
Coefficient of variation of projected diameter area (%) = (standard deviation of projected diameter area) / (average value of projected diameter area) × 100
<< Preparation of Na behenate solution >>
In 945 ml of pure water, 32.4 g of behenic acid, 9.9 g of arachidic acid, and 5.6 g of stearic acid were dissolved at 90 ° C. Next, 98 ml of a 1.5 mol / L sodium hydroxide aqueous solution was added while stirring at high speed. Next, 0.93 ml of concentrated nitric acid was added, and then cooled to 55 ° C. and stirred for 30 minutes to obtain a sodium behenate solution.
(Preform emulsion preparation)
15.1 g of the above silver halide emulsion A was added to the above sodium behenate solution, adjusted to pH 8.1 with a sodium hydroxide solution, 147 ml of a 1 mol / L silver nitrate solution was added over 7 minutes, and the mixture was further stirred for 20 minutes. Water-soluble salts were removed by ultrafiltration. The resulting silver behenate was a grain having an average grain size of 0.8 μm and a monodispersity of 8%. After forming a floc of the dispersion, water was removed, water was further washed 6 times and water was removed, followed by drying. Next, 544 g of a methyl ethyl ketone solution (17% by mass) of polyvinyl butyral (average molecular weight 3000) and 107 g of toluene. Was gradually added and mixed, and then dispersed at 27.6 MPa with a media disperser to prepare a preform emulsion.

<Preparation of photosensitive layer coating solution>
Preform emulsion 240g
Sensitizing dye-1 (0.1% methanol solution) 1.7 ml
Pyridinium promide perbromide (6% methanol solution) 3 ml
Calcium bromide (0.1% methanol solution) 1.7ml
Antifoggant-1 (10% methanol solution) 1.2 ml
2- (4-Chlorobenzoylbenzoic acid (12% methanol solution))
9.2ml
11 ml of 2-mercaptobenzimidazole (1% methanol solution)
17 ml of tribromomethylsulfoquinoline (5% methanol solution)
Developer-1 (20% methanol solution) 29.5 ml

<Surface protective layer coating solution>
<< Preparation of surface protective layer coating liquid >>
Acetone 35 ml / m ²
Methyl ethyl ketone 17ml / m ²
Cellulose acetate 2.3 g / m ²
Methanol 7ml / m ²
Phthalazine 250mg / m ²
4-methylphthalic acid 180mg / m ²
Tetrachlorophthalic acid 150mg / m ²
Tetrachlorophthalic anhydride 170mg / m ²
Matting agent: 10% monodispersion average particle size 4 μm monodispersed silica
70 mg / m ²
_{C 9 H 19 -C 6 H 4} -SO 3 Na 10mg / m 2
<Production of die coater>
The slide type die coater shown in FIG. 1-1 and 1-2. Each bar made of stainless steel (SUS630) and having a length of 2000 mm on the long side is suspended in the state shown in FIG. 6 and heat-treated in a heat treatment furnace as shown in Table 1, and generated by heat treatment. After performing the first grinding process to remove the distortion, the second grinding process to make the final finished shape was performed to assemble and produce the slide type die coater. In addition, grinding was performed under the same conditions except that it was heat-treated in a heat treatment furnace in a state where it was placed on a table in place of the suspension method (the part to be the back side of the slide-type die coater faced down and standing on the table) Slide type die coater No. for assembling and comparing slide type die coaters. 1-3.

  The heat treatment was performed in a heat treatment furnace at a temperature of 400 ° C. for 5 hours. When the bar is assembled into a slide type die coater by the second grinding process, each straightness of the bar portion forming the pocket portion, the coating liquid supply port, the slit portion, the edge portion, the lip portion, and the slide surface is set to 1 μm, The surface roughness Ra was 0.1 μm and Rmax was 0.5 μm. The first and second grinding operations are performed using a column type precision surface grinder manufactured by Okamoto Machine Tool Co., Ltd. The straightness is set by placing a bar on the surface grinder and using the dial gauge stylus. The measurement was performed by fixing the bar in contact with the measurement site and moving the surface grinder. The surface roughness Ra and Rmax were measured with Surf Test SJ-201P manufactured by Mitutoyo Corporation.

<Application>
Adjust the viscosity of the prepared photosensitive layer coating solution to 0.5 Pa · s and the viscosity of the surface protective layer coating solution to 1.0 Pa · s, and support a strip-like support with a thickness of 175 μm, a width of 2100 mm, and a length of 1000 m. 10 slide bodies (using PET) were connected to each slide type die coater No. In a coating apparatus using 1-1 to 1-3, a belt-like support held by a back roll is coated with a coating width of 1900 mm, a coating speed of 30 m / min, and a photosensitive layer is attached to the lower layer in an amount of 75 g / m ^2. The upper layer was coated and dried so that the protective layer was 25 g / m ² to prepare Samples 101 to 103. In addition, each slide type die coater No. In a coating apparatus using 1-1 to 1-3, a belt-like support held by a back roll is coated with a coating width of 1900 mm, a coating speed of 30 m / min, and a photosensitive layer is attached to the lower layer in an amount of 75 g / m ^2. The upper layer was coated and dried so that the protective layer was 25 g / m ² . 104-106 were produced. Viscosity measurement was carried out by measuring the viscosity at each shear using HAROKE Rotovisco RV-12. In addition, the temperature at the time of application | coating of a photosensitive layer coating liquid and a surface protective layer coating liquid was performed at normal temperature.

<Evaluation>
Each obtained sample No. Table 2 shows the results obtained by measuring the width direction coating film thickness distributions 101 to 106. Evaluation of the width direction coating film thickness distribution was performed according to the following evaluation rank. The coating thickness distribution in the width direction is obtained by measuring the coating thickness at a position of 100 m from the end of coating at intervals of 50 mm in the coating width direction, and calculating the ratio of the difference between the maximum and minimum values to the average value. Expressed in The coating film thickness is measured using an electrical micrometer, Minicom M, manufactured by Tokyo Seimitsu Co., Ltd., one point of the sample is measured together with the support, and then the coated surface at the same location is wiped with a non-woven cloth moistened with methyl ethyl ketone. The difference between these measured values was taken as the coating film thickness.

Evaluation rank of width direction coating film thickness distribution ◎: width direction coating film thickness distribution is less than 0.1 to 1.0% ○: width direction coating film thickness distribution is less than 1.0 to 2.5% △: width direction coating Film thickness distribution is less than 2.5 to 5.0% x: Film thickness distribution in the width direction is 5.1% or more

  Slide type die coater No. in which the state of the bar during heat treatment is placed on the table. 1-3 is Sample No. As shown in FIG. 103, the coating film thickness distribution immediately after fabrication is good. As shown by 106, it was confirmed that the coating film thickness distribution was affected after one year of use. The effectiveness of the present invention was confirmed.

Example 2
<Photosensitive layer coating solution>
The photosensitive layer coating solution prepared in Example 1 was used.

<Surface protective layer coating solution>
The surface protective layer coating solution prepared in Example 1 was used.

<Production of die coater>
An extrusion type die coater shown in FIG. 2-1 and 2-2. Stainless steel (SUS630) made of stainless steel (SUS630) constituting the extrusion type die coater and each long bar 4000mm long are suspended in the state shown in Fig. 7 as shown in Table 3 and heat treated in a heat treatment furnace. After performing the first grinding process to remove the strain, the second grinding process to make the final finished shape was performed to assemble and produce an extrusion type die coater. In addition, grinding was performed under the same conditions except that it was heat-treated in a heat-treating furnace in a state where it was placed on a table instead of the suspension method (the part on the back of the extrusion die coater faced downward and stood on the table) Extrusion-type die coater No. 2-3. The heat treatment was performed in a heat treatment furnace at a temperature of 400 ° C. for 5 hours. When the bar is assembled by the second grinding process to form an extrusion die coater, the straightness of each part of the bar forming the pocket portion, coating solution supply port, slit portion, edge portion, and lip portion is set to 2 μm, and the surface is roughened. Ra was 0.1 μm, and Rmax was 0.5 μm. The first and second grinding operations are performed using a column type precision surface grinder manufactured by Okamoto Machine Tool Co., Ltd. The straightness is set by placing a bar on the surface grinder and using the dial gauge stylus. The measurement was performed by fixing the bar in contact with the measurement site and moving the surface grinder. The surface roughness Ra and Rmax were measured with Surf Test SJ-201P manufactured by Mitutoyo Corporation.

<Application>
Adjust the viscosity of the prepared photosensitive layer coating solution to 0.5 Pa · s and the viscosity of the surface protective layer coating solution to 1.0 Pa · s, and support a strip-shaped support with a thickness of 175 μm, a width of 4100 mm, and a length of 1000 m. 10 extrusion bodies (using PET) were connected to each extrusion type die coater No. In the coating apparatus used in 2-1 to 2-3, on the belt-like support held on the back roll, the coating width is 3900 mm, the coating speed is 30 m / min, the photosensitive layer is attached to the lower layer, and the amount is 75 g / m ² . The upper layer was coated and dried so that a protective layer was 25 g / m ² , and Sample No. 201-203 were produced. In addition, each extrusion type die coater No. In the coating apparatus used in 2-1 to 2-3, on the belt-like support held on the back roll, the coating width is 3900 mm, the coating speed is 30 m / min, the photosensitive layer is attached to the lower layer, and the amount is 75 g / m ² . The upper layer was coated and dried so that a protective layer was 25 g / m ² , and Sample No. 204-206 were produced. Viscosity measurement was carried out by measuring the viscosity at each shear using HAROKE Rotovisco RV-12. In addition, the temperature at the time of application | coating of a photosensitive layer coating liquid and a surface protective layer coating liquid was performed at normal temperature.

<Evaluation>
Each obtained sample No. Table 4 shows the results of measuring the coating film thickness distribution in the width direction attached to 201-206. Evaluation and measurement of the width direction coating film thickness distribution were performed by the same method as in Example 1, and were performed with the same evaluation rank as in Example 1.

  Extrusion type die coater No. in which the state of the bar during heat treatment is placed on a table. 2-3 is Sample No. As shown by No. 203, the coating film thickness distribution immediately after the production is good. As shown by 206, it was confirmed that the coating film thickness distribution was affected after one year of use. The effectiveness of the present invention was confirmed.

Example 3
<Photosensitive layer coating solution>
The photosensitive layer coating solution prepared in Example 1 was used.

<Surface protective layer coating solution>
The surface protective layer coating solution prepared in Example 1 was used.

<Production of die coater>
The slide type die coater No. 1 prepared in Example 1 was used. When producing 1-1, the straightness of all the surfaces of the bar by the second grinding process was changed as shown in Table 5 to assemble the slide die coater. 3-1 to 3-7.

<Application>
Each slide type die coater No. 1 immediately after the preparation of the prepared photosensitive layer coating solution was prepared. Samples Nos. 3-1 to 3-7 were applied and dried under the same conditions as in Example 1. 301-307 were produced. In addition, each slide type die coater No. Samples Nos. 3-1 to 3-7 were applied and dried under the same conditions as in Example 1. 308-314 were produced.

<Evaluation>
Each obtained sample No. Table 6 shows the results of measuring the thickness direction coating film thickness distributions 301 to 314. Evaluation and measurement of the width direction coating film thickness distribution were performed by the same method as in Example 1, and were performed with the same evaluation rank as in Example 1.

  The effectiveness of the present invention was confirmed.

Example 4
<Photosensitive layer coating solution>
The photosensitive layer coating solution prepared in Example 1 was used.

<Surface protective layer coating solution>
The surface protective layer coating solution prepared in Example 1 was used.

<Production of die coater>
Extrusion type die coater No. When producing 2-1, the straightness by the second grinding process was changed as shown in Table 7 and assembled to produce an extrusion type die coater. 4-1 to 4-7.

<Application>
Each of the extrusion type die coaters No. 1 immediately after the preparation of the prepared photosensitive layer coating solution was prepared. Samples 401 to 407 were prepared by coating and drying under the same conditions as in Example 1 using 4-1 to 4-7. In addition, each extrusion type die coater No. Samples 408 to 414 were prepared by applying and drying under the same conditions as in Example 1 using 4-1 to 4-7.

<Evaluation>
Table 8 shows the result of measuring the coating thickness distribution in the width direction attached to each of the obtained samples 401 to 414. Evaluation and measurement of the width direction coating film thickness distribution were performed by the same method as in Example 1, and were performed with the same evaluation rank as in Example 1.

  The effectiveness of the present invention was confirmed.

It is the schematic of the slide application | coating system which forms and apply | coats a bead using a slide type die coater. It is the schematic of the extrusion application | coating system which forms and apply | coats a bead using an extrusion type die coater. It is the schematic of the extrusion coating system apply | coated using the extrusion type | mold die-coater shown in FIG. 2 to the support body supported by the support roll. FIG. 5 is a schematic view of an extrusion coating method in which another type of extrusion type die coater is used and a coating liquid is collided and applied without forming a bead with a predetermined gap from a slit portion. It is the schematic of the curtain application | coating system using the slide type | mold die coater shown by FIG. It is the schematic which shows the state which suspends the bar | burr which comprises the slide type | mold die-coater shown in FIG. 1 toward the gravitational direction, and heat-processes with a heat processing furnace. It is the schematic which shows the state which hangs | hangs the bar which comprises the extrusion type die coater shown in FIG. 2 toward the direction of gravity, and heat-processes with a heat processing furnace.

Explanation of symbols

1 Slide type coater 101a to 101d, 801a to 801c, 111a to 111c, 1101a to 1101c Bar 102a to 102c, 802a, 802b, 1102a, 1102b Slit 105a to 105c, 806a, 806b, 1107a, 1107b Liquid reservoir 107a to 107d Slide surface 109a to 109c, 808a, 808b, 1109a, 1109b Coating liquid supply flow path part 108, 805a, 805b, 805c, 1106a, 1106b Lip part 110, 809, 120 Outer wall 2 Back roll 3 Band-shaped support body 8, 11 Extrusion type coater 10 Support roll

Claims (23)

A pocket portion that spreads the coating liquid in the coating width direction; a coating liquid supply port that supplies the coating liquid to the pocket portion; and a slit portion that discharges the coating liquid from the pocket portion to an object to be coated. In a coating apparatus using a die coater assembled with two bars,
The bar is hung with one end face up, suspended, heat treated in a heat treatment furnace, and then ground. The coating apparatus according to claim 1, wherein the grinding process includes a finish grinding process for forming a final finished shape. 3. The coating apparatus according to claim 2, wherein, in the finish grinding, when a bar is assembled to form a die coater, straightness in a coating width direction of at least a portion constituting the slit portion of the die coater is set to 10 μm or less. . The coating apparatus according to any one of claims 1 to 3, wherein the heat treatment is performed at a temperature lower than a melting point of a bar material. In the bar, the gap between at least one slit portion constituted by at least two bars is narrower on the outlet side than the inlet side of the coating liquid, and the gap d on the outlet side is d ≦ 5 × 10 ⁻⁵ [m]. The die coater is configured to spray a coating liquid from the slit portion in a film shape with a predetermined gap to a support that is installed or conveyed in non-contact with the exit of the slit portion, and to apply the coating liquid by colliding It is a member, The coating device of any one of Claims 1-4 characterized by the above-mentioned. The bar causes the coating liquid to flow out from at least one slit portion formed by at least two of the bars to the support, and the coating liquid flows between the support and the vicinity of the coating liquid outflow portion of the slit portion. The coating apparatus according to any one of claims 1 to 4, wherein the coating apparatus is a constituent member of an extrusion die coater for forming and coating a bead. The bar causes the coating liquid to flow out from the at least one slit portion formed by the at least two bars to the support, and the flowing coating liquid flows down the slope that continues to the slit portion outlet, and then the support. The coating apparatus according to any one of claims 1 to 4, wherein the coating apparatus is a constituent member of a slide type die coater that forms and applies a bead of a coating liquid between a body and the vicinity of the tip of the inclined surface. . The bar is a constituent member of a curtain type die coater for applying the coating liquid flowing out from at least one slit portion formed by at least two bars to the support body by free-falling. The coating apparatus of any one of 1-4. The said bar | burr is a structural member of the die-coater whose application | coating width | variety is 1 m or more, The coating device in any one of Claims 1-8 characterized by the above-mentioned. The coating apparatus according to claim 9, wherein the coating width is a constituent member of a die coater having a coating width of 1 to 4 m. The coating device according to any one of claims 5 to 9, wherein the support is a belt-like support in which a reverse surface is held by a back roll. The coating apparatus according to claim 6, wherein the support is held before and after the die coater by a support roll. The coating apparatus according to claim 1, wherein the coating liquid is a photosensitive layer coating liquid containing a silver component for a photothermographic material. A pocket portion that spreads the coating liquid in the coating width direction; a coating liquid supply port that supplies the coating liquid to the pocket portion; and a slit portion that discharges the coating liquid from the pocket portion to the object to be coated. In the manufacturing method of the die coater assembled with the bar of
A method of producing a die coater, wherein the bar is suspended with one end face up, heat-treated in a heat treatment furnace, ground, and then assembled into a die coater. The method of manufacturing a die coater according to claim 14, wherein the grinding process includes a finish grinding process for forming a final finished shape. 16. The die coater according to claim 15, wherein, in the finish grinding, when a bar is assembled to form a die coater, the straightness in the coating width direction of at least a portion constituting the slit portion of the die coater is set to 10 μm or less. Manufacturing method. The method of manufacturing a die coater according to any one of claims 14 to 16, wherein the heat treatment is performed at a temperature lower than a melting point of a bar material. In the bar, the gap between at least one slit portion constituted by at least two bars is narrower on the outlet side than the inlet side of the coating liquid, and the gap d on the outlet side is d ≦ 5 × 10 ⁻⁵ [m]. The die coater is configured to spray a coating liquid from the slit portion in a film shape with a predetermined gap to a support that is installed or conveyed in non-contact with the exit of the slit portion, and to apply the coating liquid by colliding It is a member, The manufacturing method of the die-coater of any one of Claims 14-17 characterized by the above-mentioned. The bar causes the coating liquid to flow out from at least one slit portion formed by at least two of the bars to the support, and the coating liquid flows between the support and the vicinity of the coating liquid outflow portion of the slit portion. The method for producing a die coater according to any one of claims 14 to 17, wherein the die coater is a constituent member of an extrusion type die coater for forming and applying a bead. The bar causes the coating liquid to flow out from the at least one slit portion formed by the at least two bars to the support, and the flowing coating liquid flows down the slope that continues to the exit of the slit portion, and then the support. The die coater according to any one of claims 14 to 17, wherein the die coater is a constituent member of a slide type die coater for forming and applying a bead of a coating solution between a body and the vicinity of the tip of the inclined surface. Manufacturing method. The bar is a constituent member of a curtain type die coater for applying the coating liquid flowing out from at least one slit formed by the at least two bars to the support body by freely dropping. The manufacturing method of the die-coater of any one of 14-17. The method for producing a die coater according to any one of claims 14 to 20, wherein the bar is a constituent member of a die coater having a coating width of 1 m or more. The method for producing a die coater according to claim 22, wherein the coating width is a constituent member of a die coater having a coating width of 1 to 4 m.

Images