JP5642632B2 - Manufacturing apparatus and manufacturing method of film with coating film - Google Patents

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a film with a coating film, and in particular, an advancing / retreating mechanism that applies a coating liquid to the surface of a continuously running belt-like support and moves back and forth between a coating position and a standby position. An apparatus for producing a film with a coating film, comprising: a coating head comprising: a coating roller comprising: a coating roller comprising: a back-up roller that supports the back side of the coating surface of the belt-like support; and a drying device comprising a casing provided immediately after the coating device. It relates to a manufacturing method.

  For various electronic display materials, image recording materials such as photographic films, and various recording materials, a coating liquid such as a photosensitive material is applied to a belt-like support (hereinafter referred to as a web) such as a plastic film by a coating apparatus. It is produced by drying the liquid with a drying device.

  The coating apparatus is installed in an air-conditioning room such as a clean room, and the coating liquid is applied to the web in a clean environment in which dust and the like are not scattered. The applied coating solution is dried by blowing dry air onto the web with a drying device. The coating device and the drying device ensure that the heat of the drying device is not transmitted to the coating device, and that the dry air, which is hot air, is not immediately applied to the coating surface of the web, or that a space for disposing the related devices is secured. In order to do this, a predetermined distance is provided, and a web travel line is formed between the coating device and the drying device.

  However, in the conventional apparatus for manufacturing a film with a coating film composed of a coating apparatus and a drying apparatus, the coating liquid applied to the web may flow due to the air-conditioned air, which may cause streaks or unevenness on the coating surface. In particular, when a low-viscosity coating liquid or a coating liquid colored with a dye or pigment is applied to a web running at high speed, the coating liquid is susceptible to the influence of air-conditioning air. If the air speed of the air-conditioning air is reduced, this problem can be solved. However, if the air-conditioning environment is changed, dust or the like may scatter and adhere to the coating layer, which may cause a coating defect.

  Therefore, in Patent Document 1, as a method and apparatus for providing a coating and drying method that can obtain a coating surface without streaks or unevenness without changing the air-conditioning environment, in Patent Document 1, a web traveling between the coating apparatus and the drying apparatus is provided. It has been proposed to provide a windshield panel disposed above to prevent the air-conditioned air from hitting the web from above and to restrict the airflow on the web to only the component in the web traveling direction.

JP 2003-102111 A

  However, the coating and drying method and apparatus of the cited document 1 are not sufficient for preventing streaks and unevenness (surface roughness). In particular, when applying a coating solution containing an organic solvent having a boiling point of 78 ° C. or lower, However, it has not been possible to solve the problem that uneven stripes, string stripes, and surface roughness tend to occur.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a manufacturing apparatus and a manufacturing method for a film with a coating film that can prevent wind-like streaks, string-like streaks, and surface roughness. And

In order to achieve the above object, the present invention provides a coating head having a forward / backward movement mechanism for applying / coating a coating liquid onto the surface of a continuously running belt-like support, and moving forward / backward between a coating position and a standby position. A back-up roller for supporting the back side of the coating surface of the support; and a coating device comprising: a drying device comprising a casing provided immediately after the coating device, wherein the casing is between the coating device and the drying device. the not covering the coated surface backside of the belt-like support, and, in the casing, the formed in the casing and integral with the air shield portion covering the end face of the strip support to the drying apparatus from the coating device A movable cover that covers at least the coating surface side of the belt-like support between the coating head and the end face of the belt-like support between the coating device and the drying device And wind shield plate fixed to the coating head cover, characterized in that is provided.

  In this invention, the movable cover which covers the application | coating surface of the strip | belt-shaped support body between a coating device and a drying device is provided. Thereby, string-like stripes can be prevented. The coating head and the casing are provided with a wind shielding portion and a wind shielding plate that cover the end face of the belt-like support between the coating device and the drying device. By covering the end portion in the coating apparatus, it is possible to prevent wind-like streaks and surface roughness when the coating liquid is applied to the belt-like support. The reason why the windshield plate that covers the end portion is also provided in the drying apparatus is to prevent wind-like streaks in the coating film up to the drying apparatus. It is also possible to cover the end surface of the belt-like support between the coating device and the drying device by providing a wind shielding plate only on the coating device, but cover the end surface of the belt-like support between the coating device and the drying device. If the windshield plate is supported by the coating device, the windshield plate has low rigidity, which causes vibration to the coating device and further causes wind uneven streaks.

  In this invention, it is preferable that the opposing surface with the said backup roller of the said wind-shielding part is a recessed shape.

  The concave shape may be a rectangle, but is most preferably an R shape, particularly an R shape that matches the curvature of the backup roller. Moreover, it is preferable that the distance of the part which a windshield board and a backup roller adjoin most be 0.5 mm or more and 10 mm or less. If it is too close to less than 0.5 mm, the backup roller may be damaged and the effect of the present invention will be diminished.

  In the present invention, the coating head is preferably a slot die.

  The present invention is a method of manufacturing a film with a coating film using the coating film manufacturing apparatus described above, and is surrounded by a wind shielding plate of the coating head, a wind shielding portion of the casing, and the movable cover. And a step of applying the coating liquid to the belt-like support with the coating apparatus in the order described.

  Further, the present invention is a method of manufacturing a film with a coating film using the coating film manufacturing apparatus described above, wherein the movable cover is opened in advance, and the coating head is moved from the standby position to the coating position. A step, a step of applying a coating liquid to the belt-like support, and a step of closing the movable cover are performed in the order described.

  Thus, by producing a film with a coating film, it is possible to prevent wind-like stripes, string-like stripes, and surface roughness of the film with a coating film.

  In the present invention, it is preferable that 10% by mass or more of the total solvent in the coating solution is an organic solvent having a boiling point of 78 ° C. or less.

  The present invention was devised in the face of unevenness that did not occur when a solvent having a boiling point higher than 78 ° C. (methyl ethyl ketone having a boiling point of 79.5 ° C. or toluene having a boiling point of 110.6 ° C.) was used. . Examples of the solvent having a boiling point of 78 ° C. or lower include methyl acetate (56.9 ° C.), ethyl acetate (77.1 ° C.), and acetone (56.5 ° C.).

  As described above, according to the present invention, it is possible to provide an apparatus and a method for manufacturing a film with a coating film capable of preventing wind-like stripes, string-like stripes, and surface roughness.

It is the schematic of the manufacturing apparatus of the film with a coating film of this invention. It is the perspective view which abbreviate | omitted the drying apparatus in the manufacturing apparatus of the film with a coating film of this invention.

  Hereinafter, preferred embodiments of a production apparatus and a production method for a film with a coating film according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing an example of a coating / drying line 10 to which the production apparatus and production method for a film with a coating film of the present invention is applied.

  The coating / drying line 10 includes a feeding device 12 that feeds a web (band-shaped support) 11 wound in a roll shape, a coating device that includes a backup roller 13 and a slot die 14 for coating the web 11 with a coating solution, A drying device 16 that dries a coating film (hereinafter also referred to as a coating layer) 15 formed on the web 11, and a web (may be used in the following description to include a coating layer formed). A large number of rolls 17, 18, 19 that form a traveling conveyance path and a winding device 21 that winds up a product 20 manufactured by coating and drying are provided. It is preferable that the wind speed is 0.1 m / s or less in a state where an anemometer is attached to the drying device 16 and the web 11 is not transporting the web 11. The drying device 16 includes casings 16a and 16b, and is dried at a desired temperature by a known heating device to dry the coating layer 15 on the web 11. Further, a hot air drying device (not shown) may be provided in the coating / drying line 10 in order to advance the drying of the web 11 delivered from the drying device 16.

  As the material of the web 11, resin films such as PE (polyethylene), PET (polyethylene terephthalate), and TAC (cellulose triacetate), paper, metal foil, and the like can be used. Examples of the coating solution include those containing discotic liquid crystals used in the production of optical compensation sheets and those containing silver halide grains used in photosensitive materials for heat development. It is not limited to. In the present invention, it is preferable to use a coating solution having a composition ratio of the organic solvent of 50% by mass or more.

  A coating device other than the extrusion die 14 system shown in FIG. 1 can also be used. For example, an extrusion die or a wire bar coater can be used. The application form may be such that the application surface is on the upper side with respect to the horizontal direction, or may be a structure on the lower side with respect to the horizontal direction. Moreover, the structure which inclines with respect to a horizontal direction may be sufficient. The coating apparatus has an advance / retreat mechanism for moving back and forth between the application position and the standby position.

  A dust removal facility (not shown) may be installed in front of the coating apparatus, or the surface of the web 11 may be pretreated. For optical films and the like that require high quality with almost no dust, a high-quality coated and dried film can be obtained by simultaneously adopting these.

  However, in such an apparatus for producing a film with a coating film, there has been a problem that wind-like streaks, string-like streaks, and surface roughness of the coating film appear. In particular, when applying a coating solution containing an organic solvent having a boiling point of 78 ° C. or less, wind-like stripes, string-like stripes, and surface roughness are likely to appear.

  Therefore, in the present invention, the casing (drying device 16) includes a wind shield integral with the casing covering the end surface side of the web 11 from the coating head (slot die 14) to the drying device 16 and the back side of the coating surface of the web 11. The portion 28, the movable cover 24 covering the coating surface side of the web 11 between the slot die 14 and the drying device 16, and the coating head (slot die 14) include the coating head (slot die 14) to the drying device. The wind shielding plate 26 fixed to the coating head covering the end face side of the web 11 up to 16 was provided. The movable cover 24 may also cover the end face side of the web 11 between the slot die 14 and the drying device 16.

  FIG. 2 is a perspective view in which the web coating surface side of the drying device is omitted in the production apparatus for a film with a coating film of the present invention.

  Since the movable cover 24 is provided so as to cover the application surface (application film 15) of the web 11, string-like streaks can be prevented. The movable cover 24 preferably has a distance of 3 to 15 mm from the application surface when the application liquid is applied. If it is narrower than 3 mm, scratches are likely to occur in the coating layer and the web, and if it exceeds 15 mm, the effect of preventing string-like streaks is poor. Further, the movable cover 24 may cover the end face side of the web 11 when a gap that cannot be covered by the wind shielding plate 26 and the wind shielding portion 28 is generated (see FIG. 1).

  And the wind-shielding board 26 and the wind-shielding part 28 which cover the end surface of the web 11 are each provided in the slot die 14 and the drying apparatus 16, and it can prevent a wind uneven stripe and surface roughness.

  Here, by providing the windshield plates 26 and 26 covering the end portions of the web 11 on the slot die 14, it is possible to prevent wind uneven stripes and surface roughness during application of the coating liquid. The reason why the wind shielding portion 28 that covers the end portion is also provided in the drying device 16 is to prevent wind-like streaks in the coating film up to the drying device 16.

  Although it is conceivable to provide a windshield plate only on the slot die 14 to cover the end surface of the web between the slot die 14 and the drying device 16, the end surface of the web between the slot die 14 and the drying device 16 is considered. If the windshield plate to be covered is supported by the slot die 14, the windshield plate has low rigidity, which may cause vibration to the slot die 14 and further cause a wind uneven stripe. Therefore, it is necessary to provide the windshield plate 26 and the wind shield portion 28 that cover the end surface of the web 11 on the slot die 14 and the drying device 16, respectively.

  Here, the gap (distance) between the wind shielding plate 26 and the wind shielding portion 28 is preferably 3 mm or less when the coating liquid is applied, and the gap (distance) between the movable cover 24 and the wind shielding plate 26 is It is preferable that the thickness is 2 mm or less when the coating liquid is applied. Moreover, it is preferable that the distance of the wind-shielding plate 26 or the wind-shielding part 28, and the web 11 end surface shall be 2 mm or more and 300 mm or less.

  The wind shield portion 28 may have a labyrinth structure as shown by the wind shield portion 28 in FIG. 2 to suppress air flow.

  Moreover, it is preferable that the opposing surface 28a with the backup roller 13 of the wind-shielding part 28 is dented. The concave shape may be a rectangle, but is most preferably an R shape, particularly an R shape that matches the curvature of the backup roller. Further, it is preferable that the distance between the wind shielding portion 28 and the portion where the backup roller 13 is closest is 0.5 mm or more and 10 mm or less. If it is too close to less than 0.5 mm, the backup roller may be damaged and the effect of the present invention will be diminished.

  Next, the manufacturing method of the film with a coating film which concerns on this invention is demonstrated.

  In the present invention, when manufacturing a film with a coating film using the coating film manufacturing apparatus of FIGS. 1 and 2, the wind shielding plate 26 of the coating head 14, the wind shielding portion 28 of the casing 16, and the movable cover 24. The step of causing the web 11 to enter the space surrounded by and the step of applying the coating solution to the web 11 with the slot die 14 are performed in the order described.

  In addition, when the present invention is manufactured using the coating film manufacturing apparatus of FIGS. 1 and 2, the movable cover 24 is opened in advance, and the slot die 14 is brought close to the coating position from the standby position; The step of applying the coating liquid to the web 11 with the slot die 14 and the step of closing the movable cover 24 are performed in the order described.

  As described above, by producing a film with a coating film, it is possible to suitably prevent wind uneven stripes, string-like stripes, and surface roughness of the film with a coating film.

  In the coating solution according to the present invention, 10% by mass or more of the total solvent in the coating solution is preferably an organic solvent having a boiling point of 78 ° C. or less. The present invention was devised in the face of unevenness that did not occur when a solvent having a boiling point higher than 78 ° C. (methyl ethyl ketone having a boiling point of 79.5 ° C. or toluene having a boiling point of 110.6 ° C.) was used. . Examples of the solvent having a boiling point of 78 ° C. or lower include methyl acetate (56.9 ° C.), ethyl acetate (77.1 ° C.), and acetone (56.5 ° C.).

[Example]
EXAMPLES Hereinafter, an Example is given and this invention is demonstrated in detail. However, it is not limited to these.

As the coating solution, 10% by mass of ethyl acetate in the total solvent in the coating solution was used. The coating solution had a coating solution viscosity of 5 (cp) and a surface tension of 29 (mN / m). Then, 20 (cc / m ² ) of the coating solution was applied to the web.

(Experiment 1)
Experiments were performed with the configuration shown in FIG. That is, the experiment was performed with a coating apparatus having the cover 24, the wind shielding plate 26, and the wind shielding portion 28. In this case, uneven stripes, string stripes, and surface roughness did not appear.

(Experiment 2)
In the configuration shown in FIG. 1, the experiment was performed without providing the wind shielding plate 26 of the coating head 14. In this case, no string-like streaks appeared, but uneven streaks and surface roughness occurred.

(Experiment 3)
The experiment was performed with the drying device 16 having no wind-shielding portion 28 in the configuration shown in FIG. In this case, no string-like streaks appeared, but uneven streaks and surface roughness occurred.

(Experiment 4)
The experiment was performed without providing the cover 24 in the configuration shown in FIG. In this case, string-like streaks appeared, and uneven streaks and surface roughness slightly occurred.

(Experiment 5)
An experiment was conducted using a conventional coating apparatus in which the cover 24, the wind shielding plate 26, and the wind shielding portion 28 were not provided. In this case, uneven stripes, string-like stripes, and surface roughness occurred.

  DESCRIPTION OF SYMBOLS 10 ... Application | coating / drying line, 11 ... Web (band-like support body), 13 ... Backup roller, 14 ... Application | coating head (slot die), 16 ... Drying apparatus (casing), 24 ... Cover, 26 ... Wind-shield board, 28 ... Wind-shielding part, 28a ... The surface of the wind-shielding part facing the backup roller

Claims (6)

A coating head that coats the surface of the belt-like support that travels continuously, has a forward / backward movement mechanism that moves forward and backward between the coating position and the standby position, and a backup roller that supports the back side of the coating surface of the belt-like support. An applicator comprising:
A drying device comprising a casing provided immediately after the coating device,
The casing, the coating apparatus wherein not covering the coated surface backside of the belt-shaped support until the drying apparatus from and to said casing, said casing and formed integrally with the end face of the strip support A windshield portion that covers, a movable cover that covers at least the coating surface side of the belt-like support between the coating device and the drying device;
In the coating head, a wind shielding plate fixed to the coating head covering the end face side of the belt-like support between the coating device and the drying device;
An apparatus for producing a film with a coating film, wherein:   The apparatus for producing a film with a coating film according to claim 1, wherein a surface of the wind shielding portion facing the backup roller is recessed.   The said coating head is a slot die, The manufacturing apparatus of the film with a coating film of Claim 1 or 2 characterized by the above-mentioned. A method for producing a film with a coating film using the production apparatus for a film with a coating film according to any one of claims 1 to 3,
A step of causing the belt-like support to enter a space surrounded by the wind-shielding plate of the coating head, the wind-shielding portion of the casing, and the movable cover; and applying the coating liquid to the belt-like support using the coating device. And a step of performing the steps in the order described. A method for producing a film with a coating film using the production apparatus for a film with a coating film according to any one of claims 1 to 3,
The step of opening the movable cover in advance and moving the coating head from the standby position to the coating position, the step of applying a coating liquid to the belt-like support, and the step of closing the movable cover are described. The manufacturing method of the film with a coating film characterized by performing in order of these.   The method for producing a film with a coating film according to claim 4 or 5, wherein 10% by mass or more of the total solvent in the coating solution is an organic solvent having a boiling point of 78 ° C or less.

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