JP2016180579A - Method and device for manufacturing resin film with coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for manufacturing a resin film with a coating film capable of preventing overheating of an unapplied portion to which coating fluid is not applied when the coating fluid applied to the resin film is dried in a resin film manufacturing process.SOLUTION: A method of manufacturing a resin film with a coating film includes: a process A of applying coating fluid to a resin film that is being conveyed and forming an applied portion to which the coating fluid is applied with given thickness and a transition region that is formed between the applied portion and an unapplied portion having no coating fluid applied thereto, the transition region applied with the coating fluid with thinner thickness than that applied to the applied portion; a process B of applying overheating inhibiting fluid to at least part of the transition region and the unapplied portion so that the fluid is applied to a boundary portion between the unapplied portion and the transition region; and a process C of drying and solidifying the coating fluid on the applied portion and the transition region by heating and of drying the overheating inhibiting fluid by heating the overheating inhibiting fluid, so as to form the coating film on the resin film.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and apparatus for producing a resin film with a coating film.

  As a device for drying the coating liquid applied to the resin film, a simple hot air nozzle is generally used. An infrared heater may be used in combination as a means for promoting the heating of the coating liquid. Patent Document 1 discloses a heating device in which hot air nozzles and hot air discharge mechanisms are alternately arranged in the direction of transporting the resin film, and an infrared heater is installed at the inlet of the hot air discharge mechanism as a heating device that efficiently dries the coating liquid. ing. This is because the temperature of the resin film and coating liquid is quickly raised by the radiant heat of the infrared heater, and hot air is blown from the hot air nozzle to the resin film, and the evaporation layer near the surface of the resin film is peeled off and exhausted to the outside by the hot air discharge mechanism. Thus, the coating liquid can be quickly dried by heating the resin film quickly and keeping the vapor concentration near the coating liquid low.

  The case where the heating apparatus disclosed in Patent Document 1 is applied to a resin film production apparatus will be described. FIG. 3 is a schematic diagram in which a heating device is applied to a production apparatus for a sequential biaxially stretched film, and includes an extruder 11, a base 12, a cooling drum 13, a longitudinal stretching machine 14, a coating liquid coating device 5, a heating device 6, and a horizontal device. It comprises a stretching machine 15 and a winding device 16. First, the polymer is extruded by the extruder 11, and the polymer is formed into a sheet through the die 12 and the cooling drum 13. Then, it extends | stretches in a conveyance direction with the longitudinal stretcher 14, and a coating liquid is apply | coated to the single side | surface or both surfaces of a resin film with the coating liquid coating device 5. FIG. After the coating liquid is dried by the heating device 6, the resin film is stretched in the width direction by the lateral stretching machine 15 and continuously wound by the winding device 16. The stretching method in the transverse stretching machine 15 is to grip both ends in the width direction of the resin film and stretch in the width direction.

  In this way, the resin film is stretched in a certain direction in the manufacturing process, thereby aligning molecules in the deformation direction and increasing the strength. However, both ends of the stretched resin film are not products because they have grip marks. Therefore, productivity is increased by cutting and collecting both ends of the resin film having a grip mark at the outlet of the transverse stretching machine 15 and melting and reusing it as a polymer. At this time, both ends of the resin film are not applied and the coating liquid is not applied in the coating liquid coating apparatus 5 so that the coating liquid which is an impurity is not mixed with both ends of the collected resin film.

JP 2010-101595 PR JP 2010-67579

  By the way, when drying a coating liquid with the heating apparatus 6, the uncoated part of the both ends of a resin film tends to become high temperature because heat is not consumed by the latent heat of evaporation of the coating liquid unlike the coated part. Therefore, when gripping the uncoated part at both ends of the resin film at the entrance of the subsequent horizontal stretching machine 15, the uncoated part is torn by the gripping impact, or only the high-temperature uncoated part is selectively stretched during stretching. As a result, the resin film is torn based on the uncoated portion, or the coated portion to be the product is not stretched by a necessary amount, and the strength of the resin film of the product is insufficient. In particular, the thicker the coating liquid in the coating portion, the greater the amount of heat that must be given before the drying is completed, so the uncoated portion is more overheated. Further, even when a large number of infrared heaters are arranged in order to increase the drying speed, the uncoated portion is more overheated.

  As a technique for preventing overheating of an uncoated portion in a field other than the production of a resin film, Patent Document 2 discloses a heat retaining material such as water or a solvent in an uncoated portion of a metal foil on which an electrode material is intermittently applied. Disclosed is a method for increasing the heat capacity of the uncoated part and preventing overheating of the uncoated part.

  However, even if the technique of Patent Document 2 is applied to the production of a resin film, in a resin film having a thermal conductivity lower than that of a metal foil, the supplied heat is difficult to diffuse. Local overheating is liable to occur at the places where they are not arranged. Therefore, when arrange | positioning a heat insulating material in the uncoated part of a resin film, it is necessary to arrange | position a heat insulating material uniformly so that the location where a heat insulating material may not be arrange | positioned does not arise. However, it is difficult to always place the heat insulating material at the desired position due to the influence of the meandering of the resin film and the variation of the application position, resulting in an unapplied part where the heat insulating material is not arranged, It will be arranged not only in the application part. When the heat insulating material is arranged in the application part, the temperature of the application part where the heat insulating material is arranged is prevented from being raised by the heat insulating material, and the temperature cannot be raised to a necessary temperature, and the resin film is torn during stretching. There's a problem.

  In the production of a resin film with a coating film, the present invention has a coating film that prevents the occurrence of the above problems and prevents overheating in an uncoated part when the applied coating liquid is dried with a heating device. A method and apparatus for producing a resin film are provided.

The method for producing a resin film with a coating film of the present invention that solves the above problems is a step of applying a coating liquid to one or both sides of a resin film being transported, wherein the coating part is applied to an arbitrary thickness And a transition region in which the coating liquid is applied with a thinner thickness than the application part between the application part and the non-application part where the application liquid is not applied, and the process A,
Step B for applying an overheating suppressing liquid to at least a part of the transition region and the uncoated portion so as to cover the boundary portion between the uncoated portion and the transition region;
Step C of heating the overlying suppression liquid by heating the overheating suppression liquid and drying the overheating suppression liquid while heating and drying the coating liquid in the application part and the transition region, and forming a coating film on the resin film; Have.

Moreover, the manufacturing apparatus of the resin film with a coating film of this invention which solves the said subject is as follows.
A coating liquid application device that applies a coating liquid to one or both sides of a resin film being transported, where the coating liquid is applied to an arbitrary thickness, and the coating section and the coating liquid are not applied. A transition region in which the coating liquid is applied with a thickness thinner than that of the application part,
An overheating suppressing device that applies an overheating suppressing liquid to at least a part of the transition region and the uncoated portion so as to cover a boundary portion between the uncoated portion and the transition region;
And a heating device for heating the coating liquid for the application part, the coating liquid for the transition region, and the overheating suppressing liquid.

  According to the manufacturing method and the manufacturing apparatus of the resin film with a coating film of the present invention, when the coating liquid applied to the resin film is dried, overheating of the uncoated portion can be prevented.

FIG. 1A is a schematic plan view of an embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view taken along line I-I in FIG. It is a schematic plan view of another embodiment of the present invention. It is the schematic which shows the manufacturing process of the resin film which is one Embodiment of this invention. It is a schematic sectional drawing which shows an example of a transition area | region. It is a schematic sectional drawing which shows an example of a transition area | region. FIG. 6A is a schematic plan view of an embodiment of the present invention provided with an accompanying air shielding means, and FIG. 6B is a schematic cross-sectional view taken along the line II of FIG. 6A.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

  Fig.1 (a) is a schematic plan view of the manufacturing apparatus of the resin film with a coating film which is one Embodiment of this invention, FIG.1 (b) is II schematic sectional drawing of Fig.1 (a).

  The structure of the manufacturing apparatus of the resin film with a coating film in this invention is demonstrated using FIG. The coating liquid application device 5 applies the coating liquid 2 to an arbitrary width in the width direction of the resin film 1 on one surface or both surfaces of the resin film 1. The coating liquid 2 is not applied to the entire surface of the resin film 1, but uncoated portions 9, which are areas where the coating liquid 2 is not applied, are formed on both sides of the applied coating liquid 2 in the width direction of the resin film 1. It is applied to remain. Furthermore, the coating liquid 2 is not applied so as to have a uniform thickness over the entire surface, but between the coating part 8 having a relatively thick coating liquid thickness and the coating part 8 and the uncoated part 9. It is applied so as to form a transition region 10 having a relatively thin coating liquid thickness. That is, by the coating liquid coating apparatus 5, an application part 8 where the coating liquid 2 is applied to the resin film 1 with an arbitrary thickness, and an uncoated part 9 where the coating liquid 2 is not applied on both sides of the application part 8, Between the application part 8 and the non-application part 9, the transition area | region 10 to which the coating liquid 2 was apply | coated thinner than the application part 8 is formed. In the production process of the sequential biaxially stretched film shown in FIG. 3, the resin film 1 is stretched in the width direction by a transverse stretching machine 15, and in some cases, both ends of the resin film 1 with a trace of grip at the outlet of the transverse stretching machine 15. The part is cut, collected, melted and reused as a polymer. In this case, both ends of the resin film 1 are not applied with the coating liquid 2 in the coating liquid coating apparatus 5 so that the coating liquid 2 as an impurity is not mixed with both ends of the collected resin film 1. .

  The coating liquid application apparatus 5 that applies the coating liquid 2 on one or both sides of the resin film 1 to form the coating part 8, the uncoated part 9, and the transition region 10 includes rod coating, gravure coating, reverse gravure coating, and slit die coating. And the like. As a method for forming the transition region 10 in these coating methods, for example, in rod coating, gravure coating, and reverse gravure coating, a groove processing of an arbitrary depth is performed on a normal groove portion corresponding to the coating portion 8. A method using a coating rod or a gravure roll in which a shallow groove is formed by applying a shallower groove than the normal groove at a position corresponding to the transition region 10 on both sides in the rod axis direction or the roll axis direction of the normal groove. In addition, in the rod coating, when the liquid pool formed on the upstream side of the coating rod in the transport direction of the resin film 1 is small, the thickness of the coating liquid 2 to be applied is reduced, so that the transition region 10 is formed. A method of reducing the amount of the liquid pool at this position by reducing the amount of the coating liquid 2 supplied to the corresponding liquid pool can be mentioned. Here, in the rod coating, as means for supplying the coating liquid 2 to the liquid reservoir, a method is provided in which a container having an opening in the upper part is provided at the lower part of the coating rod, and the coating liquid 2 in the container is picked up by rotation of the coating rod. And a method of supplying the coating liquid 2 to the resin film 1 or the liquid reservoir by a die, a fountain, or a pickup roll. Further, when a slit die is used as the coating liquid coating apparatus 5, there is a method in which the slit gap at the position corresponding to the transition region 10 is processed to be narrower than the slit gap at the position corresponding to the coating section 8. Among these, rod coating, gravure coating, and reverse gravure coating are preferably performed using a coating rod or gravure roll in terms of easy processing. The coating liquid thickness of the coating unit 8 is preferably 1 μm or more and 40 μm immediately after coating by the coating liquid coating apparatus 5.

  The overheating suppression liquid 3 is applied to the unapplied portion 9 and the transition region 10 by the overheating suppression device 4. By applying the overheating suppression liquid 3, the heat from the heating device 6 is consumed by the latent heat of evaporation during the temperature rise of the overheating suppression liquid 3 and the drying of the overheating suppression liquid 3. Overheating in the transition region 10 can be suppressed.

  The overheating suppression liquid 3 does not need to be applied to the entire transition region 10 as long as it is applied so as to cover the boundary portion between the unapplied portion 9 and the transition region 10. This is because when the overheating suppressing liquid 3 is applied to the border part between the applying part 8 and the transition region 10, the overheating suppressing liquid 3 is applied due to a slight meandering of the resin film 1 or a change in the position of the applying part 8. This is because it is applied to the portion 8. From this viewpoint, it is preferable that the overheating suppressing liquid 3 is not applied in the vicinity of the boundary portion between the application portion 8 and the transition region 10. On the other hand, with respect to the uncoated portion 9, it is preferable that the overheating suppressing liquid 3 is applied to the entire surface of the uncoated portion 9 from the viewpoint of preventing overheating of the uncoated portion 9 in the drying process. Here, the “drying step” refers to a step of drying the coating liquid 2 by the heating device 6 described later.

  The width of each transition region 10 is set so that the overheating suppressing liquid 3 is applied to the transition region 10 even when the resin film 1 meanders and the position of the application part 8 varies. In order to prevent the liquid 3 from being applied to the application part 8, a wider one is better. On the other hand, since the transition region 10 is a portion that does not become a product, it is preferable that the transition region 10 is as narrow as possible from this viewpoint. In general, the meandering width of the resin film 1 and the fluctuation range of the position of the coating portion 8 are larger when the traveling speed of the resin film 1 is faster and vary depending on other film forming conditions. At the following conveying speed, the meandering width is 20 mm or less, and the variation width of the position of the application unit 8 is 10 mm or less. Here, the “meandering width” refers to an amount of movement based on an end portion on one side of the resin film 1 in the width direction of the resin film 1. Further, the “variable width” refers to the amount of movement with reference to the end on one side of the application portion 8 in the width direction of the resin film 1. Considering these points, the width of each transition region 10 is preferably 10 mm or more and 70 mm or less.

  In the transition region 10, in consideration of a running section at the time of grooving of the coating rod, as shown in FIG. 4, the coating liquid thickness may gradually decrease from the application part 8 to the non-application part 9. Moreover, as shown in FIG. 5, the coating liquid thickness may become thin continuously. The “running section” refers to a desired groove depth that is formed before processing at a desired groove depth is started when processing a desired groove depth at an arbitrary portion of the coating rod. This is the shallow groove section.

  The coating liquid thickness in the transition region 10 is preferably thinner than the coating liquid thickness in the application part 8. Also, the application amount and type of the overheating inhibiting liquid 3 are determined so that the overheating inhibiting liquid 3 and the coating liquid 2 in the transition region 10 are dried before the drying of the coating liquid 2 in the application unit 8 is completed in the drying step. It is preferable to select appropriately. The reason for this will be described next. In the drying process, the conditions such as the temperature and the amount of hot air are determined so that the coating liquid 2 in the coating unit 8 can be dried. Therefore, the drying of the overheating suppressing liquid 3 and the coating liquid 2 in the transition region 10 is performed in the coating unit 8. If it is slower than the drying of the coating liquid 2, the drying may not be completed in the transition region 10 and the uncoated portion 9. In this case, since the temperature rise of the resin film 1 in the transition region 10 and the uncoated portion 9 is insufficient, problems such as tearing of the resin film 1 may occur at the time of stretching by the transverse stretching machine 15. Before the drying of the coating liquid 2 in the application part 8 is completed, the transition region 10 and the uncoated part 9 are changed to the application part 8 by drying the overheating inhibiting liquid 3 and the coating liquid 2 in the transition area 10. In comparison, it is possible to suppress a temperature rise failure and to prevent the resin film 1 from being broken during stretching. In addition, in the transition area | region 10, after the coating liquid 2 dries in the location where the overheating suppression liquid 3 is not apply | coated, the temperature of the resin film 1 rises. Therefore, in order to suppress overheating at a location where the overheating suppressing liquid 3 in the transition region 10 is not applied, it is better that the coating liquid thickness in the transition region 10 is not too thin. Further, when the overheating inhibiting liquid 3 and the coating liquid 2 in the transition region 10 are dried before the drying of the coating liquid 2 in the application unit 8 is completed, the transition is performed when the coating liquid thickness in the transition region 10 is increased. The application thickness of the overheating suppressing liquid 3 in the region 10 needs to be reduced. Usually, in the unapplied part 9 and the transition region 10, the amount of the overheating suppressing liquid 3 to be applied is set to be approximately the same. The coating thickness is also reduced, and the effect of suppressing overheating in the uncoated portion 9 is reduced. Therefore, the thickness of the coating liquid in the transition region 10 should not be too thick. Considering these points, the coating liquid thickness of the transition region 10 is preferably 30% or more and 70% or less, more preferably 40% or more and 60% or less of the coating liquid thickness of the application part 8. In the case where a coating rod is used as the coating liquid coating apparatus 5, the transition area 10 includes a running section as shown in FIG. 4, and the coating liquid in the transition area 10 does not have a desired coating liquid thickness in the running section. The preferable range of the thickness is indicated by the thickness of the coating liquid at a location excluding the run-up section of the transition region 10. When the transition region 10 is continuously thin as shown in FIG. 5, the preferable range of the coating liquid thickness in the transition region 10 is indicated by the average coating liquid thickness in the width direction of the transition region 10.

  Since the overheating inhibiting liquid 3 may collect the uncoated part 9 after the overheating inhibiting liquid 3 is applied and dried and reuse it as a polymer, a solid content that becomes a foreign substance remains in the uncoated part 9. It is preferable that it is comprised with the substance which evaporates by heating so that it may not. On the other hand, when it is not necessary to reuse the uncoated portion 9 as a polymer, the overheating suppressing liquid 3 may contain a solid content. Examples of the overheating inhibiting liquid 3 include water and organic solvents, and water that has a large latent heat of vaporization and is easy to handle is preferable. Here, the water includes pure water, ground water, industrial water, and the like. When the uncoated portion 9 is recovered and reused as a polymer, no foreign matter remains on the resin film 1 after the overheating suppressing liquid 3 evaporates. It is preferable to use pure water.

  As shown in FIG. 1, the overheating suppressing liquid 3 may be applied before the heating device 6, or when having a plurality of heating devices 6 in the transport direction of the resin film 1, after passing through one heating device. The overheating suppressing liquid 3 may be applied before passing the next heating device. When applying the overheating inhibiting liquid 3 after passing through one heating device, the temperature of the non-applied part 9 is appropriately measured, and the overheating inhibiting liquid 3 is appropriately applied so that the unapplied part 9 is not overheated. Good. Thermography or the like can be used to measure the temperature of the uncoated portion 9.

  The overheating suppressing liquid 3 may be applied at once or divided into a plurality of times. In the case where the application is performed in a plurality of times, at least a part of the transition region 10 so as to cover the boundary portion between the non-application part 9 and the transition region 10 at the stage where the last application of the overheating suppressing liquid 3 is completed. It is sufficient that the overheating suppressing liquid 3 is applied to the unapplied portion 9.

  Examples of the overheating suppressing device 4 include a spray nozzle, a humidifying container, and a slit die. The spray nozzle for spraying and applying the overheating suppression liquid 3 is repelled by the resin film 1 when the surface tension of the overheating suppression liquid 3 is high or the wettability of the resin film 1 is poor. Even in this case, it is preferable because the overheating suppressing liquid 3 can be uniformly applied to the resin film 1 of the unapplied portion 9. Further, as shown in FIG. 6, the humidifying container is filled with the overheating suppressing liquid 3 sprayed in the humidifying container, and the uncoated portion 9 and the transition region 10 are overheated by passing through the humidifying container. Inhibiting liquid 3 is applied. Here, “spraying” refers to blowing out liquid in the form of fine particles.

  The overheating suppression device 4 preferably has a structure that can move to an arbitrary position in the width direction of the resin film 1. By being able to move to an arbitrary position, the resin film 1 meanders, or the width of the application part 8 is changed according to the width of the resin film 1 to be formed, so that the positions of the transition region 10 and the non-application part 9 are Even in the case of a change, the overheating suppressing liquid 3 can be applied to the transition region 10 and the unapplied portion 9.

  The heating device 6 heats and dries the coating liquid 2 and the overheating suppressing liquid 3. Examples of the heating means 7 include a hot air nozzle that is a method for heating an object to be heated by convection heat transfer, and an infrared heater that is a method for heating an object to be heated by radiant heat. Examples of the hot air nozzle include a slit nozzle and a hole nozzle. As a method of heating an object to be heated by radiant heat, an optimum heater may be used in consideration of the absorption wavelength of the resin film 1 or the coating liquid 2, the maximum output of the heater, the life, etc., and is not limited to the infrared heater. . In order to improve the drying speed of the coating liquid 2 as the heating device 6, a hot air nozzle, an infrared heater, and an exhaust nozzle may be arranged. By doing so, the temperature of the resin film 1 and the coating liquid 2 is quickly raised by the radiant heat of the infrared heater, and hot air is blown from the hot air nozzle to the resin film 1 to peel off the evaporation layer near the surface of the resin film 1 and exhaust By exhausting to the outside by the nozzle, the resin film 1 can be quickly heated, the vapor concentration in the vicinity of the coating liquid 2 can be kept low, and the drying speed of the coating liquid 2 can be improved. Further, as the heating device 6, the coating liquid 2 and the overheating suppressing liquid 3 may be heated and dried using a preheating section of the transverse stretching machine 15.

  Although the heating apparatus 6 can select the width | variety heated suitably in the width direction of the resin film 1, it is preferable to heat the width | variety wider than the full width of the resin film 1. FIG. By doing so, it is possible to prevent the coating liquid 2 and the overheating suppressing liquid 3 from being heated even when the resin film 1 meanders and the position of the application portion 8 varies.

  In the above description, the apparatus configuration of the embodiment shown in FIG. 1 has been described. However, the method and apparatus for producing a resin film with a coating film according to the present invention is implemented with the apparatus configuration shown in FIG. Also good. In the apparatus configuration of FIG. 2, the coating liquid 2 is intermittently applied to one or both sides of the resin film 1 continuously conveyed by the coating liquid coating apparatus 5 with a gap in the conveyance direction of the resin film 1. The gap between the coating liquid 2 and the coating liquid 2 becomes an uncoated portion 9, and the uncoated portion 9, the transition region 10, the coated portion 8, the transition region 10, and the uncoated portion 9 are arranged in the transport direction of the resin film 1. The coating liquid 2 is applied. And the overheating suppression liquid 3 is apply | coated to at least one part of the non-application part 9 and the transition area | region 10 so that it may apply to the boundary part of the non-application part 9 and the transition area | region 10 with the overheating suppression apparatus 4. FIG. That is, in the embodiment shown in FIG. 1, the overheating suppression device 4 continuously applied the overheating suppression liquid 3, but in the embodiment shown in FIG. The overheating suppressing liquid 3 is applied intermittently in accordance with the passage of the transition region 10.

  The apparatus for producing a resin film with a coating film of the present invention has at least the width direction of the resin film 1 on the upstream side of the place where the overheating suppressing device 4 in the conveying direction of the resin film 1 is applying the overheating suppressing liquid 3. It is preferable to provide the accompanying air shielding means 21 for shielding the accompanying air in the vicinity of the surface of the resin film 1 accompanying the resin film 1 in the range where the overheating suppressing liquid 3 is applied. An embodiment provided with the accompanying air blocking means 21 is shown in FIG. By providing the accompanying air shielding means 21, when a spray nozzle or a humidifying container is used as the overheating suppressing device 4, the sprayed overheating suppressing liquid 3 is diffused by the accompanying air in the vicinity of the surface of the resin film 1. It can suppress that the overheating suppression liquid 3 to apply | coat to the non-application part 9 and the transition area | region 10 is not carried out. In addition, when the slit die is used as the overheating suppressing device 4 by providing the accompanying air shielding means 21, the liquid film discharged from the slit die is shaken by the accompanying air near the surface of the resin film 1, thereby suppressing overheating. It can suppress that the application | coating thickness of the liquid 3 fluctuates. Examples of the accompanying air shielding means 21 include an air nozzle that blows air in the direction of the resin film 1, a shielding plate installed near the surface of the resin film 1, and a suction nozzle that sucks accompanying air. By blowing air toward the direction of the resin film 1 with the air nozzle, the accompanying air near the surface of the resin film 1 is shielded, and the overheating suppressing liquid 3 can be prevented from diffusing. When air is blown toward the direction of the resin film 1 by the air nozzle, the air blown from the air nozzle is prevented from being diffused by the overheating suppression device 4 in the transport direction of the resin film 1 in order to prevent the overheating suppression liquid 3 from diffusing. It is preferable to blow out so as not to flow downstream. When installing a shielding board, in order to improve the effect which shields the accompanying air of the resin film 1, installing in the surface vicinity of the resin film 1 is preferable. However, since the coating liquid thickness of the coating liquid 2 changes when the shielding plate comes into contact with the coating liquid 2 applied by the coating liquid coating apparatus 5, the shielding plate is preferably not in contact with the coating liquid 2. When the accompanying air is sucked in by the suction nozzle, it is preferable that the overheating suppressing liquid 3 is not sucked by the suction nozzle. Further, the air nozzle and the suction nozzle are combined to install a suction nozzle on the downstream side of the air nozzle in the transport direction of the resin film 1, and the air blown from the air nozzle is downstream of the overheating suppressing device 4 in the transport direction of the resin film 1. May be prevented from flowing into the water. Further, the air nozzle and the shielding plate are combined to install a shielding plate on the downstream side of the air nozzle in the transport direction of the resin film 1, and the air blown from the air nozzle is downstream of the overheating suppressing device 4 in the transport direction of the resin film 1. May be prevented from flowing into the water.

  Examples of the resin film 1 in the present invention include films made of polyester, polyolefin, polyamide, polyphenylene sulfide, acetate, polycarbonate, acrylic resin, and the like. The resin film 1 may be a single layer film or a composite film having a laminated structure of two or more layers. In the composite film, the resin constituting the inner layer portion and the surface layer portion may be a chemically different resin or the same type of resin. Moreover, although the thickness of the resin film 1 is not specifically limited, From points, such as mechanical strength and handling property, 10-500 micrometers is preferable and 20-400 micrometers is more preferable.

  The tension applied per unit width when the resin film 1 is conveyed is preferably 3000 to 10000 N / m. If the tension is within this range, the resin film 1 is less likely to meander or sway vertically up and down with respect to the transport direction, and scratches on the surface of the resin film 1 due to friction with the roll or contact with the heating device 6 occur. The possibility of is reduced.

  Examples of the coating liquid 2 applied to the surface of the resin film 1 include acrylic resins, urethane resins, melamine resins, epoxy resins, and polyester resins. Moreover, the coating liquid 2 may be apply | coated only to the single side | surface of the resin film 1, and may be applied to both surfaces.

  Next, although the said embodiment is described concretely based on an Example, the said embodiment is not necessarily limited to the following examples.

[Example 1]
A chip of polyethylene terephthalate (hereinafter abbreviated as PET) of intrinsic viscosity 0.62 dl / g (measured in o-chlorophenol at 25 ° C. according to the standard of JIS K7367 in 1996) at 180 ° C. After sufficiently vacuum-drying, it is supplied to the extruder 11 shown in FIG. 3 and melted at 285 ° C., extruded into a sheet form from the T-shaped base 12, and a mirror surface cooling drum having a surface temperature of 23 ° C. using an electrostatic application casting method. 13 and cooled and solidified to obtain an unstretched film. Subsequently, in the longitudinal stretching machine 14, the unstretched film was heated with a roll group heated to 80 ° C, and further stretched 3.2 times in the transport direction while being heated with an infrared heater, and a cooling roll adjusted to 50 ° C. It cooled and it was set as the resin film 1 of uniaxial stretching. The width of the resin film 1 was 1000 mm and the thickness was 350 μm.

  Subsequently, the coating liquid 2 was applied to the upper surface of the resin film 1 traveling at a speed of 10 m / min by the coating liquid coating apparatus 5. The width of the application part 8 was 760 mm, the transition regions 10 were provided at both ends of the application part 8 by 20 mm, and the unapplied parts 9 of 100 mm were provided at both ends of the resin film 1. The coating liquid coating apparatus 5 was a rod coating method, and the coating rod was a stainless steel rod having a diameter of 12.7 mm and a length of 1400 mm. The groove specifications of the coating rod were such that the normal groove portion corresponding to the application portion 8 had a groove depth of 106 μm and the groove pitch was 450 μm, and the shallow groove portion corresponding to the transition region 10 had a groove depth of 54 μm and a groove pitch of 250 μm. In addition, there are running sections at both ends of the shallow groove portion in the rod axis direction, and the groove specification is such that the coating liquid thickness gradually decreases from the coating portion 8 to the uncoated portion 9 as shown in FIG. It became. The coating thickness of the coating unit 8 is 30 μm as measured with a moisture meter (RX-200, manufactured by Kurashiki Boseki Co., Ltd.) at the outlet of the coating solution coating device 5. The liquid thickness was 15 μm (50% of the coating liquid thickness of 30 μm of the application part 8).

  Subsequently, the overheating suppression device 3 was applied to a part of the transition region 10 and the unapplied portion 9 so as to cover the boundary portion between the unapplied portion 9 and the transition region 10 with the overheating suppression device 4. As the overheating suppression device 4, a spray nozzle was used, and normal temperature pure water was sprayed and applied as the overheating suppression solution 3. The overheating suppressing liquid 3 was applied to a part of the transition region 10 and the uncoated portion 9 so as to have the same coating liquid thickness, and the uncoated portion 9 was measured with a moisture meter immediately after the overheating suppressing device 4, The coating thickness of the overheating inhibitor 3 was 14 μm.

  Subsequently, as the heating device 6, a heating device in which hot air nozzles and hot air discharge mechanisms are alternately arranged in the conveying direction of the resin film 1 is used, and the coating liquid 2 and the overheating suppressing liquid 3 are heated from the upper surface of the resin film 1 to overheat. After the drying of the suppression liquid 3 and the coating liquid 2 in the transition region 10 was completed, the drying of the coating liquid 2 in the coating unit 8 was completed.

  Thereafter, in the transverse stretching machine 15, the resin film with a coating film is introduced into a 90 ° C. oven that is a preheating section and heated, and subsequently, the resin film with a coating film 3 in the width direction in a 100 ° C. oven that is a stretching section. Stretched 5 times, and further heat-fixed the resin film with a coating film while relaxing 5% in the width direction in an oven at 220 ° C., which is a heat setting section, to form a coating film with coating liquid 2 on one side. An axially stretched film was obtained. The tension between the longitudinal stretching machine 14 and the lateral stretching machine 15 was controlled by a dancer roll so that the tension per unit width in the running direction of the resin film 1 was 8000 N / m.

  Coating liquid 2 is a polyester copolymer emulsion (containing components: terephthalic acid 90 mol%, 5-sodium sulfoisophthalic acid 10 mol%, ethylene glycol 96 mol%, neopentyl glycol 3 mol%, diethylene glycol 1 mol%) 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 μm Was added to 1 part by mass. The viscosity of this coating liquid 2 was 2 mPa · s at a temperature of 25 ° C. Further, when the temperature of the resin film 1 was measured by thermography (TVS-500EX, manufactured by NEC Avio Infrared Technology Co., Ltd.) at the outlet of the coating liquid coating apparatus 5, the coating part 8 and the transition region 10 were 25 to 26 ° C., not coated. Part 9 was 28-29 ° C.

  In the heating device 6, 8 units of hot air nozzles and 9 units of hot air discharge mechanisms were alternately arranged in the conveying direction of the resin film 1. The material of the hot air nozzle is stainless steel (SUS304). The size of the hot air nozzle is 200 mm in the conveyance direction of the resin film 1, 1700 mm in the width direction, and the gap with the resin film 1 is 30 mm. Was installed. The hot air discharge mechanism is made of stainless steel (SUS304), and the size of the hot air discharge mechanism is 100 mm in the conveyance direction of the resin film 1 and 1700 mm in the width direction. The hot air blowing part of the hot air nozzle was a punching metal in which holes with a diameter of 3 mm were formed in a zigzag-like uniform distribution, and air heated to 80 ° C. was blown out at a wind speed of 20 m / s. The suction flow rate from the hot air discharge mechanism was the same as the total flow rate of hot air blown from the hot air nozzle.

  The method for evaluating the presence or absence of overheating in the uncoated portion 9 and the transition region 10 is a thermography (TVS-500EX, manufactured by NEC Avio Infrared Technology Co., Ltd.) at the outlet of the heating device 6. And the temperature of the highest part was confirmed to be 70 ° C. or less which is an allowable temperature. This allowable temperature is a temperature determined by repeating the experiment.

  As a result of producing a resin film with a coating film using this apparatus, the temperature of the uncoated portion 9 was 66 ° C., and the temperature of the transition region 10 was 65 ° C., which was within the allowable range, and stable production was possible.

[Example 2]
The thickness of the overheating suppressing liquid 3 applied by the overheating suppressing device 4 with the groove specification of the shallow groove portion corresponding to the transition region 10 of the coating rod used in the coating liquid applying apparatus 5 being a groove depth of 77 μm and a groove pitch of 400 μm. A resin film with a coating film was produced under the same conditions as in Example 1 except that the thickness was 7 μm. In addition, when it measured with the moisture meter at the exit of the coating liquid application apparatus 5, the coating liquid thickness of the location except the run-up section of the transition area 10 was 22 micrometers (about 73% of the coating liquid thickness 30 micrometers of the application part 8). . As a result, the temperature of the uncoated part 9 was 70 ° C., the temperature of the transition region 10 was 57 ° C., which was within the allowable range, and stable production was possible.

[Example 3]
The thickness of the overheating suppressing liquid 3 applied by the overheating suppressing device 4 with the groove specification of the shallow groove portion corresponding to the transition region 10 of the coating rod used in the coating liquid applying apparatus 5 being a groove depth of 25 μm and a groove pitch of 200 μm. A resin film with a coating film was produced under the same conditions as in Example 1 except that the thickness was 21 μm. In addition, when it measured with the moisture meter at the exit of the coating liquid application apparatus 5, the coating liquid thickness of the location except the run-up section of the transition area 10 was 8 micrometers (about 27% of the coating liquid thickness 30 micrometers of the application part 8). . As a result, the temperature of the uncoated part 9 was 59 ° C. and the temperature of the transition region 10 was 69 ° C., which was within the allowable range, and stable production was possible.

[Comparative Example 1]
A resin film with a coating film was produced under the same conditions as in Example 1 except that the overheating suppressing liquid 3 was not applied to the uncoated portion 9 and the transition region 10. Since the temperature of the uncoated part 9 exceeded 74 ° C. and the allowable temperature, the shipment of the product was abandoned.

[Comparative Example 2]
Production of a resin film with a coating film under the same conditions as in Example 1 except that the transition region 10 is not provided by the coating liquid application device 5 and the overheating suppression liquid 3 is not applied to the transition region 10 by the overheating suppression device 4. went. The temperature of the uncoated part 9 was 66 ° C., which was within the allowable range, but due to the meandering of the resin film 1, a part where the overheating suppressing liquid 3 was applied to a part of the coated part 8 occurred. Due to the lack of temperature rise, the resin film 1 was torn during stretching with the transverse stretching machine 15, and the production of the resin film with a coating film was interrupted.

  The present invention can be applied not only to the production of a resin film with a coating film but also to the production of a metal foil with a coating film or a paper with a coating film, but the application range is not limited thereto.

DESCRIPTION OF SYMBOLS 1 Resin film 2 Coating liquid 3 Overheating suppression liquid 4 Overheating suppression apparatus 5 Coating liquid application apparatus 6 Heating apparatus 7 Heating means 8 Application part 9 Unapplied part 10 Transition area 11 Extruder 12 Base 13 Cooling drum 14 Longitudinal stretching machine 15 Horizontal stretching machine 16 Winding device 21 Accompanied air shielding means

Claims (11)

A step of applying a coating liquid on one or both sides of a resin film being transported, wherein an application part where the coating liquid is applied to an arbitrary thickness and an uncoated part where the coating liquid is not applied A transition region in which the coating liquid is applied with a thickness thinner than that of the application portion,
Step B for applying an overheating suppressing liquid to at least a part of the transition region and the uncoated portion so as to cover the boundary portion between the uncoated portion and the transition region;
Step C of forming the coating film on the resin film by heating and drying and solidifying the coating liquid of the application part and the transition region, heating the overheating suppression liquid, and drying the overheating suppression liquid.
The manufacturing method of the resin film with a coating film which has NO.   The method for producing a resin film with a coating film according to claim 1, wherein in step C, drying of the overheating suppressing liquid and the coating liquid in the transition region is completed before the drying of the coating liquid in the application portion is completed.   The manufacturing method of the resin film with a coating film of Claim 1 or 2 which apply | coats a coating liquid so that the said non-application part may be formed in the width direction both sides of the resin film of the said application part in the said process A.   The manufacturing method of the resin film with a coating film in any one of Claims 1-3 which apply | coats the sprayed said overheating suppression liquid in the said process B.   In the step B, at the upstream side of the location where the overheating suppression liquid is applied in the direction of transporting the resin film, at least the overheating suppression liquid in the resin film width direction is applied in the range where the overheating suppression liquid is applied. The manufacturing method of the resin film with a coating film in any one of Claims 1-4 which shields. A coating liquid application device that applies a coating liquid to one or both sides of a resin film being transported, where the coating liquid is applied to an arbitrary thickness, and the coating section and the coating liquid are not applied. A transition region in which the coating liquid is applied with a thickness thinner than that of the application part,
An overheating suppressing device that applies an overheating suppressing liquid to at least a part of the transition region and the uncoated portion so as to cover a boundary portion between the uncoated portion and the transition region;
A heating device that heats the coating liquid of the application unit, the coating liquid of the transition region, and the overheating suppression liquid;
An apparatus for producing a resin film with a coating film comprising:   The apparatus for producing a resin film with a coating film according to claim 6, wherein the coating liquid coating apparatus applies the coating liquid so that the uncoated part is formed on both sides in the width direction of the resin film of the coated part.   The manufacturing apparatus of the resin film with a coating film of Claim 6 or 7 in which the said overheating suppression apparatus is movable to the arbitrary positions of the width direction of the said resin film.   The coating liquid application device includes a coating rod having a groove processed on a surface over a predetermined range in the rod axis direction and a coating liquid supply means, and the coating rod has a normal groove portion having an arbitrary groove depth, The apparatus for producing a resin film with a coating film according to any one of claims 6 to 8, further comprising a shallow groove portion in which a groove shallower than the normal groove portion is formed on both sides of the normal groove portion in the rod axis direction.   The apparatus for producing a resin film with a coating film according to any one of claims 6 to 9, wherein the overheating suppressing device sprays and applies the overheating suppressing liquid.   On the upstream side of the overheating suppression device in the direction of transport of the resin film, provided with accompanying air shielding means for shielding the accompanying air of the resin film in a range where at least the overheating suppression liquid in the resin film width direction is applied. The manufacturing apparatus of the resin film with a coating film in any one of Claims 6-10.