Laminated film manufacturing method and manufacturing device

Abstract

This apparatus is provided with: a first coating section (30a) in which a first coating solution is ejected onto a base material layer (101) from a first nozzle row arranged in the direction of the width of the base material layer (101) at a first position that is opposite to the base material layer (101) to form a first coating layer (102a); and a second coating section (30b) in which a second coating solution is ejected onto the surface of the first coating layer from a second nozzle row arranged in the direction of the width of the base material layer (101) at a second position that is located on the downstream side of the first position and is opposite to the first coating layer (102a). According to this configuration, it becomes possible to highly efficiently apply a coating solution that is a mixture of a plurality of solutions onto a laminated film.

Description

[Technical Field]

[0001] The present invention relates to a technique for producing a laminated film. [Background technology]

[0002] It is known that a coating liquid that realizes a specific function is applied to the surface of a stretched resin film to form a coating layer, and then the coating layer is dried to form a laminated film having various functions on the surface.

[0003] Alternatively, a coating solution containing two or more highly reactive components, such as a polymerizable compound and a polymerization initiator, or a coupling agent and an organic or inorganic compound that reacts with the polymerizable compound, may be applied to the surface of a film, and the components may be reacted in the coating layer to form a surface layer containing the reaction product.

[0004] A known method for applying a coating liquid to a film is, for example, a roll coater, which supplies the liquid to an application roller and rotates the application roller in contact with the film in accordance with the transport of the film, thereby applying the liquid to the film.

[0005] A known example of a roll coater is the reverse gravure coater, which applies a coating liquid to an engraved roll (gravure roll), scrapes the surface of the gravure roll mainly with a blade, and transfers the coating liquid that has accumulated in the engraved recesses onto a film to form a coating layer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-346534 [Non-patent literature]

[0007] [Non-Patent Document 1] Katsuhiro Omori, "Roll to Roll Wet Coating Equipment", [online], March 26, 2006, Surface Technology, [Retrieved April 12, 2022], Internet<URL:https: / / www.jstage.jst.go.jp / article / sfj / 60 / 7 / 60_7_435 / _pdf / -char / ja> Summary of the Invention [Problem to be solved by the invention]

[0008] However, in such conventional laminate film manufacturing methods, when a coating liquid containing two or more highly reactive components is used, it takes time from preparing the coating liquid to supplying it to the application roller, and the components may react during this time, resulting in problems such as reduced coatability or inactivation of the components.

[0009] One object of the present invention is to efficiently coat a coating solution containing multiple mutually reactive components onto a laminated film. [Means for solving the problem]

[0010] Therefore, this method for manufacturing a laminated film is a method for manufacturing a laminated film in which a coating layer is formed on a base layer, and includes a first coating process in which, while transporting the base layer, a first coating liquid is ejected onto the base layer from a first nozzle row arranged in the width direction of the base layer at a first position opposite the base layer to form a first coating layer, and a second coating process in which a second coating liquid is ejected onto the surface of the first coating layer from a second nozzle row arranged in the width direction of the base layer at a second position downstream of the first position and opposite the first coating layer. [Effects of the Invention]

[0011] According to one embodiment, when a coating liquid containing multiple mutually reactive components is applied to a film surface, the mutually reactive components are separately formulated into first and second coating liquids, which are then applied sequentially in the first and second coating steps, allowing the two components to react in the coating layer to obtain the desired coating layer. In other words, since it is not necessary to keep the multiple mutually reactive components in the same liquid phase for a long period of time, it is possible to prevent the two components from reacting with each other before coating, which would result in a decrease in coatability, or the components from being deactivated before coating, and it is possible to efficiently apply a coating liquid containing multiple mutually reactive components to a laminate film. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating a configuration of a laminated film manufacturing system as an example of an embodiment; [Figure 2] 1 is a diagram schematically illustrating an example of the configuration of a longitudinal stretching device of a laminated film manufacturing system as an example of an embodiment. [Figure 3] 1 is a diagram schematically illustrating a configuration example of a transverse stretching device of a laminated film manufacturing system as an example of an embodiment. [Figure 4] 1 is a diagram illustrating an inkjet ejection device of a laminated film manufacturing system as an example of an embodiment. [Figure 5] 1 is a diagram illustrating an example of the arrangement of inkjet ejection devices in a laminated film manufacturing system according to an embodiment; [Figure 6] 1 is a diagram illustrating an example of a nozzle row of an inkjet head of an inkjet ejection device of a laminated film manufacturing system as an example of an embodiment. FIG. [Figure 7] 1 is a diagram illustrating an example of the arrangement of inkjet heads of an inkjet ejection device in a laminated film manufacturing system as an example of an embodiment. [Figure 8] 1 is a diagram illustrating an example of the arrangement of inkjet heads of an inkjet ejection device in a laminated film manufacturing system as an example of an embodiment. [Figure 9] 1 is a diagram illustrating an example of the arrangement of inkjet heads of an inkjet ejection device in a laminated film manufacturing system as an example of an embodiment. [Figure 10] 10A and 10B are diagrams illustrating a modified example of an inkjet ejection device of a laminated film manufacturing system as an example of an embodiment. [Figure 11] 10A and 10B are diagrams illustrating a modified example of an inkjet ejection device of a laminated film manufacturing system as an example of an embodiment. [Figure 12] 10A and 10B are diagrams illustrating a modified example of an inkjet ejection device of a laminated film manufacturing system as an example of an embodiment. [Figure 13] FIG. 10 is a diagram schematically illustrating an example of the arrangement of inkjet ejection devices in a modified example of a laminated film manufacturing system as an example of an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the manufacturing method and manufacturing apparatus for the present laminated film will be described with reference to the drawings. However, the embodiments shown below are merely examples, and are not intended to exclude the application of various modifications and techniques not explicitly stated in the embodiments. In other words, the present embodiment can be implemented with various modifications within the scope of its purpose. Furthermore, each figure does not intend to include only the components shown in the figure, but can also include other functions, etc.

[0014] (A) Configuration Fig. 1 is a diagram illustrating the configuration of a laminated film manufacturing system 1 as one example of an embodiment. Note that Fig. 1 shows an example in which a base layer is manufactured by a sequential biaxial stretching method, but the method for manufacturing the base layer is not limited to this, and the base layer may be manufactured by, for example, a uniaxial stretching method, a non-stretching method, or any other known method.

[0015] The laminated film manufacturing system 1 of the present invention produces a laminated film 100. The laminated film 100 has a laminated structure in which a coating layer 102 is formed on a base layer 101. The base layer 101 represents a "cast film layer formed by extruding a resin composition" (hereinafter, sometimes simply referred to as a "cast film layer") until the first stretching step is completed, represents a "first stretched layer" after the first stretching step and until the second stretching step is completed, and represents a "substrate layer" after the second stretching step is completed.

[0016] The base layer 101, i.e., the material for forming the base layer, may be a resin composition containing a thermoplastic resin.

[0017] Examples of thermoplastic resins include olefin polymers, polyamides, polyesters, polycarbonates, polystyrenes, poly(meth)acrylates, polyvinyl chlorides, and mixed resins thereof. Among these, olefin polymers are preferred from the viewpoint of water resistance and solvent resistance.

[0018] As the olefin polymer, propylene polymers such as polypropylene, ethylene polymers such as polyethylene, etc. can be preferably used.

[0019] The resin composition may further contain a filler. The filler may be inorganic or organic, and examples of inorganic fillers include calcium carbonate, calcined clay, silica, diatomaceous earth, talc, titanium oxide, barium sulfate, and alumina. The organic filler is preferably organic particles that are incompatible with the thermoplastic resin, have a melting point or glass transition temperature higher than that of the thermoplastic resin, and are finely dispersed under the melt-kneading conditions of the thermoplastic resin. For example, when the thermoplastic resin is a polyolefin-based resin, the organic filler is preferably polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon-6, nylon-6,6, a homopolymer of a cyclic olefin, or a copolymer of a cyclic olefin and ethylene, which has a melting point of 120°C to 300°C or a glass transition temperature of 120°C to 280°C.

[0020] The resin composition may further contain stabilizers, light stabilizers, dispersants, lubricants, fluorescent whitening agents, colorants, etc., as required.

[0021] The base layer 101 may have a single layer structure or a multi-layer structure of two or more layers.

[0022] The laminated film manufacturing system 1 illustrated in FIG. 1 includes raw material silos 10a and 10b, a granulator 11, a pellet silo 12, an extruder 13, a longitudinal stretching device 14, a transverse stretching device 16, and inkjet ejection devices 30a and 30b.

[0023] Each of the raw material silos 10a, 10b, granulator 11, pellet silo 12, extruder 13, longitudinal stretching device 14, transverse stretching device 16, and inkjet ejection devices 30a, 30b that make up the laminated film manufacturing system 1 realizes the manufacturing process for producing the laminated film 100.

[0024] The raw material silos 10a and 10b store the raw materials for the laminated film 100. The raw materials for the laminated film 100 include, for example, thermoplastic resin, filler, and optional additives. Although the number of raw material silos in Fig. 1 is two, any number of silos may be provided.

[0025] The raw materials of the laminated film 100 may include recycled materials produced by processing scraps generated during the cutting process or the like when the laminated film 100 is formed.

[0026] The raw materials stored in the raw material silos 10a and 10b are fed into a granulator 11.

[0027] The granulator 11 adds fillers and various additives to the thermoplastic resin raw material as required to produce pellets of the resin composition.

[0028] The pellet silo 12 stores the pellets produced by the granulator 11. The pellet silo 12 supplies the pellets stored therein to the extruder 13.

[0029] The extruder 13 extrudes the molten resin composition in the form of a sheet from an extruder die (not shown) to produce the base layer 101, which is a cast film layer.

[0030] The extruder 13 forms the base layer 101, which is a cast film layer, by extruding a molten resin composition in the form of a sheet from an extruder die (not shown). The base layer 101 extruded from the extruder 13, i.e., the cast film layer, is transported by transport rollers (not shown) and supplied to a longitudinal stretching device 14 (described later). Hereinafter, the thick black arrow in the figure indicates the flow direction of the base layer 101.

[0031] The longitudinal stretching device 14 is disposed downstream of the base layer 101 extruded from the extruder 13, that is, the cast film layer, in the flow direction (transport direction).

[0032] The longitudinal stretching device 14 stretches the base layer 101 extruded from the extruder 13, i.e., the cast film layer, in the flow direction of the base layer 101. Hereinafter, the flow direction (conveyance direction) of the base layer 101 may be referred to as the longitudinal direction. The longitudinal direction corresponds to the first direction.

[0033] The longitudinal stretching device 14 corresponds to a first stretching device that stretches the base layer 101 (cast film layer) in the longitudinal direction (first direction). The longitudinal stretching device 14 also performs a first stretching step that stretches the base layer 101 (cast film layer) in the longitudinal direction (first direction).

[0034] In the longitudinal stretching device 14, for example, a plurality of conveying rollers (three in the example shown in FIG. 1) are arranged parallel to one another in a direction perpendicular to the longitudinal stretching direction. Then, between these conveying rollers, for example, by making a difference in peripheral speed of the conveying rollers, tension in the longitudinal direction is applied to the cast film layer, and the layer is stretched in the longitudinal direction. That is, the longitudinal stretching device 14 may perform inter-roll stretching using the difference in peripheral speed of the rolls.

[0035] When the thermoplastic resin used is an amorphous resin, the stretching temperature is preferably in the range of the glass transition temperature of the thermoplastic resin or higher. When the thermoplastic resin is a crystalline resin, the stretching temperature is preferably in the range of the glass transition temperature of the amorphous part of the thermoplastic resin or higher and the melting point of the crystalline part of the thermoplastic resin or lower, and is preferably 2 to 60°C lower than the melting point of the thermoplastic resin. Specifically, in the case of a propylene homopolymer (melting point 155°C to 167°C), the stretching temperature is preferably 100°C to 164°C, and in the case of a high-density polyethylene resin (melting point 121°C to 134°C), the stretching temperature is preferably 70 to 133°C.

[0036] The stretching speed is not particularly limited, but is preferably within the range of 20 m / min to 350 m / min from the viewpoint of stable stretching.

[0037] The stretching ratio can also be appropriately determined taking into consideration the properties of the thermoplastic resin used, etc. For example, when a propylene-based resin is used and biaxially stretched, the lower limit of the stretching ratio, in terms of area stretching ratio, is usually 1.5 times or more, preferably 4 times or more, and the upper limit is usually 60 times or less, preferably 50 times or less.

[0038] FIG. 2 is a diagram schematically illustrating an example of the configuration of the longitudinal stretching device 14 of the laminated film manufacturing system 1 as one example of the embodiment.

[0039] 2, four conveying rollers 141a, 141b, 141c, and 141d are arranged with their rotation axes parallel to one another and perpendicular to the vertical direction. The four conveying rollers 141a, 141b, 141c, and 141d are arranged in the flow direction of the base layer 101 in the following order: conveying roller 141a, conveying roller 141b, conveying roller 141c, and conveying roller 141d. Hereinafter, when there is no need to distinguish between the conveying rollers 141a, 141b, 141c, and 141d, they will be referred to as conveying rollers 141.

[0040] Each of these transport rollers 141 is configured to be rotatable around a rotation axis by a drive motor (not shown), and rotates in a direction following the flow of the base layer 101 while in contact with the base layer 101 .

[0041] Furthermore, the rotation speed of the drive motor of each conveying roller 141 is controlled so that the circumferential speed of the conveying roller 141 located downstream in the flow direction of the base layer 101 is increased. As a result, tension is generated in the base layer 101 between adjacent conveying rollers 141 along the flow direction of the base layer 101, and the base layer 101 is stretched in the longitudinal direction.

[0042] In addition, other conveying rollers (not shown) are also provided on the conveying path of the base layer 101 to convey the base layer 101 downstream. These conveying rollers correspond to a conveying device that conveys the base layer (substrate layer) 101. The base layer 101 that has been stretched in the longitudinal direction by the longitudinal stretching device 14 is conveyed to the transverse stretching device 16, which is the next process.

[0043] The transverse stretching device 16 is disposed downstream of the longitudinal stretching device 14 .

[0044] The transverse stretching device 16 stretches the base layer 101 (first stretched layer) stretched by the longitudinal stretching device 14 in a direction (transverse direction, width direction) perpendicular to the longitudinal direction. The transverse direction corresponds to the second direction.

[0045] The transverse stretching device 16 corresponds to a second stretching device that stretches the base layer 101 (first stretched layer) in a transverse direction (width direction, second direction) perpendicular to the longitudinal direction (first direction). The transverse stretching device 16 also performs a second stretching step in which the base layer 101 (first stretched layer) stretched by the longitudinal stretching device 14 is stretched in a transverse direction (width direction, second direction) perpendicular to the longitudinal direction (first direction).

[0046] In the second stretching step, as in the first stretching step, the base layer 101 is heated to a stretching temperature according to the type of thermoplastic resin used and stretched.

[0047] FIG. 3 is a diagram schematically illustrating an example of the configuration of the transverse stretching device 16 of the laminated film manufacturing system 1 as one example of the embodiment.

[0048] The transverse stretching device 16 is provided with a plurality of clips 161 (six in the example shown in FIG. 3) that grip the edges of the base layer 101, which is the first stretching layer. These clips 161 are arranged in pairs at positions that face each other across the base layer 101 on each of the two edges of the base layer 101. In the example shown in FIG. 3, three pairs of clips 161 are provided along the machine direction of the base layer 101.

[0049] Of these multiple clips 161, pairs of clips 161 are provided at opposing positions across the base layer 101, and while each grips an edge portion of the base layer 101, they move away from each other, thereby pulling and stretching the base layer 101, i.e., the first stretching layer, in the lateral direction (width direction).

[0050] The clips 161 gripping the base layer 101 stretch the base layer 101 in the width direction while moving in the flow direction following the transport of the base layer 101, and release the base layer 101 at a predetermined position. Thereafter, each clip 161 returns to an upstream position in the transport direction of the base layer 101 and grips the base layer 101 again. In this way, the transverse stretching device 16 uses multiple clips 161 to repeatedly grip, stretch, and release the base layer 101, thereby stretching the base layer 101 in the transverse direction. That is, the transverse stretching device 16 performs clip stretching using a tenter oven. The base layer 101 stretched in the transverse direction by the transverse stretching device 16 is transported to the inkjet ejection devices 30a and 30b, which is the next process.

[0051] A plurality of inkjet discharge devices 30a, 30b (two in the example shown in FIG. 1) are provided downstream of the transverse stretching device 16. The inkjet discharge device 30b is arranged next to the inkjet discharge device 30a downstream in the flow direction of the base layer 101. The inkjet discharge device 30a may be referred to as the first inkjet discharge device 30a. The inkjet discharge device 30b may be referred to as the second inkjet discharge device 30b.

[0052] The inkjet ejection devices 30a and 30b each eject a coating liquid onto the surface of the base layer 101 (substrate layer) that is stretched by the transverse stretching device 16 and transported in the vertical direction (flow direction), thereby forming a uniform coating layer on the first side (surface) of the base layer 101.

[0053] The inkjet discharge device 30a discharges a first coating liquid, and the inkjet discharge device 30b discharges a second coating liquid. By discharging the second coating liquid before the first coating liquid dries, the first coating liquid and the second coating liquid are mixed on the base layer 101, and a layer of the mixed liquid (mixed liquid layer) is formed on the base layer 101. If a component contained in the first coating liquid and a component contained in the second coating liquid are mutually reactive, the two components react in the mixed liquid obtained by mixing the first coating liquid and the second coating liquid, and this mixed liquid is dried (cured) on the base layer 101, thereby realizing the function as a functional material.

[0054] The combination of mutually reactive components contained in the first and second coating fluids is preferably one that has high reactivity. Examples include a combination of a photopolymerizable compound and a photopolymerization initiator, a combination of a crosslinkable compound and a crosslinking agent, a combination of a resin such as urethane and a coupling agent, and a combination of an epoxy resin and an amine-based curing agent. The combination of mutually reactive components contained in the first and second coating fluids may be other than those listed above and can be varied as appropriate.

[0055] As described above, the inkjet discharge device 30b is disposed downstream of the inkjet discharge device 30a in the flow direction of the base layer 101. Therefore, the inkjet discharge device 30b discharges the second coating liquid onto the surface of the first coating layer formed by the inkjet discharge device 30a discharging the first coating liquid onto the base layer 101. As a result, the first coating liquid and the second coating liquid are mixed on the base layer 101, and a coating layer of a two-liquid mixed liquid is formed.

[0056] Hereinafter, when there is no need to distinguish between the inkjet ejection devices 30a and 30b, they will be referred to as the inkjet ejection device 30.

[0057] The inkjet ejection device 30 performs a coating process in which a coating solution is ejected onto the base layer 101 (substrate layer) from a nozzle row arranged in a direction (horizontal direction) perpendicular to the transport direction (vertical direction) of the base layer 101 to form a coating layer 102. The nozzle row is formed by arranging a plurality of nozzles in a row.

[0058] FIG. 4 is a diagram for explaining inkjet ejection devices 30a and 30b of a laminated film manufacturing system 1 as one example of an embodiment.

[0059] The inkjet ejection devices 30a and 30b are arranged along the width direction at positions facing the surface of the base layer 101. The inkjet ejection device 30b is arranged next to the inkjet ejection device 30a at a position downstream of the inkjet ejection device 30a in the flow direction of the base layer 101.

[0060] 4, the first coating layer formed by the inkjet discharge device 30a discharging the first coating liquid onto the base layer 101 is indicated by the reference symbol 102a, and the second coating layer formed by the inkjet discharge device 30b discharging the second coating liquid onto the first coating layer 102a is indicated by the reference symbol 102b. The second coating layer 102b is a mixed liquid layer of the first coating liquid and the second coating liquid, and may contain a reaction product of a component contained in the first coating liquid and a component contained in the second coating liquid.

[0061] Furthermore, a reverse rotation roller (not shown) may be disposed downstream of the inkjet ejection device 30b.

[0062] The reverse-rotating roller rotates in the opposite direction to the flow direction of the transported base layer 101 while in contact with the surface of the base layer 101, thereby mixing the first coating layer 102a and the second coating layer 102b formed on the surface of the base layer 101 and generating a mixed liquid layer.

[0063] Hereinafter, when there is no need to distinguish between the coating layers 102a and 102b, they will be referred to as the coating layer 102.

[0064] Furthermore, on the transport path of the base layer 101, the inkjet ejection device 30b may be disposed at any position.

[0065] FIG. 5 is a diagram illustrating an example of the arrangement of inkjet ejection devices 30a and 30b in a laminated film manufacturing system 1 as one example of an embodiment.

[0066] In FIG. 5, the symbol (A) indicates an example in which the inkjet ejection device 30a and the inkjet ejection device 30b are arranged side by side so as to be adjacent to each other.

[0067] In this way, by arranging the inkjet ejection device 30a and the inkjet ejection device 30b adjacent to each other on the transport path of the base layer 101 and positioning the position where the second coating layer 102b (mixed liquid layer) is formed on the base layer 101 as upstream as possible on the transport path of the base layer 101, the second coating layer 102b can be dried (hardened) during the transport process of the base layer 101.

[0068] 5, the symbol (B) indicates an example in which the inkjet ejection device 30a and the inkjet ejection device 30b are arranged apart from each other by a predetermined threshold or more.

[0069] For example, when gas is generated by mixing a second coating liquid with the first coating layer 102a, by arranging the inkjet ejection device 30b near a ventilation facility (not shown), the generated gas can be efficiently processed. The threshold value may be set relatively based on, for example, the positions of the inkjet ejection device 30a and the ventilation facility.

[0070] Also, the installation position of the inkjet ejection device 30b may be set such that the conveyance path distance (L) between the inkjet ejection device 30a and the inkjet ejection device 30b satisfies the condition L < V × T based on the time (T) required for the coating layer 102a formed by the inkjet ejection device 30a to dry and the conveyance speed (V) of the base layer 101. Thereby, the second coating process by the inkjet ejection device 30b can be carried out before the coating layer 102a (the first coating layer) dries after the first coating process by the inkjet ejection device 30a.

[0071] In the inkjet ejection device 30, a plurality of inkjet heads 310 (see FIG. 7 etc.) are arranged at positions facing the base layer 101.

[0072] At each inkjet head 310, a plurality of inkjet nozzles (discharge ports) for discharging the coating liquid in a particle state are formed at positions facing the base layer 101. In the inkjet head 310, the plurality of inkjet nozzles may be formed so as to form a row.

[0073] The inkjet nozzle may simply be referred to as a nozzle. Also, a row of a plurality of nozzles formed in the inkjet head 310 may be referred to as a nozzle row. One or more nozzle rows may be formed in the inkjet head 310.

[0074] FIG. 6 is a diagram illustrating a nozzle row of the inkjet head 310 of the inkjet ejection device 30 of the laminate film manufacturing system 1 as an example of an embodiment.

[0075] Inkjet head 310 has a plurality of nozzles (inkjet nozzles) formed at positions facing base layer 101. 6, black circles represent nozzles formed in the inkjet head 310. In Fig. 6, symbol (A) indicates an example in which one nozzle row is formed in the inkjet head 310, and symbol (B) indicates an example in which two nozzle rows are formed in the inkjet head 310.

[0076] The discharge of the coating liquid from each nozzle in the inkjet head 310 is controlled by a coating control unit 400 (see FIG. 4). The coating control unit 400 controls the discharge of the coating liquid from each nozzle in each inkjet head 310. For example, the coating control unit 400 can precisely control the amount of coating liquid discharged by controlling the on / off switching of discharge from each inkjet nozzle.

[0077] The function of the coating control unit 400 is realized by the processor of a computer (not shown) executing driver software.

[0078] The coating control unit 400 controls the on / off of ejection for any of the multiple nozzles formed in each inkjet head 310, thereby controlling the ejection of coating fluid from a specific nozzle in the inkjet head 310 or preventing ejection from a nozzle. Driver software that controls the ejection of the inkjet head 310 is known, and a detailed description thereof will be omitted.

[0079] In the inkjet head 310, the nozzles that eject the coating liquid may be referred to as ejection nozzles, and the region including the ejection nozzles may be referred to as the ejection nozzle region.

[0080] In addition, in the inkjet head 310, the nozzles from which the ejection of the coating liquid is suppressed may be referred to as ejection suppression nozzles, and the region including the ejection suppression nozzles may be referred to as ejection suppression nozzle region.

[0081] The nozzle row formed in the inkjet head 310 provided in the inkjet ejection device 30a corresponds to the first nozzle row. The inkjet ejection device 30a corresponds to a first coating section that ejects a first coating liquid onto the base layer 101 (substrate layer) from the first nozzle row arranged in the width direction of the base layer 101 at a first position facing the base layer 101 to form a coating layer 102a (first coating layer).

[0082] The nozzle row formed in the inkjet head 310 provided in the inkjet ejection device 30b corresponds to the second nozzle row. The inkjet ejection device 30b corresponds to a second coating unit that ejects a second coating liquid onto the surface of the coating layer 102a (first coating layer) from the second nozzle row arranged in the width direction of the base layer 101 at a second position that is downstream of the first position and faces the coating layer 102a (first coating layer).

[0083] In addition, the inkjet ejection device 30a realizes a first coating process in which a first coating liquid is ejected onto the base layer 101 (substrate layer) from a first nozzle row arranged in the width direction of the base layer 101 at a first position facing the base layer 101 (base material layer) to form a coating layer 102a (first coating layer).

[0084] The inkjet ejection device 30b realizes a second coating process in which a second coating liquid is ejected onto the surface of the coating layer 102a (first coating layer) from a second nozzle row arranged in the width direction of the base layer 101 at a second position downstream of the first position and facing the coating layer 102a (first coating layer).

[0085] The inkjet heads 310 are arranged side by side in the width direction of the base layer 101, with the nozzle rows facing the surface of the base layer 101.

[0086] 7 to 9 are diagrams showing examples of the arrangement of the inkjet heads 310 of the inkjet ejection device 30 of the laminated film manufacturing system 1 as one example of the embodiment.

[0087] In the first example shown in FIG. 7, in the inkjet ejection device 30, a plurality of inkjet heads 310-1 to 310-5 (five in the example shown in FIG. 7) are arranged in a row across the entire width direction (left-right direction in the figure) of the base layer 101.

[0088] When there is no need to distinguish between the inkjet heads 310-1 to 310-5, they will be referred to as inkjet heads 310.

[0089] A plurality of inkjet heads 310 arranged in a line may be referred to as an inkjet head array. In the example shown in Figure 7, the inkjet head array is denoted by reference numeral 300.

[0090] In the example shown in FIG. 7, the length of the five inkjet heads 310-1 to 310-5 arranged in series is approximately equal to the length of the base layer 101 in the width direction.

[0091] 7, the inkjet heads 310-1 and 310-5 arranged at both ends have ejection suppression nozzle regions that face a predetermined range from the edge of the base layer 101. In Fig. 7, the ejection suppression nozzle region of the inkjet head 310 is indicated by the reference symbol 310b, and the ejection nozzle region is indicated by the reference symbol 310a.

[0092] The coating control unit 400 controls the inkjet heads 310-1 to 310-5 to discharge the coating liquid from the discharge nozzle region 310a onto the base layer 101. As a result, the coating liquid is discharged in the form of particles from each nozzle in the discharge nozzle region 310a of each inkjet head 310.

[0093] A uniform coating layer 102 is formed on the surface of the base layer 101 at a position facing the discharge nozzle region 310a in the width direction of the base layer 101. In Figure 7, the region of the base layer 101 where the coating layer 102 is formed (coating layer region) is indicated by the reference symbol 100b.

[0094] Furthermore, the coating control unit 400 inhibits the inkjet heads 310-1 and 310-5 provided at both ends of the inkjet head array 300 from ejecting the coating liquid from the ejection inhibiting nozzle regions 310b.

[0095] As a result, dry edges, which are areas where no coating liquid is applied, are formed at positions facing the discharge suppression nozzle areas 310b on both ends (both edges) in the width direction of the base layer 101. In Fig. 7, the dry edges are indicated by the reference symbol 100a.

[0096] In the second example shown in FIG. 8, the width of the base layer 101 is wider than that of the example shown in FIG.

[0097] In the example shown in FIG. 8, the length of the five inkjet heads 310-1 to 310-5 arranged in series (the length of the inkjet head array 300) is approximately equal to the width of the coating layer region 100b of the base layer 101.

[0098] The coating control unit 400 uses all the inkjet heads 310 constituting the inkjet head array 300 as ejection nozzle areas 310a in the inkjet heads 310-1, 310-5 arranged at both ends of the inkjet head array 300 without providing ejection suppression nozzle areas 310b, and causes the coating liquid to be ejected onto the base layer 101.

[0099] As a result, a uniform coating layer 102 is formed on the surface of the base layer 101, and a coating layer region 100b is formed.

[0100] Furthermore, the coating liquid is not applied to the positions where no inkjet head 310 is present on both ends (both edges) of the base layer 101 in the width direction, thereby forming dry edges 100a.

[0101] In the third example shown in FIG. 9, the width of the base layer 101 is narrower than that in the example shown in FIG.

[0102] In the example shown in FIG. 9, the length of three inkjet heads 310-2 to 310-4, out of five inkjet heads 310-1 to 310-5, arranged in series is greater than the width of the coating layer region 100b of the base layer 101.

[0103] In addition, the inkjet heads 310-1 and 310-5 located at both ends of the inkjet head row 300 serve as the ejection suppression nozzle regions 310b. Furthermore, in the inkjet heads 310-2 and 310-4, the portions facing a predetermined range from the edge of the base layer 101 serve as the ejection suppression nozzle regions 310b.

[0104] The coating control unit 400 controls the inkjet heads 310-2 to 310-4 in the inkjet head row 300 to eject the coating liquid onto the base layer 101 from the ejection nozzle region 310a.

[0105] As a result, a uniform coating layer is formed on the surface of the base layer 101 at a position facing the discharge nozzle region 310a in the width direction thereof, forming a coating layer region 100b.

[0106] Furthermore, the coating control unit 400 controls the inkjet heads 310-1, 310-2, 310-4, and 310-5 in the inkjet head row 300 to suppress the ejection of the coating liquid from the ejection suppression nozzle region 310b.

[0107] As a result, dry edges 100a, which are areas where no coating liquid is applied, are formed at both ends (both edges) in the width direction of the base layer 101 at positions facing the discharge suppression nozzle areas 310b.

[0108] As described above, in the laminated film manufacturing system 1, the inkjet head array 300 has inkjet heads 310 arranged at positions facing at least the widthwise edges of the coating layer region 100b, i.e., the widthwise edges of the coating layer 102. By coating and forming both ends of the coating layer region 100b using inkjet nozzles, the edges (the boundaries between the coating layer region 100b and the dry edge 100a) can be formed precisely linearly, and the dry edge 100a can be formed with high accuracy.

[0109] For example, inkjet heads 310-1 and 310-5 in the first example shown in Figure 7, inkjet heads 310-1 and 310-5 in the second example shown in Figure 8, and inkjet heads 310-2 and 310-4 in the third example shown in Figure 9 correspond to inkjet heads 310 arranged at positions facing the widthwise edge of the coating layer area 100b (coating layer 102).

[0110] A dryer (not shown) may be provided downstream of the inkjet ejection device 30b. The dryer dries the second coating layer 102b (mixed liquid layer) formed on the surface of the base layer 101 by the inkjet ejection devices 30a and 30b. The dryer may dry the second coating layer 102b, for example, by blowing hot air onto the surface of the base layer 101 being transported in the vertical direction. The dryer performs a drying step of drying the second coating layer 102b.

[0111] Downstream of the dryer, the laminate film 100 may be processed, such as by cutting both edges of the laminate film 100, using a cutting device (not shown). Also, the thickness of the laminate film 100 may be measured using a measuring device (not shown). Thereafter, the laminate film 100 is wound up by a winder (not shown) and sent to the subsequent finishing process.

[0112] (B) Operation In the laminated film manufacturing system 1 configured as described above, the raw materials stored in the raw material silos 10a and 10b are fed into the granulator 11.

[0113] The granulator 11 generates pellets of a resin composition by adding inorganic fillers and optional additives to the thermoplastic resin as a raw material, as needed. The generated pellets are stored in a pellet silo 12.

[0114] The pellet silo 12 supplies the pellets stored therein to the extruder 13 .

[0115] The extruder 13 produces a base layer 101 (cast film layer). The base layer 101 produced by the extruder 13 is fed into a longitudinal stretching device .

[0116] The longitudinal stretching device 14 stretches in the longitudinal direction the base layer 101 extruded from the extruder 13. The base layer 101 (first stretched layer) stretched in the longitudinal direction by the longitudinal stretching device 14 is then fed into a transverse stretching device 16.

[0117] The transverse stretching device 16 stretches the base layer 101, which has been stretched in the longitudinal direction by the longitudinal stretching device 14, in the transverse direction (width direction).

[0118] The inkjet ejection device 30a ejects a first coating liquid onto the surface of the base layer 101 (substrate layer) to form a coating layer 102a with a uniform thickness. Then, before the coating layer 102a dries, the inkjet discharge device 30b discharges a second coating liquid onto the coating layer 102a to form a coating layer 102b with a uniform thickness. The coating layer 102b is a mixed liquid layer of the first coating liquid and the second coating liquid.

[0119] The coating layer 102b formed on the surface of the base layer 101 is dried by a dryer, thereby producing the laminated film 100. The laminated film 100 is then subjected to processing such as cutting both edges and measuring the thickness. The laminated film 100 is wound up by a winder (not shown) and sent to the subsequent finishing process.

[0120] (C) Effects Thus, according to the laminated film manufacturing system 1 as an example of an embodiment, the inkjet ejection devices 30a, 30b eject coating liquid onto the base layer 101 stretched in the transverse direction by the transverse stretching device 16, thereby forming coating layers 102a, 102b of uniform thickness on the front and back surfaces of the base layer 101.

[0121] After the inkjet discharge device 30a discharges a first coating liquid onto the surface of the base layer 101 (substrate layer) to form a coating layer 102a of uniform thickness, the inkjet discharge device 30b discharges a second coating liquid onto the coating layer 102a before the coating layer 102a dries to form a coating layer 102b of uniform thickness.

[0122] This allows two-liquid mixing of the first coating liquid and the second coating liquid to occur on the base layer 101, thereby achieving high performance.

[0123] Furthermore, the position where the two liquids are mixed can be controlled by the arrangement of the inkjet ejection device 30b.

[0124] For example, when gas is generated by mixing two liquids, the inkjet ejection device 30b can be disposed downstream from the inkjet ejection device 30a, thereby limiting the gas generation position to a downstream position in the line.

[0125] Furthermore, for example, if mixing two liquids requires a long time for hardening, the first inkjet ejection device 30a and the second inkjet ejection device 30b can be positioned as close to each other as possible upstream in the transport path of the base layer 101, thereby ensuring sufficient time for the coating layer 102b to dry (harden) during the transport process of the base layer 101.

[0126] The coating control unit 400 controls the inkjet head array 300 of the inkjet ejection device 30 to eject the coating liquid only from the nozzles included in the ejection nozzle region 310a provided opposite the coated layer region 100b of the base layer 101. The coating control unit 400 inhibits the ejection of the coating liquid from the nozzles included in the ejection inhibiting nozzle region 310b provided opposite the dry edge 100a of the base layer 101.

[0127] This allows the dry edges 100a to be easily formed at both widthwise ends (both edges) of the base layer 101, preventing the coating liquid from running to the back of the base layer 101. The coating liquid ejected from the nozzles of the inkjet head 310 is small in droplets, and the coating control unit 400 can precisely control the coating amount. This allows the edge of the coating layer region 100b (the boundary between the coating layer region 100b and the dry edge 100a) to be precisely linear, allowing the dry edge 100a to be formed with high accuracy. As a result, the coating liquid is prevented from running to the back of the base layer 101 at the edge.

[0128] For example, in the first example shown in Figure 7, the coating control unit 400 suppresses the ejection of coating liquid from the ejection suppression nozzle area 310b for the inkjet heads 310-1, 310-5 arranged opposite the widthwise edge portion of the base layer 101 in the inkjet head row 300 of the inkjet ejection device 30.

[0129] This makes it possible to easily form dry edges at both ends (both edges) of the base layer 101 in the width direction at positions opposite the discharge suppression nozzle region 310b, thereby preventing the coating liquid from running to the back of the base layer 101.

[0130] 8, the length of the inkjet head array 300 is set to be approximately equal to the width direction length of the coating layer region 100b of the base layer 101. The coating control unit 400 uses all of the inkjet heads 310 constituting the inkjet head array 300 as discharge nozzle regions 310a to discharge the coating liquid onto the base layer 101.

[0131] This also makes it possible to eject the coating liquid as tiny particles from an inkjet nozzle at both ends (both edges) of the coating layer region 100b in the width direction, thereby forming the edges of the coating layer region 100b in a precise straight line, easily forming a dry edge with high precision, and preventing the coating liquid from running to the back at both ends of the base layer 101.

[0132] 9, the coating control unit 400 controls the inkjet heads 310-2 to 310-4, which are provided opposite the coated layer region 100b of the base layer 101, to eject the coating liquid only from the nozzles included in the ejection nozzle region 310a. The coating control unit 400 inhibits the ejection of the coating liquid from the nozzles included in the ejection inhibiting nozzle region 310b of the inkjet heads 310-2 and 310-4, which are provided opposite the dry edge 100a of the base layer 101. The coating control unit 400 also inhibits the ejection of the coating liquid from the inkjet heads 310-1 and 310-5, which do not have an opposing base layer 101.

[0133] This also makes it possible to easily and precisely form dry edges at both ends (both edges) of the base layer 101 in the width direction at positions opposite the discharge suppression nozzle region 310b, thereby preventing the coating liquid from running to the back at both ends of the base layer 101.

[0134] In the inkjet head row 300, inkjet heads 310 are arranged at least at positions facing the widthwise edges of the coating layer region 100b (coating layer 102). For example, inkjet heads 310-1 and 310-5 in the first example shown in Fig. 7, inkjet heads 310-1 and 310-5 in the second example shown in Fig. 8, and inkjet heads 310-2 and 310-4 in the third example shown in Fig. 9 correspond to inkjet heads 310 arranged at positions facing the widthwise edges of the coating layer region 100b (coating layer 102).

[0135] Inkjet heads 310 are arranged at positions facing the widthwise edges of the coating layer region 100b (coating layer 102), and the coating liquid is ejected in particulate form from each nozzle in the ejection nozzle region 310a of these inkjet heads 310, thereby applying the coating liquid thinly and evenly to the surface of the base layer 101. The edges of the coating layer region 100b can be precisely formed linearly, and the dry edge 100a can be formed with high precision. As a result, the coating liquid is prevented from running back at both ends of the base layer 101.

[0136] (D) Other The disclosed technology is not limited to the above-described embodiment, and can be implemented in various modifications without departing from the spirit of the present embodiment.

[0137] For example, in the above-described embodiment, as illustrated in FIGS. 7 to 9, the inkjet head array 300 in the inkjet ejection device 30 is configured with a plurality of inkjet heads 310, but the present invention is not limited to this.

[0138] In the inkjet head array 300, inkjet heads 310 are arranged at positions facing the edges of the coating layer 102 in the width direction, and spray devices may be provided in place of the inkjet heads 310 at other positions.

[0139] That is, the inkjet head array 300 may be provided with spray nozzles between the inkjet nozzles provided at both ends.

[0140] 10 to 12 are diagrams showing modified examples of the inkjet ejection device 30 of the laminated film manufacturing system 1 as one example of the embodiment.

[0141] In the fourth example shown in Fig. 10, a plurality of spray devices 320 are provided instead of the inkjet heads 310-2 to 310-4 of the inkjet ejection device 30 of the first example shown in Fig. 7. In the figure, the same reference numerals as those already described indicate similar parts, and therefore, description thereof will be omitted.

[0142] The spray device 320 is a device that sprays the coating liquid, and sprays (ejects) the coating liquid in the form of a mist or the like from a spray nozzle (not shown) using gas such as high-pressure air or mechanical motion (such as a piezoelectric element).

[0143] The spray device 320 sprays the coating liquid under the control of the coating control unit 400.

[0144] The coating control unit 400 causes each spray device 320 to spray the coating liquid onto the base layer 101, and causes the inkjet heads 310-1 and 310-5 to eject the coating liquid onto the base layer 101 from the ejection nozzle area 310a.

[0145] A coating layer 102 is formed on the surface of the base layer 101 at a position facing each spray device 320 in the width direction of the base layer 101 .

[0146] In the example shown in Figure 10, each spray device 320 sprays the coating liquid onto an area other than the edge of the coating layer area 100b, so that the coating liquid sprayed from each spray device 320 onto the base layer 101 does not run back at both ends of the base layer 101.

[0147] Furthermore, the coating control unit 400 controls the inkjet heads 310-1 and 310-5 to eject the coating liquid from the ejection nozzle regions 310a onto the base layer 101, whereby the coating liquid is ejected in particulate form from each nozzle in the ejection nozzle region 310a of each inkjet head 310-1 and 310-5, and the coating liquid is evenly applied to the surface of the base layer 101. Furthermore, the edge of the coating layer region 100b can be precisely formed linearly, and the dry edge 100a can be formed with high accuracy.

[0148] Furthermore, the coating control unit 400 controls the inkjet heads 310-1 and 310-5 in the inkjet head row 300 to suppress the ejection of the coating liquid from the ejection suppression nozzle region 310b.

[0149] As a result, dry edges 100a, which are areas where no coating liquid is applied, are formed at both ends (both edges) in the width direction of the base layer 101 at positions facing the discharge suppression nozzle areas 310b.

[0150] 8. In the fifth example shown in FIG. 11, a plurality of spray devices 320 are provided instead of the inkjet heads 310-2 to 310-4 of the inkjet ejection device 30 of the second example shown in FIG.

[0151] The coating control unit 400 causes each spray device 320 to spray the coating liquid onto the base layer 101, and causes the inkjet heads 310-1 and 310-5 to eject the coating liquid onto the base layer 101 from the ejection nozzle area 310a.

[0152] A coating layer 102 is formed on the surface of the base layer 101 at a position facing each spray device 320 in the width direction of the base layer 101 .

[0153] In the example shown in Figure 11, each spray device 320 sprays the coating liquid onto areas other than the edge portions of the base layer 101, so the coating liquid sprayed onto the base layer 101 from each spray device 320 does not run behind at both ends of the base layer 101.

[0154] Furthermore, the coating control unit 400 controls the inkjet heads 310-1 and 310-5 to eject the coating liquid from the ejection nozzle regions 310a onto the base layer 101, whereby the coating liquid is ejected in particulate form from each nozzle in the ejection nozzle region 310a of each inkjet head 310-1 and 310-5, and the coating liquid is evenly applied to the surface of the base layer 101. Furthermore, the edge of the coating layer region 100b can be precisely formed linearly, and the dry edge 100a can be formed with high accuracy.

[0155] Furthermore, at positions on both ends (both edges) of the base layer 101 in the width direction where no inkjet head 310 is present, dry edges 100a are formed where no coating liquid is applied.

[0156] In the sixth example shown in FIG. 12, a plurality of spray devices 320 are provided instead of the inkjet head 310-3 of the inkjet ejection device 30 of the third example shown in FIG.

[0157] The coating control unit 400 causes each spray device 320 to spray the coating liquid onto the base layer 101, and causes the inkjet heads 310-2 and 310-4 to eject the coating liquid onto the base layer 101 from the ejection nozzle area 310a.

[0158] A coating layer 102 is formed on the surface of the base layer 101 at a position facing each spray device 320 in the width direction of the base layer 101 .

[0159] In the example shown in Figure 12, each spray device 320 sprays the coating liquid onto areas other than the edge portions of the base layer 101, so the coating liquid sprayed onto the base layer 101 from each spray device 320 does not run behind at both ends of the base layer 101.

[0160] Furthermore, the coating control unit 400 controls the inkjet heads 310-2 and 310-4 to eject the coating liquid from the ejection nozzle regions 310a onto the base layer 101, whereby the coating liquid is ejected in particulate form from each nozzle in the ejection nozzle region 310a of each inkjet head 310-2 and 310-4, and the coating liquid is evenly applied to the surface of the base layer 101. Furthermore, the edge of the coating layer region 100b can be precisely formed linearly, and the dry edge 100a can be formed with high accuracy.

[0161] Furthermore, the coating control unit 400 controls the inkjet heads 310-1, 310-2, 310-4, and 310-5 in the inkjet head row 300 to suppress the ejection of the coating liquid from the ejection suppression nozzle region 310b.

[0162] As a result, dry edges 100a, which are areas where no coating liquid is applied, are formed at both ends (both edges) in the width direction of the base layer 101 at positions facing the discharge suppression nozzle areas 310b.

[0163] The spray device 320 is cheaper than the inkjet head 310, so by providing the spray device 320 instead of the inkjet head 310 as described above, the manufacturing cost of the device can be reduced.

[0164] In the above-described embodiment, the coating layer 102 is formed on one surface (front surface) of the base layer 101, but the present invention is not limited to this. For example, a coating layer may also be formed on the back surface of the base layer 101.

[0165] FIG. 13 is a diagram schematically illustrating an example of the arrangement of inkjet ejection devices 30a and 30b in a modified example of the laminated film manufacturing system 1 as one example of the embodiment.

[0166] When forming a coating layer 102 on both sides of the base layer 101, as illustrated in Figure 13, inkjet ejection devices 30a-1 and 30b-1 are provided to form the coating layer 102 on the front surface (first surface) of the base layer 101, and inkjet ejection devices 30a-2 and 30b-2 are provided to form the coating layer 102 on the back surface (second surface) of the base layer 101.

[0167] These inkjet ejection devices 30a-1, 30b-1, 30a-2, and 30b-2 have the same configuration as the inkjet ejection device 30 described above. Note that the inkjet ejection device 30a-1 has a first nozzle row, the inkjet ejection device 30b-1 has a second nozzle row, the inkjet ejection device 30a-2 has a third nozzle row, and the inkjet ejection device 30b-2 has a fourth nozzle row.

[0168] In the first coating step, the inkjet discharge device 30a-1 discharges the first coating liquid from a first nozzle row onto a first surface (front surface) of the base layer 101 to form a coating layer 102a (first coating layer).

[0169] In the second coating process, the inkjet ejection device 30b-1 ejects a second coating liquid from the second nozzle row onto the surface of the coating layer 102a (first coating layer) formed on the first surface (front surface) of the base layer 101.

[0170] A coating layer 102b (mixed liquid layer) is formed on the first surface (front surface) of the base layer 101 by the inkjet ejection device 30a-1 and the inkjet ejection device 30b-1.

[0171] In the third coating process, the inkjet ejection device 30a-2 ejects a third coating liquid onto the second surface (back surface) of the base layer 101 from a third nozzle row arranged in the width direction of the base layer 101 at a third position facing the second surface (back surface) of the base layer 101 to form a coating layer 102a (third coating layer).

[0172] In the fourth coating process, the inkjet ejection device 30b-2 ejects a fourth coating liquid onto the coating layer 102a (third coating layer) from a fourth nozzle row arranged in the width direction of the base layer 101 at a fourth position downstream of the position of the inkjet ejection device 30a-2 (third position) and facing the second surface (back surface) of the base layer 101.

[0173] By using the inkjet discharge device 30a-2 and the inkjet discharge device 30b-2, a coating layer 102b (mixed liquid layer) is formed on the second surface (rear surface) of the base layer 101. The first to fourth coating liquids may have different compositions or may have the same composition, but they are not all the same.

[0174] 13, the inkjet discharge device 30b and the inkjet discharge device 30a are arranged side by side in the vertical direction. The conveyance path of the base layer 101 stretched by the transverse stretching device 16 is bent and folded back using a plurality of conveyance rollers 201, so that the inkjet discharge device 30a forms a coating layer 102 on the front surface (first surface) of the base layer 101, on the back surface (second surface) of which the inkjet discharge device 30b has formed a coating layer 102.

[0175] By arranging the inkjet ejection device 30b and the inkjet ejection device 30a side by side in the vertical direction in this manner, it is possible to achieve space saving in the laminated film manufacturing system 1.

[0176] In addition, in the inkjet ejection device 30b and the inkjet ejection device 30a as well, the inkjet head array 300 may be provided with spray nozzles between the inkjet nozzles provided at both ends.

[0177] The inkjet head 310 and the spray device 320 are both smaller than the application roller and have a high degree of freedom in installation, which allows the laminated film manufacturing system 1 to be space-saving.

[0178] A surface layer and a back layer may be further formed on the base layer 101 on which the coating layer 102 is formed. The base layer 101 may also be multi-layered.

[0179] In the above-described embodiment, the coating layer 102b (mixed liquid layer) is formed on one surface of the base layer 101 by two inkjet discharge devices 30a (30a-1, 30a-2) and 30b (30b-1, 30b-2) in the laminated film manufacturing system 1, but the present invention is not limited to this. Three or more inkjet discharge devices 30 may be used to form a mixed liquid layer on one surface of the base layer 101, and this can be implemented with appropriate modifications.

[0180] Furthermore, the above disclosure will enable those skilled in the art to implement and manufacture the present embodiment.

[0181] (E) Supplementary Note The following additional notes are provided regarding the above-described embodiments.

[0182] (Appendix 1) A method for producing a laminated film having a coating layer formed on a substrate layer, comprising: While conveying the base material layer, a first coating step of ejecting a first coating liquid onto the base material layer from a first nozzle row arranged in a width direction of the base material layer at a first position facing the base material layer to form a first coating layer; a second coating step of ejecting a second coating liquid onto the surface of the first coating layer from a second nozzle row arranged in the width direction of the base material layer at a second position downstream of the first position and facing the first coating layer; A method for producing a laminated film, comprising:

[0183] (Appendix 2) non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; a length in a width direction of at least one of the first nozzle row and the second nozzle row is approximately the same as a width of the coating layer; In the nozzle row having a length substantially equal to the width of the coating layer, at least the nozzles provided at both ends are inkjet nozzles. 2. A method for producing a laminated film according to claim 1.

[0184] (Appendix 3) non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; the length in the width direction of at least one of the first nozzle row and the second nozzle row is longer than the width of the coating layer; In a nozzle row having a length longer than the width of the coating layer, nozzles provided at positions facing both ends of the coating layer in the width direction and at positions facing the uncoated region are inkjet nozzles; At least one of the first coating step and the second coating step is and suppressing the ejection of the coating liquid from the inkjet nozzles provided in the nozzle row at positions corresponding to the non-coated regions. 2. A method for producing a laminated film according to claim 1.

[0185] (Appendix 4) The first nozzle row and the second nozzle row are disposed at a distance equal to or greater than a threshold on the transport path of the base material layer. 4. A method for producing a laminated film according to any one of claims 1 to 3.

[0186] (Appendix 5) After the first coating step, the second coating step is carried out before the first coating layer dries. 5. A method for producing a laminated film according to any one of claims 1 to 4.

[0187] (Appendix 6) In the first coating step, the first coating liquid is ejected from the first nozzle row onto a first surface of the base material layer to form the first coating layer; In the second coating step, the second coating liquid is ejected from the second nozzle row onto the first surface of the first coating layer; moreover, a third coating step of ejecting a third coating liquid onto the second surface of the base material layer from a third nozzle row arranged in a width direction of the base material layer at a third position facing the second surface of the base material layer to form a third coating layer; At a fourth position downstream of the third position and facing the second surface of the base material layer, a fourth nozzle row arranged in a width direction of the base material layer emits a jet of ink onto the third coating layer. a fourth coating step of discharging a fourth coating liquid; 6. A method for producing a laminated film according to any one of claims 1 to 5, comprising:

[0188] (Appendix 7) A manufacturing apparatus for manufacturing a laminated film having a coating layer formed on a substrate layer, comprising: a conveying device that conveys the base material layer; a first coating unit that forms a first coating layer by ejecting a first coating liquid onto the base material layer from a first nozzle row that is arranged in a width direction of the base material layer at a first position facing the base material layer; and a second coating unit that ejects a second coating liquid onto the surface of the first coating layer from a second nozzle row that is arranged in the width direction of the base material layer at a second position that is downstream of the first position and faces the first coating layer; A laminated film manufacturing apparatus comprising:

[0189] (Appendix 8) non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; a length in a width direction of at least one of the first nozzle row and the second nozzle row is approximately the same as a width of the coating layer; In the nozzle row having a length substantially equal to the width of the coating layer, at least the nozzles provided at both ends are inkjet nozzles. 8. The laminated film manufacturing apparatus according to claim 7,

[0190] (Appendix 9) non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; the length in the width direction of at least one of the first nozzle row and the second nozzle row is longer than the width of the coating layer; In a nozzle row having a length longer than the width of the coating layer, nozzles provided at positions facing both ends of the coating layer in the width direction and at positions facing the uncoated region are inkjet nozzles; At least one of the first coating unit and the second coating unit, In the nozzle row, the inkjet nozzles provided at positions corresponding to the non-coated regions are prevented from ejecting the coating liquid. 8. The laminated film manufacturing apparatus according to claim 7,

[0191] (Appendix 10) The first nozzle row and the second nozzle row are disposed at a distance equal to or greater than a threshold on the transport path of the base material layer. 10. The laminated film manufacturing apparatus according to any one of appendices 7 to 9, characterized in that:

[0192] (Appendix 11) After the first coating unit forms the first coating layer, the second coating unit ejects the second coating liquid onto the surface of the first coating layer before the first coating layer dries. 11. The laminated film manufacturing apparatus according to any one of claims 7 to 10,

[0193] (Appendix 12) In the first coating unit, the first coating liquid is ejected from the first nozzle row onto a first surface of the base material layer to form the first coating layer; In the second coating section, the second coating liquid is ejected from the second nozzle row onto the first surface of the first coating layer; moreover, a third coating unit that discharges a third coating liquid onto the second surface of the base material layer from a third nozzle row arranged in the width direction of the base material layer at a third position facing the second surface of the base material layer to form a third coating layer; and a fourth coating unit that ejects a fourth coating solution onto the surface of the third coating layer from a fourth nozzle row that is arranged in a width direction of the base material layer at a fourth position that is downstream of the third position and faces the second surface of the base material layer; and 12. The laminated film manufacturing apparatus according to any one of claims 7 to 11, comprising: [Explanation of symbols]

[0194] 1. Laminated film manufacturing system 10a, 10b Raw material silo 11 Granulator 12 Pellet silo 13 Extruder 14 Longitudinal stretching device 141a, 141b, 141c, 141d, 141 conveying rollers 16 Lateral stretching device 18 Hair dryer 30a, 30a-1, 30a-2, 30b, 30b-1, 30b-2, 30 Inkjet ejection device 100 Laminated Film 100a Dry Edge 100b Coating layer area 101 Base layer 102a, 102 coating layer (first coating layer) 102b, 102 coating layer (second coating layer) 161 clips 201 Conveyor roller 300 inkjet head rows 310-1~310-5,310 Inkjet Head 310a Discharge nozzle area 310b Discharge suppression nozzle area 320 Spray Equipment 400 Coating control unit

Claims

1. A method for producing a laminated film having a coating layer formed on a substrate layer, comprising: While conveying the base material layer, a first coating step of ejecting a first coating liquid onto the base material layer from a first nozzle row arranged in a width direction of the base material layer at a first position facing the base material layer to form a first coating layer; a second coating step of ejecting a second coating liquid onto the surface of the first coating layer from a second nozzle row arranged in the width direction of the base material layer at a second position downstream of the first position and facing the first coating layer, thereby forming a coating layer of a two-liquid mixed liquid obtained by mixing the first coating liquid and the second coating liquid; Equipped with The components contained in the first coating liquid and the components contained in the second coating liquid are mutually reactive. A method for producing a laminated film, comprising:

2. A method for producing a laminated film having a coating layer formed on a substrate layer, comprising: While conveying the base material layer, a first coating step of ejecting a first coating liquid onto the base material layer from a first nozzle row arranged in a width direction of the base material layer at a first position facing the base material layer to form a first coating layer; a second coating step of ejecting a second coating liquid onto the surface of the first coating layer from a second nozzle row arranged in a width direction of the base material layer at a second position downstream of the first position and facing the first coating layer; Equipped with non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; the length in the width direction of at least one of the first nozzle row and the second nozzle row is longer than the width of the coating layer; In a nozzle row having a length longer than the width of the coating layer, nozzles provided at positions facing both ends of the coating layer in the width direction and at positions facing the uncoated region are inkjet nozzles; At least one of the first coating step and the second coating step is and suppressing the ejection of the coating liquid from the inkjet nozzles provided in the nozzle row at positions corresponding to the non-coated regions. A method for producing a laminated film, comprising:

3. A method for producing a laminated film in which a coating layer is formed on a substrate layer, comprising: While conveying the base material layer, a first coating step of ejecting a first coating liquid onto the base material layer from a first nozzle row arranged in a width direction of the base material layer at a first position facing the base material layer to form a first coating layer; a second coating step of ejecting a second coating liquid onto the surface of the first coating layer from a second nozzle row arranged in a width direction of the base material layer at a second position downstream of the first position and facing the first coating layer; Equipped with In the first coating step, the first coating liquid is ejected from the first nozzle row onto a first surface of the base material layer to form the first coating layer; In the second coating step, the second coating liquid is ejected from the second nozzle row onto the first surface of the first coating layer; moreover, a third coating step of ejecting a third coating liquid onto the second surface of the base material layer from a third nozzle row arranged in a width direction of the base material layer at a third position facing the second surface of the base material layer to form a third coating layer; a fourth coating step of ejecting a fourth coating liquid onto the third coating layer from a fourth nozzle row arranged in a width direction of the base material layer at a fourth position downstream of the third position and facing the second surface of the base material layer. A method for producing a laminated film, comprising:

4. non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; a length in a width direction of at least one of the first nozzle row and the second nozzle row is substantially the same as a width of the coating layer; In the nozzle row having a length substantially equal to the width of the coating layer, at least the nozzles provided at both ends are inkjet nozzles. The method for producing the laminated film according to any one of claims 1 to 3.

5. non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; the length in the width direction of at least one of the first nozzle row and the second nozzle row is longer than the width of the coating layer; In a nozzle row having a length longer than the width of the coating layer, nozzles provided at positions facing both ends of the coating layer in the width direction and at positions facing the uncoated region are inkjet nozzles; At least one of the first coating step and the second coating step is and suppressing the ejection of the coating liquid from the inkjet nozzles provided in the nozzle row at positions corresponding to the non-coated regions. The method for producing a laminated film according to claim 1 or 3,

6. In the first coating step, the first coating liquid is ejected from the first nozzle row onto a first surface of the base material layer to form the first coating layer; In the second coating step, the second coating liquid is ejected from the second nozzle row onto the first surface of the first coating layer; moreover, a third coating step of ejecting a third coating liquid onto the second surface of the base material layer from a third nozzle row arranged in a width direction of the base material layer at a third position facing the second surface of the base material layer to form a third coating layer; a fourth coating step of ejecting a fourth coating solution onto the third coating layer from a fourth nozzle row arranged in a width direction of the base material layer at a fourth position downstream of the third position and facing the second surface of the base material layer; The method for producing a laminated film according to claim 1, further comprising:

7. A manufacturing apparatus for manufacturing a laminated film having a coating layer formed on a substrate layer, comprising: a conveying device that conveys the base material layer; a first coating unit that forms a first coating layer by ejecting a first coating liquid onto the base material layer from a first nozzle row that is arranged in a width direction of the base material layer at a first position facing the base material layer; and a second coating section that, at a second position downstream of the first position and facing the first coating layer, ejects a second coating liquid onto the surface of the first coating layer from a second nozzle row arranged in the width direction of the base material layer, thereby forming a coating layer of a two-liquid mixed liquid obtained by mixing the first coating liquid and the second coating liquid; Equipped with The components contained in the first coating liquid and the components contained in the second coating liquid are mutually reactive. A laminated film manufacturing apparatus characterized by:

8. A manufacturing apparatus for manufacturing a laminated film having a coating layer formed on a substrate layer, comprising: a conveying device that conveys the base material layer; a first coating unit that forms a first coating layer by ejecting a first coating liquid onto the base material layer from a first nozzle row that is arranged in a width direction of the base material layer at a first position facing the base material layer; and a second coating unit that ejects a second coating liquid onto the surface of the first coating layer from a second nozzle row that is arranged in the width direction of the base material layer at a second position that is downstream of the first position and faces the first coating layer; Equipped with non-coated regions in which the coating layer is not formed are defined along both ends in the width direction of the base layer; the length in the width direction of at least one of the first nozzle row and the second nozzle row is longer than the width of the coating layer; In a nozzle row having a length longer than the width of the coating layer, nozzles provided at positions facing both ends of the coating layer in the width direction and at positions facing the uncoated region are inkjet nozzles; At least one of the first coating unit and the second coating unit, In the nozzle row, the inkjet nozzles provided at positions corresponding to the non-coated regions are prevented from ejecting the coating liquid. A laminated film manufacturing apparatus characterized by:

9. A manufacturing apparatus for manufacturing a laminated film having a coating layer formed on a substrate layer, comprising: a conveying device that conveys the base material layer; a first coating unit that forms a first coating layer by ejecting a first coating liquid onto the base material layer from a first nozzle row that is arranged in a width direction of the base material layer at a first position facing the base material layer; and a second coating unit that ejects a second coating liquid onto the surface of the first coating layer from a second nozzle row that is arranged in the width direction of the base material layer at a second position that is downstream of the first position and faces the first coating layer; Equipped with In the first coating section, the first coating liquid is ejected from the first nozzle row onto a first surface of the base material layer to form the first coating layer; In the second coating section, the second coating liquid is ejected from the second nozzle row onto the first surface of the first coating layer; moreover, a third coating unit that ejects a third coating liquid onto the second surface of the base material layer from a third nozzle row arranged in the width direction of the base material layer at a third position facing the second surface of the base material layer to form a third coating layer; and a fourth coating unit that ejects a fourth coating solution onto the surface of the third coating layer from a fourth nozzle row that is arranged in a width direction of the base material layer at a fourth position that is downstream of the third position and faces the second surface of the base material layer; and Equipped with A laminated film manufacturing apparatus characterized by:

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