Manufacturing method of laminated film

Abstract

To provide a method for efficiently manufacturing a laminated film having a patterned layer made of various functional materials as an intermediate layer.SOLUTION: A method for manufacturing a laminated film 100 having a base layer 101, a patterned layer 102 and a surface layer 103, comprises: a patterned layer forming step of forming the patterned layer 102 of a functional material on the base layer 101 by using an inkjet ejection device 20; and a surface layer forming step of forming a surface layer on a surface of the patterned layer 102 by an extrusion lamination method by using a surface layer forming material made of a thermoplastic resin composition.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a manufacturing technique for laminated films.

Background Art

[0002] As a method for creating a laminated film, a method of providing a surface layer on a base material layer by an extrusion lamination method is known. In that case, before providing the surface layer, by forming a pattern layer on the surface of the base material layer, anti-counterfeiting performance can be imparted or functionality can be imparted.

[0003] Also, the formation of the pattern layer on the surface of the base material layer is performed, for example, by printing a pattern or a design on the surface of the base material layer by a gravure printing or flexographic printing method.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in gravure printing and flexographic printing, when changing a pattern or a design, the printing apparatus must be stopped, resulting in product loss. Also, it is difficult to enhance anti-counterfeiting properties by sandwiching variable information.

[0006] Also, gravure printing and flexographic printing apparatuses are large, and it may be difficult to incorporate them into a laminated film manufacturing line.

[0007] One object of the present invention is to enable efficient production of a laminated film having a pattern layer made of various functional materials as an intermediate layer.

Means for Solving the Problems

[0008] Therefore, the method for manufacturing this laminated film is a method for manufacturing a laminated film having a base layer, a pattern layer, and a surface layer, comprising: a pattern layer formation step of forming a pattern layer on the base layer with a functional material using an inkjet ejection device; and a surface layer formation step of forming a surface layer on the surface of the pattern layer by an extrusion lamination method using a surface layer forming material made of a thermoplastic resin composition. [Effects of the Invention]

[0009] According to one embodiment, a laminated film having a patterned layer made of various functional materials as an intermediate layer can be efficiently manufactured. [Brief explanation of the drawing]

[0010] [Figure 1] This figure illustrates the configuration of a laminated film manufacturing system as an example of an embodiment. [Figure 2] This figure schematically shows an example of the configuration of a longitudinal stretching apparatus for a laminated film manufacturing system, as an example of an embodiment. [Figure 3] This is a diagram illustrating an inkjet ejection device for a laminated film manufacturing system as an example of an embodiment. [Figure 4] This diagram schematically shows an example of the configuration of a transverse stretching apparatus for a laminated film manufacturing system, as an example of an embodiment. [Figure 5] This diagram schematically shows an example of the arrangement of an inkjet ejector in a modified example of a laminated film manufacturing system. [Modes for carrying out the invention]

[0011] The following describes embodiments of the method for manufacturing this laminated film with reference to the drawings. However, the embodiments shown below are merely illustrative, and there is no intention to exclude various modifications or applications of techniques not explicitly shown in the embodiments. In other words, these embodiments can be implemented in various ways (such as by combining embodiments and their respective modifications) without departing from their spirit. Furthermore, each figure is not intended to represent only the components shown in the figure, but may include other functions, etc.

[0012] (A) Configuration Figure 1 is a diagram illustrating the configuration of a laminated film manufacturing system 1 as an example of an embodiment.

[0013] 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 pattern layer 102 is formed on a base layer 101.

[0014] The following example shows how to produce a laminated film 100 in which a surface layer 103 is formed on top of a pattern layer 102, and a back layer 104 is formed below a base layer 101. At least one of the surface layer 103 and the back layer 104 may be called the surface layer of the laminated film 100.

[0015] The base layer 101 represents a "cast film layer formed by extruding a resin composition" (hereinafter sometimes simply referred to as the "cast film layer") until the first stretching process is completed, represents the "first stretched layer" after the first stretching process until the second stretching process is completed, and represents a "porous substrate layer" after the second stretching process is completed.

[0016] Examples of materials for forming the base layer 101 include resin compositions containing thermoplastic resins. Specifically, the cast film layer, the first stretched layer, and the porous substrate layer corresponding to the base layer 101 are all made of resin compositions containing thermoplastic resins.

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

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

[0019] The resin composition may further contain a filler. In particular, when the base material layer is a porous layer as described later, it is preferable that the resin composition contains a filler. The filler may be either an inorganic filler or an organic filler. The filler may be an inorganic filler or an organic filler, and in either case, those having an average particle size of usually 0.01 μm to 15 μm, preferably 0.01 μm to 8 μm, and more preferably 0.03 μm to 4 μm can be used. The average particle size of the filler is the average primary particle size (D50), which is the volume average particle size measured by a particle size distribution meter using laser diffraction. From the viewpoint of obtaining a desired porosity, the content of the filler in the base layer 101 is preferably 1% by mass or more, more preferably 3% by mass or more, still more preferably 5% by mass or more, and preferably 45% by mass or less, more preferably 40% by mass or less, and still more preferably 35% by mass or less.

[0020] Specific examples of the inorganic filler include calcium carbonate, calcined clay, silica, diatomaceous earth, talc, titanium oxide, barium sulfate, alumina, and the like.

[0021] As the organic filler, 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 are preferred. For example, when the thermoplastic resin is an olefin-based polymer, as the organic filler, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon-6, nylon-6,6, a homopolymer of cyclic olefin or a copolymer of cyclic olefin and ethylene, etc. having a melting point of 120°C to 300°C or a glass transition temperature of 120°C to 280°C is preferably used.

[0022] If necessary, a stabilizer, a light stabilizer, a dispersant, a lubricant, a fluorescent whitening agent, a colorant, etc. may be further added to the resin composition.

[0023] The base layer 101 may have a single-layer structure or a multi-layer structure of two or more layers.

[0024] Both the surface layer 103 and the back surface layer 104 are made of a resin composition containing a thermoplastic resin. Further, the resin composition may contain a filler. In particular, when the surface layer or the back surface layer is a porous layer as described later, it is preferable that the resin composition contains a filler. The filler may be either an inorganic filler or an organic filler. The same thermoplastic resin, inorganic filler, and organic filler used for the base layer 101 can be used for the surface layer 103 and the back surface layer 104. Furthermore, the above stabilizer, light stabilizer, dispersant, lubricant, fluorescent whitening agent, colorant, etc. may be added to the surface layer 103 and the back surface layer 104.

[0025] The surface layer 103 and the back surface layer 104 may each have a single-layer structure or a multi-layer structure of two or more layers. Further, at least a part of the layers constituting the surface layer 103 and the back surface layer 104 may be stretched in a uniaxial direction.

[0026] The laminated film manufacturing system 1 illustrated in Figure 1 comprises raw material silos 10a, 10b, a granulator 11, pellet silos 12a, 12b, 12c, extruders 13a, 13b, 13c, a longitudinal stretching device 14, a laminating device 15, a transverse stretching device 16, and an inkjet ejector 20.

[0027] Each of the raw material silos 10a, 10b, granulator 11, pellet silos 12a, 12b, 12c, extruders 13a, 13b, 13c, longitudinal stretching device 14, laminating device 15, transverse stretching device 16, and inkjet ejector device 20, which constitute the laminated film manufacturing system 1, realizes a manufacturing process for producing laminated film 100.

[0028] Raw material silos 10a and 10b store the raw materials for the laminated film 100. These raw materials include, for example, thermoplastic resin, fillers, and optional additives. Although Figure 1 shows two raw material silos, any number required can be provided.

[0029] The raw materials for the laminated film 100 may include recycled materials produced by processing scraps generated during the cutting process or other steps in the molding of the laminated film 100.

[0030] The raw materials stored in the raw material silos 10a and 10b are fed into the granulator 11.

[0031] The granulator 11 adds fillers and, if necessary, various additives to the thermoplastic resin raw material to produce pellets of the resin composition.

[0032] Pellet silos 12a, 12b, and 12c each store pellets produced by the granulator 11. Pellet silo 12a supplies the pellets it stores to the extruder 13a. Pellet silo 12b supplies the pellets it stores to the extruder 13b. Pellet silo 12c supplies the pellets it stores to the extruder 13c.

[0033] Extruders 13a, 13b, and 13c each extrude molten thermoplastic resin in sheet form from extruder dies (not shown).

[0034] The extruder 13a produces the surface layer 103 of the laminated film, and extrudes molten thermoplastic resin in sheet form from an extruder die (not shown). The surface layer 103 extruded from the extruder 13a is supplied to the laminating device 15, which will be described later.

[0035] The extruder 13c produces the back layer 104 of the laminated film, and extrudes molten thermoplastic resin in sheet form from an extruder die (not shown). The back layer 104 extruded from the extruder 13c is supplied to the laminating device 15.

[0036] The extruder 13b forms the base layer 101, which is the cast film layer, and extrudes the molten resin composition in sheet form from an extruder die (not shown). The base layer 101, i.e., the cast film layer, extruded from the extruder 13b is conveyed by a conveyor roller (not shown) and supplied to a longitudinal stretching device 14, which will be described later.

[0037] The longitudinal stretching device 14 is positioned downstream of the base layer 101, i.e., the cast film layer, which is extruded from the extruder 13b, in the flow direction (conveying direction).

[0038] The longitudinal stretching device 14 stretches the base layer 101, i.e., the cast film layer, extruded from the extruder 13b, in the flow direction of the base layer 101. Hereinafter, the flow direction (conveying direction) of the base layer 101 may be referred to as the longitudinal direction. The longitudinal direction corresponds to the first direction.

[0039] The longitudinal stretching apparatus 14 corresponds to a first stretching apparatus that stretches the base layer 101 (cast film layer) in the longitudinal direction (first direction). The longitudinal stretching apparatus 14 also realizes a first stretching process that stretches the base layer 101 (cast film layer) in the longitudinal direction (first direction).

[0040] In the longitudinal stretching device 14, for example, multiple (three in the example shown in Figure 1) conveyor rollers are arranged parallel to each other in a direction perpendicular to the longitudinal stretching direction. Then, by, for example, creating a difference in the peripheral speed of the conveyor rollers between these conveyor rollers, longitudinal tension is applied to the cast film layer, and the layer is stretched in the longitudinal direction. In other words, the longitudinal stretching device 14 may perform inter-roll stretching using the difference in peripheral speed of the roll group.

[0041] When stretching is performed, the stretching temperature is preferably in the range of above the glass transition temperature of the thermoplastic resin if the thermoplastic resin used is amorphous. If the thermoplastic resin is crystalline, the stretching temperature is preferably in the range of above the glass transition temperature of the amorphous portion of the thermoplastic resin and below the melting point of the crystalline portion of the thermoplastic resin, and preferably 2°C to 60°C lower than the melting point of the thermoplastic resin. Specifically, for propylene homopolymer (melting point 155°C to 167°C), a stretching temperature of 100°C to 164°C is preferred, and for high-density polyethylene resin (melting point 121°C to 134°C), a stretching temperature of 70°C to 133°C is preferred.

[0042] The stretching speed is not particularly limited, but from the viewpoint of stable stretch molding, it is preferable to be in the range of 20 m / min to 350 m / min.

[0043] Furthermore, the stretching ratio can be appropriately determined considering the characteristics of the thermoplastic resin used. For example, when biaxial stretching is performed using a propylene-based resin, the stretching ratio is an area stretching ratio, with a lower limit of usually 1.5 times or more, preferably 4 times or more, and an upper limit of usually 60 times or less, preferably 50 times or less.

[0044] Figure 2 is a schematic diagram showing an example of the configuration of a longitudinal stretching device 14 of a laminated film manufacturing system 1 as an example of an embodiment.

[0045] In the example shown in Figure 2, the four conveyor rollers 141a, 141b, 141c, and 141d are arranged so that their rotation axes are parallel to each other, with each rotation axis perpendicular to the vertical direction. The four conveyor rollers 141a, 141b, 141c, and 141d are arranged in the order of conveyor roller 141a, conveyor roller 141b, conveyor roller 141c, and conveyor roller 141d along the flow direction of the base layer 101. Hereafter, unless otherwise distinguished, the conveyor rollers 141a, 141b, 141c, and 141d will be referred to as conveyor roller 141.

[0046] Each of these transport rollers 141 is configured to rotate around a rotation axis by a drive motor (not shown), and each rotates in a direction along the flow of the base layer 101 while in contact with the base layer 101.

[0047] Furthermore, the rotational speed of the drive motor is controlled so that the peripheral speed of each conveying roller 141 increases as it is positioned downstream in the flow direction of the base layer 101. As a result, tension is generated in the base layer 101 along the flow direction of the base layer 101 between adjacent conveying rollers 141, causing the base layer 101 to stretch in the longitudinal direction.

[0048] An inkjet ejection device 20 is provided downstream of the longitudinal stretching device 14 and upstream of the transverse stretching device 16.

[0049] The inkjet ejector 20 ejects a coating liquid onto the surface of the base layer 101 stretched by the longitudinal stretching device 14, thereby forming a pattern layer 102 on the surface of the base layer 101. The base layer 101 stretched by the longitudinal stretching device 14 corresponds to the first stretched layer.

[0050] The inkjet ejector 20 ejects coating liquid particles onto the first surface (front) of the base layer 101. Alternatively, the inkjet ejector 20 may eject coating liquid particles onto the second surface (back) of the base layer 101.

[0051] The inkjet ejector 20 realizes a coating process in which a pattern layer 102 is formed on the base layer (first stretched layer) 101 obtained in the longitudinal stretching device 14 (first stretching process).

[0052] Figure 3 is a diagram illustrating an inkjet ejector 20 of a laminated film manufacturing system 1 as an example of an embodiment.

[0053] The inkjet ejector 20 is positioned facing the surface of the base layer 101 and is arranged along the width direction. Multiple ink nozzles (not shown) are arranged in the inkjet ejector 20 facing the base layer 101. These ink nozzles are formed over the entire width of the base layer 101, and coating liquid is ejected in particulate form from each ink nozzle, applying the coating liquid to the surface of the base layer 101.

[0054] The discharge of coating liquid from each ink nozzle of the inkjet ejector 30 is controlled by the coating control unit 400 (see Figure 3). The coating control unit 400 controls the discharge of coating liquid from each ink nozzle. For example, the coating control unit 400 can precisely control the amount of coating liquid discharged by switching the discharge on / off for each ink nozzle.

[0055] The coating control unit 400 functions through the execution of driver software by a computer processor (not shown).

[0056] The coating control unit 400 can control the on / off status of ejection for any of the multiple ink ejection ports provided in the inkjet ejection device 20, thereby enabling control of the ejection of coating liquid from specific ink ejection ports in the inkjet ejection device 30, or suppression of ejection from ink ejection ports. The driver software that controls the ejection of the inkjet ejection device 20 is known, and a detailed explanation thereof is omitted.

[0057] The coating control unit 400 forms (prints) a pattern on the surface of the base layer 101 using a coating liquid. The coating liquid may be a functional material that gives the laminated film some kind of function.

[0058] There are no particular restrictions on the functional material, but it may be any coating liquid containing, for example, a fluorescent ink, a release agent, a gas barrier agent, an ethyleneimine compound, a conductive material, or an aromatic oil capsule. The coating control unit 400 may change the pattern formed on the surface of the base layer 101 depending on the type of coating liquid (functional material). That is, the coating control unit 400 may form a pattern layer 102 on the surface of the base layer 101 according to the type of coating liquid.

[0059] A fluorescent ink may be used as the coating solution to print a design onto the surface of the base layer 101 using an inkjet ejection device 20. This makes it difficult to counterfeit the laminated film 100, as the design becomes visible when exposed to black light. In other words, using a fluorescent ink as the coating solution allows for the creation of a highly anti-counterfeiting film. In this case, it is desirable that the surface layer 103 be transparent or semi-transparent.

[0060] Alternatively, a design may be printed on the surface of the base layer 101 using an inkjet ejection device 20 with a coating solution containing a release agent. This allows a label, for example, in which at least one surface of the surface layer or back layer is adhesive-treated, to be peeled off after being attached to an article, causing the release agent portion to peel off and the design to stand out.

[0061] Alternatively, a coating solution containing a gas barrier agent may be used. This makes it easy to impart gas barrier properties to the laminated film 100.

[0062] Furthermore, a coating solution containing an ethyleneimine compound may be used. This can improve the interlayer strength of the laminated film.

[0063] Alternatively, a coating solution containing a conductive material may be used. This makes it possible to easily produce a conductive laminated film 100 (conductive film).

[0064] Alternatively, a coating solution containing capsules encapsulating aromatic oils (aromatic oil capsules) may be used. This allows for the easy production of a fragrance-retaining film.

[0065] Furthermore, a coating solution containing a resin and a colorant that changes color or color upon laser irradiation may be used. In this case, a pattern in which the coating solution is applied solidly only to the area to be laser-marked may be adopted. This makes it easy to obtain a laminated film 100 that can record variable information, etc., by laser marking. Furthermore, when performing laser marking on the pattern layer 102, it is desirable that the surface layer 103 be transparent or semi-transparent.

[0066] Furthermore, a coating solution containing an insecticide or antibacterial agent may be used. This makes it possible to easily produce a laminated film 100 with insecticidal or antibacterial effects. In this case, it is desirable that the base layer 101 or the surface layer 103 is a stretched resin film, and that it is a porous film (porous layer) formed by stretching a resin composition containing a thermoplastic resin and a filler to form voids in the film.

[0067] The various coating solutions described above contain, in addition to release agents, gas barrier agents, ethyleneimine compounds, conductive materials, aromatic oil capsules, insecticides, or antibacterial agents, at least a dispersion medium capable of dissolving or dispersing these in minute amounts.

[0068] Furthermore, the patterns that make up the pattern layer 102 may be geometric or regular patterns, irregular patterns, or any kind of design, letters, or numbers; there are no particular restrictions.

[0069] The laminating device 15 is located downstream of the extruders 13b and 13c and the inkjet ejector 20.

[0070] The laminating apparatus 15 generates a laminate 105 by layering a surface layer 103 extruded from the extruder 13a and a back layer 104 extruded from the extruder 13c onto a base layer 101 which has been extruded from the extruder 13b, stretched in the longitudinal direction by the longitudinal stretching apparatus 14, and onto which a pattern layer 102 has been formed by the inkjet ejection apparatus 20. The laminating apparatus 15 forms the laminate 105 by the extrusion lamination method.

[0071] The laminating apparatus 15 corresponds to a surface layer forming apparatus that forms a surface layer on the surface of the pattern layer 102 by an extrusion lamination method using a surface layer forming material made of a thermoplastic resin composition. Furthermore, the laminating apparatus 15 realizes a surface layer forming process that forms a surface layer on the surface of the pattern layer 102 by an extrusion lamination method using a surface layer forming material made of a thermoplastic resin composition.

[0072] The bonding of the surface layer 103 and back layer 104 to the base layer 101 by the laminating device 15 can be achieved using known methods, and their explanation will be omitted.

[0073] The transverse stretching device 16 is located downstream of the laminating device 15.

[0074] The transverse stretching apparatus 16 stretches the laminate 105 produced by the laminating apparatus 15 in a direction perpendicular to the longitudinal direction (transverse direction, width direction) to form a laminated film 100. In order to make at least one of the base layer 101 or the surface layer 103 a porous layer, if the resin composition for forming the layer contains a filler, voids are formed in the layer by this transverse stretching, and a porous layer is formed. The transverse direction corresponds to the second direction.

[0075] The transverse stretching apparatus 16 corresponds to a second stretching apparatus that stretches the laminate 105 produced by the laminating apparatus 15 in a transverse direction (width direction, second direction) perpendicular to the longitudinal direction (first direction). Furthermore, the transverse stretching apparatus 16 realizes a second stretching process that stretches the base layer 101 (first stretched layer) on which the pattern layer 102 is formed in a transverse direction (width direction, second direction) perpendicular to the longitudinal direction (first direction).

[0076] In the second stretching step, similar to the first stretching step, the base layer 101 is heated to a stretching temperature corresponding to the type of thermoplastic resin used, and then stretched.

[0077] Figure 4 is a schematic diagram showing an example of the configuration of a transverse stretching device 16 of a laminated film manufacturing system 1 as an example of an embodiment.

[0078] The transverse stretching device 16 is equipped with a plurality of clips 161 (six in the example shown in Figure 4) for gripping the edges of the laminate 105. These clips 161 are arranged in pairs at positions opposite each other across the laminate 105 on each of the two edges of the laminate 105. In the example shown in Figure 4, three pairs of clips 161 are provided along the flow direction of the laminate 105.

[0079] In these multiple clips 161, pairs of clips 161 positioned opposite each other across the laminate 105 grip the edges of the laminate 105 and move away from each other, thereby pulling and stretching the laminate 105 in the lateral direction (width direction).

[0080] The clips 161 that grip the laminate 105 move in the flow direction, following the transport of the laminate 105, stretching the laminate 105 in the width direction, and releasing the laminate 105 at a predetermined position. After that, each clip 161 returns to its upstream position in the transport direction of the laminate 105 and grips the laminate 105 again. In this way, the lateral stretching device 16 stretches the laminate 105 laterally by repeatedly gripping, stretching, and releasing the laminate 105 using multiple clips 161. That is, the lateral stretching device 16 performs clip stretching using a tenter oven. The laminated film 100 of the present invention is completed after this lateral stretching process, i.e., the second stretching process.

[0081] Subsequently, the laminated film 100 is subjected to processing such as trimming of both edges and measurement of its thickness. After that, the laminated film 100 is wound up by a winder (not shown) and sent to the subsequent finishing process.

[0082] (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.

[0083] The granulator 11 adds fillers and optional additives to the raw thermoplastic resin to produce pellets of the resin composition. The produced pellets are stored in pellet silos 12a, 12b, and 12c.

[0084] Pellet silo 12a supplies the pellets it stores to extruder 13a. Pellet silo 12b supplies the pellets it stores to extruder 13b. Pellet silo 12c supplies the pellets it stores to extruder 13c.

[0085] The extruder 13b generates the base layer 101 (cast film layer). The base layer 101 generated by the extruder 13a is fed into the longitudinal stretching device 14.

[0086] The longitudinal stretching device 14 stretches the base layer 101 extruded from the extruder 13b in the longitudinal direction. The inkjet ejector 20 ejects coating liquid particles onto the first surface of the base layer 101 (first stretched layer) stretched in the longitudinal direction by the longitudinal stretching device 14, forming a pattern layer 102 on this surface.

[0087] Extruder 13a produces the surface layer 103 of the laminated film. Extruder 13c produces the back layer 104 of the laminated film.

[0088] The laminating apparatus 15 generates a laminate 105 by layering a surface layer 103 extruded from the extruder 13a and a back layer 104 extruded from the extruder 13c onto a base layer 101 which has been extruded from the extruder 13b, stretched in the longitudinal direction by the longitudinal stretching apparatus 14, and further formed with a pattern layer 102 by the inkjet ejection apparatus 20.

[0089] Subsequently, the transverse stretching device 16 stretches the laminated body 105, which has been laminated by the laminating device 15, in the transverse direction (width direction) to produce a laminated film 100.

[0090] Subsequently, the laminated film 100 is subjected to processing such as trimming of both edges and measurement of its thickness. After that, the laminated film 100 is wound up by a winder (not shown) and sent to the subsequent finishing process.

[0091] (C) Effects As described above, according to the laminated film manufacturing system 1 as an example of an embodiment, the inkjet ejector 20 ejects a coating liquid onto the base layer 101 which has been stretched in the longitudinal direction by the longitudinal stretching device 14. The coating liquid ejected from the inkjet nozzle (not shown) of the inkjet ejector 20 forms small droplets, and the coating control unit 400 can precisely control the amount of coating, so the coating control unit 400 can form a highly accurate pattern layer 102 on the surface of the base layer 101.

[0092] Furthermore, after the inkjet ejector 20 forms a pattern layer 102 on the surface of the base layer 101, the laminating device 15 laminates a surface layer 103 onto the pattern layer 102 of the base layer 101, and a back layer 104 onto the back surface of the base layer 101. This makes it easy to create a pattern layer 102 between layers during the process of manufacturing the laminated film 100 by the extrusion lamination method. In other words, the laminated film 100 can be manufactured efficiently.

[0093] Furthermore, by forming the pattern layer 102 using the inkjet ejection device 20, even if the pattern of the pattern layer 102 changes due to, for example, a change in specifications, it can be easily handled by setting a new pattern using the coating control unit 400. In other words, a variety of patterns can be easily achieved.

[0094] Furthermore, since the inkjet ejector 20 is smaller than known roll coaters, it can be easily incorporated into a continuous laminated film manufacturing process. It also allows for miniaturization of the laminated film manufacturing system 1.

[0095] By using a fluorescent ink as the coating solution to form the pattern layer 102, for example, a highly anti-counterfeiting film can be obtained.

[0096] Furthermore, by forming a pattern layer 102 using a coating solution containing a release agent, a label with adhesive processing on at least one surface of the surface layer or back layer of this laminated film can be peeled off after being attached to an article, allowing the release agent portion to peel off and the design to stand out.

[0097] Furthermore, by forming a pattern layer 102 using a coating liquid containing a gas barrier agent, gas barrier properties can be easily imparted to the laminated film 100.

[0098] Furthermore, by forming a pattern layer 102 using a coating solution containing an ethyleneimine compound, the interlayer strength of the laminated film can be improved.

[0099] Furthermore, by forming a pattern layer 102 using a coating liquid containing a conductive material, a conductive laminated film 100 (conductive film) can be easily produced.

[0100] Furthermore, by using a coating solution containing capsules that encapsulate aromatic oils (aromatic oil capsules), a fragrance-retaining film can be easily produced.

[0101] Furthermore, a coating solution containing a resin and a colorant that changes color or color upon laser irradiation may be used. In this case, a pattern may be adopted in which the coating solution is applied solidly only to the area to be laser-marked. This makes it easy to obtain a laminated film 100 that can display variable information, etc., by laser marking.

[0102] Furthermore, by forming a pattern layer 102 using a coating solution containing an insecticide or antibacterial agent, a laminated film 100 with insecticide or antibacterial properties can be easily produced.

[0103] Furthermore, although the above-described embodiment includes a back surface layer 104 formed on the back surface of the base layer 101, the invention is not limited to this, and the formation of the back surface layer 104 may be omitted.

[0104] (D) Other The disclosed technology is not limited to the embodiments described above and can be implemented in various modified forms without departing from the spirit of this embodiment.

[0105] For example, the above-described embodiment shows an example in which the laminated film 100 has a structure in which a pattern layer 102 is formed on a base layer 101, but it is not limited to this. For example, the base layer 101 may be multilayered, and the pattern layer 102 may also be formed on the back surface of the base layer 101.

[0106] Figure 5 is a schematic diagram showing an example of the arrangement of inkjet ejectors 20a and 20b in a modified example of the laminated film manufacturing system 1.

[0107] When forming a pattern layer 102 on both sides of the base layer 101, the system includes an inkjet ejector 20a that forms the pattern layer 102 on the surface of the base layer 101, and an inkjet ejector 20b that forms the pattern layer 102 on the back surface of the base layer 101, as illustrated in Figure 5. These inkjet ejectors 20a and 20b have the same configuration as the inkjet ejector 20 described above.

[0108] In the example shown in Figure 5, the inkjet ejector 20b and the inkjet ejector 20a are arranged side by side in the vertical direction. The transport path of the base layer 101 stretched by the vertical stretching device 14 is bent and folded back using multiple transport rollers 201, thereby forming the pattern layer 102 on the front surface (first surface) of the base layer 101, which has already had the pattern layer 102 formed on its back surface (second surface) by the inkjet ejector 20b, by the inkjet ejector 20a.

[0109] By arranging the inkjet ejector 20b and the inkjet ejector 20a side by side in the vertical direction, the space required for this laminated film manufacturing system 1 can be reduced.

[0110] In the embodiment described above, an inkjet ejector 20 is provided between the longitudinal stretching device 14 and the transverse stretching device 16, and after the longitudinal stretching device 14 stretches the base layer 101 in the longitudinal direction, the inkjet ejector 20 forms the pattern layer 102 on the base layer 101. However, the embodiment is not limited to this. The inkjet ejector 20 may be provided upstream of the longitudinal stretching device 14, and after the inkjet ejector 20 forms the pattern layer 102 on the base layer 101, the longitudinal stretching device 14 stretches the base layer 101 in the longitudinal direction.

[0111] Furthermore, the above disclosure makes it possible for those skilled in the art to implement and manufacture this embodiment. [Explanation of Symbols]

[0112] 1. Laminated film manufacturing system 10a, 10b Raw material silos 11 Granulator 12a, 12b, 12c Pellet silo 13a, 13b, 13c Extruder 14. Longitudinal stretching device 15. Laminating machine 16 Lateral stretching device 161 clips 20a, 20b, 20 Inkjet ejector 100-layer film 101 Base layer 102 Coating layer (pattern layer) 105 Laminate 141a, 141b, 141c, 141d, 141 Conveyor Rollers 201 Conveyor Roller 400 Coating Control Unit

Claims

1. A method for manufacturing a laminated film having a base layer, a pattern layer, and a surface layer, A pattern layer formation step in which a pattern layer is formed on the substrate layer using an inkjet ejection device with a functional material, A surface layer formation step to form a laminate by forming a surface layer on the surface of the pattern layer using an extrusion lamination method with a surface layer forming material made of a thermoplastic resin composition, A stretching step of stretching the laminate in a transverse direction perpendicular to the transport direction of the laminate. Equipped with, The functional material is a coating liquid containing a release agent. A method for manufacturing a laminated film, characterized by the following:

2. The method for manufacturing a laminated film according to claim 1, characterized in that the functional material is a fluorescent ink.

3. The method for producing a laminated film according to claim 1, characterized in that the functional material is a coating liquid containing a gas barrier agent.

4. The method for producing a laminated film according to claim 1, characterized in that the functional material is a coating liquid containing an ethyleneimine compound.

5. The method for producing a laminated film according to claim 1, characterized in that the functional material is a coating liquid containing at least one of a conductive material and an aromatic oil capsule.

6. The method for manufacturing a laminated film according to claim 1, characterized in that the functional material is a coating liquid containing an insecticide or an antibacterial agent, and at least one of the base layer and the surface layer is a porous layer.

7. The method for manufacturing a laminated film according to claim 1, characterized in that the functional material is a coating liquid containing a resin and a colorant that develops or changes color upon irradiation with laser light, and the surface layer is transparent or translucent.

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