JP2023168004A - Method for manufacturing laminated film - Google Patents

Abstract

An object of the present invention is to efficiently produce a laminated film having a patterned layer made of various functional materials as an intermediate layer. A method for manufacturing a laminated film 100 having a base layer 101, a pattern layer 102, and a surface layer 103, in which a pattern layer 102 is formed on the base layer 101 using a functional material using an inkjet discharge device 20. and a surface layer forming step of forming 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. [Selection diagram] Figure 1

Description

The present invention relates to a technology for manufacturing a laminated film.

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

Further, the pattern layer is formed on the surface of the base layer by, for example, printing a pattern or design on the surface of the base layer using gravure printing or flexographic printing.

Japanese Patent Application Publication No. 2002-187387

However, in gravure printing and flexographic printing, when changing patterns or designs, the printing device must be stopped, resulting in product loss. Furthermore, it is difficult to improve counterfeit prevention by inserting variable information.

Furthermore, gravure printing and flexographic printing require large equipment, and it may be difficult to incorporate them into a laminated film production line.

One of the objects of the present invention is to enable efficient production of a laminated film having a patterned layer made of various functional materials as an intermediate layer.

For this reason, this method for producing a laminated film is a method for producing a laminated film having a base layer, a pattern layer, and a surface layer, in which a pattern layer is formed with a functional material on the base layer using an inkjet ejection device. and a surface layer forming 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.

According to one embodiment, a laminated film having a patterned layer made of various functional materials as an intermediate layer can be efficiently manufactured.

1 is a diagram illustrating a configuration of a laminated film manufacturing system as an example of an embodiment. 1 is a diagram schematically showing a configuration example of a longitudinal stretching device of a laminated film manufacturing system as an example of an embodiment. FIG. 1 is a diagram for explaining an inkjet ejection device of a laminated film manufacturing system as an example of an embodiment. FIG. 1 is a diagram schematically showing a configuration example of a lateral stretching device of a laminated film manufacturing system as an example of an embodiment. It is a figure which shows typically the example of arrangement|positioning of the inkjet discharge device in the modification of a laminated film manufacturing system.

Hereinafter, embodiments of the method for manufacturing the present laminated film will be described with reference to the drawings. However, the embodiments shown below are merely illustrative, and there is no intention to exclude the application of various modifications and techniques not specified in the embodiments. That is, this embodiment can be modified in various ways (such as combining the embodiment and each modification) without departing from the spirit thereof. Furthermore, each figure is not intended to include only the constituent elements shown in the figure, but may include other functions.

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

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.

In the example shown below, a laminated film 100 is shown in which a surface layer 103 is formed on the pattern layer 102 and a back layer 104 is formed below the base layer 101. At least one of the surface layer 103 and the back layer 104 may be referred to as the surface layer of the laminated film 100.

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, and after the first stretching step, Until the second stretching process is completed, it represents the "first stretched layer", and after the completion of the second stretching process, it represents the "porous base material layer".

Examples of the base layer forming material for forming the base layer 101 include a resin composition containing a thermoplastic resin. That is, the cast film layer, the first stretched layer, and the porous base material layer corresponding to the base layer 101 are all made of a resin composition containing a thermoplastic resin.

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

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

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 are used. can do. Note that the average particle size of the filler is the average primary particle size (D50), which is the volume average particle size measured with a particle size distribution analyzer using laser diffraction. From the viewpoint of obtaining a desired porosity, the filler content 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 45% by mass or more. The content is preferably at most 40% by mass, more preferably at most 35% by mass.

Specifically, calcium carbonate, calcined clay, silica, diatomaceous earth, talc, titanium oxide, barium sulfate, alumina, etc. can be used as the inorganic filler.

The organic filler is preferably an organic particle that is incompatible with the thermoplastic resin, has a melting point or glass transition temperature higher than that of the thermoplastic resin, and is finely dispersed under the melt-kneading conditions of the thermoplastic resin. For example, when the thermoplastic resin is an olefin polymer, examples of the organic filler include polyethylene terephthalate, polybutylene terephthalate, polycarbonate, nylon-6, nylon-6,6, a cyclic olefin homopolymer, and a cyclic olefin and ethylene polymer. It is preferable to use a copolymer with a melting point of 120°C to 300°C or a glass transition temperature of 120°C to 280°C.

The resin composition may further contain stabilizers, light stabilizers, dispersants, lubricants, optical brighteners, colorants, etc., if necessary.

The base layer 101 may have a single layer structure or a multilayer structure of two or more layers.

Both the surface layer 103 and the back layer 104 are made of a resin composition containing a thermoplastic resin. Moreover, the resin composition may contain a filler. In particular, when the surface layer or the back 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. As the thermoplastic resin, inorganic filler, and organic filler used for the surface layer 103 and the back layer 104, the same ones as those used for the base layer 101 can be used. Furthermore, the above-mentioned stabilizers, light stabilizers, dispersants, lubricants, optical brighteners, colorants, etc. may be added to the surface layer 103 and the back layer 104.

The surface layer 103 and the back layer 104 may each have a single layer structure or a multilayer structure of two or more layers. Further, at least a portion of the layers constituting the surface layer 103 and the back layer 104 may be uniaxially stretched.

The laminated film manufacturing system 1 illustrated in FIG. 1 includes 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, and a lateral stretching device. A device 16 and an inkjet ejection device 20 are provided.

These raw material silos 10a, 10b, granulator 11, pellet silos 12a, 12b, 12c, extruders 13a, 13b, 13c, longitudinal stretching device 14, laminating device 15, and horizontal stretching device constitute the laminated film manufacturing system 1. 16 and the inkjet ejection device 20 each implement a manufacturing process for manufacturing the laminated film 100.

Raw materials for the laminated film 100 are stored in the raw material silos 10a and 10b. Raw materials for the laminated film 100 include, for example, a thermoplastic resin, filler, and optional additives. Although the number of raw material silos in FIG. 1 is two, it is sufficient to provide as many as necessary.

The raw materials for the laminated film 100 may include recycled materials produced by processing scraps generated in the cutting process and the like during molding of the laminated film 100.

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

The granulator 11 adds a filler and, if necessary, various additives to a raw material thermoplastic resin to produce pellets of a resin composition.

The pellet silos 12a, 12b, and 12c each store pellets produced by the granulator 11. The pellet silo 12a supplies the pellets stored therein to the extruder 13a. The pellet silo 12b supplies the pellets stored therein to the extruder 13b. The pellet silo 12c supplies the pellets stored therein to the extruder 13c.

The extruders 13a, 13b, and 13c each extrude a molten thermoplastic resin in the form of a sheet from extruder dies (not shown).

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

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

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

The longitudinal stretching device 14 is disposed at a downstream position in the flow direction (conveyance direction) of the base layer 101, that is, the cast film layer extruded from the extruder 13b.

The longitudinal stretching device 14 stretches the base layer 101 extruded from the extruder 13b, that is, 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 vertical direction corresponds to the first direction.

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). Further, the longitudinal stretching device 14 realizes a first stretching step of stretching the base layer 101 (cast film layer) in the longitudinal direction (first direction).

In the longitudinal stretching device 14, for example, a plurality of (three in the example shown in FIG. 1) conveyance rollers are arranged parallel to each other in a direction perpendicular to the longitudinal stretching direction. Then, by making a difference in the peripheral speed of the conveying rollers, for example, a longitudinal tension is applied to the cast film layer between these conveying rollers, 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 circumferential speed between the roll groups.

When the thermoplastic resin used is an amorphous resin, the stretching temperature during stretching is preferably in a range equal to or higher than the glass transition temperature of the thermoplastic resin. In addition, when the thermoplastic resin is a crystalline resin, the stretching temperature must be within a range that is above the glass transition point of the amorphous portion of the thermoplastic resin and below the melting point of the crystalline portion of the thermoplastic resin. The temperature is preferably 2°C to 60°C lower than the melting point of the thermoplastic resin. Specifically, a stretching temperature of 100°C to 164°C is preferable for propylene homopolymer (melting point 155°C to 167°C), and a stretching temperature of 70°C to 133°C for high density polyethylene resin (melting point 121°C to 134°C). A stretching temperature of .

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

In addition, the stretching ratio can be determined as appropriate by considering the characteristics of the thermoplastic resin used. For example, when biaxially stretching is performed using a propylene resin, the stretching ratio is the area stretching ratio, and the lower limit 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.

FIG. 2 is a diagram schematically showing a configuration example of the longitudinal stretching device 14 of the laminated film manufacturing system 1 as an example of the embodiment.

In the example shown in FIG. 2, four conveyance rollers 141a, 141b, 141c, and 141d are arranged with their rotation axes perpendicular to the longitudinal direction so that their rotation axes are parallel to each other. . The four conveyance rollers 141a, 141b, 141c, and 141d are arranged along the flow direction of the base layer 101 in the following order: conveyance roller 141a, conveyance roller 141b, conveyance roller 141c, and conveyance roller 141d. Hereinafter, if the conveyance rollers 141a, 141b, 141c, and 141d are not particularly distinguished, they will be referred to as conveyance rollers 141.

Each of these conveyance rollers 141 is configured to be rotatable around a rotating shaft by a drive motor (not shown), and rotates in a direction along the flow of the base layer 101 while being in contact with the base layer 101 .

Further, in each conveyance roller 141, the rotational speed of the drive motor is controlled such that the peripheral speed of the conveyance roller 141 disposed downstream in the flow direction of the base layer 101 is faster. As a result, tension is generated in the base layer 101 between adjacent conveyance rollers 141 along the flow direction of the base layer 101, and the base layer 101 is stretched in the longitudinal direction.

An inkjet discharge device 20 is provided downstream of the longitudinal stretching device 14 and upstream of the lateral stretching device 16.

The inkjet discharge device 20 forms a pattern layer 102 on the surface of the base layer 101 by discharging a coating liquid onto the surface of the base layer 101 stretched by the longitudinal stretching device 14 . The base layer 101 stretched by the longitudinal stretching device 14 corresponds to a first stretched layer.

The inkjet discharge device 20 discharges particles of the coating liquid onto the first surface (surface) of the base layer 101 . Note that the inkjet discharge device 20 may discharge particles of the coating liquid onto the second surface (back surface) of the base layer 101.

The inkjet discharge device 20 realizes a coating process of forming a pattern layer 102 on the base layer (first stretched layer) 101 obtained in the longitudinal stretching device 14 (first stretching process).

FIG. 3 is a diagram for explaining the inkjet discharge device 20 of the laminated film manufacturing system 1 as an example of an embodiment.

The inkjet ejection device 20 is arranged along the width direction at a position facing the surface of the base layer 101. A plurality of ink ejection openings (nozzles) (not shown) are arranged at positions facing the base layer 101 in the inkjet ejection device 20 . These ink ejection ports are formed over the entire width direction of the base layer 101, and the coating liquid is ejected in the form of particles from each ink ejection port, and the coating liquid is applied to the surface of the base layer 101.

Ejection of the coating liquid from each ink ejection port of the inkjet ejection device 30 is controlled by a coating control section 400 (see FIG. 3). The coating control unit 400 controls the ejection of the coating liquid from each ink ejection port. For example, the coating control unit 400 can precisely control the amount of coating liquid to be ejected by controlling the ink ejection ports to turn on/off ejection.

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

The coating control unit 400 controls the ejection of a specific ink in the inkjet ejection device 30 by controlling the ejection on/off for any one of the plurality of ink ejection ports provided in the inkjet ejection device 20. It is possible to control the ejection of the coating liquid from the outlet and to suppress ejection from the ink ejection port. The driver software that controls the ejection of the inkjet ejection device 20 is well known, and detailed description thereof will be omitted.

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 for imparting some function to the laminated film.

The functional material is not particularly limited, but may be, for example, a fluorescent ink, a release agent, a gas barrier agent, an ethyleneimine compound, a conductive material, or a coating liquid containing 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 the pattern layer 102 on the surface of the base layer 101 depending on the type of coating liquid.

A pattern may be printed on the surface of the base layer 101 using an inkjet discharge device 20 using fluorescent ink as a coating liquid. As a result, when the manufactured laminated film 100 is irradiated with a black light, the design stands out, making counterfeiting difficult. That is, by using fluorescent ink as a coating liquid, a film with high anti-counterfeiting properties can be obtained. Note that in this case, it is desirable that the surface layer 103 be transparent or semitransparent.

Alternatively, a pattern may be printed on the surface of the base layer 101 using an inkjet discharge device 20 using a coating liquid containing a release agent. As a result, for example, when a label with an adhesive finish on at least one of the front and back layers is attached to an article and then peeled off again, the part with the release agent peels off, allowing the design to stand out. Become.

Further, a coating liquid containing a gas barrier agent may be used. Thereby, gas barrier properties can be easily imparted to the laminated film 100.

Furthermore, a coating liquid containing an ethyleneimine compound may be used. Thereby, the interlayer strength of the laminated film can be improved.

Further, a coating liquid containing a conductive material may be used. Thereby, the conductive laminated film 100 (conductive film) can be easily produced.

Furthermore, a coating liquid containing capsules containing aromatic oil (fragrant oil capsules) may be used. Thereby, a fragrance-preserving film can be easily produced.

Furthermore, a coating liquid containing a resin and a coloring material that develops or changes color upon irradiation with laser light may be used. In this case, a pattern may be adopted in which the coating liquid is applied all over only the area to be laser marked. Thereby, it is possible to easily obtain the laminated film 100 in which variable information and the like can be recorded by laser marking.
Note that when performing laser marking on the pattern layer 102, it is desirable that the surface layer 103 be transparent or semitransparent.

Further, a coating liquid containing an insect repellent or an antibacterial agent may be used. Thereby, the laminated film 100 having an insect repellent effect and an antibacterial effect can be easily produced. In this case, the base layer 101 or the surface layer 103 is a stretched resin film, and voids are formed in the film by stretching a resin composition containing a thermoplastic resin and a filler. It is desirable that the porous film (porous layer) is made of

In addition to the above-mentioned various coating liquids, in addition to a release agent, gas barrier agent, ethyleneimine compound, conductive material, aromatic oil capsule, insect repellent, or antibacterial agent, the various coating liquids also contain at least a dispersion medium that can dissolve or disperse these in a very small amount. Contains.

Further, the pattern forming the pattern layer 102 may be a geometric/regular pattern, an irregular pattern, some kind of design, letters, numbers, etc., and is not particularly limited. .

The laminating device 15 is arranged downstream of the extruders 13b, 13c and the inkjet discharge device 20.

The laminate device 15 applies a surface layer 103 extruded from the extruder 13a and a base layer 101 extruded from the extruder 13b, stretched in the longitudinal direction by the longitudinal stretching device 14, and on which the pattern layer 102 is formed by the inkjet ejection device 20. A laminate 105 is produced by pasting the back layer 104 extruded from the extruder 13c in a layered manner. The laminating device 15 forms the laminate 105 by an extrusion lamination method.

The laminating device 15 corresponds to a surface layer forming device 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. Further, the laminating device 15 realizes a surface layer forming step of forming 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.

The attachment of the surface layer 103 and the back layer 104 to the base layer 101 by the laminating device 15 can be realized by a known method, and a description thereof will be omitted.

The lateral stretching device 16 is arranged downstream of the laminating device 15.

The lateral stretching device 16 stretches the laminate 105 produced by the laminating device 15 in a direction (lateral direction, width direction) orthogonal to the longitudinal direction to form a laminate film 100. Note that since at least one of the base layer 101 and the surface layer 103 is a porous layer, if the resin composition for forming the layer contains a filler, voids may be formed in the layer due to this lateral stretching. , a porous layer is formed. The lateral direction corresponds to the second direction.

The lateral stretching device 16 corresponds to a second stretching device that stretches the laminate 105 produced by the laminating device 15 in the lateral direction (width direction, second direction) orthogonal to the longitudinal direction (first direction). . Further, the lateral stretching device 16 stretches the base layer 101 (first stretched layer) on which the pattern layer 102 is formed in the lateral direction (width direction, second direction) orthogonal to the vertical direction (first direction). A second stretching process is realized.

Note that in the second stretching step, as in the first stretching step, the base layer 101 is heated to a stretching temperature depending on the type of thermoplastic resin used, and stretching is performed.

FIG. 4 is a diagram schematically showing a configuration example of the lateral stretching device 16 of the laminated film manufacturing system 1 as an example of the embodiment.

The lateral stretching device 16 includes a plurality of (six in the example shown in FIG. 4) clips 161 that grip the edges of the laminate 105. These clips 161 are arranged in pairs at opposing positions on each of the two edges of the laminate 105 with the laminate 105 interposed therebetween. In the example shown in FIG. 4, three pairs of clips 161 are provided along the flow direction of the laminate 105.

In these plurality of clips 161, the pairs of clips 161 provided at opposing positions with the laminate 105 in between are moved in a direction away from each other while gripping the edge portion of the laminate 105, thereby removing the laminate. The body 105 is stretched in the lateral direction (width direction).

The clip 161 that grips the laminate 105 moves in the flow direction following the transport of the laminate 105, stretches the laminate 105 in the width direction, and releases the laminate 105 at a predetermined position. After that, each clip 161 returns to the upstream position in the transport direction of the stacked body 105 and grips the stacked body 105 again. In this manner, in the lateral stretching device 16, the laminate 105 is stretched in the lateral direction by repeatedly gripping, stretching, and releasing the laminate 105 using the plurality of 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 through this lateral stretching step, that is, the second stretching step.

Thereafter, the laminated film 100 is processed such as cutting on both edges and measuring the thickness. Thereafter, the laminated film 100 is wound up by a winder (not shown) and sent to the subsequent finishing process.

(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.

The granulator 11 adds fillers and arbitrary additives to the raw material thermoplastic resin as needed to produce pellets of the resin composition. The generated pellets are stored in pellet silos 12a, 12b, and 12c.

The pellet silo 12a supplies the pellets stored therein to the extruder 13a. The pellet silo 12b supplies the pellets stored therein to the extruder 13b. The pellet silo 12c supplies the pellets stored therein to the extruder 13c.

Extruder 13b produces base layer 101 (cast film layer). The base layer 101 produced by the extruder 13a is fed into the longitudinal stretching device 14.

The longitudinal stretching device 14 longitudinally stretches the base layer 101 extruded from the extruder 13b. The inkjet discharge device 20 discharges particles of the coating liquid onto the first surface (surface) of the base layer 101 (first stretched layer) stretched in the longitudinal direction by the longitudinal stretching device 14 to form a pattern layer 102 on this surface. do.

The extruder 13a produces the surface layer 103 of the laminated film. The extruder 13c also produces a back layer 104 of the laminated film.

The laminate device 15 applies a surface layer 103 extruded from the extruder 13a to a base layer 101 extruded from the extruder 13b, stretched in the longitudinal direction by the longitudinal stretching device 14, and further formed with a pattern layer 102 by the inkjet ejection device 20. The back layer 104 extruded from the extruder 13c is then laminated to form a laminate 105.

Thereafter, the lateral stretching device 16 stretches the laminate 105 laminated by the laminating device 15 in the lateral direction (width direction) to produce the laminated film 100.

Thereafter, the laminated film 100 is processed such as cutting on both edges and measuring the thickness. Thereafter, the laminated film 100 is wound up by a winder (not shown) and sent to the subsequent finishing process.

(C) Effect As described above, according to the laminated film manufacturing system 1 as an example of the embodiment, the inkjet discharging device 20 discharges the coating liquid onto the base layer 101 stretched in the longitudinal direction by the longitudinal stretching device 14. do. The coating liquid discharged from an inkjet nozzle (not shown) of the inkjet discharge device 20 has small droplets, and the coating control unit 400 can precisely control the coating amount. A highly accurate pattern layer 102 can be formed on the surface.

Further, after the inkjet discharge device 20 forms the pattern layer 102 on the surface of the base layer 101, the laminating device 15 laminates the surface layer 103 on the pattern layer 102 of the base layer 101 and the back layer 104 on the back surface of the base layer 101. do. Thereby, the pattern layer 102 can be easily provided between layers during the production of the laminated film 100 by the extrusion lamination method. That is, the laminated film 100 can be manufactured efficiently.

Furthermore, by forming the pattern layer 102 using the inkjet ejection device 20, even if the pattern of the pattern layer 102 is changed due to a change in specifications, for example, a new pattern can be created using the coating control unit 400. You can easily respond by setting this. In other words, pattern diversity can be easily realized.

Moreover, since the inkjet discharge device 20 is smaller than known roll coaters, it can be easily incorporated into a continuous laminated film production process. Furthermore, the present laminated film manufacturing system 1 can be downsized.

By forming the pattern layer 102 using fluorescent ink as a coating liquid, for example, a film with high anti-counterfeiting properties can be obtained.

In addition, by forming the pattern layer 102 using a coating liquid containing a release agent, a label with adhesive processing applied to at least one surface layer or back layer of this laminated film can be reused after being attached to an article. When it is peeled off, the part with the release agent peels off, allowing the pattern to stand out.

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

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

Further, by forming the pattern layer 102 using a coating liquid containing a conductive material, the conductive laminated film 100 (conductive film) can be easily produced.

Further, by using a coating liquid containing capsules containing aromatic oil (fragrant oil capsules), a scent-retaining film can be easily produced.

Furthermore, a coating liquid containing a resin and a coloring material that develops or changes color upon irradiation with laser light may be used. In this case, a pattern may be adopted in which the coating liquid is applied all over only the area to be laser marked. Thereby, it is possible to easily obtain the laminated film 100 that can be marked with variable information by laser marking.

Further, by forming the pattern layer 102 using a coating liquid containing an insect repellent or an antibacterial agent, the laminated film 100 having an insect repellent effect or an antibacterial effect can be easily produced.

Further, in the embodiment described above, the back layer 104 is formed on the back surface of the base layer 101, but the invention is not limited to this, and the formation of the back layer 104 may be omitted.

(D) Others The disclosed technology is not limited to the embodiment described above, and can be implemented with various modifications without departing from the spirit of the present embodiment.

For example, in the embodiment described above, an example is shown in which the laminated film 100 has a structure in which the pattern layer 102 is formed on the base layer 101, but the present invention 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.

FIG. 5 is a diagram schematically showing an arrangement example of the inkjet discharge devices 20a and 20b in a modified example of the laminated film manufacturing system 1.

When forming the pattern layer 102 on both sides of the base layer 101, as illustrated in FIG. and an inkjet ejection device 20b for forming the inkjet ejection device 20b. These inkjet discharge devices 20a and 20b have the same configuration as the inkjet discharge device 20 described above.

In the example shown in FIG. 5, the inkjet discharge device 20b and the inkjet discharge device 20a are arranged side by side in the vertical direction. Then, by bending and folding the conveyance path of the base layer 101 stretched by the longitudinal stretching device 14 using a plurality of conveyance rollers 201, a pattern layer 102 is formed on the back surface (second surface) by the inkjet discharge device 20b. A pattern layer 102 is formed on the surface (first surface) of the base layer 101 by using the inkjet ejection device 20a.

By arranging the inkjet discharging device 20b and the inkjet discharging device 20a vertically side by side in this way, space saving of the present laminated film manufacturing system 1 can be realized.

In the embodiment described above, the inkjet ejection device 20 is provided between the longitudinal stretching device 14 and the horizontal stretching device 16, and after the longitudinal stretching device 14 stretches the base layer 101 in the vertical direction, the base layer 101 is Although the inkjet discharge device 20 forms the pattern layer 102 in 101, the present invention is not limited thereto. An inkjet ejection device 20 is provided upstream of the longitudinal stretching device 14, and after the inkjet ejection device 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. You may do so.

Moreover, the present embodiment can be implemented and manufactured by those skilled in the art based on the above-mentioned disclosure.

1 Laminated film manufacturing system 10a, 10b Raw material silo 11 Granulator 12a, 12b, 12c Pellet silo 13a, 13b, 13c Extruder 14 Longitudinal stretching device 15 Laminating device 16 Lateral stretching device 161 Clip 20a, 20b, 20 Inkjet discharge device 100 Laminated film 101 Base layer 102 Coating layer (pattern layer)
105 Laminate 141a, 141b, 141c, 141d, 141 Conveyance roller 201 Conveyance roller 400 Coating control section

Claims (8)

A method for producing a laminated film having a base layer, a pattern layer and a surface layer, the method comprising:
a pattern layer forming step of forming a pattern layer of a functional material on the base layer using an inkjet ejection device;
A method for producing a laminated film, comprising the 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. The method for producing a laminated film according to claim 1, wherein the functional material is fluorescent ink. The method for producing a laminated film according to claim 1, wherein the functional material is a coating liquid containing a release agent. The method for producing a laminated film according to claim 1, wherein the functional material is a coating liquid containing a gas barrier agent. The method for producing a laminated film according to claim 1, wherein the functional material is a coating liquid containing an ethyleneimine compound. 2. The method for producing a laminated film according to claim 1, wherein the functional material is a coating liquid containing at least one of a conductive material and an aromatic oil capsule. The laminated film according to claim 1, wherein the functional material is a coating liquid containing an insect repellent or an antibacterial agent, and at least one of the base layer and the surface layer is a porous layer. manufacturing method. The laminated film according to claim 1, wherein the functional material is a coating liquid containing a resin and a coloring material that develops or changes color when irradiated with laser light, and the surface layer is transparent or translucent. manufacturing method.

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