JP7305929B2 - Laminated film three-dimensional processing method and apparatus - Google Patents

Description

TECHNICAL FIELD The present invention relates to a three-dimensional processing method for a laminated film, and more particularly to a three-dimensional processing method and apparatus capable of forming a wide overhang on a laminated film.

Sealing materials used as lids for bag-like containers such as pouches for filling semi-liquid or liquid contents such as food, beverages, detergents, etc., cup-like and tray-like containers may not include characters such as product names. There is a demand for differentiating products from other companies and increasing their commercial value by placing various designs on them. In order to meet such demands, printing is made three-dimensional to make characters and patterns stand out.
For example, in Patent Document 1, a bag-like container is formed using a soft packaging material, and a predetermined portion of the bag-like container is partially heated and cooled to form an embossed pattern. A method is proposed. However, according to the method of Patent Document 1, there is a problem that it takes time to heat and cool, resulting in poor productivity.

In addition, the inventors of the present invention performed cold compression molding in the thickness direction of a laminated film in which at least a soft inner film and a high-strength outer film on the outer surface side were laminated, so that the compression-molded part protruded to the outer surface side. A three-dimensional molding method for laminated films has been proposed (Patent Document 2). This patent document 2 describes that by compressing a laminated film with a rotary processing device using a pair of forming rolls, a projecting portion having a large amount of projecting can be efficiently formed.

JP-A-2004-142132 JP 2014-46655 A

However, according to Patent Document 2, by compression molding using a rotary processing device, it is possible to form an overhanging portion with a large overhanging height, but the overhanging portion has a wide width (processing width). When an attempt was made to form a portion, problems such as cracks occurring in the outer surface film of the laminated film or breakage of the laminated film occurred, making it impossible to form a wide overhang portion.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a three-dimensional processing method capable of forming a projecting portion having a wide processing width in a portion to be compression-molded by compression-molding a laminated film.
Another object of the present invention is to provide a three-dimensional processing method capable of forming a highly decorative projecting portion having a hologram-like appearance using a laminated film having a metal deposition layer.

According to the present invention, a laminated film having at least an inner film having a large elongation on the innermost surface and an outer film having a small elongation on the outer surface side is compression-molded in the thickness direction of the laminated film by a molding processing unit. In the three-dimensional processing method for projecting a part to the outer surface side, the molded part is made of a material that is softer and easier to stretch than the film constituting the laminated film, and in the compression molding, the molded part is elastically deformable. There is provided a three-dimensional processing method characterized by pressing the outer surface side of the laminated film while increasing the region in the plane direction.

In the three-dimensional processing method of the present invention,
1. said forming station being mounted on forming rolls of a rotary processing apparatus comprising opposing forming rolls and anvil rolls;
2. The processing width of the molding processing part is 6 mm or more,
3. The laminated film has a metal deposition layer between the inner film and the outer film;
4. The outer film with low elongation is a stretched film made of nylon or polyester, and the inner film with high elongation is a film made of polyolefin;
5. The molded portion is made of a polymer compound having a tensile modulus of 2.5 GPa or less;
6. The amount of compression in the compression molding is 30% or more and 50% or less with respect to the thickness of the laminated film;
is preferred.

According to the present invention, a laminated film having at least an opposing forming roll and anvil roll, and an inner film having a large elongation on the innermost surface and an outer film having a small elongation on the outer surface side provided on the forming rolls is compression molded. A rotary processing device for performing three-dimensional processing on a compression-molded portion of a laminated film, comprising a molding portion, wherein the molding portion is made of a material that is softer and more stretchable than the film constituting the laminated film, and A rotary processing device is provided, wherein the shape processing unit presses the outer surface side of the laminated film while increasing the elastic deformation area in the plane direction.
In the rotary processing apparatus of the present invention, it is preferable that the processing width of the forming processing portion is 6 mm or more.

According to the three-dimensional processing method of the present invention, it is possible to efficiently form a projecting portion having a large processing width without damaging the laminated film. In addition, since a gently sloping portion with a large processing width is formed, it is possible to prevent the formation of a resin pool.
Further, according to the three-dimensional processing method of the present invention, when two laminated films are superimposed, it is possible to form an overhanging portion with a large processing width on either one side of the laminated film or on both sides of the laminated film. In addition, the processing width of the projecting portion can be easily adjusted, and three-dimensional patterns of various patterns can be formed.
Furthermore, by using a laminated film having a metal deposition layer between the inner film and the outer film as the laminated film to be three-dimensionally processed, and by forming the overhanging portion with a large processing width, the overhanging portion has a hologram-like appearance. possible to form.

It is a figure for demonstrating the three-dimensional processing method of this invention using a press processing apparatus. It is a figure for demonstrating the three-dimensional processing method of this invention using a rotary processing apparatus. FIG. 4 is a diagram for explaining a method for forming a hologram-like projecting portion by the three-dimensional processing method of the present invention;

(Three-dimensional processing method and its apparatus)
In the three-dimensional processing method of the present invention, a laminated film having at least an inner film with a large elongation on the innermost surface and an outer film with a small elongation on the outer surface side is compression molded in the thickness direction of the laminated film by a molding unit. In the method of performing three-dimensional processing so that the compression-molded portion protrudes outward after the pressure is released, the molded portion can exhibit an elastic deformation region wider than the widest elastic deformation region of the films constituting the laminated film. An important feature is that it is formed from a flexible material.
That is, the fact that the elastic deformation region of the molded portion is wider than the widest elastic deformation region in the plane direction of the films constituting the laminated film means that the molded processed portion is formed by each film (inner surface film and outer surface film) constituting the laminated film. , or other films added as needed). As a result, during compression molding, the forming process part itself elongates and deforms to press the laminated film while increasing the processed area, efficiently imparting a large tensile action in the plane direction of the laminated film, and deforming the laminated film in the plane direction. can be widened, it is possible to form an overhang with a large processing width.
In addition, since the molded part deforms following the compression molding, it is possible to prevent a sudden change in the rate of change in pressure due to the application and release of compressive stress to the laminated film, and the overhang formed in the laminated film. It is effectively prevented that cracks and breakage occur in.
Furthermore, since the projecting portion formed by the three-dimensional processing method of the present invention has a large processing width, it is a gentle projecting portion. There are also benefits.

In the present invention, the molded portion is made of a material capable of realizing an elastic deformation region wider than the widest elastic deformation region in the plane direction of the films constituting the laminated film used. This allows sufficient stretching of all the films that make up the laminated film. Therefore, in the case where the laminated film has a two-layer structure of an inner film with a large elongation and an outer film with a small elongation, the elastic deformation region of the inner film with a large elongation is the widest among the films constituting the laminated film. The portion is made of a material capable of exhibiting an elastic deformation region wider than that of the inner film. Specific materials for the laminated film and the molded portion will be described later.
The protruding portion formed by the three-dimensional processing method of the present invention has a processing width 1.1 to 5 times that of the protruding portion formed using the forming processing portion made of a metal material having the same processing width. can be formed. Although it cannot be defined unconditionally depending on the composition and thickness of the laminated film, compression molding conditions, etc., it is possible to form an overhanging portion with a processing width of 10 to 50 mm and a processing height of 5 to 20 mm.

FIG. 1 is a diagram for explaining the three-dimensional processing method of the present invention using a press working device. As shown in FIG. 1, a laminated film 1 made up of an inner film 1a and an outer film 1b has the widest elastic deformation region, that is, a molded part 2 made of a material having an elastic deformation region wider than that of the inner film 1a. Laminated film 1 is placed between provided punch 3 and anvil 4 and pressed from above in the thickness direction of laminated film 1 . 1, so that both the outer film 1b and the inner film 1a of the laminated film 1 pressed by the molding portion 2 are pushed by the arrows in FIG. (tensile direction) to a greater extent than the elastic deformation region of the inner film 1a. After that, when the compressive force is released, the outer film 1b and the inner film 1a of the laminated film 1 are restored to different degrees, and as a result, as shown in FIG. It becomes possible to form the part 5 .
Moreover, since the forming process part 2 expands following the elongation deformation of the forming process part 2 and restores when the compressive force is released, as in the case of using a metal process part having a similar processing width, The laminated film does not crack or break.

In the three-dimensional processing method of the present invention, it is possible to form a projecting portion having a large projecting width even with the press working apparatus described above. However, as shown in FIG. It is particularly preferred to carry out the three-dimensional machining with a rotary machining device consisting of 12. That is, in the rotary processing device, the processing position moves in the direction of rotation, as compared with the case of using the press processing device described above. Since the tensile force acting on the film is increased as a result of accumulating the tensile force of pushing out the film on the side, it is possible to efficiently form the projecting portion with a large processing width.

In the present invention, it is preferable that the processing width of the forming processing portion is 6 mm or more, particularly in the range of 7 to 30 mm. When the processing width is smaller than the above range, it is not possible to form an overhang portion with a larger processing width than when it is within the above range. It is not possible to form an overhang with a sufficient overhang height compared to the case in the range.
The amount of compression is 30 to 50% of the thickness of the laminate film to be used. The amount of compression can be set by adjusting the clearance between the molding section and the anvil roll in the rotary processing device. If the amount of compression is less than the above range, it may not be possible to form a sufficient projecting portion. There is a risk of

In the three-dimensional processing method of the present invention, it is possible to form a protruding portion having a large processing width and a high height. The frictional force between the molded part and the laminated film may be increased by, for example, roughening the surface of the film. That is, when the frictional force between the molded part and the laminated film increases, the laminated film is restrained by the molded part, and the tensile force applied to the laminated film increases. can be formed.

Compression molding of the laminated film in the three-dimensional processing method of the present invention can be performed in the same manner as the three-dimensional processing method described in Patent Document 2 by the inventors of the present invention.
Also in the three-dimensional processing method of the present invention, the three-dimensional processing method can be applied not only to the laminated film alone (one sheet) but also to the state in which two laminated films are superimposed. When two films are superimposed, there is a mode in which only the laminated film on the forming processed part side is formed with the overhanging processed part, or there is a mode in which both laminated films are formed with the overhanging processed part projecting toward the outer film side. However, it can be processed into any mode by adjusting the compressive load acting on the laminated film.
In addition, when two laminated films are superimposed and overhang portions having a large processing width and a high processing height are formed on both laminated films, the press processing device is used to form and process portions. In the anvil and rotary processing device, the surface of the anvil roll is preferably made of a material capable of exhibiting an elastic deformation region wider than the widest elastic deformation region of the films constituting the laminated film, similarly to the forming processing part. be.
In addition, in the three-dimensional processing method of the present invention, the amount of stretching of the laminated film is very large in order to increase the processing width of the projecting portion. It is particularly desirable to process the laminated film in a state in which two sheets of the laminated film are laminated, for example, in the state of a pouch or the like in which the inner heat-sealable films of the laminated film are laminated.
The three-dimensional processing method of the present invention may be cold in which compression molding is performed without heating the laminated film, hot by heating to near the softening point temperature of the inner film, or between cold and hot. It may be carried out in an intermediate temperature range (warm). For example, when the inner film is polyethylene, at least the laminated film may be heated to a temperature of 35 to 80° C. or hot to a temperature of 80 to 100° C. If necessary, cooling may be performed after compression molding. conduct. In the case of warm or hot compression molding, three-dimensional processing can be performed with a smaller compressive load, and equipment can be simplified. In addition, when the cold compression molding is performed, the heating process of the laminated film and the cooling process after the compression molding are not required, so that three-dimensional processing can be performed efficiently.

(Molding processing department)
As described above, in the three-dimensional processing method of the present invention, the molded portion is formed from an elastic material capable of exhibiting an elastic deformation region that is wider than the widest elastic deformation region in the plane direction of the resin film that constitutes the laminated film to be used. is important. The molded portion may be entirely made of such an elastic material, or may be made of an elastic material in the vicinity of the surface of the molded portion. Also, it is possible to control the width of the elastic deformation region of the molded portion.
The elastic material capable of forming the molded part is not limited to this when using a laminated film described later, but the following elastic materials can be used.
For example, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, acrylic rubber, ethylene-propylene rubber, hydrin rubber, urethane rubber, silicone rubber, various crosslinked rubbers such as fluororubber, styrene , polyolefin-based, polyvinyl chloride-based, polyurethane-based, polyester-based, polyamide-based, polybutadiene-based, trans-polyisoprene-based, fluororubber-based, chlorinated polyethylene-based thermoplastic elastomers, or styrene-based, urethane-based, etc. Foamed materials may be mentioned.
Among these, polymer compounds having a tensile modulus of 2.5 MPa or less can be preferably used.

(Laminated film)
In the three-dimensional processing method of the present invention, as the laminated film to be used, a laminated film having at least a film with a small elongation as an outer film positioned in the extension direction and a film with a large elongation as an inner film is used. As a result, when the laminated film is compressed in the thickness direction, the inner film, which has a large elongation, is extruded from the compressed surface due to elastic deformation, and the outer film, which has a small elongation, is plastically deformed according to the elongation of the inner film. It grows by When the compressive force is released, the inner film recovers greatly, while the outer film recovers little, so there is a difference in the amount of recovery between the inner and outer films, and a protruding portion that protrudes toward the outer film is formed. .
As the film with high elongation used as the inner film, it is preferable to use a film having heat-sealing properties made of polyolefin such as polyethylene or polypropylene. It is desirable to use stretched films such as "PET". Among the above-described films constituting the laminated film, the film constituting the inner surface film and having a large elongation has the widest elastic deformation region, which serves as a reference for the elastic deformation region of the material constituting the molded portion.

In the three-dimensional processing method of the present invention, another resin film may be provided between the inner film and the outer film of the laminated film. In particular, by including a metal-evaporated film such as an aluminum-evaporated film, not only does it have a metallic luster as the ground color, but also the above-mentioned three-dimensional processing causes light interference to form a hologram-like appearance in the overhanging part. it becomes possible to
That is, the laminate film 20 shown in FIG. are arranged so that As is clear from the enlarged schematic view of the metal vapor deposition layer portion of FIG. It is immobilized by the agent 23c. When this laminated film 20 is subjected to the three-dimensional processing method of the present invention, as shown in FIG. Diffuse reflection of light increases, light interference occurs, and a hologram-like appearance can be obtained.
In order to form a hologram-like appearance due to the vapor-deposited metal layer on the protruding portion, the vapor-deposited metal layer must be sufficiently stretched under tensile stress. Adjacent to high elongation material is desirable.

In the laminated film, not only the vapor-deposited metal layer described above, but also other layers such as a topcoat layer may be formed on the outer side of the outer film as long as the effects of the present invention are not impaired.
Laminated films include, but are not limited to, polyethylene film/stretched nylon film, polyethylene film/stretched nylon film/stretched PET film, polyethylene film/stretched PET film/stretched nylon film, polyethylene film/ Aluminum vapor deposition stretched nylon film/stretched PET film, polyethylene film/aluminum vapor deposition stretched PET film/stretched nylon film, polypropylene/stretched nylon film, polypropylene film/stretched nylon film/stretched PET film, polypropylene film/stretched PET film/stretched nylon Examples include films, polypropylene film/stretched nylon film by aluminum vapor deposition/stretched PET film, polypropylene film/stretched PET film by vapor deposition aluminum/stretched nylon film, and the like.

The thickness of the inner film and the outer film before three-dimensional processing of the laminated film is not limited to this from the viewpoint of the moldability of the overhanging portion and the amount of stretching in the overhanging portion, but the thickness of the inner film is 50 to 150 μm. , the thickness of the outer film is in the range of 12 to 25 μm, and the thickness of the inner film is about 3 to 20 times that of the outer film.
Furthermore, when other layers are provided on the laminated film, it is desirable that the total thickness of the laminated film is in the range of 60 to 250 μm.

1 Laminated film 2 Molding processing unit 3 Punch 4 Anvil (cradle) 5 Overhang 10 Molding processing unit 11 Molding roll 12 Anvil roll 20 Laminated film 21 Outer film 22 Inner film 23 Metal deposition film.

Claims (9)

A laminated film having at least an inner film with a large elongation on the innermost surface and an outer film with a small elongation on the outer surface side is compression-molded in the thickness direction of the laminated film by a molding processing part, so that the compression-molded part is stretched on the outer surface side. In the three-dimensional processing method to make it come out,
The molded part is made of a material that is softer and more easily stretched than the film constituting the laminated film,
The three-dimensional processing method, wherein the compression molding is performed by pressing the outer surface side of the laminated film while the molding processing unit increases the elastic deformation region in a plane direction. 2. The three-dimensional processing method according to claim 1, wherein the forming processing section is installed on forming rolls of a rotary processing device having opposing forming rolls and anvil rolls. 3. The three-dimensional processing method according to claim 1, wherein the processing width of said forming processing portion is 6 mm or more. The three-dimensional processing method according to any one of claims 1 to 3, wherein the laminated film has a vapor deposition layer between the inner film and the outer film. The three-dimensional processing method according to any one of claims 1 to 4, wherein the outer film with low elongation is a stretched film made of nylon or polyester, and the inner film with high elongation is a film made of polyolefin. 6. The three-dimensional processing method according to claim 5, wherein said molded portion is made of a polymer compound having a tensile elastic modulus of 2.5 GPa or less. The three-dimensional processing method according to any one of claims 1 to 6, wherein the compression amount in the compression molding is 30% or more and 50% or less with respect to the thickness of the laminated film. Equipped with opposing forming rolls and anvil rolls, and a forming processing section provided on the forming rolls for compression-molding a laminated film having at least an inner film having a large elongation on the innermost surface and an outer film having a small elongation on the outer surface side. , in a rotary processing device that performs three-dimensional processing on a compression-molded portion of a laminated film,
The molded part is made of a material that is softer and more easily stretched than the film constituting the laminated film,
The rotary processing device, wherein the molding processing unit presses the outer surface side of the laminated film while increasing the elastic deformation area in a plane direction. 9. The rotary processing apparatus according to claim 8, wherein the processing width of said forming processing portion is 6 mm or more.

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