JPH10329170A - Acryl insert molding, its manufacture and multilayer film for insert molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an acryl insert molding without positional deviation at the time of inserting of an acrylic film into a vacuum mold, acryl insert molding, and a multilayer film for insert molding. SOLUTION: Necessary parts of an acrylic film 2 separable from a protective film 1 and a multilayer film 6 having a thickness of 200 to 1000 μm laminated at least with a design layer formed by printing are processed in a three- dimensional shape on the film 1, cut and separated, a three-dimensional multilayer 20 is mounted in a cavity of the movable mold 13 of an insert mold, molds are closed, and molding resin is injected in a cavity. And, the resin is integrally adhered to the design layer side of the film 20 simultaneously upon molding of the molding, and then the molding is removed from the mold, and the film 1 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic insert molded product used for the application of automotive interior parts such as panels and instruments manufactured by vacuum forming, and in particular, automotive exterior parts and the like. The present invention relates to a production method and a multilayer film for insert molding. Hereinafter, a method based on putting a film in a mold and integrally bonding with a molding resin is referred to as “insert molding”.

[0002]

2. Description of the Related Art There are the following methods for producing a conventional acrylic insert molded product. (1) A required part is formed by cutting a required part into a three-dimensional shape using a vacuum forming die and then using a cutting die to form an insert forming film made of an acrylic film having a thickness of about 150 μm on which a picture layer is printed. And insert the three-dimensional acrylic film into the cavity of the insert molding die, close the mold and inject the molding resin into the cavity, and at the same time as molding the resin molded product, apply the molding resin to the pattern layer side of the acrylic film There is a method of integrally bonding.

(2) A multilayer film having a thickness of about 150 μm, in which an acrylic film, a picture layer, and a reinforcing sheet (adhering to a molding resin) are laminated, is subjected to three-dimensional processing by vacuum forming, followed by punching. The part is cut off, a three-dimensional acrylic film is mounted in the cavity of the insert molding die, the mold is closed, the molding resin is injected into the cavity, and the molding resin is integrated with the reinforcing sheet side of the multilayer film simultaneously with the molding of the resin molded product There is a method of bonding.

[0004]

However, in (1),
The yield of finished products and production efficiency were poor. That is, the conventional insert molding film is weak and easily deformed. Therefore, when it is inserted into a vacuum forming die, a cutting die, or a die for insert molding, it is quickly bent and is difficult to position in the die. For this reason, it takes a long time for positioning, and it is easy to obtain a finished product in which the picture is misaligned. Further, the conventional insert molding film is not stable because of its small weight. Therefore, even if it is positioned once in a vacuum forming die, a cutting die, or an insert molding die, the film is likely to be displaced due to vibration of the die. For this reason, it takes a long time for positioning, and it is easy to obtain a finished product in which the picture is misaligned. Further, the conventional insert molding film has a small thickness. Therefore, when cutting, the acrylic film is easily caught in the gap between the blades of the cutting die, so that the acrylic film is poorly cut. Further, tearing and uneven stretching were likely to occur during vacuum forming during three-dimensional processing. For this reason, it was easy to obtain a finished product in which the pattern was broken or deformed, and the film had jagged edges. In addition, the conventional insert molding films have low shape retention. Therefore, even if the acrylic film could be processed into a three-dimensional shape, the acrylic film easily collapsed when being transferred to the cavity of the insert molding die. For this reason, it was difficult to transfer the acrylic film, and it was difficult to mount the acrylic film in the cavity of the insert molding die.

In (2), since the insert molding film has a reinforcing sheet, the insert molding film has a certain degree of rigidity, weight, and shape retention, and the problem (1) is unlikely to occur. It becomes easier to produce insert molded products with impaired gloss and texture. In other words, since the acrylic film is a delicate material, if it is brought into direct contact with the mold surface of a vacuum molding die or cutting die, or even the metal surface of the cavity forming surface of the insert molding die, it can press fine irregularities on the die surface. This is because the acrylic film has fine irregularities or dust due to traces and scratches due to friction or friction, and picking up dust and dirt.

The present invention solves the above-mentioned drawbacks, and provides a method of manufacturing an acrylic insert molded product and a multilayer film for insert molding in which the position of the acrylic film is prevented from being shifted when the acrylic film is inserted into a vacuum mold or the like. The purpose is to provide.

In order to achieve the above object, the method for manufacturing an insert molded product according to the present invention has a thickness at which at least an acrylic film releasable from the protective film and a pattern layer formed by printing are laminated on the protective film. 2
The required part of the multilayer film of 00 μm to 1000 μm is processed into a three-dimensional shape and cut off, the three-dimensional multilayer film is mounted in the cavity of the insert molding die, the mold is closed, the molding resin is injected into the cavity, and the resin molded product is formed. After the resin is integrally bonded to the pattern layer side of the three-dimensional multilayer film at the same time as the molding, the resin molded product is taken out of the mold and the protective film is peeled off. In order to achieve the above object, the insert molded product of the present invention is characterized in that an acrylic film having a pattern layer laminated by printing is integrally bonded to a three-dimensional resin molded product surface. Things. In addition, in order to achieve the above object, a multilayer film for insert molding of the present invention is a multilayer film in which a picture layer and an adhesive layer are formed by printing on one side of an acrylic film having a thickness of 50 μm or more, and a protective film is laminated on the other side. If the film thickness is 2
It is characterized in that it is from 00 μm to 1000 μm.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The method for producing an acrylic insert molded product according to the present invention has a thickness of at least 200 μm to 1000 μm on which a pattern layer formed by printing an acrylic film that can be peeled off from the protective film and a print layer is laminated.
Process the required part of the μm multilayer film into a three-dimensional shape and cut it off, mount the three-dimensional multilayer film in the cavity of the insert molding die, close the mold, inject molding resin into the cavity, and mold the resin molded product At the same time, after the molding resin is integrally bonded to the picture layer side of the three-dimensional multilayer film, the resin molded product is taken out of the mold and the protective film is peeled off.

First, a multilayer film 6 for insert molding which can be applied to the manufacturing method of the present invention will be described. As an example, the multilayer film 6 is a multilayer film in which the picture layer 4 is formed on one side of the acrylic film 2 by printing, and the protective film 1 is laminated on the other side, and has a thickness of 200 μm to 1000 μm.

The acrylic film 2 is a film which can be easily formed into a three-dimensional shape of the cavity forming surface 15 of the insert molding die by vacuum forming or punching, which will be described later, and which can be peeled off from the protective film 1 which will be described later. The acrylic film 2 preferably has a thickness of 50 μm or more. With this value, the acrylic film alone is used as printing paper, and the pattern layer 4 is printed by a rotary printing press.
This is effective because the printing layer 3 such as the adhesive layer 5 can be directly formed on the acrylic film 2. That is, according to the rotary printing press, the acrylic film 2 in a tensioned state is unwound from a roll and wound on another roll. Printing is performed on the acrylic film 2 during the period from unwinding to winding, and an insert film is formed through drying and cooling of the printing layer. When the acrylic film 2 is smaller than 50 μm, unnecessary stretching, heat wrinkling, poor registration, cutting, and the like are likely to occur in the acrylic film 2 as printing paper due to the tension.

The acrylic film 2 comprises, for example, 80 to 90 parts by weight of polymethyl methacrylate, 20 to 5 parts by weight of polybutyl acrylate, and 0 additives (such as an ultraviolet absorber).
30 to 80 μm in thickness consisting of 5 parts by weight. Alternatively, a thickness 50 of 50 to 80 parts by weight of polymethyl methacrylate, 15 to 50 parts by weight of polybutyl acrylate, and 0 to 5 parts by weight of an additive (such as an ultraviolet absorber)
〜100 μm.

The acrylic film 2 may have weather resistance. The weather resistance of the acrylic film 2 may be inherent to the acrylic film 2 in some cases. in this case,
It is preferable to use a film made of a resin mixed with an ultraviolet absorber. The weather resistance of the acrylic film 2 may be obtained by forming a weather resistant layer on the acrylic film 2. The weather-resistant layer is formed by forming a low-temperature drying transparent coating agent made of fluorine or acrylic resin on the acrylic film 2 by roll coating, reverse coating, offset printing, gravure printing, or the like. Further, the acrylic film 2 may have been subjected to a low-adhesion treatment. Moreover, the acrylic film 2 may form an overcoat layer or an overcoat film in order to increase the surface frictional strength of the acrylic film after the protective film 1 is peeled off. The overcoat layer or the overcoat film may be a hard coat layer or a hard coat film.
In addition, the acrylic film 2 has a plasticizer-resistant protective layer or a plasticizer-resistant protective film for preventing the surface of the acrylic film 2 after peeling off the protective film 1 from being plasticized and fixed by contact with the vinyl chloride film. May form. These overcoat layers and overcoat films, or the plasticizer-resistant protective layer and the plasticizer-resistant protective film may have a low adhesion function. The acrylic film 2 is composed of a protective film 1 and a low-adhesion layer 19 described later.
Through a lamination method or the like (FIG. 7)
reference). After the lamination, the acrylic film 2 may be provided with perforations or the like.

The picture layer 4 is formed on the entire surface or a part of the surface of the acrylic film 2 by printing. The picture layer 4 is for representing characters, figures, symbols, etc. on the surface of the insert molded product, or for representing a colored surface. It is to be noted that a character, a figure, a symbol, or the like, or a colored surface can be represented by a metal vapor-deposited layer composed of a vapor-deposited film. The picture layer 4 is composed of at least one layer selected from the group consisting of a pigment ink layer composed of a pigment and a resin binder, a glitter pigment layer composed of a pearl pigment and a resin binder, and a dye ink layer composed of a dye and a resin binder. The multilayer film used in the present invention has, for example, an adhesive layer formed by printing in addition to the picture layer. As described above, the layers formed by printing are generally referred to as printing layers. The adhesive layer is a layer for improving the adhesiveness to a molding resin 17 described later, that is, a resin molded product 18. The adhesive layer 5 may be made of a polyvinyl chloride-vinyl acetate copolymer resin, an acrylic resin, a urethane resin, or the like. The printing layer 3 may be formed by a normal printing method such as an offset printing method, a gravure printing method, a screen printing method, or a coating method such as a roll coating method or a spray coating method. Since the adhesive layer 5 is formed by printing ink, it is effective because it is less expensive than using a thick adhesive sheet.

The protective film 1 is a film which is not easily expanded and contracted by heat, and has a thickness of 200 in a state where it is attached to the acrylic film 2 on which the picture layer 4 is formed by printing.
The thickness is such that the multilayer film 6 has a thickness of μm to 1000 μm. The thickness of the multilayer film 6 is 200 μ
When it is smaller than m, it is difficult to have appropriate deformability that is not easily understood, stability that does not shift due to vibration or the like, and shape retention that is not easily deformed by a weak external force after being processed into a three-dimensional shape. If the thickness of the multilayer film 6 is larger than 1000 μm, swelling occurs when the long multilayer film 6 is wound into a roll shape, so that it is necessary to suppress the winding amount. When the thickness of the protective film 1 is 500 μm or less, it is effective because the winding amount is not too small.

The protective film 1 is, for example, 20 to 100
0 μm polyvinyl chloride film, amorphous or low crystalline polyester film, amorphous or low crystalline polypropylene film, polybutylene terephthalate film, unstretched or low stretched ethylene vinyl alcohol film, heat-resistant polyethylene film, etc. There is.

The protective film 1 may have been subjected to a low-adhesion treatment so that it can be separated from the acrylic film 2.
The low-adhesion-treated protective film is, for example, as a protective film, by using a mixture of a rosin-based, a tempel-based, a petroleum-based tackifying resin and a polyolefin, and a hot-melt resin such as polystyrene.
Some protective films themselves are made of a low-adhesive resin.
The low-adhesion treatment may be performed by forming the low-adhesion layer 19. The low adhesive layer 19 is made of natural rubber, synthetic rubber,
There is a method of forming a pressure-sensitive adhesive made of a silicone or acrylic hot melt resin on a protective film by reverse coating, roll coating, gravure printing, or the like. Due to the low adhesion treatment, the protective film and the acrylic film are adhered at the time of three-dimensional processing to be described later, but are in a state where the protective film can be easily peeled off by hand. For example, as a peel strength, it is 0.
Some have a weight of 01 to 0.5 kg. The protective film 1 and the acrylic film 2 may be peelable over the entire surface, or may be peelable only partially.

Hereinafter, a method for producing the acrylic insert molded product of the present invention using the multilayer film will be described.

First, a necessary portion of a multilayer film 6 having a thickness of 200 μm to 1000 μm and having an acrylic film 2 and a picture layer 4, which can be peeled off from the protective film 1, is processed into a three-dimensional shape and cut off on the protective film 1. An original multilayer film is obtained (see FIG. 1). Multilayer film 6
May be wound once on a roll shaft and continuously inserted into a vacuum forming device 10 or a press cutting device 7 described later as a roll-shaped roll. Alternatively, it may be continuously inserted as a sheet-shaped multilayer film 6 having a predetermined size into a vacuum forming device 10 or a press cutting device 7 described later.

In order to process the multilayer film 6 into a three-dimensional shape, for example, a vacuum forming apparatus 10 or a press forming apparatus may be used.
Means for forming a normal plastic sheet into a desired three-dimensional shape may be used. The mold used in the vacuum molding apparatus 10 and the press molding apparatus has a concave portion having exactly the same shape as the cavity forming surface 15 of the insert molding die for molding a desired three-dimensional resin molded product 18 described later. There is a type in which a multilayer sheet is brought into close contact with the inner surface of a concave portion. Alternatively, there is a type having a convex portion 12 on which the cavity forming surface 15 of the insert molding die is copied, in which the multilayer film 6 is brought into close contact with the outer surface of the convex portion. In the latter type, the acrylic film 2 and the projection 12
And the print layer 3 is interposed between them. The vacuum forming device 10 has a vacuum suction hole 11. In order to facilitate processing of the multilayer film 6, the multilayer film 6 may be heated and softened during press molding or vacuum molding.

The multi-layer film 6 is cut off by a press cutting device 7 composed of a punching die having a knife or a cutting blade 9, a sliding cutting die, or a heat cutting device, a laser cutting device, a Thomson punching device, a Heizel punching device, a pons. Normal plastic sheet cutting means such as a punching device may be used. As a result of the separation, the shape of the necessary portion of the multilayer film 6 does not protrude from the cavity forming surface 15 of the insert molding die for molding the desired three-dimensional resin molded product 18 described later.
Alternatively, the shape of the necessary portion of the multilayer film 6 has a shape that at least does not protrude from the periphery of the desired three-dimensional resin molded product 18 obtained by the insert molding die described later.

Either the processing of the multilayer film 6 into a three-dimensional shape or the separation of the multilayer film 6 may be performed first, but they can also be performed simultaneously by using a press die with a cutting blade. (See FIG. 1).

Next, the three-dimensional multilayer film 20 is mounted in the cavity of the insert molding die, the mold is closed, and the molding resin 17 is injected into the cavity. After integrally forming the molding resin 17 on the picture layer 4 side, the resin molded product 18 is taken out of the mold, and the protective film 1 is peeled off (FIGS. 2 to 6).

The insert molding dies include injection molding dies and compression molding dies. Insert molding dies are
Fixed mold 1 having gate 16 for injecting molding resin 17
4 and movable mold 13 and the like, and fixed mold 14 and movable mold 13
In some cases, one or more cavities surrounded by the cavity forming surface 15 of the fixed mold 14 and the movable mold 13 are formed by closing the mold. The cavity may form a hole in the resin molded product 18. The cavity forming surface 15 for mounting the three-dimensional multilayer film 20 may be formed on either the fixed mold 14 or the movable mold 13. The multilayer film 6 may be inserted so that the printing layer side faces the cavity forming surface 15 of the fixed mold 14, or may be inserted so that the printing layer side faces the cavity forming surface 15 of the movable mold 13. Good. The transfer of the three-dimensional multilayer film 20 from the vacuum forming device 10 or the press cutting device 7 to the insert molding die may be performed automatically by grasping the three-dimensional multilayer film 20 by a robot or manually. (See FIG. 2). The mounting of the three-dimensional multilayer film 20 may be fixed by suctioning from the cavity forming surface 15 of the injection mold.

The molding resin 17 includes resins such as polypropylene resin, acrylonitrile butadiene styrene resin, polystyrene resin, ethylene vinyl acetate resin, polycarbonate resin and nylon resin. Multilayer film 6
Is not processed into a three-dimensional shape, the multilayer film 6 is brought into close contact with the cavity forming surface 15 of the mold by the injection pressure of the molding resin 17 or the like. Resin molding 18
After cooling, the mold is opened, and an acrylic insert molded product in which the acrylic film 2 on which the picture layer 4 is laminated by printing is integrally bonded to the surface of the three-dimensional resin molded product 18 is taken out (see FIG. 5). Finally, the protective film 1 is peeled off (see FIG. 6).

[0025]

【Example】

Example 1 A molding for automobile exterior parts was manufactured under the following conditions. As the protective film of the multilayer film for insert, an amorphous polyethylene terephthalate film having a thickness of 200 μm, which was low-adhesion treated with urethane resin, was used. The acrylic film is 200 μm thick HBS0 manufactured by Mitsubishi Rayon Co., Ltd.
06 (etch ZERO ZERO ROCK) was used. As the printing layer, a glitter pigment layer and an adhesive layer were laminated. The metal deposition layer
400 mm thick between the acrylic film and the bright pigment layer
Of chromium deposited film. The glitter pigment layer was formed by a gravure printing method using an acrylic resin-based ink containing an aluminum pigment. The adhesive layer was formed by a gravure printing method using a chlorinated polypropylene resin-based ink. This multi-layer film for inserts is formed by first forming each of the above-mentioned layers by printing on one side of an acrylic film, pasting a protective film on the other side, drying at a temperature of 60 ° C., and then cooling to room temperature, The subsequent thickness was 412 μm. The multilayer film for insert was once wound around a roll shaft to form a roll-shaped roll. The multilayer film for insert molding was unwound from the roll-shaped roll and inserted into a press die with a cutting blade. In the press die with a cutting blade, a concave portion having an inner surface in close contact with the cavity forming surface of the injection molding die was formed, and a vacuum suction hole was formed in the concave portion. The multilayer film for insert molding was vacuum-sucked into the concave portion and vacuum-molded into a three-dimensional shape of a molding for an automobile exterior part to obtain a three-dimensional multilayer film. The three-dimensional multilayer film was cut by a cutting blade of a press die, and cut off from the multilayer film for insert of a roll. The vacuum forming process was performed by vacuum forming with a vacuum suction force of 1.5 atm while heating the multilayer film to about 150 ° C. with a heater at 280 ° C. Next, the protective film of the three-dimensional multilayer film was attached to the cavity of the insert mold so that the protective film was in close contact with the cavity forming surface. Next, a molding temperature of 200 ° C. is applied to a cavity formed by closing the fixed mold and the movable mold.
Injection molding of polypropylene resin as a molding resin at ~ 220 ° C and mold temperature of 40 ° C to 60 ° C, and simultaneous molding of the resin molded product and integral bonding of the molding resin to the picture layer side of the multilayer film to form a polypropylene resin molded product After cooling, the resin molded product was taken out of the mold, and the protective film and the low-adhesion layer were separated from the acrylic film and the printing layer. 15m metal acrylic film appeared on the outermost surface
A m-thick mall was obtained.

Example 2 A wood grain consoler for an automobile interior part was manufactured under the following conditions. As a protective film of the multilayer film for insert, a heat-resistant polyethylene film having a thickness of 75 μm, which was subjected to a low-adhesion treatment with a urethane resin, was used. Acrylic film
HBS006 manufactured by Mitsubishi Rayon Co., Ltd. having a thickness of 200 μm was used. The printing layer includes a wood grain conduit pattern layer, a wood grain base layer, and an adhesive layer. The grain pattern layer was formed by a gravure printing method using an acrylic resin ink containing carbon black. The wood grain base layer was formed by a screen printing method using an acrylic resin-based ink containing bengara. The adhesive layer was formed by a screen printing method using a vinyl resin-based ink. This multi-layer film for inserts is formed by first forming each of the above-mentioned layers by printing on one side of an acrylic film, pasting a protective film on the other side, then drying at a temperature of 70 ° C., and then cooling to room temperature. Later thickness was 293 μm. The multilayer film for insert was once wound around a roll shaft to form a roll-shaped roll. The multilayer film for insert molding was unwound from the roll-shaped roll and inserted into a press die with a cutting blade. In the press die with a cutting blade, a recess having an inner surface that is in close contact with the cavity forming surface of the injection molding die is formed,
The concave portion had a vacuum suction hole formed therein. The multilayer film for insert molding was vacuum-suctioned into the concave portion and vacuum-processed into a three-dimensional shape of a consoler for automobile interior parts to obtain a three-dimensional multilayer film. The three-dimensional multilayer film was cut by a cutting blade of a press die, and cut off from the multilayer film for insert of a roll. The vacuum forming process
While the multilayer film was heated to about 140 ° C. by a heater at 250 ° C., vacuum forming was performed with a vacuum suction force of 1.2 atm. The molding time was about 5 seconds. Next, the protective film of the three-dimensional multilayer film was attached to the cavity of the insert mold so that the protective film was in close contact with the cavity forming surface. Next, a molding temperature of 200 ° C. to 220 ° C. and a mold temperature of 40 ° C. are formed in a cavity formed by closing the fixed mold and the movable mold.
Injection molding of polypropylene resin as molding resin at ℃ to 60 ° C, molding resin is integrally bonded to the pattern layer side of the multilayer film at the same time as molding of resin molding, and after cooling polypropylene resin molding, resin molding Was removed from the mold, and the protective film and the low-adhesion layer were separated from the acrylic film and the printing layer. An 8 mm-thick consoler having a wood-grained acrylic film on the outermost surface was obtained.

Example 3 A silver side mat guard was manufactured under the following conditions. As the protective film of the multilayer film for the insert, a 200 μm-thick vinyl chloride film that had been subjected to a low-adhesion treatment with a urethane resin was used. The acrylic film used was HBS006 (etch VS zero zero lock) manufactured by Mitsubishi Rayon Co., Ltd. and having a thickness of 200 μm. The printing layer includes a glitter pigment layer, a base pigment layer, and an adhesive layer. The glittering pigment layer was formed by a reverse coating method using a urethane resin-based ink containing an aluminum pigment. The base pigment layer was formed by a reverse coating method using an ink obtained by mixing a gray urethane resin at a ratio of 10 parts of titanium oxide / 1 part of carbon black. The adhesive layer was formed by a reverse coating method using a chlorinated polypropylene resin-based ink. This multi-layer film for inserts is formed by first forming each of the above-mentioned layers by printing on one side of an acrylic film, pasting a protective film on the other side, drying at a temperature of 60 ° C., and then cooling to room temperature, Later thickness was 447 μm. The multilayer film for insert was once wound around a roll shaft to form a roll-shaped roll. The multilayer film for insert molding was unwound from the roll-shaped roll and inserted into a press die with a cutting blade. In the press die with a cutting blade, a concave portion having an inner surface in close contact with the cavity forming surface of the injection molding die was formed, and a vacuum suction hole was formed in the concave portion. The multilayer film for insert molding was vacuum-sucked into the concave portion and vacuum-molded into a three-dimensional shape of a molding for an automobile exterior part to obtain a three-dimensional multilayer film. The three-dimensional multilayer film was cut by a cutting blade of a press die, and cut off from the multilayer film for insert of a roll. The vacuum forming process was performed by vacuum forming with a vacuum suction force of 1.8 atm while heating the multilayer film to about 160 ° C with a heater at 280 ° C. Next, the protective film of the three-dimensional multilayer film was attached to the cavity of the insert mold so that the protective film was in close contact with the cavity forming surface. Next, a molding temperature of 200 ° C. is applied to a cavity formed by closing the fixed mold and the movable mold.
At 230 ° C. and a mold temperature of 40 ° C. to 60 ° C., injection molding is performed using a polypropylene resin as a molding resin. At the same time as molding the resin molded product, the molding resin is integrally bonded to the pattern layer side of the multilayer film, and the polypropylene resin molded product After cooling, the resin molded product was taken out of the mold, and the protective film and the low-adhesion layer were separated from the acrylic film and the printing layer.
A side mat guard having a silver acrylic film on the outermost surface was obtained.

[0028]

According to the method for producing an acrylic insert molded product of the present invention, at least an acrylic film releasable from the protective film and a pattern layer formed by printing are laminated on the protective film to a thickness of 200 μm to 1000 μm.
Process the required part of the μm multilayer film into a three-dimensional shape and cut it off, mount the three-dimensional multilayer film in the cavity of the insert molding die, close the mold, inject molding resin into the cavity, and mold the resin molded product At the same time, after the molding resin is integrally bonded to the picture layer side of the three-dimensional multilayer film, the resin molded product is taken out of the mold and the protective film is peeled off. Further, the acrylic insert molded product of the present invention is characterized in that an acrylic film having a pattern layer laminated by printing is integrally bonded to the surface of a three-dimensional resin molded product. In addition, the multilayer film for inserts of the present invention has a thickness of 50 μm or more, in which a pattern layer and an adhesive layer are formed on one side of an acrylic film having a thickness of 50 μm or more by printing and a protective film is laminated on the other side, and the thickness is 200 μm to 1000 μm. There is a feature.

According to the present invention, processing into a three-dimensional shape, separation of necessary parts, and insert molding can be performed in a state where the acrylic film of the multilayer film for insert is protected by the protective film. It is possible to avoid direct contact with the die surface of the mold, and further, the metal surface of the cavity forming surface of the insert molding die. For this reason, the acrylic film is not scratched due to traces or friction due to the fine unevenness on the mold surface, and fine unevenness or dust is not attached to the acrylic film due to picking up dust or dirt.

Further, in the present invention, since a unique multilayer film for insert molding which is reinforced with a protective film and has a thickness of 200 μm to 1000 μm is used, the yield and production efficiency of the finished product are improved for the following reasons.
That is, since the multilayer film for insert molding used in the present invention has a stiffness, it does not bend easily when inserted into a vacuum molding die, a cutting die, or an insert molding die, and is easily positioned in the die. For this reason, the positioning can be performed quickly, and a finished product free from misalignment of the pattern can be obtained. In addition, the multilayer film for insert molding used in the present invention provides a sense of weight and stability, so that a vacuum molding die, a cutting die,
Once positioned in the insert molding die, the film is less likely to be misaligned due to vibration of the die and the like.
For this reason, the positioning can be performed quickly, and a finished product free from misalignment of the pattern can be obtained. Further, since the multilayer film for insert molding used in the present invention is thick, the acrylic film is not inserted into the gap between the blades of the cutting die when cutting, and poor cutting of the film hardly occurs.
In addition, tearing and uneven stretching are less likely to occur during vacuum forming during three-dimensional processing. Therefore, it is possible to obtain a finished product having no broken or deformed patterns and no jagged edges of the film. In addition, since the multilayer film for insert molding used in the present invention has a shape retention property, when the acrylic film is processed into a three-dimensional shape and transferred to the cavity of the mold for insert molding, the acrylic film hardly collapses. For this reason, the acrylic film is easily transported, and is easily mounted in the cavity of the insert molding die.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one of the steps of the method for producing an acrylic insert molded product of the present invention.

FIG. 2 is a cross-sectional view showing one of the steps of the method for producing an acrylic insert molded product according to the present invention.

FIG. 3 is a cross-sectional view showing one of the steps of the method for producing an acrylic insert molded product of the present invention.

FIG. 4 is a cross-sectional view showing one of the steps of the method for producing an acrylic insert molded product of the present invention.

FIG. 5 is a cross-sectional view showing one of the steps of the method for producing an acrylic insert molded product of the present invention.

FIG. 6 is a cross-sectional view showing one of the steps of the method for producing an acrylic insert molded product according to the present invention.

FIG. 7 is a cross-sectional view showing one of the steps of producing the multilayer film for insert molding of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protective film 2 Acrylic film 3 Printing layer 4 Picture layer 5 Adhesive layer 6 Multilayer film 7 Press cutting device 8 Punching die 9 Cutting blade 10 Vacuum forming device 11 Vacuum suction hole 12 Convex part 13 Movable mold 14 Fixed mold 15 Cavity forming surface 16 Gate section 17 Molded resin 18 Resin molded article 19 Low adhesion layer 20 Three-dimensional multilayer film

Claims (3)

[Claims] An acrylic film releasable from a protective film and a pattern layer formed by printing are laminated on the protective film at a thickness of at least 200 μm to 100 μm.
The required part of the 0μm multilayer film is processed and cut into a three-dimensional shape, the three-dimensional multilayer film is mounted in the cavity of the insert molding die, the mold is closed, the molding resin is injected into the cavity, and the resin molded product is molded. At the same time, after integrally forming and adhering the molding resin to the picture layer side of the three-dimensional multilayer film, the resin molding is taken out of the mold, and the protective film is peeled off. 2. An acrylic insert molded product, wherein an acrylic film on which a picture layer is laminated by printing is integrally bonded to the surface of a three-dimensional resin molded product. 3. An acrylic film having a thickness of 50 μm or more, in which a picture layer and an adhesive layer are formed by printing on one surface and a protective film is laminated on the other surface, has a thickness of 20 μm.
A multilayer film for insert molding, having a thickness of 0 μm to 1000 μm.