JP4194672B2 - Acrylic insert molding and its manufacturing method, multilayer film for insert molding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an acrylic insert molded product for use in applications such as panels and instruments manufactured by vacuum forming processing, especially automotive interior parts, automotive exterior parts, etc. Related to film. Hereinafter, the method of inserting a film into a mold and integrally bonding with a molding resin is referred to as “insert molding”.
[0002]
[Prior art]
There are the following methods for producing a conventional acrylic insert molded article.
(1) An insert molding film made of an acrylic film having a thickness of about 150 μm printed with a pattern layer is processed into a three-dimensional shape using a vacuum mold, and then punched using a cutting die. And insert a three-dimensional acrylic film into the cavity of the mold for insert molding, close the mold and inject the molding resin into the cavity, and mold the resin on the pattern side of the acrylic film simultaneously with the molding of the resin molded product. There is a method of integrally bonding.
[0003]
(2) The required part is three-dimensionally processed by vacuum forming a multilayer film in which an acrylic film with a thickness of about 150 μm, a pattern layer, and a reinforcing sheet (adhesive to the molded resin) are laminated, and then the required part is separated by punching. The three-dimensional acrylic film is inserted into the cavity of the mold for insert molding, the mold is closed, the molding resin is injected into the cavity, and the molding resin is integrally bonded to the reinforcing sheet side of the multilayer film simultaneously with the molding of the resin molded product. There is a way.
[0004]
[Problems to be solved by the invention]
However, in (1), the yield and production efficiency of the finished product were poor.
That is, the conventional insert molding film is weak and easily deforms.
Therefore, when inserted into a vacuum forming die, a cutting die, or an insert molding die, it is bent immediately and is difficult to position within the die. For this reason, it took time for positioning, and it was easy to obtain a finished product in which the pattern was displaced.
Moreover, since the conventional film for insert molding is small in weight, there is no sense of stability. Therefore, even if the film is once positioned in the vacuum forming die, the cutting die or the insert forming die, the film is liable to be displaced due to the vibration of the die. For this reason, it took time for positioning, and it was easy to obtain a finished product in which the pattern was displaced.
Moreover, the conventional film for insert molding is thin. Therefore, when cutting, the acrylic film is likely to be sandwiched between the cutting blades and the gap between the blades, resulting in poor cutting of the acrylic film. In addition, tearing and unevenness of elongation were likely to occur during vacuum forming during three-dimensional processing. For this reason, it was easy to obtain a finished product with broken or deformed patterns and jagged edges of the film.
Moreover, the conventional insert molding film has a low form-retaining property. Therefore, even if the acrylic film could be processed into a three-dimensional shape, it was easy to lose its shape when 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 it in the cavity of the insert molding die.
[0005]
In (2), since the film for insert molding has a reinforcing sheet, it has a certain level of waist, weight, and shape retention, and although the problem as described in (1) is unlikely to occur, the original gloss and texture of the acrylic surface. It becomes easy to produce an insert-molded product in which the damage is impaired.
In other words, since acrylic film is a delicate material, pressing it directly against the metal surface of the cavity forming surface of a vacuum mold or cutting mold, or the mold for insert molding, presses the fine irregularities on the mold surface. This is because traces or scratches are caused by friction or friction, and fine irregularities or dust are attached to the acrylic film by picking up dust or dirt.
[0006]
The present invention solves the above-mentioned drawbacks, and provides an acrylic insert molded product manufacturing method, an acrylic insert molded product, and a multilayer film for insert molding that does not cause misalignment during insertion of an acrylic film into a vacuum mold or the like. With the goal.
[0007]
In order to achieve the above object, the method for manufacturing an insert-molded product of the present invention has a thickness of 200 μm to 1000 μm, on which a protective film is laminated with at least an acrylic film peelable from the protective film and a pattern layer formed by printing. The required part of the 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, and the molding resin is injected into the cavity. At the same time, after the molding resin is integrally bonded to the pattern layer side of the three-dimensional multilayer film, the resin molded product is taken out from the mold and the protective film is peeled off. In order to achieve the above object, the multilayer film for insert molding according to the present invention forms a pattern layer and an adhesive layer by printing on one side of an acrylic film having a thickness of 50 μm or more, and on the other side. Peeled after being removed from the mold The thickness of the multilayer film on which the protective film is bonded is 200 μm to 1000 μm Used in the manufacturing method of the above-mentioned acrylic insert molded product Is.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below.
The method for producing an acrylic insert-molded article according to the present invention comprises a protective film on which a necessary part of a multilayer film having a thickness of 200 μm to 1000 μm in which an acrylic film that can be peeled off from the protective film and a pattern layer formed by printing is laminated is provided. Process and cut into a 3D shape, attach the 3D multilayer film to the cavity of the mold for insert molding, close the mold, and inject the molding resin into the cavity. After the molding resin is integrally bonded to the layer side, the resin molded product is taken out from the mold and the protective film is peeled off.
[0009]
First, the multilayer film 6 for insert molding that 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 bonded to the other side, and has a thickness of 200 μm to 1000 μm.
[0010]
The acrylic film 2 is a film that 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 described later and can be peeled off from the protective film 1 described later. The acrylic film 2 preferably has a thickness of 50 μm or more. This value is effective because the acrylic film alone can be used as printing paper and the printing layer 3 such as the picture layer 4 and the adhesive layer 5 can be directly formed on the acrylic film 2 by a rotary printing machine. That is, according to the rotary printing press, the tensioned acrylic film 2 is unwound from the roll and wound on another roll. Printing is performed on the acrylic film 2 between unwinding and winding, and an insert film is created through drying and cooling of the printed layer. If the acrylic film 2 is smaller than 50 μm, the tension tends to cause unnecessary stretching, heat wrinkles, misregistration, and cutting due to the tension.
[0011]
The acrylic film 2 has, for example, a thickness of 30 to 80 μm composed of 80 to 90 parts by weight of polymethyl methacrylate, 20 to 5 parts by weight of polybutyl acrylate, and 0 to 5 parts by weight of additives (such as an ultraviolet absorber). is there. Or there exists a thing of 50-100 micrometers in thickness which consists of 50-80 weight part of polymethylmethacrylate, 15-50 weight part of polybutylacrylate, and 0-5 weight part of additives (ultraviolet absorber etc.).
[0012]
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 this case, a film made of a resin mixed with an ultraviolet absorber may be used. 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. The acrylic film 2 may be 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 friction strength of the acrylic film after peeling off the protective film 1. The overcoat layer or the overcoat film may be a hard coat layer or a hard coat film. In addition, the acrylic film 2 is provided with a plasticizer protective layer and a plasticizer 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. Sometimes it forms. These overcoat layer and overcoat film, or the plasticizer protective layer and the plasticizer protective film may have a low adhesion function. The acrylic film 2 may be laminated by a laminating method or the like via a protective film 1 and a low adhesion layer 19 described later (see FIG. 7). After lamination, the acrylic film 2 may be perforated.
[0013]
The pattern layer 4 is formed on the entire surface or part of the surface of the acrylic film 2 by printing. The pattern layer 4 is used to represent characters, figures, symbols, etc. on the surface of the insert molded product, or to represent a colored surface. In addition, it can also represent a character, a figure, a symbol, etc. or a colored surface by the metal vapor deposition layer which consists of a vapor deposition film. The pattern layer 4 includes 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. In the multilayer film used in the present invention, for example, an adhesive layer is formed by printing in addition to the pattern layer. Thus, when the layer formed by printing is named generically, it is hereafter called a printing layer. The adhesive layer is a layer for improving adhesiveness with 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. The adhesive layer 5 is effective because it is formed by printing ink and is less expensive than using a thick adhesive sheet.
[0014]
The protective film 1 is a film that does not easily expand and contract by heat, and has a thickness such that a multilayer film 6 having a thickness of 200 μm to 1000 μm is formed in a state where the pattern layer 4 is attached to the acrylic film 2 on which the printing is formed. Is. When the thickness of the multilayer film 6 is smaller than 200 μm, moderate deformability that is not too obvious, stability that does not shift due to vibration, etc., shape retention that does not easily deform due to weak external force after being processed into a three-dimensional shape It becomes difficult to have. This is because if the thickness of the multilayer film 6 is larger than 1000 μm, bulging occurs when the long multilayer film 6 is wound into a roll shape, so that it is necessary to suppress the amount of winding. When the thickness of the protective film 1 is particularly 500 μm or less, the amount of winding is not too small, which is effective.
[0015]
The protective film 1 is, for example, a 20 to 1000 μm polyvinyl chloride film, an amorphous or low-crystalline polyester film, an amorphous or low-crystalline polypropylene film, a polybutylene terephthalate film, an unstretched or low-stretchable film. There are ethylene vinyl alcohol film, heat-resistant polyethylene film and the like.
[0016]
The protective film 1 may be subjected to a low adhesion treatment so as to be peelable from the acrylic film 2. The protective film treated with low adhesion is, for example, a protective film using a mixture of a rosin-based, tempel-based, petroleum-based or other tackifying resin and a polyolefin, polystyrene, or other hot-melt resin. Some of them are made of a low-viscosity resin. The low adhesion treatment may be performed by forming the low adhesion layer 19. The low adhesion layer 19 includes a method of forming an adhesive made of a hot melt resin such as natural rubber, synthetic rubber, silicone or acrylic on the protective film by reverse coating, roll coating, gravure printing or the like. By the low adhesion treatment, the protective film and the acrylic film are adhered to each other at the time of three-dimensional processing described later. However, when the protective film is turned by hand, it can be easily peeled off. For example, there is a peel strength of 0.01 to 0.5 kg weight per 1 cm width. The protective film 1 and the acrylic film 2 may be peelable over the entire surface, or may be partially peelable.
[0017]
Hereafter, the manufacturing method of the acrylic insert molded article of this invention using the said multilayer film is demonstrated.
[0018]
First, a necessary part of a multilayer film 6 having a thickness of 200 μm to 1000 μm having an acrylic film 2 and a pattern layer 4 that can be peeled off from the protective film 1 is processed into a three-dimensional shape on the protective film 1, and then separated. (See FIG. 1). The multilayer film 6 may be once wound around a roll shaft and continuously inserted into a vacuum forming apparatus 10 or a press cutting apparatus 7 described later as a roll-shaped roll. Or you may insert continuously in the vacuum forming apparatus 10 and the press cutting apparatus 7 which are mentioned later as the sheet-like multilayer film 6 of a predetermined | prescribed magnitude | size.
[0019]
In order to process the multilayer film 6 into a three-dimensional shape, for example, a means for forming a normal plastic sheet into a desired three-dimensional shape such as a vacuum forming apparatus 10 or a press forming apparatus may be used. The mold used in the vacuum molding apparatus 10 or the press molding apparatus has a recess having exactly the same shape as the cavity forming surface 15 of the mold for insert molding for molding a resin molded product 18 having a desired three-dimensional shape to be described later. There is a type in which the multilayer sheet is in close contact with the inner surface of the recess. Alternatively, there is a type in which the convex portion 12 is a copy of the cavity forming surface 15 of the mold for insert molding, and the multilayer film 6 is in close contact with the outer surface of the convex portion. In the latter type, the printing layer 3 is interposed between the acrylic film 2 and the convex portion 12. The vacuum forming apparatus 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.
[0020]
The multilayer film 6 is separated by a press cutting device 7 comprising a punching die having a knife or cutting blade 9, a sliding cutting die, or a heat cutting device, a laser cutting device, a Thomson punching device, a Heisel punching device, a ponce punching device, etc. Ordinary plastic sheet cutting means may be used. Due to the separation, the shape of the necessary part of the multilayer film 6 becomes a shape that does not protrude from the cavity forming surface 15 of the mold for insert molding for molding a resin molded product 18 having a desired three-dimensional shape to be described later. Or the shape of the required part of the multilayer film 6 has a shape which does not protrude at least from the periphery of the resin molded product 18 having a desired three-dimensional shape obtained by an insert molding die described later.
[0021]
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 can also be performed simultaneously by using a press die with a cutting blade (FIG. 1). reference).
[0022]
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. Simultaneously with the molding of the resin molded product 18, the pattern layer 4 of the three-dimensional multilayer film 20. After the molding resin 17 is integrally bonded to the side, the resin molded product 18 is taken out from the mold, and the protective film 1 is peeled off (FIGS. 2 to 6).
[0023]
Examples of insert molds include injection molds and compression molds. The mold for insert molding includes a fixed mold 14 having a gate portion 16 for injecting a molding resin 17 and a movable mold 13. The fixed mold 14 and the movable mold 13 are closed so that the fixed mold 14 and the movable mold 13 are movable. In some cases, one or a plurality of cavities surrounded by the cavity forming surface 15 of the mold 13 are formed. The cavity may form a hole in the resin molded product 18. The cavity forming surface 15 on which the three-dimensional multilayer film 20 is mounted may be formed on either the fixed mold 14 or the movable mold 13. The multilayer film 6 may be inserted so that the printed layer side faces the cavity forming surface 15 of the fixed mold 14 or inserted so that the printed 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 apparatus 10 or the press cutting apparatus 7 to the insert molding die may be performed automatically by holding the three-dimensional multilayer film 20 with a robot or manually. (See FIG. 2).
The three-dimensional multilayer film 20 may be fixed by suction from the cavity forming surface 15 of the injection mold.
[0024]
Examples of the molding resin 17 include resins such as polypropylene resin, acrylonitrile butadiene styrene resin, polystyrene resin, ethylene vinyl acetate resin, polycarbonate resin, and nylon resin. When the 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.
After the resin molded product 18 is cooled, the mold is opened, and an acrylic insert molded product in which the acrylic film 2 on which the pattern 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 for the multilayer film for inserts, an amorphous polyethylene terephthalate film having a thickness of 200 μm subjected to low adhesion treatment with urethane resin was used. As the acrylic film, HBS006 (HBC ZERO ZEROLOCK) manufactured by Mitsubishi Rayon Co., Ltd. having a thickness of 200 μm was used. As the printing layer, a glitter pigment layer and an adhesive layer were laminated. The metal vapor deposition layer was laminated | stacked with the chromium vapor deposition film of thickness 400mm between the acrylic film and the glitter pigment layer. The glitter pigment layer was formed by gravure printing using an acrylic resin ink containing an aluminum pigment. The adhesive layer was formed by a gravure printing method using chlorinated polypropylene resin-based ink. This multilayer film for inserts is formed by first forming each layer by printing on one side of an acrylic film, bonding a protective film on the other side, drying at a temperature of 60 ° C., and cooling to room temperature. The later thickness was 412 μm. This multilayer film for inserts was once wound around a roll shaft to obtain a roll-shaped roll. The multilayer film for insert molding was unwound from this roll-shaped roll and inserted into a press die with a cutting blade. The press die with a cutting blade was formed with a recess having an inner surface in close contact with the cavity forming surface of the injection mold, and a vacuum suction hole was formed in the recess. The multilayer film for insert molding was vacuum-sucked into the recesses and vacuum molded into the three-dimensional shape of the molding for automobile exterior parts to obtain a three-dimensional multilayer film. The three-dimensional multilayer film was cut with a cutting blade of a press die and cut from the multilayer film for inserts in a roll-shaped roll. The vacuum forming process was performed by vacuum forming with a vacuum suction force of 15 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 molding die so that the protective film was in close contact with the cavity forming surface. Next, in a cavity formed by closing the fixed mold and the movable mold, injection molding is performed using polypropylene resin as a molding resin at a molding temperature of 200 ° C. to 220 ° C. and a mold temperature of 40 ° C. to 60 ° C. At the same time as molding, the molded resin is integrally bonded to the pattern layer side of the multilayer film, and after cooling the polypropylene resin molded product, the resin molded product is taken out from the mold, and the protective film and the low-adhesion layer, the acrylic film and the printing layer And peeling. A 15 mm thick molding having a metallic acrylic film on the outermost surface was obtained.
[0026]
Example 2
A wood grain console for automobile interior parts was manufactured under the following conditions.
As the protective film for the multilayer film for insert, a heat-resistant polyethylene film having a thickness of 75 μm subjected to low adhesion treatment with urethane resin was used. As the acrylic film, HBS006 (HBC ZERO ZEROLOCK) manufactured by Mitsubishi Rayon Co., Ltd. having a thickness of 200 μm was used. The printing layer is composed of a wood grain conduit pattern layer, a wood grain base layer, and an adhesive layer. The wood grain conduit pattern layer was formed by a gravure printing method using an acrylic resin-based ink containing carbon black. The wood grain underlayer was formed by screen printing using an acrylic resin-based ink containing bengara. The adhesive layer was formed by screen printing using vinyl resin ink. This multilayer film for inserts is formed by first forming each layer by printing on one side of an acrylic film, bonding a protective film on the other side, drying at a temperature of 70 ° C., and cooling to room temperature. The later thickness was 293 μm. This multilayer film for inserts was once wound around a roll shaft to obtain a roll-shaped roll. The multilayer film for insert molding was unwound from this roll-shaped roll and inserted into a press die with a cutting blade. The press die with a cutting blade was formed with a recess having an inner surface in close contact with the cavity forming surface of the injection mold, and a vacuum suction hole was formed in the recess. The multilayer film for insert molding was vacuum-sucked into the recesses, and vacuum-formed into a three-dimensional shape of a consolor for automobile interior parts to obtain a three-dimensional multilayer film. The three-dimensional multilayer film was cut with a cutting blade of a press die and cut from the multilayer film for inserts in a roll-shaped roll. The vacuum forming process was performed by vacuum forming with a vacuum suction force of 1.2 atm while heating the multilayer film to about 140 degrees with a heater at 250 ° C. The molding processing time was about 5 seconds. Next, the protective film of the three-dimensional multilayer film was attached to the cavity of the insert molding die so that the protective film was in close contact with the cavity forming surface. Next, in a cavity formed by closing the fixed mold and the movable mold, injection molding is performed using polypropylene resin as a molding resin at a molding temperature of 200 ° C. to 220 ° C. and a mold temperature of 40 ° C. to 60 ° C. At the same time as molding, the molded resin is integrally bonded to the pattern layer side of the multilayer film, and after cooling the polypropylene resin molded product, the resin molded product is taken out from the mold, and the protective film and the low-adhesion layer, the acrylic film and the printing layer And peeling. An 8 mm thick consola with a wood grain acrylic film on the outermost surface was obtained.
[0027]
Example 3
A silver side mat guard was manufactured under the following conditions.
As the protective film for the multilayer film for inserts, a vinyl chloride film having a thickness of 200 μm subjected to low adhesion treatment with urethane resin was used. As the acrylic film, HBS006 (HBC ZERO ZEROLOCK) manufactured by Mitsubishi Rayon Co., Ltd. having a thickness of 200 μm was used. The printing layer includes a glitter pigment layer, a base pigment layer, and an adhesive layer. The glitter pigment layer was formed by reverse coating using urethane resin ink containing aluminum pigment. The base pigment layer was formed by a reverse coating method using an ink obtained by mixing gray urethane resin at a ratio of 10 parts of titanium oxide / 1 part of carbon black. The adhesive layer was formed by reverse coating using chlorinated polypropylene resin-based ink. This multilayer film for inserts is formed by first forming each layer by printing on one side of an acrylic film, bonding a protective film on the other side, drying at a temperature of 60 ° C., and cooling to room temperature. The later thickness was 447 μm. This multilayer film for inserts was once wound around a roll shaft to obtain a roll-shaped roll. The multilayer film for insert molding was unwound from this roll-shaped roll and inserted into a press die with a cutting blade. The press die with a cutting blade was formed with a recess having an inner surface in close contact with the cavity forming surface of the injection mold, and a vacuum suction hole was formed in the recess. The multilayer film for insert molding was vacuum-sucked into the recesses and vacuum molded into the three-dimensional shape of the molding for automobile exterior parts to obtain a three-dimensional multilayer film. The three-dimensional multilayer film was cut with a cutting blade of a press die and cut from the multilayer film for inserts in a roll-shaped 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 molding die so that the protective film was in close contact with the cavity forming surface. Next, in a cavity formed by closing the fixed mold and the movable mold, injection molding is performed using a polypropylene resin as a molding resin at a molding temperature of 200 ° C to 230 ° C and a mold temperature of 40 ° C to 60 ° C. At the same time as molding, the molded resin is integrally bonded to the pattern layer side of the multilayer film, and after cooling the polypropylene resin molded product, the resin molded product is taken out from the mold, and the protective film and the low-adhesion layer, the acrylic film and the printing layer And peeling. A side mat guard having a silver acrylic film on the outermost surface was obtained.
[0028]
【The invention's effect】
According to the method for producing an acrylic insert molded article of the present invention, at least a necessary part of a multilayer film having a thickness of 200 μm to 1000 μm in which an acrylic film that can be peeled off from the protective film and a pattern layer formed by printing is laminated on the protective film is provided. Process and cut into a 3D shape, attach the 3D multilayer film to the cavity of the mold for insert molding, close the mold, and inject the molding resin into the cavity. After the molding resin is integrally bonded to the layer side, the resin molded product is taken out from the mold and the protective film is peeled off.
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.
The multilayer film for inserts of the present invention has a thickness of 200 μm to 1000 μm, in which a pattern 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 bonded to the other side. It is characterized by being.
[0029]
In this invention, since the acrylic film of the insert multilayer film is protected by the protective film, it can be processed into a three-dimensional shape, a necessary part can be cut off, and insert molding can be performed. It is possible to avoid direct contact with the metal surface of the surface and further the cavity forming surface of the insert molding die. For this reason, scratches are not caused by traces or friction due to fine irregularities on the mold surface, or fine irregularities or dust are not attached to the acrylic film by picking up dust or dirt.
[0030]
Moreover, in this invention, since the intrinsic | native multilayer film for insert molding which is reinforced with a protective film and is 200 micrometers-1000 micrometers is used, the yield and production efficiency of a finished product become good for the following reasons.
That is, since the multilayer film for insert molding used in the present invention brings a waist, it is not easily bent when inserted into a vacuum mold, a cutting mold, or an insert mold, and is easily positioned in the mold. For this reason, positioning can be performed quickly, and a finished product with no pattern displacement can be obtained.
In addition, since the multilayer film for insert molding used in the present invention gives a sense of weight and stability, after positioning once in a vacuum mold, a cutting mold, and an insert mold, the film is caused by vibration of the mold. The positional deviation of For this reason, positioning can be performed quickly, and a finished product with no pattern displacement can be obtained.
Further, since the multilayer film for insert molding used in the present invention is thick, an acrylic film is not sandwiched between the blades of the cutting die and the gap between the blades when cutting, and it is difficult for cutting failure of the film to occur. In addition, tearing and elongation unevenness hardly occur during vacuum forming during three-dimensional processing. For this reason, the finished product which does not have a jagged edge at the edge of the film is obtained.
In addition, since the multi-layer film for insert molding used in the present invention provides shape retention, it is difficult to lose its shape when the acrylic film is processed into a three-dimensional shape and transferred to the cavity of the insert molding die. For this reason, it is easy to transport the acrylic film, and it is easy to mount it in the cavity of the insert molding die.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one step of a method for producing an acrylic insert molded article according to the present invention.
FIG. 2 is a cross-sectional view showing one step of a method for producing an acrylic insert molded article according to the present invention.
FIG. 3 is a cross-sectional view showing one step in a method for producing an acrylic insert molded article according to the present invention.
FIG. 4 is a cross-sectional view showing one step in a method for producing an acrylic insert molded article according to the present invention.
FIG. 5 is a cross-sectional view showing one step in a method for producing an acrylic insert molded article according to the present invention.
FIG. 6 is a cross-sectional view showing one step in a method for producing an acrylic insert molded article according to the present invention.
FIG. 7 is a cross-sectional view showing one of the manufacturing steps of the multilayer film for insert molding of the present invention.
[Explanation of symbols]
1 Protective film
2 Acrylic film
3 Print layer
4 pattern layers
5 Adhesive layer
6 Multi-layer film
7 Press cutting device
8 Punching mold
9 Cutting blade
10 Vacuum forming equipment
11 Vacuum suction hole
12 Convex
13 Movable type
14 Fixed type
15 Cavity forming surface
16 Gate part
17 Molding resin
18 resin molded products
19 Low adhesion layer
20 Three-dimensional multilayer film

Claims (2)

  A required part of a multilayer film having a thickness of 200 μm to 1000 μm in which an acrylic film that can be peeled off from the protective film and a pattern layer formed by printing is laminated on the protective film is processed into a three-dimensional shape and separated into a three-dimensional multilayer. After mounting the film in the cavity of the mold for insert molding, closing the mold and injecting the molding resin into the cavity, after molding the resin molded product and integrally bonding the molding resin to the pattern layer side of the 3D multilayer film A method for producing an acrylic insert molded product, wherein the resin molded product is taken out of the mold and the protective film is peeled off. The thickness of the multilayer film in which a picture 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 that is peeled off after being removed from the mold on the other side is 200 μm to 1000 μm. The multilayer film for insert molding used in the method for producing an acrylic insert molded article according to claim 1 .

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