JP2005001215A - Method for manufacturing injection-molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an injection-molded product developing no weld on its surface and usable in a part making great account of a design effect. <P>SOLUTION: This injection-molded product 70 is constituted so as to integrally attach a skin film 50 to the surface thereof and is manufactured by a skin film placing process for placing the skin film 50 on one of the movable mold 20 and the fixed mold 10 constituting the mold of a multipoint injection molding machine 1, a first filling process, a second filling process and a process for opening the mold after the second filling process to take out the injection-molded product 70 from a cavity 40. In the first filling process, a molten resin is injected in the cavity 40 of the mold from the first injection gate 17 provided to the other one of the fixed mold 10 and the movable mold 20 to fill the cavity 40 so as to leave at least a part of the cavity 40 and solidified. In the second filling process, the molten resin is injected in the remainder of the cavity 40 from the second injection gate 18 provided to the same other mold as the first injection gate 17 after the first filling process and solidified. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an injection molded product. In particular, the present invention relates to a method for manufacturing an injection molded product, in which a resin part that is visible in the interior of a vehicle such as an automobile is manufactured by a multipoint injection molding machine.
In this specification, the “multi-point injection molding machine” has a plurality of injection gates for injecting molten resin into a cavity of a mold composed of a movable mold and a fixed mold, and injects by injection with a time difference in order. A molding machine that can manufacture products.
[0002]
[Prior art]
Resin parts installed in vehicles such as automobiles are usually manufactured by an injection molding machine because they are easy to mold. However, when injection molding is performed with a single injection gate, a large force is required as a so-called “clamping force” of the injection molding machine, so that the injection molding machine becomes large. For this reason, the production cost of the injection molding machine is also expensive, and the cost of the injection molded product manufactured by the expensive molding machine is inevitably high.
For this reason, recently, in order to reduce the size of an injection molding machine, it has been proposed to manufacture resin parts by a multi-point injection molding method (see Patent Document 1). According to the multi-point injection molding machine, injection of molten resin into the cavity in the molding die is performed in multiple times with a time difference, so a small force is sufficient as a so-called “clamping force”. Can be realized. As a result, the production cost of the injection molding machine is reduced, and the cost of the injection molded product is also reduced.
[0003]
[Patent Document 1]
JP 2002-355866 A [0004]
[Problems to be solved by the invention]
However, in the injection molding using the above-described conventional multi-point injection molding machine, since the injection of the molten resin is performed a plurality of times at different times, the flow tip portion by the first injection of the molten resin and the subsequent molten resin are injected. The flow front part by injection contacts in the cavity.
For this reason, a weld line or a flow line is generated in the contact portion, and remains as a line or a streak in the molded product. That is, the molded product has a poor appearance.
Therefore, it cannot be used as a component that places importance on the design effect, and as a result, the range of use of the molded product is narrow. For example, it has been considered unsuitable as an interior resin part that can be seen inside a vehicle such as an automobile.
In addition, although there was no problem in terms of quality, the use was avoided as a result of the fear that the viewer may feel uneasy about its safety.
[0005]
The present invention was devised in view of the above points, and the problem to be solved by the present invention is that a so-called weld line can be seen even when a molded product is manufactured by a multi-point injection molding machine. The purpose is to obtain a lost injection molded product.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the method for manufacturing an injection-molded article according to the first invention of the present invention takes the following means.
That is, the method for manufacturing an injection molded product according to the first invention is a method for manufacturing an injection molded product in which a part is manufactured by a multi-point injection molding machine in manufacturing a part that is visually visible. A skin film placing step for placing a skin film on one of a movable mold and a stationary mold constituting the molding die of the molding machine, and the other mold of the fixed mold and the movable mold in the cavity in the molding mold The first filling step in which molten resin is injected from the provided first injection gate and filled and solidified leaving at least a part of the cavity, and after the first filling step, the same as the injection first gate in the remaining cavity A second filling step of injecting molten resin from an injection second gate provided in the other mold and filling and solidifying; and a step of opening the mold and taking out the molded product in the cavity after the second filling step. Skin film on the surface Characterized by producing the body to mount the molded article.
According to the first aspect of the invention, the skin film is placed on the surface of the molded product by placing the skin film in the cavity of the mold and guiding the molten resin into the cavity. For this reason, the weld produced by the filling and solidification in the first filling step and the second filling step does not appear on the surface of the molded product, and the injection molded product can be used in a portion where the design effect is important. The range of use can be expanded. In addition, there is no fear of unnecessary anxiety for the viewer.
[0007]
Next, the method for manufacturing an injection molded product according to the second invention of the present invention takes the following means.
That is, the method for manufacturing an injection-molded article according to the second invention is the method for manufacturing an injection-molded article according to the first invention, wherein the skin film is a fixed mold and a movable mold after the skin film placing step. It has the extending process extended along the surface of one type | mold. It is characterized by the above-mentioned.
According to the second invention, in addition to the function according to the first invention described above, the following function is provided. That is, according to the second invention, it is possible to produce a molded article with a high design effect that makes the appearance of the skin film better by extending the skin film to the mold surface.
[0008]
Next, the method for manufacturing an injection molded product according to the third aspect of the present invention takes the following means.
That is, the method for manufacturing an injection molded product according to the third invention is the method for manufacturing the injection molded product according to the second invention, wherein the extending step of extending the skin film is a vacuum suction for sucking the skin film. One of the molds has a hole, and the skin film is sucked through the vacuum suction hole so that the skin film extends to the mold surface.
According to the third invention, in addition to the function according to the second invention described above, the following function is provided. That is, in the third invention, the skin film is sucked through the vacuum suction holes and is extended to the mold surface, so that the skin film is not wrinkled or twisted, and a molded product having a high design effect can be manufactured.
[0009]
Next, the method for manufacturing an injection molded product according to the fourth aspect of the present invention takes the following means.
That is, the method for manufacturing an injection-molded product according to the fourth invention is the method for manufacturing an injection-molded product according to the second invention, wherein the extending step of extending the skin film presses the skin film against one mold surface. A gas injection hole for pressing is provided in the other mold, and the skin film is extended to the mold surface by pressing the skin film with the gas from the gas injection hole.
According to the fourth invention, in addition to the function according to the second invention described above, the following function is provided. That is, the fourth invention presses the skin film with the gas from the gas injection holes and extends it to the mold surface, so that the skin film is not wrinkled or twisted, and a molded product with a high design effect can be manufactured. .
[0010]
Next, the method for manufacturing an injection molded product according to the fifth aspect of the present invention takes the following means.
That is, the method for manufacturing an injection molded product according to the fifth aspect of the invention is a method for manufacturing an injection molded product in which a part is manufactured by a multi-point injection molding machine in manufacturing a part that is visually visible. A preliminary process for forming a skin film of a predetermined shape by an appropriate molding apparatus outside the molding machine, and a skin formed by the preliminary process on one of a movable mold and a fixed mold constituting a molding die of a multi-point injection molding machine A step of fitting a film, and a molten resin is injected from a first injection gate provided in the other mold of the fixed mold and the movable mold into a cavity in the mold, and at least a part of the cavity is left to be filled and solidified A second filling step of injecting a molten resin from an injection second gate provided on the other mold same as the injection first gate into the remaining cavity after the first filling step, and filling and solidifying; Second charge After the step, characterized in that to produce a molded article attached integrally with the step of removing the molded article in the cavity by opening the mold, the skin film to the surface.
According to the fifth aspect of the invention, since the skin film is separately molded by an appropriate molding device outside the multipoint injection molding machine, the degree of freedom for preforming the skin film into a predetermined shape is increased. In addition, forming the skin film separately outside the multi-point injection molding machine in this way requires only considering the filling and solidification of the molten resin in the multi-point injection molding machine. It can be set as a simple structure. That is, a conventional ordinary multi-point injection molding machine can also be used. Furthermore, since the skin film molded into a predetermined shape can be confirmed when appropriately transferred from the molding apparatus to the multi-point injection molding machine, it is easy to find defective skin film products.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a method for manufacturing an injection molded product according to the present invention will be described below.
First, a first embodiment will be described with reference to FIGS. 1 and 3 to 6. In the first embodiment, the extending process for extending the so-called skin film is the case of the embodiment of the third invention. FIG. 1 is a cross-sectional view of an essential part of a multi-point injection molding machine according to this embodiment. 3 to 5 are cross-sectional views showing respective steps of the method of manufacturing an injection molded product. FIG. 6 shows an injection molded product manufactured by the manufacturing method of this embodiment.
[0012]
First, the configuration of the multipoint injection molding machine will be described with reference to FIG. The molding die of the multipoint injection molding machine 1 includes a fixed die 10 and a movable die 20. The mold is provided with a mold clamping device (not shown) for moving the movable mold 20 and clamping the mold at a high pressure. Then, the movable mold 20 is moved in the closing direction with respect to the fixed mold 10 so that the molding mold is closed, and the cavity 40 into which the molten resin is injected is formed (see FIG. 3). In the present embodiment, the mold surface of the movable mold 20 is a concave mold surface and is formed in a shape corresponding to the outer shape of the molded product. Further, the mold surface of the fixed mold 10 is formed as a convex surface. Therefore, in the present embodiment, one mold referred to in the present invention is the movable mold 20 and the other mold is the fixed mold 10.
[0013]
The fixed mold 10 which is the other mold is provided with a first injection device 11 and a second injection device 12 for injecting molten resin. The first injection device 11 connects the hopper 13 connected to a device (not shown) for supplying a molten resin (not shown), the injection first gate 17 opened in the cavity 40, and the two 13, 17 to fix them. It consists of a sprue 15 that penetrates the mold 10. The second injection device 12 has the same configuration as the first injection device 11. That is, the hopper 14 connected to an apparatus (not shown) for supplying a molten resin (not shown), the injection second gate 18 opened in the cavity 40, and the two 14, 18 are connected to penetrate the fixed mold 10. It consists of sprue 16.
[0014]
In the first and second injection devices 11 and 12, the molten resin supplied into the hoppers 13 and 14 is injected into the cavity 40 from the injection first and second gates 17 and 18 through the sprues 15 and 16, respectively. . The injection from the first and second gates 17 and 18 into the cavity 40 is performed with a so-called time difference. Injection into the cavity 40 is performed by the first injection device 11, and after the injected molten resin is solidified into a predetermined state, the injection is performed into the cavity 40 by the second injection device 12. Yes. In the present embodiment, the first injection device 11 is used as the first filling step referred to in the present invention, and the second injection device 12 is used as the second filling step referred to in the present invention.
The movable mold 20 whose mold surface is formed corresponding to the outer shape of the molded product is provided with a vacuum suction hole 21. An appropriate number of vacuum suction holes 21 are set according to the required suction capacity. The vacuum suction hole 21 serves to suck the gas in the cavity formed in the mold through this hole to make a vacuum state.
[0015]
Next, each process of the manufacturing method of this Embodiment using the multipoint injection molding machine 1 which consists of the above structure is demonstrated.
First, the extending process for extending the skin film 50 to the movable mold 20 will be described. As shown in FIG. 1, the skin film 50 is placed on the mold surface of the movable mold 20 with the movable mold 20 opened relative to the fixed mold 10. This placement is performed with the surface side of the skin film 50 facing the mold surface of the movable mold 20. This mounting state is a state in which the skin film 50 is indicated by an imaginary line. In this state, the gas (usually air) in the cavity 40 is sucked through the vacuum suction hole 21 provided in the movable mold 20. Thereby, the gas between the skin film 50 and the mold surface of the movable mold 20 is sucked and gradually becomes a vacuum state. Along with this, the skin film 50 also follows and deforms along the concave surface of the movable mold 20, and finally becomes in a state of extending in close contact with the concave surface. This state is a state in which the skin film 50 is indicated by a solid line. In the close contact state, the skin film 50 is in close contact with no wrinkles or twists.
[0016]
In addition, the skin film 50 should just be a thing in which the weld line which arises in the process mentioned later is hidden. For example, it is a decorative film, an insert film, a transfer film, etc., and the decorative layer of the skin film preferably has a design effect such as woodgrain or aluminum.
The skin film 50 can be supplied one by one, but the skin film is unwound from an unwinding roll installed separately from the injection molding machine and continuously supplied between the fixed mold 10 and the movable mold 20. You can also
[0017]
Next, the first filling process will be described. This first filling step is performed after the step of closely extending the skin film 50 to the mold surface of the movable mold 20. After the above process, the movable mold 20 is moved in the closing direction with respect to the fixed mold 10 and closed, and the mold is clamped by the mold clamping device.
In the clamped state, as shown in FIG. 3, the molten resin 100 is injected from the injection first gate 17 of the first injection device 11 into the cavity 40. The injection of the molten resin 100 is filled while leaving a part of the cavity 40 in a clamped state. FIG. 5 shows a state in which the state of FIG. 4 is left partially filled. Since filling in the first filling step leaves unfilled portions in the cavity 40, so-called mold clamping force is not so necessary. After the filling, the molten resin 100 is cooled and solidified to a predetermined hardness, and this step is finished.
The amount to be filled in the first filling step may be appropriately determined according to the size, shape, etc. of the molded product, but is preferably 2/3 or more of the whole.
The molten resin is filled in the first filling step so that the injection second gate 18 of the second injection device 12 exists at the unfilled portion in the first filling step.
[0018]
Next, the second filling step will be described. This second filling step is performed after the first filling step.
The molten resin 110 is injected and filled into the cavity 40 from the injection first gate 17 of the second injection device 12 into the remaining portion of the cavity 40 in the first filling step. This state is shown in FIGS. In the filling in the second filling step, the filling amount is reduced by the amount filled in the first filling step with respect to the whole amount, so that the mold clamping force is greatly reduced as compared with the whole amount. The tightening force is enough. For this reason, it can be performed by a relatively small multi-point injection molding machine.
When the molten resin 110 is filled in the second filling step, a so-called weld line 71 is formed at the contact point with the molten resin 100 in the first filling step, as shown in FIG. However, the weld line 71 is hidden from the surface by the skin film 50.
The molten resin filled in the second filling step is cooled and solidified to a predetermined hardness, and this step is completed. In the state where the second filling step is completed, there is an injection molded product in which the skin film is integrally attached to the surface in the mold.
[0019]
As the molten resins 100 and 110 injected and filled into the cavity 40 in the first filling step and the second filling step, polystyrene, polyethylene, polypropylene, polyamide, polyacetal, a synthetic resin copolymerized mainly with styrene and acrylonitrile. (AS resin), synthetic resin (ABS resin) copolymerized with styrene, acrylonitrile and butadiene as main components.
[0020]
Next, the process of taking out the molded product will be described. In this step, the injection molded product molded in the mold is taken out from the mold until the second filling step.
After completion of the second filling step, the mold clamping device is released, and the movable mold 20 is moved in the opening direction with respect to the fixed mold 10 so as to be opened. In this state, the injection-molded product 70 is ejected from the mold surface of the movable mold 20 by a known ejection mechanism (not shown), and is taken out from the molding mold manually or by a general-purpose automatic device. The extracted injection molded product 70 is shown in FIG. The injection-molded product 70 has a substantially U-shaped cross section, and the skin film 50 is integrally attached to the surface of the lower surface as seen in FIG. Therefore, the weld line 71 generated by so-called time difference filling between the first filling step and the second filling step is concealed by the skin film 50 and is not visible from the outside.
[0021]
Next, a second embodiment will be described with reference to FIG. This second embodiment is an example in the case where the extending process for extending a so-called skin film is the embodiment of the fourth invention. FIG. 2 is a sectional view of an essential part of the multi-point injection molding machine in this embodiment.
A multi-point injection molding machine 1 ′ used in the second embodiment has a configuration shown in FIG. In addition, the description is abbreviate | omitted by attaching | subjecting the same code | symbol to the same component as the multipoint injection molding machine 1 in 1st Embodiment.
The second embodiment is different in that a gas injection hole 60 that is a means for extending the skin film 50 to the mold surface of the movable mold 20 is provided in the fixed mold 10. The gas ejection holes 60 supply pressurized gas such as compressed air into cavities formed in the mold through the holes. The movable mold 20 is provided with a gas (air) vent hole (not shown). For this reason, the movable mold 20 is not provided with the vacuum suction hole 21 provided in the first embodiment. Other configurations are the same as those of the first embodiment. Therefore, also in this embodiment, one mold referred to in the present invention is the movable mold 20 and the other mold is the fixed mold 10.
[0022]
Since the second embodiment has the above-described configuration, the process of extending the skin film 50 to the movable mold 20 is performed as follows.
As shown in FIG. 2, the skin film 50 is placed on the mold surface of the movable mold 20 with the movable mold 20 opened relative to the fixed mold 10. This placement is performed with the surface side of the skin film 50 facing the mold surface of the movable mold 20. This mounting state is a state in which the skin film 50 is indicated by an imaginary line.
From the above state, the movable mold 20 is moved in the closing direction with respect to the fixed mold 10 to form a closed mold. When this closed state is reached, the skin film 50 extends along the convex surface of the fixed mold 10 following the concave surface of the movable mold 20 by being deformed.
In the above state, pressurized gas such as compressed air is ejected from the gas ejection hole 60 into the cavity 40. Then, the skin film 50 is pressed against the concave surface of the movable mold 20 by the pressurized gas, and deforms following the shape along the concave surface, and finally comes into close contact with the concave surface and extends. This state is a state in which the skin film 50 is indicated by a solid line. In the close contact state, the skin film 50 is in close contact with no wrinkles or twists.
Since the subsequent first filling step, second filling step, and step of taking out the molded product are the same as the respective steps in the first embodiment described above, description thereof will be omitted.
[0023]
In the first and second embodiments described above, after the skin film 50 is placed on the mold surface of the movable mold 20, the next first filling step is performed without suction or pressurization. You may move to.
In this case, the skin film is pressed against the mold surface of the movable mold 20 by the injected molten resin. At this time, it is desirable that the skin film 50 is heated and easily deformed before mounting so that the skin film 50 and the mold surface of the movable mold 20 are intimately adhered to each other.
Thereby, the extension process can be omitted at the time of multipoint injection molding, and the production speed is improved.
[0024]
Further, as an embodiment different from the above, the skin film 50 is previously molded into a predetermined shape by a molding apparatus different from the multi-point injection molding machine, and is fitted into the mold surface of the movable mold 20 at the time of multi-point injection molding. You can also. In addition, the operation | work which fits a skin film in a movable type may be performed by a human hand, and may be performed mechanically.
According to the above-described embodiment, the skin film is separately molded by an appropriate molding device outside the multi-point injection molding machine, so that the degree of freedom for preforming the skin film into a predetermined shape is increased. In addition, forming the skin film separately outside the multi-point injection molding machine in this way requires only considering the filling and solidification of the molten resin in the multi-point injection molding machine. It can be set as a simple structure. That is, a conventional ordinary multi-point injection molding machine can also be used. Furthermore, since the skin film molded into a predetermined shape can be confirmed when appropriately transferred from the molding apparatus to the multi-point injection molding machine, it is easy to find defective skin film products.
[0025]
Although the embodiments of the method for manufacturing an injection molded product according to the present invention have been described above, the method for manufacturing an injection molded product of the present invention can be implemented in various other modes.
For example, the structure for extending the skin film on one mold surface in the first embodiment and the second embodiment can be combined. That is, the vacuum suction hole 21 may be provided in the movable mold 20 and the gas ejection hole 60 may be provided in the fixed mold 10. Thereby, the adhesion of the skin film 50 to the mold surface of the movable mold 20 is more reliably performed, and the possibility that the skin film is wrinkled or twisted is reduced. Even if one of the functions fails, the work can be continued by the other one. Thereby, the product can be supplied without causing a delay in the work schedule.
[0026]
In each of the above embodiments, the case where one mold in the present invention is the movable mold 20 and the other mold is the fixed mold 10 is described. Conversely, one mold is the fixed mold 10 and the other mold is the other mold. May be a movable mold 20. In this case, the skin film 50 is placed on and closely adhered to the fixed mold 10 side.
Further, the extension timing of the skin film 50 to be in close contact with the mold surface of the mold may be before or after closing the movable mold 20 or before and after the mold clamping and fixing, before injecting the molten resin 100 in the first filling step. Absent.
[0027]
【The invention's effect】
Each invention of the present invention has the following effects by taking the above-described means.
First, according to the first invention, since the weld line generated in the injection-molded product is a manufacturing method that is concealed by the skin film, a manufacturing method using a multi-point injection molding machine is also applied to parts that are visually visible. Can be applied. As a result, according to this manufacturing method, the range of use of the injection molded product is expanded.
[0028]
Next, according to 2nd invention, since a skin film is extended to a shaping | molding die surface, a molded article with a high design effect can be manufactured.
Next, according to the third invention, the skin film is sucked by the vacuum suction hole provided in one of the molds and is extended to the surface of the molding die, so that the skin film is not wrinkled or twisted and is designed. Highly effective molded products can be manufactured.
Next, according to the fourth invention, the skin film is pressed by the gas injection hole provided in the other mold to extend to the molding die surface, so that the skin film is not wrinkled or twisted, and the design effect High-quality molded products can be manufactured.
Next, according to 5th invention, the freedom degree which shape | molds a skin film in a predetermined shape increases by shape | molding the skin film of a predetermined shape previously by a preliminary | backup process separately.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a multi-point injection molding machine according to a first embodiment.
FIG. 2 is a cross-sectional view showing a multi-point injection molding machine according to a second embodiment.
FIG. 3 is a cross-sectional view showing the first half of the first filling step of the first embodiment.
FIG. 4 is a cross-sectional view showing the second half of the first filling step and the first half of the second filling step according to the first embodiment.
FIG. 5 is a cross-sectional view showing a second half of the second filling step according to the first embodiment.
FIG. 6 is a perspective view of an injection molded product manufactured according to the first embodiment.
[Explanation of symbols]
1 Multi-point injection molding machine 1 'Multi-point injection molding machine 10 Fixed mold 11 First injection device 12 Second injection device 13, 14 Hopper 15, 16 Sprue 17 Injection first gate 18 Injection second gate 20 Movable die 21 Vacuum suction Hole 40 Cavity 50 Skin film 60 Gas injection hole 70 Molded product 71 Weld line

Claims (5)

In manufacturing a part that is visually visible, a manufacturing method of an injection molded product that manufactures a part with a multi-point injection molding machine,
A skin film placing step of placing a skin film on one of a movable mold and a stationary mold constituting a mold of a multi-point injection molding machine;
A first filling step of injecting molten resin from a first injection gate provided in the other mold of the fixed mold and the movable mold into a cavity in a mold, and filling and solidifying at least a part of the cavity;
After the first filling step, a second filling step of injecting molten resin from the injection second gate provided in the other mold same as the injection first gate in the remaining cavity, and filling and solidifying,
After the second filling step, opening the mold and taking out the molded product in the cavity;
A method for producing an injection-molded product, characterized in that a molded product in which a skin film is integrally attached to the surface is produced by the method described above. It is a manufacturing method of the injection-molded article according to claim 1,
After the said skin film mounting process, it has the extending process which extends the said skin film along the surface of one type | mold of a fixed mold | type and a movable mold | type, The manufacturing method of the injection molded product characterized by the above-mentioned. A method for producing an injection molded product according to claim 2,
The extending step of extending the skin film has a vacuum suction hole for sucking the skin film in one mold, and the skin film is sucked by the vacuum suction hole, thereby extending the skin film to the mold surface. A method for producing an injection-molded article, comprising: A method for producing an injection molded product according to claim 2,
The extending process of extending the skin film has a gas injection hole for pressing the skin film on one mold surface in the other mold, and presses the skin film with the gas from the gas injection hole. The manufacturing method of the injection-molded article characterized by extending an outer skin film to a mold surface. In manufacturing a part that is visually visible, a manufacturing method of an injection molded product that manufactures a part with a multi-point injection molding machine,
A preliminary step of forming a skin film of a predetermined shape by an appropriate molding apparatus outside the multi-point injection molding machine;
A step of fitting the skin film formed by the preliminary step into one of a movable die and a fixed die constituting the mold of the multi-point injection molding machine;
A first filling step of injecting molten resin from a first injection gate provided in the other mold of the fixed mold and the movable mold into a cavity in a mold, and filling and solidifying at least a part of the cavity;
After the first filling step, a second filling step of injecting molten resin from the injection second gate provided in the other mold same as the injection first gate in the remaining cavity, and filling and solidifying,
After the second filling step, opening the mold and taking out the molded product in the cavity;
A method for producing an injection-molded product, characterized in that a molded product in which a skin film is integrally attached to the surface is produced by the method described above.

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