JPH11129283A - Synthetic resin molded article and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin molded article which can mold a resin of high melt viscosity incorporated with grass fibers and others integrally without deteriorating a design near a gate part of the synthetic resin and has a surface protective layer which is excellent in design, can select materials widely, and has a high degree of freedom in design. SOLUTION: A method consists of a process in which a laminate in which a printing film 4 is laminated is arranged on the second mold 20 corresponding to the first mold 10 having a gate part G for injection molding, and on the laminate S, a protection member T the size of which is equal to or greater than that of the opening of the gate part is arranged at a place facing the neighborhood of the gate opening of the first mold, a process in which the first mold and the second mold are closed, and a process in which a molten resin is injected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin molded article in which a transparent film or the like is integrally hard-coated on a print film and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a synthetic resin molded article having a transparent transparent film is made of a thermoplastic resin which can secure a design property in advance in a mold as described in JP-A-60-92586. There is disclosed a synthetic resin molded article having a transparent film surface by inserting a film or a laminate and injecting a molten resin into a mold thereof, and a method of manufacturing the same.

By using this technique, it is not necessary to apply a coating to a synthetic resin molded product, and it is possible to decorate a product surface with a design which is difficult to apply by coating.

[0004]

However, in the above technique, although the film and the synthetic resin are fused by heat, heat and shear force act on the film during molding, and as a result, the appearance of the film is reduced. There was a case where a defect such as damage occurred. In particular, when an inorganic filler such as glass fiber is mixed with a synthetic resin, the film is greatly attacked, and the appearance is significantly damaged.

In order to solve the above problems, a method of providing a side gate at a position different from the design surface, for example, on the side surface of a synthetic resin molded product, or a resin having a low melt viscosity so as not to affect the design property is employed. And a method of increasing the heat resistance of the printed layer.

However, in the above method, there is a problem in that the shape and the material are limited, and the degree of freedom in design is reduced.

[0007] The present invention has solved the above problems,
An object of the present invention is to provide a synthetic resin article having a surface protective layer which is excellent in design, has few restrictions on materials, and has a high degree of freedom in design, and a method for producing the same.

[0008]

Means for Solving the Problems In order to solve the above technical problems, the technical measures taken in claim 1 of the present invention are as follows.

A printing film laminated on a synthetic resin molded product, and a transparent film laminated on the printing film, wherein the size of the gate opening of the injection mold is substantially equal to or greater than the size of the gate opening of the injection mold. A synthetic resin molded product characterized by being injection-molded by disposing the protective member described above.

[0010] With this configuration, a surface synthetic resin product having excellent design properties, few restrictions on materials, and high design flexibility can be manufactured.

The technical measures taken in claim 2 of the present invention are as follows.

A laminate in which a printed film is laminated on a second mold corresponding to a first mold having a gate portion for injection molding is provided, and the first mold is provided on the laminate. Disposing a protection member having a size substantially equal to or larger than the size of the gate opening at a location facing the vicinity of the gate opening of the mold;
A step of closing the mold and the second mold, and a step of injecting a molten resin.

According to the above method, there is provided a method for producing a synthetic resin product having a surface protective layer which is excellent in design, has few restrictions on materials, and has a high degree of freedom in design.

The technical measures taken in claim 3 of the present invention are as follows.

[0015] The protection member is made of a resin material made of polyphenylene sulfide.
Alternatively, there is provided a synthetic resin molded product according to claim 2 and a method for producing the same.

Since this material has a high melting point and a small elongation, the effect of protecting the gate portion is high. The effect of the tensile strength is small.

The technical measures taken in claim 4 of the present invention are as follows.

The protective member has a thickness of 10 μm to 300 μm.
m. The synthetic resin molded product according to claim 1 or 2, and a method for producing the same.

If the thickness is less than 10 μm, printing destruction is likely to occur.
If the thickness is more than 300 μm, resin sink is likely to occur at a portion where the protection member is stepped.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

EXAMPLE As shown in FIGS. 1-3, an extruded molecular weight of 280
00, a 0.5 mm thick transparent polycarbonate resin laminate 1 coated on one side with an acrylic primer 2 of 5 μm and a silicon hard coat 3 of 3 μm (trade name: Iupilon sheet MR-OX, Mitsubishi Engineering-Plastics) Using polyester-based ink 4 (trade name: HI-PET (black),
(Jujo Kako Co., Ltd.) is applied by screen printing to a thickness of 20 μm.

As shown in FIG.
A polyester ink 5 for the purpose of adhering to a resin is further applied by screen printing to a thickness of 20 μm on the screen-printed printing layer.

Next, as shown in FIG. 5, the formed laminate S is punched into a desired product shape, and a gate portion G is formed.
Then, a tape-like protective member T (Torelina PPS film, manufactured by Toray Industries, Inc.) made of a polyphenylene sulfide (PPS) film having a thickness of 25 μm is adhered.

FIGS. 6 and 7 are cross-sectional views of the vicinity of the injection mold. With the first mold 10 and the second mold 20 open as shown in FIG. 6, the laminate S is placed on the mold surface of the second mold 20 so that the hard coat surface becomes the design surface. The laminated body S in the form of a laminated body to which the above-described protective member T is adhered is provided. At this time, the size of the opening of the gate portion G of the first mold 10 is 1 × 2 mm.
The size of the protection member T is 1.5 × 1.5 mm.

Next, the mold is closed and the polycarbonate (P
C) / Molten resin composed of polyethylene terephthalate (PET) / glass fiber (GF) (GMB111)
0, manufactured by Mitsubishi Engineering-Plastics Co., Ltd.) into the gate portion G by the injection molding machine 30. 275 ° C melting temperature of the resin at the nozzle tip of this time, the maximum injection pressure is 600kgf / cm ² (58.8MPa), holding pressure molding in 5 seconds 500kgf / cm ² (49.0MPa).

Comparative Example A PET (polyethylene terephthalate), PC (polycarbonate), PP (polypropylene), or PI (polyimide) resin was used in place of the polyphenylene sulfide (PPS) film, which was the protective member described in the prior art. The other conditions were the same as those of the examples under the same materials.

The melting point of each of the above resins, tensile elongation at break,
Table 1 shows the tensile rupture strength and the diameter of the gate portion printing failure.

[0028]

[Table 1]

As can be seen from Table 1, it can be seen that a protective member having a higher melting point and less elongation, such as polyphenylene sulfide (PPS), has a higher effect of protecting the gate portion. Further, it is understood that the influence of the tensile strength is small.

Next, Table 2 is a table showing the relationship between the thickness of the protective member and the diameter of the gate portion printing destruction, using a polyphenylene sulfide (PPS) film as the protective member.

[0031]

[Table 2]

It can be seen from Table 2 that the thicker the protective member, the less the print breakage. However, if it was too thick, traces of the protective member were found from the design side. This is considered to be due to the sink of the resin occurring at the step portion of the end portion of the protective member. As can be seen from this table, the optimum thickness of the protective member was 25 μm.

[0033]

As described above, the present invention comprises a printing film laminated on a synthetic resin molded product, and a transparent film laminated on the printing film, and a gate of an injection mold is provided on the printing film side. What is claimed is: 1. A synthetic resin molded product characterized by being provided with a protective member substantially equal to or larger than the size of the opening and being injection molded. A laminate in which a printing film is laminated on a second mold corresponding to the mold is provided, and the gate opening is formed on the laminate at a location facing the vicinity of the gate opening of the first mold. A manufacturing method characterized by comprising a step of disposing a protective member having substantially the same size or larger than a size, a step of closing the first mold and the second mold, and a step of injecting a molten resin. Therefore, the design near the gate of the synthetic resin is damaged. It not, it is possible to integrally mold the high melt viscosity of the glass fiber or the like resin.

In addition, it is possible to provide a synthetic resin product having a surface protective layer which is excellent in design, has few restrictions on materials, and has a high degree of design freedom, and a method for producing the same.

[Brief description of the drawings]

FIG. 1 is a perspective view of a polycarbonate resin laminate of the present invention.

FIG. 2 is a perspective view of a laminate obtained by applying an acrylic primer and a silicon-based hard coat to one surface of a polycarbonate resin laminate.

FIG. 3 is a perspective view of a laminate obtained by screen-printing a polyester-based ink on the laminate of FIG. 2;

FIG. 4 is a perspective view of a laminate obtained by screen-printing a polyester-based ink for bonding onto the laminate of FIG. 3;

FIG. 5 is a perspective view in which a protective member is attached to the laminate of FIG. 5;

FIG. 6 is a sectional view of a mold and an injection molding machine in a state where a laminate in which a protective member is adhered to a second mold is provided.

FIG. 7 is a sectional view showing a state where the first mold and the second mold are closed and a molten resin is injection-molded by an injection molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent film (transparent carbonate film) 4 ... Printing film (polyester-based ink) 10 ... 1st metal mold 20 ... 2nd metal mold S ... Laminated body T ... Surface protective layer

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Katsuhiko Takeuchi, Inventor 2-1-1 Asahi-machi, Kariya-shi, Aichi Aisin Seiki Co., Ltd. (72) Makoto Sakai 2-1-1, Asahi-cho, Kariya-shi, Aichi Aisin Seiki Co., Ltd.

Claims (4)

[Claims] 1. A printing film laminated on a synthetic resin molded product, and a transparent film laminated on the printing film, wherein the size of the gate opening of the injection molding die is substantially smaller on the side of the printing film. A synthetic resin molded article characterized by being injection-molded by disposing at least the same protective member. 2. A laminate comprising a printed film laminated on a second mold corresponding to a first mold having a gate portion for injection molding, wherein the first film is provided on the laminate. Disposing a protection member substantially equal to or larger than the size of the gate opening at a location facing the vicinity of the gate opening of the mold;
A step of closing the mold and the second mold, and a step of injecting a molten resin. 3. The protection member according to claim 1, wherein the protection member is made of a resin material made of polyphenylene sulfide.
Alternatively, the synthetic resin molded product according to claim 2 and a method for producing the same. 4. The protection member has a thickness of 10 μm to 300 μm.
The synthetic resin molded article according to claim 1 or 2, and a method for producing the same.