JP2000052389A - Simultaneous decoration molding die and manufacture of simultaneously decorated molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool molten resin in the vicinity of an injection gate and prevent a pattern layer and the like of a decorative film from melting or the like. SOLUTION: A decorative film 1 is clamped between a movable mold 5 and a fixed mold 4, and molten resin 9 is injected from an injection gate 10 formed on the fixed mold 4 or the movable mold 5 into a cavity 2 to mold the decorative film 1 into a molded product simultaneously with the injection molding in a simultaneous decoration molding tool, and a mold surface cooling device 11 is built in a mold facing the injection gate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automobile interiors such as console panels, armrests, coin trays, door trims, center pillars, wheel caps, meter panels, dashboards, switch bases, instrument panels, operation buttons, and various bezels. Simultaneous decorative molding of exterior parts, front panel and operation buttons of AV equipment, or refrigerator doors, panels and operation buttons of home appliances such as washing machines, rice cookers, water purifiers, and LCD panels (thin-wall) of mobile phones The present invention relates to a method for manufacturing an article and a mold for simultaneous decorating that can be applied to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a decorative film having a pattern ink layer or the like formed on a base film is sandwiched between a movable mold and a fixed mold, and molten resin is injected into a cavity from an injection gate formed in the fixed mold. In the method for manufacturing a simultaneously molded decorative molded product in which the decorative film is integrally decorated with the molded product simultaneously with the injection molding by injection, the temperature of the molten resin injected near the injection gate is increased by the injection gate. The temperature is higher than the temperature of the molten resin that has flowed far (for example, the molten resin that has reached the end of the cavity). This is because heat is deprived by the mold while being swept away. In addition, near the injection gate, the molten resin at the injection speed collides with the decorative film at high temperature and high speed.

[0003]

For this reason, the pattern ink layer has been easily dissolved, washed away, deformed or destroyed. Alternatively, the base film itself may be partially stretched extremely, or may be broken due to partial dissolution, resulting in holes or the like.

SUMMARY OF THE INVENTION The present invention relates to a method and a method for manufacturing a simultaneously decorated decorative molded article for the purpose of cooling a molten resin in the vicinity of an injection gate so that a pattern layer or the like of a decorative film is not dissolved. The present invention relates to a simultaneous decoration mold.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a molding and decorating mold according to the present invention includes a decorative film sandwiched between a movable mold and a fixed mold, and a fixed or movable mold. By injecting the molten resin into the cavity from the injection gate formed at the same time, the molding and decorating mold for forming the decorative film into a molded product simultaneously with the injection molding is used. Characterized in that a mold surface cooling device is built in

In order to solve the above-mentioned problems, the method of manufacturing a simultaneously decorated decorative molded product according to the present invention comprises a decorative film sandwiched between a movable die and a fixed die to form a fixed or movable die. By injecting molten resin into the cavity from the injection gate, in the molding simultaneous decorative molded product manufacturing method of forming a decorative film into a molded product at the same time as injection molding, by cooling the mold surface facing the injection gate And cooling the molten resin and the decorative film near the injection gate.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a molding and decorating mold according to the present invention;

The mold for simultaneous decorating of the present invention and the decorative film applied to the mold for simultaneous decorating of the present invention will be described with reference to the drawings. As an example of the molding and decorating mold of the present invention, there is the following. The injection mold includes a movable mold 5 and a fixed mold 4. By sandwiching the decorative film 1 between the fixed mold 4 and the movable mold 5 and injecting the molten resin 9 into the cavity, simultaneously with the injection molding in the cavity, the gloss, matte, color pattern, etc. of the decorative film 1 are formed. It is possible to decorate the article 6 integrally.
The injection gate 10 for the molten resin 9 can be either a movable mold 5 or a fixed mold 4.
Formed. In the mold on which the injection gate 10 is not formed, the cavity concave portion 2 and the vacuum suction port 8 (formed on the cavity concave portion 2 or the parting surface 7) and the like are formed. Further, a clamp member 20 may be formed on the parting surface 7 of the mold on which the decorative film 1 is pressed. A die surface cooling device 11 is built in the die facing the injection gate 10. The mold surface cooling device 11 may be a water-cooled device in which a liquid flow path is provided in the mold. Alternatively, there is an air-cooled apparatus in which a cooling nitrogen gas flow path is provided in a mold. In the case of a water-cooled type device, the temperature of the liquid may be from 0 ° C. to room temperature, but can be appropriately adjusted within a temperature lower than the molten resin injected into the cavity. The built-in position is preferably at least below about 1 mm from the mold surface. If the height is more than 1 mm, the strength of the mold becomes weak, and inconveniences such as a depression of the mold surface due to collision of the molten resin easily occur. The area to be actually cooled has a size that covers at least the injection port of the injection gate 10. Further, the cooling portion is preferably a mold surface portion where the injected molten resin 9 first collides. The types of the injection gate 10 include a cold runner, a hot runner, a pin gate, and a side gate. The present invention is particularly suitable when a hot runner type in which a high-temperature molten resin easily collides with the decorative film 1 is used.

The decorative film 1 is formed by sequentially laminating a pattern layer, an adhesive layer and the like on a base film, and does not peel off the base film after the decorative film 1 and the molten resin 9 are integrally bonded. There is a so-called insert film. The decorative film 1 is formed by sequentially laminating a release layer, a pattern layer, an adhesive layer, and the like on a base sheet, and peels the base sheet after the decorative film 1 and the molten resin 9 are integrally bonded. There is a so-called transfer film. Examples of the material of the base sheet include polyethylene terephthalate, polypropylene, and acrylic. The picture layer is a layer that imparts decorativeness and functionality to the surface of the molded article. The picture layer includes a normal printed pattern and a conductive pattern formed of a conductive material. The picture layer can be formed with a resin binder and a pigment or a dye. The picture layer may use a resin binder and a metal pigment or an inorganic pigment having a masking property. The picture layer may be composed of a metal vapor-deposited layer to give a metallic luster. The adhesive layer is a layer for bonding the insert film and the molded product. For the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for the material of the molding resin can be appropriately used. For example, when the molding resin is an acrylic resin or a urethane resin, a vinyl chloride-vinyl acetate copolymer resin or an acrylic resin may be used as the adhesive layer. The picture layer and the adhesive layer are formed by various printing methods. The adhesive layer may use a resin film.

[0010] A method for producing a simultaneously-molded molded product of the present invention using the above-mentioned mold for simultaneous decorating will be described with reference to the drawings.

First, the decorative film 1 is introduced between the movable mold 5 and the fixed mold 4 (see FIG. 1). For example, the film may be unwound from a film roll of unwinding roll means provided above an injection mold including a fixed mold 4 and a movable mold 5.
Further, the decorative film 1 may be cut into individual sheets and introduced by hand or machine. Next, the decorative film 1 may be pressed against the clamp member 20. For example, the clamp member 20 is clamped by pulling in the direction of the parting surface and pressing the decorative film 1 around the cavity recess 2 of the mold. The mold for clamping the decorative film 1 may be a fixed mold having an injection gate formed thereon or a movable mold. Next, as another step different from the introduction of the decorative film 1, a heating means may be inserted between the fixed mold 4 and the movable mold 5 to heat the film 1.

Next, by closing the movable mold 5 and the fixed mold 4, the decorative film 1 is sandwiched between the movable mold 5 and the fixed mold 4 (see FIG. 2). By injecting the molten resin 9 into the cavity from the injection gate 10 formed in (1) (see FIG. 3), the decorative film 1 is formed into a molded product simultaneously with the injection molding (see FIG. 4). When the molten resin is injected, the surface of the mold facing the injection gate 10 is cooled to cool the molten resin 9 and the decorative film 1 near the injection gate 10. By cooling the injected molten resin 9 and the decorative film 1, the temperature of the molten resin 9 in the vicinity of the injection gate 10 is reduced by the molten resin 9 flowing away from the injection gate 10 (for example, the molten resin 9 reaching the end of the cavity). The temperature of the resin 9) can be made substantially the same. Further, since the surface of the mold facing the injection gate 10 is cooled, the decorative film 1 itself is also cooled. For this reason, the heat and impact received from the molten resin are further reduced. When a so-called transfer film is used as the decorative film 1, the base film is peeled off after the decorative film 1 and the molded product are integrated. As a molding material of the molten resin 9, a polystyrene resin, an ABS resin, a polycarbonate resin, a polypropylene resin, a polyethylene resin, or the like can be used. Finally, fixed type 4
After the mold and the movable mold 5 are opened, the clamp member 20 is separated from the mold, and the decorative molded product having the decorative film 1 adhered to the molded product 6 is taken out.

For example, when a polycarbonate resin of 270 ° C. is used as the molten resin 9, room temperature tap water is passed through a mold surface cooling device 11 built in the mold facing the injection gate 10, and the mold temperature is reduced. Should be about 60 ° C.

In the vicinity of the decorative film 1 cooled by the mold surface cooling device 11, the solidification of the molten resin 9 starts earlier in the injection process than in the case of using a non-cooled decorative film. For this reason, at the early stage of the injection process, the subsequent injection of the molten resin 9 protects the design ink layer and the like of the decorative film 1 from impact.

The present invention is particularly suitable for decorating a thin molded product with the decorative film 1. A thin molded product is, for example, a 120 mm long ×
A 50mm wide x 1.5mm thick mobile phone housing or 400mm long
A molded product of a refrigerator member having a width of 200 mm and a thickness of 2.5 mm is exemplified. In the former case, the distance between the injection gate 10 and the decorative film 1 is small, so that the decorative film 1 collides at a high speed. In the latter case, the distance between the injection gate 10 and the decorative film 1 is larger than the former,
This is because the molten resin 9 must be injected at a high speed and a high temperature in order to flow the molten resin 9 to every corner of the cavity, that is, to a position far from the injection gate. The injection at a high temperature is for preventing the molten resin 9 from solidifying and losing fluidity during the flow to a distant position. The present invention is particularly suitable when a heat-resistant resin is used as the molten resin 9. A heat-resistant resin is a resin that does not melt unless heated to a high temperature.
Therefore, even when such a resin is used as the molten resin 9, the resin will collide with the decorative film 1 at a high temperature. Examples of such a heat-resistant resin include an ABS resin and a polycarbonate resin.

[0015]

The present invention is directed to a method for manufacturing a simultaneously-molding mold and a simultaneously-molded molded product having the above-described structures.
Therefore, by cooling the mold surface facing the injection gate, the molten resin and the decorative film near the injection gate are cooled, so that the pattern ink layer and the base film formed on the decorative film become molten resin. Is no longer melted by the heat of the resin, and the heat and impact force of the molten resin on the decorative film can be reduced. As a result, the pattern by the pattern ink layer may be washed away, deformed or destroyed by the high-speed collision of the molten resin, the base film itself may be extremely stretched only at that portion, or may be broken by dissolution to form holes, etc. No more.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one process of a method of manufacturing a simultaneously-molded mold and a simultaneously-molded molded product of the present invention.

FIG. 2 is a cross-sectional view showing one process of a method for manufacturing a simultaneously-molded mold and a simultaneously-molded molded product of the present invention.

FIG. 3 is a cross-sectional view showing one process of a method for manufacturing a simultaneously-decorating mold and a simultaneously-decorated molded article according to the present invention.

FIG. 4 is a cross-sectional view showing one step of a method for manufacturing a simultaneously-molded mold and a simultaneously-molded molded product of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative film 2 Cavity recess 4 Fixed mold 5 Movable mold 6 Molded product 7 Parting surface 8 Vacuum suction port 9 Molten resin 10 Injection gate 11 Mold surface cooling device 20 Clamp member

Claims (2)

[Claims] 1. A decorative film is sandwiched between a movable mold and a fixed mold, and molten resin is injected into a cavity from an injection gate formed in the fixed mold or the movable mold, whereby the decorative film is formed simultaneously with injection molding. What is claimed is: 1. A molding and decorating mold for forming a molded article, wherein a mold surface cooling device is incorporated in a mold facing an injection gate. 2. A decorative film is sandwiched between a movable mold and a fixed mold, and a molten resin is injected into a cavity from an injection gate formed in the fixed mold or the movable mold, so that the decorative film is formed simultaneously with injection molding. A method for manufacturing a simultaneously molded decorative product formed on a molded product, wherein the molten resin and the decorative film near the injection gate are cooled by cooling a mold surface facing the injection gate. Method of manufacturing decorative molded products.