JP2000015658A - Film heating apparatus and preparation of molded article with picture pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring a picture pattern film into intimate contact with a cavity forming face not so as to have damage and excess extension of the picture pattern film and damage and strain of the picture pattern by heating enough the picture pattern film regardless of depth of a cavity forming face. SOLUTION: A film heating apparatus for heating a picture pattern film 1 introduced into a mold for injection molding which has at least two cavity forming faces with different depths from the parting face 7 in a cavity recessed part 2 is provided and an apparatus for heating a large depth part which can heat only a picture pattern film 1 on a large depth cavity forming face 50 is provided.

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. Manufacturing method of exterior parts, front panel and operation buttons of AV equipment, or molded products with patterns such as panels and operation buttons of home appliances such as washing machines, rice cookers, water purifiers, etc., and film heating devices applicable to the manufacturing method About.

[0002]

2. Description of the Related Art A conventional method for producing a molded article with a picture has been described below. In other words, after introducing the design film into the injection mold having two or more cavity forming surfaces having different depths from the parting surface in the cavity recesses,
The picture film is fixed to the parting surface with a clamp member, and then the entire picture film is heated by a single film heating device, and the picture is temporarily drawn on the small- and deep-cavity forming surfaces by vacuum suction. Close the film, then close the mold for injection molding, inject the molten resin into the cavity with the pattern film sandwiched in the mold for injection molding, and integrate the pattern film with the molded product. is there.

[0003]

However, since the conventional film heating apparatus heats a picture film at a fixed position regardless of the depth of the cavity forming surface, a large depth cavity is formed by vacuum suction or the like. When trying to make the picture film adhere to the surface, the film itself and the picture were easily damaged. In other words, in order for the design film to adhere to the small-depth cavity formation surface, it is sufficient to spread the design film small, but to make the design film adhere to the large-depth cavity formation surface, the design film must be spread greatly. Must. In order to increase the spread, the film must be sufficiently heated to have flexibility. However, conventionally, since the heating device was at a fixed position, as the pattern film approaches the deep cavity forming surface,
The distance between the heating device and the design film was increased, and the heat from the heating device was difficult to reach the design film, resulting in insufficient heating. For this reason, the desired flexibility of the picture film cannot be obtained on the deep cavity forming surface. If such a design film is forcibly brought into close contact with the deep cavity forming surface by vacuum suction or the like, the design film is damaged or the design is broken. In order to solve the insufficient heating, it is conceivable to increase the temperature setting of the heating device, but since the pattern film to be in close contact with the small depth cavity forming surface is heated more than necessary,
The picture film was spread too much or the picture was distorted.

[0004] The present invention provides sufficient heating of a picture film regardless of the depth of a cavity forming surface, so that the picture film is not damaged or spread excessively and the picture is not damaged or distorted. The present invention relates to a method for producing a molded article with a picture and a film heating apparatus for the purpose of allowing a picture film to be in close contact with a cavity forming surface.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a film heating apparatus according to the present invention provides an injection molding metal having two or more cavity forming surfaces having different depths from a parting surface in a cavity recess. A film heating device for heating a design film introduced into a mold, comprising a large-depth-portion heating device that can enter a cavity concave portion and heat only a design film on a deep-cavity forming surface. It is characterized by the following.

[0006] In order to solve the above problems, the film heating apparatus according to the present invention comprises:
The deep part heating device may have a skirt for clamping the picture film around the deep cavity forming surface.

In order to solve the above problems, the film heating apparatus of the present invention is introduced into an injection mold having two or more cavity forming surfaces having different depths from a parting surface in a cavity recess. A film heating device for heating a picture film, comprising a small-depth portion heating device capable of heating a picture film on a small-depth cavity forming surface.

In order to solve the above-mentioned problems, the method for manufacturing a molded article with a picture according to the present invention is intended to solve the above-mentioned problem. After the picture film with the picture is introduced to the part film, the picture film is clamped to the parting surface with a clamp member, and then the picture film is brought into close contact with the small-depth cavity forming surface by vacuum suction. Only the upper pattern film is heated, the pattern film is brought into close contact with the deep cavity forming surface by vacuum suction, then the injection mold is closed, and the pattern film is sandwiched in the injection mold. The present invention is characterized in that a molten resin is injected into a cavity to integrate a picture film and a molded product.

In order to solve the above-mentioned problems, a method for manufacturing a molded article with a picture according to the present invention is an injection molding die having two or more cavity forming surfaces having different depths from a parting surface in a cavity concave portion. After the pattern film is introduced, the pattern film is clamped to the parting surface with a clamping member, and then the pattern film on at least the small depth cavity forming surface is heated, and the pattern film is formed on the small depth cavity forming surface by vacuum suction. Then, only the picture film on the deep cavity forming surface is heated, the picture film is brought into close contact with the deep cavity forming surface by vacuum suction, then the injection molding die is closed, and the injection is performed. It is characterized by injecting molten resin into the cavity while holding the pattern film in the molding die, and integrating the pattern film with the molded product. It is intended.

In order to solve the above-mentioned problems, the method of manufacturing a molded article with a pattern according to the present invention includes the steps of: It fixes the film.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a film heating apparatus according to the present invention;

First, an injection mold and a picture film used in the present invention and a film heating apparatus of the present invention will be described. The following are examples of injection molding dies. The injection mold includes a movable mold 5 and a fixed mold 4. The fixed mold 4 and the movable mold 5 sandwich the pattern film 1 therebetween and inject the molten resin into the cavity, thereby forming a predetermined pattern of the pattern film 1 on the molded product 6 simultaneously with the injection molding in the cavity recess 2. can do. Cavity recess 2 and vacuum suction port 8 (formed on cavity recess 2 or parting surface 7)
And, the injection gate 10 and the like of the molten resin 9 may be formed in the movable mold 5 or may be formed in the fixed mold 4 (see FIGS. 5 to 12). The cavity recess 2 has two or more cavity forming surfaces having different depths from the parting surface 7. That is, the cavity forming surface includes the small depth cavity forming surface 51 and the large depth cavity forming surface 50. The deep cavity forming surface 50 may be present at the center of the small deep cavity forming surface 51 or may be present at the end. Further, for example, the small depth cavity forming surface 51
However, it may have two or more different depths of the cavity forming surface.

The film heating apparatus according to the present invention includes, for example,
The present invention is applied to the injection mold described above.
That is, a film heating apparatus for heating the picture film 1 introduced into the injection molding die having two or more cavity forming surfaces having different depths from the parting surface 7 in the cavity concave portion 2. It is provided with a large-depth-portion heating device 31 that can enter the inside and heat only the picture film 1 on the large-depth cavity forming surface 50.

The large-depth-portion heating device 31 has a heating portion 33 large enough to enter the cavity concave portion 2 since it enters the cavity concave portion 2. The deep part heating device 31 may be a flat plate or may have a skirt portion 34 for clamping the picture film 1 around the deep cavity forming surface 50. By clamping the design film 1 with the skirt portion 34, the space between the design film 1 and the heating unit 33 can be made a closed space.

The film heating device may have a small-depth portion heating device 32 capable of heating the picture film on the small-depth cavity forming surface 51 (FIGS. 13 to 1).
5). The large-depth-portion heating device 31 may be also used as the small-depth-portion heating device 32. In this case, as the large-depth portion heating device 31, a device having a heating portion 33 having an area approximately the same as or slightly larger than that of the cavity concave portion 2 is used. A mechanism may be used in which only the region which enters the inside 2 and a part of which is separated corresponds to the deep cavity forming surface 50 is heated.

The clamp member 20 includes, for example, a frame-shaped clamp member, a planar "one" -shaped clamp member, and a planar substantially "U" -shaped clamp member. The clamp member is
It is not provided directly on the injection molding die, but enters into the injection molding die from outside the injection molding die by means of a robot arm or the like, and the pressing force of the arm or the electromagnetic force of the electromagnet causes the mold party to move. The pattern film 1 may be clamped on the bearing surface 7. Further, the clamp member may be provided with a cutting means such as a heat cutter 11 for cutting the picture film 1 when fixing the picture film (see FIG. 12).

The pattern film 1 is a film in which a pattern layer, an adhesive layer and the like are sequentially laminated on a base sheet, and the base sheet is not peeled off after the molding resin adheres to the pattern film.
There is a so-called insert film. The picture film 1 is a film in which a release layer, a picture layer, an adhesive layer, and the like are sequentially laminated on a base sheet, and there is a so-called transfer film that peels the base sheet after a molding resin adheres to the picture 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 film and the molded product. For the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for the material of the molding resin is 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. In addition, the "pattern" refers to a pattern or color represented by the pattern layer, or a pattern or color of the base sheet itself.

A method of manufacturing a molded article with a picture of the present invention using the above-described film heating apparatus and the mold for simultaneous painting will be described with reference to the drawings.

First, the picture film 1 is placed in the injection mold.
Is introduced. For example, above the injection mold including the fixed mold 4 and the movable mold 5, the leading end 12 (divided end) in the introduction direction of the picture film 1 unwound from the film roll of the unwinding roll means 13 is filmed. The film is gripped by the film gripping means 14 (the pushing member 16 and the receiving member 17) as the introducing means (see FIG. 5). Front end 12 of picture film 1 in the introduction direction
Is made to protrude from the film gripping means 14. The film gripping means 14 is fixed to the end of a strip or a wire 18. Next, the strip member or the wire 18, the ball screw, etc. are driven in the longitudinal direction to move the pushing member 16 and the receiving member 17 holding the picture film 1 downward, and the picture film 1 is put into the injection mold. Introduction (see FIG. 6). The picture film 1 may be introduced into the injection mold only by its own weight without using the film introducing means. Further, the picture film 1 may be cut into single sheets.

Next, the picture film 1 is fixed to the clamp member 20 or the parting surface 7. For example, the film gripping means 14 gripping the picture film 1 is
It is made to approach the clamp fixing member 3. The leading edge of the picture film 1 protruding from the film holding means 14 may be sandwiched and fixed between the clamp fixing member 3 and the clamp member 20 (see FIG. 6). Alternatively, the leading edge of the picture film 1 protruding from the film holding means 14 may be sandwiched and fixed between the clamp fixing member 3 and the parting surface 7 (not shown). The film gripping means 14 releases the picture film 1 and retreats above the cavity concave portion, grasps the picture film 1 above the heat cutter 11, and fixes the clamp member 20 and the film gripping means 1.
The tension is applied to the pattern film 1 between the four positions (see FIG. 7). This tension may be generated by rotating the film roll of the unwinding roll means 13 in the reverse direction without using the film gripping means 14. The place where the picture film 1 is fixed may be the entire clamp member 20,
Only the film downstream side portion 42 of the clamp member 20 may be used. The fixed picture film 1 is clamped to the parting surface 7. For example, the clamp member 2
0 is clamped by driving the tension rod 25 and pressing the pattern film 1 around the cavity recess 2 of the mold (see FIGS. 1 and 8). The mold for clamping the picture film 1 may be a fixed mold having an injection gate (see FIG. 11) or a movable mold. When the design film 1 is pressed to a predetermined location around the cavity recess 2, the tension applied to the design film 1 may be adjusted. In addition, when pressing, that is, simultaneously with or after pressing, the picture film 1 is divided on the downstream side of the film gripping means 14 by the heat cutter 11 above the clamp member, and the space between the clamp device and the mold is removed. And a picture film 1 having a leading end 12 (divided end) in the introduction direction (see FIG. 9).

Next, the heating means 30 is inserted between the fixed mold 4 and the movable mold 5 as a step different from the introduction of the picture film 1 to heat the picture film 1 (see FIG. 9). At least the picture film 1 on the small depth cavity forming surface 51
Is heated by, for example, the small-depth-portion heating device 32 (see FIG. 13), and the picture cavity 1 is brought into close contact with the small-depth cavity-forming surface 51 by vacuum suction of the cavity concave portion 2 (see FIGS. Next, the deep cavity forming surface 5
Is heated by the deep-depth-portion heating device 31 and the deep-depth cavity forming surface 50 is drawn by vacuum suction.
The picture film 1 is brought into close contact (see FIGS. 4 and 15).
At the time of heating by the deep part heating device 31, the pattern film 1 may be clamped around the deep cavity forming surface 50 by the skirt portion 34 of the deep part heating device 31. In this manner, the pattern film 1 that is in close contact with the small-depth cavity forming surface 51 is
There are advantages such as being prevented from being displaced by being pulled toward zero.

Next, the picture film 1 is placed in the injection mold.
Inject the molten resin into the cavity recess while holding the
The picture film and the molded product are integrated. For example, the fixed mold 4 and the movable mold 5 are closed, the pattern film 1 is sandwiched, the molten resin 9 is injected from the injection gate 10, and the molten resin 9 is kept in contact with the adhesive layer of the pattern film 1 and the molten resin 9. Is cooled and solidified, and the picture film 1 adheres to the molded article 6 (see FIGS. 4 and 10). When a so-called transfer film is used as the picture film 1, the base sheet is peeled off after the picture film and the molded product are integrated. As a molding material of the molten resin 9, polystyrene resin, AB
An S-based resin, a polycarbonate-based resin, a polypropylene-based resin, a polyethylene-based resin, or the like can be used.
Finally, after the fixed mold 4 and the movable mold 5 are opened, the clamp member is separated from the mold, and the pattern film 1
Take out the molded product with the picture that has been adhered.

[0023]

Since the present invention is a film heating apparatus and a method for manufacturing a molded article with a pattern as described above, a large depth section for heating a pattern film in a portion requiring a larger spread. Even if the picture film is forcibly brought into contact with the deep cavity forming surface by vacuum suction, etc.
The film itself and the picture are hardly damaged. In other words, after the pattern film is brought into close contact with the small-depth cavity forming surface, the large-depth-portion heating device enters the cavity concave portion, approaches the bridge-shaped pattern film above the large-depth cavity forming surface, and approaches the pattern film. Since only the film is heated, the heat from the heating device surely reaches the picture film, and insufficient heating can be eliminated. The point that the picture film is cooled while moving largely can also be reliably compensated. Therefore, the flexibility of the picture film is sufficient even on the surface on which the deep cavity is formed.
Since the flexibility is sufficient, even if the pattern film is forcibly brought into close contact with the deep cavity forming surface by vacuum suction or the like, the pattern film is not damaged or the pattern is not broken.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 2 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 3 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 4 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 5 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 6 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 7 is a cross-sectional view showing one embodiment of the film heating apparatus of the present invention and one step of the method of manufacturing a molded article with a picture.

FIG. 8 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 9 is a cross-sectional view showing one embodiment of a film heating apparatus according to the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 10 is a cross-sectional view showing one embodiment of a film heating apparatus of the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 11 is a cross-sectional view showing one embodiment of a film heating apparatus of the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 12 is a cross-sectional view showing one embodiment of a film heating apparatus of the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 13 is a cross-sectional view showing one embodiment of a film heating apparatus of the present invention and one step of a method of manufacturing a molded article with a picture.

FIG. 14 is a cross-sectional view showing one embodiment of the film heating apparatus of the present invention and one step of the method of manufacturing a molded article with a picture.

FIG. 15 is a cross-sectional view showing one embodiment of the film heating apparatus of the present invention and one step of the method for producing a molded article with a picture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Picture film 2 Cavity recess 3 Clamp fixing member 4 Fixed mold 5 Movable mold 6 Molded product 7 Parting surface 8 Vacuum suction port 9 Molten resin 10 Injection gate 11 Heat cutter 12 Introductory end part 13 Unwinding roll means 14 Film gripping Means 16 Pushing member 17 Receiving member 18 Wire 19 Wire drum 20 Clamp member 23 Air cylinder 25 Pull rod 30 Heating means 31 Large depth heating device 32 Small depth heating device 33 Heating portion 34 Skirt portion 41 Rod 42 Film downstream portion 43 Upstream portion of film 50 Large depth cavity forming surface 51 Small depth cavity forming surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshikazu Kobe 3, Mibuhanai-cho, Nakagyo-ku, Kyoto-shi, Kyoto Inside Nihon Photo Printing Co., Ltd. Address Nihon Photo Printing Co., Ltd. F-term (reference) 4F202 AA11 AA13 AA28 AD09 AG03 AH17 AH33 CA11 CB01 CB13 CB19 CB22 CK11 CK84 CQ06 4F206 AA11 AA13 AA28 AD09 AG03 AH17 AH33 JA07 JB13 JB21 JFJ

Claims (6)

[Claims] 1. A film heating apparatus for heating a picture film introduced into an injection molding die having two or more cavity forming surfaces having different depths from a parting surface in a cavity concave portion, the film heating device comprising: Get into
A film heating device comprising a deep portion heating device capable of heating only a design film on a deep cavity forming surface. 2. The film heating device according to claim 1, wherein the deep portion heating device has a skirt portion for clamping a picture film around a deep cavity forming surface. 3. A film heating apparatus for heating a picture film introduced into an injection molding die having two or more cavity forming surfaces having different depths from a parting surface in a cavity concave part, wherein the small-depth cavity is provided. The film heating device according to claim 1, further comprising a small-depth portion heating device capable of heating the picture film on the forming surface. 4. After a picture film is introduced into an injection molding die having two or more cavity forming faces having different depths from a parting face in a cavity recess, the picture film is put on the parting face by a clamp member. Clamp and
Next, the pattern film is brought into close contact with the small cavity forming surface by vacuum suction, and then only the pattern film on the large depth cavity forming surface is heated, and the pattern film is brought into close contact with the large depth cavity forming surface by vacuum suction. Next, the mold for injection molding is closed, the molten resin is injected into the cavity while the design film is sandwiched in the mold for injection molding, and the design film and the molded product are integrated with each other. Manufacturing method of molded products. 5. After a picture film with a picture is introduced into an injection molding die having two or more cavity forming surfaces having different depths from a parting face in a cavity concave part, the picture film is parted by a clamp member. Surface, then heat the pattern film on at least the small-depth cavity-forming surface, adhere the pattern film to the small-depth cavity-forming surface by vacuum suction, and then only the pattern film on the large-depth cavity-forming surface Is heated, the picture film is brought into close contact with the deep cavity forming surface by vacuum suction, then the injection mold is closed, and the molten resin is injected into the cavity while the picture film is sandwiched in the injection mold. A method for producing a molded article with a picture, characterized by injecting and integrating a picture film and a molded article. 6. The method according to claim 4, wherein the pattern film is fixed to the small-depth cavity forming surface by a clamp member before heating only the pattern film on the large-depth cavity forming surface. .