JP2000293109A - Manufacture of three-dimensional shape display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for post fabrication, such as painting, and to provide an advantage in terms of a cost by curtailing of stages. SOLUTION: At the time of insert molding of a film 3 by injection molding, the cut face of the film 3 jumps out of a mold parting plane during insertion. When the molds close successively in this state, the cut face of the film 3 deflects to an inner side by abutting on a fillet or chamfered shape and thereafter, a molten injection molding resin 2 flows in and outwardly presses the film 3 and the injection molding resin 2 cools to solidify by profiling the fillet or chamfered shape on the moving side, by which the shape is transferred and, therefore, the printed film 1 is rolled into the end face. The need for post fabrication, such as painting, may thus be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention enhances the end face treatment in the case of insert molding by injection molding after heat molding a printed thermoplastic film on a three-dimensional display and removing unnecessary parts,
The present invention relates to a method of manufacturing a three-dimensional display that emits light when it is desired to prevent light from leaking from its end face.

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a case where a thermoplastic film which has been printed on a timepiece, a dial of various instruments and other three-dimensional displays is heat-formed, unnecessary portions are removed, and then insert-molded by injection molding. This method can be widely used as a manufacturing method when it is desired to make the end face processing beautiful and to prevent light from leaking from the end face in a three-dimensional display that emits light.

[0002]

2. Description of the Related Art A three-dimensional display that emits light is taken as an example.

FIG. 2 shows a portion (1) that emits light as in a conventional shape example, so that a transparent or cloudy color is selected for an injection-molded resin (2). When heat-molding a printed thermoplastic film and then insert-molding the film (3) from which unnecessary parts have been removed by injection molding, light leakage occurs at the end face (4) from the downward direction (5) and the gap (6). Was. For example, in the case of a combination of a switch emitting light and a switch box, there is no problem because other parts can cover the end face (4), but there is no problem.
In the case of a combination that cannot cover up, it was necessary to perform post-processing such as painting to eliminate the light leakage.

[0003]

SUMMARY OF THE INVENTION An end face treatment in a case where a printed thermoplastic film is heat-formed on a three-dimensional display to remove unnecessary portions and then insert-molded by injection molding is beautifully performed. In addition, a three-dimensional display that emits light eliminates light leakage, eliminates the need for post-processing such as painting, and measures the cost merit by eliminating steps.

[0004]

Means for Solving the Problems After removing a unnecessary portion from a film (3) formed by heating and forming a printed thermoplastic film,
When performing insert molding by injection molding, the reverse case may occur depending on the shape, but usually, the printed surface is inserted on the fixed side because the decorative surface does not want to make a trace of a protruding pin or the like.

FIG. 3 shows a state in which the cut surface of the film (3) protrudes from the parting surface (7) on the mold fixing side (8) during insertion, and the film is closed when the mold is closed. The cut surface of (3) is engraved on the movable side of the mold (9) (10)
And then flexes inward due to the fillet or chamfer at the bottom

FIG. After the mold is completely closed, the melted injection molding resin (2) flows in, presses the printed film (3) outward, and follows the shape of the fillet or chamfer on the movable side, whereby the injection molding resin (2) cools and solidifies. The shape is transferred

FIG.

[0005]

According to the manufacturing method as described in the preceding paragraph, no gap is generated in the end face (4) and the downward direction (5) can be sufficiently covered with the printed film (3), so that the end face treatment is beautiful and the quality is improved. Was. With a three-dimensional display that emits light, light leakage can be eliminated only by the concealment of ink, and paint etc.
Removal of the post-process has come true.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When a film (3) formed by heating and molding a printed thermoplastic film is subjected to insert molding by injection molding after removing unnecessary portions,

FIG. 3 shows a state in which the cut surface of the film (3) protrudes from the parting surface (7) on the mold fixing side (8) during insertion, and the film is closed when the mold is closed. The cut surface of (3) is engraved on the movable side of the mold (9) (10)
And then flexes inward due to the fillet shape at the bottom.

FIG. After the mold is completely closed, the molten injection-molded resin (2) flows in, presses the printed film (3) outward, imitates the movable-side fillet, and cools and solidifies the injection-molded resin (2) to transfer the shape. Is

FIG. Although a fillet shape is used in the embodiment, a chamfered shape or a tapered shape is also possible.

[0007]

According to the manufacturing method as described in the preceding paragraph, the end face (4)
The printed film (3) can be sufficiently covered in the downward direction (5) so that the printed film (3) is rolled up, so that the end face treatment is beautiful and the quality is improved. Also emits light 3
In a two-dimensional display, light leakage can be eliminated only by the concealment of ink, eliminating post-processing such as paint, and providing a merit in terms of cost. Also, there is no shift in color tone between printing ink and paint. The quality was also improved.

[Brief description of the drawings]

FIG. 1 is a perspective sectional view of the present invention.

FIG. 2 is a conventional perspective cross-sectional view.

FIG. 3 is a cross-sectional view of the present invention when inserted into a mold.

FIG. 4 is a sectional view of the present invention when the mold is closed.

[Explanation of symbols]

 (1) is a part that emits light (2) is injection molding resin (3) is film (4) is end face (5) is downward (6) is gap (7) is parting surface (8) is mold fixed The side (9) is the mold movable side (10) is engraved

Claims (1)

[Claims] 1. A printed thermoplastic film using a fillet or a chamfer as an end surface treatment for insert molding by injection molding after heat molding of a printed thermoplastic film on a three-dimensional display to remove unnecessary portions. A three-dimensional display that emits light and has a light-shielding property to prevent light from leaking from an end face of the display.