JP2001347538A - End face treatment for sheet to be insert-molded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an occurrence of a fault by improving a quality level of a step of an end face of a molding when the end face is directly exposed to person's sight, a short distance of sidewalls or a wrinkle of a sheet of the sidewall retained when a shape is difficult to be deflected in a circle or the like of a small diameter in a product obtained by molding and blanking a printed thermoplastic sheet to the shape, insert molding the sheet and padding the sheet. SOLUTION: The end face of the sheet is formed in an undercut state at vacuum molding, pressure molding or the like time, and an intermediate part of an undercut part is cut by a press die at a blanking time. At the vacuum molding or pressure molding time, an amount of the sheet covering a thickness of the injection molding is already expected, and a sheet shape turned in a thickness direction of the molding is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION [0002] A printed thermoplastic sheet is formed by vacuum forming or air forming, etc., formed into a punched shape by a press die, and the punched sheet is insert-molded by injection molding. It can be widely used as a method or a shape of the end face of the sheet when the meat is filled.

[0002]

2. Description of the Related Art A printed thermoplastic sheet is formed by vacuum forming or pressure forming, etc., is punched by a press die, and the punched sheet is insert-molded by injection molding to form a flesh. In many cases, the end face of the injection molded product is concealed by other parts or the like, and an assembling method or order that is not directly visible to the human is often adopted. In addition, it is possible to cover the end surface with a printed sheet by extending the sheet as in Japanese Patent Application No. 11-134627 and deflecting it in a mold, but when the cross section is special, or In some cases, such as a small-diameter circular shape, it is difficult for the sheet to bend well as a whole, resulting in an increase in defects.

[0003]

The problem to be solved is that the printed thermoplastic sheet is formed by vacuum forming, pressure forming, or the like.
Etc., molded into a punched shape with a press die, insert molding of the punched sheet by injection molding, and in the case of products that are fleshed out, in many cases,
The end face of the injection molded product is concealed by other parts, etc., and the assembly method and order that are not directly visible to the human are selected, but are limited directly by the functional reasons, appearance and other assembly, and Japanese Patent Application 11-1
When it is difficult to cover the end surface with the printed sheet by bending the sheet in a mold and deflecting it in the mold as in 34627, for example, the end surface of the molded product is not chamfered or R,
In the case of a cross-sectional shape that has a step, whether it fits on the step or below it varies, the bent side sheet remains as wrinkles, or the distance of the side wall is small Also, if it is difficult to bend the sheet of the end face portion, or if it is difficult to bend the shape of a small diameter circle or the like, the sheet on the side wall may remain as wrinkles. The purpose is to prevent the occurrence of these defects and improve the yield.

[0004]

According to the present invention, the end face of a sheet is made to be undercut in vacuum forming or pressure forming, and the intermediate portion of the undercut portion is cut when punching with a press die. . At the time of vacuum forming or pressure forming, the amount of the sheet that already covers the thickness of the injection molded product is estimated, and a sheet shape folded in the thickness direction of the injection molded product is obtained.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION At the time of vacuum forming or pressure forming, the amount of a sheet which already covers the thickness of an injection molded product is estimated, and a sheet shape folded in the thickness direction of the injection molded product is obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, there is a small-diameter and flat (16) screw portion, and a concave portion (1) is provided on the upper surface of a plastic cap which needs to be unthreaded. When the printing design of (2) is required there, since the printing is to be performed on the concave portion, the printed sheet is pressure-formed and punched out to form a sheet shape as shown in FIG. As shown in FIG. 2, the side wall of (3) of the plastic cap which needs to be unscrewed with a small diameter is flat and has no distance because it is flat, and it is impossible to deflect the side wall of (3) having a sheet shape as shown in FIG. There is also a (5) non-rotating part with a screw, which is a hole made of a plastic product, which becomes a convex part on the mold side, becomes a step-like shape, and the sheet rides here, without riding (3) Wrinkles were easily generated on the side wall of. FIG. 4 shows a defective example. (6) Wrinkles are generated on the side wall of (3).

As shown in FIG. 5, an undercut portion (7) is provided when pressure-forming a printed sheet. This is shown in FIG.
As (9) the inner knife moves upward in the figure, (4) pushes up the upper part of the sheet (11) The part where the sheet extends extends (10) until it extends along the outer knife, and finally (12) cutting 7 or (9) as shown in FIG. 7 by turning the inner cutter in such a way that the inner cutter is moved outward (10) and cutting it with the outer cutter. A sheet shape in which the sheet corresponding to the end face remains can be obtained. FIG. 8 shows a state before being inserted into a mold and subjected to insert molding. (13) The mold having the shape of the present invention in the gap between the mold, the (14) rotating core, and (5) the stopper having the (5) detent part (15), as shown in FIG. FIG. 9 is a cross-sectional perspective view of a non-defective product when injection molding resin is poured and insert molding is performed. In the embodiment, the pressure forming is used, but any forming method other than vacuum forming is possible as long as the sheet can be formed.

[0008]

According to the present invention, a printed thermoplastic sheet is formed by vacuum forming, air pressure forming, etc., formed into a punched shape by a press die, and the punched sheet is insert-molded by injection molding to form a flesh. In the case of a product that has a special cross section, or a shape with a small diameter, a circular shape, a flat shape without height, etc., it may be difficult for the sheet to bend well as a whole, leading to an increase in defects. Due to the above structure, if such a cross section is special, or if the sheet is difficult to bend well as a whole, such as a circular shape with a small diameter, a flat shape without height, etc., a good shape is used. The end face treatment became possible, and the quality was improved and the defect rate was reduced.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a sheet shape according to an embodiment of the present invention.

FIG. 2 is a sectional perspective view of a shape of an embodiment of the present invention.

FIG. 3 is a sectional perspective view of a conventional sheet shape example.

FIG. 4 is a sectional perspective view of a defective example when a conventional sheet shape is used.

FIG. 5 is a cross-sectional perspective view of an embodiment (shape after pressure forming) of the present invention.

FIG. 6 is a cross-sectional perspective view of an embodiment (when stretched and cut) of the present invention.

FIG. 7 is a sectional perspective view of an embodiment of the present invention (in the case of turning and cutting).

FIG. 8 is a cross-sectional perspective view of the embodiment of the present invention (a state in which a sheet is housed in a mold).

FIG. 9 is a sectional perspective view of an embodiment (non-defective product) of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper surface concave part 2 Printing design 3 Side wall 4 Sheet 5 Non-rotating part 6 Wrinkle 7 Undercut part 8 Sheet for end face 9 Inner blade 10 Outer blade 11 Sheet extending part 12 Cutting part 13 Cabinet 14 Rotating core 15 Stripper 16 Screw part 17 Injection molding resin

Claims (1)

[Claims] 1. A printed thermoplastic sheet is formed by vacuum forming, air forming, etc., formed into a punched shape by a press die, and the punched sheet is insert-molded by injection molding to form a flesh. In a series of processes such as this, the end face of the sheet is undercut during vacuum forming or pressure forming, so that the middle part of the undercut part is cut at the time of punching with a press die, in the thickness of the injection molded product A method and shape for processing a sheet end surface at the time of forming a sheet, characterized in that it is possible to cover the end surface of an injection molded product after injection molding by obtaining a folded sheet shape.