Dai Nippon Printing Co., Ltd.

Kazushi Miyazawa

Hiroyuki Atake

Keiji Hanamoto

Takashi Matano

Kazuhisa Kobayashi

Takashi Tarutani

Shinpei Oono

In the method, after the pattern-bearing film is fed to the female mold, the distal end of the film is fixed under a lower portion of the female mold, and at the same time the film is retreated by a force from the film supply portion. Thus, this tightens up the film so that the slacks or wrinkles cannot be formed on the film. Therefore, the film can be fortunately spread around the parting surface of the female mold. In the apparatus, the film suppressing frame is pressed to the female mold through the sliding rod arranged in the female mold, in such a manner that the female mold embraces the frame. Thus, the pressing of the frame is performed by a simple structure, and the film is accurately positioned to the internal surface of the female mold. Also, the film suppressing frame is constituted to advance from and retreat to the female mold. Thus, this causes a space between the both molds and an outside standby position to be useless. A space around the apparatus can be effectively utilized.

Apparatus for forming pattern onto article during injection molding

In the method, after the pattern-bearing film is fed to the female mold, the distal end of the film is fixed under a lower portion of the female mold, and at the same time the film is retreated by a force from the film supply portion. Thus, this tightens up the film so that the slacks or wrinkles cannot be formed on the film. Therefore, the film can be fortunately spread around the parting surface of the female mold. In the apparatus, the film suppressing frame is pressed to the female mold through the sliding rod arranged in the female mold, in such a manner that the female mold embraces the frame. Thus, the pressing of the frame is performed by a simple structure, and the film is accurately positioned to the internal surface of the female mold Also, the film suppressing frame is constituted to advance from and retreat to the female mold. Thus, this causes a space between the both molds and an outside standby position to be useless. A space around the apparatus can be effectively utilized.

Method for forming a pattern onto an article during injection molding

A simultaneous injection molding and patterning method, including the steps of providing a first mold and a mutually opposed second mold; interposing a decorative pattern sheet between the molds; moving a heating body from a non-heating position to a heating position so as to heat and soften a portion of the decorative pattern sheet positioned between the opposing molds. The heating position is arranged such that a heating surface of the heating body confronts the decorative pattern sheet while the sheet is positioned between the opposed molds, and the non-heating position is arranged such that the heating surface of the heating body is not parallel to the heating surface of the heating body when in the heating position. The first mold is then evacuated to bring the heated and softened decorative pattern sheet into contact with a cavity of the first mold, the molds are closed, and then molten resin is injected into the mold to form a patterned product including the decorative pattern sheet.

Simultaneous injection molding and patterning method using heating body

A heating device used for a simultaneous injection molding and patterning method such that: a decorative pattern sheet is disposed between a pair of mutually opposed molds (mold A formed with a vent and mold B formed with an injection gate); the decorative pattern sheet is heated and softened by the heating device; the decorative pattern sheet is brought into tight contact with a cavity surface of mold A on the basis of a pressure difference caused by exhaustion of mold A through the vent; and a molten resin is injected into the molds through the injection gate to mold a product patterned on the basis of the decorative pattern sheet. The heating device includes: a heating body for supplying heat to the decorative pattern sheet; and heating body moving members for moving the heating body between a heating position at which the heating body is confronted with the decorative pattern sheet to heat and soften the decorative pattern sheet and a non-heating position at which the heating body is moved away from a space between a pair of the molds. The heating position of a heating surface of the heating body is not parallel to the non-heating position of the heating surface of the heating body. Since the positional relationship of the heating surface of the heating body is non-parallel at the heating positions, it is possible to markedly reduce the installation space of the apparatus.

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Tokyo-to, Japan

Kazushi Miyazawa