Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1994-10-11
1995-12-26
Heitbrink, Tim
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
425562, 425564, B29C 4523
Patent
active
054785200
ABSTRACT:
A process and apparatus for effecting injection molding of plastic resin products on an injection molding apparatus including a metal mold composed of a slidable mold element and a fixed mold element defining together the mold cavity, an actuator for sliding the slidable mold element and an injection nozzle for adjusting the nozzle flow path section, which comprises a first molding step of injecting a molten resin into the mold cavity which has been preset by the slidable mold element so as to include a post-compression margin to be compressed afterwards in a second molding step, to effect the injection under a reduced molding pressure, while causing a temperature elevation and, thus, a viscosity reduction of the molten resin, until the mold cavity has been filled up, and a second molding step of compressing the resin so charged in the mold cavity by operating the slidable mold element to compress the charged resin to compensate the post-compression margin, so as to allow an effective pressing force to be imposed onto the charged resin within the mold cavity also after the gate has been sealed.
REFERENCES:
patent: 4164531 (1979-08-01), Shiraki et al.
patent: 4519763 (1985-05-01), Matsuda et al.
patent: 5030076 (1991-07-01), Ebenhofer et al.
Kasai Masayoshi
Kubota Kouji
Kuroda Hideo
Shikase Yoshio
Tamura Yukio
Heitbrink Tim
Mitsubishi Jukogyo Kabushiki Kaisha
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