Mold for making synthetic resin molded foam and molding process

Details Mold for making synthetic resin molded foam and molding process Mold for making synthetic resin molded foam and molding process

1997-10-03

1999-10-12

Kuhns, Allan R.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

425812, 425817R, B29C 4458

Patent

active

059651695

ABSTRACT:
A mold for foam molding a material for a synthetic resin molded foam, includes a mold main body having: a lower mold half; an upper mold half removably disposed on the lower mold half in such a manner as to cover an opening portion of the lower mold half for forming an enclosed space therebetween; and a middle mold part removably disposed in the enclosed space. In the mold main body, a plurality of spacers, spaced from each other in the circumferential direction, are provided between the middle mold part and the upper mold half; chambers, partitioned from each other by the spacers, are formed between the upper surface of the middle mold part and the lower surface of the lower mold half; and a cavity communicated to the chambers through gaps between the spacers and through a micro-gap formed between the middle mold part and the lower mold half, is formed between the middle mold part and the lower mold half, wherein a synthetic resin foam molding material is supplied into the cavity. The mold also includes a pressure adjusting device for depressurizing the interior of the chambers by evacuating air in the chambers. In this mold, when the air in the chambers is evacuated, air in the cavity is simultaneously evacuated through the gaps between the spacers and the micro-gap between the middle mold part and the lower mold half.

REFERENCES:
patent: 4501541 (1985-02-01), Bethell et al.
patent: 4793784 (1988-12-01), Belleville et al.
patent: 4793793 (1988-12-01), Swenson et al.
patent: 4973235 (1990-11-01), Shoji
patent: 5007815 (1991-04-01), Shoji
patent: 5011394 (1991-04-01), Katagiri et al.
patent: 5098271 (1992-03-01), Yanagishita
patent: 5723152 (1998-03-01), Hirata et al.

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