Injection molding

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles

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Details

2642978, 2643287, 2643288, 2643289, 26432811, 26432812, 26432813, B29C 4500

Patent

active

059222662

ABSTRACT:
Method and apparatus for forming an article having a prescribed volume and mass from a molten plasticized resin using an injection molding machine by (a) forming an oversized mold cavity with respect to an opposing pair of relatively movable mold members between which the article is formed; (b) injecting into the oversized mold cavity a volume of plasticized resin exceeding the prescribed volume of the article and having a mass at least equal to the prescribed mass of the article; (c) applying force to the mold members to reduce the volume of the cavity and pressurize the plasticized resin therein simultaneously with the injection of resin.

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