Method of foaming prior to injection molding

Details Method of foaming prior to injection molding Method of foaming prior to injection molding

1994-03-25

1996-05-07

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

264 50, 2643281, 264DIG69, B29C 4402

Patent

active

055143105

ABSTRACT:
An injection molding machine or extruder 10 for injecting a foamed thermoplastic material 82 into a mold 12 for forming a shaped article at a relatively low pressure. The injection molding machine comprises a barrel 20 housing a screw 22 disposed in a relatively loose clearance with respect to an inner surface 24 of the barrel. This loose clearance provides for churning a molten thermoplastic material into a foamed condition, which is then introduced into a mold. As the thermoplastic material cools, its foamed characteristic retards shrinkage of the thermoplastic material.

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