Screw in-line type injection molding method and apparatus for lo

Details Screw in-line type injection molding method and apparatus for lo Screw in-line type injection molding method and apparatus for lo

1980-03-31

1982-12-28

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

B29F 106

Patent

active

043661106

ABSTRACT:
A low-pressure screw in-line type injection molding method and apparatus for use with materials such as urea mixed resin powder are disclosed. The initial injection is performed at a converted injection pressure in the range of 250-700 Kg/cm.sup.2 and at an injection velocity in the range of 30-50 mm/sec. when the mold cavity has become nearly completely filled, the converted injection pressure is lowered to 50-200 Kg/cm.sup.2 for the completion of the injection cycle under low pressure conditions.

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