Apparatus for molding polymeric materials

Plastic article or earthenware shaping or treating: apparatus – Press forming apparatus having opposed press members – Male shaping member and female mold

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425447, 4254512, 264294, B29C 300

Patent

active

040652440

ABSTRACT:
A process of molding polymeric material comprising causing heated polymeric material to flow in a predetermined direction in a mold and cooling the polymeric material forming a product exhibiting anisotropic properties including greater stiffness in the direction of flow than in any other direction. Also molding apparatus comprising two mold parts each having a mold cavity, the molding apparatus being so constructed and arranged that communication between the two mold cavities may be established and disestablished at will, means for admitting material to be molded into one of the mold cavities and by pressure differential causing flow of some of the material from said mold cavity into the other mold cavity when communication between the mold cavities is established, and means for cooling the flowing material whereby a product exhibiting anisotropic properties including greater stiffness in the direction of flow than in any other direction may be formed.

REFERENCES:
patent: 3166617 (1965-01-01), Munk
patent: 3430797 (1969-03-01), Goins
patent: 3483288 (1969-12-01), Paulson
patent: 3492387 (1970-01-01), Larson
patent: 3739052 (1973-06-01), Ayres et al.
patent: 3750450 (1973-08-01), Sharp et al.

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