Method of molding plastic and injection compression molding appa

Details Method of molding plastic and injection compression molding appa Method of molding plastic and injection compression molding appa

1987-12-09

1989-07-18

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

2643281, 425150, 4254501, 4254519, 425589, 425595, B29C 4564

Patent

active

048491519

ABSTRACT:
A method of molding a plastic is initiated by injecting molten resin into a mold at a high pressure. The energy of the high pressure is partially stored in the form of elongation of tie bars of a molding machine. After the gate seals completely, the restoring force of the tie bars due to elastic deformation acts on the molded article as the mold article cools down. Each tie bar comprises a first member having a small modulus of elasticity and a second member. When the elongation of each tie bar is small, only the first member of small modulus of elasticity works. After the elongation reaches a certain amount of .DELTA.l.sub.1, the two members are connected parallel. As a result, the apparent modulus of elasticity of each tie bar increases rapidly. This makes it possible to mold a plastic with high dimensional accuracy.

REFERENCES:
patent: 4519763 (1985-05-01), Matsuda et al.

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