Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1981-06-19
1983-08-23
Parrish, John A.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
2643289, 26433111, 264334, B29F 100
Patent
active
044003412
ABSTRACT:
A method of injection molding a thermoplastic material to produce a product in a sandwich mold comprising at least two ejection ports each having a cooling cavity, and a single runner system for feeding the two cooling cavities, where each ejection port passes through a retracted period and a protracted period which together make up its production cycle, where the retracted period comprises an injection period and a cooling period and where the protracted period comprises an opening period, an extended period or point in time, and a closing period, the method comprising the step of desynchronizing the opening, extended and closing periods of a first ejection port with the respective opening extended and closing periods of a second ejection port.
REFERENCES:
patent: 3669601 (1972-06-01), Lainesse
patent: 3707342 (1972-12-01), Lohman
patent: 3973892 (1976-08-01), Rees
patent: 4005964 (1977-02-01), Bishop
patent: 4146600 (1979-03-01), Elly et al.
Parrish John A.
Universal Commerce and Finance N.V.
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