Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1983-03-03
1984-08-07
Parrish, John
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
044643276
ABSTRACT:
A method of cyclic injection molding a thermoplastic material, utilizing a combination of a sandwich mold and an injection unit which together encompass a bifurcated feed system with a molten core. The feed system includes a channel system encompassed by the injection unit and a runner system encompassed by the sandwich mold. The feed system defines a first branch for feeding a first cooling cavity encompassed by a first parting surface, and a second branch for feeding a second cooling cavity encompassed by a second parting surface. Each cooling cavity passes through a retracted period and a protracted period which together make up its production cycle. The retracted period includes an injection period and a cooling period. The protracted period includes an opening period and a closing period. The method is characterized by the step of desynchronizing the injection period of the first cooling cavity with the injection period of the second cooling cavity.
REFERENCES:
patent: 2698460 (1955-01-01), Amo
patent: 2992455 (1961-07-01), Salzmon
patent: 3647338 (1972-03-01), Ise
patent: 3659997 (1972-05-01), Rees
patent: 3663145 (1972-05-01), Teraoka
patent: 3669601 (1972-06-01), Lainesse
patent: 3723040 (1973-03-01), Rees
patent: 3973892 (1976-08-01), Rees
patent: 4400341 (1983-08-01), Sorensen
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