Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1976-09-22
1978-08-08
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
264177R, 264178R, 425 71, 425376R, 425461, B28B 2154
Patent
active
041057287
ABSTRACT:
Films are formed from liquid polymeric material passed through an elongate exit slit of a die and drawn to a solidification region. A condition of flow of liquid through the slit is established to enforce a controlled ratio of extensional strain rate to shear strain rate on the material leaving the slit by providing a predetermined slit profile to maintain that ratio above a minimum throughout the width of the film.
REFERENCES:
patent: 2168288 (1939-08-01), Fischer
patent: 4015926 (1977-04-01), Nehres
Celanese Corporation
Woo Jay H.
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