Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Including surface treatment of porous body
Patent
1989-01-23
1990-06-05
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Including surface treatment of porous body
264564, 264146, 2642092, 2642098, 425 4C, 425197, 425380, 425467, 425817C, B29C 4720
Patent
active
049312375
ABSTRACT:
An apparatus and process for producing tubular film from thermoplastic molten material including a tubular housing having an axially-aligned interior defined inner surface, an elongated member including an outer surface disposed within the inner surface of the housing and spaced therefrom providing a passageway, and an alignment member having a plurality of annularly-spaced feed ports defining an inside surface, the alignment member securely connecting the elongated member to the housing, wherein the inner surface of the housing, the outer surface of the elongated member and the plurality of annularly-spaced feed ports define an annular-axially aligned passageway for allowing a balanced flow of thermoplastic material therethrough.
REFERENCES:
patent: 3609809 (1971-10-01), Slicker
patent: 3809515 (1974-05-01), Farrell
patent: 3899276 (1975-08-01), Sokolow
patent: 3932102 (1976-01-01), Rosenbaum
patent: 3963403 (1976-06-01), Hughes et al.
patent: 4173446 (1979-11-01), Larsen
patent: 4402898 (1983-09-01), Rosenbaum
Malosh Edward A.
Peelman Paul L.
Amoco Corporation
Cunningham Gary J.
Magidson William H.
Medhurst Ralph C.
Thurlow Jeffery
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