Process to obtain molecular orientations in perforated plates ma

Details Process to obtain molecular orientations in perforated plates ma Process to obtain molecular orientations in perforated plates ma

1987-04-15

1989-02-28

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

2642105, 2642107, 2642356, 2642358, 264237, 2642888, 2642893, 2642902, 264346, 264348, 264DIG70, 264DIG73, 264DIG81, 425 66, 425290, 425297, 425404, B29C 5504, B29C 5514

Patent

active

048083585

ABSTRACT:
A process to obtain molecular orientations in perforated plates made of extruded plastic material includes a first heating of the plastic material at an extrusion temperature, the extruding of the plastic material in the form of a perforated plate, a first cooling of said plate, a second heating of the plate at the longitudinal orientation temperature, the longitudinal stretching of the plate, a second cooling of the plate at a temperature approaching room temperature, a third heating of the plate at the longitudinal stabilization temperature, a third cooling of the plate, a fourth heating of the plate at the transverse orientation temperature, the transverse stretching of the plate, a fourth cooling of the plate at the transverse stabilization temperature, and the final cooling of the plate.

REFERENCES:
patent: 3085292 (1963-04-01), Kindseth
patent: 3387069 (1968-06-01), Stohr
patent: 3817671 (1974-06-01), Lemelson
patent: 4093695 (1978-06-01), Heirbaut
patent: 4140826 (1979-02-01), Liu
patent: 4470942 (1984-09-01), Beretta
patent: 4536429 (1985-08-01), Mercer
patent: 4574100 (1986-03-01), Mercer
patent: 4618385 (1986-10-01), Mercer

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