Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1972-07-24
1976-09-21
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
264175, 264210R, 264284, 264288, 264289, 264DIG47, B32B 310, B32B 502
Patent
active
039819523
ABSTRACT:
Disclosed is a process for treating a travelling film made from a molecularly-orientable synthetic thermoplastic organic polymer, according to which the film while in an unoriented condition and a molten deformable state has at least one of its sides modified so as to have a homogeneous series of high frequency discrete protuberances or depressions. This is achieved by subjecting the film to the action of an appropriately contoured surface. The frequency is at least of the order of 100 per inch. The center line average height of the protuberances or depressions is preferably from 1 to 10 microns. The process is advantageously used for making, inter alia, weaving tapes, twine and fibrous materials.
Also disclosed is apparatus for carrying out such a process. In a preferred form it comprises an extruder, a pair of nip rollers, at least one of which has an appropriately contoured surface, and a hot drawing means. Also disclosed are versions including slitting means and fibrillating means.
REFERENCES:
patent: 3199284 (1965-08-01), Scragg
patent: 3387077 (1968-06-01), Sammons et al.
patent: 3398220 (1968-08-01), Port et al.
patent: 3500627 (1970-03-01), Kim
patent: 3724198 (1973-04-01), Kim
patent: 3746607 (1973-07-01), Harmon et al.
McMeekin Samuel
Ruddell James Nelson
Lambeg Industrial Research Association
Levine Alan H.
Thurlow Jeffery R.
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