Process for the production of a plastic tube to be used as an ar

Details Process for the production of a plastic tube to be used as an ar Process for the production of a plastic tube to be used as an ar

1974-05-31

1976-04-13

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264177R, 264209, 264210R, 264288, 264290R, B29D 724, B29C 1702

Patent

active

039504697

ABSTRACT:
This invention relates to a process for the manufacture of a plastic tube suitable for use as a sausage casing, which comprises extruding a crystalline thermoplastic material at a temperature above its crystalline melting point through an annular die of non-uniform cross-section, to produce a tube any cross-section of which varies continuously from a maximum to a minimum, the positions of the minimum and maximum thickness being diametrically opposed, the maximum being 1.3 to 3.0 times as thick as the minimum, cooling the tube to below its crystalline melting point, biaxially orienting the tube, and longitudinally stretching the biaxially oriented tube under conditions such that the temperature of the portion of the tube of maximum thickness is greater than that of the portion of the tube of minimum thickness. The invention also relates to the tube so produced.

REFERENCES:
patent: 1654253 (1927-12-01), Henderson
patent: 2136566 (1938-11-01), Schnecko et al.
patent: 2925621 (1960-02-01), Parth
patent: 3229006 (1966-01-01), Nohl
patent: 3242531 (1966-03-01), Nohl

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