Process for the manufacturing of a mechanically conditioned ther

Details Process for the manufacturing of a mechanically conditioned ther Process for the manufacturing of a mechanically conditioned ther

1991-07-15

1993-07-06

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264557, 264558, 264559, 264560, 264562, 264566, 264570, 2642888, 2642896, 2642902, 264342RE, B29C 5528

Patent

active

052251390

ABSTRACT:
A process of expanding plastics film is disclosed, together with an apparatus for performing that process, in which expansion of the plastics film is performed under the control of a liquid providing a stable hydraulic mass, by the downward extrusion and drawing of the plastics film, and the final expansion thereof, exclusively under the influence of the static and dynamic pressure of a hydraulic mass, at a position spaced downwardly of the extrusion head, the hydraulic mass being one that remains in a liquid phase at all temperatures encountered during the step of lateral stretching of the plastics film, to the exclusion of vaporization of the hydraulic mass.

REFERENCES:
patent: 2337927 (1943-12-01), Reichel
patent: 2804642 (1957-09-01), Milne
patent: 2897547 (1959-08-01), Weingand
patent: 2979777 (1961-04-01), Goldman
patent: 3340338 (1967-09-01), Meissner
patent: 3426113 (1969-02-01), Yazawa
patent: 3822333 (1974-07-01), Haruta et al.

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