Method for extrusion of tubular films

Details Method for extrusion of tubular films Method for extrusion of tubular films

1979-12-19

1981-09-15

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264173, 4253261, B29D 724

Patent

active

042897270

ABSTRACT:
The present invention relates to a method for the extrusion of tubular thermoplastic films, in particular films produced from polymers such as high density polyethylene, polypropylene, and the like. The method comprises coextrusion of the polymer in the form of a tube which has adhered to its surface, another polymer which is characterized by having a significantly higher melting point than the melting point of the first polymer tube. The tubular films produced in this manner exhibit improved physical properties including a reduced tendency for rupturing or splitting in the machine direction when stresses are applied to such films.

REFERENCES:
patent: 3322870 (1967-05-01), Sacks
patent: 3337665 (1967-08-01), Underwood et al.
patent: 3467565 (1969-09-01), Utz
patent: 3819792 (1974-06-01), Ono et al.
patent: 3949042 (1976-04-01), Utz
patent: 3980744 (1976-09-01), Cogswell
patent: 3997383 (1976-12-01), Bieler et al.
patent: 4048428 (1977-09-01), Baird, Jr. et al.

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