Production of tubular film

Details Production of tubular film Production of tubular film

1976-02-13

1977-12-13

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264209, 264210R, 264237, 264290R, 4253261, 425532, B29D 2304

Patent

active

040629163

ABSTRACT:
Internal mandrel process and apparatus for the production of oriented tubular film in which rupture of the extruded tube by the pressure of inflating gas is prevented by means of a cup seal located between the mandrel and inflating zone, the cup seal being in peripheral engagement with the internal surface of the tube and presenting a substantially concave surface to the mandrel.

REFERENCES:
patent: 3142092 (1964-07-01), Ralston
patent: 3412189 (1968-11-01), Sullivan
patent: 3796781 (1974-03-01), Edwards et al.
patent: 3819776 (1974-06-01), Robinson
patent: 3857917 (1974-12-01), Reade

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