Apparatus for the production of tubular film

Details Apparatus for the production of tubular film Apparatus for the production of tubular film

1974-08-14

1976-05-04

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Continuous filament forming or film casting means with...

425 71, 425 72R, 425326R, B29C 1700

Patent

active

039543609

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 of the mandrel.

REFERENCES:
patent: 3074108 (1963-01-01), Wiley et al.
patent: 3600479 (1971-08-01), Yazawa et al.
patent: 3796781 (1974-03-01), Edwards et al.
patent: 3819776 (1974-06-01), Robinson et al.
patent: 3886243 (1975-05-01), Venura et al.

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