Method of making tubular plastic film

Details Method of making tubular plastic film Method of making tubular plastic film

1973-07-12

1976-01-20

Thurlow, Jeffrey R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 95, 264209, 264210R, 264237, 264290R, B29D 2304, B29F 308

Patent

active

039339580

ABSTRACT:
Plastic film is made using a heat transfer liquid circulated through the film extrusion die to control (by either heating or cooling, as required) the temperature of the plastic melt flowing through such die. A plastic bubble emerging at the outlet of the die is inflated and ventilated by continuously circulated gas which is controlled in temperature as it enters and leaves the bubble so that it does not adversely affect the temperature of the melt in the die.

REFERENCES:
patent: 2937402 (1960-05-01), Pierce
patent: 3266092 (1966-08-01), Corbett
patent: 3321805 (1967-05-01), Given
patent: 3385917 (1968-05-01), Breukink et al.
patent: 3475789 (1969-11-01), Stroup et al.
patent: 3577488 (1971-05-01), Bigland
patent: 3769379 (1973-10-01), Hinrichs

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