Apparatus and method of forming a continuous layer of thermoplas

Details Apparatus and method of forming a continuous layer of thermoplas Apparatus and method of forming a continuous layer of thermoplas

1989-09-15

1991-01-29

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264216, 425224, B29C 4788

Patent

active

049884719

ABSTRACT:
In a cast film process, a thin sheet of semi-molten resin is extruded from a die and directed onto a rotating cylinder such that the transverse length of the sheet and the rotational axis of the cylinder are parallel to one another. During this stage of the process, it is desired to prevent air from entering and subsequently being trapped between the film and the casting surface of the rotating cylinder. Ultimately, entrapped air results in localized film distortion and non-uniform heat dissipation from the film. The cast film process employs an air deflector to deflect this laminar air flow layer which is entrained with the surface of the rotating cylinder before it can be forced between the casting surface and the film. The elimination or substantial reduction of the tangential velocity of the entrained air layer provides more uniform adherence of the extruded film to the casting surface.

REFERENCES:
patent: 2965927 (1960-12-01), Crosby et al.
patent: 3121915 (1964-02-01), Heller, Jr.
patent: 3154608 (1919-10-01), Aronsen
patent: 3347962 (1967-10-01), Dieck et al.
patent: 3579734 (1971-05-01), Mehta
patent: 3733711 (1973-05-01), Haythornthwaite
patent: 4034905 (1977-07-01), Lansmich
patent: 4038354 (1977-07-01), Remmington et al.

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