Method for producing plastic sheet or film stock

Details Method for producing plastic sheet or film stock Method for producing plastic sheet or film stock

1975-04-11

1977-03-15

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

B29D 702, B29F 300

Patent

active

040124770

ABSTRACT:
Method of extruding a plastic film using a single roll which is rotatably and horizontally mounted between spaced-apart supporting members, each having curved recesses partially accommodating and encompassing opposite portions of the circumference of the roller. Molten plastic is distributed along the length of the roller, and the roller is preferably revolved to carry the molten plastic through the first recess to the second recess, whereby a substantially equal accumulation of plastic is collected in each recess and at opposite locations on the surface of the roller. The second accumulation of plastic is further located at a die aperture in the adjacent one of the two supporting members, whereby plastic from the second accumulation is extruded through the die aperture to form the sheet stock sought to be produced. The first accumulation of plastic which is squeezed between the other support member and the roller provides a force on the roller which equals and offsets the force being applied to the roller by the second accumulation of plastic, whereby the roller is protected against bending or other lateral deformation.

REFERENCES:
patent: 2586607 (1952-02-01), Brown
patent: 3007207 (1961-11-01), Salhofer
patent: 3317952 (1967-05-01), Rodenacker
patent: 3705778 (1972-12-01), Collin
patent: 3778036 (1973-12-01), Collin

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