Process for the extrusion of a plastic foil having small variati

Details Process for the extrusion of a plastic foil having small variati Process for the extrusion of a plastic foil having small variati

1975-05-20

1977-03-22

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

264 404, 264146, 264176R, 264177R, B29C 1708, B29C 2900, B29D 702, B29F 300

Patent

active

040137457

ABSTRACT:
A process for extruding a film having small variations in thickness by regulating the quantities fed to a worm press and by regulating the extrusion process. Marginal strips and waste products of extruded film are re-processed by returning these materials, slicing them and directly weighing them before being fed to the filling bin of the screw press. In order to regulate the quantities fed to the screw press, the weighed material per unit of time is continually subtracted from a nominal value set by a volume regulator associated with the raw material seeder devices. The filling degree of the screw press is measured as the mass pressure between the screw press and a constant volume pump such that the filling degree is maintained constant during the extrusion process.

REFERENCES:
patent: 3150213 (1964-09-01), Doering
patent: 3391232 (1968-07-01), Jackson
patent: 3822867 (1974-07-01), Evans

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