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AssigneeDynamit Nobel Aktiengesellschaft
InventorsHans Brinkmann, Gottfried Eisele, Helmut Gormar, Horst Pabst, Helmut Putz, Hans Jurgen Schrick, Uwe Sommermeyer
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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.
A process for extruding a film from materials including virgin polymer and returned scrap, said film having small variations in thickness, comprising:
Dependencies are inferred from the claim text.