Patent ID: 8092731
Filing Date: 2012-01-10
Classification: B29C,B29K

Abstract:
1. A process for production of a foil, comprising: (A) melting a thermoplastic in an extrusion system to obtain a melt, the extrusion system comprising (B) conveying the melt onward through the discharge orifice of the extrusion die, to yield a melt web in the form of a sheet; and (C) applying the melt web to the cooled roll (chill roll) and thereby cooling the melt web, to obtain the foil, wherein the foil comprises the thermoplastic, wherein a distance between the discharge orifice of the extrusion die and the surface of the cooled roll (chill roll) varies by not more than +/−50 μm as a function of time in operating condition, wherein the roll frame has a direct, solid connection, which is moveable, to the extrusion die, and the connection comprises at least two actuators situated between the roll frame and the extrusion die, and wherein the actuators are situated completely between the roll frame and the extrusion die.