초록 ▼

The invention concerns an apparatus for the manufacture of films, in particular thin or very thin films, with a rotating roller with which a plastically deformable film preferably supplied by a slot extruder is conveyed and stretched, wherein between the roller and a metal belt arranged parallel and

The invention concerns an apparatus for the manufacture of films, in particular thin or very thin films, with a rotating roller with which a plastically deformable film preferably supplied by a slot extruder is conveyed and stretched, wherein between the roller and a metal belt arranged parallel and at a short distance from the roller is applied a voltage by which the film supplied is applied to the roller. In order to develop this apparatus in such a way that manufacture of films, in particular thin or very thin films, is possible with increased productivity and film quality, with the invention it is proposed that the metal belt comprises a sharp longitudinal edge which is arranged closest to the roller and directed onto it.

대표청구항 ▼

[ I claim:] [1.] Apparatus for the manufacture of thin films with a rotating roller with which a plastically deformable film supplied by a slot extruder is conveyed and stretched, wherein a gap exists between the roller and a metal belt arranged parallel to the roller and a voltage is applied betwee

[ I claim:] [1.] Apparatus for the manufacture of thin films with a rotating roller with which a plastically deformable film supplied by a slot extruder is conveyed and stretched, wherein a gap exists between the roller and a metal belt arranged parallel to the roller and a voltage is applied between the metal belt and the roller, wherein the metal belt comprises a tapered region having a sharp longitudinal edge which is arranged closest to the roller and directed onto it and an unsharpened region having surfaces extending parallel to each other and wherein the tapered region at a distance of 0-100 .mu.m starting from the sharp longitudinal edge has a cross-sectional shape described by the function w/2=1/2 e.sup.A d.sup.B /25.sup.B, w being a thickness of the cross-sectional shape in .mu.m, d being a distance in .mu.m from the sharp longitudinal edge to a desired measuring point on the tapered region, e the Euler's number, and A an exponent freely selectable within the range 2.064 to 2.282 and B an exponent freely selectable within the range 0.7 to 0.86.