B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/39
B31B 37/00 (2006.01) B29C 53/10 (2006.01)
Patent
CA 1246919
ABSTRACT APPARATUS FOR GUSSETING TUBULAR PLASTIC FILMS In the production of blown films, a tubular film is withdrawn from an inflated tubular film and is flattened between flattening plates, which define a wedge- shaped gap between them. Thereafter the tubular film moves between pinch rollers to means for taking off and winding the film. Folding elements for gusseting the tubular film which has been withdrawn are provided in the mutually opposite open areas between the flattening plates substantially in the center plane and for an adjustment of the depth of the gussets are reciprocable in the axial direction of the tubular film. To permit the tubular film to be gusseted in such a manner that their outer edges assume a predetermined, desired position in the flattened tubular film even under disturbing influences, sensors are provided for detecting the location of the outer fold lines of the gussets formed in the tubular film. Adjacent to those ends which are the forward ends in the direction of travel of the tubular film, the folding elements are mounted to be pivotally movable in all directions or are guided to be transversely displaceable. Adjacent to their mutually opposite, rear ends the folding elements are provided with adjusting means for imparting to said rear ends a pivotal movement which is transverse to the direction in which the depth of the gussets is adjusted and/or about their longitudinal axes in dependence on the measured deviation of the outer fold lines from their desired position.
496237
Marks & Clerk
Windmoller & Holscher
LandOfFree
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