Device for flattening a film tube

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 55/28 (2006.01) B29C 47/00 (2006.01) B29C 49/28 (2006.01) B29C 53/10 (2006.01)

Patent

CA 2202823

A device for flattening a film tube taken up from an inflated film bubble extruded from the film-blowing head of a film-blowing system consisting of flattening platens delimiting the film bubble and placed against it in the form of a wedge, which are positioned in front of the squeeze rollers of a film take-up and winding device, of a driven reversing frame which holds the flattening platens, supports the squeeze rollers and supports the turning bars and, if necessary, an idle roller about its axis of rotation in pivoting fashion, and of a calibrating device arranged between the film-blowing head and flattening platens. In order to prevent disturbances and the formation of edge folds caused by the twisting of the film bubble as the film tube is flattened, the calibrating device is driven in a rotating fashion, in all cases, in the same direction of rotation as the flattening platens.

Dispositif de mise à plat d'un tube pelliculaire tiré d'une bulle pelliculaire gonflée produite par la tête d'extrusion-soufflage d'un système de soufflage de feuilles minces constitué de panneaux de mise à plat délimitant la bulle pelliculaire et placés contre elle en forme de V en face des rouleaux pinceurs d'un poste de tirage et d'enroulement, d'un châssis tournant entraîné qui retient les panneaux de mise à plat, supporte les rouleaux pinceurs et supporte les barres de détour et, au besoin, un rouleau tendeur autour de son axe de rotation en mode pivotant, et d'un dispositif de calibrage placé entre la tête d'extrusion-soufflage et les panneaux de mise à plat. Dans le but de prévenir les perturbations et la formation de plis en bordure causés par la torsion de la bulle au moment où le tube pelliculaire est mis à plat, le dispositif de calibrage est entraîné en mode rotatif, toujours dans le même sens de rotation que les panneaux de mise à plat.

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