DEVICE FOR STRETCHING A FILM CONSISTING OF A SYNTHETIC MATERIAL IN THE TRANSVERSE DIRECTION AND IN THE LONGITUDINAL DIRECTION

摘要

The invention relates to a device comprising an oven, clips (12) arranged in such a way as to grip the film (2) on the longitudinal edges thereof, two rails (13) arranged in such a way as to guide the clips (12), and chains (14) arranged in such a way as to drive the clips (12) along the rails (13). Each rail (13) comprises a guiding portion (22) that has a crank in a region of the device (11). Each chain (14) alternately comprises links (15) of a first type and links (16) of a second type. The links (15) of the first type have holding means arranged such as to be held on the guiding portion (22) in such a way as to apply a holding force to the corresponding link (15) in a first region (19). The crank of the guiding portion enables a reduction of the force in the second region in order to deform the chain (14) so as to increase the chain pitch.