Method and Device for the Transverse Drawing of a Material Web

Method for the transverse drawing of an unoriented or longitudinally oriented film web made from thermoplastic plastic, in which an undrawn or longitudinally drawn film (6) is introduced into a transverse drawing frame, wherein the transverse drawing frame includes heater fields (1), drawing fields (2) and fixing fields (3), and the film (8) is gripped at the beginning of the first heater field on both edges (4) by the clips (7) of a clip chain and heated in the heater fields (1) to a transverse drawing temperature TQ, and the film (8) is drawn in the subsequent drawing fields (2) by divergent (V-shaped) guiding of the clip chain in the transverse direction and subjected to a temperature TF in the fixing fields (3) where TQ>TF, characterised in that the boundary zones (5) of the film (8) are heated or thermally insulated in the drawing fields (2) and/or in the fixing fields (3) in such a way that the boundary zones (5) of the film (8) have a higher temperature than the middle of the film web (6) on transverse drawing and/or fixing.