Method and device for the transverse drawing of a material web
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United States of America Patent
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Nov 10, 2015
Grant Date -
Jul 3, 2008
app pub date -
May 9, 2006
filing date -
May 10, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a method for the transverse drawing of an unoriented or longitudinally-oriented film web made from thermoplastic plastic. According to said method, an undrawn or longitudinally-drawn film (8) is introduced into a transverse drawing frame in which heater fields (1) are heated to a transverse drawing temperature TQ, in the attached drawing fields (2) a clip chain is drawn in the transverse direction by divergent (V-shaped) guides and a temperature TF is applied to fixing fields where TQ>TF. In the drawing fields and/or the heating fields (1) the boundary zones (5) of the film (8) are heated or thermally insulated such 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.
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