PROCESS FOR PRODUCING POLYAMIDE RESIN FILM AND POLYAMIDE RESIN FILM OBTAINED BY THE PROCESS
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United States of America Patent
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Issued Date -
Sep 2, 2010
app pub date -
Nov 7, 2008
filing date -
Nov 8, 2007
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Abstract
Disclosed is a process for producing a polyamide resin film, wherein in a simultaneous biaxial tenter stretching method for simultaneously biaxially, longitudinally and transversely, stretching an unstretched film by gripping the widthwise edges of the unstretched film with clips, from the start of the transverse stretching until the maximum stretching magnification factor of the transverse stretching is reached, the longitudinal stretching magnification factor represented by the linear distance between the adjacent clips is prevented from being decreased by 5% or more of the maximum stretching magnification factor of the longitudinal stretching.
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