Apparatus for stretching a web of material
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United States of America Patent
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Oct 18, 1994
Issued Date -
N/A
app pub date -
Jul 23, 1993
filing date -
Aug 29, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for longitudinally stretching a polymeric film having thickened longitudinal edges while the film is constrained in the lateral dimension by a plurality of successive pairs of grippers, the improvement comprising first guiding the film with a first group of gripper pairs having a predetermined clearance therebetween; and then gripping the film with a second group of gripper pairs with a predetermined amount of force. An apparatus for use in the process is also disclosed.
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