Apparatus for stretching a web of material
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 predeterm...
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Main Authors | , , |
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Format | Patent |
Language | English |
Published |
18.10.1994
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | 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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Bibliography: | Application Number: US19930096208 |