Apparatus for stretching a web of material

Details Apparatus for stretching a web of material Apparatus for stretching a web of material

1993-07-23

1994-10-18

Crowder, Clifford D.

Textiles: cloth finishing

Expanding device for textile webs

Spreader

26 93, 26 88, D06C 304, B65H 23028

Patent

active

053555643

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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patent: 4637103 (1987-01-01), Hutzenlaub
patent: 4918796 (1990-04-01), Gresens
patent: 5036780 (1991-08-01), Krowatachek

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