Process for stretching a web of material

Details Process for stretching a web of material Process for stretching a web of material

1991-08-29

1992-12-22

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

26 71, 2642902, B29C 5506

Patent

active

051732394

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.

REFERENCES:
patent: 2728941 (1956-01-01), Allis et al.
patent: 2779684 (1957-01-01), Aller
patent: 3124834 (1964-03-01), Vandierendonek
patent: 3132375 (1964-05-01), Koppehile
patent: 3172150 (1965-03-01), Dornier

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