Method and apparatus for stretching thermoplastic films

Details Method and apparatus for stretching thermoplastic films Method and apparatus for stretching thermoplastic films

1989-08-10

1991-05-21

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

26106, B29C 5506

Patent

active

050173235

ABSTRACT:
A method of and apparatus for continuously stretching a thermoplastic web comprises the steps of feeding the thermoplastic web longitudinally to a heating chamber at a relatively low input speed, engaging the thermoplastic web in the heating chamber with a first member with a relatively low sliding friction between the web and the first member and engaging the thermoplastic web in the heating chamber with a second member spaced longitudinally downstream from the first roller with a relatively high sliding friction between the web and the second member. The thermoplastic web is pulled off the second member in a downstream stretch of the web at a relatively high stretching speed and the web is heated in the chamber to a temperature sufficient to substantially prevent plastic-deformation stretching of the web upstream of the second member.

REFERENCES:
patent: 3257490 (1966-06-01), Hovermale et al.
patent: 3351697 (1967-11-01), Hufnagel et al.

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