Method of drawing plastic film in a tenter frame

Details Method of drawing plastic film in a tenter frame Method of drawing plastic film in a tenter frame

1988-06-22

1991-09-24

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

198619, 2642902, B29C 5520, B65G 3508, H02K 4102

Patent

active

050512250

ABSTRACT:
Apparatus and method for producing a novel drawn film by propelling individual carriages along opposed loops from a first speed abutted in stacks in carriage collection sections to a second speed space apart in a drawing section of a tenter frame and to a third speed in stack forming sections where the carriages return to the first speed in the stacks. First primaries positioned adjacent one part of each loop develop electromagnetic waves for engaging synchronous secondaries attached to active carriages to provide controlled spacing of such carriages, and second primaries adjacent another part of the loop develop other electromagnetic waves for engaging hysteresis secondaries attached to active and to passive carriages to provide controlled abutting of the carriages.

REFERENCES:
patent: 3150433 (1964-09-01), Kampf
patent: 3256558 (1966-08-01), Andersen et al.
patent: 3803466 (1974-04-01), Starkey
patent: 3890421 (1975-06-01), Habozit
patent: 3932919 (1976-01-01), Hutzenlaub et al.
patent: 4825111 (1989-04-01), Hommes et al.
Article from the 28th IEEE Vehicular Technology Conference, Denver, Colo., Mar. 22-24, 1978, entitled, "The Evolution of a Linear Induction Motor People Mover System" by William Watkins and Mel Black, WED Enterprises, Walt Disney Productions.

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