Apparatus for drawing plastic film in a tenter frame

Details Apparatus for drawing plastic film in a tenter frame Apparatus for drawing plastic film in a tenter frame

1990-11-13

1991-12-17

Schroeder, Werner H.

Textiles: cloth finishing

Expanding device for textile webs

Biaxial expansion

D06C 308

Patent

active

050724932

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: 2698967 (1955-01-01), Reichel
patent: 3148409 (1964-09-01), Bruckner
patent: 3150433 (1964-09-01), Kampf
patent: 3261903 (1966-07-01), Carr
patent: 3803466 (1974-04-01), Starkey
patent: 3890421 (1975-06-01), Habozit
patent: 3916491 (1975-11-01), Kampf
patent: 3930098 (1975-12-01), Araki et al.
patent: 3932919 (1976-01-01), Hutzenlaub
patent: 4384392 (1983-05-01), Allen
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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