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Title: US5051225: Method of drawing plastic film in a tenter frame
[ Derwent Title ]


Country: US United States of America

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47 pages

 
Inventor: Hommes, William J.; Hockessin, DE
Keegan, Jr., John J.; Wilmington, DE

Assignee: E. I. Du Pont de Nemours and Company, Wilmington, DE
other patents from E. I. DU PONT DE NEMOURS AND COMPANY (165265) (approx. 15,067)
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Published / Filed: 1991-09-24 / 1988-06-22

Application Number: US1988000209910

IPC Code: Advanced: B29C 55/04; B29C 55/16; B29C 55/20; B65H 23/032; B29L 7/00;
Subclass: B29C;
IPC-7:
B29C 55/20
;
B65G 35/08;
H02K 41/02;

ECLA Code: B29C55/16B; B29C55/20;

U.S. Class: Current: 264/288.4; 198/619; 264/290.2;
Original: 264/288.4; 198/619; 264/290.2;

Field of Search: 264/288.4,290.2 026/073,93 198/805,619

Priority Number:
1988-06-22  US1988000209910

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.

Primary / Asst. Examiners: Lowe, James;

Maintenance Status: E3 Expired  Check current status

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Designated Country: AT BE CH DE FR GB IT LI LU NL SE  AU BR DK EP FI JP KR NO SU 

Family: Show 23 known family members

First Claim:
Show all 7 claims
We claim:     1. A method of drawing plastic film in a tenter frame, including the steps of:
  • propelling active carriages with tenter clips attached thereto, in opposed loops, in paired symmetry, at predetermined speeds, in a film processing section of the tenter frame, to draw the film;
  • forming stacks of carriages; and
  • propelling the stacks of carriages in carriage collection sections prior to entering the film processing section of the tenter frame
  • wherein the film is gripped by the tenter clips in the film processing section and
  • wherein synchronous motors are used to propel the active carriages in the film processing section to draw the film;
  • wherein at least one passive carriage is positioned between the active carriages in each loop and wherein such passive carriages are unpowered during the film drawing step; and
  • wherein the tenter clips release the film after the film drawing step and
  • wherein the active and passive carriages are propelled in and through stack forming sections after the film is released by the tenter clips and into the stacks of carriages using hysteresis motors.


Background / Summary: Show background / summary

Drawing Descriptions: Show drawing descriptions

Description: Show description

Forward References: Show 37 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (37)   |   Backward references (6)   |   Citation Link

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PDF
Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 6pp US3150433  1964-09 Kampf   Stretching machine
Get PDF - 5pp US3256558* 1966-08 Andersen et al.    
Get PDF - 37pp US3803466  1974-04 Starkey  Rockwell International Corporation LINEAR MOTOR PROPULSION SYSTEM
Get PDF - 9pp US3890421  1975-06 Habozit  La Cellophane Method for biaxially drawing plastic films
Get PDF - 10pp US3932919  1976-01 Hutzenlaub et al.  Erwin Kampf Maschinenfabrik Improved gripper return means for a machine for simultaneously biaxially stretching thermoplastic film
Get PDF - 23pp US4825111  1989-04 Hommes et al.  E. I. Du Pont de Nemours and Company Linear motor propulsion system
  * some details unavailable
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Buy PDF FR2317076 1977-02  B29C 55/16 CELLOPHANE SA DISPOSITIF AMELIORE D'ETIRAGE DES FILMS DE MATIERE PLASTIQUE 
  JP48038779 1973-10       


Other Abstract Info: DERABS C90-022449

Other References:
  • 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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