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 Title: |
US5051225:
Method of drawing plastic film in a tenter frame
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Hommes, William J.; Hockessin, DE
Keegan, Jr., John J.; Wilmington, DE
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| 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
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| Application Number: |
US1988000209910
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| 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;
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| ECLA Code: |
B29C55/16B; B29C55/20;
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| U.S. Class: |
Current:
264/288.4;
198/619;
264/290.2;
Original:
264/288.4;
198/619;
264/290.2;
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| Field of Search: |
264/288.4,290.2
026/073,93
198/805,619
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| Priority Number: |
| 1988-06-22 |
US1988000209910 |
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| 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.
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| Primary / Asst. Examiners: |
Lowe, James;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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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
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| Family: |
Show 23 known family members
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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.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 35 U.S. patent(s) that reference this one
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