US4038121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of thermoplastic films
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-10-14
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Granted: 1977-07-26
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Expires: 1995-10-14
Abstract
Abstract The invention is a method of automatically threading the wind-up section while the formation section runs at full speed. The stopped wind-up section is threaded with a leader while the formation section runs at full speed. The wind-up section is started. When speeds match the two webs are spliced, the leader is fed from its feed and the production web from waste so that the leader draws the production web through the wind-up section. The splicer may also act as an automatic dump.
Inventors
- 👤 Nigel Colin Benson
- 👤 John Dorab Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:29
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/32; B29C48/00; B29C48/03; B29C48/07; B29C48/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A method of threading a thermoplastic film, issuing from a web-formation section of a production line, through a wind-up section when the production line is re-started after a stoppage or after the wind-up section has become unthreaded due to a malfunction in the web formation section, said method comprising: (a) running the formation section and feeding the moving production web to waste while simultaneously threading a leader through the wind-up section while the latter is stopped, (b) starting the wind-up section so as to begin winding up the leader and matching the speed of the wind-up section to that of the formation section, and (c) then joining the moving leader to the moving production web at a location upstream of the windup section so that the production web is threaded through the wind-up section by the leader.
Claim 2
Independent Claim
137 words
A method of threading a thermoplastic film, issuing from a web-formation section of a production line, through a wind-up section when the production line is re-started after a stoppage or after the wind-up section has become unthreaded due to a malfunction in the web formation section, said method comprising: (a) running the formation section and feeding the moving production web to waste while simultaneously threading a leader through the wind-up section while the latter is stopped, (b) starting the wind-up section so as to begin winding up the leader and matching the speed of the wind-up section to that of the formation section, and (c) then joining the moving leader to the moving production web at a location upstream of the windup section so that the production web is threaded through the wind-up section by the leader.
Claim 3
Dependent Claim
39 words
A method according to claim 1, in which stage (c) is carried out in the following order: (i) joining the leader to the production web, (ii) severing the production web from waste and severing the leader from its feed.
Claim 4
Dependent Claim
28 words
A method according to claim 1 in which the leader is severed from its feed after the production web is threaded through the whole of the wind-up section.
Claim 5
Dependent Claim
34 words
A method according to claim 1, in which the leader is less than 50% of the width of the production web and said leader is attached to a strip cut from the production web.
Claim 6
Dependent Claim
29 words
A method as in claim 1 including severing the moving production web from waste at a location downstream from the joining location, after the joining step has been completed.
References Cited (Backward Citations)
GB1338440A
Cited
US3925131A
Cited
US3749622A
Cited
US3896820A
Cited
US3733230A
Cited
US3854357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |