Apparatus for butt welding thermoplastics sheets and films
Abstract
Abstract Improvements in the process and apparatus of application Ser. No. 236,766 Mar. 21, 1972. There is described a technique for butt welding a trailing end of one roll of thermoplastic film or sheet material to the leading edge of another roll of such material by vertically superimposing the trailing and leading portions of the two rolls, aligning the lateral edges of such portions over a significant distance sufficient to insure angular alignment of the two rolls at the butt weld. Severing the two portions along a coincident transverse line, heating the severed portions to an extent sufficient to weld such together, and bringing the heated transverse edges of the two portions together while maintaining lateral edge alignment of said portions, whereby butt welding such into a continuous sheet.
Inventors
- 👤 D Johnson
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |