Apparatus for forming thermoplastic windows on envelopes,bags or boxes
Abstract
Abstract CONTINUOUS METHOD OF FORMING THERMOPLASTIC WINDOWS IN A MOVING WEB OF ENVELOPE, BAG, BOX, ETC. MATERIAL. CUTTING WINDOW OPENINGS IN THE WEB, PREHEATING, PASSING THE PREHEATED WEB THROUGH A NIP IN CONTACT WITH AN EXTRUDED STRIP OF THERMOPLASTIC FILM, BONDING IN THE NIP BY HEAT AND PRESSURE. END PRODUCT IS A WEB WITH THERMOPLASTIC WINDOWS FORMED AT SPACED INTERVALS, THIS WEB SUITABLE FOR LEADING TO FEED ROLLS OF CONVENTIONAL CONVERTING MACHINE, SO THAT IT DIRECTLY PRODUCES WINDOWED ARTICLES. APPARATUS HAS A COOLING ROLL HAVING DEPRESSED AREAS WITH A COOLING AREA THEREBETWEEN, COOLING BEING BY COMPRESSED AIR. HEATED KNIFE BLADES OF THE ROLL, OR AIR JETS, CUT THE FILM SUITABLY WITH UNUTILIZED SECTIONS URGED THROUGH A CAVITY IN FLOOR OF DEPRESSED AREA TO A HOLLOW SHAFT FOR REPROCESSING. ELECTROSTATIC PINNING OF THE FILM TO THE ROLL.
Inventors
- 👤 Peter Weisshuhn
Bibliographic Details
Claims Analysis
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |