Method for manufacturing plastic cushioning material
Abstract
Abstract A method and apparatus for manufacturing plastics cushioning material which consists in feeding a first film made of thermoplastic material to the surface of a molding drum having a plurality of molding recesses formed therein, and air exhausting means communicating with said recesses and a cooling means disposed near the bottom of said recesses, heating said first film to a temperature over its softening point, pressing it for embossment which compressed air, feeding a second film similarly made of thermoplastic material to the surface of said molding drum to be attached to said first film in such a manner that said second film closes the openings of embossments formed on said first film, heating said second film to a temperature over its softening point, and integrally bonding both films by maintaining the temperature of both films at a higher level than their softening points, thereby hermetically sealing up the embossments of said first film.
Inventors
- 👤 Wasuke Sato
- 👤 Shigeyuki Hatakeyama
- 👤 Masashi Koide
- 👤 Sadao Yamamoto
- 👤 Mitsumaro Fujisawa
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |