Apparatus for continuously producing corrugated plastic board
Abstract
Abstract A continuous plastic material shaping apparatus of the type in which a revolving drum having an undulating mold and suction orifices at its periphery against which a plastic material sheet to be shaped is brought to be fed and sucked by vacuum suction through the orifices connected with the interior of the drum which is kept under vacuum, the improvements being that on side edges of the periphery are provided flanges so arranged that the peripheral surface thereof may be on the same level as the convex crest of the undulations of the mold, with each flange having slot or groove therearound with orifices therein, through which orifices vacuum suction is effected. By means of the improved apparatus plastic materials to be shaped are sealingly retained on the peripheral surface of the mold and on the flanges so that a vacuum molding process may be carried out without vacuum leakage.
Inventors
- 👤 H Asakura
- 👤 K Sakai
- 👤 H Mizuguchi
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |