Scrapless forming of plastic articles
Abstract
Abstract A SCRAP FREE PROCESS FOR RAPIDLY MAKING THERMOPLASTIC CONTAINERS WHEREIN THE RESULTANT CONTAINERS CAN, IF DESIRED, BE MULTILAYERED FOR VAPOR OR GAS BARRIER OR OTHER REASONS, OR BE ORIENTED FOR TOUGHNESS AND IMPROVED STRESS CRACK RESISTANCE. THE CONTAINTERS CAN BE FORMED FROM MULTILAYERED OR HOMOGENEOUS PLASTIC SHEETS WHEREIN A RELATIVELY THIN THERMOPLASTIC BLANK IS PROVIDED. THIS BLANK IS LUBRICATED, HEATED AND FORGED INTO A DESIRED SHAPE PREFORM WITH A PREDETERMINED LIP CONFIGURATION. THE CENTER PORTION OF EACH SAID PERFORM IS MAINTAINED AT A FORMING TEMPERATURE WHILE THE PERIPHERAL PORTION THEREOF IS RAPIDLY BROUGHT BELOW THE SOFTENING POINT OF THE PLASTIC RESIN. THE PREFORM IS THEN IMMEDIATELY THERMOFORMED INTO A CONTAINER HAVING A DESIRED SHAPE AND SIZE, AND COOLED. IF DESIRED, THE PREFORM CAN BE FORGED, COOLED AND ECOVERED FOR A SUBSEQUENT THRMOFORMING OPERATION.
Inventors
- 👤 R Ayres
- 👤 K Cleereman
- 👤 W Schrenk
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |