Method for making packaging material
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF A COMPOSITE PACKAGING MATERIAL WITH TWO OUTER LAYERS OF SHEET-FORM MATERIALS BONDED TO AN INTERMEDIATE LAYER IN WHICH A LAYER OF PLASTICS GRANULATE IS CONTINUOUSLY POURED ONTO A WEB FROM A LOWER ONE OF THE TW OUTER LAYERS. A WEB FORMING THE UPPER OUTER LAYER IS APPLIED TO THE PLASTICS GRANULATE LAYER A BONDING AGENT IN THE FORM OF A THERMOPLASTIC POWDER IS APPLIED TO THE INSIDE OF THE OUTER LAYERS. THE WHOLE IS HEATED TO A FOAMING TEMPERATURE AND THEN LEFT TO COOL. THE PROCESS IS CARRIED OUT IN AN APPARATUS WHICH HAS DELIVERY ROLLERS FOR THE TWO OUTER LAYERS AND ADJUSTABLE FEED DISTRIBUTORS FOR THE GRANULATE AND THE BONDING AGENT AND A HEATING DEVICE. A PAIR OF ROLLERS IS ARRANGED IN FRONT OF THE HEATING DEVICE TO LIMIT, DAM AND CIRCULATE THE GRANULATE.
Inventors
- 👤 K Rath
- 👤 H Rueckert
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |