Sealing of foam plastic sheets
Abstract
Abstract FIG-01 THE INVENTION RELATES TO A METHOD FOR OVERLAPPING SEALING FOAM PLASTIC FILMS OR FOAM PLASTIC SHEETS WITH A DENSITY BELOW 250 KG. PER M.3, WHICH ARE LAID ON TOP OF EACH OTHER WITHOUT A BONDING AGENT AND ARE COMPRESSED IN DIES AT A TEMPERATURE ABOVE TH SOFTENING POINT OF THE PLASTIC. THEREAFTER THE PRESSURE IS REDUCED, SO THAT THE COMPRESSED PRODUCT FOAMS RAPIDLY AGAIN TO FORM A NEW INTEGRAL SHEET OF A PREDETERMINED FOAM PLASTIC THICKNESS, AT WHICH TIME IT IS COOLED TO REFORM THE PRODUCT FOR EXAMPLE, A SINGLE BLANK FOLDED INTO A CONTAINER HAVING A BOTTOM CONSISTING OF FLAPS FOLDED INTO EACH OTHER, AND A SIDE SEAM CAN ALL BE SEALED AND REFORMED INTO AN INTEGRATED WHOLE. WITH A FINAL THICKNESS SUBSTANTIALLY EQUAL TO THE THICKNESS OF ONE SINGLE SHEET.
Inventors
- 👤 A Ratten
- 👤 Brederode J Van
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |