Method for the continuous production of a foamed polyurethane slab involving flow from a vessel over a weir structure
Abstract
Abstract METHOD FOR PRODUCING CONTINUOUS POLYMERIC FOAM SLABS, CHARACTERIZED IN THAT THE LIQUID FOAM REACTANTS ARE INITIALLY INTRODUCED INTO THE BOTTOM OF A VESSEL AND THE RESULTING FOAM IS ALLOWED TO EXPAND UPWARDLY IN THE VESSEL DUE TO CHEMICAL REACTION BETWEEN THE REACTANTS, PRIOR TO COMPLETION OF THE EXPANSION OF THE MIXTURE, THE EXPANDING FOAM IS ALLOWED TO FLOW FROM THE VESSEL OVER A WEIR STRUCTURE, WHEREUPON THE FOAM COMPLETES THE EXPANSION PROCESS IN A CHANNEL-SHAPED CONVEYOR IN WHICH THE FOAM IS CONTINUOUSLY MOVED AWAY FROM THE WEIR STRUCTURE. ACCORDING TO ONE EMBODIMENT, THE FOAM THAT FLOWS OVER THE WEIR MOVES DOWN AN INCLINED FALL PLATE SURFACE DURING COMPLETION OF FOAM EXPANSION. IN ANOTHER EMBODIMENT, THE EXPANDING FOAM PASSES OVER THE WEIR DIRECTLY ONTO THE HORIZONTAL REACH OF A CONVEYOR.
Inventors
- 👤 L Berg
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |