Spinneret for making complex hollow filaments
Abstract
Abstract MELT SPINNING SPINNERETS ARE MADE BY FORMING IN A SPINNERET A HOLE OF TWO DIFFERENT DIAMETERS. A HOLLOW INSERT IS PRESS-FITTED IN THE HOLE SO THAT THE INSERT EXTENDS SLIGHTLY BELOW THE PLANE OF THE EXTRUSION FACE OF THE SPINNERET. THE INSERT HAS A COUNTERBORE COMMUNICATING WITH A SERIES OF SMALL ASSAGEWAYS EXTENDING TO THE POINT OF EXTRUSION WHERE THE PASSAGEWAYS FORM A PATTERN ADAPTED TO PRODUCE A TEXTILE FILAMENT BY THE COALESCENCE OF A CLUSTER OF SMALL STREAMS OF POLYMER AT A POINT BELOW THE SPINNERET FACE. THE RESULTING FILAMENTS HAVING A MULTITUDE OF LOBES AND AXIALLY EXTENDING VOIDS. DURING EMPLOYMENT OF THE SPINNERET, RINGS SURROUNDING THE INDIVIDUAL FILAMENTS CAN BE USED TO SUPPLY A COOLING FLUID TO SOLIDIFY THE FILAMENTS IN A CONTROLLED MANNER SHORTLY AFTER THE EMERGENCE OF THE STREAMS OF MOLTEN POLYMER FROM THE SPINNERET.
Inventors
- 👤 Euell K Mcintosh
- 👤 Paul T Howse Jr
Bibliographic Details
Claims Analysis
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |