Spinneret for producing composite filaments
Abstract
Abstract A SPINNERET FOR SPINNING TWO COMPONENT FILAMENTS COMPRISING A UNITARY CORE AND A SHEAT CONJOINTLY MELT-SPUN AROUND THE CORE AND WHOLLY COVERING THE CORE, COMPRISES AN INNER NOZZLE FOR EXTRUDING THE CORE AND AN OUTER NOZZLE FOR SPINNING THE SHEATH. THE INNER NOZZLE IS ARRANGED UPSTREAM IN APPROXIMATE ALIGNMENT WITH THE OUTER NOZZLE. THE INNER NOZZLE HAS AN EXTRUSION OPENING WITH A BASICALLY SYMMETRICAL CROSS SECTIONAL AREA OF NON-CIRCULAR SHAPE HAVING A MEAN MOMENT OF INERTIA HIGHER THAN THAT OF A CIRCULAR SECTION OF THE SAME AREA. THE CORRESPONDING CROSS SECTIONAL SHAPE OF THE EXTRUDED CORE IMPARTS FLEXURAL RIGIDITY AND BENDING RESISTANCE TO THE CORE. THE CROSS SECTIONAL SHAPE OF THE OUTER NOZZLE MAY BE CIRCULAR OR MAY CONFORM TO THAT OF THE INNER NOZZLE.
Inventors
- 👤 Masao Matsui
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |