Acid bonding nonwoven fabrics
Abstract
Abstract A PROCESS FOR MAKING A BONDED NONWOVEN FABRIC FROM A BLEND OF NYLON FIBERS AN FIBERS OF ANOTHER KIND OF MATERIAL. THE FIBERS ARE FORMED INTO A WEB WHICH IS TREATED WITH A CONCENTRATED SOLUTION OF A STRONG ACID WHICH AFFECTS THE NYLON BUT DOES NOT SUBSTANTIALLY AFFECT THE OTHER MATERIAL. THE NYLON IS SOFTENED AND SWOLLEN BY THE CONCENTRATED ACID. THEN, THE WEB IS CONTACTEDWITH WATER WHICH DILUTES THE CONCENTRATED ACID AND COAGULATES THE NYLON. SUBSEQUENTLY, THE WEB IS SUBJECTED TO PRESSURE. THE ACID TREATMENT MAKES THE NYLON MORE SUSCEPTIBLE TO PRESSURE BUT DOES NOT HAVE THIS EFFECT ON THE FIBERS OF THE OTHER MATERIAL. WHEN PRESSURE IS APPLIED, THE NYLON FLOWS AND CAUSES THE OTHER FIBERS TO BE BONDED TO EACH OTHER.
Inventors
- 👤 Thomas S Morris
Bibliographic Details
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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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |