Method for manufacturing nonwoven sheet material
Abstract
Abstract D R A W I N G A METHOD AND APPARATUS FOR MAKING NONWOVEN SHEET MATERIAL IN WHICH ENDLESS FIBERS ARE SPREAD APART FORM EACH OTHER INTO A FIBER MAT, THEN IMMERSED IN A FORMING MEDIUM, CUT INTO FIBERS OF FINITE LENGTH AND FORMED INTO A SHEET ON A PERMEABLE SUPPORT EITHER ALONE OR WITH TRADITIONAL SHORT FIBERS SUCH AS CELLULOSE OR GROUND WOOD FIBERS. THE ENDLESS FIBERS ARE PROVIDED IN A BUNDLE WHICH IS BEATEN TO LOOSEN THE FIBERS BEFORE THE SPREADING STEP AND THE SPREADING IS ACCOMPLISHED EITHER BY EXPOSING THE FIBERS TO AN ELECTRIC FIELD OR BY ONE OR MORE AIR CURRENTS OR BOTH. THE FIBERS ARE CUT WHILE IMMERSED IN THE FORMING MEDIUM (FOR EXAMPLE, WATER) BY A PLURALITY OF REPLACEABLE KNIVES MOUNTED ON A ROLLER AND A COUNTERKNIFE. THE KNIVES ARE SPACED ABOUT THE CIRCUMFERENCE OF THE ROLLER AT VARIABLE DISTANCES SO THAT WHEN THE ROLLER IS ROTATED THE FIBERS ARE CUT INTO DIFFERENT LENGTHS.
Inventors
- 👤 Fritz Opderbeck
- 👤 Theodor Ploetz
- 👤 Rudolf Thamm
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |