Process for the production from thermoplastic polymers of superfine fibre nonwoven fabrics
US5114631A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1991 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Mar 28, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD04H1/56
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The process for the production of superfine polymer fibre novwoven fabrics is based on spinning out radically the molten polymer at supply pressure in a rotating nozzle head (6) through a plurality of discharge opening (27) to form fibres and deflecting in the axial direction the not yet completely solidified fibres at a radial distance of 10 mm to 200 mm from the discharge holes (27) by an outer gas stream (8) and afterwards depositing them as nonwoven fabric (15) on a circulating, air-permeable carrier (12). In addition to the outer gas stream (8) an inner gas stream (24) emerges at a lower velocity from a plurality of axial boreholes (23) in the nozzle head (6) at a smaller radial distance than the discharge holes (27). Owing to the centrifugal sweeping forces at the rotating nozzle head (6) a rotationally symmetrical flow field then developes with a predominantly radial velocity component, the temperature of the gas being equal to or greater than the nozzle head temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.