Apparatus and method for producing non-woven webs with high filament velocity
US6183684A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Mar 26, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD04H3/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for producing a non-woven polymeric fabric web, such as a spunbond web, having filaments of 0.1 to 5 or higher denier with equivalent production rates is provided. A plurality of continuous polymeric filaments are extruded from an extruder and attenuated by a drawing unit that includes a longitudinal elongated slot strategically positioned at an optimum distance very close to the spinneret to increase the filament velocity by reducing air viscous drag on filaments and a drawing unit slot having a lower slot length of approximately 210 mm or less to increase form drag. A web forming table is positioned below the drawing unit for collecting the filaments and forming the filaments into a non-woven fabric web. Filaments of increased tensile strength are created by stress-induced crystallization resulting from higher filament velocity due to increased force on the filaments with less air viscous drag between the filaments and air streams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.