Apparatus for spinning hollow bicomponent filaments
US6551088B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Aug 14, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/217
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for spinning hollow bicomponent filaments. The apparatus includes a distributor, a spinneret having holes and a shim having openings fixed between the distributor plate and the spinneret. The distributor supplies a first polymer having an MV to a first part of the spinneret holes and a second polymer having a lower MV to a recessed section of the spinneret. The shim openings are positioned above the spinneret holes and extend away from the first part of the holes to allow the second polymer to flow from the recessed section, through the shim openings, to a second part of the spinneret holes. The two polymers travel along the opposed first and second parts of the holes until exiting the spinneret through respective asymmetric C-shaped apertures. The apertures are sized so that hydraulic split does not occur between the polymers and consequently potential filament kneeing is obviated. Upon exiting the apertures, the polymers self-join to form hollow filaments and are quenched. Since the polymers have different MV properties, the filaments self-crimp into a spiral configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.