Low turbulence die assembly for meltblowing apparatus
US7316552B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2004 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Sep 28, 2025 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D4/025
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for forming meltblown material from a molten polymer includes a die configured with channels in the tip of the die through which molten polymer is extruded for forming meltblown fibers. Air plates are disposed relative to the die tip to define air channels proximate to the die tip for directing attenuating air against the molten polymer fibers extruded from the tip. The air channels include a zone of convergence adjacent the apex of the die tip at an included angle that is within a range of about 10 degrees to about 20 degrees such that each of the air channels defines a convergence angle with respect to a longitudinal axis of the polymer channels of between about 5 degrees to about 10 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.