Melt blowing intermixed filaments of two different polymers
US3981650A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1975 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Jan 16, 1995 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D4/025
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A plastic extrusion mechanism having a die head primarily for use in a melt-blown process with the head formed in two mating parts respectively having first and second chambers therein with separate plastic heaters and pressure delivery extruder screws connected thereto and an insulated wall between the chambers with the lower end of the wall having slots leading to passages and alternate passages communicating with the first or second chambers and the passages leading to small extrusion openings for extruding microfibers of plastic and high velocity air directed against the microfibers for attenuation, and a traveling porous surface beneath the die head for receiving the fibers which are formed of plastic from the first chamber having a first physical characteristic and the second chamber having a different physical characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.