Low air pressure method and apparatus for forming filter rods
US4541825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1982 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D3/0233
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention relates to high speed process and apparatus suitable for the preparation of cigarette filter rods having high tow utilization in terms of pressure drop per unit rod weight without producing substantial tow density variations. In accordance with this invention, it has been discovered that in a process for manufacturing filter elements from opened and deregistered crimped continuous filament tow, wherein said tow is conducted from a mechanical forwarding means through an aspirating jet positioned adjacent a compacting means and wherein means are provided for dissipating aspirating fluid, that filter rod pressure drop and weight variations are reduced by aspirating at low pressures and more specifically, at fluid pressures of not more than about 3 pounds per square inch gauge and by causing the aspirating fluid, at its point of contact with the continuous filament tow, to flow substantially in a direction axial to that of the tow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.