Process for preparation of cellulose acetate filters for use in paper making
US5662773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1995 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Jan 19, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention discloses a process for treating filter rods comprising cellulose acetate tow waste comprising the steps of: PA1 a. cutting said filter rods so that fiber of said cellulose acetate have a fiber length of less than about 4 inches; and PA1 b. treating said cut filter rods with an aqueous base until at least 5% of acetyl groups on said cellulose acetate has been hydrolyzed. Filter rods treated in this manner are suitable for use in various paper products. The process of the present invention may further include a step for repulping the cut filter rods to repulp any included plugwrap. Modified fiber comprising cellulose acetate wherein at least 5% of acetyl groups on said cellulose acetate have been hydrolyzed, said fiber having a length of less than about 4 inches, are also disclosed. Paper products comprising between about 5 and about 90% of the fiber of claim 21 and paper pulp are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.