Method for the production of cellulose fibers using a two-step pre-treatment

US3998688A · kind A · utility

Assignee

• VEB Filmfabrik Wolfen-Fotochemisches Kombinat · DE

Inventors

• Klaus Fischer · Speyer, DE
• Josef Ringel · Dessau, DE

Key dates

• Filing date: Sep 4, 1974
• Grant date: Dec 21, 1976
• Expiry date: Sep 4, 1994

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21C1/00
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for the preparation of cellulose fibers from cellulose containing chips wherein the cellulose containing chips are subjected to a chemical process for the purpose of separating the cellulose from lignin and other extraneous chemicals which prior to digestion of the chips subjecting the chips to a two-step pre-treatment by: PA1 1. contacting said chips with an aqueous solution of an alkali metal, alkaline earth metal or ammonium sulfite or bi-sulfite metal; and, PA1 2. thereafter radiating the so pre-treated chips by contacting them with charged particles.