Patent · US Expired

Method for use in the defibration or refining of lignocellulose-containing fibrous materials

US4311553A · kind A · utility

19Cited by

0References

6Claims

0Family size

Assignees

Sunds Defibrator AB · SE
Eka AB · SE

Inventors

Sven G. Akerlund · Sollentuna, SE
Jan-Erik Hook · Honeytree Loop East, SE

Key dates

Filing date	Jan 14, 1980
Grant date	Jan 19, 1982
Priority date	—
Expiry date	Jan 14, 2000

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21B1/16
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method of producing peroxide bleached pulp. Lignocellulose fiber material is impregnated with an aqueous silicate solution containing a sequestering agent. The impregnated lignocellulose is preheated with saturated steam at a temperature corresponding to the defibrating temperature to precipitate silic acid on and in the fibers. The preheated fiber mass is defibrated between two grinding disc in an atmosphere of saturated steam at a temperature of 100.degree.-170.degree. C. Alkaline peroxide solution free of silicate is introduced into the grinding space.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.