Patent · US Expired

Method of reducing the energy consumption at the refining of cellulose containing material

US5007985A · kind A · utility

9Cited by

6References

1Claims

0Family size

Assignee

STFI · SE

Inventors

Per Engstrand · Täby, SE
Lars Hammar · Hagfors, SE
Myat Htun · Sundbyberg, SE
Rune L. Pettersson · Stockholm, SE

Key dates

Filing date	May 2, 1989
Grant date	Apr 16, 1991
Priority date	—
Expiry date	May 2, 2009

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21D1/20
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Method of reducing the energy consumption at the refining/beating of cellulose-containing material by the addition of alkali to the material for neutralizing acid groups bonded to the fibre wall. According to the invention, the pH-value in the pulp suspension is measured at the refiner outlet, the alkali is added in an amount depending on the measured pH value for neutralization without excess in the beating zone or immediately before the material enters the same, in an amount of 0.05-9 kg/ton, preferably 0.5-5 kg/ton, suitably 1-4 kg/ton, calculated as NaOH.

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