Procedure for producing high yield pulp

Details Procedure for producing high yield pulp Procedure for producing high yield pulp

D - Textiles, Paper

21

C

92/56

D21C 7/00 (2006.01) D21B 1/16 (2006.01) D21C 3/02 (2006.01)

Patent

CA 1137802

ABSTRACT A method of producing pulp in high yield is disclosed in order to achieve strength improvement and increased absorption of liquid in the paper end-product. A lignocellulosic material is treated in liquid or gas phase in an alkaline medium, the treatment being performed in the presence of oxygen gas. It is possible to perform the treatment on the material when in the form of logs, chips or shavings as well as on completely or partly separated fibres. The treatment is performed with such a combination of treatment time, temperature, charge of chemicals, oxygen gas pressure and pulp consistency that pulp yield, i.e. the ratio between the produced amount of fibre and the charged amount material, is higher than 80%, preferably within the range of 80 - 95%.

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