D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/13
D21C 3/00 (2006.01) D21B 1/02 (2006.01)
Patent
CA 1075857
ABSTRACT OF THE DISCLOSURE The specification discloses a process for making an improved refiner mechanical pulp from pieces of wood, such as wood chips. The process may preferably comprise: a) Comminuting the wood chips largely by splitting along the wood grain to make smaller particles; b) Wetting said particles with a solution of a sulphite salt of an alkali metal to add an amount of said salt within the range of 1% to 10% of the oven dry weight of said particles, said solution having a pH within the range of 7 to 12.5; c) Steam heating the sulphite solution bearing particles to a temperature within the range between 80°C and 165°C and holding them within that temperature range for a period of 0.5 to 80 minutes; d) Passing the particles after the said period of holding through a disc refiner to produce refiner mechanical pulp. The sulphite is preferably sodium sulphite.
246173
Beath Laurence R.
Mihelich Walter G.
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