Process for producing stone groundwood pulp from wood chips by using a stone grinder
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United States of America Patent
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Jan 27, 1981
Grant Date -
N/A
app pub date -
Oct 4, 1978
filing date -
Oct 17, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a process for producing stone groundwood pump from wood chips, by compressing a wood chip mass into an apparent volume corresponding to 70% or less, preferably, from 40 to 60%, of the original apparent volume of the wood chip mass and by grinding the compressed wood chip mass, under pressure, with a stone grinder. The wood chips may be treated, before the grinding step, with both or either one of steam and a treating agent, such as sodium monosulfite, sodium disulfite and sodium bicarbonate.
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