Patent CA1103413A successfully refreshed from Google Patents.
CA1103413A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Process for the manufacture of mechanical pulp
Assignee: PAPERINDUSTRIENS FORSKNINGSINSTITUTT
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Filing: 1977-02-24
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Granted: 1981-06-23
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Expires: 1997-02-24
Abstract
Abstract ABSTRACT OF THE DISCLOSURE The present invention provides a process for the manufacture of mechanical pulp suitable for absorption purposes in which the wood raw material before, during and/or after mechanical defibration is treated with alkaline reacting components and in which the defibrized pulp is dried, optionally after sheet formation, characterized in that the pulp is dried in an alkaline buffered condition,
Inventors
- 👤 Nicolai Soteland
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-05 12:20
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/14; D21B1/16; D21B1/38; D21F; D21F11/00; D21F11/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A process for the manufacture of mechanical pulp suitable for absorption purposes in which the wood raw material before, during and/or after mechanical defibration is treated with alkaline reacting components at a temperature in the range 50-150°C and in which the defribrized pulp is dried, characterized in that the pulp is dried in an alkaline buffered condition at pH 7-10.
Claim 2
Dependent Claim
60 words
A process for the manufacture of mechanical pulp suitable for absorption purposes in which the wood raw material before, during and/or after mechanical defibration is treated with alkaline reacting components at a temperature in the range 50-150°C and in which the defribrized pulp is dried, characterized in that the pulp is dried in an alkaline buffered condition at pH 7-10.
Claim 3
Dependent Claim
23 words
A process in accordance with claim 1, characterized in that the pH of the alkaline pulp is adjusted to pH 7-9 before drying.
Claim 4
Dependent Claim
33 words
A process in accordance with claim 2, characterized in that the pH of the pulp is adjusted by the addition of phosphoric acid, carbonic acid, citric acid or tartaric acid, or mixtures thereof.
Claim 5
Dependent Claim
30 words
A process in accordance with claim 1, characterized in that the pulp is bleached under alkaline conditions at a temperature in the range of 50-150°C, whereafter the pulp is dried.
Claim 6
Dependent Claim
19 words
A process in accordance with claim 4, in which the pulp is dried after a pH adjustment to 7-9.
Claim 7
Dependent Claim
19 words
A process in accordance with claim 1, 2 or 3, in which the pulp is dried after sheet formation.
References Cited (Backward Citations)
No citation records indexed.
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