FORFARANDE FOR FRAMSTELLNING AV SLIPMASSA VID OVERTRYCK

FORFARANDE FOR FRAMSTELLNING AV SLIPMASSA VID OVERTRYCK

A process is provided for preparing groundwood pulp from debarked pulpwood logs which comprises grinding the logs under a superatmospheric pressure of a gas selected from the group consisting of steam, air and steam and air, while continuously supplying thereto process white water and water separate...

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Hauptverfasser: P O HAIKKALA, J A I LINDAHL
Format: Patent
Sprache:swe
Schlagworte:
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
PAPER-MAKING
PRODUCTION OF CELLULOSE
TEXTILES
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKINGMACHINE
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creator P O HAIKKALA
J A I LINDAHL
description A process is provided for preparing groundwood pulp from debarked pulpwood logs which comprises grinding the logs under a superatmospheric pressure of a gas selected from the group consisting of steam, air and steam and air, while continuously supplying thereto process white water and water separated in thickening groundwood pulp suspension at a temperature within the range from about 75 DEG to about 100 DEG C., and forming a pulp suspension in the resulting aqueous liquor; centrifugally separating steam from the pulp suspension, and using the separated steam to heat the water supplied to the grinding; thickening the pulp suspension to a pulp concentration within the range from about 5 to about 40%, and supplying water separated therefrom to the grinding; diluting the thickened pulp, and screening the diluted pulp suspension; after thickening the screened rejects suspension to a pulp concentration of at least 10% and defibrating the screened rejects suspension in a refiner, recycling the defibrated screened rejects to the from-steam-separated pulp suspension; and mixing the thickened and refined rejects suspension, having a pulp concentration of at least 8%, with the pulp suspension, thereby increasing the pulp concentration of the from-steam-separated pulp suspension, and thus facilitating its thickening.
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centrifugally separating steam from the pulp suspension, and using the separated steam to heat the water supplied to the grinding; thickening the pulp suspension to a pulp concentration within the range from about 5 to about 40%, and supplying water separated therefrom to the grinding; diluting the thickened pulp, and screening the diluted pulp suspension; after thickening the screened rejects suspension to a pulp concentration of at least 10% and defibrating the screened rejects suspension in a refiner, recycling the defibrated screened rejects to the from-steam-separated pulp suspension; and mixing the thickened and refined rejects suspension, having a pulp concentration of at least 8%, with the pulp suspension, thereby increasing the pulp concentration of the from-steam-separated pulp suspension, and thus facilitating its thickening.</description><subject>FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT</subject><subject>PAPER-MAKING</subject><subject>PRODUCTION OF CELLULOSE</subject><subject>TEXTILES</subject><subject>TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKINGMACHINE</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1981</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZDB38w9ycwxy9HNxVQAyFdyCHH2DQ1x9fPw8_dwVHMMUgn08A3wdg4MdFcI8XRT8w1yDQoIinb15GFjTEnOKU3mhNDeDnJtriLOHbmpBfnxqcUFicmpeakl8sKuJkYGJkbmTMUEFAGoZJzM</recordid><startdate>19811005</startdate><enddate>19811005</enddate><creator>P O HAIKKALA</creator><creator>J A I LINDAHL</creator><scope>EVB</scope></search><sort><creationdate>19811005</creationdate><title>FORFARANDE FOR FRAMSTELLNING AV SLIPMASSA VID OVERTRYCK</title><author>P O HAIKKALA ; 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subjects FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
PAPER-MAKING
PRODUCTION OF CELLULOSE
TEXTILES
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKINGMACHINE
title FORFARANDE FOR FRAMSTELLNING AV SLIPMASSA VID OVERTRYCK
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