GB785060A - Process for obtaining bleached semi-chemical pulp - Google Patents

Process for obtaining bleached semi-chemical pulp

Info

Publication number
GB785060A
GB785060A GB949655A GB949655A GB785060A GB 785060 A GB785060 A GB 785060A GB 949655 A GB949655 A GB 949655A GB 949655 A GB949655 A GB 949655A GB 785060 A GB785060 A GB 785060A
Authority
GB
United Kingdom
Prior art keywords
bleaching
per
pulp
per cent
mill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB949655A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zellsloff Fabrik Waldhof AG
Original Assignee
Zellsloff Fabrik Waldhof AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zellsloff Fabrik Waldhof AG filed Critical Zellsloff Fabrik Waldhof AG
Publication of GB785060A publication Critical patent/GB785060A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

In the production of a bleached semi-chemical pulp from cellulose-containing raw material, the material is first subjected to a partial chemical disintegration, then bleached, and finally mechanically defibrated. The partial chemical disintegration may be effected by any known process, but is preferably carried out with an acid sulphite solution. The bleaching also may be carried out with known agents especially chlorine-containing bleaching agents, such as sodium hypochlorite, per-compounds such as peroxides, per-acids and their salts, in either acid or neutral or, most desirably, alkaline media. After bleaching, the mixture is mechanically divided in a pulping apparatus, for example, a disc mill, conical pulping mill or edge mill. In a preferred embodiment the mixture is subjected to a preliminary mechanical defibration after the partial chemical disintegration, but before the bleaching process. Up to 10 per cent, preferably 2-4 per cent, of dissolved silicate may advantageously be added to the bleaching solution, which should comprise up to 2.5, preferably 0.125-2.5, gram equivalents of bleaching agent per kg. of dry fibre pulp, and also 0.5-10 per cent of alkali hydroxide, based on the pulp.
GB949655A 1954-04-08 1955-04-01 Process for obtaining bleached semi-chemical pulp Expired GB785060A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEZ4142A DE1034473B (en) 1954-04-08 1954-04-08 Process for the production of bleached semi-pulp

Publications (1)

Publication Number Publication Date
GB785060A true GB785060A (en) 1957-10-23

Family

ID=7619037

Family Applications (1)

Application Number Title Priority Date Filing Date
GB949655A Expired GB785060A (en) 1954-04-08 1955-04-01 Process for obtaining bleached semi-chemical pulp

Country Status (5)

Country Link
BE (1) BE536814A (en)
CH (1) CH332820A (en)
DE (1) DE1034473B (en)
FR (1) FR1129498A (en)
GB (1) GB785060A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138484A2 (en) * 1983-10-20 1985-04-24 Kamyr Ab Mechanical pulping
GB2158474A (en) * 1982-08-05 1985-11-13 Honshu Paper Co Ltd For packaging metallic material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE404506C (en) * 1921-12-01 1924-10-18 A Olier Sa Des Ets Process and device for the production of pulp from wood-containing raw material
BE496841A (en) * 1949-07-12
FR1033615A (en) * 1951-01-25 1953-07-13 Azienda Brevetti Ind Improvement in the manufacture of semi-chemical pulp
AT175782B (en) * 1951-02-28 1953-08-10 Waldhof Zellstoff Fab Process for the production of semi-pulp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158474A (en) * 1982-08-05 1985-11-13 Honshu Paper Co Ltd For packaging metallic material
EP0138484A2 (en) * 1983-10-20 1985-04-24 Kamyr Ab Mechanical pulping
EP0138484A3 (en) * 1983-10-20 1986-07-02 Kamyr Ab Mechanical pulping

Also Published As

Publication number Publication date
FR1129498A (en) 1957-01-22
BE536814A (en)
DE1034473B (en) 1958-07-17
CH332820A (en) 1958-09-30

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