FR2367860A1 - Bleached wood pulp from shavings in a single stage - in a thermo-mechanic pulper with addn. of bleach during pulping (SW 16.5.78) - Google Patents

Bleached wood pulp from shavings in a single stage - in a thermo-mechanic pulper with addn. of bleach during pulping (SW 16.5.78)

Info

Publication number
FR2367860A1
FR2367860A1 FR7730951A FR7730951A FR2367860A1 FR 2367860 A1 FR2367860 A1 FR 2367860A1 FR 7730951 A FR7730951 A FR 7730951A FR 7730951 A FR7730951 A FR 7730951A FR 2367860 A1 FR2367860 A1 FR 2367860A1
Authority
FR
France
Prior art keywords
shavings
single stage
pulper
wood
wood pulp
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.)
Withdrawn
Application number
FR7730951A
Other languages
French (fr)
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.)
Akzo Nobel UK PLC
Original Assignee
Courtaulds PLC
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
Priority claimed from GB4287876A external-priority patent/GB1569264A/en
Priority claimed from GB250177A external-priority patent/GB1588140A/en
Application filed by Courtaulds PLC filed Critical Courtaulds PLC
Publication of FR2367860A1 publication Critical patent/FR2367860A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Landscapes

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

Abstract

Bleaching wood pulp is mfd. from wood shavings in a single stage in a thermomechanic pulper by adding a bleaching agent (I) to the wood to bleach it as it is being pulped. Specifically the shavings, preheated to 100-110 degrees C., are pulped in a double disc refiner. A soln. or aq. suspension of (I) is charged to the refiner such that it comes into contact with the shavings at the centre of the refiner. (I) is added at 0.5-5 wt.% based on the wt. of the dried wood solids charged. (I) is esp. H2O2 added as an aq. soln. (0.5-10% by wt.) pH 9-12. (I) can also be an alkali metal dithionite, or (hypo)chlorite. The prod. has improved absorbency and is used in the paper industry for absorbent hygienic products, e.g. disposable paper towels. The single stage process gives products at least as good and in a much faster time than conventional methods.
FR7730951A 1976-10-15 1977-10-14 Bleached wood pulp from shavings in a single stage - in a thermo-mechanic pulper with addn. of bleach during pulping (SW 16.5.78) Withdrawn FR2367860A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4287876A GB1569264A (en) 1976-10-15 1976-10-15 Circuit for the visual monitoring of voltage
GB250177A GB1588140A (en) 1977-01-21 1977-01-21 Method of preparing bleached pulp

Publications (1)

Publication Number Publication Date
FR2367860A1 true FR2367860A1 (en) 1978-05-12

Family

ID=26237559

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7730951A Withdrawn FR2367860A1 (en) 1976-10-15 1977-10-14 Bleached wood pulp from shavings in a single stage - in a thermo-mechanic pulper with addn. of bleach during pulping (SW 16.5.78)

Country Status (2)

Country Link
FR (1) FR2367860A1 (en)
SE (1) SE7711552L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371544A1 (en) * 1976-11-23 1978-06-16 Defibrator Ab METHOD AND APPARATUS FOR THE CONTINUOUS PRODUCTION OF PULP FROM FIBROUS WOOD CELLULOSE MATERIALS
EP0333398A2 (en) * 1988-03-16 1989-09-20 Morton International, Inc. Process for bleaching mechanical wood pulp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371544A1 (en) * 1976-11-23 1978-06-16 Defibrator Ab METHOD AND APPARATUS FOR THE CONTINUOUS PRODUCTION OF PULP FROM FIBROUS WOOD CELLULOSE MATERIALS
EP0333398A2 (en) * 1988-03-16 1989-09-20 Morton International, Inc. Process for bleaching mechanical wood pulp
US5129987A (en) * 1988-03-16 1992-07-14 Morton Thiokol, Inc. Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner

Also Published As

Publication number Publication date
SE7711552L (en) 1978-04-16

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Legal Events

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