GB626794A - Method of bleaching ground wood - Google Patents

Method of bleaching ground wood

Info

Publication number
GB626794A
GB626794A GB14533/47A GB1453347A GB626794A GB 626794 A GB626794 A GB 626794A GB 14533/47 A GB14533/47 A GB 14533/47A GB 1453347 A GB1453347 A GB 1453347A GB 626794 A GB626794 A GB 626794A
Authority
GB
United Kingdom
Prior art keywords
per cent
ground wood
hydrogen peroxide
trisodium phosphate
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.)
Expired
Application number
GB14533/47A
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.)
BUFFALO ELECTRO CHEM CO
Original Assignee
BUFFALO ELECTRO CHEM CO
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 BUFFALO ELECTRO CHEM CO filed Critical BUFFALO ELECTRO CHEM CO
Publication of GB626794A publication Critical patent/GB626794A/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Ground wood fibres are felted into a web from an aqueous suspension of the fibres and are bleached by applying to at least one face of the web an aqueous alkaline bleaching solution consisting of a peroxide and a soluble phosphate. The bleaching solution preferably has an initial pH of between 9.5 and 11.5. In examples: (1) a furnish containing 60 per cent unbleached ground wood and 40 per cent unbleached sulphite pulp together with clay, size and alum is formed into a sheet on the wire of a paper machine, pressed to a consistency of 35 per cent, impregnated with a solution containing hydrogen peroxide and trisodium phosphate so as to apply 2.0 per cent of hydrogen peroxide (27.5 per cent) and 2.0 per cent of trisodium phosphate (based on the dry weight of the pulp), and then dried; (2) a pulp sheet containing 70 per cent unbleached sulphite and 30 per cent ground wood is similarly bleached by impregnating with a solution of such concentration as to apply 1 per cent hydrogen peroxide and 1 per cent trisodium phosphate.
GB14533/47A 1946-09-20 1947-06-02 Method of bleaching ground wood Expired GB626794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US698402A US2510595A (en) 1946-09-20 1946-09-20 Method of bleaching groundwood

Publications (1)

Publication Number Publication Date
GB626794A true GB626794A (en) 1949-07-21

Family

ID=24805088

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14533/47A Expired GB626794A (en) 1946-09-20 1947-06-02 Method of bleaching ground wood

Country Status (4)

Country Link
US (1) US2510595A (en)
CH (1) CH265855A (en)
FR (1) FR951863A (en)
GB (1) GB626794A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2613579A (en) * 1947-08-27 1952-10-14 Buffalo Electro Chem Co Sizing and bleaching a wet web
US2692181A (en) * 1950-03-08 1954-10-19 Buffalo Electro Chem Co Treatment of unbleached sulfite pulp
US2661261A (en) * 1950-06-30 1953-12-01 Buffalo Electro Chem Co Method of superbleaching chemical pulp
US2687942A (en) * 1951-03-19 1954-08-31 Du Pont Bleaching of groundwood-sulfite pulp mixtures
US2723179A (en) * 1951-03-31 1955-11-08 Cons Water Power & Paper Co Bleaching a mixture of sulfite and semi-chemical pulps
US2872280A (en) * 1953-05-27 1959-02-03 Fmc Corp Process of bleaching cellulose pulps by absorbing alkali in the pulp and then applying hydrogen peroxide
NL202075A (en) * 1954-11-19 Fmc Corp
US2960382A (en) * 1955-05-13 1960-11-15 Armstrong Cork Co Method of bleaching linoleum using hydrogen peroxide bleach
US2860945A (en) * 1955-07-28 1958-11-18 Du Pont Bleaching cyanoethylated cotton fibers with hydrogen peroxidephosphate solution and optionally with water-soluble sulfoxylate solution
US3423283A (en) * 1965-09-02 1969-01-21 Dow Chemical Co Process of bleaching a sheet of groundwood pulp
US3507744A (en) * 1966-04-01 1970-04-21 Kimberly Clark Co Wood pulp bleaching process utilizing peroxide pyrophosphate high concentration compositions
US4014737A (en) * 1975-05-19 1977-03-29 Brennan Robert M Method of molding preform having 600% by weight water
CA2209014A1 (en) * 1994-12-28 1996-07-04 Minerals Technologies Inc. Bleaching of filled paper

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1409799A (en) * 1921-06-17 1922-03-14 George M Trostel Method of bleaching pulp
US2107297A (en) * 1934-03-08 1938-02-08 Buffalo Electro Chem Co Bleaching fiber
US2125634A (en) * 1937-03-29 1938-08-02 Oxford Paper Co Method of bleaching pulp or paper webs
US2150926A (en) * 1937-07-03 1939-03-21 Buffalo Electro Chem Co Process of making and bleaching paper
US2191431A (en) * 1938-04-13 1940-02-20 Buffalo Electro Chem Co Wood bleaching
US2435566A (en) * 1944-10-16 1948-02-10 West Virginia Pulp & Paper Co Peroxide bleaching of ground wood

Also Published As

Publication number Publication date
FR951863A (en) 1949-11-04
CH265855A (en) 1949-12-31
US2510595A (en) 1950-06-06

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