US1716006A - Method of producing cellulose and paper from straw, esparto, reed, and similar raw materials - Google Patents

Method of producing cellulose and paper from straw, esparto, reed, and similar raw materials Download PDF

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Publication number
US1716006A
US1716006A US179195A US17919527A US1716006A US 1716006 A US1716006 A US 1716006A US 179195 A US179195 A US 179195A US 17919527 A US17919527 A US 17919527A US 1716006 A US1716006 A US 1716006A
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US
United States
Prior art keywords
cellulose
straw
paper
pulp
reed
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 - Lifetime
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US179195A
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English (en)
Inventor
Rinman Erik Ludvig
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Individual
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Individual
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Publication of US1716006A publication Critical patent/US1716006A/en
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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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials

Definitions

  • Cellulose made from straw has hitherto been used exclusively as an ingredient added to other cellulose in the manufacture of line grades of note-paper and writing-paper. 1n the production of such cellulose the main object has been to obtain an easily washed and easily bleached cellulose, and for this purpose the straw has been boiled at an excess )ressure of t to 6 kg. per sq. cm. The cellulose fibre obtained in this manner, however, becomes short and weak. During recent times another method has also been pro posed which consists in first treating the straw at a low temperature of about 100 C.
  • the present invention relates to a method of producing from straw, csparto, reed, and similar raw materials, a cellulose having properties quite different from those of the above-mentioned hitherto known straw cellulose, and also to a method of producing from the cellulose thus obtained, a paper having properties particularly desirable for certain purposes.
  • the method of produc ing the cellulose consists principally in that the raw material is subjected to boiling with caustic soda lye, with or without sodium sulphide added thereto, at a temperature above 100 C. but 'not exceeding 140 0., in such manner that glutinous substances present in the raw material are not destroyed, and that the separation of the waste liquor from the cellulose after the boiling is completed, is carried out at a temperature of C.
  • the raw material may consist of ordinary straw, for instance straw or rye, wheat, barley or oats, or of reed, Indian corn straw, rice straw, esparto, sugar cane, sunflower stalks, cotton plants, papyrus, or similar vegetable matter.
  • the separation of the waste liquor from the cellulose fibres is carried out most suitably insuch manner that the entire pulp together with the waste liquor is cooled to about 30 C. before the separation, and that the washing itself is carried out by means of cold wash- 0 ing liquids and cold water.
  • the straw cellulose obtained in the manner above described may also be used to replace the strong sulphite cellulose in the production of ordinary newsprint paper.
  • the yellow colour of the straw cellulose is scarcely noticeable in the paper owing to the great addition of mechanical pulp (about percent) and may, besides, always be covered by adding suitable dyes.
  • the straw cellulose obtained according to the invention shows on the whole a great resemblance to ordinary sulphite cellulose.
  • 'lhe straw cellulose produced according to the invention may be bleached without the glutinous substance being destroyed, if a higher temperature than about 30 C. is not used during the bleaching.
  • Rye straw is used as raw material.
  • the straw is first chopped to chaff of a length of about 3 cm.
  • the chaff is afterwards sifted through a rotary sieve which must be so fine that it does not let through the ears but all chairs.
  • the chopped straw free from cars obtained in this manner is afterwards passed through a cyclone apparatus for the purpose of removing the dust.
  • the chopped straw is afterwards boiled in an upright digester with circulating digester liquor which is drained just below the middle of the digester and,
  • the digester For the boiling a mixture of white liquor and black liquor is suitably used, so that when the boiling is finished, the waste liquor has a specific gravity of 1.1% at 20 C. For the boiling 150 to 170 kg. NaOll are used per 1000 kg. chopped straw. The time of boiling amounts to about 3 hours when an excess pressure of 1.8 kg. is used. Yhen the boiling is finished the pulp is blown to a blowing dillusor from which it is tapped into a receptacle in which it is diluted with strong cold black liquor, so that a mixture is obtained which contains about 4 percent cellulose and has a temperature of 50 C. at the most.
  • the straw cellulose is separated from the waste liquor by means of a rotary filter on which the washing is etlected, at first with cold washing liquids and linally with cold water.
  • Formation of scum in the rotary filter apparatus receptacle for liquor and washing liquid is suitably prevented by an addition ofpetroleum, or oils having a high boiling temperature and obtained by dry distillation of waste liquor from the cellulose manufacture.
  • the straw cellulose difi'usors can not be used, since after cooling the black liquor the pulp can not be filtered in thick layers owing to the presence of the glutinous substances.
  • the pulp obtained is afterwards diluted with water, during further defibration if desired, after which the knots are strained ofi.
  • the pure pulp thus obtained is afterwards ground in heaters in the manner above described, after which it is ready to be transferred on to the wire apron of the paper machine. If the pulp is to be bleached, this may suitably be eifected simultaneously with the defibration, after which the pulp is strained and further treated.
  • the pulp heaters having very broad knives may suitably be used.
  • the pulp can then be ground to a grinding degree of 75 degrees S.-R. in two or three hours time without the fibres being torn 03.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
US179195A 1926-04-07 1927-03-28 Method of producing cellulose and paper from straw, esparto, reed, and similar raw materials Expired - Lifetime US1716006A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE269154X 1926-04-07

Publications (1)

Publication Number Publication Date
US1716006A true US1716006A (en) 1929-06-04

Family

ID=20306713

Family Applications (1)

Application Number Title Priority Date Filing Date
US179195A Expired - Lifetime US1716006A (en) 1926-04-07 1927-03-28 Method of producing cellulose and paper from straw, esparto, reed, and similar raw materials

Country Status (6)

Country Link
US (1) US1716006A (enrdf_load_stackoverflow)
BE (1) BE340575A (enrdf_load_stackoverflow)
DE (1) DE567095C (enrdf_load_stackoverflow)
FR (1) FR631088A (enrdf_load_stackoverflow)
GB (1) GB269154A (enrdf_load_stackoverflow)
NL (1) NL23100C (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2566130A (en) * 1944-06-10 1951-08-28 Riegel Paper Corp Manufacture of glassine paper
US2629295A (en) * 1945-06-15 1953-02-24 Eastman Kodak Co Method of making paper
US2706159A (en) * 1951-03-09 1955-04-12 American Enka Corp Manufacture of artificial sponges
US3044957A (en) * 1959-06-01 1962-07-17 Fram Corp Porous separator media
US4385172A (en) * 1980-03-24 1983-05-24 International Paper Company Prevention of hornification of dissolving pulp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022088B (de) * 1952-12-19 1958-01-02 Elbert Clyde Lathrop Verfahren zum Aufschliessen einjaehriger, pflanzlicher Faserstoffe, insbesondere Stroh od. dgl.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2566130A (en) * 1944-06-10 1951-08-28 Riegel Paper Corp Manufacture of glassine paper
US2629295A (en) * 1945-06-15 1953-02-24 Eastman Kodak Co Method of making paper
US2706159A (en) * 1951-03-09 1955-04-12 American Enka Corp Manufacture of artificial sponges
US3044957A (en) * 1959-06-01 1962-07-17 Fram Corp Porous separator media
US4385172A (en) * 1980-03-24 1983-05-24 International Paper Company Prevention of hornification of dissolving pulp

Also Published As

Publication number Publication date
NL23100C (enrdf_load_stackoverflow)
BE340575A (enrdf_load_stackoverflow) 1927-04-30
FR631088A (fr) 1927-12-14
GB269154A (en) 1927-09-08
DE567095C (de) 1932-12-28

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