GB485516A - Improved method of manufacturing pulp for paperboard - Google Patents

Improved method of manufacturing pulp for paperboard

Info

Publication number
GB485516A
GB485516A GB1878537A GB1878537A GB485516A GB 485516 A GB485516 A GB 485516A GB 1878537 A GB1878537 A GB 1878537A GB 1878537 A GB1878537 A GB 1878537A GB 485516 A GB485516 A GB 485516A
Authority
GB
United Kingdom
Prior art keywords
pulp
value
straw
added
lime
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
GB1878537A
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.)
COOEPERATIEVE VEREENIGING COOE
Original Assignee
COOEPERATIEVE VEREENIGING COOE
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 to NL47490D priority Critical patent/NL47490C/xx
Application filed by COOEPERATIEVE VEREENIGING COOE filed Critical COOEPERATIEVE VEREENIGING COOE
Priority to GB1878537A priority patent/GB485516A/en
Publication of GB485516A publication Critical patent/GB485516A/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
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives

Landscapes

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

Abstract

In manufacturing pulp for paperboard from substances such as straw digested in usual manner with milk of lime at a temperature above 100 DEG C., the calcium ions present in combined condition in the digested material are exchanged for other positive ions by treating the digested and washed pulp, with acids to a pH value of 6-6,5 followed if desired by addition of sufficient alkali to make the pulp alkaline, or with acid salts or with acids in the presence of acid reacting salts to a pH value of 4,5 to 5,5. Pulp obtained by cooking straw or mixtures of different kinds of straw with milk of lime at a temperature above 100 DEG C., is thoroughly washed and introduced to a paper forming machine. Sulphuric acid is added to the circulating water of the wire cloths of the machine to obtain a pH value of 6-6,5. A strong fairly waterproof board is produced. In a second example sulphuric acid is added in the beater to washed pulp obtained from straw by cooking with lime to produce a pH value of 6-6,5. In the paper forming machine a small excess of caustic soda is added to the circulating water. A very strong board is obtained. In a third example to the pulp in the beater is added a solution containing 4 per cent sulphuric acid and 8 per cent aluminium sulphate to produce a pH value of 4,5-5,5. A strong and perfectly waterproof board is obtained. Specification 126,879, [Class 96], is referred to.
GB1878537A 1937-07-06 1937-07-06 Improved method of manufacturing pulp for paperboard Expired GB485516A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL47490D NL47490C (en) 1937-07-06
GB1878537A GB485516A (en) 1937-07-06 1937-07-06 Improved method of manufacturing pulp for paperboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1878537A GB485516A (en) 1937-07-06 1937-07-06 Improved method of manufacturing pulp for paperboard

Publications (1)

Publication Number Publication Date
GB485516A true GB485516A (en) 1938-05-20

Family

ID=10118389

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1878537A Expired GB485516A (en) 1937-07-06 1937-07-06 Improved method of manufacturing pulp for paperboard

Country Status (2)

Country Link
GB (1) GB485516A (en)
NL (1) NL47490C (en)

Also Published As

Publication number Publication date
NL47490C (en) 1938-07-15

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