GB460812A - Improvement in methods of producing paper pulp from fibrous materials - Google Patents
Improvement in methods of producing paper pulp from fibrous materialsInfo
- Publication number
- GB460812A GB460812A GB499/36A GB49936A GB460812A GB 460812 A GB460812 A GB 460812A GB 499/36 A GB499/36 A GB 499/36A GB 49936 A GB49936 A GB 49936A GB 460812 A GB460812 A GB 460812A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibre
- lbs
- chlorine
- per cent
- sodium
- 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
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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
Landscapes
- Paper (AREA)
Abstract
Paper pulp is produced from decorticated bast fibre, e.g. flax or hemp, by submitting the fibre to the action of water, washing the same, cooking the fibres in a digester under a pressure of over 30 lbs./sq. inch and in the presence of an alkaline substance and a soluble sulphite, treating the product with chlorine in the presence of water, washing the conglomerate obtained and then treating the latter with an alkaline hypochlorite. The mechanically decorticated material, e.g. flax should contain approximately 90 per cent crude bast fibre. It is steeped, if desired together with a crushing action (e.g. in a beater or rod mill) in hot or cold water for 15--30 minutes, then thoroughly washed, and cooked in a rotary digester for approximately 2 hours under a pressure of 30--75 lbs./sq. inch with a mixture of approximately 95 per cent of alkali, e.g. calcium hydroxide, sodium carbonate or sodium hydroxide or a mixture thereof and about 5 per cent sodium sulphite. The proportion of alkali should be 5--15 per cent of the dry weight of the fibre. The digester is then blown and the fibre thoroughly washed, and then treated for 15--30 minutes with chlorine water, hypochlorous acid, or gaseous chlorine in the approximate proportion of 2--3 grams of chlorine for each 100 grams of conglomerate. After washing, if desired with dilute sodium hydroxide or sodium carbonate, the material is treated with sodium or calcium hypochlorite for about 7 hours. The equivalent of 2--4 lbs. of ordinary bleaching powder is used per 100 lbs. of conglomerate. The pulp is then finally washed and is ready for making high grade paper.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15620A US2018490A (en) | 1935-04-10 | 1935-04-10 | Method of producing paper pulp from fibrous material |
Publications (1)
Publication Number | Publication Date |
---|---|
GB460812A true GB460812A (en) | 1937-02-04 |
Family
ID=21772490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB499/36A Expired GB460812A (en) | 1935-04-10 | 1936-01-06 | Improvement in methods of producing paper pulp from fibrous materials |
Country Status (3)
Country | Link |
---|---|
US (1) | US2018490A (en) |
FR (1) | FR800563A (en) |
GB (1) | GB460812A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706159A (en) * | 1951-03-09 | 1955-04-12 | American Enka Corp | Manufacture of artificial sponges |
US2823121A (en) * | 1952-05-27 | 1958-02-11 | Rayonier Inc | Wood pulp preparation |
US2924547A (en) * | 1954-11-08 | 1960-02-09 | Hawaiian Dev Company Ltd | Rapid neutral sulfite process for pulping bagasse and other non-woody plant lignocellulose |
-
1935
- 1935-04-10 US US15620A patent/US2018490A/en not_active Expired - Lifetime
-
1936
- 1936-01-06 GB GB499/36A patent/GB460812A/en not_active Expired
- 1936-01-13 FR FR800563D patent/FR800563A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2018490A (en) | 1935-10-22 |
FR800563A (en) | 1936-07-08 |
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