GB2040727A - Production of mechanical wood pulp - Google Patents
Production of mechanical wood pulp Download PDFInfo
- Publication number
- GB2040727A GB2040727A GB8000646A GB8000646A GB2040727A GB 2040727 A GB2040727 A GB 2040727A GB 8000646 A GB8000646 A GB 8000646A GB 8000646 A GB8000646 A GB 8000646A GB 2040727 A GB2040727 A GB 2040727A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid
- water
- wood pulp
- wood
- grinding
- 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- Withdrawn
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)
- Switches With Compound Operations (AREA)
- Manufacturing Of Electric Cables (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Wood is pulped by the action of a grinding member in the presence of a liquid - conventionally water. In order that the process can be carried out above 100 DEG C, either under pressure or at atmospheric pressure, a liquid is used which has a boiling point, at atmospheric pressure, above 100 DEG C.
Description
SPECIFICATION
Production of mechanical wood pulp
The invention relates to a process for the production of wood pulp in a pulp grinder with a grinding member against which wood is pressed, the grinding zone being supplied with liquid.
Hitherto, water has always been used as the liquid.
The water serves as transport means, for the cooling of the grinding member - e.g. grindstone - and also as a solvent for fibre-bonding substances. As a result of the frictional heat the grinding member becomes heated which can lead to local burning. Thus the supplied water brings about a cooling of the stone.
Moreover, the separated fibres are floated away with the water.
It has been proved that the grinding process is particularly kind to the fibres if water which has a high temperature is added. At high temperatures the lignin, the bonding agent of the wood, is softened.
Consequently, the fibres can be released from the bond much easier and with less damage. The wood pulp contains fewer fragments of fibre and much fewer splinters or groups of fibres. Furthermore, the percentage of long fibres and the strength properties of the wood pulp increase considerably. A liquid temperature of around approximately 1200C or more in the grinding zone would be optimal. At this temperature the lignin softens whereby a smaller outlay of energy is necessary for the production of the wood pulp. However, water boils at atmospheric pressure at 1000C. For this reason it has already been proposed to provide the grinder with a pressuretight housing and to grind under pressure.In this manner it is possible, e.g. at a superatmospheric pressure of from 1 to 3 bar, to achieve water temperatures of 120 to 130 C. However, this process has the disadvantage that a considerable constructional outlay is necessary and an arrangement of this type is thus very expensive.
According to the present invention there is provided a method of producing mechanical wood pulp in a wood grinder with a grinding member against which the wood is pressed while a liquid is fed to the grinding zone, the liquid having a boiling point, at atmospheric pressure, above 100"C.
The process in accordance with the invention thus allows elevated temperatures to be achieved in a simple manner and without special structural means. If the grinding process is carried out in the temperature range at which the lignin softens, a very good wood pulp can be obtained. Preferably the boiling point of the liquid which is used is above 115"C.
There are numerous liquids which meet these requirements. For this purpose both organic and inorganic liquids or solids which are dissolved accordingly in a liquid, e.g. water, can be used. For example, an aqueous solution of sodium chloride (table salt) can be used, the boiling point of the liquid being determined by the quantity of added sodium chloride. It is also possible to use high boiling-point alcohols, e.g. butyl alcohol, heptyl alcohol or benzyl alcohol having boiling points of 118"C, 176Cand 205"C respectively. Glycerol (boiling point 290"C) or a mixture of water and glycerol can likewise be used.
An aqueous solution of sodium sulphite (Na2SO3) or sodium sulphate (Na2SO4) is also possible. Obviously other liquids can be used provided that they do not impair the grinding action or, of course, corrode the apparatus used.
If desired, the liquid used can be recycled, to limit heat loss.
Although one aim of the invention is to permitthe use of temperatures above 1000C without the need for pressurised apparatus, it is also applicable to pulp grinders which are operated under pressure or in which water at super-atmospheric pressure is fed into the grinding zone. Thus, if required, a further increase in temperature can be achieved.
There is thus provided a process for the production of wood pulp by means of which a wood pulp of high quality can be produced, having a high percentage of long fibres and good strength whilst requiring relatively little energy yet not necessitating expensive apparatus.
1. A method of producing mechanical wood pulp in a wood grinder with a grinding member against which the wood is pressed while a liquid is fed to the grinding zone, the liquid having a boiling point, at atmospheric pressure, above 100"C.
2. method according to claim 1, in which the liquid has a boiling point, at atmospheric pressure, above 115 C.
3. A method according to claim 1 or 2, in which the liquid is water to which boiling point-raising agents have been added.
4. A method according to claim 3, in which the liquid is water in which a salt is dissolved.
5. A method according to claim 4, in which the salt is sodium chloride.
6. A method according to claim 4, in which the salt is sodium sulphite.
7. A method according to claim 4, in which the salt is sodium sulphate.
8. A method according to claim 1 or 2, in which the liquid is an alcohol or a mixture of an alcohol and water.
9. A method according to claim 8, in which the liquid is glycerol or a mixture of glycerol and water.
10. A method according to claim 1 substantially as herein described.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A method of producing mechanical wood pulp in a wood grinder with a grinding member against which the wood is pressed while a liquid is fed to the grinding zone, the liquid having a boiling point, at atmospheric pressure, above 100"C.
2. method according to claim 1, in which the liquid has a boiling point, at atmospheric pressure, above 115 C.
3. A method according to claim 1 or 2, in which the liquid is water to which boiling point-raising agents have been added.
4. A method according to claim 3, in which the liquid is water in which a salt is dissolved.
5. A method according to claim 4, in which the salt is sodium chloride.
6. A method according to claim 4, in which the salt is sodium sulphite.
7. A method according to claim 4, in which the salt is sodium sulphate.
8. A method according to claim 1 or 2, in which the liquid is an alcohol or a mixture of an alcohol and water.
9. A method according to claim 8, in which the liquid is glycerol or a mixture of glycerol and water.
10. A method according to claim 1 substantially as herein described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2901943A DE2901943C3 (en) | 1979-01-19 | 1979-01-19 | Process for the production of wood pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2040727A true GB2040727A (en) | 1980-09-03 |
Family
ID=6060895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8000646A Withdrawn GB2040727A (en) | 1979-01-19 | 1980-01-09 | Production of mechanical wood pulp |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5598986A (en) |
| AT (1) | AT371164B (en) |
| BE (1) | BE881180A (en) |
| BR (1) | BR5901751U (en) |
| CA (1) | CA1138697A (en) |
| CH (1) | CH645145A5 (en) |
| DE (1) | DE2901943C3 (en) |
| ES (1) | ES8102236A1 (en) |
| FI (1) | FI800123A (en) |
| FR (1) | FR2446885A1 (en) |
| GB (1) | GB2040727A (en) |
| IT (1) | IT1119612B (en) |
| NL (1) | NL7909076A (en) |
| NO (1) | NO150728C (en) |
| SE (1) | SE8000440L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109112872A (en) * | 2018-10-25 | 2019-01-01 | 泉州市大创机械制造有限公司 | A kind of multi-functional pulper |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE211047C (en) * | ||||
| DE397183C (en) * | 1923-06-19 | 1924-06-16 | Leopold Enge | Process for the production of pulp for paper manufacture |
| DE504705C (en) * | 1928-06-24 | 1930-08-07 | Chemische Werke Koholyt A G | Process for the production and processing of wood pulp and other fiber products |
| US1813988A (en) * | 1929-01-16 | 1931-07-14 | Allison R Chambers | Process for the manufacture of ground wood pulp |
| DE682070C (en) * | 1937-04-01 | 1939-10-07 | Werner Lange | Method and device for the production of wood pulp from pine wood |
| DE677504C (en) * | 1937-06-29 | 1939-06-27 | Chem Fab Coswig Anhalt Hans Sc | Process for the production of wood pulp from wood rich in resin, in particular pine wood |
| DE707894C (en) * | 1937-09-21 | 1941-07-07 | Tschimmer & Schwarz Chem Fab D | Process for the production of wood pulp, in particular from wood rich in resin |
| US2388592A (en) * | 1940-03-21 | 1945-11-06 | Defibrator Ab | Process of making ligno-cellulose pulps from straw |
| GB765690A (en) * | 1954-01-27 | 1957-01-09 | Powell River Company Ltd | Improvements in or relating to a process of producing groundwood pulp |
| FR1401560A (en) * | 1964-05-29 | 1965-06-04 | Defibrator Ab | Process for manufacturing cellulose pulp from chips in a shredder device |
-
1979
- 1979-01-19 DE DE2901943A patent/DE2901943C3/en not_active Expired
- 1979-12-03 AT AT0762679A patent/AT371164B/en not_active IP Right Cessation
- 1979-12-17 NL NL7909076A patent/NL7909076A/en not_active Application Discontinuation
- 1979-12-18 BR BR5901751U patent/BR5901751U/en unknown
- 1979-12-21 IT IT69466/79A patent/IT1119612B/en active
-
1980
- 1980-01-09 GB GB8000646A patent/GB2040727A/en not_active Withdrawn
- 1980-01-10 CH CH15180A patent/CH645145A5/en not_active IP Right Cessation
- 1980-01-14 FR FR8000948A patent/FR2446885A1/en not_active Withdrawn
- 1980-01-15 FI FI800123A patent/FI800123A/en not_active Application Discontinuation
- 1980-01-16 BE BE0/198988A patent/BE881180A/en not_active IP Right Cessation
- 1980-01-18 CA CA000343955A patent/CA1138697A/en not_active Expired
- 1980-01-18 ES ES487815A patent/ES8102236A1/en not_active Expired
- 1980-01-18 JP JP375480A patent/JPS5598986A/en active Pending
- 1980-01-18 SE SE8000440A patent/SE8000440L/en unknown
- 1980-01-18 NO NO800125A patent/NO150728C/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109112872A (en) * | 2018-10-25 | 2019-01-01 | 泉州市大创机械制造有限公司 | A kind of multi-functional pulper |
| CN109112872B (en) * | 2018-10-25 | 2023-12-05 | 厦门中乾机械有限公司 | Multifunctional pulping machine |
Also Published As
| Publication number | Publication date |
|---|---|
| NO800125L (en) | 1980-07-21 |
| FR2446885A1 (en) | 1980-08-14 |
| JPS5598986A (en) | 1980-07-28 |
| IT1119612B (en) | 1986-03-10 |
| SE8000440L (en) | 1980-07-20 |
| IT7969466A0 (en) | 1979-12-21 |
| CA1138697A (en) | 1983-01-04 |
| AT371164B (en) | 1983-06-10 |
| DE2901943A1 (en) | 1980-07-24 |
| NL7909076A (en) | 1980-07-22 |
| ES487815A0 (en) | 1980-12-16 |
| DE2901943B2 (en) | 1981-06-25 |
| ATA762679A (en) | 1982-10-15 |
| FI800123A (en) | 1980-07-20 |
| NO150728B (en) | 1984-08-27 |
| DE2901943C3 (en) | 1982-02-25 |
| BE881180A (en) | 1980-05-16 |
| ES8102236A1 (en) | 1980-12-16 |
| NO150728C (en) | 1984-12-05 |
| CH645145A5 (en) | 1984-09-14 |
| BR5901751U (en) | 1981-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |