US3910505A - Method of producing fiber pulp from vegetable of fibrous material - Google Patents
Method of producing fiber pulp from vegetable of fibrous material Download PDFInfo
- Publication number
- US3910505A US3910505A US459899A US45989974A US3910505A US 3910505 A US3910505 A US 3910505A US 459899 A US459899 A US 459899A US 45989974 A US45989974 A US 45989974A US 3910505 A US3910505 A US 3910505A
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- pressure
- receptacle
- grinding
- steam
- preheating
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
Definitions
- ABSTRACT The invention relates to the production of fiber pulp from fibrous vegetable material by a process generally comprising the steps of preheating the starting materialin a closed receptacle by means of steam and thereafter grinding said preheated material between the grinding discs enclosed in a casing of a grinding apparatus under superatmospheric pressure.
- the invention provides novel means for maintaining the pressure difference in consideration by introducing another gaseous pressure agent than steam into the preheating receptacle. This renders possible to keep the starting material in the receptacle at a lower temperature than that corresponding to that of a pure steam atmosphere under the same increased pressure.
- the additional pressure generated in the preheating vessel by the introduced other gaseous agent also assists in the discharge of the ground produce from the grinding casing upon treatment between the grinding discs.
- the additional gaseous agent can also be used as a cooling agent.
- the reduced temperature in the preheating vessel protects the material to be ground, in particular wood chips to be subjected to the so called thermomechanical grinding method, against discoloration and improves also the grindability of said material.
- this invention relates to a method in the production of fiber pulp from vegetable or iibrous material such as wood chips and comprising preheating of the starting material in a closed receptacle by means of steam and thereafter grinding said material under superatmospheric pressure in a grinding apparatus between grinding discs provided therein.
- the preheating temperature may be below or over 100C, and hitherto the pressure in the receptacle has been adjusted to correspond with the desired temperature.
- the preheated starting material such the chips are introduced into the grinding apparatus steam is generated during the grinding between the grinding discs.
- steam is generated during the grinding between the grinding discs.
- One main object of the invention is to provide a method which in a more reliable manner than hitherto renders possible to maintain a higher pressure in the preheating receptacle than in the grinding casing.
- Another object of the invention is to provide a method which in addition facilitates the discharge of the pulp ground between the grinding disc from the casing enclosing said disc.
- Still another object of the invention is to provide a method by which the properties of the ground produce are improved over the optimum results obtainable hitherto by a grinding treatment of the kind in consideration in particular by avoiding the danger of discolor. ation of the pulp.
- another gaseous agent than steam is supplied to the preheating receptacle in order to maintain the required higher pressure therein.
- the pressure agent supplied to the receptacle further has a cooling effect also inside the grinding Zone between the grinding discs at the moment when the fibers are uncovered from one another.
- FIG. 10 denotes a storage bin for the starting material such as wood in disintegrated state or so called chips.
- the starting material is introduced by a feeding device 12 such as a screw, into a vessel or receptacle 14 which is maintained under a predetermined pressure, the feeding device sealing against said pressure.
- the vessel 14 is at its bottom through a conveyer screw 16 connected to a grinding apparatus 18 of the disc type which comprises a closed casing 20 within which are located a stationary grinding disc 22 and a grinding disc 28 mounted within the frame 26 rotatably about a shaft 24.
- the starting material supplied by the conveyer screw 16 is fed through a central opening at the inner periphery of an interspace 31 existing between the two grinding discs 22, 28.
- the surrounding grinding casing 20 has e.g. at its bottom an outlet 32 which houses an exhaust valve 34 by which the free passage area of the outlet is controlled.
- the outlet 32 may over a duct 36 communicate with a centri-cleaner 38 for separating off the steam accompanying the ground produce.
- a valve 42 is mounted in the pipe 40 which valve is actuated by an implement 44 sensing the temperature within the zone and a temperature regulating device 46 so that a desired temperature is maintained in the vessel 14. This temperature may be below or over C and may amount to 90 C, for example. At the same time, a steam pressure at or exceeding atmospheric pressure may prevail in the vessel.
- the pipe 48 may also include a non-return valve 52.
- a pipe 54 from a source (not shown) of compressed air opens into the vessel 14, said pipe housing a valve 56 which controls the supply of compressed air to the vessel 41 through an implement 58 sensing the pressure in the interior of the vessel and a regulator 60 for adjustment to desired pressure in the vessel.
- the starting material which is supplied to the preheater vessel 14 contains water to 30 60 percent, for example. This material is preheated inside the vessel to predetermined temperature before it is fed by the conveyer screw into the interspace 31 between the grinding discs 22, 28. By the grinding work and the friction heat developed thereby steam is generated. In addition, steam can be supplied to the casing through the pipe 48 in order to facilitate the discharge of the final pulp out of the grinding casing. Both these factors cause, as is well known, an increase of pressure within the grinding casing, and in order to prevent steam from penetrating backwards into the vessel 14 air is now supplied to this latter, so that required excess pressure is obtained by addition of the steam and air pressures in the vessel.
- a temperature can be maintained in the vessel which is substantially lower than that which corre sponds to an atmosphere of solely steam at the same pressure.
- the temperature of the starting material or chips in the vessel 14 can now be adjusted in the most favorable way to prevent discoloration of the chips and toobtain forced feeding of the introduced starting material through the grinding interspace 31'.
- the supplied air acts as cooling agent during the grinding procedure proper between the grinding discs and has there influence also on the brightness and, otherwise, grindability of the pulp.
- the grinding can with excellent result be effected without or with a limited addition of chemicals of conventional type such as a mixture of disulphite and sulphite, for example.
- gaseous agent may have a bleaching effect on the chips as is the case with gaseous 80:.
- the carrier agent supplied under pressure through the pipe 48 need not be steam, but may also be constituted by air, for example.
- the invention can to advantage, be combined with the structure which is disclosed in the US. Pat. applications Ser. Nos. 299,259 and 316,290 referred to above.
- the improvement comprising the step of supplying a gas other i than steam to the closed receptacle at a pressure and temperature so as to maintain the total pressure in the preheater receptacle greater than the pressure in the grinding casing without increasing the temperature in the receptacle above that temperature prevailing therein due to the preheating by steam.
- the improved method as claimed in claim 11 receptacle by a temperature sensing device,-controlling the supply of steam to the preheater receptacle in response to the temperature sensed to maintain the temperature at a desired predetermined level for preheating, sensing the total pressure in the preheater receptacle and controlling thesupply of the gas other than steam to the preheater receptacle in response to the pressure sensed to maintainthe total pressure therein greater than the pressure in the grinding casing.
- the gas other than steam supplied to the preheater receptacle is one which is capable of bleaching the vegetable fiber.
Abstract
The invention relates to the production of fiber pulp from fibrous vegetable material by a process generally comprising the steps of preheating the starting material in a closed receptacle by means of steam and thereafter grinding said preheated material between the grinding discs enclosed in a casing of a grinding apparatus under superatmospheric pressure. As the pressure in the preheating receptacle during the whole treatment of the material must exceed the superatmospheric pressure in the grinding apparatus proper in order to prevent back flow of steam and material, the invention provides novel means for maintaining the pressure difference in consideration by introducing another gaseous pressure agent than steam into the preheating receptacle. This renders possible to keep the starting material in the receptacle at a lower temperature than that corresponding to that of a pure steam atmosphere under the same increased pressure. The additional pressure generated in the preheating vessel by the introduced other gaseous agent also assists in the discharge of the ground produce from the grinding casing upon treatment between the grinding discs. The additional gaseous agent can also be used as a cooling agent. The reduced temperature in the preheating vessel protects the material to be ground, in particular wood chips to be subjected to the so called thermomechanical grinding method, against discoloration and improves also the grindability of said material.
Description
United States Patent [191 Reinhall Oct. 7, 1975 METHOD OF PRODUCING FIBER PULP FROM VEGETABLE OF FIBROUS MATERIAL Rolf Berti] Reinhall, 16
Killingevagen, S-181 64 Lidingo,
Sweden 22 Filed: Apr.1l, 1974 21 Appl. No.: 459,899
[76] Inventor:
[30] Foreign Application Priority Data Primary Examiner-Granville Y. Custer, Jr. Attorney, Agent, or FirmEric Y. Munson [57] ABSTRACT The invention relates to the production of fiber pulp from fibrous vegetable material by a process generally comprising the steps of preheating the starting materialin a closed receptacle by means of steam and thereafter grinding said preheated material between the grinding discs enclosed in a casing of a grinding apparatus under superatmospheric pressure. As the pressure in the preheating receptacle during the whole treatment of the material must exceed the superatmospheric pressure in the grinding apparatus proper in order to prevent back flow of steam and material, the invention provides novel means for maintaining the pressure difference in consideration by introducing another gaseous pressure agent than steam into the preheating receptacle. This renders possible to keep the starting material in the receptacle at a lower temperature than that corresponding to that of a pure steam atmosphere under the same increased pressure. The additional pressure generated in the preheating vessel by the introduced other gaseous agent also assists in the discharge of the ground produce from the grinding casing upon treatment between the grinding discs. The additional gaseous agent can also be used as a cooling agent. The reduced temperature in the preheating vessel protects the material to be ground, in particular wood chips to be subjected to the so called thermomechanical grinding method, against discoloration and improves also the grindability of said material.
5 Claims, 1 Drawing Figure METHOD OF PRODUCING FIBER PULP FROM VEGETABLE OF FIBROUS MATERIAL BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method of producing fiber pulp from vegetable or fibrous material.
More particularly this invention relates to a method in the production of fiber pulp from vegetable or iibrous material such as wood chips and comprising preheating of the starting material in a closed receptacle by means of steam and thereafter grinding said material under superatmospheric pressure in a grinding apparatus between grinding discs provided therein.
2. Description of the Prior Art In the prior art preheating processes the preheating temperature may be below or over 100C, and hitherto the pressure in the receptacle has been adjusted to correspond with the desired temperature. When the preheated starting material such the chips are introduced into the grinding apparatus steam is generated during the grinding between the grinding discs. To prevent back flow of steam into the receptacle it is obviously necessary to maintain a higher pressure in the receptacle than in the grinding casing.
This is especially valid if a separate gaseous carrier agent, such steam under pressure, is introduced into the grinding casing to assist in the discharge of the ground pulp from the casing or an exhaust valve provided in the outlet thereof as is disclosed e.g. in the commonly assigned co-pending U.S. Pat. application Ser. No. 299,259, filed Oct. 20, 1972, now Pat. No. 3,847,363, issued Nov. 12, 1974 and commonly assigned co-pending U.S. Pat. application Ser. No. 316,290, filed Dec. 18, 1972.
SUMMARY OF THE INVENTION One main object of the invention is to provide a method which in a more reliable manner than hitherto renders possible to maintain a higher pressure in the preheating receptacle than in the grinding casing.
Another object of the invention is to provide a method which in addition facilitates the discharge of the pulp ground between the grinding disc from the casing enclosing said disc.
Still another object of the invention is to provide a method by which the properties of the ground produce are improved over the optimum results obtainable hitherto by a grinding treatment of the kind in consideration in particular by avoiding the danger of discolor. ation of the pulp.
According to one main feature of the invention another gaseous agent than steam is supplied to the preheating receptacle in order to maintain the required higher pressure therein. In this manner it is possible to adjust the temperature in the preheater to a level which is most advantageous for the starting material e.g. for avoiding discoloring thereof. According to the invention the pressure agent supplied to the receptacle further has a cooling effect also inside the grinding Zone between the grinding discs at the moment when the fibers are uncovered from one another. By applying the invention the quality of the produced pulp, e.g. color and grindability is affected in an favorable manner. The invention is especially applicable to the so called ther momechanical method in which the grinding is effected without assistance of particular chemicals.
SHORT DESCRIPTTON OF THE DRAWING Further objects, features and advantages of the invention will become apparent from the following description considered in connection with the accompanying drawing, which diagrammatically in a lateral view shows a plant enabling to carry out the method of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing reference numeral 10 denotes a storage bin for the starting material such as wood in disintegrated state or so called chips. The starting material is introduced by a feeding device 12 such as a screw, into a vessel or receptacle 14 which is maintained under a predetermined pressure, the feeding device sealing against said pressure. The vessel 14 is at its bottom through a conveyer screw 16 connected to a grinding apparatus 18 of the disc type which comprises a closed casing 20 within which are located a stationary grinding disc 22 and a grinding disc 28 mounted within the frame 26 rotatably about a shaft 24. The starting material supplied by the conveyer screw 16 is fed through a central opening at the inner periphery of an interspace 31 existing between the two grinding discs 22, 28. The surrounding grinding casing 20 has e.g. at its bottom an outlet 32 which houses an exhaust valve 34 by which the free passage area of the outlet is controlled. The outlet 32 may over a duct 36 communicate with a centri-cleaner 38 for separating off the steam accompanying the ground produce.
Steam under superatmospheric pressure is fed from a pressure source not shown through a pipe 40 to the vessel 14. In this connection a valve 42 is mounted in the pipe 40 which valve is actuated by an implement 44 sensing the temperature within the zone and a temperature regulating device 46 so that a desired temperature is maintained in the vessel 14. This temperature may be below or over C and may amount to 90 C, for example. At the same time, a steam pressure at or exceeding atmospheric pressure may prevail in the vessel.
Through a pipe 48, within which a manually or regulator-controlled valve 50 is provided, steam can be fed to the grinding casing 20 from the pipe 40. The pipe 48 may also include a non-return valve 52.
A pipe 54 from a source (not shown) of compressed air opens into the vessel 14, said pipe housing a valve 56 which controls the supply of compressed air to the vessel 41 through an implement 58 sensing the pressure in the interior of the vessel and a regulator 60 for adjustment to desired pressure in the vessel.
OPERATION OF THE PREFERRED EMBODIMENT The starting material which is supplied to the preheater vessel 14 contains water to 30 60 percent, for example. This material is preheated inside the vessel to predetermined temperature before it is fed by the conveyer screw into the interspace 31 between the grinding discs 22, 28. By the grinding work and the friction heat developed thereby steam is generated. In addition, steam can be supplied to the casing through the pipe 48 in order to facilitate the discharge of the final pulp out of the grinding casing. Both these factors cause, as is well known, an increase of pressure within the grinding casing, and in order to prevent steam from penetrating backwards into the vessel 14 air is now supplied to this latter, so that required excess pressure is obtained by addition of the steam and air pressures in the vessel. In this way a temperature can be maintained in the vessel which is substantially lower than that which corre sponds to an atmosphere of solely steam at the same pressure. The temperature of the starting material or chips in the vessel 14 can now be adjusted in the most favorable way to prevent discoloration of the chips and toobtain forced feeding of the introduced starting material through the grinding interspace 31'. In addition, the supplied air acts as cooling agent during the grinding procedure proper between the grinding discs and has there influence also on the brightness and, otherwise, grindability of the pulp. The grinding can with excellent result be effected without or with a limited addition of chemicals of conventional type such as a mixture of disulphite and sulphite, for example.
Instead of air other gases which do not condense in the vessel or are neutral to the starting material can be utilized as pressure agent in the vessel 14. The gaseous agent may have a bleaching effect on the chips as is the case with gaseous 80:. The carrier agent supplied under pressure through the pipe 48 need not be steam, but may also be constituted by air, for example. The invention can to advantage, be combined with the structure which is disclosed in the US. Pat. applications Ser. Nos. 299,259 and 316,290 referred to above.
While one embodiment of the invention has been disclosed and described with indication of some possible modifications, it is to be understood that thisis for purpose of illustration only, and that the invention is not to be limited thereby, but its scope is to be determined by the appended claims.
What is claimed is:
1. In a method for producing fiber pulp from fibrous vegetable material wherein the fibrous material is pre heated in a closed receptacle by means of steam and thereafter ground between grinding discs under superatmospheric pressure in a grinding apparatus casing communicating with the closed receptacle, the improvement comprising the step of supplying a gas other i than steam to the closed receptacle at a pressure and temperature so as to maintain the total pressure in the preheater receptacle greater than the pressure in the grinding casing without increasing the temperature in the receptacle above that temperature prevailing therein due to the preheating by steam.
2. The improved method as claimed in claim 11 receptacle by a temperature sensing device,-controlling the supply of steam to the preheater receptacle in response to the temperature sensed to maintain the temperature at a desired predetermined level for preheating, sensing the total pressure in the preheater receptacle and controlling thesupply of the gas other than steam to the preheater receptacle in response to the pressure sensed to maintainthe total pressure therein greater than the pressure in the grinding casing. 4. The improved method as claimed in claim 1 wherein the gas other than steam supplied to the preheater receptacle is one which is capable of bleaching the vegetable fiber.
5. The improved .method as claimed in claim 2 wherein the gasintroduced into the grinding apparatus casing to further increase the pressure therein is steam. l l=
Claims (5)
1.IN A METHOD FOR PRODUCING FIBER PULP FROM FIBROUS VEGETABLE MATERIAL WHEREIN THE FIBROUS MATERIAL IS PREHEATED IN A CLOSED RECEPTACLE BY MEANS OF STEAMS AND THEREAFTER GROUND BETWEEN GRINDING DISCS UNDER SUPERATMOSPHRIC PRESSURE IN A GRINDING APPARATUS CASING COMMUNICATING WITH THE CLOSED RECEPTACLE, THE IMPROVEMENT COMPRISING THE STEP OF SUPPLYING A GAS OTHER THAN STEAM TO THE CLOSED RECEPTACLE AT A PRESSURE AND TEMPERATURE SO AS TO MAINTAIN THE TOTAL PRESSURE IN THE PREHEATER RECEPTACLE GREATER THAN THE PRESSURE IN THE GRINDING CASING WITHOUT INCREASING THE TEMPERATURE IN THE RECEPTACLE ABOVE THE TEMPERATURE PREVAILING THEREIN DUE TO THE PREHEATING BY STEAM.
2. The improved method as claimed in claim 1 wherein a gas is introduced into the grinding apparatus casing to further increase the pressure therein to facilitate the discharge of ground pulp therefrom further including the step of maintaining the pressure in the preheater receptacle at a pressure greater than the increased pressure in the casing.
3. The improved method as claimed in claim 1 further including sensing the temperature in the preheater receptacle by a temperature sensing device, controlling the supply of steam to the preheater receptacle in response to the temperature sensed to maintain the temperature at a desired predetermined level for preheating, sensing the total pressure in the preheater receptacle and controlling the supply of the gas other than steam to the preheater receptacle in response to the pressurE sensed to maintain the total pressure therein greater than the pressure in the grinding casing.
4. The improved method as claimed in claim 1 wherein the gas other than steam supplied to the preheater receptacle is one which is capable of bleaching the vegetable fiber.
5. The improved method as claimed in claim 2 wherein the gas introduced into the grinding apparatus casing to further increase the pressure therein is steam.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7306030A SE372299B (en) | 1973-04-27 | 1973-04-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3910505A true US3910505A (en) | 1975-10-07 |
Family
ID=20317326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US459899A Expired - Lifetime US3910505A (en) | 1973-04-27 | 1974-04-11 | Method of producing fiber pulp from vegetable of fibrous material |
Country Status (8)
Country | Link |
---|---|
US (1) | US3910505A (en) |
JP (1) | JPS5425121B2 (en) |
CA (1) | CA1013600A (en) |
FI (1) | FI52125C (en) |
FR (1) | FR2227055B1 (en) |
GB (1) | GB1462995A (en) |
NO (1) | NO142001C (en) |
SE (1) | SE372299B (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4009835A (en) * | 1975-04-04 | 1977-03-01 | Yhtyneet Paperitehtaat Oy Jylhavaara | Procedure and apparatus for preparation of hot groundwood |
US4037792A (en) * | 1972-10-23 | 1977-07-26 | Sca Development Aktiebolag | Continuously refining raw fibrous material to produce mechanical refiner pulp |
US4072274A (en) * | 1977-02-08 | 1978-02-07 | Yhtyneet Paperitehtaat Osakeyhtio Jylhavaara | Procedure and apparatus for preparing hot groundwood |
DE2734832A1 (en) * | 1976-08-06 | 1978-02-09 | Isel Sa | A WAY TO USE THE HEAT DEVELOPED IN THE DEVELOPMENT ZONE IN ORDER TO REDUCE THE STEAM PRESSURE DURING THE PRODUCTION OF FIBER MATERIAL FOR THE PRODUCTION OF FIBER BOARDS TO A MINIMUM |
US4236959A (en) * | 1971-12-20 | 1980-12-02 | Reinhall Rolf Bertil | Method of producing fiber pulp by grinding fibrous material in a steam environment |
US4283252A (en) * | 1976-03-19 | 1981-08-11 | Reinhall Rolf Bertil | Method and apparatus for producing fiber pulp from fibrous lignocellulose containing material |
US5358185A (en) * | 1992-12-05 | 1994-10-25 | J. M. Voith Gmbh | Method of digesting waste paper |
US6073865A (en) * | 1997-03-26 | 2000-06-13 | Voith Sulzer Papiertechnik Patent Gmbh | Process and devices for manufacturing a hot friable material |
US6165317A (en) * | 1995-06-12 | 2000-12-26 | Andritz Sprout-Bauer, Inc. | Control of refined pulp quality by adjusting high temperature pre-heat residence time |
US6250573B1 (en) * | 1997-03-26 | 2001-06-26 | Voith Sulzer Papiertechnik Patent Gmbh | Process and device for the dispersion of a fibrous paper material |
US20010050151A1 (en) * | 1997-08-08 | 2001-12-13 | Marc J. Sabourin | Method of pretreating lignocellulose fiber-containing material for the pulp making process |
US6651839B2 (en) | 2001-01-19 | 2003-11-25 | Voith Paper Patent Gmbh | Device for hot dispersing fibrous paper stock and a method hot dispersing the stock |
CN102286894A (en) * | 2011-09-30 | 2011-12-21 | 浙江凯丰纸业有限公司 | Constant quantity and pressure beating method and device of disk mill |
CN108468242A (en) * | 2018-05-15 | 2018-08-31 | 朱灵美 | A kind of toilet paper regeneration device of low-carbon environment-friendly |
CN109537337A (en) * | 2018-07-16 | 2019-03-29 | 广西综改咨询服务有限公司 | A kind of paper grade (stock) timber crushing grinding device |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5258301A (en) * | 1975-11-08 | 1977-05-13 | Matsushita Electric Ind Co Ltd | Electronic tuning circuit |
FI57980C (en) * | 1978-02-16 | 1980-11-10 | Tampella Oy Ab | FOERFARANDE OCH SLIPVERK FOER AVLAEGSNING AV SLIPMASSA VID SLIPNING AV VED UNDER TRYCK |
IT1112416B (en) * | 1978-03-21 | 1986-01-13 | Voith Gmbh J M | PROCEDURE AND DEVICE FOR THE MANUFACTURE OF WOOD PASTA |
SE427759B (en) * | 1981-10-16 | 1983-05-02 | Sca Development Ab | WANT TO REDUCE ENERGY CONSUMPTION, POSSIBLE HIGH ROTATION SPEEDS AND IMPROVE MASS QUALITY BY MECHANICAL PROCESSING OF CELLULOSIC MATERIAL IN MALA APPLIANCES AND DEVICE IMPLEMENTATION DEVICE |
SE429874B (en) * | 1982-02-16 | 1983-10-03 | Sunds Defibrator | SET AND DEVICE FOR MANUFACTURING FIBER MASS AND LIGNOCELLULOSALLY MATERIAL |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1795603A (en) * | 1928-03-08 | 1931-03-10 | Bauer Bros Co | Method of producing pulp |
US2396587A (en) * | 1941-03-20 | 1946-03-12 | American Defibrator | Apparatus for producing pulp |
US3016324A (en) * | 1957-03-07 | 1962-01-09 | Bauer Bros Co | Method and apparatus for producing wood pulp |
US3661328A (en) * | 1970-03-30 | 1972-05-09 | Bauer Bros Co | Pulp refining system and process |
US3687749A (en) * | 1968-10-23 | 1972-08-29 | Rolf Bertil Reinhall | Method for producing a moldable pulp composition for making shaped articles |
US3765611A (en) * | 1972-08-07 | 1973-10-16 | Bauer Bros Co | Refining process |
-
1973
- 1973-04-27 SE SE7306030A patent/SE372299B/xx unknown
-
1974
- 1974-04-03 NO NO741211A patent/NO142001C/en unknown
- 1974-04-09 GB GB1559674A patent/GB1462995A/en not_active Expired
- 1974-04-11 US US459899A patent/US3910505A/en not_active Expired - Lifetime
- 1974-04-18 FI FI741164A patent/FI52125C/en active
- 1974-04-23 JP JP4515574A patent/JPS5425121B2/ja not_active Expired
- 1974-04-26 CA CA198,220A patent/CA1013600A/en not_active Expired
- 1974-04-26 FR FR7414752A patent/FR2227055B1/fr not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1795603A (en) * | 1928-03-08 | 1931-03-10 | Bauer Bros Co | Method of producing pulp |
US2396587A (en) * | 1941-03-20 | 1946-03-12 | American Defibrator | Apparatus for producing pulp |
US3016324A (en) * | 1957-03-07 | 1962-01-09 | Bauer Bros Co | Method and apparatus for producing wood pulp |
US3687749A (en) * | 1968-10-23 | 1972-08-29 | Rolf Bertil Reinhall | Method for producing a moldable pulp composition for making shaped articles |
US3661328A (en) * | 1970-03-30 | 1972-05-09 | Bauer Bros Co | Pulp refining system and process |
US3765611A (en) * | 1972-08-07 | 1973-10-16 | Bauer Bros Co | Refining process |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4236959A (en) * | 1971-12-20 | 1980-12-02 | Reinhall Rolf Bertil | Method of producing fiber pulp by grinding fibrous material in a steam environment |
US4037792A (en) * | 1972-10-23 | 1977-07-26 | Sca Development Aktiebolag | Continuously refining raw fibrous material to produce mechanical refiner pulp |
US4009835A (en) * | 1975-04-04 | 1977-03-01 | Yhtyneet Paperitehtaat Oy Jylhavaara | Procedure and apparatus for preparation of hot groundwood |
US4283252A (en) * | 1976-03-19 | 1981-08-11 | Reinhall Rolf Bertil | Method and apparatus for producing fiber pulp from fibrous lignocellulose containing material |
US4457804A (en) * | 1976-03-19 | 1984-07-03 | Reinhall Rolf Bertil | Apparatus for producing fiber pulp from fibrous lignocellulose containing material |
DE2734832A1 (en) * | 1976-08-06 | 1978-02-09 | Isel Sa | A WAY TO USE THE HEAT DEVELOPED IN THE DEVELOPMENT ZONE IN ORDER TO REDUCE THE STEAM PRESSURE DURING THE PRODUCTION OF FIBER MATERIAL FOR THE PRODUCTION OF FIBER BOARDS TO A MINIMUM |
US4136831A (en) * | 1976-08-06 | 1979-01-30 | Isel S.A. | Method and apparatus for minimizing steam consumption in the production of pulp for fiberboard and the like |
US4072274A (en) * | 1977-02-08 | 1978-02-07 | Yhtyneet Paperitehtaat Osakeyhtio Jylhavaara | Procedure and apparatus for preparing hot groundwood |
US5358185A (en) * | 1992-12-05 | 1994-10-25 | J. M. Voith Gmbh | Method of digesting waste paper |
US6165317A (en) * | 1995-06-12 | 2000-12-26 | Andritz Sprout-Bauer, Inc. | Control of refined pulp quality by adjusting high temperature pre-heat residence time |
US6073865A (en) * | 1997-03-26 | 2000-06-13 | Voith Sulzer Papiertechnik Patent Gmbh | Process and devices for manufacturing a hot friable material |
US6250573B1 (en) * | 1997-03-26 | 2001-06-26 | Voith Sulzer Papiertechnik Patent Gmbh | Process and device for the dispersion of a fibrous paper material |
US6634583B2 (en) | 1997-03-26 | 2003-10-21 | Voith Paper Patent Gmbh | Process and device for the dispersion of a fibrous paper material |
US20010050151A1 (en) * | 1997-08-08 | 2001-12-13 | Marc J. Sabourin | Method of pretreating lignocellulose fiber-containing material for the pulp making process |
US6899791B2 (en) | 1997-08-08 | 2005-05-31 | Andritz Inc. | Method of pretreating lignocellulose fiber-containing material in a pulp refining process |
US6651839B2 (en) | 2001-01-19 | 2003-11-25 | Voith Paper Patent Gmbh | Device for hot dispersing fibrous paper stock and a method hot dispersing the stock |
CN102286894A (en) * | 2011-09-30 | 2011-12-21 | 浙江凯丰纸业有限公司 | Constant quantity and pressure beating method and device of disk mill |
CN108468242A (en) * | 2018-05-15 | 2018-08-31 | 朱灵美 | A kind of toilet paper regeneration device of low-carbon environment-friendly |
CN108468242B (en) * | 2018-05-15 | 2020-07-14 | 温州捷高科技有限公司 | Low-carbon and environment-friendly toilet paper recycling device |
CN109537337A (en) * | 2018-07-16 | 2019-03-29 | 广西综改咨询服务有限公司 | A kind of paper grade (stock) timber crushing grinding device |
Also Published As
Publication number | Publication date |
---|---|
GB1462995A (en) | 1977-01-26 |
SE372299B (en) | 1974-12-16 |
NO142001B (en) | 1980-03-03 |
FI52125B (en) | 1977-02-28 |
DE2415685B2 (en) | 1977-03-03 |
CA1013600A (en) | 1977-07-12 |
JPS5013601A (en) | 1975-02-13 |
NO142001C (en) | 1980-06-11 |
DE2415685A1 (en) | 1974-11-14 |
JPS5425121B2 (en) | 1979-08-25 |
FR2227055B1 (en) | 1978-01-27 |
NO741211L (en) | 1974-10-29 |
FR2227055A1 (en) | 1974-11-22 |
FI52125C (en) | 1977-06-10 |
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