US3910505A - Method of producing fiber pulp from vegetable of fibrous material - Google Patents

Method of producing fiber pulp from vegetable of fibrous material Download PDF

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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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Expired - Lifetime
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US459899A
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English (en)
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Rolf Bertil Reinhall
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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.

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  • Paper (AREA)
  • Disintegrating Or Milling (AREA)
  • Artificial Filaments (AREA)
US459899A 1973-04-27 1974-04-11 Method of producing fiber pulp from vegetable of fibrous material Expired - Lifetime US3910505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7306030A SE372299B (enrdf_load_stackoverflow) 1973-04-27 1973-04-27

Publications (1)

Publication Number Publication Date
US3910505A true US3910505A (en) 1975-10-07

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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

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US (1) US3910505A (enrdf_load_stackoverflow)
JP (1) JPS5425121B2 (enrdf_load_stackoverflow)
CA (1) CA1013600A (enrdf_load_stackoverflow)
FI (1) FI52125C (enrdf_load_stackoverflow)
FR (1) FR2227055B1 (enrdf_load_stackoverflow)
GB (1) GB1462995A (enrdf_load_stackoverflow)
NO (1) NO142001C (enrdf_load_stackoverflow)
SE (1) SE372299B (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
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 (de) * 1976-08-06 1978-02-09 Isel Sa Eine art, die in der zerfaserungszone entwickelte waerme auszunutzen, um den dampfdruck bei der herstellung von faserstoff fuer die erzeugung von faserplatten auf ein minimum abzusenken
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 (zh) * 2011-09-30 2011-12-21 浙江凯丰纸业有限公司 盘磨机恒量定压打浆方法和装置
CN108468242A (zh) * 2018-05-15 2018-08-31 朱灵美 一种低碳环保的卫生纸再生利用装置
CN109537337A (zh) * 2018-07-16 2019-03-29 广西综改咨询服务有限公司 一种造纸用木材粉碎研磨装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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 (fi) * 1978-02-16 1980-11-10 Tampella Oy Ab Foerfarande och slipverk foer avlaegsning av slipmassa vid slipning av ved under tryck
IT1112416B (it) * 1978-03-21 1986-01-13 Voith Gmbh J M Procedimento e dispositivo per la fabbricazione di pasta di legno
SE427759B (sv) * 1981-10-16 1983-05-02 Sca Development Ab Sett att reducera energiforbrukningen, mojliggora hoga rotationshastigheter och forbettra massakvaliteten vid mekanisk bearbetning av cellulosahaltigt material i malapparater samt anordning for genomforande av settet
SE429874B (sv) * 1982-02-16 1983-10-03 Sunds Defibrator Sett och anordning vid framstellning av fibermassa an lignocellulosahaltigt material

Citations (6)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 (de) * 1976-08-06 1978-02-09 Isel Sa Eine art, die in der zerfaserungszone entwickelte waerme auszunutzen, um den dampfdruck bei der herstellung von faserstoff fuer die erzeugung von faserplatten auf ein minimum abzusenken
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 (zh) * 2011-09-30 2011-12-21 浙江凯丰纸业有限公司 盘磨机恒量定压打浆方法和装置
CN108468242A (zh) * 2018-05-15 2018-08-31 朱灵美 一种低碳环保的卫生纸再生利用装置
CN108468242B (zh) * 2018-05-15 2020-07-14 温州捷高科技有限公司 一种低碳环保的卫生纸再生利用装置
CN109537337A (zh) * 2018-07-16 2019-03-29 广西综改咨询服务有限公司 一种造纸用木材粉碎研磨装置

Also Published As

Publication number Publication date
JPS5425121B2 (enrdf_load_stackoverflow) 1979-08-25
SE372299B (enrdf_load_stackoverflow) 1974-12-16
CA1013600A (en) 1977-07-12
JPS5013601A (enrdf_load_stackoverflow) 1975-02-13
FR2227055B1 (enrdf_load_stackoverflow) 1978-01-27
GB1462995A (en) 1977-01-26
NO142001C (no) 1980-06-11
DE2415685A1 (de) 1974-11-14
NO741211L (no) 1974-10-29
FI52125C (fi) 1977-06-10
FR2227055A1 (enrdf_load_stackoverflow) 1974-11-22
DE2415685B2 (de) 1977-03-03
NO142001B (no) 1980-03-03
FI52125B (enrdf_load_stackoverflow) 1977-02-28

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