EP0034560A2 - Verfahren und Vorrichtung zur zweckmässigen Herstellung von Cellulosebrei mittels des thermo-mechanischen Aufschlussverfahrens - Google Patents

Verfahren und Vorrichtung zur zweckmässigen Herstellung von Cellulosebrei mittels des thermo-mechanischen Aufschlussverfahrens Download PDF

Info

Publication number
EP0034560A2
EP0034560A2 EP81630016A EP81630016A EP0034560A2 EP 0034560 A2 EP0034560 A2 EP 0034560A2 EP 81630016 A EP81630016 A EP 81630016A EP 81630016 A EP81630016 A EP 81630016A EP 0034560 A2 EP0034560 A2 EP 0034560A2
Authority
EP
European Patent Office
Prior art keywords
conveyor means
chips
steam
mass
refiner
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Withdrawn
Application number
EP81630016A
Other languages
English (en)
French (fr)
Other versions
EP0034560A3 (de
Inventor
Llewellyn E. Clark
George E. Rosato
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.)
Beloit Corp
Original Assignee
Beloit Corp
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
Application filed by Beloit Corp filed Critical Beloit Corp
Publication of EP0034560A2 publication Critical patent/EP0034560A2/de
Publication of EP0034560A3 publication Critical patent/EP0034560A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • 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
    • 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
    • D21B1/26—Driving or feeding arrangements

Definitions

  • This invention is in the field of thermo-mechanical pulping methods and apparatus wherein wood chips are steamed and then compacted before delivery to a refiner.
  • the specific improvement of the present invention centers around a conveyor stage which receives the steamed and compressed wood chips in the form of a compacted mass and shreds the same while delivering it to the input of a refiner, thereby providing a more uniform feed into the refiner stage.
  • thermo-mechanical pulping and refining has become commercially accepted.
  • wood chips from a chip bin are fed through a chip washing system and then by means of a screw feed are fed into a rotary feeder valve which feeds the chips to a steaming tube operating at superatmospheric pressures.
  • the material is introduced into one end of the tube and is conveyed by means of a screw type conveyor to the outlet end.
  • the wood chips are contacted with steam from multiple steam jets which maintain a uniform steam pressure throughout the length of the tube.
  • the material passes through a first stage pressurized refiner to which there is coupled a blow valve.
  • the mixture of steam and pulp is then passed to a cyclone separator and a conveyor system delivers the pulp freed from the steam in the separator to a second stage refiner which is non-pressurized.
  • the pulp produced in the second stage refiner is then passed into a stock chest and then goes through the various other stages which are common to any procedure for making up a suspension of fibers suitable for use in a headbox.
  • U . S . Patent No. 3,921,918 describes a method for mechanically refining which involves pretreating fibrous material with steam in a preheater followed by refining the steam treated material in a disc refiner under conditions which generate steam, with at least a part of the developed steam being directed back to the preheater.
  • U . S . Patent No. 3,661,328 describes a pulp refining system using a multi-stage disc refining.
  • the refining is carried out in a pressurized environment under moderately elevated temperatures.
  • Subsequent disc refining steps are carried out under atmospheric pressure conditions.
  • the multi-stage refining process is said to result in a reduction in the bulk of the fiber furnished.
  • thermo-mechanical pulping process a plug screw feeder feeds compacted, macreated chips to a first-stage refiner. Difficulties have arisen because of the uneven feed presented to the refiner, since the compacted material tends to remain in the form of lumps of various sizes. When the compacted chips are forced along the horizontal inlet pipe by material behind them, the chips tend to drop spasmodically out of the end of the pipe where the pipe meets the vertical steam separation chamber. This causes large fluctuations in the rate at which chips reach the refiner and consequently causes substantial fluctuation in refiner loading. The net result is that pulp quality is not uniform and this uneven type of operation is generally considered to be unsatisfactory.
  • the present invention provides a method and apparatus for correcting the difficulties encountered in the feeding of thermo-mechanical pulp to a refiner.
  • the present invention provides a method wherein the wood chips are contacted with gaseous steam at a temperature and for a time sufficient to bring the temperature of the chips close to that of the steam, the resulting steam treated chips are compacted while being mechanically conveyed to reduce the moisture content thereof and produce a compacted moist mass.
  • the compacted mass is then shredded by means of further conveying under more severe conditions than the original conveying and thereafter the shredded mass of fairly uniform size is introduced into the inlet of a refiner.
  • the chips are preferably compacted at compaction ratios of at least 2.5 to 1 during the original conveying.
  • the contacting with gaseous steam preferably occurs at ambient pressure conditions, and the initial compaction of the steam treated chips is carried out until the moisture content is at least as low as 30%.
  • first and second conveyor means which each take the form of worm-type conveyors coaxially mounted with respect to each other, with the second conveyor means having one end received in the end of the first conveyor means.
  • the second conveyor may be provided with flights which have a larger pitch than the flights of the first conveyor.
  • the second conveyor can be driven at a higher rate of speed.
  • the first and second conveyors may each have oppositely oriented flights, and have drive means which drive the two conveyors in opposite directions.
  • the objective to be achieved by the second conveyor is to tend to pull the compacted mass from the first conveyor at a rate which is faster than it is being delivered by the first conveyor thereby breaking up the compacted mass and feeding the chips to the refiner at a more or less unif orm rate.
  • the residence time of the wood chips in the chip bin during steaming is typically on the order of 1 to 5 minutes, or at least sufficient to bring the chips to a temperature approximating the temperature of the steam (212°F, 100°C).
  • the chips are delivered to a plug screw feeder 15 driven by a motor 16.
  • the plug screw feeder 15 the atmospheric pressure of the chip bin 10 is isolated from the superatmospheric pressure existing in a first refiner stage 16.
  • the plug screw feeder 15 delivers the chip through a vertical steam separating tube 17 into an inlet conveyor 18 of the .first refiner stage 16.
  • the steamed chips are subjected to substantial compression whereby the moisture content is reduced to as low as 30% or preferably as low as 25%, in contrast to conventional plug feeder operation which reduces the moisture to about 50%.
  • the higher compaction ratios used being on the order of at least 2.5 to 1 or preferably 2.7 to 1 as compared with a normal compression ratio of 1.9 to 1 in these devices, fractures bonds between fibers in the chips to a greater extent than normal, enabling the first stage of refining to be operated at a reduced power level.
  • the mass of swollen, steamed wood chips is further broken up before the wood chips enter the tube 17.
  • an assembly of the type shown in Figs. 2 and 3 of the draw- in gs may be used.
  • the end of the plug screw feeder 15 terminates in a hollow frusto-conical portion 15a and an annular flange 15b.
  • the flange 15b is connected by means of bolts 19 to a flange 20a of a hollow frusto-conical coupling section 20.
  • This section has a marginal annular flange 20b which is secured by means of bolts 21 to a uniform diameter coupling section 22 having an annular flange 22a at one end abutting the flange 20b, and an annular flange 22b at the opposite end which is secured to an annular flange 17a of the tube 17.
  • the plug screw feeder 15 there is a shaft 23 having screw conveyor flights 24 which move the steamed chips after rather severe compaction toward the tube 17 and ultimately into the first refiner stage 16.
  • the end of the shaft 23 is suitably recessed to provide space for accepting a sleeve type bearing 25 which receives a reduced diameter end portion 26a of a stub shaft which is positioned within a hollow extractor screw shaft 26.
  • the opposite end of the hollow shaft 26 is secured by means of weld deposits 27 to a drive shaft 28 journaled for rotation within a bearing 29 and driven by a motor 30 through a speed reducer 31.
  • the hollow shaft 26 carries flights 32 of progressively increasing radius as shown in Figs. 2 and 3.
  • the pitch of the screw flights 32 is larger than the pitch of the screw flights 24 of the feeding screws. Consequently, if the shafts 23 and 26 are rotated at the same speed, the flights 32 will tend to pull away the compacted material being delivered by the flights 24 at a greater rate of speed than it is being delivered. This action tends to break up the mass of steamed wood chips into smaller particles which uniformly fall by means of gravity through the tube 17 and end up in the inlet conveyor 18 feeding the first refiner stage 16.
  • the shaft 26 can be at a greater speed than the shaft 23 in which case the pitch of the flights 32 and 24, respectively, can be the same.
  • the speed of the shaft 26 can be greater than the rotational speed of the shaft 23 and the flights 32 also have a longer pitch than the flights 24. The important thing is that the flights 32 provide a shredding action to break up the compressed mass being delivered by means of the plug screw feeder 15 into relatively small pieces.
  • the first stage refiner 16 operates at a pressure of about 20 to 30 psi gauge (138 to 552 KPa).
  • the refiner itself is preferably a horizontal single disc refiner of the type available commercially from the Beloit Corporation under their trademark "Uni-Mount". Basically, this type of refiner has a single dynamically balanced disc driven by a synchronous or induction motor.
  • steam is generated and this steam can be conveniently used as a source for the steam in the line 13 by providing a conduit 34 extending from the pressurized tube 17 into the gate valve 14.
  • the refined material leaves through a line 40.
  • a shaft 35 forming part of the plug screw feeder and having flights 36 forcing the compacted mass to the right as shown in Fig. 4.
  • the extractor screw makes use of a hollow shaft 37 which is coupled to the plug screw shaft 35 in the same manner as illustrated in Fig. 2.
  • the flights 38 in the extractor screw are oppositely oriented with respect to the flights 36, and the shaft 37 is driven in the opposite direction from the shaft 35. The shredding action still occurs as the material is delivered from the flights 36 into the flights 38.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Disintegrating Or Milling (AREA)
EP81630016A 1980-02-14 1981-02-13 Verfahren und Vorrichtung zur zweckmässigen Herstellung von Cellulosebrei mittels des thermo-mechanischen Aufschlussverfahrens Withdrawn EP0034560A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12137980A 1980-02-14 1980-02-14
US121379 1980-02-14

Publications (2)

Publication Number Publication Date
EP0034560A2 true EP0034560A2 (de) 1981-08-26
EP0034560A3 EP0034560A3 (de) 1981-09-02

Family

ID=22396325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81630016A Withdrawn EP0034560A3 (de) 1980-02-14 1981-02-13 Verfahren und Vorrichtung zur zweckmässigen Herstellung von Cellulosebrei mittels des thermo-mechanischen Aufschlussverfahrens

Country Status (7)

Country Link
EP (1) EP0034560A3 (de)
JP (2) JPS56128388A (de)
AU (1) AU6734881A (de)
CA (1) CA1136912A (de)
ES (1) ES8201662A1 (de)
FI (1) FI810330L (de)
GB (1) GB2069560B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138484A3 (de) * 1983-10-20 1986-07-02 Kamyr Ab Mechanischer Aufschluss von Papierbrei
WO1999007935A1 (en) * 1997-08-08 1999-02-18 Andritz Inc. Method of pretreating lignocellulose fiber-containing material for the pulp making process
GB2401069A (en) * 2003-03-10 2004-11-03 Andritz Ag Maschf Processing lignocellulose materials
CN119549257A (zh) * 2024-12-10 2025-03-04 德明神州生物工程(北京)有限公司 一种基于热磨浆系统的固本培元滋补膏及其制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB569370A (en) * 1942-06-20 1945-05-22 American Defibrator Improvements in apparatus for the production of wood or like fibrous pulp
US2931586A (en) * 1957-08-16 1960-04-05 American Defibrator Grinding device for the breaking down of wood fibres
US3471364A (en) * 1966-06-20 1969-10-07 Bauer Bros Co Apparatus for subjecting cellulosic material to counterflow of conditioning fluid
CA1074606A (en) * 1977-06-08 1980-04-01 Llewellyn E. Clark Method and apparatus for thermo-mechanical pulping

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138484A3 (de) * 1983-10-20 1986-07-02 Kamyr Ab Mechanischer Aufschluss von Papierbrei
WO1999007935A1 (en) * 1997-08-08 1999-02-18 Andritz Inc. 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
GB2401069A (en) * 2003-03-10 2004-11-03 Andritz Ag Maschf Processing lignocellulose materials
GB2401069B (en) * 2003-03-10 2006-01-04 Andritz Ag Maschf Process and device for discharging wood chips from a digester and conveying the raw material to a refiner
CN119549257A (zh) * 2024-12-10 2025-03-04 德明神州生物工程(北京)有限公司 一种基于热磨浆系统的固本培元滋补膏及其制备方法

Also Published As

Publication number Publication date
CA1136912A (en) 1982-12-07
JPS56128388A (en) 1981-10-07
JPS60165497U (ja) 1985-11-02
FI810330A7 (fi) 1981-08-10
FI810330L (fi) 1981-08-15
EP0034560A3 (de) 1981-09-02
GB2069560B (en) 1983-11-09
GB2069560A (en) 1981-08-26
JPS6348720Y2 (de) 1988-12-14
ES500079A0 (es) 1982-01-01
AU6734881A (en) 1981-10-01
ES8201662A1 (es) 1982-01-01

Similar Documents

Publication Publication Date Title
US4283252A (en) Method and apparatus for producing fiber pulp from fibrous lignocellulose containing material
US4235665A (en) Method and apparatus for producing fiber pulp in a steam pressurized grinding system
US6899791B2 (en) Method of pretreating lignocellulose fiber-containing material in a pulp refining process
US2323194A (en) Apparatus for the production of pulp from cellulosic material
EP0113353B1 (de) Verfahren und vorrichtung zur herstellung einer faserpulpe aus faserigem lignocellulosematerial
CZ293998B6 (cs) Způsob a zařízení pro zpracování vláknité suroviny
US4986480A (en) Method and apparatus for feeding a conical refiner
US5034099A (en) Apparatus for the manufacture of fiber pulp using a preheater, defibrator and horizontal separator
US3617433A (en) Defibering discharger for continuous digesters
CA1051151A (en) Apparatus and process for producing kraft type pulp
CA1136912A (en) Method and apparatus for efficiently producing cellulosic pulp by the thermo mechanical pulping method
CA1074606A (en) Method and apparatus for thermo-mechanical pulping
US2374046A (en) Method of disintegrating cellulosecontaining structures
US3644170A (en) Fibrilating fibrous pulp stock in a gas stream
US5076892A (en) Apparatus for pressurized refining of lignocellulose material
US3238088A (en) Continuous digesting of cellulosic fibrous material at decreasing pressure with mechanical defibering therebetween
US3089655A (en) Processing waste paper or the like
WO2000052256A1 (en) Feed preconditioning for chemical pulping
US4231136A (en) Bagasse depithing
US2821476A (en) Flow-eveners for wood chip digesters
US3688345A (en) Method for processing fibrous stalks
US2993537A (en) Pulp manufacture
US5967435A (en) Chip conditioner drive
US1803443A (en) Process of preparing fiber from wood and wood waste
US1861184A (en) Method for converting liquid paper pulp into a consistent mass suitable for storage, etc., or into bales for shipment

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT NL SE

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT NL SE

17P Request for examination filed

Effective date: 19811124

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840103

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ROSATO, GEORGE E.

Inventor name: CLARK, LLEWELLYN E.