EP0527323A1 - Schneckenförderer - Google Patents

Schneckenförderer Download PDF

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Publication number
EP0527323A1
EP0527323A1 EP92111318A EP92111318A EP0527323A1 EP 0527323 A1 EP0527323 A1 EP 0527323A1 EP 92111318 A EP92111318 A EP 92111318A EP 92111318 A EP92111318 A EP 92111318A EP 0527323 A1 EP0527323 A1 EP 0527323A1
Authority
EP
European Patent Office
Prior art keywords
screw
screw feeder
angular
thread
housing
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.)
Granted
Application number
EP92111318A
Other languages
English (en)
French (fr)
Other versions
EP0527323B1 (de
Inventor
Károly Bene
Lászlo Berényi
István Kovács
Endre Toth
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.)
Valmet AB
Original Assignee
Sunds Defibrator Industries AB
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 Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of EP0527323A1 publication Critical patent/EP0527323A1/de
Application granted granted Critical
Publication of EP0527323B1 publication Critical patent/EP0527323B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/22—Disintegrating in mills in magazine-type machines with screw feed
    • 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
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices
    • 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

Definitions

  • the screw feeder comprises a conically shaped housing with a screw having a continuous thread for advancing the material through the housing while simultaneously compressing the material.
  • Screw feeders of this kind are used in the cellulose industry in places where an air-tight material plug is desired for rendering it possible to feed the material against a high pressure (e.g. liquid column and gas pressure). Such screw feeders, thus, are often used for feeding lignocellulose-containing material into an impregnation vessel or digester.
  • a high pressure e.g. liquid column and gas pressure
  • the resulting particles are only with difficulty accessible for the take-up of chemicals and thereby for deliginification, for example in the digestion and bleaching processes.
  • the particles are difficult to separate from the delignified/defibered part of the pulp because of their small dimensions and their density being close to that of the pulp fibres. In the final paper product, the particles appear as small grains or glaze spots.
  • the present invention implies that the aforesaid problems can be reduced.
  • the wear on the screw feeder is reduced, and at the same time problems with glaze spots are avoided. This in its turn has resulted in reduced chemical consumption and improved pulp properties.
  • Fig. 1 shows a screw feeder according to the invention.
  • Figs. 2 and 3 show two embodiments of a portion of the screw thread on an enlarged scale.
  • the screw feeder 1 comprises a conical housing 2 and a screw 3 with a screw thread 4.
  • the screw 3 is driven by a motor 5.
  • the material is intended to be supplied through the inlet 6 and be discharged in the form of a plug through the outlet 7, in this case to a pressure vessel 8, e.g. a digester.
  • the liquid possibly pressed out by the compression of the material is collected in a casing 9.
  • the housing 2 preferably is formed with longitudinal grooves or exchangeable bars, which are intended to ensure that the material advances by counteracting that the material rotates with the screw.
  • the outlet 7 can be formed conically widening, conically tapering or cylindric, smooth or grooved.
  • the feed side 10 of the screw thread 4 i.e. the side acting against the advancing material, is formed so that at least the outer portion is angular so as to form an obtuse angle ⁇ (>90°) with the surrounding housing 2.
  • ⁇ >90°
  • the greater part of the feed side 10 is angular in this way, while according to Fig. 3 only the outermost portion 11 is angular in this way and the inwardly located portion is angular in the other direction.
  • the angle ⁇ suitably should be between 90 and 130 degrees,. preferably between 95 and 105 degrees.
  • This configuration of the screw thread implies that fine material and other small particles are prevented from penetrating into the gap between the screw thread 4 and the surrounding housing 2. It is thereby prevented that large radial forces and serious wear of the flanks of the screw thread as well as of the surrounding housing 2 can arise. It was further observed that the aforesaid plastic deformation of the raw material and problems resulting therefrom are reduced substantially.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Screw Conveyors (AREA)
  • Paper (AREA)
  • Rotary Pumps (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
EP92111318A 1991-08-08 1992-07-03 Schneckenförderer Expired - Lifetime EP0527323B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9102307A SE468599B (sv) 1991-08-08 1991-08-08 Skruvmatare foer lignocellulosahaltigt material
SE9102307 1991-08-08

Publications (2)

Publication Number Publication Date
EP0527323A1 true EP0527323A1 (de) 1993-02-17
EP0527323B1 EP0527323B1 (de) 1995-11-29

Family

ID=20383426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111318A Expired - Lifetime EP0527323B1 (de) 1991-08-08 1992-07-03 Schneckenförderer

Country Status (4)

Country Link
EP (1) EP0527323B1 (de)
AT (1) ATE130885T1 (de)
DK (1) DK0527323T3 (de)
SE (1) SE468599B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005326A2 (en) * 1995-07-31 1997-02-13 Dedini S/A Administração E Participações A feeding device for high pressure digestors

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE133227C1 (de) *

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE133227C1 (de) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005326A2 (en) * 1995-07-31 1997-02-13 Dedini S/A Administração E Participações A feeding device for high pressure digestors
WO1997005326A3 (en) * 1995-07-31 1997-03-06 Dedini S A Administracao E Par A feeding device for high pressure digestors

Also Published As

Publication number Publication date
SE468599B (sv) 1993-02-15
ATE130885T1 (de) 1995-12-15
EP0527323B1 (de) 1995-11-29
SE9102307A (de) 1993-02-09
SE9102307D0 (sv) 1991-08-08
DK0527323T3 (da) 1996-02-26

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