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
  • 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

• the present invention relates to apparatus of the kind defined in the preamble of Claim 1, for feeding and refining lignocel- lulosic fibre material.
• the fibre material concerned is first fed into a preheater in the form of a container in which the material is preheated with a heating medium, for instance with steam at atmospheric pressure or at a higher pressure.
• the material is passed from the preheater to a refiner in which fibre pulp is produced by defibering the fibre material.
• the defibra- tion is normally performed in a refiner that comprises two mutually opposing refining discs that can be rotated relative to one another and that define therebetween a refining gap in the refining zone.
• the material is fed to the refining zone radially from within and is defibered as it passes through the re- fining gap.
• the object of the present invention is to improve the defibra- tion process and also the production stability of such apparatus. This necessitates transportation of the preheated fibre to the refiner in a controlled and regulated quantity, and from there to a fibre drier through a blow line. In order to achieve this, it is necessary to be able to regulate the pressure and the flow of fibre and steam between the preheater and the refiner. It is also necessary to be able to stabilize the fibre flow after the defibration or pulping process, in order to achieve smoother sizing and drying of the pulp. Another object of the invention is to reduce the amount of energy required by the refining process and to enhance refiner capacity.
• Figure 1 is an axial sectioned view of an inventive apparatus
• Figure 2 is a side view of a guide body included in the inventive apparatus.
• Figure 3 is a side view showing a screw feeder included in the inventive apparatus.
• ligno- cellulosic fibre material e.g. in chip form
• a chip preheater 10 ligno- cellulosic fibre material
• the steam condenses on the colder chips and therewith transfers heat to the chips.
• a suspension of chips, condensate and steam is fed into a plug screw feeder 11 comprising a feed screw 12 mounted in a screw housing 13.
• the speed at which the screw 12 rotates can be varied, so as to enable the production volume of the mill to be regulated.
• a compression zone 14 is provided between the screw feeder 12 and the screw housing 13, at the outlet of the feeder.
• the stem 15 of the feed screw 12 widens conically towards the outlet at this point.
• a refiner 16 Connected to the outlet of the screw feeder is a refiner 16 that includes a refining disc 17.
• the radially outer part of the refining disc 17 carries in a defibration zone 18 refining elements that coact with fixed refining elements to defiber the fibre material.
• the fibre material entering the defibration zone 18 through the inlet 19 is guided towards said defibration zone by a central guide body 20, which is fixedly connected to the refining disc 17 and thus rotates together with the disc.
• the guide body 20 includes a guide surface 21 that curves radially outwards to- wards the defibration zone 18 of the refining disc 17.
• the guide body 20 has a plane surface 22 adjacent to the end surface of the screw 12 and forms a geometric continuation of the screw stem 15.
• Cleaning wings 24 are firmly mounted on the plane surface 22, in the gap 23 defined between the end surface of the screw 12 and said surface 22.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Disintegrating Or Milling (AREA)
• Crushing And Grinding (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20406841

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (1)

• 1997
  • 1997-05-05 SE SE9701687A patent/SE511370C2/sv not_active IP Right Cessation
• 1998
  • 1998-05-04 WO PCT/SE1998/000813 patent/WO1998050623A1/en active Application Filing

Patent Citations (1)

Also Published As

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