EP2377658A1 - Procédé déstiné à la fabrication d'une plaque comportant des copeaux de bois - Google Patents

Procédé déstiné à la fabrication d'une plaque comportant des copeaux de bois Download PDF

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Publication number
EP2377658A1
EP2377658A1 EP11162486A EP11162486A EP2377658A1 EP 2377658 A1 EP2377658 A1 EP 2377658A1 EP 11162486 A EP11162486 A EP 11162486A EP 11162486 A EP11162486 A EP 11162486A EP 2377658 A1 EP2377658 A1 EP 2377658A1
Authority
EP
European Patent Office
Prior art keywords
milling
rotor
vanes
starting material
mixer
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
EP11162486A
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German (de)
English (en)
Other versions
EP2377658B1 (fr
Inventor
Johan LINDSTRÖM
Kai Dahlskog
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.)
CHEMEC Oy AB
Original Assignee
CHEMEC Oy AB
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Filing date
Publication date
Application filed by CHEMEC Oy AB filed Critical CHEMEC Oy AB
Publication of EP2377658A1 publication Critical patent/EP2377658A1/fr
Application granted granted Critical
Publication of EP2377658B1 publication Critical patent/EP2377658B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • B02C13/205—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors arranged concentrically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • 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
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/063—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using grinding devices

Definitions

  • the present invention concerns a method according to the preamble of claim 1 for producing a board from a wood-based starting material.
  • the starting material such as wood chips
  • a board e.g. a particle board
  • the fraction obtained with a chipping hammer is cubically shaped which is not the optimum form for the production of a particle board.
  • the invention is based on the idea of using, for disintegration of the starting material, a continuous flow mixer working according to the impact mill principle.
  • Such a device usually has at least two milling rotors, fitted one inside the other, with milling vanes, at least one of the rotors being rotatable and at least at part of the vanes of the outermost milling rotor being arranged in an angular position with regard to the radial direction of the rotor.
  • the vanes are usually plate-like and they are placed perpendicularly against the radius of the mill (i.e. at an angle of 180 degrees). When the starting material hits the moving vane it is rapidly disintegrated into smaller particles.
  • the solution will also reduce the danger that the material which is to be disintegrated will heat up so much that its surface darkens.
  • the chips of the chips mass to be produced are suitable in size for the production of particle boards; in particular the average thickness of the chips is less than about 2 mm, typically less than 1.5 mm.
  • the structure is steady and wear of the milling vanes is small whereby greater production rates can be reached than with traditional blade grinders.
  • Disintegration of the starting material is influenced by internal chafing of the particles of the feed.
  • lack of homogeneity of the starting material is not as critical for the disintegration as when, for instance, a blade grinder is used.
  • the method according to the invention for producing wood chips suitable for the production of, e.g., particle boards comprises disintegration of the starting material to a predetermined size with a continuous flow mixer operating according to the impact mill principle, said mixer having at least two milling rotors, one inside the other, with milling vanes, at least one rotor being rotatable and at least a part of the vanes of the outermost rotor being arranged into an angular position against the radial direction of the rotor.
  • the outermost milling rotor preferably comprises a planar ring base to which milling vanes are secured in essentially perpendicular position with regard to the plane of the ring base, the milling vanes being secured to the ring base at a first end, whereas a second, opposite end is being left free.
  • the apparatus has at least one rotatable rotor.
  • the rotor can be assembled in a fixed position, i.e. it is a so-called stator. It is however preferred to use a mill where there are at least two rotatable milling rotors, preferably there are 3 to 12 rotatable milling rotors, it is particularly preferred to have 2 to 6 milling rotor pairs.
  • Figures 1 and 2 show an apparatus 1, with a frame 2, to which four ring bases 4, 5, 6 and 7, one inside the other, are rotatably pivoted with a rotatable shaft 3. Between the ring bases there is a milling or disintegration zone 8.
  • the milling or disintegration zone is formed when the ring bases 4, 5, 6 and 7 of the milling rotors define a passage through which the material which is to be disintegrated flows.
  • the ring bases are arranged on opposite sides of the passage.
  • the passage forms in this case the afore-said milling or disintegration zone 8.
  • the drawings show a case wherein the ring bases are arranged alternately on opposite sides of the passage 8, whereby the passage preferably opens radially from the inside of the mixer to the outside.
  • the distance between the planes of the ring bases 4, 5, 6 7 increases inside out.
  • the milling rotors comprise in addition to ring bases 4, 5, 6, 7 also vanes 10 and 11 secured to these.
  • Reference numeral 10 is used for designating the vanes of the inner rotors and reference numeral 11 for the vanes of the outermost rotor.
  • the inner rotors typically have vanes 10 which are quadratic or rectangular in shape in the direction of the ring base. Their number can vary freely. There can be equally many or a different number of them on different rotors, whereby in the case shown in the figure there are 9 vanes on the innermost rotor 4, the next rotor (no. 5) contains 21 vanes, then again 30 vanes and on the outermost rotor there is 24 vanes. These numbers are only indicative, generally there are 1 to 100 vanes/rotor, preferably about 2 to 75/rotor depending on the size of the apparatus.
  • the side of the vane of the outermost ring base 7 facing the rotational direction of said ring base is disposed in an angular position against the rotational direction such that the surface of the vane opens inwards to the mixer.
  • the vanes can be cut from vanes which have the shape of a square or rectangle, but they can also be such that their cross-section is primarily shaped as a parallelogram or even as a rhomb.
  • all vanes of the outermost ring do not have to be assembled in an angular position, but generally speaking at least 10 %, preferably 20 - 100 %, of the vanes of the outermost milling rotor are arranged in an angular position with regard to the radial direction of the rotor.
  • the front surface of the vanes forms preferably an angle of about 1 to 75°, in particular about 5 to 45°, preferably about 15 to 40° in the radial direction of the rotor. In the case according to Figure 1 , the angle is about 30°.
  • wood chips or wood pieces are used as a wood-containing starting material.
  • the starting material is dried to a relative moisture content of about 10 to 30 % before milling. It is also possible to feed completely non-dried, fresh wood. If the raw-material is too dry, steam, in particular pressurized steam, can be fed into the continuous flow mixer during disintegration/milling. Thus, the chips are fed into the apparatus either in dry form or together with water and steam.
  • the starting material is fed to the continuous flow mixer in the form of a steady flow.
  • the mass flux of the feed varies less than max. ⁇ 30 %, in particular at the most ⁇ 15 %, per time unit.
  • the milling rings 4, 5, 6, 7, 10 and 11 of the device are rotated with a motor (not shown) such that they generally attain a speed of about 5 to 250 m/s.
  • a motor not shown
  • every second rotor is rotated in opposite direction, whereby the speed difference between adjacent rotors will become about 10 to 500 m/s, typically about 50 - 200 m/s.
  • a mixing/shearing zone having high energy intensity is formed in the apparatus.
  • the material to be disintegrated is typically conducted through the apparatus from the center of the rotors radially outwards, the vanes present on the rotors subjecting the material, which is conducted in an outwards directed flow, to both impacts and counter-impacts. Shearing forces, turbulence and vacuum and overpressure pulses are created which exert an influence with activates the material and disintegrates it.
  • the starting material energy is used in a quantity of about 1 to 250 kWh/t of dry starting material, in particular about 10 to 100 kWh/t dry starting material, preferably about 20 to 50 kWh/t dry starting material.
  • a chip mass can be produced which is excellently suited for the production of particle boards.
  • at least 95 wt-% of the chip mass is formed by chips which have an average length of less than 4 mm and a thickness of less than 2 mm.
  • a preferred embodiment further comprises the feature that the outlet product of the mixer is recovered, it is sieved and at least a part of it is being recycled and combined with fresh feed. Dust is preferably removed from the outlet product and taken to combustion.
  • the chip mass is first dried.
  • the chips of the mass are also mostly classified before use.
  • a chip mass produced as described above is blended into an adhesive, in particular it is mixed with an adhesive which is thermally hardened.
  • the blend/mixture of chips and adhesive is spread layer-by-layer to form a blank, for example a plate-like blank, which then is taken to a hot-press where it is pressed using heat and pressure to form a uniform board. After hardening the board is cooled. If so desired the board can be mechanically processed after compressing; typically the edges are cut straight and then the boards are cut into sizes suitable for selling, they are sanded and sorted.
  • thermosets such as phenol-formaldehyde, ureaformaldehyde and melamine formaldehyde based glues can be used as adhesives.
  • Additives can be mixed into the glues and the chips, such as known fire retardants and antimoulding agents.
  • the moisture content of the wood material varies during the production process of the board.
  • the raw-material used for producing a particle board can exhibit a moisture of typically, e.g., even up to 60 to 120 %, whereat it is lowered to below a level of 10 %, e.g. to a value of 1 to 2 %, after drying. During gluing the moisture content may increase somewhat and it is then for example about 6 to 12 %.
  • the moisture content of the ready board is typically 5 to 7 %.
  • wood-based starting material for production of particle boards and corresponding composite boards represents a preferred application of the invention. It should however be pointed out that a wood mass produced by a disintegration method according to the invention is suitable for the production of other kinds of compression products formed by wood particles. Thus, it is possible to produce for example wood pellets from the mass containing wood particles which are suitable for combustion and energy production.
  • Spruce chips were disintegrated with a device as previously described, having four rotors (rotors 1 and 3 and 2 and 4, respectively).
  • the energy consumption was 2 x 55 kW.
  • the rotational speeds were 1300 / 1300 rpm; current rate was 57/65 A, 43 Hz.
  • the obtained mass was well-suited for the production of particle boards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Crushing And Pulverization Processes (AREA)
EP11162486.2A 2010-04-14 2011-04-14 Procédé destiné à la fabrication d'une plaque comportant des copeaux de bois Not-in-force EP2377658B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20105383A FI20105383A (fi) 2010-04-14 2010-04-14 Menetelmä puulastuja käsittävän levyn valmistamiseksi

Publications (2)

Publication Number Publication Date
EP2377658A1 true EP2377658A1 (fr) 2011-10-19
EP2377658B1 EP2377658B1 (fr) 2013-07-03

Family

ID=42133228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11162486.2A Not-in-force EP2377658B1 (fr) 2010-04-14 2011-04-14 Procédé destiné à la fabrication d'une plaque comportant des copeaux de bois

Country Status (2)

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EP (1) EP2377658B1 (fr)
FI (1) FI20105383A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103930615A (zh) * 2011-11-14 2014-07-16 芬欧汇川集团 一种用于生产纳米纤丝纤维素的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411724A (en) * 1965-05-29 1968-11-19 Sviluppo Silicalcite S P A Cage type disintegrator with blade shaped impacting members, particularly suited forprocessing hard materials
GB1474550A (en) * 1973-07-05 1977-05-25 Patent Anst Baustoffe Disintegrator
US4406409A (en) * 1980-09-16 1983-09-27 Joachim Durek Disintegrator and method for the operation thereof
SU1331642A1 (ru) * 1986-02-20 1987-08-23 Всесоюзный Научно-Исследовательский Институт Деревообрабатывающей Промышленности Лини подготовки древесных частиц в производстве древесно-стружечных плит
WO1998029596A1 (fr) 1997-01-03 1998-07-09 Megatrex Oy Procede et dispositif servant a defibrer un materiau contenant des fibres
WO2008122691A1 (fr) * 2007-04-10 2008-10-16 Fractivator Oy Broyeur à chocs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858079A1 (de) * 1998-12-16 2000-06-21 Edmone Roffael Verfahren zur Herstellung von mitteldichten Faserplatten (MDF) mit niedriger Dickenquellung und Wasseraufnahme

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411724A (en) * 1965-05-29 1968-11-19 Sviluppo Silicalcite S P A Cage type disintegrator with blade shaped impacting members, particularly suited forprocessing hard materials
GB1474550A (en) * 1973-07-05 1977-05-25 Patent Anst Baustoffe Disintegrator
US4406409A (en) * 1980-09-16 1983-09-27 Joachim Durek Disintegrator and method for the operation thereof
SU1331642A1 (ru) * 1986-02-20 1987-08-23 Всесоюзный Научно-Исследовательский Институт Деревообрабатывающей Промышленности Лини подготовки древесных частиц в производстве древесно-стружечных плит
WO1998029596A1 (fr) 1997-01-03 1998-07-09 Megatrex Oy Procede et dispositif servant a defibrer un materiau contenant des fibres
WO2008122691A1 (fr) * 2007-04-10 2008-10-16 Fractivator Oy Broyeur à chocs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103930615A (zh) * 2011-11-14 2014-07-16 芬欧汇川集团 一种用于生产纳米纤丝纤维素的方法
EP2794986A4 (fr) * 2011-11-14 2015-10-07 Upm Kymmene Corp Procédé de production de cellulose de nanofibrilles
CN103930615B (zh) * 2011-11-14 2016-12-07 芬欧汇川集团 一种用于生产纳米纤丝纤维素的方法
US9739011B2 (en) 2011-11-14 2017-08-22 Upm-Kymmene Corporation Method for producing nanofibrillar cellulose

Also Published As

Publication number Publication date
EP2377658B1 (fr) 2013-07-03
FI20105383A (fi) 2011-10-15
FI20105383A0 (fi) 2010-04-14

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