EP0065941A2 - Method for the preparation of particle board - Google Patents

Method for the preparation of particle board Download PDF

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Publication number
EP0065941A2
EP0065941A2 EP82850116A EP82850116A EP0065941A2 EP 0065941 A2 EP0065941 A2 EP 0065941A2 EP 82850116 A EP82850116 A EP 82850116A EP 82850116 A EP82850116 A EP 82850116A EP 0065941 A2 EP0065941 A2 EP 0065941A2
Authority
EP
European Patent Office
Prior art keywords
board
surface layer
layer
fractionated
layers
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Withdrawn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
EP82850116A
Other languages
German (de)
French (fr)
Other versions
EP0065941A3 (en
Inventor
Lars-Olof Johansson
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.)
Swedspan AB
Original Assignee
Swedspan 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 Swedspan AB filed Critical Swedspan AB
Publication of EP0065941A2 publication Critical patent/EP0065941A2/en
Publication of EP0065941A3 publication Critical patent/EP0065941A3/en
Withdrawn legal-status Critical Current

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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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres

Definitions

  • the present invention relates to a method for the preparation of a particle board by building up the board in layers with a middle layer of coarse material, a surface layer of fine material on each side of the board and, optionally, one or more intermediate layers between the middle layer and each surface layer.
  • An object of the present invention is to provide a method of the above mentioned type, by means of which method a surface of throughout fine material can be obtained.
  • Another object of the invention is to provide a method of the above mentioned type, by means of which method the consumption of binder for the surface layer can be cut down and the loss of binder by material ground away can be reduced.
  • the method according to the invention provides a board with considerably higher volumetric weight and bending strength at the same percentage addition of binder and a considerably lower percentage addition of binder can be used for the attainment of the same bending strength.
  • the fractionation of the material for the surface layer in the method according to the invention is preferably carried out by methods known per se in connection with the stepless fractionation of particle material but the application of the fractionated material is carried out in reverse order in comparison with the conventional methods for the application of fractionated material, i.e. according to the invention the direction of the blowing in wind sifters is changed to be the reversed respectively the direction of rotation is changed in case of throwing rolls to be the reversed in comparison with the conventional methods.
  • a fractionation step-by-step of the material for the surface layer into two or more fractions can be used, if desired.
  • Glue-coated particles for the middle and surface layers of a three-layer board were taken from the production in the factory and were pressed to boards having a thickness of 15mm in a laboratory press at 200 0 C with a pressing time of 7 seconds/mm.
  • the material of the surface layer amounted to about 35 % by weight calculated on the weight of the total particle material.
  • the material for the surface layer was fractionated according to the invention into 2 fractions, one being in the range of 0 - 5 mm and the other above 5 mm.
  • the two fractions were strewed with the finer fraction next to the material of the middle layer and on both sides thereof and with the coarser fraction farthest.out on the two-sides of the boards.
  • Two different percentages of glue (11.5 and 7.8 % by weight calculated on the weight of the surface layer) were used, three boards being pressed at each percentage of glue.

Abstract

Method for the preparation of a particle board by building up the board in layers with a middle layer of coarse material, a surface layer of fine material on each side of the board and, optionally, one or more intermediate layers between the middle layer and each surface layer, according to which method the material for the surface layer is fractionated and applied with the finest part of the material of the surface layer next to the previous layer which in the board is placed further in and with the coarsest part of the material of the surface layer at the surface of the board and the surface layer on grinding after pressing is ground down to the desired fineness of the material at the surface of the board.

Description

  • The present invention relates to a method for the preparation of a particle board by building up the board in layers with a middle layer of coarse material, a surface layer of fine material on each side of the board and, optionally, one or more intermediate layers between the middle layer and each surface layer.
  • In the conventional preparation of multi-layer boards according to the principle related above there is either no fractionation of the material within any of the different layers or a stepless fractionation of primarily the material of the surface layer. In both cases a surface of the finished board is obtained which comprises a considerable part of comparatively coarse material. The reason for this in the case when the material of the surface layer is fractionated is that this material on its application is distributed with its coarser parts nearest to the previous layer in the board and with the finest parts of the material at the surface so that the last-mentioned parts are ground off on grinding the board after pressing and hence will be lost. In this way also a great part of the binder which is used for the surface layer will be lost, because the finer the particle material the more binder is absorbed by said material on application of the binder thereto. The presence of coarser particles at the surface of the board gives rise to irregularities on the influence of moisture or solvents owing to the fact that the greater particles will rise more than the finer particles as a result of said influence. This phenomenon appears for instance in the case of thin surface finishings such as when gluing a thin film to the board or when applying lacquer to the board.
  • An object of the present invention is to provide a method of the above mentioned type, by means of which method a surface of throughout fine material can be obtained.
  • Another object of the invention is to provide a method of the above mentioned type, by means of which method the consumption of binder for the surface layer can be cut down and the loss of binder by material ground away can be reduced.
  • These objects are achieved in accordance with the invention by means of a method which is characterized in that the material for the surface layer is fractionated and applied with the finest part of the material of the surface layer next to the previous layer which in the board is placed further in and with the coarsest part of the material of the surface layer at the surface of the board and in that the surface layer on grinding after pressing is ground down to the desired fineness of the material at the surface of the board.
  • The solution of the problem in accordance with the present invention thus implies a break with the conventional thinking according to which either non-fractionated particle material or fractionated particle.material has been applied which latter material without exception has been applied with increasing fineness out towards the surface of the board.
  • In comparison with such prior art methods which are using non-fractionated material for the surface layer, the method according to the invention provides a board with considerably higher volumetric weight and bending strength at the same percentage addition of binder and a considerably lower percentage addition of binder can be used for the attainment of the same bending strength.
  • The fractionation of the material for the surface layer in the method according to the invention is preferably carried out by methods known per se in connection with the stepless fractionation of particle material but the application of the fractionated material is carried out in reverse order in comparison with the conventional methods for the application of fractionated material, i.e. according to the invention the direction of the blowing in wind sifters is changed to be the reversed respectively the direction of rotation is changed in case of throwing rolls to be the reversed in comparison with the conventional methods. However, also a fractionation step-by-step of the material for the surface layer into two or more fractions can be used, if desired.
    • EXAMPLE
  • Glue-coated particles for the middle and surface layers of a three-layer board were taken from the production in the factory and were pressed to boards having a thickness of 15mm in a laboratory press at 2000C with a pressing time of 7 seconds/mm. The material of the surface layer amounted to about 35 % by weight calculated on the weight of the total particle material.
  • The material for the surface layer was fractionated according to the invention into 2 fractions, one being in the range of 0 - 5 mm and the other above 5 mm. The two fractions were strewed with the finer fraction next to the material of the middle layer and on both sides thereof and with the coarser fraction farthest.out on the two-sides of the boards. Two different percentages of glue (11.5 and 7.8 % by weight calculated on the weight of the surface layer) were used, three boards being pressed at each percentage of glue.
  • Two further boards were pressed in the same way but with a material for the surface layer to which there had been added 5 % by weight of non-glued wood dust calculated on the weight of the material for the .surface layers; the content of glue was 11.5 % by weight calculated on the weight of the material for the surface layers.
  • Three boards with non-fractionated material for the surface layers and with a content of 11.5 % by weight of glue calculated on the weight of the material for the surface layers were pressed as controls.
  • All boards were ground after the pressing.
  • Five samples were taken from each board and examined with respect to the volumetric weight and the bending strength. The results thus obtained are given in the Table below in the form of mean values obtained for the five samples.
    Figure imgb0001

Claims (1)

  1. Method for the preparation of a particle board by building up the board in layers with a middle layer of coarse material, a surface layer of fine material on each side of the board and, optionally, one or more intermediate layers between the middle layer and each surface layer, characterized in that the material for the surface layer is fractionated and applied with the finest part of the material of the surface layer next to the previous layer which in the board is placed further in and with the coarsest part of the material of the surface layer at the surface of the board and in that the surface layer on grinding after pressing is ground down to the desired fineness of the material at the surface of the board.
EP82850116A 1981-05-22 1982-05-19 Method for the preparation of particle board Withdrawn EP0065941A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8103255 1981-05-22
SE8103255A SE426371C (en) 1981-05-22 1981-05-22 WHEN PREPARING A CHEESE DISC

Publications (2)

Publication Number Publication Date
EP0065941A2 true EP0065941A2 (en) 1982-12-01
EP0065941A3 EP0065941A3 (en) 1984-08-15

Family

ID=20343911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82850116A Withdrawn EP0065941A3 (en) 1981-05-22 1982-05-19 Method for the preparation of particle board

Country Status (2)

Country Link
EP (1) EP0065941A3 (en)
SE (1) SE426371C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU580720B2 (en) * 1986-08-30 1989-01-27 Hornitex Werke Gebr.Kunnemeyer G.M.B.H. & Co. Kg Method of preparing wood-fibre boards
US6284794B1 (en) 1996-11-05 2001-09-04 Head Explorer Aps Method for treating tension-type headache with inhibitors of nitric oxide and nitric oxide synthase
WO2005046950A1 (en) * 2003-11-13 2005-05-26 Swedwood International Ab Particle board

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR926024A (en) * 1946-04-25 1947-09-19 Process for the manufacture of pressed plates formed from several layers of wood particles and binder and pressed plate obtained by means of this process
FR1318585A (en) * 1962-03-30 1963-02-15 August Moralt wood powder form elements
FR1486810A (en) * 1966-07-15 1967-06-30 Schenck Gmbh Carl Process and installation for manufacturing agglomerates, in particular panels or plates, from a web of dispersible material formed from several chouches
DE1528232A1 (en) * 1965-10-01 1970-07-02 Aicher Geb Particle board and process for its manufacture
DE1806210A1 (en) * 1968-10-31 1970-07-02 Emsland Spanplatten Kg Hans St Process and system for the preparation of wood-based material for the production of chipboard with at least one-sided fine material top layer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR926024A (en) * 1946-04-25 1947-09-19 Process for the manufacture of pressed plates formed from several layers of wood particles and binder and pressed plate obtained by means of this process
FR1318585A (en) * 1962-03-30 1963-02-15 August Moralt wood powder form elements
DE1528232A1 (en) * 1965-10-01 1970-07-02 Aicher Geb Particle board and process for its manufacture
FR1486810A (en) * 1966-07-15 1967-06-30 Schenck Gmbh Carl Process and installation for manufacturing agglomerates, in particular panels or plates, from a web of dispersible material formed from several chouches
DE1806210A1 (en) * 1968-10-31 1970-07-02 Emsland Spanplatten Kg Hans St Process and system for the preparation of wood-based material for the production of chipboard with at least one-sided fine material top layer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU580720B2 (en) * 1986-08-30 1989-01-27 Hornitex Werke Gebr.Kunnemeyer G.M.B.H. & Co. Kg Method of preparing wood-fibre boards
US4883546A (en) * 1986-08-30 1989-11-28 Otto Kunnemeyer Process for the manufacture of wood fiber boards
US6284794B1 (en) 1996-11-05 2001-09-04 Head Explorer Aps Method for treating tension-type headache with inhibitors of nitric oxide and nitric oxide synthase
WO2005046950A1 (en) * 2003-11-13 2005-05-26 Swedwood International Ab Particle board
US8398905B2 (en) 2003-11-13 2013-03-19 Swedwood International Ab Particle board
NO339429B1 (en) * 2003-11-13 2016-12-12 Ikea Supply Ag Particleboard and method of making it

Also Published As

Publication number Publication date
SE426371C (en) 1984-09-19
SE426371B (en) 1983-01-17
SE8103255L (en) 1982-11-23
EP0065941A3 (en) 1984-08-15

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Inventor name: JOHANSSON, LARS-OLOF