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
  • B27N3/146—Controlling mat weight distribution

Definitions

• the invention relates to a device for producing a
• MDF boards consisting of medium-density fibers, or OSB boards of oriented, scattered chips. Scattering occurs in one or more layers as needed, with the need for multiple layers usually occurring in the production of thicker plates. But also in the production of thin plates, different layers may be desired, especially if specially differentiated requirements exist between the
• Middle layer and the outer layers should exist.
• Production of thin MDF sheets of thickness 3 mm is in the range of +/- 3.5%.
• the production of 8 mm thick floor panels results in a deviation of the basis weight distribution across the panel width of +/- 2.5%.
• the result improves to +/- 2.0%.
• the buyer of the material plates produced receives material of high density, which may later cause problems in logistics or sales.
• Basis weight profile and for determining manipulated variables is arranged on at least one adjustment device within the scattering device and that the measuring device and at least one adjusting device are arranged within a distance relative to the length of the pressed material mat of less than 5 m.
• a separate device is provided for measuring the basis weight for correcting the scattering, which must both be arranged between the spreading head and the press. The correction of the scattering should already take place within the scattering head or very close to the scattering head. From DE 10 201 1 016 343 B4 a method for adjusting the basis weight of a scattered on a conveyor bulk material mat is also known, wherein the weight per unit area of the bulk mat in turn is measured by a separate device in front of a removal roller.
• the invention is therefore based on the object to provide a compact device for improving the quality of the pressed product mat and a plant for the production of material plates.
• a device for producing a sprinkled on conveyor belt Pressgutmatte consisting of chips, fibers and / or
• the removal roller is designed to be height adjustable.
• a preferred embodiment is that a
• Correction module between the removal roller and the conveyor belt for compensation is arranged by partial density variations, wherein the correction module can be performed in sections adjustable.
• the radiation source of the basis weight scale should preferably consist of an X-ray emitter or gamma emitter.
• the shield consists of metal and / or concrete or another material for shielding radiation.
• the basis weight scale for measuring a screened grammage profile should also be arranged with a resolution of 100 mm ⁇ 100 mm and, if appropriate, correlating the removal roller and the
• Correction module provide appropriate adjustment options.
• a preferred solution is that a compression roller for pre-compression is arranged in front of the removal roller, wherein the
• Compression roller can also be made adjustable in sections.
• a control unit for comparing the actual value with the target value of the basis weight and for determining manipulated variables for the removal roller, the correction module and / or the compaction roller should be arranged.
• a further solution of the problem consists in a plant for the production of material panels from biomass, comprising
• ⁇ a basis weight scale, consisting of a radiation source and a sensor
• the advantages of the device according to the invention are considerable: By using parts of the shielding of the basis weight scale, a more compact design can take place, whereby less space in a press is required for the device. By integrating the removal roller in the arrangement of the basis weight scale, the control distance between the discharge roller and basis weight scale is also significantly reduced, so that a more direct control can be done. With this, errors in the scattering can be corrected more quickly, whereby less misregulated press material mat is produced and the rejects are thus minimized.
• Fig. 1 schematically illustrates the prior art for
• Fig. 2 shows schematically a device according to the present invention.
• FIG. 1 schematically illustrates the prior art.
• the press material mat 13 scattered on a conveyor belt 2 first arrives in the direction of production 12 at a removal roller, by means of which it spreads too much
• the flat weight scale 14 attached as a separate device.
• the flat weight scale 14 consists of a radiation source 7, the measuring beam 8 is detected by the pressed material mat 13 on a sensor 9 for determining the basis weight of the pressed material mat 13. Due to the radiation source 7, the basis weight balance 14 must be embedded in a shield 10. Be of the basis weight balance 14 a
• FIG. 2 shows the device 1 according to the invention, in which now the
• Abtragwalze 4 has become an integral part of the basis weight balance 14.
• a pre-compaction of the pressed material mat 13 by means of a roller 5 can first take place in the production direction 12. Furthermore, in the production direction 12, a removal of the press material mat 13, which has been scattered on a conveyor belt 2, takes place by means of a removal roller 4, which again

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50771247

Family Applications (1)

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Citations (5)

Family Cites Families (3)

• 2013
  • 2013-05-06 DE DE102013104651.7A patent/DE102013104651A1/de not_active Withdrawn
• 2014
  • 2014-05-06 WO PCT/EP2014/059269 patent/WO2014180866A1/de active Application Filing
  • 2014-05-06 CN CN201480025909.0A patent/CN105209228B/zh not_active Expired - Fee Related
  • 2014-05-06 EP EP14725390.0A patent/EP2994280B1/de not_active Not-in-force

Patent Citations (5)

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