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

• This invention relates to a method of making fibre mats to be used as carcasse in laminate by impregnation and forming of fibre material.
• the laminate in question consists of a carcasse and surface layers and may have technical as well as decorative function.
• the carcasse in the laminate is assembled of a number of sheets of kraft paper, which have been impregnated preferably with phenol resin. At laminates of great thickness which are used as load-carrying structures, the number of paper sheets comprised therein is great.
• the present invention renders it possible that the manufacture of laminate can be carried out in a simpler and less expensive way.
• the carcasse or carrying structure in the laminate can be made in the form of a fibre mat direcly from the fibre material, so that no paper sheets are required.
• the fibre material can be of various kinds, for example cellulose fibres or artificial fibres, but preferably fibres of cellulose-containing material are used.
• the starting material are wood chips. They are washed in a chip washer 1 and thereafter fed into a refiner 2 via a preheater 3.
• the refiner 2 is of the type disc-refiner with a pressurized refiner housing 4.
• the object is to manufacture a fibre pulp which is substantially free of shives.
• Impregnation chemicals are added in the blow conduit 5 and/or immediately prior to the refining.
• the chemicals include a suitable binder such as phenol resin in an amount of 10-50, preferably 20-50% by weig of the fibre amount. A small amount of paraffin, up to
• the impregnation chemicals preferably are supplied in the blow conduit 5 where high speed and turbulence prevail in the fibre pulp, whereby the resin is effectively distributed on the single fibres.
• the impregnated fibre material is transferred from the blow conduit 5 to a drier 6, which comprises a fan 7 and a heating device 8 for heating air to a temperature below the curing temperature of the phenol resin (at maximum 200°C, preferably below 160°C).
• the hot air and the fibre pulp are transported through a drier pipe 9, in which the drying takes place.
• the staying time in the drier pipe 9 is very short. By controlling the air temperature and staying time, the desired dry content of the fibre material can be obtained.
• the solvent supplied with the impregnation medium and also the fibre moisture evaporate.
• the drier pipe 9 opens into a cyclone 10 where air and fibres are separated.
• Air outgoing from the cyclone normally has a temperarure between 60 and 85oC. Depending on the impregnation chemicals used, this air also can cont ain substances which must not be emitted freely.
• gases are released at the drying which in certain cases must be recovered. Part of the air can then be recirculated to the inlet of the drier fan 7, and the remaining part is directed to combustion.
• a temperature of 600oC is required. Suitable equipment for this purpose is commercially available.
• the fibre material separated in the cyclone 10 is weighed on a pair of fibre scales 11, preferably of the type belt weigher.
• the fibre amount weighed determine the supply of impregnation agent.
• the fibre material is transported from there in an air transport conduit to a storage container 12, into which the fibre material is fed via an air separation cyclone 13. From said container 12 the fibre material is passed by means of an air transport conduit to a forming station 14, for example of the type shown in SE-PS 7510795-3.
• the forming station can be a pneumatic or mechanical one and adjustable to different thicknesses.
• the forming station 14 comprises a distribution chamber 15 and a conveyor belt 16 in the form of a wire, on which the fibres are deposited.
• the transport air is sucked through the belt by means of a fan 17.
• An additional cyclone 18 and fans are provided for separating and returning fibres following along, which fibres are subjected to repeated distribution in the forming station 14. This arrangement implies that the mat formed can meet reasonable requirements on forming accuracy (surface layer variations).
• the forming is followed by a continuous prepressing in a press 19, preferably a belt prepress of conventional design for removing remaining air from the fibre mat and for consolidating the mat so that it can be handled in subsequent process steps.
• Loose fibres are also returned from the prepressing to be used again in the forming station.
• the fibre mat is thereafter divided into desired dimensions by means of longitudinal and transverse saws 20 and, respectively, 21.
• a metal detector 22 preferably can be located in connection to the saws.
• a plate prepress may also be provided before the laminate press. In said prepress heat may possibly be supplied to the fibre mat in order to shorten the heating time in the subsequent laminate press.
• Fibre mats which are rejected, for example because of nonuniform forming at the start, are passed to a return bin 22 where the material is torn and returned to the process.
• the fibre material is passed to a special reject container for treatment.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Paper (AREA)
• Laminated Bodies (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)
• Multicomponent Fibers (AREA)
• Nonwoven Fabrics (AREA)
• Reinforced Plastic Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20355758

Family Applications (1)

Country Status (11)

Cited By (1)

Citations (5)

• 1984
  • 1984-05-04 SE SE8402418A patent/SE446996B/sv not_active IP Right Cessation
• 1985
  • 1985-03-21 NZ NZ211528A patent/NZ211528A/en unknown
  • 1985-04-01 BR BR8507181A patent/BR8507181A/pt unknown
  • 1985-04-01 AU AU42192/85A patent/AU579629B2/en not_active Ceased
  • 1985-04-01 JP JP60501765A patent/JPS61502046A/ja active Pending
  • 1985-04-01 WO PCT/SE1985/000153 patent/WO1985005065A1/en not_active Application Discontinuation
  • 1985-04-01 EP EP85902177A patent/EP0211842A1/en not_active Withdrawn
  • 1985-04-18 CA CA000479423A patent/CA1278470C/en not_active Expired - Fee Related
  • 1985-12-09 DK DK568085A patent/DK158237C/da not_active IP Right Cessation
• 1986
  • 1986-01-03 NO NO860014A patent/NO860014L/no unknown
  • 1986-11-03 FI FI864465A patent/FI864465A/fi not_active Application Discontinuation

Patent Citations (5)

Non-Patent Citations (1)

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