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WO1992004169A1 - Procede de collage par voie seche pour la fabrication d'elements a base de fibres - Google Patents

Procede de collage par voie seche pour la fabrication d'elements a base de fibres Download PDF

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Publication number
WO1992004169A1
WO1992004169A1 PCT/SE1991/000570 SE9100570W WO9204169A1 WO 1992004169 A1 WO1992004169 A1 WO 1992004169A1 SE 9100570 W SE9100570 W SE 9100570W WO 9204169 A1 WO9204169 A1 WO 9204169A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
fibres
powder
glue
fibre
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.)
Ceased
Application number
PCT/SE1991/000570
Other languages
English (en)
Inventor
Sven Ljungbo
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1992004169A1 publication Critical patent/WO1992004169A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • 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
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0209—Methods, e.g. characterised by the composition of the agent

Definitions

  • fibres of different types - especially wood fibres - are dispersed in an airstream. This one goes to a forming station or a moulder, where the air is exhausted by suction so that the fibres are packed together in a cake or a slab. This one is then pressed in a hot moulding press at the same time being dried and possibly cured to a body of required form and density.
  • glue materials dispersed or dissolved in water, are added.
  • the glue addition is made by injection of the glue into the steam-fiber-stream from the defibrator, producing the wood fibres. Then the fibres are dried strictly observing that the added glue must not be cured if it is a curable one. Then the fibres are dispersed in an air-stream which is blown into a diffuser, giving the air-fibre stream the right width and height, before it streams into the moulder.
  • the glue injection is made directly into the diffuser with or without previous drying of the fibres from the defibrator.
  • the glue powder can be water soluble and then forms a glue solution with water, which either goes with the fibres from the beginning of the process or is added though injection during the process. At the final drying the size powder transcends to a firm bond, joining the fibres. If a specially waterresistant fibre product is required also a hardener for the glue substance can be added. This hardener is added either in powder form separately or mixed with the size powder or as a solution in the water, added during the process. Alkali silicates have proved suitable as size powder. Compared to the abovementioned thermosets or curable glues they have the advantage of not emitting any harmful fumes and also of incresing the fire resistance of the fibrebodies.
  • the constitution of the alkali silicates or the ratio, L e. the mole ratio between silicon dioxide and alkali oxide can for sodium or potassium silicates suitably lie between 1,2 and 4,7 but also other ratios give usuable alkali silicate powders.
  • a silicate powder suitable for that purpose, is spray-dried water glass.
  • the latter is produced through spraying waterglass so it forms an aerosol, quickly being dried to powder in the hot air.
  • Such a powder of sedium waterglass with ratio 3,3 contains such a high percentage of bound water, that it is quickly dissolved by furhter added water already at a temperature of about 100 oC.
  • a condition precedent for the powder-glueing method is that the glue powder is evenly distributed over the fibres at the admixture and is then not separated from those during the airtransport to the moulder. This condition is met by adding a ' suitable amount of water - 10 to 100 % of the dry weight of the fibres - moistening the fibres to make the powder adhere.
  • This admixture can be made by simple, mechanical stirring.
  • a hardener transcending the alkali silicate to waterinsoluble silicates, can be added.
  • Firchips are defibrated in a disk defibrator.
  • the warm fibres are separated from the steam in a cyclone, from which they, by transport screw and conveyor belt, are taken to a cutter, which disperses them in an airstream, leading into a diffusor.
  • spraydried sodium silicate powder with ratio 3,3 is blown into the fibre-air-stream and is mixed with the fibers, ratio of components being 10 - 25 parts silicate powder to 100 parts dry fibre.
  • the moisture content of the fibre is 30 % at the injection into the diffusor.
  • the fibre - powder - air stream goes from the diffusor into the moulder, forming a cake, which then is transmitted to a hot moulding press, where it is given its final form and is glued/dried to a firm disk
  • Wood fibres from a defibrator are blown down into a mixer, where they are mixed with sodium silicate powder of the same type as in example 1 and with magnesium oxide, ratio of components being 8 parts silicate powder and 16 parts magnesium oxide powder to 100 parts dry fibre.
  • the moisture content of the fibre is 35 % at the injection into the diffusor.
  • the mixiuie is transmitted by conveyor to an ejector, which disperses it in air and injects it into a diffusor of a moulding machine, in which it is the formed, hot moulded hardened and dried to required fiberbody.
  • the cake can also be dried and hardened in heat without being compressed Thus it gets appropriate density in order to be used as insulating material.
  • magnesium oxide - silicate powder mixture a compounding of 10 parts silicate powder and 9 parts zink oxide to 100 parts dry fibre with the same moisture content as the above mentioned can be used
  • fibres than wood fibres just produced can be used to manufacture products according to the invention.
  • suitable fibres are paper - and paperreturn fibres, cotton- , flax- and hempfibres, syntetic polymer fibres, mineral fibres and others.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

L'invention se rapporte à un procédé de collage par voie sèche pour la fabrication d'éléments à base de fibres tels que disques, profilés, panneaux, tapis isolants, matériau d'emballage, etc. Ce procédé est basé sur le fait que la colle est composée de poudre de verre soluble, qui est mélangée avec les fibres, lesquelles ont été un peu humidifiées avant ou pendant le mélange, et soufflée dans un moule avec les fibres pour être estampée à chaud et former l'élément à base de fibres. Pendant le procédé, la poudre de colle est dissoute dans l'eau, transformée en forme plastique ou liquide pour agglomérer les fibres et est ensuite séchée et durcie pour former une composition solide pendant l'estampage. Pour rendre le procédé plus efficace, la poudre de silicate devrait contenir de l'eau, liée sous forme de liquide gélifié ou d'eau de cristallisation dans le silicate alcalin. On peut ainsi utiliser du verre soluble séché par pulvérisation comme poudre de colle. Afin d'améliorer l'imperméabilité des éléments à base de fibres, on peut ajouter un durcisseur, transformant le silicate alcalin en silicates insolubles dans l'eau. Les durcisseurs appropriés sont l'oxyde de magnésium, l'oxyde de zinc ou le blanc de titane.
PCT/SE1991/000570 1990-08-31 1991-08-30 Procede de collage par voie seche pour la fabrication d'elements a base de fibres Ceased WO1992004169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002781A SE467244B (sv) 1990-08-31 1990-08-31 Limningsmetod vid framstaellning av fiberkroppar enligt den torra metoden
SE9002781-4 1990-08-31

Publications (1)

Publication Number Publication Date
WO1992004169A1 true WO1992004169A1 (fr) 1992-03-19

Family

ID=20380246

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000570 Ceased WO1992004169A1 (fr) 1990-08-31 1991-08-30 Procede de collage par voie seche pour la fabrication d'elements a base de fibres

Country Status (3)

Country Link
AU (1) AU8534991A (fr)
SE (1) SE467244B (fr)
WO (1) WO1992004169A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996033057A1 (fr) * 1995-04-21 1996-10-24 Kühne, Michael Procede de production de corps moules
WO2003104160A1 (fr) * 2002-06-05 2003-12-18 Van Baerle & Cie Ag Materiau contenant une matiere cellulosique et du silicate
WO2004024824A1 (fr) * 2002-09-06 2004-03-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de fabrication de pieces usinees en fibres de bois ignifugees

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302841A1 (de) * 1983-01-28 1984-08-09 Hans W. 7850 Lörrach Geisert Schwerentflammbare platte o.dgl. und herstellungsverfahren dafuer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302841A1 (de) * 1983-01-28 1984-08-09 Hans W. 7850 Lörrach Geisert Schwerentflammbare platte o.dgl. und herstellungsverfahren dafuer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996033057A1 (fr) * 1995-04-21 1996-10-24 Kühne, Michael Procede de production de corps moules
US6007765A (en) * 1995-04-21 1999-12-28 Exori-Import-Export Gmbh & Co. Kg Method of producing molded articles
WO2003104160A1 (fr) * 2002-06-05 2003-12-18 Van Baerle & Cie Ag Materiau contenant une matiere cellulosique et du silicate
CH695855A5 (de) * 2002-06-05 2006-09-29 Baerle & Cie Ag Werkstoff umfassend cellulosisches Material und Silikat.
WO2004024824A1 (fr) * 2002-09-06 2004-03-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de fabrication de pieces usinees en fibres de bois ignifugees
US7858005B2 (en) * 2002-09-06 2010-12-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Method for the production of fire-resistant wood fiber moldings

Also Published As

Publication number Publication date
SE467244B (sv) 1992-06-22
SE9002781D0 (sv) 1990-08-31
SE9002781L (sv) 1992-03-01
AU8534991A (en) 1992-03-30

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