EP0697941B1 - Procede de recuperation de copeaux et de fibres par desagregation de residus de materiaux derives du bois, de vieux meubles, de residus de production, de dechets et d'autres materiaux contenant des materiaux derives du bois - Google Patents

Procede de recuperation de copeaux et de fibres par desagregation de residus de materiaux derives du bois, de vieux meubles, de residus de production, de dechets et d'autres materiaux contenant des materiaux derives du bois Download PDF

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Publication number
EP0697941B1
EP0697941B1 EP95913030A EP95913030A EP0697941B1 EP 0697941 B1 EP0697941 B1 EP 0697941B1 EP 95913030 A EP95913030 A EP 95913030A EP 95913030 A EP95913030 A EP 95913030A EP 0697941 B1 EP0697941 B1 EP 0697941B1
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EP
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Prior art keywords
process according
wood
impregnation
impregnating solution
digestion
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German (de)
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EP0697941A1 (fr
EP0697941B2 (fr
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Andreas Michanickl
Christian Boehme
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • 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
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • 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
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled 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
    • B27N1/00—Pretreatment of moulding material

Definitions

  • the invention relates to a method for the recovery of chips and fibers from wood materials and wood material containing materials glued with urea-formaldehyde binders or with other hydrolyzable or chemically digestible binders according to the preamble of the main claim.
  • Another method is e.g. B. boiling in an excess of water and the associated dissolution of urea-formaldehyde resin-bonded chipboard and medium-density MDF.
  • This process is energy and cost intensive.
  • the energy consumption is v. a. greatly increased by boiling the excess water.
  • the chips are boiled out and thereby change their properties unfavorably.
  • the swellability increases due to the removal of wood components, while the technological properties of the chips deteriorate.
  • the binder is removed from the chips and can no longer have a positive effect on re-gluing. The resulting wastewater problem and the drying effort of the chips or fibers are considerable.
  • DE 42 01 201 A1 discloses a process for recycling wood-based materials and waste. This process is used to produce new, finished semi-finished or finished products from wood-based material remnants after appropriate mechanical processing.
  • the object of the present invention is to provide a method for the recovery of chips and fibers from wood material pieces, which is environmentally friendly and economically feasible.
  • this process is intended to recover high-quality chip and fiber material (secondary chips or secondary fibers).
  • This object is achieved by the method specified in claim 1.
  • the subclaims represent advantageous developments.
  • wood material pieces are impregnated with an impregnating or soaking solution and pre-swollen until they have absorbed at least 50% of their own weight in impregnating solution.
  • the impregnated wood material pieces are heated to 80 ° C heated to 120 ° C until the bond of chips and fibers is dissolved by the influence of the impregnation solution and the temperature, ie the glue compounds are destroyed chemically by hydrolysis and mechanically by swelling.
  • the amount of impregnation solution and the impregnation process taken up by the wood material pieces are dimensioned or adjusted so that, on the one hand, a complete solution of the wood materials takes place in the specified temperature range, but on the other hand, after the digestion, there is no longer any free catchable liquid, so that there is no solution to be disposed of .
  • the method according to the invention is a combination of chemical, thermal and mechanical process steps. These make it possible to digest the wood-based material pieces with comparatively mild digestion parameters, thereby recovering chips and fibers in undamaged or even tempered form. This procedure is possible through the use of the impregnation solution with which the material is impregnated or soaked without any cooking liquor or waste water remaining after the digestion.
  • the impregnation solution enables complete hydrolysis even at temperatures from 80 ° C, preferably in the range 80-120 ° C. Because the temperatures are in a low range, the geometrical chip and fiber quality present in the wood materials is retained. The chemical-physical properties also remain the same or are improved by the digestion.
  • the secondary chips and secondary fibers can be produced with little financial and technical effort and can be made with and without the addition of fresh chips or fresh fibers on conventional production lines to new wood-based materials such as. B. chipboard and fiberboard.
  • the wood materials produced in this way have comparable or even better properties than wood materials made from fresh material. This applies to both the technological properties and the formaldehyde emission.
  • the secondary chips and fibers can be processed with conventional binders. Binder consumption is not increased. It can even be reduced by the process.
  • the process is carried out in such a way that impregnating solution is added to the wood material pieces, in such an amount that after the wood material pieces have completely absorbed the solution, the latter have absorbed at least 50% of their own weight in impregnation solution.
  • impregnating solution is added to the wood material pieces, in such an amount that after the wood material pieces have completely absorbed the solution, the latter have absorbed at least 50% of their own weight in impregnation solution.
  • the treated wood material pieces ie soaked with impregnation solution
  • the wood-based material pieces are heated to a temperature in the range between 80 and 120 ° C.
  • the hydrolysis of the glue compounds takes place under the influence of temperature and the action of the impregnation solution.
  • a variant of the method provides that the impregnation process already takes place in the digestion tank and that the temperature is applied after the liquid material has been completely absorbed by the wood material pieces or after the excess impregnation solution has been drained off.
  • the temperature can be applied either under pressure (in the pressure-tightly closed digestion tank) or without pressure. The pressure level depends on the set temperature.
  • the duration of the digestion is approximately 1 to 60 minutes. For example, higher temperatures, a higher proportion of impregnation solution and a high acid content of the impregnation solution accelerate the digestion, while it is slowed down by lower temperatures, a lower proportion of impregnation solution and a basic setting of the impregnation solution.
  • the amount of pressure used during the heating begins at normal pressure and should be with a view to the most gentle digestion expediently do not go over two bar overpressure.
  • the temperature should also not be above 120 ° C with a view to digestion which is as gentle as possible and nevertheless rapid.
  • the impregnation process is to be accelerated, it is advantageous if it takes place under negative pressure (after evacuating the impregnating container) or at an overpressure above normal pressure.
  • Vacuum treatment applying a vacuum of e.g. 150 mbar (absolute) to the impregnation tank) of the wood-based materials allows the air contained therein to escape. At normal pressure, this impedes the penetration of the impregnation solution and would make it impossible to open up flat, coated wood-based materials without negative pressure.
  • the cavities filled with air make up approximately 30 to 70% of the volume of wood-based materials. Overpressure also facilitates quick penetration of the impregnation solution into the wood-based material.
  • the impregnation process takes place with a combination of negative and positive pressure, it is accelerated compared to the course at normal pressure. Heating the impregnation solution or the wood-based material during or before the impregnation has the same effect.
  • the impregnation solution can be heated in an energy-saving manner by the heat generated when the digestion container is degassed, or when it is discharged from the digestion container or when the digestion material is sorted. Likewise, the digestion material can be heated by the heat generated during the exhaust or discharge from the digestion tank.
  • Another process sequence provides that the wood material residues are filled together with the impregnation solution into a rotating digestion tank or equipped with a mixer or stirrer (the amount of the impregnation solution added being dimensioned such that after impregnation and digestion there is no free, drainable one Impregnation solution or waste liquor is more to be disposed of) and the digestion tank is heated to a temperature between 80 and 120 ° C.
  • the mechanical process of destroying the glue connections by swelling and the chemical decomposition by hydrolysis take place simultaneously. Ie the wood material pieces are simultaneously exposed to the influence of the impregnation solution and the temperature (and pressure).
  • digestion can be carried out at low temperatures, both under pressure and without pressure. This protects the chips and fibers, the binder components present in the waste materials, e.g. B. urea, are not or only slightly damaged and can thus have a positive effect on re-gluing or even reactivated (reduction of the need for binders and the formaldehyde emission). At the same time, disturbing emissions, such as those that occur at higher temperatures and pressures, are avoided.
  • the wood-based composite After the digestion, the wood-based composite is completely dissolved.
  • the chips and fibers as well as the coatings, solid wood parts, edging materials, metals and other non-chip and fiber components are separated from each other and can be sorted by sieving, wind sifting, a combination of both or a new separation process, in particular the chip and easily separate the fiber fraction, since the chips or fibers are much smaller than, for example, the coatings, which are still the size of the pre-broken wood materials.
  • the chips and fibers After digestion, the chips and fibers have a moisture content that corresponds to or even less than that of fresh forest wood.
  • the increased temperature of the chips after digestion has an advantageous effect on their drying.
  • the recovered chip material can be separated in the usual way or also dried with fresh chips or fibers. Particles and fiberboard can be produced from the recovered chips and fibers without the addition of fresh chips or fibers with unmodified commercially available binders, which have the same or even better properties than the starting material. This applies to both the technological properties and the formaldehyde emission.
  • An absorption of 80% of the weight of the wood-based materials in impregnation solution is particularly favorable for a particularly fast and complete digestion.
  • the impregnation solution can be absorbed at normal temperature (Ambient temperature) and normal pressure.
  • the absorption can be accelerated, for example, by a vacuum treatment preceding the impregnation and / or a pressure swing treatment and / or an increase in temperature of the impregnation solution and / or heating of the digestion material.
  • the size of the wood materials to be broken down is advantageously in the range of an average edge length of at least 10 to 20 cm, which is achieved by a slowly rotating, commercially available primary crusher. This size helps to ensure that the chips and fibers are only slightly damaged. Only a few chips and fibers are damaged in the edge area as the material breaks here mainly in the glue joint due to the special, slowly rotating roller of the primary crusher. In addition, the coatings and other non-chip and fiber components are only slightly changed in size, so that they can be easily separated after digestion, since they are then much larger than the chips or fibers.
  • the use of the impregnation solution opens up numerous possibilities for controlling the digestion and especially the digestion result.
  • the chips and fibers can even be coated with the composition of the impregnation solution, ie they can have better chemical and physical properties than fresh chips due to the impregnation and / or the digestion.
  • chipboard and medium-density fibreboard from old furniture in particular have relatively high formaldehyde emissions and contents, it makes sense to add urea, ammonia or urea or ammonia-releasing or other formaldehyde-binding, formaldehyde-inhibiting or formaldehyde-destroying chemicals to the impregnation solution.
  • the formaldehyde concentration released in the waste air and drying air after digestion is reduced or avoided entirely.
  • alkalis e.g. B. the formation of acids can be counteracted.
  • Acids contained in the wood can be neutralized.
  • the chips can e.g. B. can be set slightly basic.
  • the hardening of added binders can be delayed, which is of particular interest if there is a longer period between gluing and pressing.
  • the spectrum of coatings for the wood-based materials made from secondary chips or fibers can also be extended to materials that require a basic substrate.
  • the acid content of the recovered chips and fibers can be increased by adding acids. In this way, the addition of hardeners to the binder in wood-based panel manufacture can be dispensed with in whole or in part, or the curing of the binder can simply be accelerated.
  • the addition of acids also has an advantageous effect if the chips or fibers thus recovered are used to produce materials to which coatings are applied which have an acid-curing adhesive system.
  • the adhesive system could be simplified and the application of the coating would also be accelerated.
  • the digestion process is also accelerated by adding acid to the impregnation solution.
  • the addition of oxidizing or reducing agents is also advantageous. This can on the one hand destroy formaldehyde released, on the other hand z. B. by the addition of peroxides urea can be reactivated to a certain extent.
  • Another advantageous embodiment with regard to the composition of the impregnation solution is also the addition of binders such as. B. urea-formaldehyde resins or binder additives such. B.
  • paraffins for impregnation solution This has a positive effect on the reduction in formaldehyde or on the subsequent swelling and water absorption of the secondary chips and fibers, and further gluing of the recovered chips and fibers after digestion can be dispensed with in whole or in part.
  • the chips and fibers do not need to be dried as much for further processing into plates. If the recovered shavings are to be processed into fibers for the manufacture of fiberboard, the addition of lignin-softening chemicals such as methanol, sulfites or ammonia is advisable in order to save energy in the later fiber production.
  • a standard impregnation solution will contain approx. 0.5 to 3% urea, and approx. 0.1 to 1% ammonia or approx. 0.5% sodium hydroxide solution (dissolved in water). Due to the chemicals contained in the impregnation solution, no wood digestion (delignification) is brought about as in the production of cellulose.
  • the digestion is carried out with a controlled temperature profile. This can be such that the temperature is brought to a higher temperature level at the beginning of the digestion and a falling temperature is present towards the end of the digestion. A different, non-constant temperature profile is also possible.
  • Old furniture, production remnants and scrap which contain chipboard and / or MDF or other wood-based materials, are broken into pieces with an edge length of 10 to 20 cm using a commercially available pre-crusher (e.g. pre-crusher from Pallmann or Maier).
  • pre-crusher e.g. pre-crusher from Pallmann or Maier
  • the chips and fibers as well as the coatings and edge materials are only mechanically damaged to a small extent.
  • Metal, plastic and solid wood parts do not have to be separated.
  • Chipboard and MDF or other wood materials can be broken down separately or mixed.
  • the pre-broken wood material parts are filled into a standing or rotating digestion / pressure vessel.
  • a bulk density of about 350 to 400 kg / m 3 is achieved .
  • the pressure vessel is closed and evacuated, so that a negative pressure of 150 to 200 mbar (absolutely) sets.
  • the length of time until this vacuum is set depends on the technology used.
  • the impregnation solution now added can penetrate the wood-based materials in a short time. This penetration time is about 5 to 15 minutes with chipboard and depends on the type of wood material, the negative pressure, the composition of the impregnation solution and its temperature.
  • the impregnation solution consists of water, urea and sodium hydroxide solution.
  • the wood material pieces are exposed to this solution until they have absorbed at least 50% of their own weight corresponding to a liquor ratio (ratio of wood materials to impregnation solution after the impregnation process has ended) of 1: 0.5.
  • a liquor ratio ratio of wood materials to impregnation solution after the impregnation process has ended
  • the digestion container is then closed again and heated to 110 ° C. for about 20 minutes. The heating takes place in a relatively short time due to the free spaces between the plate pieces. After this treatment, the chips or fibers are again in their original geometric shape.
  • the coatings and edge materials, as well as other undesirable components, have been removed and can be separated from the chip or fiber fraction by a subsequent screening or wind sifting or a combination of both.
  • the residue can be sorted further, e.g. B. in solid wood, plastic and metal parts. These can be processed further, used thermally to generate electricity or energy, or disposed of in some other way.
  • Metals can e.g. B. separated by magnets or metal detectors. Plastics and wooden parts are sorted and separated by NIR spectroscopic or other methods.
  • Example 1 the digestion material and impregnation solution are already filled in the desired liquor ratio into a rotating digestion tank or a digestion tank equipped with a stirrer or mixer. This means that a maximum of as much impregnation solution is added to the digestion tank as the digestion material can hold.
  • the impregnation solution is mixed and evenly taken up by rotating the digestion tank or the agitator or mixer.
  • the digestion vessel can from the beginning, d. H. immediately after sealing, be heated up.
  • the impregnation takes place in a different container than the digestion container and the finished impregnated wood material pieces are filled into the digestion container so that the temperature can be applied directly.
  • the impregnation solution is at a temperature higher than ambient, preferably 60 to 80 ° C.
  • the impregnating solution contains formaldehyde-binding, formaldehyde-inhibiting or formaldehyde-destroying chemicals, e.g. Urea ammonia or urea or ammonia-releasing substances are added.
  • impregnating solution bases such.
  • acids such as e.g. Sulfuric acid, oxidizing or reducing agents
  • binders such as e.g. Urea formaldehyde resins, binder-preserving or binder-reactivating substances, all chemicals are added in a total concentration up to 30%.
  • Fig. 1 a plant for the digestion of chipboard and wood material residues according to the invention is shown schematically.
  • the process sequence is shown schematically in FIG.
  • Wood material remnants are placed on a primary crusher 2 by a wheel loader 1 or a grab excavator or another suitable device.
  • the pre-crusher 2 breaks the wood materials into flat pieces with an edge length of on average 10 to 20 cm.
  • the pre-broken material is then conveyed into the digestion container 3 via a suitable conveying device 17.
  • the digestion container 3 also has the function of an impregnation container. After the digestion container 3 is filled, it is closed airtight. The air contained in the digestion tank 3 and the wood materials is sucked off via a vacuum pump 9 until a vacuum of about 150 to 200 mbar (absolute) has been reached.
  • the impregnation solution is now led from the preparation container 4 for impregnation solution via a line 15 into the digestion container 3 until the wood materials are completely covered by the latter.
  • Normal pressure is now set again in the digestion tank 3. Overpressure could also be applied to accelerate the penetration of the impregnation solution. Impregnation at normal pressure is also possible.
  • the preparation container 4 for the impregnation solution has an agitator 5 and a supply for chemicals 6 and a feed line for water 7. When the impregnation process is complete, ie the wood-based material pieces have at least 50% of theirs Own weight of impregnation solution added, the excess impregnation solution is drained from the digestion tank 3 back into the preparation tank 4 via a line 10.
  • the digestion container 3 is closed again in a pressure-tight manner and is now heated by means of a heat source 8 via the outer surface or by direct supply of heat by hot air, steam or another gaseous heat transfer medium. For example, a temperature of 110 ° C. is produced for 20 minutes in the digestion tank 3. The heat supply is then stopped and the digestion tank 3 is emptied by a discharge device 16. Instead of a discharge device, the digestion container could also be emptied through an opening in the lower region that extends over the entire width. The digested material is fed into a silo 11 or another suitable storage container. From there it is continuously fed to a screening machine 12.
  • Laboratory chipboard made of fresh 19 mm chips Yield [g / cm 3 ] 0.703 0.674 0.673 Modulus of elasticity [N / mm 2 ] 2410 2460 2600 Flexural strength [N / mm 2 ] 11.99 12.55 15.20 Transverse tensile strength [N / mm 2 ] 0.529 0.520 0.668 Lift resistance [N / mm 2 ] 1.10 1.17 1.27 Shear strength [N / mm 2 ] 1.71 1.48 1.70 Perforator values [mg / 100 g] 6.8 5.4 8.1 Humidity at 20/65 [%] 10.0 9.5 10.1 Old furniture chipboard (1964) without coating 19 mm

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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)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (25)

  1. Procédé de récupération de copeaux et de fibres de résidus de matériaux dérivés du bois, de vieux meubles, de résidus de production, de déchets et autres matériaux contenant du bois, collés par des liants urée-formaldéhyde ou d'autres liants hydrolysables ou liants chimiquement dissolubles, selon lequel on désagrège les pièces en bois à température élevée,
    caractérisé en ce que
    dans une première étape on imprègne les pièces à base de bois avec une solution d'imprégnation ou d'inhibition et on les fait gonfler jusqu'à ce qu'elles aient absorbé au moins 50 % de leur poids propre en solution d'imprégnation et dans une seconde étape on chauffe les pièces à base de bois imprégnées à une température comprise entre 80°C et 120°C et on trie par tamisage et/ou triage par le vent.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on imprègne dans une cuve d'imprégnation et on expose les pièces à base de bois imprégnées dans une autre cuve, à savoir la cuve de désagrégation avec action de la température.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    l'imprégnation et l'action de la température sont effectuées dans la cuve de désagrégation (3).
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    l'imprégnation se fait avant chauffage dans la cuve de désagrégation (3).
  5. Procédé selon la revendication 3,
    caractérisé en ce qu'
    on effectue simultanément l'imprégnation et l'action de la température.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les pièces à base de bois sont plates et ont une longueur d'arête d'au moins 10 à 20 cm.
  7. Procédé selon l'une des revendications 1 à 4 et 6,
    caractérisé en ce que
    l'imprégnation dure au moins une minute.
  8. Procédé selon l'une des revendications 1 à 6,
    caractérisé en ce que
    l'action de la température dure au moins une minute.
  9. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la quantité de la solution d'imprégnation ajoutée aux pièces à base de bois est telle que tout le liquide est absorbé par les pièces à base de bois.
  10. Procédé selon l'une des revendications 2 à 9,
    caractérisé en ce que
    la cuve d'imprégnation ou de désagrégation (3) est une cuve rotative ou est équipée d'un dispositif mélangeur ou agitateur (16) pour mélanger les pièces à base de bois et la solution d'imprégnation.
  11. Procédé selon l'une des revendications 1 à 8,
    caractérisé en ce qu'
    on ajoute une solution d'imprégnation aux pièces à base de bois pour que l'ensemble des pièces soit recouvert et après absorption du liquide, on évacue la solution d'imprégnation résiduelle.
  12. Procédé selon la revendication 11,
    caractérisé en ce qu'
    on effectue le procédé dans une cuve debout.
  13. Procédé selon l'une des revendications précédentes,
    caractérisé en ce qu'
    on fait régner, dans la cuve de désagrégation (3), une pression allant jusqu'à deux bars.
  14. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les pièces à base de bois ont une teneur en solution d'imprégnation de l'ordre de 80 % de leur poids propre et elles sont exposées pendant 20 minutes à une température de 110°C.
  15. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'action de la température se fait à la pression normale.
  16. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'imprégnation se fait avec une solution d'imprégnation à une pression inférieure à la pression normale ou après un traitement en dépression (mise sous vide) des pièces à base de bois
  17. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'imprégnation se fait avec une solution d'imprégnation à une pression supérieure à la pression normale.
  18. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    l'imprégnation se fait avec une solution d'imprégnation en combinant une pression et une dépression.
  19. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les pièces à base de bois sont chauffées avant d'être imprégnées.
  20. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la solution d'imprégnation est chauffée au cours et/ou avant l'opération d'imprégnation (de préférence à une température allant jusqu'à 80°C).
  21. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la solution d'imprégnation reçoit des produits chimiques se combinant avec la formaldéhyde, inhibant la formaldéhyde ou détruisant la formaldéhyde comme l'urée, l'ammoniaque ou des produits chimiques dégageant de l'urée ou de l'ammoniaque.
  22. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la solution d'imprégnation contient des lessives telles que des lessives de sodium, des acides tels que par exemple de l'acide sulfurique, des agents oxydants ou réducteurs, des liants tels que par exemple des résines urée-formaldéhyde, des agents de conservation de liants ou des substances activant les liants, tous ces produits chimiques étant ajoutés avec une concentration globale allant jusqu'à 30 %.
  23. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    pendant la désagrégation on ajoute les produits chimiques dans la cuve de désagrégation (3).
  24. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    pendant la désagrégation on utilise un profil de températures consistant par exemple à passer tout d'abord à des températures élevées puis à des températures basses.
  25. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les copeaux ou les fibres, récupérés après décomposition, sont traités à l'état encore humide, à l'état à peine séché ou à l'état sec, avec des produits chimiques selon les revendications 21 et/ou 22.
EP95913030A 1994-03-15 1995-03-14 Procede de recuperation de copeaux et de fibres par desagregation de residus de materiaux derives du bois, de vieux meubles, de residus de production, de dechets et d'autres materiaux contenant des materiaux derives du bois Expired - Lifetime EP0697941B2 (fr)

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DE4408788 1994-03-15
DE4408788 1994-03-15
PCT/DE1995/000360 WO1995024998A1 (fr) 1994-03-15 1995-03-14 Procede de recuperation de copeaux et de fibres par desagregation de residus de materiaux derives du bois, de vieux meubles, de residus de production, de dechets et d'autres materiaux contenant des materiaux derives du bois

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EP0697941A1 EP0697941A1 (fr) 1996-02-28
EP0697941B1 true EP0697941B1 (fr) 1997-08-27
EP0697941B2 EP0697941B2 (fr) 2002-07-17

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EP95913030A Expired - Lifetime EP0697941B2 (fr) 1994-03-15 1995-03-14 Procede de recuperation de copeaux et de fibres par desagregation de residus de materiaux derives du bois, de vieux meubles, de residus de production, de dechets et d'autres materiaux contenant des materiaux derives du bois

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US (1) US5804035A (fr)
EP (1) EP0697941B2 (fr)
JP (1) JP3609414B2 (fr)
KR (1) KR100353308B1 (fr)
AT (1) ATE157298T1 (fr)
CA (1) CA2162894C (fr)
DE (2) DE19509152A1 (fr)
DK (1) DK0697941T4 (fr)
ES (1) ES2107311T5 (fr)
GR (1) GR3025090T3 (fr)
WO (1) WO1995024998A1 (fr)

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DE19637909A1 (de) * 1996-09-18 1998-03-19 Infan Ingenieurgesellschaft Fu Verfahren zur Verwertung von Altholz
DE19640503C1 (de) * 1996-10-01 1998-05-20 Formaplan Holzwerkstoffe Gmbh Verfahren und Vorrichtung zur Gewinnung von Sekundärspänen und -fasern
DE19653067A1 (de) * 1996-11-25 1998-06-04 Nolte Gmbh & Co Kg Spanplatten Verfahren zur Wiedergewinnung und Weiterverarbeitung spanförmiger Holzwerkstoffe
GB9625068D0 (en) * 1996-12-02 1997-01-22 Marlit Ltd Method for production of lignocellulosic composite materials
DE19751326C2 (de) * 1997-11-19 2001-01-04 Pfleiderer Unternehmensverwalt Verfahren zur Herstellung von Holzwerkstoffen unter Verwertung von Gebraucht-, Rest- und Abfallholzwerkstoffen
EP1052021A1 (fr) 1999-05-06 2000-11-15 von Deym, Carl-Ludwig, Graf Procédé pour trier/séparer et installation de recyclage de matière plastique
GB9913074D0 (en) * 1999-06-04 1999-08-04 Adhesives Research Insitute Lt Method for extracting and recycling waste contaminated wood
DE19945466B4 (de) * 1999-09-22 2004-09-23 Pfleiderer Ag Vorrichtung und Verfahren zum Aufschluss von Holzwerkstoffen
GB9928554D0 (en) * 1999-12-02 2000-02-02 Enigma Nv Production of high added value products from wastes
AUPR245101A0 (en) * 2001-01-10 2001-02-01 Silverbrook Research Pty Ltd A method (WSM04)
DE10124717A1 (de) 2001-05-19 2002-11-21 Rolf Hesch Verfahren und Vorrichtung zur Zerlegung von Altstoffen in wiederverwendbare Bestandteile, insbesondere zum Recycling von Holzwerkstoffen, Altmöbeln, Kfz-Verbundwerkstoffen und ähnlichen Produkten
DE10144793A1 (de) * 2001-09-12 2003-03-27 Fraunhofer Ges Forschung Verfahren zur Wiedergewinnung von Spänen und Fasern aus Holzwerkstoffreststücken
DE10216954B4 (de) * 2002-04-17 2004-10-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Wiedergewinnung von Spänen und Fasern aus Holzwerkstoffreststücken und Anlage zur Weiterbehandlung der durch Aufschluss erzielten Späne
EP1649103A1 (fr) * 2003-07-16 2006-04-26 FIRA International Limited Recyclage de planches a base de lignocellulose
JP4592589B2 (ja) * 2003-09-26 2010-12-01 ヘキソン スペシャルティ ケミカルズ インコーポレーテッド 徐放性硬化系
US20110060077A1 (en) * 2009-09-10 2011-03-10 Yeng-Fong Shih Process for Manufacturing High-Performance Natural Fiber Reinforced Composites
PL3881994T3 (pl) * 2019-03-26 2022-11-28 Flooring Technologies Ltd. Nadający się do recyklingu produkt drewnopochodny, w szczególności nadający się do recyklingu laminat dekoracyjny na bazie materiału drewnopochodnego
IT201900014682A1 (it) 2019-08-12 2021-02-12 Fantoni Arredamenti Spa Pannello in fibra di legno e relativo impianto e metodo di realizzazione
EP4045202A1 (fr) * 2019-10-17 2022-08-24 Covestro (Netherlands) B.V. Procédé destiné à permettre le recyclage d'un panneau
RU2735099C1 (ru) * 2019-12-23 2020-10-28 федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технологический университет" (ФГБОУ ВО "КНИТУ") Способ утилизации железнодорожных древесных шпал
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Also Published As

Publication number Publication date
ES2107311T5 (es) 2003-02-16
EP0697941A1 (fr) 1996-02-28
DE59500559D1 (de) 1997-10-02
ATE157298T1 (de) 1997-09-15
CA2162894C (fr) 2003-12-09
KR960702376A (ko) 1996-04-27
GR3025090T3 (en) 1998-01-30
KR100353308B1 (ko) 2002-12-28
JP3609414B2 (ja) 2005-01-12
JPH08510419A (ja) 1996-11-05
DK0697941T3 (da) 1998-04-20
CA2162894A1 (fr) 1995-09-21
DE19509152A1 (de) 1995-10-26
DK0697941T4 (da) 2002-11-04
ES2107311T3 (es) 1997-11-16
WO1995024998A1 (fr) 1995-09-21
EP0697941B2 (fr) 2002-07-17
US5804035A (en) 1998-09-08

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