EP0304764B1 - Method of preparing a defibrated cellulosic meterial, in particular wood fibres, for the production of fibre boards - Google Patents
Method of preparing a defibrated cellulosic meterial, in particular wood fibres, for the production of fibre boards Download PDFInfo
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- EP0304764B1 EP0304764B1 EP88113246A EP88113246A EP0304764B1 EP 0304764 B1 EP0304764 B1 EP 0304764B1 EP 88113246 A EP88113246 A EP 88113246A EP 88113246 A EP88113246 A EP 88113246A EP 0304764 B1 EP0304764 B1 EP 0304764B1
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- Prior art keywords
- steam
- resin
- fiber particles
- fiber
- particles
- Prior art date
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- 239000000835 fiber Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229920002522 Wood fibre Polymers 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000002245 particle Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 239000011347 resin Substances 0.000 claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 229920002678 cellulose Polymers 0.000 claims abstract description 7
- 239000001913 cellulose Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000012670 alkaline solution Substances 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 claims abstract 2
- 239000002025 wood fiber Substances 0.000 claims description 24
- 239000002023 wood Substances 0.000 claims description 17
- 239000012792 core layer Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims 1
- 238000004537 pulping Methods 0.000 claims 1
- 239000002344 surface layer Substances 0.000 claims 1
- 229920003002 synthetic resin Polymers 0.000 claims 1
- 239000000057 synthetic resin Substances 0.000 claims 1
- 238000010792 warming Methods 0.000 claims 1
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000007664 blowing Methods 0.000 description 11
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241001070941 Castanea Species 0.000 description 1
- 235000014036 Castanea Nutrition 0.000 description 1
- 241001070947 Fagus Species 0.000 description 1
- 235000010099 Fagus sylvatica Nutrition 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 235000020030 perry Nutrition 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002916 wood waste Substances 0.000 description 1
Images
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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
-
- 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 process for the production of shredded cellulose material, in particular wood fibers, up to a fiber length of 20 mm, which is provided with a high proportion of thermosetting resin.
- the glued wood fibers are suitable for the production of decorative molded parts, whereby they are first formed into a fiber mat and then pressed at high temperature.
- the method according to the invention is based on the known methods in which wood chips are first softened with steam and then, e.g. between two grinding disks, into wood fibers with a length of up to 20 mm. An aqueous alkaline solution of a thermosetting resin is then applied to the moist wood fibers and the glued wood fibers e.g. dried with hot air to a residual moisture content below 15% by weight (EP-B-0 081 147).
- this known method is carried out, however, there is a risk that the resinous particles stick to the wall of the drying tube during drying and, in extreme cases, clog the drying tube, whereby self-ignition easily occurs.
- the invention further relates to a decorative plate comprising a core layer and a decorative layer on one or both sides, in which the core layer consists of the fiber particles produced according to claim 1.
- the plate is a flat body, the surface shape and surface structure of which is adapted to the application and which e.g. can also have a curved shape.
- the plate is preferably a body with a substantially flat surface. Their thickness is in particular in the range from 0.5 to 30 mm. Plates of this type are described in particular in EP-B-0 081 147.
- the plate according to the invention expediently has a scratch-resistant surface as described in EP-A-0 166 153 and EP-A-0 216 269.
- Fibrous cellulose material is to be understood in particular as fibrous wood particles.
- You will be out Produced wood types that allow defibering for example from softwood, such as spruce or pine, or hardwood, such as chestnut or beech wood.
- cellulose fibers and industrial wood, paper and cellulose waste for example also wood flour or wood pulp, can be used; Waste from woodworking workshops is also suitable. It is also possible to replace part of the wood fibers, cellulose fibers or wood waste, preferably up to 20% by weight, with plastic waste, for example in the form of fibers or granules.
- the wood is washed to remove traces of metal, stone or sand, then crushed into wood chips in a mill.
- the wood chips are softened in a digestor (steam boiler) with water vapor under steam pressure of 1 to 10 bar in a few minutes and then, e.g. between two grinding disks in a refiner, chopped into wood fibers.
- a digestor steam boiler
- the wood fibers thus digested have a length of 0.3 to 20 mm, an average length of 0.5 to 3 mm and an average diameter of 0.025 to 0.05 mm.
- the diameter range is between 0.01 and 1 mm, depending on the raw wood used and the defibration conditions.
- the length and diameter of the cellulose fibers used are in the same dimensional range.
- the fiber particles emerging from the fiberizing machine are blown in a hot steam stream in a blowing system transported under increased pressure, preferably at 2 to 10 bar, in particular 4 to 6 bar, in turbulent flow.
- thermosetting resin is added in an aqueous, preferably alkaline solution, which is sprayed into the blowing system. Due to the turbulent flow, caused by a correspondingly small dimensioning of the blow pipe ("blow line") and an applied pressure difference over the length of the blow pipe, an optimal mixture between resin and fiber particles takes place, even with very large amounts of resin, which are 200 to 1,000 g, in particular 300 to 600 g, can be 1,000 g of dry fibers.
- the thermosetting resin is preferably a phenol-formaldehyde resin, as is customary for the production of decorative building boards (EP-B-0 081 147).
- the mixture of water vapor and resinous fiber particles is led from the blowing system to a unit, where the resinous fiber particles are removed from the water vapor.
- the water vapor is preferably completely separated off.
- the fiber particles then still have a water content of 15 to 35% by weight, in particular 18 to 25% by weight.
- This stage is advantageously carried out in a cyclone separator at atmospheric pressure, in particular without energy supply, but in principle other devices are also suitable with which systems made of solid particles, such as dust, and gases can be separated from one another.
- Such devices are, for example, devices that work on the principle of gravity or centrifugal force and / or are constructed from filters or mechanical separators (cf. Perry's Chemical Engineers' Handbook, 6th ed.
- the fiber particles are expediently blown through a drying tube heated with warm air, and are finely distributed by the air flow.
- the warm air preferably has a temperature of 60 to 110 ° C.
- the dried fibers leave the drying stage, for example, via a further cyclone separator or a similar device and are passed on for further processing, in particular for the production of decorative building boards, as described, for example, in EP-B-0 081 147.
- the method surprisingly shows a combination of advantages. This largely prevents the presence of water vapor in the dryer, which means that the energy requirement is relatively low. The risk of fire is also significantly reduced. There is no danger in the blowing system or in the dryer that their function will be disturbed by adhering material.
- the method does not require a great deal of equipment, and additional units for mixing and / or conveying the fiber particles are not required.
- the fibers obtained after the drying stage are not agglomerated, so that they can be easily formed into compressible fiber mats.
- the invention is illustrated by the following example and the figure.
- the figure schematically shows the process flow.
- Wood chips with approximately the same weight of water are continuously fed into a container 1 and treated in the boiler 2 with hot steam. After a dwell time of a few minutes, the softened wood chips are transported on to a refiner 3, where they are shredded into wood fibers between two grinding disks.
- the wood fibers are passed on with hot water steam in a blowing system 4, into which thermosetting phenol-formaldehyde resin in aqueous alkaline solution is sprayed via the resin injector 5.
- the blowing system 4 is cooled from the outside with water (cooling jacket 6).
- the mixture of water vapor and resinous wood fibers obtained then passes into a cyclone separator 7 under atmospheric pressure.
- the resin-coated or impregnated wood fibers are passed through a cell lock 9 into a drying tube 10 for the remaining drying, which they leave with a residual moisture content of 7% by weight.
- the wood fibers are conveyed further into a cyclone separator 11 by the dryer air and transported via a cell lock to a forming station 12, where they are deposited on a belt and pre-compressed into a fiber mat.
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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)
- Paper (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Prostheses (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Removal Of Floating Material (AREA)
- Photoreceptors In Electrophotography (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von zerfasertem Zellulosematerial, insbesondere Holzfasern, bis zu einer Faserlänge von 20 mm, welches mit einem hohen Anteil an hitzehärtbarem Harz versehen ist. Die beleimten Holzfasern sind geeignet zur Herstellung von dekorativen Formteilen, wobei sie zunächst zu einer Fasermatte geformt und dann bei hoher Temperatur verpreßt werden.The invention relates to a process for the production of shredded cellulose material, in particular wood fibers, up to a fiber length of 20 mm, which is provided with a high proportion of thermosetting resin. The glued wood fibers are suitable for the production of decorative molded parts, whereby they are first formed into a fiber mat and then pressed at high temperature.
Das erfindungsgemäße Verfahren geht von den bekannten Verfahren aus, bei denen zunächst Holzschnitzel mit Wasserdampf erweicht und anschließend, z.B. zwischen zwei Mahlscheiben, zu Holzfasern mit einer Länge bis zu 20 mm zerkleinert werden. Auf die feuchten Holzfasern wird danach eine wäßrige alkalische Lösung eines hitzehärtbaren Harzes aufgebracht und die beleimten Holzfasern z.B. mit Heißluft bis zu einer Restfeuchte unter 15 Gew.-% getrocknet (EP-B-0 081 147). Bei der Durchführung dieses bekannten Verfahrens besteht allerdings die Gefahr, daß beim Trocknen die beharzten Teilchen an der Wand des Trockenrohres verkleben und im Extremfall das Trockenrohr verstopfen, wodurch leicht Selbstentzündung eintritt.The method according to the invention is based on the known methods in which wood chips are first softened with steam and then, e.g. between two grinding disks, into wood fibers with a length of up to 20 mm. An aqueous alkaline solution of a thermosetting resin is then applied to the moist wood fibers and the glued wood fibers e.g. dried with hot air to a residual moisture content below 15% by weight (EP-B-0 081 147). When this known method is carried out, however, there is a risk that the resinous particles stick to the wall of the drying tube during drying and, in extreme cases, clog the drying tube, whereby self-ignition easily occurs.
Es ist auch bekannt, die Holzfasern nach der Zerfaserungsstation in einem Wasserdampf-Luftstrom zu führen, einen Großteil des Dampfstromes von den Holzfasern vor dem Harzauftrag zu entfernen, auf die vom restlichen Dampfstrom in einer Blasanlage mitgenommenen Faserteilchen die wäßrige Harzlösung aufzubringen und danach die beleimten Holzfasern zu trocknen (DE-A-36 09 506). Dieses Verfahren zeigt zwar den Vorteil, daß aufgrund des vorher reduzierten Dampfanteils bei der Trocknung relativ wenig Energie erforderlich ist. Jedoch besteht bei diesem Verfahren die Gefahr, daß sich die Harzlösung unzureichend mit den Holzfasern durchmischt und eine unerwünschte Vorverdichtung eintritt, wodurch bei der Weiterverarbeitung der beleimten Holzfasern nach dem Trocknen Probleme auftreten können. Durch schlechte Durchmischung der Holzfasern mit dem Harz entstehen Harztropfen, welche in der fertigen Platte Leimnester bilden. Diese führen zu unerwünschten optischen und technischen Qualitätsminderungen. Diese Nachteile des bekannten Verfahrens sind besonders gravierend, wenn relativ große Harzmengen bezogen auf die Holzfasermenge eingesetzt werden sollen, wie es beispielsweise nach der EP-B-0 081 147 vorgesehen ist. Ein weiterer Nachteil besteht darin, daß bei den großen Harzmengen nach der EP-B-0 081 147 die in der Figur der DE-A-36 09 506 mit 28 bezeichnete Leitung sich mit Harz und Faserteilchen zusetzen würde.It is also known to guide the wood fibers in a steam-air stream after the defibration station, a large part of the steam stream from the wood fibers to remove the resin application, to apply the aqueous resin solution to the fiber particles entrained by the remaining steam flow in a blowing system and then to dry the glued wood fibers (DE-A-36 09 506). This method has the advantage that, due to the previously reduced steam content, relatively little energy is required for drying. However, there is a risk with this method that the resin solution mixes insufficiently with the wood fibers and undesirable pre-compression occurs, which can cause problems in the further processing of the glued wood fibers after drying. Poor mixing of the wood fibers with the resin creates resin drops, which form glue nests in the finished board. These lead to undesirable optical and technical quality reductions. These disadvantages of the known method are particularly serious if relatively large amounts of resin are to be used based on the amount of wood fiber, as is provided, for example, in EP-B-0 081 147. Another disadvantage is that with the large amounts of resin according to EP-B-0 081 147, the line designated 28 in the figure of DE-A-36 09 506 would clog with resin and fiber particles.
Ausgehend von dem aufgezeigten Stand der Technik ist es deshalb Aufgabe der Erfindung, ein Verfahren anzugeben, welches selbst bei Zugabe von großen Mengen an Harz, bezogen auf die Menge der Faserteilchen, ein gleichmäßiges Vermischen der Faserteilchen mit dem Harz gewährleistet und bei dem die Gefahr einer Verstopfung des Trockenrohres durch miteinander verklebte Faserteilchen und daraus resultierender Selbstentzündung nicht mehr vorhanden ist. Gleichzeitig soll es einen kostengünstigen Transport der Faserteilchen gestatten, d.h. mit geringem apparativen Aufwand durchführbar sein, und mit einem verhältnismäßig geringen Energieaufwand auskommen, wobei trotz der großen Menge an zugesetztem Harz nur geringe Dampfmengen erforderlich werden. Die Kombination aller dieser vorteilhaften Eigenschaften wurde bisher von keinem Verfahren erreicht.Starting from the prior art shown, it is therefore an object of the invention to provide a method which, even when large amounts of resin are added, based on the amount of fiber particles, ensures uniform mixing of the fiber particles with the resin and in which there is a risk of Blockage of the drying tube due to fiber particles glued together and resulting self-ignition is no longer present. At the same time, it should allow inexpensive transport of the fiber particles, ie be able to be carried out with little expenditure on equipment, and use a relatively small amount of energy, although in spite of the large amount of resin added, only small amounts of steam are required. The combination of all these advantageous properties has never been achieved by any method.
Diese Aufgabe wird erfindungsgemäß durch das Verfahren mit den in Anspruch 1 genannten Merkmalen gelöst. Die abhängigen Ansprüche geben zweckmäßige Weiterbildungen des Verfahrens an. Gegenstand der Erfindung ist ferner eine dekorative Platte, umfassend eine Kernschicht und eine ein- oder beidseitige dekorative Schicht, bei der die Kernschicht aus den nach Anspruch 1 hergestellten Faserteilchen besteht. Die Platte ist ein flächenhafter Körper, dessen Oberflächenform und Oberflächenstruktur dem Anwendungszweck angepaßt ist und der z.B. auch gebogene Form aufweisen kann. Vorzugsweise ist die Platte ein Körper mit im wesentlichen ebener Fläche. Ihre Dicke liegt insbesondere im Bereich von 0,5 bis 30 mm. Platten dieser Art sind insbesondere in der EP-B-0 081 147 beschrieben. Die erfindungsgemäße Platte hat zweckmäßigerweise eine kratzfeste Oberfläche wie in EP-A-0 166 153 und EP-A-0 216 269 beschrieben.This object is achieved by the method with the features mentioned in claim 1. The dependent claims indicate expedient developments of the method. The invention further relates to a decorative plate comprising a core layer and a decorative layer on one or both sides, in which the core layer consists of the fiber particles produced according to claim 1. The plate is a flat body, the surface shape and surface structure of which is adapted to the application and which e.g. can also have a curved shape. The plate is preferably a body with a substantially flat surface. Their thickness is in particular in the range from 0.5 to 30 mm. Plates of this type are described in particular in EP-B-0 081 147. The plate according to the invention expediently has a scratch-resistant surface as described in EP-A-0 166 153 and EP-A-0 216 269.
Unter zerfasertem Zellulosematerial sind insbesondere faserförmige Holzpartikel zu verstehen. Sie werden aus Holzarten hergestellt, die eine Zerfaserung erlauben, z.B. aus Nadelholz, wie Fichten- oder Kiefernholz, oder Laubholz, wie Kastanien- oder Buchenholz. Weiterhin können zusätzlich zu den Holzfasern Zellulosefasern und industrielle Holz-, Papier- und Zelluloseabfälle, z.B. auch Holzmehl oder Holzschliff, verwendet werden; ebenso sind Abfälle aus holzverarbeitenden Werkstätten geeignet. Es ist auch möglich, einen Teil der Holzfasern, der Zellulosefasern bzw. der Holzabfälle, vorzugsweise bis zu 20 Gew.-%, durch Kunststoffabfälle, z.B. in Form von Fasern oder Granulat, zu ersetzen. Das Holz wird gewaschen, um Metall-, Stein- oder Sandspuren zu entfernen, danach in einer Mühle zu Holzschnitzeln zerkleinert.Fibrous cellulose material is to be understood in particular as fibrous wood particles. You will be out Produced wood types that allow defibering, for example from softwood, such as spruce or pine, or hardwood, such as chestnut or beech wood. In addition to the wood fibers, cellulose fibers and industrial wood, paper and cellulose waste, for example also wood flour or wood pulp, can be used; Waste from woodworking workshops is also suitable. It is also possible to replace part of the wood fibers, cellulose fibers or wood waste, preferably up to 20% by weight, with plastic waste, for example in the form of fibers or granules. The wood is washed to remove traces of metal, stone or sand, then crushed into wood chips in a mill.
Die Holzschnitzel werden in einem Digestor (Dampfkessel) mit Wasserdampf unter Wasserdampfdruck von 1 bis 10 bar in wenigen Minuten erweicht und anschließend, z.B. zwischen zwei Mahlscheiben in einem Raffineur, zu Holzfasern zerkleinert.The wood chips are softened in a digestor (steam boiler) with water vapor under steam pressure of 1 to 10 bar in a few minutes and then, e.g. between two grinding disks in a refiner, chopped into wood fibers.
Die auf diese Weise aufgeschlossenen Holzfasern haben eine Länge von 0,3 bis 20 mm, eine mittlere Länge von 0,5 bis 3 mm und einen mittleren Durchmesser von 0,025 bis 0,05 mm. Der Durchmesserbereich liegt zwischen 0,01 und 1 mm, in Abhängigkeit des verwendeten Rohholzes und der Zerfaserungsbedingungen. Länge und Durchmesser der verwendeten Zellulosefasern liegen in dem gleichen Dimensionsbereich.The wood fibers thus digested have a length of 0.3 to 20 mm, an average length of 0.5 to 3 mm and an average diameter of 0.025 to 0.05 mm. The diameter range is between 0.01 and 1 mm, depending on the raw wood used and the defibration conditions. The length and diameter of the cellulose fibers used are in the same dimensional range.
Die aus der Zerfaserungsmaschine austretenden Faserteilchen werden in heißem Wasserdampfstrom in einer Blasanlage unter erhöhtem Druck, vorzugsweise bei 2 bis 10 bar, insbesondere 4 bis 6 bar, in turbulenter Strömung weitertransportiert.The fiber particles emerging from the fiberizing machine are blown in a hot steam stream in a blowing system transported under increased pressure, preferably at 2 to 10 bar, in particular 4 to 6 bar, in turbulent flow.
Die Zugabe des hitzehärtbaren Harzes erfolgt in wäßriger, vorzugsweise alkalischer Lösung, welche in die Blasanlage eingesprüht wird. Durch die turbulente Strömung, hervorgerufen durch eine entsprechend kleine Dimensionierung des Blasrohres ("blow line") und eine angelegte Druckdifferenz über die Länge des Blasrohres, findet eine optimale Mischung zwischen Harz und Faserteilchen statt, selbst bei sehr großen Mengen an Harz, welche 200 bis 1 000 g, insbesondere 300 bis 600 g, je 1 000 g Trockenfasern betragen können. Das hitzehärtbare Harz ist vorzugsweise ein Phenol-Formaldehyd-Harz, wie es zur Herstellung von dekorativen Bauplatten (EP-B-0 081 147) üblich ist.The thermosetting resin is added in an aqueous, preferably alkaline solution, which is sprayed into the blowing system. Due to the turbulent flow, caused by a correspondingly small dimensioning of the blow pipe ("blow line") and an applied pressure difference over the length of the blow pipe, an optimal mixture between resin and fiber particles takes place, even with very large amounts of resin, which are 200 to 1,000 g, in particular 300 to 600 g, can be 1,000 g of dry fibers. The thermosetting resin is preferably a phenol-formaldehyde resin, as is customary for the production of decorative building boards (EP-B-0 081 147).
Es hat sich als besonders vorteilhaft erwiesen, die Blasanlage im Bereich nach der Harzzugabe vorzugsweise bis zur Abtrennung vom Wasserdampf von außen zu kühlen, so daß sich eine dünne Schicht aus Kondenswasser auf der Innenwand der Blasanlage abscheidet. Hierzu reicht es aus, wenn die Temperatur der Wandung der Blasanlage um wenige Grad abgesenkt wird, als zweckmäßig hat sich eine Temperaturabsenkung um 5 bis 20°C erwiesen. Damit wird das Anhaften der beharzten Faserteilchen an der Innenwand der Blasanlage wirksam verhindert.It has proven to be particularly advantageous to cool the blowing system in the area after the addition of resin, preferably until it is separated from the water vapor from the outside, so that a thin layer of condensed water is deposited on the inner wall of the blowing system. To do this, it is sufficient if the temperature of the wall of the blowing system is reduced by a few degrees; a temperature reduction of 5 to 20 ° C. has proven to be expedient. This effectively prevents the resinous fiber particles from adhering to the inner wall of the blowing system.
Das Gemisch aus Wasserdampf und beharzten Faserteilchen wird von der Blasanlage zu einer Einheit geführt, wo die beharzten Faserteilchen vom Wasserdampf entfernt werden. In dieser Stufe wird der Wasserdampf vorzugsweise vollständig abgetrennt. Die Faserteilchen besitzen danach noch einen Wassergehalt von 15 bis 35 Gew.-%, insbesondere 18 bis 25 Gew.-%. Diese Stufe wird vorteilhafterweise in einem Zyklonenseparator bei Atmosphärendruck, insbesondere ohne Energiezufuhr, durchgeführt, jedoch sind prinzipiell auch andere Einrichtungen geeignet, mit denen Systeme aus Feststoffteilchen, wie z.B. Staub, und Gase voneinander getrennt werden können. Solche Einrichtungen sind beispielsweise Vorrichtungen, die nach dem Prinzip der Schwerkraft oder Zentrifugalkraft arbeiten und/oder aus Filtern oder mechanischen Separatoren aufgebaut sind (vgl. Perry's Chemical Engineers' Handbook, 6th ed. (1985), McGraw-Hill Book Company, "DUST-COLLECTOR DESIGN", 20-81 bis 20-89). Der abgetrennte Wasserdampf wird aus Gründen der Energieersparnis wieder in den Verfahrensablauf eingeführt und zweckmäßigerweise zur Erwärmung und zum Einweichen der noch zu zerfasernden Holzschnitzel verwendet. Auch überschüssiges härtbares Harz kann zusammen mit dem Wasserdampf abgetrennt werden und einer erneuten Verwendung zugeführt werden.The mixture of water vapor and resinous fiber particles is led from the blowing system to a unit, where the resinous fiber particles are removed from the water vapor. In this stage, the water vapor is preferably completely separated off. The fiber particles then still have a water content of 15 to 35% by weight, in particular 18 to 25% by weight. This stage is advantageously carried out in a cyclone separator at atmospheric pressure, in particular without energy supply, but in principle other devices are also suitable with which systems made of solid particles, such as dust, and gases can be separated from one another. Such devices are, for example, devices that work on the principle of gravity or centrifugal force and / or are constructed from filters or mechanical separators (cf. Perry's Chemical Engineers' Handbook, 6th ed. (1985), McGraw-Hill Book Company, "DUST- COLLECTOR DESIGN ", 20-81 to 20-89). The separated water vapor is reintroduced into the process sequence in order to save energy and is expediently used for heating and soaking the wood chips still to be defibrated. Excess hardenable resin can also be separated off together with the water vapor and used again.
In der nachfolgenden Trockenstufe wird der Endfeuchtigkeitsgehalt von kleiner als 12 Gew.-%, insbesondere 3 bis 10 Gew.-%, erreicht. Hierzu werden die Faserteilchen zweckmäßigerweise durch ein mit Warmluft beheiztes Trockenrohr geblasen, wobei sie durch den Luftstrom fein verteilt werden. Die Warmluft weist vorzugsweise eine Temperatur von 60 bis 110°C auf. Die getrockneten Fasern verlassen die Trockenstufe beispielsweise über einen weiteren Zyklonenseparator oder eine ähnliche Einrichtung und werden der Weiterverarbeitung zugeführt, insbesondere zur Herstellung von dekorativen Bauplatten, wie sie beispielsweise in der EP-B-0 081 147 beschrieben sind.In the subsequent drying stage, the final moisture content of less than 12% by weight, in particular 3 to 10% by weight, is reached. For this purpose, the fiber particles are expediently blown through a drying tube heated with warm air, and are finely distributed by the air flow. The warm air preferably has a temperature of 60 to 110 ° C. The dried fibers leave the drying stage, for example, via a further cyclone separator or a similar device and are passed on for further processing, in particular for the production of decorative building boards, as described, for example, in EP-B-0 081 147.
Das Verfahren zeigt in überraschender Weise eine Kombination von Vorteilen. So wird die Anwesenheit von Wasserdampf im Trockner weitgehend verhindert, wodurch der Energiebedarf relativ niedrig ist. Auch die Brandgefahr ist deutlich verringert. Weder in der Blasanlage noch im Trockner besteht die Gefahr, daß sie durch anhaftendes Material in ihrer Funktion gestört werden. Das Verfahren benötigt keinen großen apparativen Aufwand, zusätzliche Einheiten zum Mischen und/oder Fördern der Faserteilchen sind nicht erforderlich. Die nach der Trockenstufe erhaltenen Fasern sind nicht agglomeriert, so daß sie sich problemlos zu verpreßbaren Fasermatten formen lassen.The method surprisingly shows a combination of advantages. This largely prevents the presence of water vapor in the dryer, which means that the energy requirement is relatively low. The risk of fire is also significantly reduced. There is no danger in the blowing system or in the dryer that their function will be disturbed by adhering material. The method does not require a great deal of equipment, and additional units for mixing and / or conveying the fiber particles are not required. The fibers obtained after the drying stage are not agglomerated, so that they can be easily formed into compressible fiber mats.
Die Erfindung wird durch das nachfolgende Beispiel und die Figur näher erläutert. Die Figur zeigt schematisch den Verfahrensablauf.The invention is illustrated by the following example and the figure. The figure schematically shows the process flow.
In einen Behälter 1 werden kontinuierlich Holzhackschnitzel mit etwa gleicher Gewichtsmenge an Wasser zugeführt und im Kessel 2 mit Heißwasserdampf behandelt. Nach einer Verweilzeit von wenigen Minuten werden die erweichten Hackschnitzel zu einem Raffineur 3 weitertransportiert, wo sie zwischen zwei Mahlscheiben zu Holzfasern zerkleinert werden. Die Holzfasern werden mit Heißwasserdampf in einer Blasanlage 4 weitergeleitet, in welche hitzehärtbares Phenol-Formaldehyd-Harz in wäßriger alkalischer Lösung über den Harzinjektor 5 eingesprüht werden. Im nachfolgenden Teil wird die Blasanlage 4 von außen mit Wasser (Kühlungsmantel 6) gekühlt. Die erhaltene Mischung aus Wasserdampf und beharzten Holzfasern gelangt danach in einen Zyklonenseparator 7 unter Atmosphärendruck. Hier wird der Wasserdampf entfernt und über die Leitung 8 zum Hackschnitzelbehälter 1 zur Erhitzung der Holzteilchen zurückgeführt. Die mit Harz beschichteten bzw. imprägnierten Holzfasern werden zur restlichen Trocknung durch eine Zellenschleuse 9 in ein Trockenrohr 10 geleitet, welches sie mit einer Restfeuchte von 7 Gew.-% verlassen. Durch die Trocknerluft werden die Holzfasern in einen Zyklonenseparator 11 weitergefördert und über eine Zellenschleuse zu einer Formungssstation 12 transportiert, wo sie auf ein Band abgelagert und zu einer Fasermatte vorverdichtet werden.Wood chips with approximately the same weight of water are continuously fed into a container 1 and treated in the boiler 2 with hot steam. After a dwell time of a few minutes, the softened wood chips are transported on to a
Claims (10)
- Process for the production of pulped cellulose material, preferably wood fibers, in particular wood fibers up to a fiber length of 20 mm, which is provided with a high proportion of thermocurable resin and is suitable, in particular, for the production of fiber-containing moldings, the thermocurable resin being added in aqueous, preferably alkaline solution to a mixture of fiber particles and steam, and the steam being removed from the resin-coated fiber particles in a drier, characterized in that the steam is removed in a unit from the mixture of steam and fiber particles after addition of the resin, and the fiber particles are subsequently dried in a drying stage to a moisture content of less than 12 % by weight, in particular 3 to 10 % by weight.
- The process as claimed in claim 1, characterized in that removal of the steam takes place using a cyclone separator, preferably without supply of energy.
- The process as claimed in claim 1 or 2, characterized in that the drying stage takes place using warm air, preferably at a temperature from 60 to 110 °C.
- The process as claimed in any of claims 1 to 3, characterized in that the thermocurable resin is applied in aqueous solution to the fiber particles transported in a steam stream, the mixture of resin-coated fiber particles is transported through an externally cooled line, the steam is then removed completely, and the drying stage is subsequently carried out.
- The process as claimed in any of claims 1 to 4, characterized in that the steam stream containing the fiber particles is conveyed under increased pressure, preferably from 2 to 10 bar, in particular 4 to 6 bar, in turbulent flow.
- The process as claimed in any of claims 1 to 5, characterized in that the amount of resin added (dry weight) is 200 to 1000 g, preferably 300 to 600 g, per 1000 g of fiber particles (dry weight).
- The process as claimed in any of claims 1 to 6, characterized in that the removed steam is employed for warming the wood chippings still to be pulped.
- The process as claimed in any of claims 1 to 7, characterized in that the fiber particles are separated from the dry air after the drying stage, preferably in a further cyclone separator.
- The process as claimed in any of claims 1 to 8, characterized in that, for pulping the cellulose material, cellulose particles, in particular wood chippings, are comminuted under steam pressure to a maximum fiber length of 20 mm, that the fiber particles obtained are transported on mixed with steam under increased pressure, preferably at 2 to 10 bar, in particular 4 to 6 bar, in a blow plant, and that the aqueous resin solution is sprayed into the blow plant.
- Decorative board comprising a core layer and decorative surface layers on one or both sides thereof, characterized in that the core layer comprises the wood fibers produced in accordance with claim 1 which have been thermopressed with a thermocurable synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88113246T ATE86166T1 (en) | 1987-08-22 | 1988-08-16 | PROCESS FOR THE MANUFACTURE OF FIBERIZED CELLULOSIC MATERIAL, ESPECIALLY WOOD FIBERS, FOR THE MANUFACTURE OF FIBER BOARDS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3728123 | 1987-08-22 | ||
| DE19873728123 DE3728123A1 (en) | 1987-08-22 | 1987-08-22 | METHOD FOR THE PRODUCTION OF FRINGED CELLULOSE MATERIAL, IN PARTICULAR WOOD FIBERS, FOR THE PRODUCTION OF FIBER PANELS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0304764A2 EP0304764A2 (en) | 1989-03-01 |
| EP0304764A3 EP0304764A3 (en) | 1989-11-29 |
| EP0304764B1 true EP0304764B1 (en) | 1993-03-03 |
Family
ID=6334325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88113246A Revoked EP0304764B1 (en) | 1987-08-22 | 1988-08-16 | Method of preparing a defibrated cellulosic meterial, in particular wood fibres, for the production of fibre boards |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4937100A (en) |
| EP (1) | EP0304764B1 (en) |
| JP (1) | JPS6471704A (en) |
| AT (1) | ATE86166T1 (en) |
| AU (1) | AU601868B2 (en) |
| CA (1) | CA1295441C (en) |
| DE (2) | DE3728123A1 (en) |
| DK (1) | DK167428B1 (en) |
| FI (1) | FI883833A (en) |
| NO (1) | NO170465C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10037983B4 (en) * | 2000-08-03 | 2006-04-13 | Stefan Zikeli | Polymer composition and molded articles containing it containing alkaloid |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3891143T1 (en) * | 1987-12-16 | 1990-09-20 | Sunds Defibrator | METHOD AND DEVICE FOR PRODUCING FIBER PANELS |
| US5064689A (en) | 1989-03-20 | 1991-11-12 | Weyerhaeuser Company | Method of treating discontinuous fibers |
| US5432000A (en) | 1989-03-20 | 1995-07-11 | Weyerhaeuser Company | Binder coated discontinuous fibers with adhered particulate materials |
| US5230959A (en) | 1989-03-20 | 1993-07-27 | Weyerhaeuser Company | Coated fiber product with adhered super absorbent particles |
| US5498478A (en) | 1989-03-20 | 1996-03-12 | Weyerhaeuser Company | Polyethylene glycol as a binder material for fibers |
| AU665532B2 (en) * | 1991-04-26 | 1996-01-11 | Enviroflex Pty. Ltd. | Insulation pellets and a process for producing same |
| CA2126240A1 (en) | 1991-12-17 | 1993-06-24 | Paul Gaddis | Hopper blender system and method for coating fibers |
| DE19515734A1 (en) * | 1995-05-03 | 1996-11-07 | Schenkmann & Piel Verfahrenste | Process for the production of wood fibers |
| DE19746383A1 (en) * | 1997-10-21 | 1999-04-22 | Hofa Homann Gmbh & Co Kg | Fiber panel, manufacturing plant and process |
| IE990100A1 (en) | 1998-10-30 | 2000-05-03 | Masonite Corp | Method of making molded Composite articles |
| US7410687B2 (en) * | 2004-06-08 | 2008-08-12 | Trex Co Inc | Variegated composites and related methods of manufacture |
| DE102004062649C5 (en) | 2004-12-21 | 2013-06-06 | Kronotec Ag | Process for the production of a wood fiber insulation board or mats and wood fiber insulation boards or mats produced by this process |
| WO2006092603A1 (en) * | 2005-03-02 | 2006-09-08 | University Of Wales, Bangor | Treatment of long fibres in a high pressure gas stream |
| DE102008026677B3 (en) * | 2008-06-04 | 2009-10-22 | Kronotec Ag | Drying lignocellulose fibers, for fiberboard production, has a separator to detach fibers from a steam flow for drying with recovered steam for heating the wood chip start material |
| DE102008056650A1 (en) * | 2008-11-10 | 2010-05-12 | Martin Dreisman | Composition and method of making a wood or fiberboard |
| AT509429B1 (en) * | 2010-01-20 | 2016-09-15 | Erema | METHOD FOR PRODUCING A POLYMERIC MATERIAL FILLED WITH LONGER FIBERS |
| IT1399772B1 (en) | 2010-04-30 | 2013-05-03 | Imal Srl | APPARATUS FOR THE INJECTION OF CHEMICAL COMPONENTS IN A FLOW OF NON-INCORRENT WOODEN MATERIAL |
| UA114281C2 (en) * | 2010-10-01 | 2017-05-25 | Кроноплас Текнікел Аг | Method and apparatus for gluing wood particles |
| CA2872839A1 (en) * | 2012-06-01 | 2013-12-05 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Bend for introducing a steam-and-fibers stream into a dryer or a pulp chest of a fibers-processing plant, blow line with a bend, and fibers-processing plant with a blow line |
| AT514330B1 (en) * | 2013-08-01 | 2014-12-15 | Andritz Ag Maschf | Plant and method for processing fibrous materials |
| AT514329B1 (en) * | 2013-08-01 | 2014-12-15 | Andritz Ag Maschf | Plant and method for processing fibrous materials |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2817617A (en) * | 1953-03-19 | 1957-12-24 | Hugh R Rogers | Process of manufacturing board-like articles |
| DE3147989A1 (en) | 1981-12-04 | 1983-06-16 | Hoechst Ag, 6230 Frankfurt | DECORATIVE, IN PARTICULAR PLATE-SHAPED MOLDED PART, METHOD FOR THE PRODUCTION THEREOF AND THE USE THEREOF |
| DE3418282A1 (en) * | 1984-05-17 | 1985-11-21 | Hoechst Ag, 6230 Frankfurt | DECORATIVE PLATE WITH IMPROVED SURFACE PROPERTIES |
| DE3609506A1 (en) * | 1985-03-25 | 1986-10-30 | Koppers Co., Inc., Pittsburgh, Pa. | Process for producing a composition from cellulose particles and resin for the production of fibre boards |
| DE3533737A1 (en) * | 1985-09-21 | 1987-03-26 | Hoechst Ag | DECORATIVE PLATE WITH IMPROVED SURFACE PROPERTIES |
-
1987
- 1987-08-22 DE DE19873728123 patent/DE3728123A1/en not_active Withdrawn
-
1988
- 1988-08-09 US US07/230,049 patent/US4937100A/en not_active Expired - Fee Related
- 1988-08-15 CA CA000574708A patent/CA1295441C/en not_active Expired - Fee Related
- 1988-08-16 DE DE8888113246T patent/DE3878785D1/en not_active Revoked
- 1988-08-16 EP EP88113246A patent/EP0304764B1/en not_active Revoked
- 1988-08-16 AT AT88113246T patent/ATE86166T1/en not_active IP Right Cessation
- 1988-08-16 AU AU21074/88A patent/AU601868B2/en not_active Ceased
- 1988-08-18 FI FI883833A patent/FI883833A/en not_active Application Discontinuation
- 1988-08-19 NO NO883735A patent/NO170465C/en unknown
- 1988-08-19 DK DK465988A patent/DK167428B1/en not_active IP Right Cessation
- 1988-08-22 JP JP63206518A patent/JPS6471704A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10037983B4 (en) * | 2000-08-03 | 2006-04-13 | Stefan Zikeli | Polymer composition and molded articles containing it containing alkaloid |
Also Published As
| Publication number | Publication date |
|---|---|
| DK465988A (en) | 1989-02-23 |
| DE3878785D1 (en) | 1993-04-08 |
| ATE86166T1 (en) | 1993-03-15 |
| NO883735L (en) | 1989-02-23 |
| EP0304764A2 (en) | 1989-03-01 |
| FI883833A0 (en) | 1988-08-18 |
| FI883833A (en) | 1989-02-23 |
| JPS6471704A (en) | 1989-03-16 |
| DE3728123A1 (en) | 1989-03-02 |
| US4937100A (en) | 1990-06-26 |
| AU2107488A (en) | 1989-02-23 |
| NO170465C (en) | 1992-10-21 |
| NO883735D0 (en) | 1988-08-19 |
| DK465988D0 (en) | 1988-08-19 |
| AU601868B2 (en) | 1990-09-20 |
| EP0304764A3 (en) | 1989-11-29 |
| CA1295441C (en) | 1992-02-11 |
| NO170465B (en) | 1992-07-13 |
| DK167428B1 (en) | 1993-11-01 |
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