EP1775086A2 - Method of making brightly coloured fibre boards - Google Patents

Method of making brightly coloured fibre boards Download PDF

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Publication number
EP1775086A2
EP1775086A2 EP06021519A EP06021519A EP1775086A2 EP 1775086 A2 EP1775086 A2 EP 1775086A2 EP 06021519 A EP06021519 A EP 06021519A EP 06021519 A EP06021519 A EP 06021519A EP 1775086 A2 EP1775086 A2 EP 1775086A2
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Prior art keywords
wood
wood fibers
pulp
refiner
fibers
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EP06021519A
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German (de)
French (fr)
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EP1775086A3 (en
EP1775086B1 (en
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Alfred Dr. Pfemeter
Norbert Dr. Kalwa
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Glunz AG
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Glunz AG
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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

Definitions

  • the invention relates to a method for the production of wood fiber boards with the features of the preamble of claim 1.
  • wood chips are fed to a refiner, where they are shredded in a water-moist atmosphere at elevated pressure and elevated temperature in the individual wood fibers.
  • the pressure in the refiner is released, whereby the wood fibers have been separated in the resulting water vapor.
  • the emerging from the refiner from suspended in the water vapor wood fibers is absorbed by a blowing passage.
  • the wood fibers are glued by spraying binder, for example an isocyanate-containing binder, onto the wood fibers.
  • the wood fibers from the blown passage enter a dryer into which the fiber moisture of the glued wood fibers is adjusted.
  • the glued and set in their fiber moisture wood fibers are scattered into mats as a preform for the desired fiberboard. These mats are pressed in a continuous or a platen press under elevated temperature to the fiberboard. Due to the increased temperature, the binder hardens and permanently bonds the individual wood fibers together.
  • Wood fiber boards have been used in the past without painting or otherwise covering the surface, which completely covered the natural color of the wood panels, typically dark brown. However, there is a younger tendency To use fiberboard without an opaque coating and instead to color the fiberboard itself.
  • An example of this describes the DE 20 2004 014 293 U .
  • isocyanate-containing binder it is possible to produce black, dark green or other dark-colored wood fiber boards by adding color pigments to the wood chips, which are fed to the refiner, the color pigments must be used in such a concentration that they have the typical dark brown base color drown out the wood fiber boards.
  • a method having the features of the preamble of claim 1 is known from DE 10 2004 050 278 A1 known.
  • wood chips are treated in the upstream of a refiner cooker with oxidizing agent to bleach the wood fibers contained in them.
  • the woodchips are then shredded by the refiner and further processed in the usual way.
  • the oxidizing agent acts on the entirety of the wood fibers in the wood chips only over very long periods of time, if any wood fibers are ever reached by the oxidizing agent. This speaks against the fact that in the application of the known method on a conventional wood fiber board manufacturing plant their usual throughput can be maintained.
  • the invention has for its object to provide a method having the features of the preamble of claim 1, which is suitable for the production of light-colored or dyed in bright colors wood fiber boards without resorting to light wood species on a conventional fiberboard manufacturing plant.
  • Wood fiber-containing pulp is obtained by mechanical pulping of solid wood. This fiber bundles and individual wood fibers are rubbed off the solid wood.
  • the grinding may be due to increased temperature (possibly in conjunction with increased pressure) and / or the addition of chemicals get supported.
  • different grinding devices can be used.
  • we speak of stone grinding, Drucksteinochliff, Refinerschliff, thermomechanical grinding, cherno-mechanical grinding and chemothermornochanischem grinding with a cut can also apply several of these terms.
  • Pulp which in this description always refers to wood fiber-containing pulp, is also commercially available under its English name "ground wood” in large quantities and is used, for example, as a cost-effective raw material for the production of packaging paper.
  • bleached pulp which in this specification only means that the pulp is bleached to a significant degree, but is not limited to a particular grade of pulp, is commercially available in large quantities. Bleached pulp is used, for example, for the manufacture of bright packaging papers and in particular for the production of newsprint.
  • pulp and also bleached pulp is excellently suitable as a starting material in the production of wood fiber boards on conventional wood fiber board production plants and, while maintaining appropriate quality, d.
  • the pulp in particular, easily passes through the refiner of conventional wood fiber board production plants, although the mechanical defibration taking place in a refiner has already occurred earlier and without the wood fibers being excessively reduced in size.
  • the oxidants typically used for the chemical bleaching of pulp arrive in the new process, which emanates from already bleached pulp, only in no longer relevant residues in the equipment and the water cycle. This also applies if additional oxidizing agents are used in the new processes in order to produce, for example, particularly light fiberboard.
  • additional oxidizing agent is preferably carried out in the refiner, in which the wood fibers are made out of the pulp out.
  • the dyes are added before the refiner, they also have a maximum time to evenly attach to the wood fibers. Also in this respect, the use of wood fibers instead of coarser wood chips is an advantage, because the dyes only ever the wood fibers can reach the surface of the Ninatedais, and in woodchips a very significant proportion of wood fiber below the respective particle surface and therefore is initially unavailable for the dyes,
  • the dyes added to the wood fibers in the new process are generally disperse dyes based on color pigments. These have a high light and temperature resistance.
  • Organic colors, such as colored wood stains, can be used in the new process for coloring the bright finished wood fiber boards.
  • colored wood stains the degree of coloration of the wood fiber boards can be adjusted by the duration of action and the concentration of the wood stain.
  • the dyes are sensitive to the conditions prevailing in the refiner and / or in this subsequent aggregates, it may also be useful to apply the dyes later on the wood fibers, for example by being sprayed on.
  • a common form in which bleached pulp is traded are bales of dried and more or less strongly pressed pulp, in this form the pulp has a comparatively low transport weight and volume as well as good handleability.
  • the pulp is fed to the refiner in the form of broken and wet adjusted Faseratoffballen.
  • bleached pulp If very light to white or very light colored wood fiber boards are to be produced, a part of the bleached pulp can be replaced by bleached cellulose, which is also readily available in sufficient quantities.
  • the wood fibers can be glued with the binder in a blown duct between a refiner and a dryer of a wood fiber board production line.
  • the binder can be an isocyanate-containing binder, in particular a PMDI binder. Also urea-formaldehyde glues (reinforced or unreinforced) are basically suitable as binders in the new process. Binder with negative Effects on the dyes and / or pronounced inherent color, such as phenolic resin, are less preferred.
  • the new process starts from bleached pulp 1 as starting material containing wood fibers.
  • the bleached pulp 1 is fiber bundles mechanically abraded from solid wood and individual wood fibers that have been bleached chemically with an oxidizing agent such as hydrogen peroxide or bisulfite to a light, almost white color.
  • the bleached pulp is fed to a storage container 3 in the form of broken, ie coarsely crushed commercial pulp bales.
  • dye 2 can be supplied to the storage tank, which are mixed in the storage tank 3 with the pulp 1.
  • the dyes 2 have a composition depending on the desired color of the final product of the process, the feed tank 3 can also be supplied with water to mix the pulp 1 and the dyes 2 in a humid environment or to adjust the Feuchtigkelt the pulp 1.
  • From the storage tank 3 out of the pulp 1 with the dyes 2 is fed to a refiner 4, The refiner 4 is used in a wood fiber board manufacturing plant typically to unlock woodchips into individual wood fibers. A digestion into individual wood fibers is not or at least not necessary to the same extent in the new method, because the pulp 1 already has largely isolated wood fibers.
  • the refiner 4 is used as part of an existing wood fiber board manufacturing facility and allows conditioning of the wood fibers as well as further exposure of the color pigments 2 to the wood fibers.
  • an oxide dope for additionally bleaching the wood fibers may be added in the refiner 4.
  • the wood fibers pass out of the refiner 4 into a blown duct 5, in which they are glued with a binder, here a PMDI binder, which is sprayed onto the wood fibers in aqueous suspension. Subsequently, the glued wood fibers enter a dryer 7, in which the fiber moisture of the wood fibers, as required for further processing, is set.
  • a mat is formed in a matte forming station 8 from the set in their fiber moisture glued dyed wood fibers, which is then hot-pressed in a hot press 9 to the desired wound fiber board 10.
  • the binder 6 hardens.
  • the wood fiber board 10 may be readily colored in light colors, such as pastel colors, because the starting material, ie the bleached pulp 1, does not have a strong intrinsic color and also the binder 6 does not possess such a strong intrinsic color. It is understood that on the one hand, the temperature in the hot press 9 may not be so high that an unintentional color change occurs by the temperatures prevailing here, and on the other hand, the dyes 2 are not decomposed at the unavoidable temperatures occurring in the hot press 9.

Abstract

Production of wood fiber board comprises feeding bleached fiber (1) as starting material containing wood fibers to a refiner (4) outside of the production plant. Preferred Features: The fiber consists of fiber bundles mechanically abraded from solid wood and single wood fibers. The fiber is chemically bleached with an oxidant which is added to the wood fibers in the refiner. Dyes (2) are added to the wood fibers.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Holzfaserplatten mit den Merkmalen des Oberbegriff des Patentanspruchs 1.The invention relates to a method for the production of wood fiber boards with the features of the preamble of claim 1.

STAND DER TECHNIKSTATE OF THE ART

Bei einem herkömmlichen Verfahren zur Herstellung von Holzfaserplatten werden Holzhackschnitzel einem Refiner zugeführt werden, in dem sie in wasserfeuchter Atmosphäre bei erhöhtem Druck und erhöhter Temperatur in die einzelnen Holzfasern zerfasert werden. Beim Austragen der Holzfasern aus dem Refiner wird der Druck in dem Refiner entspannt, wodurch die Holzfasern in dem entstehenden Wasserdampf vereinzelt worden. Der aus dem Refiner austretende aus in dem Wasserdampf suspendierten Holzfasern wird von einem Blasgang aufgenommen. In dem Blasgang erfolgt eine Beleimung der Holzfasern durch Aufsprühen von Bindemittel, beispielsweise einem isozyanathaltigen Bindemittel, auf die Holzfasern. Anschließend treten die Holzfasern aus dem Blasgang in einen Trockner ein, in den die Faserfeuchte der beleimten Holzfasern eingestellt wird. Die beleimten und in ihrer Faserfeuchte eingestellten Holzfasern werden zu Matten als Vorform für die gewünschten Faserplatten gestreut. Diese Matten werden in einer kontinuierlich arbeitenden oder einer Etagenpresse unter erhöhter Temperatur zu den Faserplatten verpresst. Aufgrund der erhöhten Temperatur härtet dabei das Bindemittel aus und verbindet die einzelnen Holzfasern dauerhaft miteinander.In a conventional process for the production of wood fiber boards wood chips are fed to a refiner, where they are shredded in a water-moist atmosphere at elevated pressure and elevated temperature in the individual wood fibers. When discharging the wood fibers from the refiner, the pressure in the refiner is released, whereby the wood fibers have been separated in the resulting water vapor. The emerging from the refiner from suspended in the water vapor wood fibers is absorbed by a blowing passage. In the blowing process, the wood fibers are glued by spraying binder, for example an isocyanate-containing binder, onto the wood fibers. Subsequently, the wood fibers from the blown passage enter a dryer into which the fiber moisture of the glued wood fibers is adjusted. The glued and set in their fiber moisture wood fibers are scattered into mats as a preform for the desired fiberboard. These mats are pressed in a continuous or a platen press under elevated temperature to the fiberboard. Due to the increased temperature, the binder hardens and permanently bonds the individual wood fibers together.

Holzfaserplatten sind in der Vergangenheit seiten ohne eine Lackierung oder eine anderweitige Oberftachenbeschiehtung eingesetzt worden, die die natürliche Farbe der Holzfaserplatten, ein typischerweise dunkles Braun, vollständig überdeckte. Es besteht Jedoch eine jüngere Tendenz, Faserplatten ohne eine blickdichte Beschichtung zu verwenden und stattdessen die Faserplatten selbst einzufärben. Ein Beispiel hierfür beschreibt die DE 20 2004 014 293 U . Insbesondere bei Verwendung von isozyanathaltigem Bindemittel ist es möglich, durch Zugabe von Farbpigmenten zu den Holzhackschnitzeln, die dem Refiner zugeführt werden, schwarze, dunkelgrüne oder andere dunkelfarbige Holzfaserplatten herzustellen, Dabei müssen die Farbpigmente in einer solchen Konzentration eingesetzt werden, dass sie die typischerweise dunkelbraune Grundfarbe der Holzfaserplatten übertönen. In hellen Farben eingefärbte Holzfaserplatten sind auf diese Weise nicht herstellbar, Etwas hellere Farben wären zwar realisierbar, soweit auf Holzhackschnitzeln aus hellen Hölzern wie Birke oder Pappel zurückgegriffen würde, Birken- und Pappelholz ist aber einerseits nicht zu den gewünschten kostengünstigen Konditionen verfügbar und verlangt überdies andererseits eine erhebliche Modifikation des Betriebs harkömmlicher Holzfaserplattenherstellungsanlagen, die typischerweise für die Herstellung von Holzfaserplatten auf der Basis von Nadelhölzern oder Buchenholz ausgelegt sind. Sehr helle oder hell eingefärbte Faserplatten wären auch aus Birken- oder Pappelholz nicht herstellbar.Wood fiber boards have been used in the past without painting or otherwise covering the surface, which completely covered the natural color of the wood panels, typically dark brown. However, there is a younger tendency To use fiberboard without an opaque coating and instead to color the fiberboard itself. An example of this describes the DE 20 2004 014 293 U , In particular, when using isocyanate-containing binder, it is possible to produce black, dark green or other dark-colored wood fiber boards by adding color pigments to the wood chips, which are fed to the refiner, the color pigments must be used in such a concentration that they have the typical dark brown base color drown out the wood fiber boards. In light colors dyed wood fiber boards are not produced in this way, Somewhat lighter colors would indeed be feasible, as far as wood chips from light woods such as birch or poplar would be used, birch and poplar wood, however, on the one hand not available for the desired low-cost conditions and also requires the other a significant modification of the operation of conventional wood fiber board manufacturing equipment, which is typically designed for the production of wood fiber boards based on coniferous or beech wood. Very bright or brightly colored fiberboard would not be made of birch or poplar wood.

Ein Verfahren mit den Merkmalen des Oberbegriffs des Patentanspruchs 1 ist aus der DE 10 2004 050 278 A1 bekannt. Bei dem bekannten Verfahren, das zur Stellung heller bis weißer Holzfaserplatten angewandt wird, werden Holzhackschnitzel in dem einen Refiner vorgeschalteten Kocher mit Oxidationsmittel behandelt, um die in ihnen enthaltenen Holzfasern zu bleichen. Die Holzhackschnitzel werden dann durch den Refiner zerfasert und in üblicher Weise weiterverarbeitet. Diese Vorgehenswelse ist mit verschiedenen nachteilen verbunden. Das Oxidationsmittel wirkt auf die Gesamtheit der Holzfasern in den Holzhackschnitzeln nur über sehr lange Zeiträume ein, wenn überhaupt alle Holzfasern von dem Oxidationsmittel erreicht werden. Dies spricht dagegen, dass bei der Anwendung des bekannten Verfahrens auf einer herkömmlichen Holzfaserplattenherstellungsanlage deren üblicher Durchsatz aufrechterhalten werden kann. Der Durchsatz einer Holzfaserplattenherstellungsanlage stellt aber einen erheblichen kostenrelevanten Faktor dar. Überdies sind die Kocher herkömmlicher Holzfaserplattenherstellungsanlagen nicht für den Einsatz von Oxidationsmitteln und den mit ihnen verbundenen aggressiven chemischen Bedingungen ausgelegt. Dabei ist zu berücksichtigen, dass in einem Kocher erhöhter Druck und erhöhte Temperatur herrschen, die die Aggressivität der Oxidationsmittel erhöhen.A method having the features of the preamble of claim 1 is known from DE 10 2004 050 278 A1 known. In the known method, which is applied to the position of light to white wood fiber boards, wood chips are treated in the upstream of a refiner cooker with oxidizing agent to bleach the wood fibers contained in them. The woodchips are then shredded by the refiner and further processed in the usual way. This approach is associated with various disadvantages. The oxidizing agent acts on the entirety of the wood fibers in the wood chips only over very long periods of time, if any wood fibers are ever reached by the oxidizing agent. This speaks against the fact that in the application of the known method on a conventional wood fiber board manufacturing plant their usual throughput can be maintained. However, the throughput of a wood fiber board manufacturing plant represents a significant cost-relevant factor. Moreover, the stoves conventional wood fiber board manufacturing plants are not designed for the use of oxidizing agents and their associated aggressive chemical conditions. It should be noted that in a cooker increased pressure and elevated temperature prevail, which increase the aggressiveness of the oxidizing agent.

in der DE 10 2004 050 278 A1 wird auch die Verwendung Holzfasern enthaltendem Faserstoff (Holzstoff) für die Herstellung von Faserplatten im Labormaßstab beschrieben. Hierzu wird zunächst der Faserstoff in flüssiger Suspension gebleicht und anschließend wieder getrocknet. Die derart gebleichten Holzfasern werden in einem Schaufelmischer durchmischt und mit einem Bindemittel besprüht. Die beleimten Holzfasern werden dann zu einer Matte geschüttelt, kalt vorverdichtet und heiß zu einer Holzfaserplatte verpresst. Eine Umsetzung dieser Vorgehensweise im industriellen Maßstab ist in der De 10 2004 050 278 A1 weder detailliert beschrieben noch überhaupt angesprochen.in the DE 10 2004 050 278 A1 The use of wood fiber-containing pulp (pulp) for the production of fibreboard on a laboratory scale is also described. For this purpose, the pulp is first bleached in liquid suspension and then dried again. The thus bleached wood fibers are mixed in a paddle mixer and sprayed with a binder. The glued wood fibers are then shaken to a mat, cold precompressed and pressed hot to a fiberboard. An implementation of this procedure on an industrial scale is in the De 10 2004 050 278 A1 neither described in detail nor addressed at all.

AUFGABE DER ERFINDUNGOBJECT OF THE INVENTION

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren mit den Merkmalen des Oberbegriffs des Patentanspruchs 1 aufzuzeigen, das für die Herstellung von hellfarbigen oder in hellen Farben eingefärbten Holzfaserplatten ohne Rückgriff auf helle Holzarten auf einer herkömmlichen Faserplattenherstellungsanlage geeignet ist.The invention has for its object to provide a method having the features of the preamble of claim 1, which is suitable for the production of light-colored or dyed in bright colors wood fiber boards without resorting to light wood species on a conventional fiberboard manufacturing plant.

LÖSUNGSOLUTION

Erfindungsgemäß wird diese Aufgabe durch ein Verfahren zur Herstellung von Holzfaserplatten mit den Merkmalen des unabhängigen Patentanspruchs 1 gelöst. Bevorzugte Ausführungsformen des neuen Verfahrens sind in den abhängigen Patentansprüchen 2 bis 9 beschrieben.According to the invention this object is achieved by a method for the production of wood fiber boards with the features of independent claim 1. Preferred embodiments of the new method are described in the dependent claims 2 to 9.

BESCHREIBUNG DER ERFINDUNGDESCRIPTION OF THE INVENTION

Bei dem neuen Verfahren zur Herstellung von Holzfaserplatten wird als das Holzfasern enthaltendes Ausgangsmaterial, das dem Refiner einer Holzfaserplattenherstellungsanlage zugeführt wird und aus dem die Holzfasern aufbereitet werden, bereits außerhalb der Holzfaserplattenherstellungsanlage gebleichter Faserstoff verwendet.In the new method of producing wood fiber boards, as the wood fiber-containing raw material supplied to the refiner of a wood fiber board manufacturing facility and from which the wood fibers are processed, bleached pulp is already used outside the wood fiber board manufacturing line.

Holzfasern enthaltender Faserstoff wird durch mechanische Aufschlussverfahren aus Vollholz gewonnen. Dabei werden Faserbündel und einzelne Holzfasern von dem Vollholz abgerieben. Man spricht daher auch von Holzschliff. Der Schliff kann durch erhöhte Temperatur (gegebenenfalls in Verbindung mit erhöhtern Druck) und/oder den Zusatz von Chemikalien unterstützt werden. Zudem können unterschiedliche Schleifvorrichtungen eingesetzt werden. Je nach den genauen Umständen des Schliffs spricht man von Steinschliff, Drucksteinochliff, Refinerschliff, thermomechanischem Schliff, cherno-mechanischem Schliff und chemothermornochanischem Schliff, wobei auf einen Schliff auch mehrere dieser Begriffe zutreffen können. Faserstoff, womit in dieser Beschreibung immer Holzfasern enthaltender Faserstoff gemeint ist, ist auch unter seiner englischen Bezeichnung "ground wood" in großen Mengen kommerziell verfügbar und wird beispielsweise als kostengünstiger Grundstoff für die Herstellung von Packpapier verwendet. Auch gebleichter Faserstoff, womit in dieser Beschreibung nur gemeint ist, dass der Faserstoff in erheblichem Umfang gebleicht ist, aber nicht auf eine bestimmte Handelsklasse für Faserstoff abgestellt wird, ist kommerziell in großen Mengen verfügbar. Gebleichter Faserstoff wird beispielsweise für die Herstellung heller Packpapiere und insbesondere für die Herstellung von Zeitungspapleren verwendet.Wood fiber-containing pulp is obtained by mechanical pulping of solid wood. This fiber bundles and individual wood fibers are rubbed off the solid wood. One therefore speaks of wood pulp. The grinding may be due to increased temperature (possibly in conjunction with increased pressure) and / or the addition of chemicals get supported. In addition, different grinding devices can be used. Depending on the exact circumstances of the cut, we speak of stone grinding, Drucksteinochliff, Refinerschliff, thermomechanical grinding, cherno-mechanical grinding and chemothermornochanischem grinding, with a cut can also apply several of these terms. Pulp, which in this description always refers to wood fiber-containing pulp, is also commercially available under its English name "ground wood" in large quantities and is used, for example, as a cost-effective raw material for the production of packaging paper. Also, bleached pulp, which in this specification only means that the pulp is bleached to a significant degree, but is not limited to a particular grade of pulp, is commercially available in large quantities. Bleached pulp is used, for example, for the manufacture of bright packaging papers and in particular for the production of newsprint.

Überraschenderweise hat sich herausgestellt, dass Faserstoff und auch gebleichter Faserstoff als Ausgangsmaterial bei der Herstellung von Holzfaserplatten auf herkömmlichen Holzfaserplattenherstellungsanlagen hervorragend geeignet ist und bei Einhaltung entsprechender Qualität, d. h. Zusammensetzung der in dem Faserstoff enthaltenen Holzfasern, die aber angesichts des Angebots am Markt kein Problem ist, zu hochwertigen Holzfaserplatten führt. Der Faserstoff durchläuft insbesondere problemlos den Refiner herkömmlicher Holzfaserplattenherstellungsanlagen, obwohl die in einem Refiner erfolgende mechanische Zerfaserung bei ihm bereits früher erfolgt ist und ohne dass die Holzfasern dabei zu stark in ihrer Größe reduziert würden.Surprisingly, it has been found that pulp and also bleached pulp is excellently suitable as a starting material in the production of wood fiber boards on conventional wood fiber board production plants and, while maintaining appropriate quality, d. H. Composition of the wood fibers contained in the pulp, but in view of the supply on the market is no problem, leading to high-quality wood fiber boards. The pulp, in particular, easily passes through the refiner of conventional wood fiber board production plants, although the mechanical defibration taking place in a refiner has already occurred earlier and without the wood fibers being excessively reduced in size.

Bei der Herstellung üblicher Holzfaserplatten ohne besondere Farbanforderung macht der Einsatz von Faserstoff aus Kostengründen zwar dennoch keinen Sinn, da die Aufbereitung von Holzfasern aus Holzhackschnitzeln deutlich günstiger als die Verwendung von Faserstoff ist. Wenn jedoch hellfarbige oder in hellen Farben eingefärbte Holzfaserplatten hergestellt werden sollen, ist der Einsatz von gebleichtem Faserstoff allen absehbaren Alternativen überlegen. Dies gilt nicht nur in Bezug auf die bereits oben angesprochene Verwendung heller Holzarten wie Birke oder Pappel, sondern auch in Bezug auf ein mögliches Bleichen der aus den üblichen Holzhackschnitzeln gewonnenen Holzfasern im Rahmen der Aufbereitung der Holzfasern. Das Bleichen von Holz erfolgt unter Einsatz von Oxidationsmitteln wie Wasserstoffperoxid oder Bisulfit, die in einer Holzfaserplattenherstellungsanlage nicht ohne weiteres eingesetzt werden können. Weder sind die dort vorhandenen Apparaturen für den Einsatz solcher Chemikalien geeignet, noch ist es der Wasserhaushalt. Darüber hinaus ist zu bedenken, dass sich das Zusetzen von Farbstoffen, um eingefärbte Holzfaserplatten herzustellen, erst an das Bleichen der Holzfasern anschließen kann, um nicht auch die Farbstoffe zu bleichen.In the production of conventional wood fiber boards without special color requirements, the use of fiber makes for cost reasons, although still no sense, since the treatment of wood fibers from wood chips is much cheaper than the use of pulp. However, if light-colored or light-colored wood fiber boards are to be produced, the use of bleached pulp is superior to any foreseeable alternatives. This applies not only in relation to the above-mentioned use of light wood species such as birch or poplar, but also in terms of a possible bleaching of wood fibers obtained from the usual wood chips in the context of the processing of wood fibers. The bleaching of wood is carried out using oxidizing agents such as hydrogen peroxide or bisulfite, which can not be readily used in a wood fiber board manufacturing plant. Neither are the equipment available there for the use of such chemicals suitable, nor is it the water balance. In addition, it should be remembered that the addition of dyes to produce dyed wood fiberboards may first be followed by bleaching of the wood fibers so as not to bleach the dyestuffs as well.

Wenn hingegen bereits gebleichter Faserstoff als Ausgangsmeterials für das Aufbereiten der Holzfasern eingesetzt wird, muss für das Herstellen hellfarbiger Holzfaserplatten die Betriebsweise einer bestehenden Holzfaserplattenherstellungsanlage kaum verändert werden. Allenfalls wird die Aufbereitung der Holzfasern aus dem Faserstoff, einfacher als bei holzhackschnitzeln, in denen mehr Holzfasern in größeren Aggregaten zusammenhängen und beim Aufbereiten voneinander getrennt werden müssen.If, on the other hand, already bleached pulp is used as the starting material for the preparation of the wood fibers, the operation of an existing wood pulp production plant hardly needs to be changed for the production of light-colored wood fiber boards. At most, the treatment of wood fibers from the pulp, easier than in wood chips, in which more wood fibers in larger aggregates related and must be separated from each other during processing.

Die für das chemische Bleichen von Faserstoff typischerweise eingesetzten Oxidationsmittel gelangen bei dem neuen Verfahren, das von bereits gebleichtem Faserstoff ausgeht, nur noch in nicht mehr relevanten Rückstandsmengen in die Apparaturen und den Wasserkreislauf. Dies gilt auch dann wenn bei den neuen Verfahren zusätzliche Oxidationsmittel eingesetzt werden, um bspw. besonders helle Faserplatten herzustellen. Der Einsatz dieser zusätzlichen Oxidationsmittel erfolgt vorzugsweise im Refiner, in dem die Holzfasern aus dem Faserstoff heraus vereinzeit werden. So können insbesondere erstmalig frei gelegte Oberflächen der Holzfasern gebleicht werden, die noch keinen Verfärbungsreaktionen ausgesetzt waren.The oxidants typically used for the chemical bleaching of pulp arrive in the new process, which emanates from already bleached pulp, only in no longer relevant residues in the equipment and the water cycle. This also applies if additional oxidizing agents are used in the new processes in order to produce, for example, particularly light fiberboard. The use of these additional oxidizing agent is preferably carried out in the refiner, in which the wood fibers are made out of the pulp out. Thus, for the first time in particular exposed surfaces of wood fibers can be bleached, which were not exposed to discoloration reactions.

Mit dem neuen Verfahren können sehr helle bis weiße Holzfaserplatten hergestellt werden, ohne dass hierzu Farbstoffe zugesetzt werden müssen. Unter Verwendung von Farbstoffen können durchgefärbte Faserplatten in hellen Farben hergestellt werden. Für das Zusetzen von Farbstoffen zu dem Faserstoff bestehen bei dem neuen Verfahren keinerlei Einschränkungen. Es muss kein Bleichen des Ausgangsmaterials bzw. der Holzfasern abgewartet worden, bevor die Farbstoffe zugesetzt werden können, Vielmehr können die Farbstoffe dem Faserstoff bereits in einem Vorlagebehälter zugesetzt werden, aus dem der Faserstoff dem Refiner eine Holzfaserplattenherstellungsanlage zugeführt wird. Die Farbstoffe könnten auch dem Refiner separat zugeführt werden. Hierfür sind aber bei einer üblichen Halzfaserplattenherstellungsanlage keine entsprechenden Einrichtungen vorhanden. Es ist daher bevorzugt, die Farbstoffe dem Faserstoff schon vor dem oder erst nach dem Refiner zuzusetzen. Wenn die Farbstoffe bereits vor dem Refiner zugesetzt werden, haben sie damit auch eine maximale Zeit, sich gleichmäßig an die Holzfasern anzulagern. Auch insofern ist die Verwendung von Holzfasern statt gröberer Holzhackschnitzel ein Vorteil, well die Farbstoffe zunächst immer nur die Holzfasern an der Oberfläche des Ausgangsmatedais erreichen können, und bei Holzhackschnitzeln ein ganz erheblicher Anteil der Holzfaser unterhalb der jeweiligen Teilchenoberfläche liegt und daher für die Farbstoffe zunächst nicht erreichbar ist,With the new process, very light to white wood fiber boards can be produced without having to add dyes. By using dyestuffs, dyed fiber boards can be produced in bright colors. For the addition of dyes to the pulp there are no limitations in the new process. It is not necessary to wait for the starting material or the wood fibers to bleach before the dyes can be added. Rather, the dyes can already be added to the pulp in a storage container from which the pulp is fed to the refiner with a wood fiber board production facility. The dyes could also be fed to the refiner separately. For this, however, no corresponding facilities are available in a conventional Halzfaserplattenherstellungsanlage. It is therefore preferred to add the dyes to the pulp before or after the refiner. If the dyes are added before the refiner, they also have a maximum time to evenly attach to the wood fibers. Also in this respect, the use of wood fibers instead of coarser wood chips is an advantage, because the dyes only ever the wood fibers can reach the surface of the Ausgangsmatedais, and in woodchips a very significant proportion of wood fiber below the respective particle surface and therefore is initially unavailable for the dyes,

Bei den Farbstoffen die bei dem neuen Verfahren den Holzfasern zugesetzt werden handelt es sich in aller Regel um Dispersionsfarbstoffe auf der Basis von Farbpigmenten. Diese besitzen eine hohe Licht- und Temperaturbeständigkeit. Organische Farben, wie beispielsweise farbige Holzbeizen, können bei dem neuen Verfahren zur Einfärbung der hellen fertigen Holzfaserplatten verwendet werden. Beim Einsatz von farbigen Holzbeizen kann durch die Einwirkdauer und die Konzentration der Holzbeize der Einfärbungsgrad der Holzfaserplatten eingestellt werden.The dyes added to the wood fibers in the new process are generally disperse dyes based on color pigments. These have a high light and temperature resistance. Organic colors, such as colored wood stains, can be used in the new process for coloring the bright finished wood fiber boards. When using colored wood stains, the degree of coloration of the wood fiber boards can be adjusted by the duration of action and the concentration of the wood stain.

Wenn die Farbstoffe empfindlich gegenüber den in dem Refiner und/oder in diesem nachgeschalteten Aggregaten herrschenden Bedingungen sind, kann es auch sinnvoll sein, die Farbstoffe erst später auf die Holzfasern aufzubringen, bspw. indem Sie aufgesprüht werden.If the dyes are sensitive to the conditions prevailing in the refiner and / or in this subsequent aggregates, it may also be useful to apply the dyes later on the wood fibers, for example by being sprayed on.

Eine übliche Form, in der gebleichter Faserstoff gehandelt wird, sind Ballen aus getrocknetem und mehr oder weniger stark gepresstem Faserstoff, in dieser Form weißt der Faserstoff ein vergleichsweise geringes Transportgewicht und -volumen sowie eine gute Handhabbarkeit auf. Bei Verwendung von Faserstoffballen, wird der Faserstoff dem Refiner in Form aufgebrochener und feucht eingestellter Faseratoffballen zugeführt.A common form in which bleached pulp is traded are bales of dried and more or less strongly pressed pulp, in this form the pulp has a comparatively low transport weight and volume as well as good handleability. When using pulp bales, the pulp is fed to the refiner in the form of broken and wet adjusted Faseratoffballen.

Wenn sehr helle bis weiße oder sehr hell eingefärbte Holzfaserplatten hergestellt werden sollen, kann ein Teil des gebleichten Faserstoffs durch gebleichte Cellulose ersetzt werden, die ebenfalls in ausreichenden Mengen problemlos verfügbar ist.If very light to white or very light colored wood fiber boards are to be produced, a part of the bleached pulp can be replaced by bleached cellulose, which is also readily available in sufficient quantities.

Wie in einer üblichen Holzfaserplattenherstellungsanlage können auch bei dem neuen Verfahren die Holzfasern in einem Blasgang zwischen einem Refiner und einem Trockner einer Holzfaserplattenherstellungsanlage mit dem Bindemittel beleimt werden.As in a conventional wood fiber board manufacturing plant, even in the new process, the wood fibers can be glued with the binder in a blown duct between a refiner and a dryer of a wood fiber board production line.

Bei dem Bindemittel kann es sich um ein isozyanathaltiges Bindemittel, insbesondere ein PMDI-Bindemittel handeln. Auch Harnstoff-Formaldehyd-Leime (verstärkt oder unverstärkt) sind grundsätzlich als Bindemittel bei dem neuen Verfahren geeignet. Bindemittel mit negativen Auswirkungen auf die Farbstoffe und/oder ausgeprägter Eigenfarbe, wie beispielsweise bei Phenolharz, sind weniger bevorzugt.The binder can be an isocyanate-containing binder, in particular a PMDI binder. Also urea-formaldehyde glues (reinforced or unreinforced) are basically suitable as binders in the new process. Binder with negative Effects on the dyes and / or pronounced inherent color, such as phenolic resin, are less preferred.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Patentansprüchen, der Beschreibung und den Zeichnungen. Die in der Beschreibungseinleitung genannten Vorteile von Merkmalen und von Kombinationen mehrerer Merkmale sind lediglich beispielhaft und können alternativ oder kumulativ zur Wirkung kommen, ohne dass die Vorteile zwingend von erfindungsgemäßen Ausführungsformen, erzielt werden müssen. Weitere Merkmale sind den Zeichnungen - insbesondere den dargestellten Geometrien und den relativen Abmessungen mehrerer Bauteile zueinander sowie deren relativer Anordnung und Wirkverbindung - zu entnehmen. Die Kombination von Merkmalen unterschiedlicher Ausführungsformen der Erfindung oder von Merkmalen unterschiedlicher Patentansprüche ist ebenfalls abweichend von den gewählten Rückbeziehungen der Patentansprüche möglich und wird hiermit angeregt. Dies betrifft auch solche Merkmale, die in separaten Zeichnungen dargestellt sind oder bei deren Beschreibung genannt werden. Diese Merkmale können auch mit Merkmalen unterschiedlicher Patentansprüche kombiniert werden. Ebenso können in den Patentansprüchen aufgeführte Merkmale für weitere Ausführungsformen der Erfindung entfallen.Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the introduction to the description are merely exemplary and may be effective as an alternative or cumulatively without the advantages of embodiments according to the invention having to be achieved. Further features are the drawings - in particular the illustrated geometries and the relative dimensions of several components to each other and their relative arrangement and operative connection - refer. The combination of features of different embodiments of the invention or of features of different claims is also possible deviating from the chosen relationships of the claims and is hereby stimulated. This also applies to those features which are shown in separate drawings or are mentioned in their description. These features can also be combined with features of different claims. Likewise, in the claims listed features for further embodiments of the invention can be omitted.

KURZBESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Im Folgenden wird die Erfindung unter Bezugnahme auf die beigefügte Zeichnung anhand eines Ausführungsbeispiels näher erläutert und beschrieben.

Fig. 1
zeigt ein Flussdiagramm zur Durchführung des neuen Verfahrens zur Herstellung von eingefärbten Holzfaserplatten.
In the following the invention will be explained and described in more detail with reference to the accompanying drawing with reference to an embodiment.
Fig. 1
shows a flow chart for carrying out the new process for the production of dyed wood fiber boards.

FIGURENBESCHREIBUNGDESCRIPTION OF THE FIGURES

Das neue Verfahren geht von gebleichtem Faserstoff 1 als Holzfasern enthaltendes Ausgangsmaterial aus. Bei dem gebleichten Faserstoff 1 handelt es sich um mechanisch von Vollholz abgeriebene Faserbündel und einzelne Holzfasern, die chemisch mit einem Oxidationsmittel, wie beispielsweise Wasserstoffperoxyd oder Bisulfit auf eine helle, fast weiße Farbe gebleicht wurden. Der gebleichte Faserstoff wird einem Vorlagebehälter 3 in Form von aufgebrochenen, d.h. grob zerkleinerten handelsüblichen Faserstoffballen zugeführt.The new process starts from bleached pulp 1 as starting material containing wood fibers. The bleached pulp 1 is fiber bundles mechanically abraded from solid wood and individual wood fibers that have been bleached chemically with an oxidizing agent such as hydrogen peroxide or bisulfite to a light, almost white color. The bleached pulp is fed to a storage container 3 in the form of broken, ie coarsely crushed commercial pulp bales.

Zusammen mit dem Faserstoff 1 können dem Vorlagebehälter 3 Farbstoffe 2 zugeführt werden, die in dem Vorlagebehälter 3 mit dem Faserstoff 1 vermischt werden. Die Farbstoffe 2 weisen eine Zusammensetzung Je nach der gewünschten Farbe des Endprodukts des Verfahrens auf, Dem Vorlagebehälter 3 kann zusätzlich auch Wasser zugeführt werden, um den Faserstoff 1 und die Farbstoffe 2 in feuchter Umgebung miteinander zu durchmischen oder um die Feuchtigkelt des Faserstoffs 1 einzustellen. Aus dem Vorlagebehälter 3 heraus wird der Faserstoff 1 mit den Farbstoffen 2 einem Refiner 4 zugeführt, Der Refiner 4 dient bei einer Holzfaserplattenherstellungsanlage typischerweise dazu, Holzhackschnitzel in einzelne Holzfasern aufzuschließen. Ein Aufschließen in einzelne Holzfasern ist bei dem neuen Verfahren nicht oder zumindest nicht in demselben Maße notwendig, weil der Faserstoff 1 bereits weitgehend vereinzelte Holzfasern aufweist. Dennoch wird bei dem neuen Verfahren der Refiner 4 als Teil einer vorhandenen Holzfaserplattenherstellungsanlage verwendet und erlaubt eine Konditionierung der Holzfasern ebenso wie ein weiteres Einwirken der Farbpigmente 2 auf die Holzfasern. Auch ein Oxldatlonsmlttel zum zusätzlichen Bleichen der Holzfasern kann in dem Refiner 4 zugesetzt werden. Aus dem Refiner 4 heraus gelangen die Holzfasern in einen Blasgang 5, in dem sie mit einem Bindemittel, hier einem PMDI-Bindemittel, beleimt werden, das in wässriger Suspension auf die Holzfasern aufgesprüht wird. Anschließend gelangen die beleimten Holzfasern in einen Trockner 7, in den die Faserfeuchte der Holzfasern, wie sie für die Weiterverarbeitung erforderlich ist, eingestellt wird. Danach wird in einer Mattanformstation 8 aus den in ihrer Faserfeuchte eingestellten beleimten eingefärbten Holzfasern eine Matte geformt, die dann in einer Heißpresse 9 zu der gewünschten wunden Faserplatte 10 heiß verpresst wird. Bei diesem heißen Verpressen härtet das Bindemittel 6 aus. Die Holzfaserplatte 10 kann ohne weiteres in hellen Farben, wie beispielsweise Pastellfarben, durchgängig eingefärbt sein, weil das Ausgangsmaterial, d. h. der gebleichte Faserstoff 1, keine starke Eigenfärbung aufweist und auch das Bindemittel 6 eine solche starke Eigenfärbung nicht besitzt. Es versteht sich, dass einerseits die Temperatur in der Heißpresse 9 nicht so hoch sein darf, dass durch die hier herrschenden Temperaturen eine ungewollte Farbveränderung eintritt, und dass andererseits auch die Farbstoffe 2 bei den in der Heißpresse 9 unvermeidlich auftretenden Temperaturen nicht zersetzt werden. Dies gilt jedoch für eine Vielzahl handelsüblicher Farbstoffe, insbesondere für eine Veizahl von Dispersionsfarben auf der Basis chemisch inerter Farbpigmente. Die Zugabe der Farbstoffe 2 zu dem Faserstoff 1 bzw. den daraus aufbereiteten Holzfasern kann auch an anderen Stellen als in den Vorlagebehälter 3 hinein erfolgen, beispielsweise in einen noch weiter stromauf liegenden Dämpfbehälter oder auch in den Blasgang 5. Grundsätzlich können bei dem neuen Verfahren aber auch organische Farben, wie beispielsweise farbige Holzbeizen als Farbstoffe eingesetzt werden. Diese werden vorzugsweise verwendet, um bis dahin ohne Farbstoffe hergestellte helle Holzfaserplatten 10 einzufärben. Ganz ohne Farbstoffe nach dem neuen Verfahren hergestellte helle bis weiße Holzfaserplatten 10 sind ebenfalls ein interessantes Produkt, dessen Weißgrad durch Ersatz eines Teils des gebleichten Faserstoffs 1 durch gebleichte Cellulose weiter gesteigert werden kann.Together with the pulp 1 3 dye 2 can be supplied to the storage tank, which are mixed in the storage tank 3 with the pulp 1. The dyes 2 have a composition depending on the desired color of the final product of the process, the feed tank 3 can also be supplied with water to mix the pulp 1 and the dyes 2 in a humid environment or to adjust the Feuchtigkelt the pulp 1. From the storage tank 3 out of the pulp 1 with the dyes 2 is fed to a refiner 4, The refiner 4 is used in a wood fiber board manufacturing plant typically to unlock woodchips into individual wood fibers. A digestion into individual wood fibers is not or at least not necessary to the same extent in the new method, because the pulp 1 already has largely isolated wood fibers. Nevertheless, in the new method, the refiner 4 is used as part of an existing wood fiber board manufacturing facility and allows conditioning of the wood fibers as well as further exposure of the color pigments 2 to the wood fibers. Also, an oxide dope for additionally bleaching the wood fibers may be added in the refiner 4. The wood fibers pass out of the refiner 4 into a blown duct 5, in which they are glued with a binder, here a PMDI binder, which is sprayed onto the wood fibers in aqueous suspension. Subsequently, the glued wood fibers enter a dryer 7, in which the fiber moisture of the wood fibers, as required for further processing, is set. Thereafter, a mat is formed in a matte forming station 8 from the set in their fiber moisture glued dyed wood fibers, which is then hot-pressed in a hot press 9 to the desired wound fiber board 10. In this hot pressing, the binder 6 hardens. The wood fiber board 10 may be readily colored in light colors, such as pastel colors, because the starting material, ie the bleached pulp 1, does not have a strong intrinsic color and also the binder 6 does not possess such a strong intrinsic color. It is understood that on the one hand, the temperature in the hot press 9 may not be so high that an unintentional color change occurs by the temperatures prevailing here, and on the other hand, the dyes 2 are not decomposed at the unavoidable temperatures occurring in the hot press 9. However, this applies to a variety of commercially available dyes, in particular for a Veizahl of emulsion paints based on chemically inert color pigments. The addition of the dyestuffs 2 to the pulp 1 or the wood fibers prepared therefrom can also take place at locations other than in the feed tank 3, for example in an even further upstream steaming tank or in the blown duct 5. Basically, however, in the new process also organic Colors, such as colored wood stains are used as dyes. These are preferably used to color bright wood fiberboards 10 made up to that point without dyes. Bright to white wood fiber boards 10 made entirely without dyes according to the new process are also an interesting product whose whiteness can be further increased by replacing a portion of the bleached pulp 1 with bleached cellulose.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11
Faserstofffiber
22
Farbstoffedyes
33
Vorlagebehälterstorage container
44
Refinerrefiner
55
Blasgangblow line
66
Bindemittelbinder
77
Trocknerdryer
88th
MattonfarmungsstationMattonfarmungsstation
99
Heißpressehot press
1010
HolzfaserplatteFiberboard

Claims (9)

Verfahren zur Herstellung von Holzfaserplatten, wobei einem Refiner einer Holzfaserplattenherstellungsanlage ein Holzfasern enthaltendes Ausgangsmaterial zugeführt wird, um gebleichte Holzfasern aus dem Ausgangsmaterial aufzubereiten, wobei die Holzfasern mit einem Bindemittel beleimt werden, wobei die beleimten Holzfasern zu Matten gestreut werden und wobei die Matten heiß zu den Faserplatten verpresst werden, dadurch gekennzeichnet, dass dem Refiner (4) bereits außerhalb der Holzfaserplattenherstellungsanlage gebleichter Faserstoff (1) als das Holzfasern enthaltende Ausgangsmaterial zugeführt wird.A process for the production of wood fiber boards, wherein a refiner of a wood fiber board production plant, a wood fiber-containing feedstock is fed to prepare bleached wood fibers from the starting material, wherein the wood fibers are glued with a binder, wherein the glued wood fibers are scattered into mats and the mats hot to the Fibrous plates are pressed, characterized in that the refiner (4) already outside the wood fiber board production plant bleached pulp (1) is supplied as the wood fibers containing starting material. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Faserstoff (1) aus mechanisch von Vollholz abgeriebenen Faserbündeln und einzelnen Holzfasern besteht.A method according to claim 1, characterized in that the pulp (1) consists of mechanically abraded from solid wood fiber bundles and individual wood fibers. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Faserstoff (1) mit einem Oxidationsmittel chemisch gebleicht ist.A method according to claim 1 or 2, characterized in that the pulp (1) is chemically bleached with an oxidizing agent. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass ein Oxidationsmittel beim Aufbereiten der Holzfasern in dem Refiner (4) zugesetzt wird.A method according to claim 1, 2 or 3, characterized in that an oxidizing agent is added in the processing of the wood fibers in the refiner (4). Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass den Holzfasern Farbstoffe (2) zugesetzt werden.Method according to one of claims 1 to 4, characterized in that the wood fibers dyes (2) are added. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Farbstoffe den Holzfasern vor oder nach dem Refiner (4) zugesetzt werden.A method according to claim 5, characterized in that the dyes are added to the wood fibers before or after the refiner (4). Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Faserstoff (1) dem Refiner (4) in Form aufgebrochener Faserstoffballen zugeführt wird.Method according to one of claims 1 to 6, characterized in that the pulp (1) is supplied to the refiner (4) in the form of broken pulp bales. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Holzfasern in einem Blasgang (5) zwischen einem Refiner (4) und einem Trockner (7) einer Holzfaserplattenherstellungsanlage mit dem Bindemittel (6) beleimt werden.Method according to one of claims 1 to 7, characterized in that the wood fibers in a blown passage (5) between a refiner (4) and a dryer (7) of a wood fiber board production plant with the binder (6) are glued. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Bindemittel (6) ein isozyanathaltiges Bindemittel, insbesondere ein PMDI-Bindemittel, ist.Method according to one of claims 1 to 8, characterized in that the binder (6) is an isocyanate-containing binder, in particular a PMDI binder.
EP06021519A 2005-10-13 2006-10-13 Method of making brightly coloured fibre boards Not-in-force EP1775086B1 (en)

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DE102009026801A1 (en) 2009-06-05 2010-12-23 Glunz Ag Producing photoluminescent molded body, preferably plate, based on base body exhibiting synthetic resin portion, and made of pigment with photoluminescent properties, comprises introducing the pigment into layer near surface of base body

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EP1775086A3 (en) 2007-08-22
ATE396851T1 (en) 2008-06-15
DE502006000832D1 (en) 2008-07-10
ES2306338T3 (en) 2008-11-01
EP1775086B1 (en) 2008-05-28

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