EP0785053A2 - Process for the continuous production of chip- or fibreboards - Google Patents
Process for the continuous production of chip- or fibreboards Download PDFInfo
- Publication number
- EP0785053A2 EP0785053A2 EP97200068A EP97200068A EP0785053A2 EP 0785053 A2 EP0785053 A2 EP 0785053A2 EP 97200068 A EP97200068 A EP 97200068A EP 97200068 A EP97200068 A EP 97200068A EP 0785053 A2 EP0785053 A2 EP 0785053A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- talc
- pressing
- suspension
- release agent
- chipboard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/083—Agents for facilitating separation of moulds from articles
Definitions
- the invention relates to a process for the continuous production of chipboard or fiberboard from lignocellulose-containing raw materials, the raw materials in chip and / or fiber form being glued with a binder containing NCO groups, shaped into a mat and under the action of heat to the chipboard or Fibreboard are pressed, with an external release agent being applied in particular to the pressing allowances before pressing.
- An external release agent is understood to mean a release agent which is applied either to the press allowances, that is to say the strips, press plates and the like. Like., Is applied before pressing. Another possibility is to apply this external release agent to the two surfaces of the scattered and possibly pre-sealed mat.
- Internal release agents are release agents that are introduced into the interior of the mat, i.e.
- a method of the type described in the opening paragraph is known from GB 1,148,016.
- the pressing allowances are treated with an external release agent.
- Organic substances containing free hydroxyl groups are used as release agents, for example glycerol, ethylene glycol, polyester and polyether.
- Soaps in particular soft soap, are suitable as surface-active substances.
- finely divided fillers are oxides, carbonates, silicates, sulfates, finely divided minerals, e.g. B. also talc, clays, expanded mica, diatomaceous earth etc. are suitable.
- the use of the surface-active substance is essential.
- the desired granular structure of the release agent can also be achieved without using a filler. This reference and the examples given have meant that in practice the use of a filler and the surface-active substance, in particular, have been dispensed with Soft soap, as the actual active ingredient was used alone. This can also be seen in Deppe / Ernst, p. 60.
- soft soap as an external release agent can be used at relatively low pressing temperatures below about 200 ° C.
- press temperatures up to around 250 ° C, however, decomposition takes place, with a well-adhering but difficult-to-remove coating being formed on the press supplements, which grows in an unpleasant manner, particularly in the case of continuously working seizures, since it does not continuously mechanically can be removed.
- This coating deteriorates the heat transfer into the glued chip material, which disadvantageously requires longer pressing times.
- Business interruptions for the mechanical removal of the covering are a necessary consequence. Since the thickness of the covering increases over time, i.e.
- the covering thickness is not constant, it is still necessary to take larger grinding allowances into account, which not only suffers the cost-effectiveness of production, but also complicates the subsequent processing steps.
- the build-up of the covering can ultimately lead to the necessity to use lower pressing temperatures and thus longer pressing cycles.
- the invention has for its object to provide an external release agent in connection with the method described above, which is not only suitable to bring about a clean release effect, but can also be used at higher press temperatures in the range of 250 ° C or above, without Signs of decomposition occur or a disruptive build-up of deposits on the press supplements results.
- this is achieved in the process of the type described at the outset by using talc as a release agent.
- the invention is based on the knowledge that the filler talc known in the prior art for the production of particle board in its sole use, that is to say without surface-active substances, becomes the active substance and so, surprisingly, signs of decomposition and the build-up of hard-to-remove deposits can also be avoided if working with comparatively elevated press temperatures.
- the invention further avoids the use of an organic release agent and uses the inexpensive mineral talc as an active ingredient in an economical manner.
- Talc is also unproblematic in its use from an environmental point of view. It even allows its continuous use without the build-up of a covering.
- the press supplements are also continuously cleaned. This known continuous cleaning, which is present anyway, is completely sufficient to keep the pressing supplements clean.
- the talc can be applied in a customary manner, for example by sprinkling, spraying, rolling up or the like.
- the talc thus reaches the pressing supplements, including on the one hand the various pressing tools such as sheets, plates, strips or the like and on the other hand also Means of transport for the glued raw material, in particular the tapes, rollers, rolls u. Like. To be understood.
- the talc is applied to the pressing additives in the form of an aqueous suspension.
- This suspension of talc in water enables easy preparation and handling of the suspension.
- the advantages lie in economical consumption, while at the same time the pressing supplements are evenly covered. Any dust formation is avoided during use. Sufficient liability arises for the press supplements.
- the temperature evaporates the water during the pressing, advantageously reducing the adhesion of the talc to the pressing additives and at the same time maintaining the separating effect.
- the use of talc in the form of the suspension has no adverse effects on the other process steps in the production of such chipboard or fiberboard.
- the other conditions of the manufacturing process can remain unchanged.
- the known binders containing NCO groups in particular polymeric diphenylmethane diisocyanate (PMDI), used alone or in admixture with polyols, can also be used advantageously, unchanged.
- Such binders are also referred to as polyurethane binders (PUR) due to the reaction with the hydroxyl groups of the wood.
- the talc can be used in a proportion of approximately 5 to 40% by weight, preferably approximately 20% by weight, based on the total weight of the suspension. This also ensures economical use, which has a double effect with regard to the already inexpensive release agent. A suspension defined with these proportions has sufficient stability, is easy to handle and provides an excellent separation effect. At high degrees of gluing, a comparatively higher proportion by weight of talc in the suspension will also be selected.
- the suspension is kept in motion during application and thus a foam is formed which enables the talcum to be applied evenly to the pressing additives. This not only prevents signs of settling, but the foam is used as a means of transport and as a distributor in order to achieve even application to the pressing allowances. Foam formation on the suspension is achieved by stirring or pumping.
- talc as an external release agent in conjunction with a continuous pressing of a particle board or fiber board bound with a binder containing NCO groups. Then it is possible to apply the suspension continuously to the pressing supplements and to continuously clean the pressing supplements using known cleaning devices.
- An aqueous suspension of talc is prepared by combining several batches into one batch. For each batch, 40 kg of water at a temperature of about 20 ° C. are introduced and 10 kg of talc are added. The talc is added in 5 portions of 2 kg one after the other. The talc has a grain size of 30 ⁇ m. The portions are introduced into the water using a high-speed mixer. Then 20 such batches of 50 kg each are combined to form the batch.
- An aqueous suspension of talc is prepared by combining several batches into one batch. For each batch, 160 kg of water at a temperature of about 25 ° C. are introduced and 40 kg of talc are added. The talc is added in 5 portions of 8 kg one after the other. The talc has a grain size of 20 ⁇ m. The portions are introduced into the water using a high-speed mixer. Then 5 such batches of 200 kg each are combined to form the batch.
- An aqueous suspension of talc is prepared in one batch by introducing 700 kg of water at a temperature of about 50 ° C. and adding 300 kg of talc.
- the talc is added in 6 portions of 50 kg one after the other.
- the talc has a grain size of 10 ⁇ m. The portions are introduced into the water using a paddle stirrer. The paddle stirrer is driven at the highest possible speed.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur kontinuierlichen Herstellung von Span- oder Faserplatten aus lignocellulosehaltigen Rohstoffen, wobei die Rohstoffe in Span- und/oder Faserform mit einem NCO-Gruppen aufweisenden Bindemittel beleimt, zu einer Matte geformt und unter Einwirkung von Wärme zu der Span- oder Faserplatte verpreßt werden, wobei ein äußeres Trennmittel insbesondere auf den Preßzulagen vor der Verpressung aufgebracht wird. Unter einem äußeren Trennmittel wird ein Trennmittel verstanden, welches entweder auf die Preßzulagen, also die Bänder, Preßbleche u. dgl., vor dem Verpressen aufgebracht wird. Eine andere Möglichkeit besteht darin, dieses äußere Trennmittel auf die beiden Oberflächen der gestreuten und ggfs. vorgedichteten Matte aufzubringen. Innere Trennmittel sind dagegen Trennmittel, die in das Innere der Matte eingebracht werden, also dem gesamten Späne- und/oder Fasermaterial z. B. im Anschluß an die Beleimung hinzugefügt werden. Die Verwendung dieser beiden Trennmittelarten ist aus Deppe/Ernst "Taschenbuch der Spanplattentechnik", 3. Auflage 1991, S. 60, bekannt.The invention relates to a process for the continuous production of chipboard or fiberboard from lignocellulose-containing raw materials, the raw materials in chip and / or fiber form being glued with a binder containing NCO groups, shaped into a mat and under the action of heat to the chipboard or Fibreboard are pressed, with an external release agent being applied in particular to the pressing allowances before pressing. An external release agent is understood to mean a release agent which is applied either to the press allowances, that is to say the strips, press plates and the like. Like., Is applied before pressing. Another possibility is to apply this external release agent to the two surfaces of the scattered and possibly pre-sealed mat. Internal release agents, on the other hand, are release agents that are introduced into the interior of the mat, i.e. the entire chip and / or fiber material z. B. can be added after the gluing. The use of these two types of release agent is known from Deppe / Ernst "Taschenbuch der Spanplattenentechnik", 3rd edition 1991, p. 60.
Ein Verfahren der eingangs beschriebenen Art ist aus der GB 1,148,016 bekannt. Die Preßzulagen werden mit einem äußeren Trennmittel behandelt. Als Trennmittel werden organische Substanzen, die freie Hydroxylgruppen enthalten, eingesetzt, beispielsweise Glycerin, Äthylenglykol, Polyester und Polyäther.A method of the type described in the opening paragraph is known from GB 1,148,016. The pressing allowances are treated with an external release agent. Organic substances containing free hydroxyl groups are used as release agents, for example glycerol, ethylene glycol, polyester and polyether.
Aus der DE-OS 26 47 488 ist ein Verfahren zur Verbesserung des Entformungsvorganges bei der Herstellung von Spanplatten oder - formteilen durch Verpressen der Rohstoffe mit einem NCO-Gruppen aufweisenden Bindemittel bekannt, wobei auf die Preßzulagen vor dem Einbringen bzw. Aufbringen der beleimten Späne eine bei Preßtemperatur im wesentlichen nicht flüchtige Substanz, ggfs. in Form einer Lösung oder Dispersion, aufgebracht wird, die bei der Preßtemperatur eine aus diskreten Partikeln bestehende haftfähige Schicht hinterläßt. Dieses äußere Trennmittel, welches eine aus diskreten Partikeln bestehende, haftfähige Schicht hinterläßt, besteht mindestens aus zwei Bestandteilen, nämlich einer nicht-flüchtigen, oberflächenaktiven Substanz und einem feinteiligen Füllstoff. Hinzu kommt im allgemeinen ein Lösungs- bzw. Dispergiermittel, falls die oberflächenaktive Substanz nicht ohnehin flüssig ist. Als oberflächenaktive Substanz kommen Seifen, insbesondere Schmierseife, in Betracht. Als feinteilige Füllstoffe sind Oxide, Carbonate, Silikate, Sulfate, feinteilige Minerale, z. B. auch Talkum, Tone, Blähglimmer, Kieselgur usw. geeignet. Wesentlich ist jedoch die Verwendung der oberflächenaktiven Substanz. Die gewünschte körnige Struktur des Trennmittels läßt sich auch ohne Verwendung eines Füllstoffes erzielen. Dieser Hinweis sowie die gegebenen Beispiele haben bewirkt, daß in der Praxis auf die Verwendung eines Füllstoffes verzichtet wurde und die oberflächenaktive Substanz, insbesondere Schmierseife, als eigentlicher Wirkstoff allein eingesetzt wurde. Dies geht auch aus Deppe/Ernst, S. 60, hervor.From DE-OS 26 47 488 a method for improving the demolding process in the production of chipboard or - molded parts by pressing the raw materials with a binder containing NCO groups is known, with a pressing allowance before the introduction or application of the glued chips at the pressing temperature essentially non-volatile substance, possibly in the form of a solution or dispersion, is applied which leaves an adhesive layer consisting of discrete particles at the pressing temperature. This external release agent, which leaves an adhesive layer consisting of discrete particles, consists of at least two components, namely a non-volatile, surface-active substance and a finely divided filler. In addition, there is generally a solvent or dispersant if the surface-active substance is not already liquid. Soaps, in particular soft soap, are suitable as surface-active substances. As finely divided fillers are oxides, carbonates, silicates, sulfates, finely divided minerals, e.g. B. also talc, clays, expanded mica, diatomaceous earth etc. are suitable. However, the use of the surface-active substance is essential. The desired granular structure of the release agent can also be achieved without using a filler. This reference and the examples given have meant that in practice the use of a filler and the surface-active substance, in particular, have been dispensed with Soft soap, as the actual active ingredient was used alone. This can also be seen in Deppe / Ernst, p. 60.
Die Verwendung von Schmierseife als äußeres Trennmittel ist bei relativ niedrigen Preßtemperaturen unter etwa 200°C anwendbar. Bei höheren Preßtemperaturen bis in den Bereich von etwa 250°C findet jedoch eine Zersetzung statt, wobei sich auf den Preßzulagen ein gut haftender, jedoch schwierig entfernbarer Belag bildet, der insbesondere bei kontinuierlich arbeitenden Fressen in unangenehmer Weise anwächst, da er sich kontinuierlich mechanisch nicht entfernen läßt. Dieser Belag verschlechtert den Wärmedurchgang in das beleimte Spanmaterial, was in nachteiliger Weise längere Preßzeiten erfordert. Betriebsunterbrechungen zum mechanischen Entfernen des Belages sind eine notwendige Folge. Da die Dicke des Belages mit der Zeit zunimmt, also die Belagsdicke nicht konstant ist, ist es weiterhin erforderlich, größere Schleifzulagen zu berücksichtigen, worunter nicht nur die Wirtschaftlichkeit der Herstellung leidet, sondern sich auch die nachfolgenden Bearbeitungsschritte verkomplizieren. Der Belagsaufbau kann schließlich dazu führen, zwangsweise niedrigere Preßtemperaturen und damit verlängerte Preßzyklen anwenden zu müssen.The use of soft soap as an external release agent can be used at relatively low pressing temperatures below about 200 ° C. At higher press temperatures up to around 250 ° C, however, decomposition takes place, with a well-adhering but difficult-to-remove coating being formed on the press supplements, which grows in an unpleasant manner, particularly in the case of continuously working seizures, since it does not continuously mechanically can be removed. This coating deteriorates the heat transfer into the glued chip material, which disadvantageously requires longer pressing times. Business interruptions for the mechanical removal of the covering are a necessary consequence. Since the thickness of the covering increases over time, i.e. the covering thickness is not constant, it is still necessary to take larger grinding allowances into account, which not only suffers the cost-effectiveness of production, but also complicates the subsequent processing steps. The build-up of the covering can ultimately lead to the necessity to use lower pressing temperatures and thus longer pressing cycles.
Die Verwendung geeigneter Trennmittel auf dem hier angesprochenen Gebiet ist insbesondere in Verwendung mit Isocyanat als Bindemittel ein seit langer Zeit bekanntes und anstehendes Problem. Man hat nicht nur erhebliche Anstrengungen gemacht, innere Trennmittel (DE 31 08 537 A1) zu entwickeln, sondern auch nach anderen Wegen gesucht. So ist es aus der DE 38 20 376 C2 bekannt, bei der Herstellung einer mehrschichtigen Spanplatte in der Kernschicht und in den Deckschichten Isocyanat als Bindemittel zu verwenden und zusätzlich außen Trenndeckschichten, die mit Phenolharz gebunden sind, aufzubringen und nach dem Aushärten wieder zu entfernen. Durch diese Trenndeckschichten wurde verhindert, daß das Isocyanat mit den Preßzulagen in Kontakt kommt. Die Entfernung der Trenndeckschichten und die teilweise Entfernung der Deckschichten erfolgt durch einen Schleifvorgang.The use of suitable release agents in the field addressed here has been a problem that has been known for a long time and has been posed, particularly when used with isocyanate as a binder. Not only has considerable effort been made to develop internal release agents (DE 31 08 537 A1), but other ways have also been sought. For example, it is known from DE 38 20 376 C2 to use isocyanate as a binder in the production of a multilayer chipboard in the core layer and in the outer layers, and additionally to apply outside outer layers which are bound with phenolic resin and to remove them again after curing. These separating cover layers prevented the isocyanate from coming into contact with the pressing additives is coming. The removal of the separating cover layers and the partial removal of the cover layers is carried out by a grinding process.
Der Erfindung liegt die Aufgabe zugrunde, ein äußeres Trennmittel in Verbindung mit dem eingangs beschriebenen Verfahren aufzuzeigen, welches nicht nur geeignet ist, eine saubere Trennwirkung herbeizuführen, sondern auch bei höheren Preßtemperaturen bis in den Bereich von 250°C oder darüber einsetzbar ist, ohne daß Zersetzungserscheinungen eintreten oder ein störender Belagsaufbau auf den Preßzulagen resultiert.The invention has for its object to provide an external release agent in connection with the method described above, which is not only suitable to bring about a clean release effect, but can also be used at higher press temperatures in the range of 250 ° C or above, without Signs of decomposition occur or a disruptive build-up of deposits on the press supplements results.
Erfindungsgemäß wird dies bei dem Verfahren der eingangs beschriebenen Art dadurch erreicht, daß als Trennmittel Talkum Verwendung findet.According to the invention, this is achieved in the process of the type described at the outset by using talc as a release agent.
Die Erfindung beruht auf der Erkenntnis, daß der im Stand der Technik bei der Herstellung von Spanplatten bekannte Füllstoff Talkum in seiner alleinigen Verwendung, also ohne oberflächenaktive Subtanzen, zum Wirkstoff wird und so überraschenderweise Zersetzungserscheinungen sowie der Aufbau schwer entfernbarer Beläge auch dann vermieden werden, wenn mit vergleichsweise erhöhten Preßtemperaturen gearbeitet wird. Die Erfindung vermeidet weiterhin die Verwendung eines organischen Trennmittels und nutzt in wirtschaftlicher Weise das preiswerte Mineral Talkum als Wirkstoff. Talkum ist in seiner Anwendung auch unter Umweltgesichtspunkten unproblematisch. Es läßt sogar seinen kontinuierlichen Einsatz zu, ohne daß der Aufbau eines Belages auftritt. Bei kontinuierlichen Fressen findet auch eine kontinuierliche Reinigung der Preßzulagen statt. Diese bekannte kontinuierliche Reinigung, die ohnehin vorhanden ist, genügt völlig, um die Preßzulagen sauber zu halten. Damit ergibt sich ein gleichmäßiger Wärmeübergang, und die Preßeinrichtung kann mit hoher Leistung und gleichbleibender Geschwindigkeit betrieben werden. Die Produktion muß nicht zu gesonderten Reinigungszyklen unterbrochen werden. Die zu berücksichtigenden Dickentoleranzen der Platten können vorteilhaft klein gehalten werden, da auch im kontinuierlichen Betrieb immer konstante, reproduzierbare Verhältnisse vorliegen. Das Aufbringen des Talkums kann in üblicher Weise geschehen, beispielsweise durch Aufstreuen, Aufsprühen, Aufrollen o. dgl.. Das Talkum gelangt so auf die Preßzulagen, worunter einerseits die verschiedenen Preßwerkzeuge, wie Bleche, Platten, Bänder o. dgl. und andererseits auch die Transportmittel für den beleimten Rohstoff, insbesondere die Bänder, Walzen, Rollen u. dgl. verstanden werden.The invention is based on the knowledge that the filler talc known in the prior art for the production of particle board in its sole use, that is to say without surface-active substances, becomes the active substance and so, surprisingly, signs of decomposition and the build-up of hard-to-remove deposits can also be avoided if working with comparatively elevated press temperatures. The invention further avoids the use of an organic release agent and uses the inexpensive mineral talc as an active ingredient in an economical manner. Talc is also unproblematic in its use from an environmental point of view. It even allows its continuous use without the build-up of a covering. In the case of continuous feeding, the press supplements are also continuously cleaned. This known continuous cleaning, which is present anyway, is completely sufficient to keep the pressing supplements clean. This results in a uniform heat transfer, and the pressing device can be operated with high performance and constant speed. The production does not have to be interrupted for separate cleaning cycles. The thickness tolerances to be taken into account the plates can advantageously be kept small, since constant, reproducible conditions are always present even in continuous operation. The talc can be applied in a customary manner, for example by sprinkling, spraying, rolling up or the like. The talc thus reaches the pressing supplements, including on the one hand the various pressing tools such as sheets, plates, strips or the like and on the other hand also Means of transport for the glued raw material, in particular the tapes, rollers, rolls u. Like. To be understood.
Besonders vorteilhaft ist es, wenn das Talkum in Form einer wässrigen Suspension auf die Preßzulagen aufgebracht wird. Diese Suspension von Talkum in Wasser ermöglicht ein problemloses Aufbereiten und Handhaben der Suspension. Die Vorteile liegen in einem sparsamen Verbrauch, wobei gleichzeitig eine gleichmäßige Bedeckung der Preßzulagen erfolgt. Bei der Anwendung wird jegliche Staubentwicklung vermieden. Es entsteht eine hinreichende Haftung an den Preßzulagen. Durch die Temperatureinwirkung verdampft das Wasser während der Verpressung, wobei vorteilhaft die Haftung des Talkums an den Preßzulagen verringert wird und gleichzeitig die Trennwirkung beibehalten bleibt. Infolgedessen ist es möglich, die Preßzulagen mit den üblichen bekannten Reinigungseinrichtungen zu reinigen, ohne daß sich ein Belag auf den Preßzulagen aufbaut. Die Verwendung von Talkum in Form der Suspension wirkt sich in keiner Richtung nachteilig auf die sonstigen Verfahrensschritte bei der Herstellung solcher Span- oder Faserplatten aus. Die sonstigen Bedingungen des Herstellverfahrens können unverändert beibehalten bleiben. Auch die bekannten NCO-Gruppen aufweisenden Bindemittel, insbesondere polymeres Diphenylmethan-Diisocyanat (PMDI) in Alleinanwendung oder in Abmischung mit Polyolen kann unverändert vorteilhaft benutzt werden. Solche Bindemittel werden aufgrund der Reaktion mit den Hydroxylgruppen des Holzes auch als Polyurethan-Bindemittel (PUR) bezeichnet.It is particularly advantageous if the talc is applied to the pressing additives in the form of an aqueous suspension. This suspension of talc in water enables easy preparation and handling of the suspension. The advantages lie in economical consumption, while at the same time the pressing supplements are evenly covered. Any dust formation is avoided during use. Sufficient liability arises for the press supplements. The temperature evaporates the water during the pressing, advantageously reducing the adhesion of the talc to the pressing additives and at the same time maintaining the separating effect. As a result, it is possible to clean the pressing supplements with the usual known cleaning devices without a coating being built up on the pressing supplements. The use of talc in the form of the suspension has no adverse effects on the other process steps in the production of such chipboard or fiberboard. The other conditions of the manufacturing process can remain unchanged. The known binders containing NCO groups, in particular polymeric diphenylmethane diisocyanate (PMDI), used alone or in admixture with polyols, can also be used advantageously, unchanged. Such binders are also referred to as polyurethane binders (PUR) due to the reaction with the hydroxyl groups of the wood.
Das Talkum kann in einem Anteil von etwa 5 bis 40 Gew.-% - vorzugsweise etwa 20 Gew.-% -, bezogen auf das Gesamtgewicht der Suspension, eingesetzt werden. Damit ist zugleich eine sparsame Verwendung sichergestellt, was sich bezüglich des ohnehin preiswerten Trennmittels doppelt auswirkt. Eine mit diesen Anteilen definierte Suspension weist eine hinreichende Stabilität auf, läßt sich gut hantieren und erbringt eine ausgezeichnete Trennwirkung. Bei hohen Beleimungsgraden wird man auch einen vergleichsweise höheren Gewichtsanteil von Talkum in der Suspension wählen.The talc can be used in a proportion of approximately 5 to 40% by weight, preferably approximately 20% by weight, based on the total weight of the suspension. This also ensures economical use, which has a double effect with regard to the already inexpensive release agent. A suspension defined with these proportions has sufficient stability, is easy to handle and provides an excellent separation effect. At high degrees of gluing, a comparatively higher proportion by weight of talc in the suspension will also be selected.
Die Suspension wird während des Auftragens in Bewegung gehalten und damit ein Schaum gebildet, der einen gleichmäßigen Auftrag des Talkums auf die Preßzulagen ermöglicht. Damit werden nicht nur Absetzerscheinungen vermieden, sondern der Schaum wird als Transportmittel und als Verteiler genutzt, um den gleichmäßigen Auftrag auf die Preßzulagen zu erreichen. Die Schaumbildung auf der Suspension wird durch einen Rühr- oder Pumpvorgang erreicht.The suspension is kept in motion during application and thus a foam is formed which enables the talcum to be applied evenly to the pressing additives. This not only prevents signs of settling, but the foam is used as a means of transport and as a distributor in order to achieve even application to the pressing allowances. Foam formation on the suspension is achieved by stirring or pumping.
Besonders gute Ergebnisse wurden erzielt, wenn das Talkum mit einer mittleren Korngröße von etwa 10 µm eingesetzt wird. Dies bedeutet, daß ein wesentlicher Anteil des Talkums in diesem Korngrößenbereich liegen sollte, wobei feinere Bestandteile nicht stören. Bei Verwendung von groberem Talkum - etwa in einer Korngröße von >= 100 µm - gehen die Eigenschaften der Suspension, insbesondere die Fähigkeit, den Schaum zu bilden zunehmend verloren; auch wird die Suspension zunehmend instabiler, sodaß sich die Gleichmäßigkeit der auf den Preßzulagen entstehenden Schutzschicht verschlechtert.Particularly good results have been achieved if talc with an average grain size of about 10 µm is used. This means that a substantial proportion of the talc should be in this grain size range, whereby finer constituents do not interfere. When using coarser talcum - for example with a grain size of> = 100 µm - the properties of the suspension, in particular the ability to form the foam, are increasingly lost; the suspension also becomes increasingly unstable, so that the uniformity of the protective layer formed on the pressing supplements deteriorates.
Es ist auch sinnvoll, der Suspension während des Aufbringens Wasser hinzuzufügen. Dies kann in Schritten oder auch kontinuierlich erfolgen, um Verdunstungsverluste auszugleichen und die Aufbringung einer gleichmäßigen Schichtdicke zu begünstigen.It is also useful to add water to the suspension during application. This can be done in steps or continuously to compensate for evaporation losses and to promote the application of a uniform layer thickness.
Besonders vorteilhaft ist es, Talkum als äußeres Trennmittel in Verbindung mit einer kontinuierlichen Verpressung einer mit einem NCO-Gruppen aufweisenden Bindemittel gebundenen Span- oder Faserplatte einzusetzen. Dann ist es möglich, die Suspension auch kontinuierlich auf die Preßzulagen aufzutragen und die Preßzulagen kontinuierlich mit bekannten Reinigungseinrichtungen abzureinigen.It is particularly advantageous to use talc as an external release agent in conjunction with a continuous pressing of a particle board or fiber board bound with a binder containing NCO groups. Then it is possible to apply the suspension continuously to the pressing supplements and to continuously clean the pressing supplements using known cleaning devices.
Das erfindungsgemäße Verfahren wird durch die nachfolgenden Beispiele weiter erläutert und verdeutlicht:The process according to the invention is further explained and illustrated by the following examples:
Es wird eine wässrige Suspension von Talkum hergestellt, indem mehrere Ansätze zu einer Charge vereinigt werden. Für jeden Ansatz werden 40 kg Wasser mit einer Temperatur von etwa 20 °C vorgelegt und 10 kg Talkum hinzugefügt. Die Hinzufügung des Talkums erfolgt in 5 Portionen à 2 kg nacheinander. Das Talkum besitzt eine Korngröße von 30 µm. Die Portionen werden unter Verwenung eines schnell laufend angetriebenen Rührgerätes in das Wasser eingebracht. Danach werden 20 solche Ansätze à 50 kg zu der Charge vereinigt.An aqueous suspension of talc is prepared by combining several batches into one batch. For each batch, 40 kg of water at a temperature of about 20 ° C. are introduced and 10 kg of talc are added. The talc is added in 5 portions of 2 kg one after the other. The talc has a grain size of 30 µm. The portions are introduced into the water using a high-speed mixer. Then 20 such batches of 50 kg each are combined to form the batch.
Es wird eine wässrige Suspension von Talkum hergestellt, indem mehrere Ansätze zu einer Charge vereinigt werden. Für jeden Ansatz werden 160 kg Wasser mit einer Temperatur von etwa 25 °C vorgelegt und 40 kg Talkum hinzugefügt. Die Hinzufügung des Talkums erfolgt in 5 Portionen à 8 kg nacheinander. Das Talkum besitzt eine Korngröße von 20 µm. Die Portionen werden unter Verwenung eines schnell laufend angetriebenen Rührgerätes in das Wasser eingebracht. Danach werden 5 solche Ansätze à 200 kg zu der Charge vereinigt.An aqueous suspension of talc is prepared by combining several batches into one batch. For each batch, 160 kg of water at a temperature of about 25 ° C. are introduced and 40 kg of talc are added. The talc is added in 5 portions of 8 kg one after the other. The talc has a grain size of 20 µm. The portions are introduced into the water using a high-speed mixer. Then 5 such batches of 200 kg each are combined to form the batch.
Es wird eine wässrige Suspension von Talkum in einer Charge hergestellt, indem 700 kg Wasser mit einer Temperatur von etwa 50 °C vorgelegt und 300 kg Talkum hinzugefügt wird. Die Hinzufügung des Talkums erfolgt in 6 Portionen à 50 kg nacheinander. Das Talkum besitzt eine Korngröße von 10 µm. Die Portionen werden unter Verwenung eines Paddelrührers in das Wasser eingebracht. Der Paddelrührer wird mit höchst möglicher Geschwindigkeit angetrieben.An aqueous suspension of talc is prepared in one batch by introducing 700 kg of water at a temperature of about 50 ° C. and adding 300 kg of talc. The talc is added in 6 portions of 50 kg one after the other. The talc has a grain size of 10 µm. The portions are introduced into the water using a paddle stirrer. The paddle stirrer is driven at the highest possible speed.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19601401 | 1996-01-16 | ||
| DE19601401A DE19601401C1 (en) | 1996-01-16 | 1996-01-16 | Continuous production of chipboard or fibreboard |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0785053A2 true EP0785053A2 (en) | 1997-07-23 |
| EP0785053A3 EP0785053A3 (en) | 1999-03-31 |
| EP0785053B1 EP0785053B1 (en) | 2003-03-19 |
Family
ID=7782901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97200068A Expired - Lifetime EP0785053B1 (en) | 1996-01-16 | 1997-01-10 | Process for the continuous production of chip- or fibreboards |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0785053B1 (en) |
| DE (2) | DE19601401C1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007012691A1 (en) * | 2007-03-13 | 2008-09-18 | Kronotec Ag | Plate e.g. high density fiber plate, manufacturing method, involves blowing up wood fiber bonding agent mixture by air flow from reservoir to conveyor under spatial adjustment of fibers in desired thickness |
| WO2011100779A1 (en) | 2010-02-22 | 2011-08-25 | Herbert Mikowitsch | Method for producing a pressed board |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009047764A1 (en) | 2009-12-10 | 2011-06-16 | Evonik Goldschmidt Gmbh | Release agent and use for the production of composite moldings |
| SE2250239A1 (en) * | 2022-02-22 | 2023-08-23 | Ekoligens Ab | Moulded products and systems and methods for making such moulded products from cellulose fibres |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1148016A (en) | 1966-03-17 | 1969-04-10 | Novopan Ges Mbh Deutsche | An improved method for producing plates or moulded bodies |
| DE2647488A1 (en) | 1976-10-21 | 1978-04-27 | Basf Ag | METHOD FOR MANUFACTURING CHIPBOARD |
| DE3108537A1 (en) | 1981-03-06 | 1982-11-04 | Bayer Ag, 5090 Leverkusen | Aqueous isocyanate emulsions, and use thereof as binders in a process for the production of mouldings |
| DE3820376C2 (en) | 1988-06-15 | 1992-10-01 | Glunz Ag, 4700 Hamm, De |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB665673A (en) * | 1944-08-09 | 1952-01-30 | Arthur Ray Welch | Method of and apparatus for making improved wood products |
| US4131662A (en) * | 1978-01-03 | 1978-12-26 | Mobay Chemical Corporation | Talc-based external mold release agent for polyurethane foams |
| US5302330A (en) * | 1993-06-08 | 1994-04-12 | Harold Umansky | Method for the manufacture of waferboard |
-
1996
- 1996-01-16 DE DE19601401A patent/DE19601401C1/en not_active Expired - Fee Related
-
1997
- 1997-01-10 DE DE59709532T patent/DE59709532D1/en not_active Expired - Lifetime
- 1997-01-10 EP EP97200068A patent/EP0785053B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1148016A (en) | 1966-03-17 | 1969-04-10 | Novopan Ges Mbh Deutsche | An improved method for producing plates or moulded bodies |
| DE2647488A1 (en) | 1976-10-21 | 1978-04-27 | Basf Ag | METHOD FOR MANUFACTURING CHIPBOARD |
| DE3108537A1 (en) | 1981-03-06 | 1982-11-04 | Bayer Ag, 5090 Leverkusen | Aqueous isocyanate emulsions, and use thereof as binders in a process for the production of mouldings |
| DE3820376C2 (en) | 1988-06-15 | 1992-10-01 | Glunz Ag, 4700 Hamm, De |
Non-Patent Citations (1)
| Title |
|---|
| DEPPE E.: "Taschenbuch der Spanplattentechnik.", 1991, pages: 60 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007012691A1 (en) * | 2007-03-13 | 2008-09-18 | Kronotec Ag | Plate e.g. high density fiber plate, manufacturing method, involves blowing up wood fiber bonding agent mixture by air flow from reservoir to conveyor under spatial adjustment of fibers in desired thickness |
| DE102007012691B4 (en) * | 2007-03-13 | 2016-05-12 | SWISS KRONO Tec AG | Process for the production of wood fiber boards and LDF, MDF and HDF boards produced by this process |
| WO2011100779A1 (en) | 2010-02-22 | 2011-08-25 | Herbert Mikowitsch | Method for producing a pressed board |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0785053A3 (en) | 1999-03-31 |
| EP0785053B1 (en) | 2003-03-19 |
| DE59709532D1 (en) | 2003-04-24 |
| DE19601401C1 (en) | 1997-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3150626C2 (en) | ||
| EP0234459B1 (en) | Aqueous glue dispersions containing polyisocyanates, their preparation and their use | |
| CH520564A (en) | Binding agents for chipboard manufacture are | |
| DE2534741C2 (en) | Process for the production of a delamination-resistant laminate | |
| DE10144524B4 (en) | Bonding of plastic extrudates with material surfaces | |
| DE3128808A1 (en) | ADHESIVES AND THEIR USE | |
| DE19601401C1 (en) | Continuous production of chipboard or fibreboard | |
| DE1653178A1 (en) | Process for the production of plates or molded bodies from particles of wood, cellulose or lignocellulose-containing materials or the like mixed with binder. | |
| EP0595003B1 (en) | Thermosetting composition | |
| DE1812250B2 (en) | PROCESS FOR THE PRODUCTION OF SMALL ELASTOMERIC POLYURETHANE PARTICLES | |
| EP2567798B1 (en) | Use of polyamine in wood materials for reducing the emission of aldehydes and/or acids | |
| DE1004753B (en) | Process for the production of a self-supporting adhesive film | |
| DE19604575A1 (en) | Process for the production of chipboard or fiberboard | |
| EP2930219A1 (en) | Reactive adhesive systems and their use | |
| EP4010158A1 (en) | Material board and method for producing a material board | |
| DE19751326C2 (en) | Process for the production of wood materials using used, residual and waste wood materials | |
| DE19524017A1 (en) | Finishing of panels such as ply wood | |
| EP4279518B1 (en) | Method for manufacturing an osb wooden panel | |
| EP0056935A1 (en) | Method of making wood particle mouldings | |
| EP4141038B1 (en) | Wood material and binder composition and method for producing a wood material | |
| DE2538999A1 (en) | BINDING AGENT COMPONENT FOR PU BINDING AGENT, MANUFACTURING PROCESS AND USE | |
| DE3330119A1 (en) | PEN OR CHALK AND METHOD FOR THE PRODUCTION THEREOF | |
| DE102005023476B4 (en) | Method for producing a panel of polyurethane | |
| DE10035412B4 (en) | Process for the continuous production of continuous veneer layer boards | |
| DE3911661A1 (en) | Removing adhering matter from press platens, etc. - formed during prodn. of e.g. chipboard, by hot-pressing article contg. in outer layer mixt. of novolak, hardener, and aminoplast |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB IT |
|
| 17P | Request for examination filed |
Effective date: 19990329 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: GLUNZ AG |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| 17Q | First examination report despatched |
Effective date: 20020529 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REF | Corresponds to: |
Ref document number: 59709532 Country of ref document: DE Date of ref document: 20030424 Kind code of ref document: P |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20031222 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20160122 Year of fee payment: 20 Ref country code: DE Payment date: 20151215 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20160121 Year of fee payment: 20 Ref country code: GB Payment date: 20160122 Year of fee payment: 20 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59709532 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20170109 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20170109 |