EP0107155A2 - Process for improving the properties of fibre-made articles and apparatus for the application of the process - Google Patents
Process for improving the properties of fibre-made articles and apparatus for the application of the process Download PDFInfo
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- EP0107155A2 EP0107155A2 EP83110249A EP83110249A EP0107155A2 EP 0107155 A2 EP0107155 A2 EP 0107155A2 EP 83110249 A EP83110249 A EP 83110249A EP 83110249 A EP83110249 A EP 83110249A EP 0107155 A2 EP0107155 A2 EP 0107155A2
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- European Patent Office
- Prior art keywords
- resin
- molded parts
- properties
- pressure
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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
- B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J1/00—Fibreboard
- D21J1/08—Impregnated or coated fibreboard
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
Definitions
- the invention relates to a process for the properties sheep + sverêtung, slurry fiber, then wetted in particular water resistance and mechanical strength of from cellulosic press-molded parts produced in which exposed the mold parts to a vacuum using a suitable flowable resin, subjected to a pressure increase and then cured.
- such molded parts are produced in substantial quantities, in some cases their surface properties are desirably rounded off by surface impregnation with synthetic resins, and are used technically wherever the final properties that can be achieved with them are used the requirements set must be brought into line.
- Such molded parts are currently used in a wide range of applications. as a carrier for interior parts in motor vehicle construction and as a material for loudspeaker membranes.
- the goal is to improve the properties of molded fiber parts in order to achieve the level of properties of molded plastic parts and at the same time to use the known high proportion of available and renewable raw materials.
- the invention is based on the object of specifying a more economical impregnation process for fiber molded parts, which is characterized by better resin utilization and short-term impregnation treatment, with no drop and runner formation occurring on the surfaces of the impregnated molded parts.
- the object is achieved by using the method according to the invention, because the impregnation time can be reduced to a duration of only minutes.
- the resin which is still separated from the wetted molded parts under vacuum and is therefore not fully reacted, is available for subsequent further impregnations, which greatly increases the economic yield.
- liquid isocyanate group-containing mono-, oligo- and / or polymers with constituents of wood and / or cellulose constituents can react chemically to form solids and, together with them, harden process, such as in - "Polyurethanes in the fifth decade" - v. G. Oertel KUNSTSTOFFE 1/81 - mentioned, without any additional component such as a polyol.
- the existing relatively high gas and / or liquid absorption and permeability is typical for the fibrous molded articles mentioned.
- the aftertreatment of fiber molded parts is accordingly carried out with liquid resins containing isocyanate under conditions which take advantage of the liquid absorption of the molded parts and at the same time reliably preclude the contact of the molded part constituents reacting with isocyanate groups with the resin wherever outside the part the storage stability of the liquid phase must be preserved.
- the essence and content of the invention therefore consists in an economical process which ensures the penetration of fiber molded parts with a suitable isocyanate resin, thereby reliably precluding the contact of ingredients of the molded parts with resin components which have not penetrated into them.
- the penetration of the resin content is cured by chemical reaction with the components' ingredients.
- the reaction products attach themselves to the fiber structure, largely fixing and sealing it.
- a non-toxic isocyanate resin which is matched in viscosity, reactivity, NCO content and chemical structure to the liquid absorption and the content of reactants of the fiber molding and the desired end properties, in such a way that the resin preferably already contains degassed molded parts are brought into contact for wetting and penetrates into the molded parts by increasing the pressure.
- the molded parts can be in the same container above an isocyanate resin liquid level. After reaching the desired vacuum in the container, about 30-100 torr, the resin floods the parts. The fiber molded parts are still separated from excess liquid under negative pressure after the surface-attached resin has run off. When the pressure is increased, preferably in the range from atmospheric pressure to about 20 bar, then only the quantity of the resin liquid film still adhering to the parts penetrates and drip and runner formation are excluded.
- the curing can then take place in a separate container at elevated temperature.
- these processes take place in a rotatable and / or tiltable vacuum and / or pressure vessel, with the vessel being rotated through 180.degree.,
- the molding process for molding molded parts in an isocyanate resin bath and the reversal or further rotation of the separation of the two Components takes place.
- the fibrous molded parts treated with the one-component isocyanate resin become the usual, possibly accelerating the hardening process exposed, while the unused portion of the resin remains available for repetitions of the process and is replenished with fresh produce if necessary.
- the fibrous material can be enriched with mechanically higher-strength fibers in order to incorporate their specific properties intrastructurally into the final properties of the subsequently reinforced molded part.
- FIBRIT R supports (car door panels) are fixed one above the other at a distance of approx. 10 mm in a grid cage and attached to suitable fittings above the liquid level in a lid tank that contains 300 l of a commercially available MDI resin.
- the entire tank is evacuated at a temperature of 35 ° C to a pressure of 0.07 bar and tilted by 180 ° after 5 minutes.
- the FIBRIT R carriers get into the resin liquid, remain there for 30 s and return to the starting position by tilting by another 180 °.
- the parts are free of larger adhering liquid residues and are hardened at 95 ° C for a few hours.
- the weight increase of the parts is 24.5-26.0% by weight.
- the reinforced molded parts are boil-resistant and show a 3-fold increase in the elastic modulus compared to the initial value in the bending test. Outside weathering shows no negative results after 18 months except yellowing. The excess resin content cannot be measured in this way in terms of viscosity and NCO content.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Eigen- schaf+ sverbesserung, insbesondere der Wasserbeständigkeit und mechanischen Festigkeit von aus zellulosehaltiger Faserstoff-Aufschlämmung durch Pressen erzeugten Formteilen, bei dem die Formteile einem Unterdruck ausgesetzt, dann mit einem geeigneten fließfähigen Harz benetzt, einer Druckerhöhung unterworfen und anschließend ausgehärtet werden. `The invention relates to a process for the properties sheep + sverbesserung, slurry fiber, then wetted in particular water resistance and mechanical strength of from cellulosic press-molded parts produced in which exposed the mold parts to a vacuum using a suitable flowable resin, subjected to a pressure increase and then cured. `
Nach dem heutigen Stand der Technik werden derartige beispielsweise in den DE-PSen 803 019 und 803 085 beschriebene Formteile in wesentlichen Stückzahlen hergestellt, teilweise durch oberflächliche Imprägnierung mit Kunstharzen in ihrem Eigenschaftenbild wünschenswert abgerundet, und überall dort technisch eingesetzt, wo die damit erzielbaren Endeigenschaften mit den gestellten Anforderungen gezielt in Einklang zu bringen sind. Große Anwendungsbereiche finden solche Formteile derzeit u.a. als Träger von Innenausstattungsteilen im Kraftfahrzeugbau sowie als Material für Lautsprechermembranen.According to the current state of the art, such molded parts, for example described in DE-PS 803 019 and 803 085, are produced in substantial quantities, in some cases their surface properties are desirably rounded off by surface impregnation with synthetic resins, and are used technically wherever the final properties that can be achieved with them are used the requirements set must be brought into line. Such molded parts are currently used in a wide range of applications. as a carrier for interior parts in motor vehicle construction and as a material for loudspeaker membranes.
Das Ziel ist eine Verbesserung der Eigenschaften von Faserstoff-Formteilen, um mit diesen das Eigenschaftsniveau von Kunststoff-Formteilen zu erreichen und dabei gleichzeitig den bekannt hohen Anteil von verfügbaren und regenerierbaren Rohstoffen zu nutzen.The goal is to improve the properties of molded fiber parts in order to achieve the level of properties of molded plastic parts and at the same time to use the known high proportion of available and renewable raw materials.
Aus der DE-PS 864 917 ist ein Verfahren zum Veredeln von geformten Massen aus Fasermaterialien, wie Holz oder Zellulosefasern, bekannt, nach welchem diese Stoffe mit Diisocyanaten unter Druck imprägniert werden, wobei das Imprägniermittel dann mit oder ohne Druck ausgehärtet wird. Durch dieses bekannte Verfahren wird die Oberflächenhärte erhöht und die Wasserquellbarkeit des Holzes stark vermindert. Um das Eindringen des Harzes in das Faserstoff-Formteil unter Druck zu ermöglichen, wird das Harz mit einem Lösungsmittel, z.B. Butylacetat, versetzt. Dieses bekannte Verfahren hat verschiedene Nachteile. Zum einen erhöht die Verwendung eines Lösungsmittels den wirtschaftlichen Aufwand für die Durchführung des Verfahrens. Ferner müssen Maßnahmen getroffen werden, um das Lösungsmittel zu verdunsten, wobei Umweltbelastungen vermieden werden müssen. Schließlich erfordert der Aushärtevorgang die Anwendung von Druck, um ein Austreten des Harzes aus dem Faserstoffgefüge zu vermeiden. Der gesamte Behandlungszyklus dauert dabei mehrere Stunden.From DE-PS 864 917 a method for finishing shaped masses of fiber materials such as wood or cellulose fibers is known, according to which these substances are impregnated with diisocyanates under pressure, the impregnating agent then being cured with or without pressure. This known method increases the surface hardness and greatly reduces the water swellability of the wood. To allow the resin to penetrate the pulp molding under pressure, the resin is rinsed with a solvent, e.g. Butyl acetate. This known method has several disadvantages. Firstly, the use of a solvent increases the economic outlay for carrying out the method. Measures must also be taken to evaporate the solvent, while avoiding environmental pollution. Finally, the curing process requires the application of pressure to prevent the resin from escaping from the fibrous structure. The entire treatment cycle takes several hours.
Bei der Imprägnierung von Holz mit Vinyl-Monomeren hat man gemäß DE-Z "Holz als Roh- und Werkstoff", 1968, Seite 110, Referat 7.2.4 die Teile auch schon einem Unterdruck ausgesetzt und im Unterdruck mit Harz benetzt. Anschließend wurde der Druck auf Atmosphärendruck erhöht und nach vier Stunden das überschüssige Harz entfernt, worauf der Druck auf 21 bar erhöht wurde und die Teile für 18 Stunden diesem Druck ausgesetzt wurden. Danach erfolgte ein langsamer Druckabbau während 1,5 Stunden.When impregnating wood with vinyl monomers, the parts have already been exposed to a negative pressure and wetted with resin under negative pressure in accordance with DE-Z "Wood as a Raw Material", 1968, page 110, section 7.2.4. The pressure was then increased to atmospheric pressure and after four hours the excess resin was removed, whereupon the pressure was increased to 21 bar and the parts were exposed to this pressure for 18 hours. This was followed by a slow decrease in pressure over 1.5 hours.
Neben der ebenfalls stundenlangen Imprägnierungsdauer ist bei diesem bekannten Verfahren vor allem von Nachteil, daß bei Verwendung eines mit dem Fasermaterial reaktiven Harzes die gesamte eingesetzte Harzmenge anreagiert wäre und für eine weitere Verwendung daher nicht mehr zur Verfügung stehen könnte. Die wirtschaftliche Ausbeute bei diesem bekannten Verfahren ist daher in zweierlei Hinsicht ungenügend. Außerdem ist auch hier offensichtlich eine Aushärtung nur unter höherem Druck (20 atü) möglich, um tropfen- und läuferfreie Oberflächen zu erhalten.In addition to the impregnation time, which also lasts for hours, the disadvantage of this known method is that if a resin reactive with the fiber material were used, the entire amount of resin used would have reacted and could therefore no longer be available for further use. The economic yield in this known method is therefore insufficient in two ways. In addition, curing is obviously only possible under higher pressure (20 atm) in order to obtain drip-free and run-free surfaces.
Der Erfindung liegt nun die Aufgabe zugrunde, ein durch bessere Harzausnutzung und kurzzeitigere Imprägnierungsbehandlung gekennzeichnetes wirtschaftlicheres Imprägnierungsverfahren für Faserstoff-Formteile anzugeben, wobei keine Tropfen- und Läuferbildung an den Oberflächen der imprägnierten Formteile auftreten soll.The invention is based on the object of specifying a more economical impregnation process for fiber molded parts, which is characterized by better resin utilization and short-term impregnation treatment, with no drop and runner formation occurring on the surfaces of the impregnated molded parts.
Zur Lösung dieser Aufgabe wird erfindungsgemäß das im Anspruch 1 gekennzeichnete Verfahren vorgeschlagen.To achieve this object, the method characterized in claim 1 is proposed according to the invention.
Durch Anwendung des erfindungsgemäßen Verfahrens wird die gestellte Aufgabe gelöst, denn die Imprägnierungszeit kann auf eine nur Minuten währende Dauer verkürzt werden. Darüber hinaus steht das noch im Unterdruck von den benetzten Formteilen getrennte und daher nicht anreagierte Harz für nachfolgende weitere Imprägnierungen zur Verfügung, wodurch die wirtschaftliche Ausbeute stark erhöht wird.The object is achieved by using the method according to the invention, because the impregnation time can be reduced to a duration of only minutes. In addition, the resin, which is still separated from the wetted molded parts under vacuum and is therefore not fully reacted, is available for subsequent further impregnations, which greatly increases the economic yield.
Bekanntlich können flüssige isocyanatgruppenhaltige Mono-, Oligo- und/oder Polymere mit Inhaltsstoffen von Holz-und/oder Zellulosestoffbestandteilen chemisch zu Festkörpern reagieren und gemeinsam mit diesen einem Härtungsprozeß, wie beispielsweise in -"Polyurethane in der fünften Dekade"- v. G. Oertel KUNSTSTOFFE 1/81 - erwähnt, unterzogen werden, ohne einer weiteren Komponente, wie z.B. eines Polyols zu bedürfen. Daneben ist die vorhandene relativ hohe Gas- und/oder Flüssigkeitsaufnahme und -durchlässigkeit bei den genannten Faserstoff-Formkörpern typisch.As is known, liquid isocyanate group-containing mono-, oligo- and / or polymers with constituents of wood and / or cellulose constituents can react chemically to form solids and, together with them, harden process, such as in - "Polyurethanes in the fifth decade" - v. G. Oertel KUNSTSTOFFE 1/81 - mentioned, without any additional component such as a polyol. In addition, the existing relatively high gas and / or liquid absorption and permeability is typical for the fibrous molded articles mentioned.
Weiterhin ist die Empfindlichkeit von flüssigen technischen Isocyanaten gegenüber den mit ihnen reaktionsfähigen Bestandteilen von Kontaktstoffen im Hinblick auf unerwünschte Veränderung der Lieferformen bzw. der ihrer Lagerstabilität bekannt.Furthermore, the sensitivity of liquid technical isocyanates to the constituents of contact substances that react with them is known with regard to undesired changes in the delivery forms or in their storage stability.
Die Nachbehandlung von Faserstoff-Formteilen wird dementsprechend mit isocyanathaltigen, flüssigen Harzen unter Bedingungen durchgeführt, die die Flüssigkeitsaufnahme der Formteile ausnutzen und gleichzeitig den Kontakt der mit Isocyanatgruppen reagierenden Formteil-Inhaltsstoffen mit dem Harz überall da sicher ausschließen, wo außerhalb des Teiles die Lagerstabilität der Flüssigphase erhalten bleiben muß.The aftertreatment of fiber molded parts is accordingly carried out with liquid resins containing isocyanate under conditions which take advantage of the liquid absorption of the molded parts and at the same time reliably preclude the contact of the molded part constituents reacting with isocyanate groups with the resin wherever outside the part the storage stability of the liquid phase must be preserved.
Wesen und Inhalt der Erfindung besteht demnach in einem wirtschaftlichen Verfahren, das die Durchdringung von Faserstoff-Formteilen mit einem geeigneten Isocyanatharz gewährleistet, dabei den Kontakt von Inhaltsstoffen der Formteile mit nicht in diese eingedrungenen Harzanteilen sicher ausschließt. Die Aushärtung des eingedrungenen Harzanteils erfolgt durch chemische Reaktion mit Inhaltsstoffen der Teile. Die Reaktionsprodukte lagern sich an das Fasergefüge an, fixieren und dichten es weitgehend ab.The essence and content of the invention therefore consists in an economical process which ensures the penetration of fiber molded parts with a suitable isocyanate resin, thereby reliably precluding the contact of ingredients of the molded parts with resin components which have not penetrated into them. The penetration of the resin content is cured by chemical reaction with the components' ingredients. The reaction products attach themselves to the fiber structure, largely fixing and sealing it.
In bevorzugter Ausführungsform gelangt ein ungiftiges Isocyanatharz, das in Viskosität, Reaktivität, NCO-Gehalt und chemischer Struktur auf die Flüssigkeitsaufnahme und den Gehalt an Reaktionspartnern des Faserstoff-Formteils sowie die gewünschten Endeigenschaften hin abgestimmt ist, derart zur Anwendung, daß das Harz mit vorzugsweise bereits entgasten Formteilen zur Benetzung in Kontakt gebracht wird und durch Druckerhöhung in die Formteile eindringt.In a preferred embodiment, a non-toxic isocyanate resin is used which is matched in viscosity, reactivity, NCO content and chemical structure to the liquid absorption and the content of reactants of the fiber molding and the desired end properties, in such a way that the resin preferably already contains degassed molded parts are brought into contact for wetting and penetrates into the molded parts by increasing the pressure.
Die Formteile können sich im gleichen Behälter über einem Isocyanatharz-Flüssigkeitsspiegel befinden. Nach Erreichen des gewünschten Vakuums im Behälter, etwa 30-- 100 Torr, überflutet das Harz die Teile. Die Faserstoff-Formteile werden noch im Unterdruck von überschüssiger Flüssigkeit getrennt, nachdem an diesen oberflächlich angelagertes Harz abläuft. Bei der Druckerhöhung, bevorzugt im Bereich von Atmosphärendruck bis etwa 20 bar, dringt dann ausschließlich das Quantum des noch an den Teilen anhaftenden Harz-Flüssigkeitsfilmes ein und Tropfen- und Läuferbildungen sind ausgeschlossen.The molded parts can be in the same container above an isocyanate resin liquid level. After reaching the desired vacuum in the container, about 30-100 torr, the resin floods the parts. The fiber molded parts are still separated from excess liquid under negative pressure after the surface-attached resin has run off. When the pressure is increased, preferably in the range from atmospheric pressure to about 20 bar, then only the quantity of the resin liquid film still adhering to the parts penetrates and drip and runner formation are excluded.
Anschließend kann die Aushärtung in einem separaten Behälter bei erhöhter Temperatur erfolgen.The curing can then take place in a separate container at elevated temperature.
In weiterer bevorzugter Ausführungsform finden diese Vorgänge in einem dreh- und/oder kippbaren Unter- und/oder Überdruckgefäß statt, wobei durch Drehung des Gefäßes um 180° der Tauchvorgang von Formstoff-Formteilen in ein Isocyanatharzbad und durch Umkehrung oder weitere Drehung die erneute Trennung beider Komponenten stattfindet.In a further preferred embodiment, these processes take place in a rotatable and / or tiltable vacuum and / or pressure vessel, with the vessel being rotated through 180.degree., The molding process for molding molded parts in an isocyanate resin bath and the reversal or further rotation of the separation of the two Components takes place.
Nach den genannten Ausführungsformen werden die mit dem einkomponentigen Isocyanatharz behandelten Faserstoff-Formteile üblichen, ggf. die Härtung forcierenden Bedingungen ausgesetzt, während der unbeanspruchte Anteil des Harzes für Wiederholungen des Vorgangs verfügbar bleibt und bei Bedarf mit Frischware aufgefüllt wird.According to the above-mentioned embodiments, the fibrous molded parts treated with the one-component isocyanate resin become the usual, possibly accelerating the hardening process exposed, while the unused portion of the resin remains available for repetitions of the process and is replenished with fresh produce if necessary.
Der Faserstoff kann mit mechanisch hochfesteren Fasern angereichert werden, um deren spezifische Eigenschaften intrastrukturell in die Endeigenschaften des.nachträglich verstärkten Formteils einzubeziehen.The fibrous material can be enriched with mechanically higher-strength fibers in order to incorporate their specific properties intrastructurally into the final properties of the subsequently reinforced molded part.
Die neuen Möglichkeiten, die sich durch das erfindungsgemäße Verfahren ergeben, führen zu preiswerten verstärkten Faserstoff-Formteilen, die vorwiegend aus regenerierbaren, langfristig verfügbaren Rohstoffen bestehen und dabei diesen Teilen bisher nicht bekannte Eigenschaften wie u.a. Wasser- und Wetterbeständigkeit, Temperaturbeständigkeit, hohe mechanische Festigkeit, Überlackierbarkeit auch mit lösungsmittelhaltigen Systemen sowie die Möglichkeit zu universellen Krafteinleitung verleihen und somit in den aussichtsreichen Wettbewerb mit handelsüblichen Formstoffen, die vergleichbare Eigenschaften aufweisen, treten bzw. für Faserstoff-Formteile völlig neue Anwendungsbereiche erschließen können.The new possibilities that result from the process according to the invention lead to inexpensive reinforced fiber molded parts, which mainly consist of renewable, long-term raw materials and thereby have properties not previously known to these parts such as i.a. Water and weather resistance, temperature resistance, high mechanical strength, paintability even with solvent-based systems as well as the possibility of universal application of force and thus enter into the promising competition with commercially available molded materials that have comparable properties, or can open up completely new areas of application for molded fiber parts .
Fünf handelsübliche FIBRITR-Träger (PKW-Türverkleidung) werden in einem Gitterkäfig übereinander mit einem Abstand von ca. 10 mm fixiert und in einem Deckel-Tank, der 300 ltr eines handelsüblichen MDI-Harzes enthält, über dem Flüssigkeitsspiegel an geeigneten Einbauten befestigt.Five commercially available FIBRIT R supports (car door panels) are fixed one above the other at a distance of approx. 10 mm in a grid cage and attached to suitable fittings above the liquid level in a lid tank that contains 300 l of a commercially available MDI resin.
Nach Verschließen des Deckels wird der gesamte Tank bei einer Temperatur von 35° C bis zu einem Druck von 0,07 bar evakuiert und nach 5 Min. um 180° gekippt. Dabei gelangen die FIBRITR-Träger in die Harzflüssigkeit, verbleiben dort 30 s und kommen durch Kippen um weitere 180° in die Ausgangsstellung zurück. - Nach dem Belüften des Tanks und Öffnen des Deckels sind die Teile frei von größeren anhaftenden Flüssigkeitsrückständen und werden einige Stunden bei 95° C gehärtet.After closing the lid, the entire tank is evacuated at a temperature of 35 ° C to a pressure of 0.07 bar and tilted by 180 ° after 5 minutes. The FIBRIT R carriers get into the resin liquid, remain there for 30 s and return to the starting position by tilting by another 180 °. - After venting the tank and opening the lid, the parts are free of larger adhering liquid residues and are hardened at 95 ° C for a few hours.
Die Gewichtszunahme der Teile beträgt 24,5 - 26,0 Gew.-%. Die verstärkten Formteile sind kochbeständig und zeigen einen gegenüber dem Ausgangswert um das 3,Sfache gestiegenen E-Modul im Biegeversuch. Freibewitterung zeigt nach 18 Monaten außer Vergilbung keinen negativen Befund. Der überschüssige Harzanteil verändert sich durch diese Arbeitsweise in Viscosität und NCO-Gehalt nicht meßbar.The weight increase of the parts is 24.5-26.0% by weight. The reinforced molded parts are boil-resistant and show a 3-fold increase in the elastic modulus compared to the initial value in the bending test. Outside weathering shows no negative results after 18 months except yellowing. The excess resin content cannot be measured in this way in terms of viscosity and NCO content.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823239094 DE3239094A1 (en) | 1982-10-22 | 1982-10-22 | METHOD AND DEVICE FOR REINFORCING FIBER MOLDED PARTS |
| DE3239094 | 1982-10-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0107155A2 true EP0107155A2 (en) | 1984-05-02 |
| EP0107155A3 EP0107155A3 (en) | 1984-09-12 |
Family
ID=6176321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83110249A Ceased EP0107155A3 (en) | 1982-10-22 | 1983-10-14 | Process for improving the properties of fibre-made articles and apparatus for the application of the process |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0107155A3 (en) |
| DE (1) | DE3239094A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2649734A1 (en) * | 1989-07-11 | 1991-01-18 | Amson Yves | Industrial method of manufacture of shaped pieces from paper pulp |
| AT396137B (en) * | 1991-05-06 | 1993-06-25 | Leitgeb Ag | WOOD FIBER INSULATION PANEL |
| WO1998056989A1 (en) * | 1997-06-12 | 1998-12-17 | Windsor Technologies Limited | Method for treating a lignocellulosic material |
| WO2002064337A2 (en) * | 2001-02-13 | 2002-08-22 | Mdf, Inc. | Resin-impregnated substrate, method of manufacture and system therefor |
| WO2007128534A2 (en) * | 2006-05-08 | 2007-11-15 | Dirk Dammers | Plate, especially panel for covering walls or ceilings or as a floor covering, and method for the production of a plate |
| EP2206589A1 (en) | 2009-01-13 | 2010-07-14 | Drywood Coatings B.V. | Method for covering a composite lignocellulose element |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE864917C (en) * | 1941-11-21 | 1953-01-29 | Bayer Ag | Process for the finishing of shaped masses of fiber materials |
| CH616361A5 (en) * | 1975-04-04 | 1980-03-31 | Desowag Bayer Holzschutz Gmbh | Apparatus for impregnating solid wood, wooden materials and other porous materials with liquids |
| EP0013546A1 (en) * | 1978-12-13 | 1980-07-23 | Österreichisches Forschungszentrum Seibersdorf Ges.m.b.H. | Process for producing wood/plastics compositions |
| DE2524423B2 (en) * | 1974-06-04 | 1981-06-04 | EPEX, Carquefou, Loire-Atlantique | Process and system for impregnating flat blanks made of fiber material |
-
1982
- 1982-10-22 DE DE19823239094 patent/DE3239094A1/en not_active Ceased
-
1983
- 1983-10-14 EP EP83110249A patent/EP0107155A3/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE864917C (en) * | 1941-11-21 | 1953-01-29 | Bayer Ag | Process for the finishing of shaped masses of fiber materials |
| DE2524423B2 (en) * | 1974-06-04 | 1981-06-04 | EPEX, Carquefou, Loire-Atlantique | Process and system for impregnating flat blanks made of fiber material |
| CH616361A5 (en) * | 1975-04-04 | 1980-03-31 | Desowag Bayer Holzschutz Gmbh | Apparatus for impregnating solid wood, wooden materials and other porous materials with liquids |
| EP0013546A1 (en) * | 1978-12-13 | 1980-07-23 | Österreichisches Forschungszentrum Seibersdorf Ges.m.b.H. | Process for producing wood/plastics compositions |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2649734A1 (en) * | 1989-07-11 | 1991-01-18 | Amson Yves | Industrial method of manufacture of shaped pieces from paper pulp |
| AT396137B (en) * | 1991-05-06 | 1993-06-25 | Leitgeb Ag | WOOD FIBER INSULATION PANEL |
| CN1099503C (en) * | 1997-06-12 | 2003-01-22 | 温泽技术有限公司 | Method of making lignocellulosic board |
| WO1998056989A1 (en) * | 1997-06-12 | 1998-12-17 | Windsor Technologies Limited | Method for treating a lignocellulosic material |
| WO1998056991A1 (en) * | 1997-06-12 | 1998-12-17 | Windsor Technologies Limited | Method of making lignocellulosic board |
| AU725986B2 (en) * | 1997-06-12 | 2000-10-26 | Windsor Technologies Limited | Method of making lignocellulosic board |
| AU726259B2 (en) * | 1997-06-12 | 2000-11-02 | Windsor Technologies Limited | Method for treating a lignocellulosic material |
| US6335058B1 (en) | 1997-06-12 | 2002-01-01 | Windsor Technologies Limited | Method for treating a lignocellulosic material |
| US6403000B1 (en) | 1997-06-12 | 2002-06-11 | Windsor Technologies, Limited | Method of making lignocellulosic board |
| WO2002064337A2 (en) * | 2001-02-13 | 2002-08-22 | Mdf, Inc. | Resin-impregnated substrate, method of manufacture and system therefor |
| WO2002064337A3 (en) * | 2001-02-13 | 2003-02-27 | Mdf Inc | Resin-impregnated substrate, method of manufacture and system therefor |
| AU2002245423B2 (en) * | 2001-02-13 | 2005-11-24 | Houston Advanced Research Center | Resin-impregnated substrate, method of manufacture and system therefor |
| CN100368168C (en) * | 2001-02-13 | 2008-02-13 | 休斯敦高级研究中心 | Resin impregnated substrate, method of mfg. and system therefor |
| WO2007128534A2 (en) * | 2006-05-08 | 2007-11-15 | Dirk Dammers | Plate, especially panel for covering walls or ceilings or as a floor covering, and method for the production of a plate |
| WO2007128534A3 (en) * | 2006-05-08 | 2008-03-13 | Dirk Dammers | Plate, especially panel for covering walls or ceilings or as a floor covering, and method for the production of a plate |
| EP2206589A1 (en) | 2009-01-13 | 2010-07-14 | Drywood Coatings B.V. | Method for covering a composite lignocellulose element |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0107155A3 (en) | 1984-09-12 |
| DE3239094A1 (en) | 1984-04-26 |
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