EP0518017A1 - Wood-fiber-board, method for its production and use of the same - Google Patents

Wood-fiber-board, method for its production and use of the same Download PDF

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Publication number
EP0518017A1
EP0518017A1 EP92105877A EP92105877A EP0518017A1 EP 0518017 A1 EP0518017 A1 EP 0518017A1 EP 92105877 A EP92105877 A EP 92105877A EP 92105877 A EP92105877 A EP 92105877A EP 0518017 A1 EP0518017 A1 EP 0518017A1
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Prior art keywords
wood fiber
layer
board
water
wood
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EP0518017B1 (en
EP0518017B2 (en
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Pavatex SA
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D12/00—Non-structural supports for roofing materials, e.g. battens, boards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/006—Pretreatment of moulding material for increasing resistance to swelling by humidity
    • 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
    • B27N3/20—Moulding or pressing characterised by using platen-presses

Definitions

  • the invention relates to a wood fiber board.
  • the invention further relates to a method for producing the fiberboard and the use thereof.
  • Wood fiber boards are made from wood fibers or lignocellulose-containing fiber material.
  • the raw material containing lignin, cellulose and hemicellulose is broken down into its fibrous, anatomical basic elements in the form of individual fibers and fiber bundles by the action of heat, moisture and mechanical pressure forces in fiberizing plants.
  • the fiber material is shaped, compressed and pressed.
  • the matting of the fibers and the natural binding power are primarily used.
  • hard wood fiber boards with a bulk density of more than 800 kg / m3, medium-hard wood fiber boards with a bulk density of more than 350 kg / m3 to 800 kg / m3 and porous wood fiber boards with a bulk density of 230 - 350 kg / m3 are distinguished .
  • the production of wood fiber boards is well known and includes the preparation of the raw material and the production of the wood chips, the pretreatment by steaming, cooking or impregnation with lye, the fiber removal, the wet or dry preparation of the fibers and subsequently in particular the formation of a fiber mat, the hot pressing in a wet or dry press and post-treatments, especially thermal curing (see Ullmann's Encyclopedia of Industrial Chemistry, loc. cit., page 720 ff.).
  • Wood fiber hardboards are used especially for used the construction of sub-roof structures that are impervious to meteoric water, and so far for so-called cold-roof constructions according to FIG. It would, however, be desirable to be able to use hardwood fibreboards even in so-called warm roof constructions according to FIG. 2, in which there is no ventilation space and the fibreboard 3 lies directly on the thermal insulation layer.
  • the problem of condensation between the thermal insulation layer and the wood fiber board arises, which cannot be solved satisfactorily with conventional hard boards.
  • the invention is therefore based on the object of providing a wood fiber board which can be used like a conventional wood fiber hard board, but by means of which the condensation problem can be controlled in all construction applications, but in particular in the under-roof area.
  • a wood fiber board which is characterized by a layer structure with an essentially water-impermeable wood fiber hard board layer, and with at least one adjoining second layer of wood fiber material, which is designed to absorb water.
  • the water-absorbing layer is preferably thicker than the essentially water-impermeable layer. On the one hand, this results in a high water absorption capacity and water storage capacity of the wood fiber board. On the other hand, the vapor diffusion resistance of the essentially watertight layer, owing to its small thickness, is considerably lower than in the case of a hardboard made of wood fiber with a total thickness similar to that of the wood fiber board according to the invention; This enables the plate to achieve vapor diffusion resistance values of less than 50, whereas the values for conventional plates are usually in the range from 80 to 120.
  • this rough panel side faces the thermal insulation layer, which has not been the case to date since the rough side, as the anti-slip side, has been laid as the under-roof top.
  • the other, previously smooth board side is now also provided with an anti-slip embossed pattern.
  • a method for producing the wood fiber board according to the invention is characterized in accordance with claim 7.
  • the wood fiber board is used according to claim 10.
  • FIG. 1 shows schematically the structure of a cold roof construction with wood fiber hardboard as a sub-roof.
  • a battens 9 and a vapor barrier 8 are connected to the ceiling 10 on the room side.
  • the thermal insulation 2 is arranged between the rafters 1, and above this a ventilation space 4 is provided in order to remove moisture which cannot be adequately absorbed and dissipated by the conventional wood fiber hard boards which form the sub-roof 3.
  • This inadequate moisture absorption or vapor diffusion ability which requires the space-consuming ventilation space, still becomes worsened by the fact that the conventional panels have a smooth side and a rough side (which results from the finely perforated sieve plate during pressing) and must be installed with the smooth side pointing towards the thermal insulation 2 for safety reasons (risk of slipping).
  • the counter battens 5, the brick battens 6 and the tiles 7 follow on the subroof 3.
  • FIG. 2 The preferred, space-saving warm roof construction is shown schematically in FIG. 2, the same reference numerals showing the same components as in FIG. 1.
  • the ventilation space 4 is not provided in the warm roof. This means that the steam diffusing through the roof, which - depending on the outside and inside temperature - can cool down and possibly condense above the thermal insulation 2, can initially be absorbed and stored by the panels of the sub-roof 3 and let through as water vapor.
  • FIG. 3 shows a sectional view of a wood fiber board 30 with two layers.
  • the less thick layer 32 is constructed like a conventional hardboard, i.e. this layer consists of short fibers or short bundles of fine fibers.
  • This dense hardboard is already relatively good water repellent.
  • a hydrophobizing agent can be added to this layer during manufacture; Paraffin, in particular, is known and harmless to building biology.
  • the thicker layer 31 is e.g. constructed like a conventional medium-hard (also called semi-hard) fibreboard.
  • This layer consists of long fiber bundles of fine fiberisation, which expand again after production after pressing and form a layer with a relatively large number of pores and good water absorption and storage capacity.
  • Another layer e.g. with the properties of a porous fibreboard for applications under extremely humid conditions is conceivable.
  • This pattern or the resulting roughness of the surface leads to a substantially enlarged surface which is effective for the absorption of water.
  • this rough side is laid against the thermal insulation, contrary to the usual installation practice. This has not been done so far, since the rough side was used as an anti-slip side as the outside of the sub-roof.
  • the other side of the board, which was previously smooth, is therefore preferably embossed with an anti-slip pattern.
  • a pattern can result as indicated in FIG. 3 by 34 and shown schematically in FIG. 4b with depressions and elevations 11, 12 which, when used as a sub-roof, enable the latter to be walked on safely.
  • the plate thickness is preferably chosen to be approximately 6 mm, the denser layer 32 being approximately 1 mm thick in the two-layer variant and the other layer 31 being approximately 5 mm thick. This results in good vapor permeability, a large water storage capacity and a good seal against meteor water.
  • a non-woven fabric can first be formed in a known manner, which corresponds to the layer 31 after pressing, that is to say a non-woven fabric which corresponds to a medium-hard fiber board.
  • a second fleece is then applied to this fleece, which corresponds to the layer 32 after pressing, that is to say it is designed to form a hard wood fiber board.
  • the two lying on top of each other Nonwovens are then fed to the pressing process, the nonwoven which forms layer 31 preferably resting on the screen press plate.
  • the other press plate is structured to form the anti-slip surface 34.
  • the wood fiber board is treated in a known manner.
  • the wood fiber board described forms a biologically harmless product, which is on the one hand weatherproof and on the other hand water-absorbing and water-storing. Thanks to the deep vapor diffusion resistance, the absorbed water can be released into the environment. Due to these properties, the fibreboard is ideally suited as a construction element for sub-roofs in warm roofs.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)
  • Artificial Filaments (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

The wood-fibre board (30) is of a two-layered construction. One layer (32) corresponds in its structure to a wood-fibre hardboard and is relatively water-repellent. The other layer (31) corresponds in its structure to a medium-hard wood-fibre board and is water-absorbent and water-retaining. The wood-fibre board is suitable in particular for an under roof in the case of a non-ventilated flat roof construction, in order to absorb any condensate occurring. <IMAGE>

Description

Die Erfindung betrifft eine Holzfaserplatte. Ferner betrifft die Erfindung ein verfahren zur Herstellung der Holzfaserplatte und eine Verwendung derselben.The invention relates to a wood fiber board. The invention further relates to a method for producing the fiberboard and the use thereof.

Holzfaserplatten werden aus Holzfasern oder lignocellulose-haltigem Fasermaterial hergestellt. Durch Einwirkung von Wärme, Feuchtigkeit und mechanischer Druckkräfte in Zerfaserungsanlagen wird das Lignin, Cellulose und Hemicellulose enthaltende Rohmaterial in seine faserartigen, anatomischen Grundelemente in der Form von Einzelfasern und Faserbündel zerlegt. Im Verlauf des Herstellprozesses wird das Fasermaterial geformt, verdichtet und gepresst. Hierbei wird primär die Verfilzung der Fasern und die natürliche Bindekraft genutzt. (Ullmanns Encyclopädie der technischen Chemie, 4. Auflage, Weinheim, New York, 1976, Band 12, Seite 720).Wood fiber boards are made from wood fibers or lignocellulose-containing fiber material. The raw material containing lignin, cellulose and hemicellulose is broken down into its fibrous, anatomical basic elements in the form of individual fibers and fiber bundles by the action of heat, moisture and mechanical pressure forces in fiberizing plants. In the course of the manufacturing process, the fiber material is shaped, compressed and pressed. Here the matting of the fibers and the natural binding power are primarily used. (Ullmann's Encyclopedia of Technical Chemistry, 4th edition, Weinheim, New York, 1976, Volume 12, page 720).

Nach DIN 68 735 werden insbesondere harte Holzfaserplatten mit einer Rohdichte von mehr als 800 kg/m³, mittelharte Holzfaserplatten mit einer Rohdichte von mehr als 350 kg/m³ bis 800 kg/m³ und poröse Holzfaserplatten mit einer Rohdichte von 230 - 350 kg/m³ unterschieden.According to DIN 68 735, hard wood fiber boards with a bulk density of more than 800 kg / m³, medium-hard wood fiber boards with a bulk density of more than 350 kg / m³ to 800 kg / m³ and porous wood fiber boards with a bulk density of 230 - 350 kg / m³ are distinguished .

Die Herstellung von Holzfaserplatten ist wohlbekannt und beinhaltet die Aufbereitung des Rohmaterials und die Herstellung der Hackschnitzel, das Vorbehandeln durch Dämpfen, Kochen oder Imprägnieren mit Laugen, das Zerfasern, die nasse oder trockene Aufbereitung der Fasern und nachfolgend insbesondere die Bildung einer Fasermatte, das Heisspressen in einer Nass- oder Trockenpresse und Nachbehandlungen, insbesondere die thermische Härtung (vgl. Ullmanns Encyclopädie der technischen Chemie, a.a.O., Seite 720 ff.).The production of wood fiber boards is well known and includes the preparation of the raw material and the production of the wood chips, the pretreatment by steaming, cooking or impregnation with lye, the fiber removal, the wet or dry preparation of the fibers and subsequently in particular the formation of a fiber mat, the hot pressing in a wet or dry press and post-treatments, especially thermal curing (see Ullmann's Encyclopedia of Industrial Chemistry, loc. cit., page 720 ff.).

Holzfaser-Hartplatten werden insbesondere für den Aufbau von gegen Meteorwasser dichten Unterdachkonstruktionen verwendet und zwar bis anhin für sogenannte Kaltdachkonstruktionen gemäss Figur 1, bei welchen zwischen der Wärmedämmung 2 und dem über den Sparren 1 liegenden Unterdach 3 ein Belüftungsraum 4 vorgesehen ist. Es wäre indes wünschenswert, Holzfaser-Hartplatten auch bei sogenannten Warmdachkonstruktionen gemäss Figur 2 einsetzen zu können, bei welchen kein Belüftungsraum vorhanden ist und die Holzfaserplatte 3 direkt auf der Wärmedämmschicht aufliegt. Dabei stellt sich indes das Problem der Kondenswasserbildung zwischen der Wärmedämmschicht und der Holzfaserplatte, was mit herkömmlichen Hartplatten nicht befriedigend gelöst werden kann.Wood fiber hardboards are used especially for used the construction of sub-roof structures that are impervious to meteoric water, and so far for so-called cold-roof constructions according to FIG. It would, however, be desirable to be able to use hardwood fibreboards even in so-called warm roof constructions according to FIG. 2, in which there is no ventilation space and the fibreboard 3 lies directly on the thermal insulation layer. However, the problem of condensation between the thermal insulation layer and the wood fiber board arises, which cannot be solved satisfactorily with conventional hard boards.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Holzfaserplatte zu schaffen, die wie eine herkömmliche Holzfaser-Hartplatte angewendet werden kann, mittels deren aber das Kondenswasserproblem bei allen Bauanwendungen, insbesondere aber im Unterdachbereich beherrschbar ist.The invention is therefore based on the object of providing a wood fiber board which can be used like a conventional wood fiber hard board, but by means of which the condensation problem can be controlled in all construction applications, but in particular in the under-roof area.

Dies wird mit einer Holzfaserplatte erreicht, die gekennzeichnet ist durch einen Schichtaufbau mit einer im wesentlichen wasserundurchlässigen Holzfaser-Hartplattenschicht, und mit mindestens einer daran anschliessenden zweiten Schicht aus Holzfasermaterial, die wasseraufnehmend ausgestaltet ist.This is achieved with a wood fiber board, which is characterized by a layer structure with an essentially water-impermeable wood fiber hard board layer, and with at least one adjoining second layer of wood fiber material, which is designed to absorb water.

Vorzugsweise ist die wasseraufnehmende Schicht dicker als die im wesentlichen wasserundurchlässige Schicht. Dadurch ergibt sich einerseits eine grosse Wasseraufnahmefähigkeit und Wasserspeicherfähigkeit der Holzfaserplatte. Andererseits ist der Dampfdiffusionswiderstand der im wesentlichen wasserdichten Schicht aufgrund deren geringen Dicke wesentlich tiefer als bei einer Holzfaser-Hartplatte von ähnlicher Gesamtdicke wie die erfindungsgemässe Holzfaserplatte; so lassen sich Dampfdiffusionswiderstandswerte der Platte von unter 50 erzielen, während die Werte bei herkömmlichen Platten in der Regel im Bereich von 80 bis 120 liegen.The water-absorbing layer is preferably thicker than the essentially water-impermeable layer. On the one hand, this results in a high water absorption capacity and water storage capacity of the wood fiber board. On the other hand, the vapor diffusion resistance of the essentially watertight layer, owing to its small thickness, is considerably lower than in the case of a hardboard made of wood fiber with a total thickness similar to that of the wood fiber board according to the invention; This enables the plate to achieve vapor diffusion resistance values of less than 50, whereas the values for conventional plates are usually in the range from 80 to 120.

Bei einer bevorzugten Ausführungsart ist die wasseraufnehmende Oberfläche der Holzfaserplatte mit der für Holzfaserplatten charakteristischen, von der Siebpressplatte bei der Herstellung stammenden, Oberflächenrauhigkeit versehen. Dadurch wird die aktive, wasseraufnehmende Oberfläche wesentlich vergrössert. Bei einer bevorzugten Anwendung als Unterdachplatte bei einem Warmdach wird diese rauhe Plattenseite der Wärmedämmschicht zugewandt, was bisher nicht der Fall gewesen ist, da die rauhe Seite, als die rutschhemmende Seite, als Unterdachoberseite verlegt worden ist. Bei einer bevorzugten Ausführung der Holzfaserplatte ist daher nun auch die andere, bisher jeweils glatte Plattenseite mit einem rutschhemmenden Prägemuster versehen.In a preferred embodiment, the Provide the water-absorbing surface of the fibreboard with the surface roughness that is characteristic of wood fiberboard and comes from the screen press plate during manufacture. This significantly increases the active, water-absorbing surface. In a preferred application as an under-roof panel in a warm roof, this rough panel side faces the thermal insulation layer, which has not been the case to date since the rough side, as the anti-slip side, has been laid as the under-roof top. In a preferred embodiment of the wood fiber board, the other, previously smooth board side is now also provided with an anti-slip embossed pattern.

Ein Verfahren zur Herstellung der erfindungsgemässen Holzfaserplatte ist gemäss Anspruch 7 gekennzeichnet. Eine Verwendung der Holzfaserplatte erfolgt gemäss Anspruch 10.A method for producing the wood fiber board according to the invention is characterized in accordance with claim 7. The wood fiber board is used according to claim 10.

Im folgenden sollen Ausführungsbeispiele anhand der Figuren näher erläutert werden. Dabei zeigt

  • Figur 1 schematisch eine perspektivische Ansicht einer Kaltdachkonstruktion;
  • Figur 2 schematisch eine perspektivische Ansicht einer Warmdachkonstruktion;
  • Figur 3 einen schematischen Vertikalschnitt durch die Holzfaser-Hartplatte;
  • Figuren 4a und 4b die Oberflächenstrukturen der beiden Plattenflächen.
Exemplary embodiments are to be explained in more detail below with reference to the figures. It shows
  • Figure 1 schematically shows a perspective view of a cold roof construction;
  • Figure 2 schematically shows a perspective view of a warm roof construction;
  • Figure 3 is a schematic vertical section through the wood fiber hardboard;
  • Figures 4a and 4b, the surface structures of the two plate surfaces.

Figur 1 zeigt schematisch den Aufbau einer Kaltdachkonstruktion mit Holzfaser-Hartplatten als Unterdach. An die raumseitige Decke 10 schliesst eine Lattung 9 und eine Dampfbremse 8 an. Zwischen den Sparren 1 ist die Wärmedämmung 2 angeordnet, und über dieser ist ein Belüftungsraum 4 vorgesehen, um Feuchtigkeit abzuführen, welche von den herkömmlichen Holzfaser-Hartplatten, die das Unterdach 3 bilden, nicht genügend aufgenommen und abgeführt werden kann. Diese ungenügende Feuchtigkeitsaufnahme bzw. Dampfdiffusionsfähigkeit, die den platzraubenden Belüftungsraum bedingt, wird noch dadurch verschlechtert, dass die herkömmlichen Platten eine glatte Seite und eine rauhe Seite aufweisen (die sich beim Pressen aus der feingelochten Siebplatte ergibt) und aus Sicherheitsgründen (Rutschgefahr) mit der glatten Seite gegen die Wärmedämmung 2 hin weisend verlegt werden müssen. Auf das Unterdach 3 folgen die Konterlatten 5, die Ziegellatten 6 und die Ziegel 7.Figure 1 shows schematically the structure of a cold roof construction with wood fiber hardboard as a sub-roof. A battens 9 and a vapor barrier 8 are connected to the ceiling 10 on the room side. The thermal insulation 2 is arranged between the rafters 1, and above this a ventilation space 4 is provided in order to remove moisture which cannot be adequately absorbed and dissipated by the conventional wood fiber hard boards which form the sub-roof 3. This inadequate moisture absorption or vapor diffusion ability, which requires the space-consuming ventilation space, still becomes worsened by the fact that the conventional panels have a smooth side and a rough side (which results from the finely perforated sieve plate during pressing) and must be installed with the smooth side pointing towards the thermal insulation 2 for safety reasons (risk of slipping). The counter battens 5, the brick battens 6 and the tiles 7 follow on the subroof 3.

Die bevorzugte, platzsparende Warmdachkonstruktion ist in Figur 2 schematisch gezeigt, wobei gleiche Bezugsziffern gleiche Bauteile wie in Figur 1 zeigen. Der Belüftungsraum 4 ist hingegen beim Warmdach nicht vorgesehen. Dies bedingt, dass der durch das Dach diffundierende Dampf, der - je nach Aussen- und Innentemperatur - oberhalb der Wärmedämmung 2 wesentlich abkühlen und eventuell kondensieren kann, von den Platten des Unterdaches 3 zunächst aufgenommen und gespeichert und als Wasserdampf durchgelassen werden kann.The preferred, space-saving warm roof construction is shown schematically in FIG. 2, the same reference numerals showing the same components as in FIG. 1. The ventilation space 4, however, is not provided in the warm roof. This means that the steam diffusing through the roof, which - depending on the outside and inside temperature - can cool down and possibly condense above the thermal insulation 2, can initially be absorbed and stored by the panels of the sub-roof 3 and let through as water vapor.

Figur 3 zeigt eine Schnittansicht einer Holzfaserplatte 30 mit zwei Schichten. Die weniger dicke Schicht 32 ist dabei so aufgebaut wie eine herkömmliche Holzfaser-Hartplatte, d.h. diese Schicht besteht aus kurzen Fasern bzw. kurzen Faserbündeln feiner Zerfaserung. Diese dichte Holzfaser-Hartplatte ist bereits an sich relativ gut wasserabweisend. Um diese Eigenschaft zu verbessern kann dieser Schicht bei der Herstellung ein Hydrophobiermittel zugesetzt werden; bekannt und baubiologisch unbedenklich ist dazu insbesondere Paraffin.FIG. 3 shows a sectional view of a wood fiber board 30 with two layers. The less thick layer 32 is constructed like a conventional hardboard, i.e. this layer consists of short fibers or short bundles of fine fibers. This dense hardboard is already relatively good water repellent. In order to improve this property, a hydrophobizing agent can be added to this layer during manufacture; Paraffin, in particular, is known and harmless to building biology.

Die dickere Schicht 31 ist z.B. so aufgebaut wie eine herkömmliche mittelharte (auch als halbharte bezeichnete) Holzfaserplatte. Diese Schicht besteht aus langen Faserbündeln feiner Zerfaserung, die sich bei der Herstellung nach dem Pressen wieder ausdehnen und eine Schicht mit relativ vielen Poren und guter Wasseraufnahme und -speicherfähigkeit bildet. Auch eine weitere Schicht, z.B. mit den Eigenschaften einer porösen Holzfaserplatte für Anwendungen unter extrem feuchten Bedingungen, ist denkbar.The thicker layer 31 is e.g. constructed like a conventional medium-hard (also called semi-hard) fibreboard. This layer consists of long fiber bundles of fine fiberisation, which expand again after production after pressing and form a layer with a relatively large number of pores and good water absorption and storage capacity. Another layer, e.g. with the properties of a porous fibreboard for applications under extremely humid conditions is conceivable.

Vorteilhaft ist es, wenn die Oberfläche 33 der Platte 30, die von der wasseraufnehmenden Schicht 31 gebildet wird, bei der Herstellung auf der Siebpressplatte aufliegt und mit dem dafür charakteristischen Muster versehen wird, wie es in Figur 4a schematisch angedeutet ist. Dieses Muster bzw. die sich daraus ergebende Rauheit der Oberfläche führt zu einer wesentlich vergrösserten Oberfläche, die für die Aufnahme von Wasser wirksam ist. Bei der Verwendung einer solchen Holzfaserplatte als Unterdachkonstruktionselement wird neu, entgegen der üblichen Verlegepraxis, diese rauhe Seite gegen die Wärmedämmung hin weisend verlegt. Dies wurde bis anhin nicht derart ausgeführt, da die rauhe Seite als rutschhemmende Seite als Aussenseite des Unterdaches verwendet wurde. Bei der erfindungsgemässen Holzfaserplatte wird daher bevorzugterweise die andere, bisher glatte Plattenseite mit einem rutschhemmenden Muster geprägt. Dies vorzugsweise bei der Herstellung, indem zur Pressung dieser Plattenseite eine entsprechend mit Prägemustern versehene Pressplatte verwendet wird. Es kann sich ein Muster ergeben wie in Figur 3 mit 34 bezeichnet und schematisch in Figur 4b mit Vertiefungen und Erhöhungen 11, 12 dargestellt, welche bei der Anwendung als Unterdach ein gefahrloses Begehen desselben ermöglichen.It is advantageous if the surface 33 the plate 30, which is formed by the water-absorbing layer 31, rests on the screen press plate during production and is provided with the characteristic pattern therefor, as is schematically indicated in FIG. 4a. This pattern or the resulting roughness of the surface leads to a substantially enlarged surface which is effective for the absorption of water. When using such a fibreboard as a sub-roof construction element, this rough side is laid against the thermal insulation, contrary to the usual installation practice. This has not been done so far, since the rough side was used as an anti-slip side as the outside of the sub-roof. In the case of the wood fiber board according to the invention, the other side of the board, which was previously smooth, is therefore preferably embossed with an anti-slip pattern. This is preferably done during production by using a corresponding press plate provided with embossing patterns to press this plate side. A pattern can result as indicated in FIG. 3 by 34 and shown schematically in FIG. 4b with depressions and elevations 11, 12 which, when used as a sub-roof, enable the latter to be walked on safely.

Vorzugsweise wird die Plattendicke ca. 6 mm gewählt, wobei bei der Zweischichtvariante die dichtere Schicht 32 ca. 1 mm dick ist und die andere Schicht 31 ca. 5 mm dick ist. Damit ergibt sich eine gute Dampfdurchlässigkeit, ein grosses Wasserspeichervermögen und eine gute Dichtigkeit gegen Meteorwasser.The plate thickness is preferably chosen to be approximately 6 mm, the denser layer 32 being approximately 1 mm thick in the two-layer variant and the other layer 31 being approximately 5 mm thick. This results in good vapor permeability, a large water storage capacity and a good seal against meteor water.

Bei der Herstellung der Holzfaserplatte kann zunächst auf bekannte Weise ein Faservlies gebildet werden, welches nach dem Pressen der Schicht 31 entspricht, also ein Vlies, welches einer mittelharten Faserplatte entspricht. Auf dieses Vlies wird dann ein zweites Vlies aufgebracht, welches nach dem Pressen der Schicht 32 entspricht, also zur Bildung einer Holzfaser-Hartplatte ausgeführt ist. Die beiden aufeinanderliegenden Vliesse werden dann dem Pressvorgang zugeführt, wobei bevorzugt das Vlies, welches die Schicht 31 bildet, auf der Siebpressplatte aufliegt. Die andere Pressplatte ist, wie erwähnt, zur Bildung der rutschhemmenden Oberfläche 34 strukturiert. Nach dem Pressen wird die Holzfaserplatte auf bekannte Weise nachbehandelt.In the production of the wood fiber board, a non-woven fabric can first be formed in a known manner, which corresponds to the layer 31 after pressing, that is to say a non-woven fabric which corresponds to a medium-hard fiber board. A second fleece is then applied to this fleece, which corresponds to the layer 32 after pressing, that is to say it is designed to form a hard wood fiber board. The two lying on top of each other Nonwovens are then fed to the pressing process, the nonwoven which forms layer 31 preferably resting on the screen press plate. As mentioned, the other press plate is structured to form the anti-slip surface 34. After pressing, the wood fiber board is treated in a known manner.

Die beschriebene Holzfaserplatte bildet ein baubiologisch unbedenkliches Produkt, das einerseits meteorwasserfest ist und andererseits wasseraufnehmend und wasserspeichernd. Dank des tiefen Dampfdiffusionswiderstandes kann das aufgenommene Wasser gut an die Umgebung abgegeben werden. Die Holzfaserplatte eignet sich aufgrund dieser Eigenschaften ausgezeichnet als Konstruktionselement für Unterdächer bei Warmdächern.The wood fiber board described forms a biologically harmless product, which is on the one hand weatherproof and on the other hand water-absorbing and water-storing. Thanks to the deep vapor diffusion resistance, the absorbed water can be released into the environment. Due to these properties, the fibreboard is ideally suited as a construction element for sub-roofs in warm roofs.

Claims (11)

Holzfaserplatte (30), gekennzeichnet durch einen Schichtaufbau mit einer im wesentlichen wasserundurchlässigen Holzfaser-Hartplattenschicht (32), und mit mindestens einer daran anschliessenden zweiten Schicht (31) aus Holzfasermaterial, die wasseraufnehmend ausgestaltet ist.Wood fiber board (30), characterized by a layer structure with an essentially water-impermeable wood fiber hard board layer (32), and with at least one adjoining second layer (31) made of wood fiber material, which is designed to absorb water. Holzfaserplatte nach Anspruch 1, dadurch gekennzeichnet, dass die wasseraufnehmende Schicht als Schicht entsprechend einer mittelharten Holzfaserplatte ausgeführt ist.Wood fiber board according to claim 1, characterized in that the water-absorbing layer is designed as a layer corresponding to a medium hard wood fiber board. Holzfaserplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die von der wasseraufnehmenden Schicht (31) gebildete Oberfläche (33) der Holzfaserplatte (30) mit einer die Oberfläche vergrössernden Prägung versehen ist.Wood fiber board according to claim 1 or 2, characterized in that the surface (33) of the wood fiber board (30) formed by the water-absorbing layer (31) is provided with an embossing which increases the surface area. Holzfaserplatte nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass die wasseraufnehmende Schicht (31) dicker als die im wesentlichen wasserundurchlässige Schicht (32) ist.Wood fiber board according to one of claims 1-3, characterized in that the water-absorbing layer (31) is thicker than the substantially water-impermeable layer (32). Holzfaserplatte nach Anspruch 4, dadurch gekennzeichnet, dass die die Holzfaserplatte eine Gesamtdicke von ca. 6 mm aufweist, wobei die Holzfaser-Hartplattenschicht ca. 1 mm dick ist und die wasseraufnehmende Schicht ca. 5 mm dick ist.Wood fiber board according to claim 4, characterized in that the wood fiber board has a total thickness of approximately 6 mm, the wood fiber hard board layer being approximately 1 mm thick and the water-absorbing layer being approximately 5 mm thick. Holzfaserplatte nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die von der Holzfaser-Hartplattenschicht (32) gebildete Oberfläche der Holzfaserplatte (30) mit einer rutschhemmenden Prägung (11, 12) versehen ist.Wood fiber board according to one of claims 1 to 5, characterized in that the surface of the wood fiber board (30) formed by the wood fiber hard board layer (32) is provided with an anti-slip embossing (11, 12). Verfahren zur Herstellung einer Holzfaserplatte nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass auf eine erste Fasermatte, die zur Bildung einer mittelharten Holzfaserplatte vorgesehen ist, eine zweite Fasermatte, die zur Bildung einer harten Holzfaserplatte vorgesehen ist, aufgebracht wird, wonach die beiden Fasermatten zusammen dem Pressvorgang unterzogen werden.Method for producing a wood fiber board according to one of claims 1 to 6, characterized in that on a first fiber mat, which is provided to form a medium-hard wood fiber board, a second fiber mat, which is used to form a hard Wood fiber board is provided, is applied, after which the two fiber mats are subjected to the pressing process together. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass beim Pressvorgang die erste Fasermatte auf der Siebpressplatte aufliegt.A method according to claim 7, characterized in that the first fiber mat rests on the screen press plate during the pressing process. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die zweite Fasermatte beim Pressen an einer Pressplatte aufliegt, die mit einem Prägemuster versehen ist.A method according to claim 7 or 8, characterized in that the second fiber mat during pressing rests on a press plate which is provided with an embossing pattern. Verwendung von Holzfaserplatten nach einem der Ansprüche 1 bis 6 zum Aufbau eines Unterdaches.Use of wood fiber boards according to one of claims 1 to 6 for the construction of a sub-roof. Verwendung nach Anspruch 10, dadurch gekennzeichnet, dass das Unterdach als Warmdachkonstruktion mit auf der Wärmedämmung aufliegenden Holzfaserplatten gebildet ist, wobei die wasseraufnehmende Plattenschicht auf der Dämmung aufliegt.Use according to claim 10, characterized in that the sub-roof is formed as a warm roof construction with wood fiber boards resting on the thermal insulation, the water-absorbing board layer resting on the insulation.
EP92105877A 1991-06-14 1992-04-04 Wood-fiber-board, method for its production and use of the same Expired - Lifetime EP0518017B2 (en)

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Application Number Priority Date Filing Date Title
CH177391 1991-06-14
CH1773/91 1991-06-14

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EP0518017B1 EP0518017B1 (en) 1995-01-25
EP0518017B2 EP0518017B2 (en) 1998-09-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4430937A1 (en) * 1994-08-31 1996-03-07 Kurprinz Georg Keil Gmbh Unter Light environment friendly wood-based insulation board needing no glue
FR2758149A1 (en) * 1997-01-03 1998-07-10 Sarl Soveco Reunion Insulated sloping roof covering with rain barrier
DE102016101669A1 (en) * 2016-01-29 2017-08-03 Saint-Gobain Isover G+H Ag Soft wood fiber insulation board for thermal and / or acoustic insulation

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Publication number Priority date Publication date Assignee Title
GB711659A (en) * 1951-05-05 1954-07-07 Capuana Per L Ind Della Lignoc Process for manufacturing wood fibre panels
DE1900053A1 (en) * 1969-01-02 1970-08-13 Eugen Siempelkamp Plant for the production of chipboard, fiberboard and the like.
DE3322375A1 (en) * 1983-06-22 1985-01-03 Karl 5249 Hamm Rische Sound-proofing and heat-insulating panel and process for the manufacture thereof
DE3437446A1 (en) * 1983-10-24 1985-05-02 Leganorm AG, Winterthur Insulating element for a heat-insulating and sound-insulating sub-roof
EP0186503A1 (en) * 1984-12-28 1986-07-02 Forintek Canada Corp. Improved method of making dimensionally stable composite board

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB711659A (en) * 1951-05-05 1954-07-07 Capuana Per L Ind Della Lignoc Process for manufacturing wood fibre panels
DE1900053A1 (en) * 1969-01-02 1970-08-13 Eugen Siempelkamp Plant for the production of chipboard, fiberboard and the like.
DE3322375A1 (en) * 1983-06-22 1985-01-03 Karl 5249 Hamm Rische Sound-proofing and heat-insulating panel and process for the manufacture thereof
DE3437446A1 (en) * 1983-10-24 1985-05-02 Leganorm AG, Winterthur Insulating element for a heat-insulating and sound-insulating sub-roof
EP0186503A1 (en) * 1984-12-28 1986-07-02 Forintek Canada Corp. Improved method of making dimensionally stable composite board

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4430937A1 (en) * 1994-08-31 1996-03-07 Kurprinz Georg Keil Gmbh Unter Light environment friendly wood-based insulation board needing no glue
FR2758149A1 (en) * 1997-01-03 1998-07-10 Sarl Soveco Reunion Insulated sloping roof covering with rain barrier
DE102016101669A1 (en) * 2016-01-29 2017-08-03 Saint-Gobain Isover G+H Ag Soft wood fiber insulation board for thermal and / or acoustic insulation

Also Published As

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EP0518017B1 (en) 1995-01-25
ATE117619T1 (en) 1995-02-15
DE59201260D1 (en) 1995-03-09
EP0518017B2 (en) 1998-09-23

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