EP4476070A1 - Procédé de fabrication d'un placage stabilisé et placage stabilisé - Google Patents

Procédé de fabrication d'un placage stabilisé et placage stabilisé

Info

Publication number
EP4476070A1
EP4476070A1 EP23705956.3A EP23705956A EP4476070A1 EP 4476070 A1 EP4476070 A1 EP 4476070A1 EP 23705956 A EP23705956 A EP 23705956A EP 4476070 A1 EP4476070 A1 EP 4476070A1
Authority
EP
European Patent Office
Prior art keywords
veneer
layer
stabilized
stabilization
condensation resin
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.)
Pending
Application number
EP23705956.3A
Other languages
German (de)
English (en)
Inventor
Bernd Stiewe
Joachim Hasch
Norbert Kalwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flooring Technologies Ltd
Original Assignee
Flooring Technologies Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Flooring Technologies Ltd filed Critical Flooring Technologies Ltd
Publication of EP4476070A1 publication Critical patent/EP4476070A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/06—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/10—Next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B32B37/1027—Pressing using at least one press band
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/16—Wood, e.g. woodboard, fibreboard, woodchips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B32B2419/04—Tiles for floors or walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2479/00—Furniture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing

Definitions

  • the invention relates to a method for producing a stabilized veneer without a backing board, a stabilized veneer without a backing board and a veneered board.
  • veneers In order to be able to provide customers with products with a real wood surface, veneers have been used for a long time. However, there is the problem with veneers that they tend to break during processing with material thicknesses of less than one millimeter and are correspondingly difficult to process, which frequently leads to material losses and the associated additional costs. Another problem is that such veneers are also very sensitive to mechanical damage because of their small thickness.
  • a known solution from the prior art for improving the processability of a large-format veneer sheet is to glue a stabilizing layer on the back, as is described, for example, in EP 1911580 Ai.
  • this will the resistance of the veneer to selective pressure stresses during processing or later use is still not improved, since the adhesive does not penetrate into the veneer layer.
  • the invention is therefore based on the technical problem of providing a method for producing a veneer and a veneer, the veneer being particularly stable without a carrier plate and in particular having a particularly high mechanical stability with respect to pressure loads, being able to be processed easily and safely as an intermediate product, has a particularly low veneer thickness and is therefore particularly cheap to produce and still has a good real wood look and feel.
  • the object is achieved according to the invention by a method for producing a stabilized veneer according to claim 1, a stabilized veneer according to claim 13 and a veneered board according to claim 14.
  • Advantageous developments of the invention are specified in the dependent claims.
  • the inventive method for producing a stabilized and / or a veneer that can be rolled up without a carrier board and/or as an independent product has as process steps initially providing a stabilization layer, followed by one-sided coating, in particular an upper side, of the stabilization layer with a condensation resin, and then pressing the stabilization layer and the veneer layer to form a stabilization layer by means of the condensation resin, the condensation resin being pressed from the stabilization layer at least partially into the veneer layer when it is pressed, where it leads to hardening or mechanical stabilization of the veneer.
  • the invention relates to a stabilized veneer without a carrier board and/or as an independent product, in particular produced by the method according to the invention, which has a stabilization layer pressed on a back side of the veneer layer and a stabilization layer that extends continuously from the stabilization layer into the back side of the veneer layer and consists of a condensation resin pressed from the stabilization layer into the veneer layer.
  • the invention relates to a veneered board, having a carrier board and a stabilized veneer according to the invention arranged above the carrier board.
  • the inventors have recognized that by introducing a condensation resin into the back of the veneer layer by means of a stabilization layer, the veneer can be mechanically stabilized, in particular against compressive stresses, and that the use of a stabilization layer in combination with the targeted introduction of the condensation resin can over the stabilization layer in the veneer layer extending stabilization layer can be formed, which leads to a significant improvement in the mechanical properties and the processability of the isolated veneer.
  • This makes it possible to use a particularly thin layer of veneer and thus to keep the production and product costs of the stabilized veneer low.
  • the front and thus the wood surface of the stabilized veneer remains unchanged and natural by pressing the condensation resin into the veneer layer from the back, so that an unchanged wood surface look and feel is achieved.
  • the variability of the processing is increased by the solution according to the invention, since the stabilized veneer is typically rolled cash and can be stored, used and further processed accordingly as roll goods.
  • the stabilized veneer according to the invention is a layered material or a composite material which is formed from at least two layers, the veneer layer and the stabilizing layer.
  • these two layers are preferably inseparably connected to one another in the finished veneer.
  • the veneer according to the invention is produced without a carrier board and/or as an independent product and/or independently of a subsequent setting on any desired surface.
  • the stabilized veneer has no backing board.
  • the solid surface or a component with a solid surface that is to be modified by the application of the veneer is understood as the carrier plate.
  • a stabilized veneer without a carrier board is not a veneered furniture board and not a veneered floor panel, not a veneered wall panel and not a veneered ceiling panel.
  • the stabilized veneer preferably has only the veneer layer and a stabilizing layer as layers or as material layers. In principle, however, further layers or plies, in particular transparent layers such as a lacquer coating, can be provided on the veneer layer.
  • the stabilized veneer according to the invention is still a veneer for applying and finishing a material surface and not a surface of another object already provided with a veneer. Accordingly, the stabilized veneer is an independent product that is produced individually and can be stored and handled independently of a carrier or a carrier board and, in particular, does not have to be directly stabilized by a carrier board. This represents a significant advantage of the invention, since hitherto corresponding veneers connected to a stabilization layer were always connected to a carrier board at the same time and the veneer was therefore not available as an independent product for further applications.
  • the stabilized veneer is designed to be placed on and bonded to a surface to modify the surface.
  • the stabilization layer preferably extends over the entire surface of the stabilized veneer and/or has an essentially constant thickness over the entire surface. Furthermore, the stabilization layer preferably has a constant composition and/or the same mechanical properties over the entire surface.
  • the stabilization layer is also preferably bendable, rollable and/or flexible.
  • the stabilization layer is preferably not made of wood and/or a wood material.
  • the stabilization layer is particularly preferably provided exclusively for stabilizing the veneer and particularly preferably does not form a structure of a piece of furniture, a furniture construction board, another board material or a panel, in particular for arrangement on the ceiling, a wall and/or the floor.
  • the stabilization layer is provided for one-sided coating with a condensation resin, the stabilization layer preferably being formed in such a way that the condensation resin used up on the surface of the stabilization layer can at least partially penetrate into the stabilization layer.
  • the one-sided coating can be done in any way. It is possible to apply the condensation resin immediately before further use or to apply and then saturate the stabilization layer.
  • the coating can take place either by means of a liquid condensation resin or by any application of a solid.
  • the stabilization layer can also be formed in such a way that little or no condensation resin can penetrate, so that the condensation resin is preferably applied exclusively to the surface during coating and, particularly preferably, the condensation resin does not subsequently penetrate into the stabilization layer and/or cannot saturate it .
  • any suitable liquid-resistant or liquid-impermeable stabilizing layer can be used for this purpose, the use of parchment paper is particularly preferred for this purpose.
  • a likewise particularly preferred embodiment further provides that a biocomposite material based on cellulose and in particular vulcanized fiber or vulkament is used as the stabilizing layer. As a result, a biocomposite material with a veneer layer, in particular with a real wood veneer surface, is obtained in an advantageous manner.
  • the coating preferably takes place as a liquid coating, in particular directly onto the surface of the stabilization layer.
  • the back of the stabilization layer ie the surface of the stabilization layer facing away from the veneer layer, has no coating with condensation resin and/or no outer layer formed exclusively of condensation resin during production of the stabilized veneer and/or in the case of the stabilized veneer.
  • a preferred embodiment of the method according to the invention provides that a side of the stabilization layer opposite the coated side is free of a coating with the condensation resin.
  • the underside of the stabilization layer is preferably provided with no synthetic resin and/or no adhesive at least before and/or during the pressing.
  • the stabilization layer is arranged on a back side of a veneer layer and pressed with it.
  • the back of a veneer layer is preferably the side of the veneer layer that is opposite the surface of the finished, stabilized veneer.
  • the front side of the veneer sheet is intended to form the surface of the stabilized veneer and/or remain visible.
  • a layer of real wood is preferably used as the veneer layer, which in principle can initially have any thickness, thicknesses between 0.5 mm and 10 mm being common for veneers in general. Due to the stabilization with the condensation resin, however, significantly lower layer thicknesses are possible.
  • the veneer can be made in one piece from a log by slicing or peeling. But it can also be composed of individual pieces z. B. are connected to each other by binders or so-called glue threads.
  • the veneer preferably essentially has the dimensions of the stabilization layer.
  • the joining of the stabilizing layer and the veneer layer for the production of the stabilized veneer is carried out by pressing, whereby the pressing can in principle be carried out statically or dynamically.
  • the pressing results in at least part of the condensation resin being pressed from the stabilization layer or from the surface of the stabilization layer into the veneer layer.
  • the synthetic resin in the press under the influence of increased Ter temperature and increased pressure is liquefied and it subsequently hardens chemically and / or solidifies on cooling.
  • the pressing time is typically between 20 seconds and 60 seconds.
  • the veneer layer preferably has cavities, in particular production-related cracks or gaps and/or cavities typical of wood, e.g. B. by cut vessels.
  • the condensation resin then preferably penetrates into at least some of these cavities during pressing.
  • the condensation resin penetrating into the veneer layer leads to the formation of a stabilization layer which extends through the stabilization layer into the veneer layer and thereby connects both the stabilization layer to the veneer layer and also forms a composite material with the material of the veneer layer, in particular a penetrating composite material.
  • a stabilization layer which extends through the stabilization layer into the veneer layer and thereby connects both the stabilization layer to the veneer layer and also forms a composite material with the material of the veneer layer, in particular a penetrating composite material. which has improved material properties compared to pure wood, for example increased elasticity or flexibility and/or increased mechanical strength and in particular increased compressive strength.
  • the invention provides for a stabilized veneer according to the invention to be arranged on a carrier board and preferably to be glued thereto or to be connected by means of an adhesive or synthetic resin.
  • any plate which is flat on at least one side and forms a permanent connection with an adhesive or a synthetic resin can be used as the carrier plate.
  • Wood-based panels are preferably used, e.g. B. medium-density or high-density fibreboard (MDF, HDF), chipboard, OSB (oriented strand boards), solid wood panels, plywood and block or laminboard, but also cement-bonded chipboard or fibreboard, including fibreboard with a high binder content, as well as bio-composite boards and waterproof Plates are suitable.
  • Waterproof panels are panels, including wood-based panels, that hardly or not at all deform under the action of water, and in particular that do not or hardly swell.
  • the carrier plate has an upper side, on which the veneer is preferably applied, and an underside.
  • the veneered panel has a backing on the underside and/or opposite a veneer, wherein this backing can also be formed by a veneer or a veneer layer and in particular by a stabilized veneer according to the invention.
  • the balancing act is intended to compensate for the tensile forces that are triggered by the shrinkage of the synthetic resin when the adhesive or the synthetic resin hardens on the upper side of the carrier board.
  • the backing can be, for example, a synthetic resin-impregnated paper or a synthetic resin-impregnated cardboard.
  • the condensation resin can be any synthetic resin and is used as a binder.
  • the condensation resin is preferably a thermosetting resin, in particular an aminoplastic or phenol-based resin.
  • melamine resin, phenolic resin, urea resin or mixtures of these resins are used.
  • a melamine-formaldehyde, a urea-formaldehyde and/or a phenol-formaldehyde resin or mixtures of several of these resins is particularly preferably used as the condensation resin.
  • the condensation resin is preferably used as an aqueous solution with a solids content of 50% by weight to 60% by weight, the solids content particularly preferably being the same as the content of synthetic resin or condensation resin.
  • the condensation resin or the synthetic resin is also preferably used in an amount that ensures that the synthetic resin penetrates the veneer at least in sections.
  • the resin is also preferably applied in one step or as the application of precisely one condensation resin or one resin mixture.
  • the condensation resin is a postforming resin and/or is made flexible by means of at least one elastification agent such that the stabilized veneer can be rolled up into a roll after pressing.
  • Flexibility agents that can be used include diols, caprolactam, guanidine derivatives and sugars. Depending on the required degree of flexibility, they are preferably added to the condensation resins, based on the mass of the condensation resin, from 2% to 15% and particularly preferably from 5% to 10%. There is the possibility of adding the flexibilizing agent during the production of the condensation resin or subsequently to the finished condensation resin.
  • the finished veneer is rolled up to form a roll and/or for further processing as rolled goods.
  • the condensation resin contains at least one additive, in particular from the group of hardeners, wetting agents, dyes, pigments, effect pigments, flame retardants, ink, UV stabilizers, infrared absorbers, agents to increase conductivity, antibacterial agents, hydrophobing agents, bleaching agents and/or stains having.
  • a mixture of two or more additives is particularly preferably used.
  • At least one additive, some of the additives or all of the additives can be applied to the stabilization layer and/or introduced into the veneer together with the condensation resin.
  • Each additive can be applied and/or added to the condensation resin both as a particulate solid and in liquid form.
  • the additive can also be in the form of granules.
  • a liquid or pasty additive can be used.
  • each additive can be completely soluble in the condensation resin, although it is preferred that at least one additive is not soluble in the binder or is not homogeneously soluble in the binder.
  • this enables the additive to be used particularly sparingly.
  • a higher concentration of the additive reaches the veneer or the veneer surface in a targeted manner, so that the effect of the respective additive is better guaranteed.
  • a significant advantage of the method according to the invention is that a veneer layer can be used with a particularly small material thickness and is then stabilized in such a way that the mechanical properties are at least comparable with those of a veneer layer of significantly greater material thickness. Accordingly, a preferred embodiment of the method according to the invention provides that the veneer layer has a thickness of less than or equal to 1 mm, preferably between 0.01 mm and 1 mm, particularly preferably between 0.1 mm and 1 mm, very particularly preferably between 0.2 mm and 0.5 mm and in particular less than 0.3 mm .
  • veneer layers and veneers with such a low thickness are very sensitive to mechanical damage and are also very difficult to handle.
  • a veneer layer of such a low thickness only becomes sufficiently mechanically stable through the stabilization layer produced, so that it can also be used with higher demands on the mechanical properties.
  • suitable stabilization allows the veneer produced to be rolled up despite the low material thickness and/or particularly error-free and simple further processing.
  • the pressing is carried out by means of a double belt press or by means of a CPL press, which on the one hand makes it possible to produce a structure of the stabilized veneer with several layers in a simple manner and on the other hand a continuous production of stabilized veneer is possible.
  • a double belt press or dynamic pressing in general makes it possible to produce the stabilized veneer as rolled goods and/or to roll up long sections of the veneer produced after it has been produced.
  • an endless material can be produced in this way, which can also be used in industries in which the processing of rolled goods is common.
  • the pressing can also be carried out using a static press, in particular a short-cycle and/or multi-daylight press.
  • the pressing preferably takes place at an elevated temperature and under pressure.
  • An advantageous development of the method according to the invention provides that the pressing at a pressure between 10 bar and 100 bar, preferably between 10 bar and 70 bar, particularly preferably between 15 bar and 50 bar and particularly preferably between 20 bar and 30 bar and / or at a temperature between 120°C and 250°C, preferably between 150°C and 220°C, particularly preferably between 160°C and 200°C and particularly preferably between 170°C and 190°C.
  • Pressing is particularly preferred at i80°C and at a pressure of 25 bar, if necessary with a maximum deviation of 10%, since here, on the one hand, the condensation resin penetrates sufficiently deeply into the veneer layer and, on the other hand, a complete penetration of the condensation resin through the veneer layer can be prevented, which would result in an undesirable surface look and/or feel of the stabilized veneer.
  • the stabilizing layer can be made of any material and can have any thickness, it is preferred that a parchment, paper, fleece, vulca or other fiber layer is used as the stabilizing layer and/or the grammage of the stabilizing layer is between 15 g /m 2 and 500 g/m 2 , preferably between 25 g/m 2 and 300 g/m 2 , more preferably between 50 g/m 2 and 250 g/m 2 and most preferably between 50 g/m 2 and 150 g/m 2 , especially when parchment paper is used as the stabilizing layer.
  • a condensation resin with a defined viscosity can be used.
  • a defined water content is very advantageous, the use of a condensation resin with a water mass content of between 4% and 7% being preferred and between 5% and 6% being particularly preferred.
  • the residual moisture content is particularly preferably at least 5%. Unless otherwise stated, all percentages relate to the mass.
  • a further visual and/or haptic configuration of the stabilized veneer obtained can be achieved in an advantageous development of the method according to the invention by using a decorative film, a high-gloss decorative film and/or a structuring agent, in particular for producing different degrees of gloss, and/or a transfer paper during pressing for transferring prints to the veneer on the veneer layer and in particular on the front or surface of the veneer layer.
  • a preferred embodiment of the veneered board provides that the connection of the stabilized veneer and the carrier board by means of an adhesive or resin other than the condensation resin used to produce the stabilized veneer, in particular a PU adhesive or a PU hot-melt adhesive, and/or in a separate gluing and / or pressing process takes place.
  • the connection of the stabilized veneer and the carrier plate is particularly preferably carried out by laminating the veneer on.
  • a parchment with a grammage of 50 g/m 2 is first coated on one side with a melamine resin in an impregnation channel.
  • the application quantity is 100 g resin/m 2 fl.
  • the melamine resin has a solids content of 55% by weight. Furthermore, the melamine resin is a so-called postforming resin, i. H. a resin that is made particularly flexible with the help of an elasticizing agent, so that the stabilized veneer can be bent and, in particular, rolled up. Customary auxiliaries such as hardeners, wetting agents, etc. are also added to the resin, but these are not essential for the basic properties for carrying out the process.
  • the resin applied to the parchment is optionally then impregnated in the impregnation channel dried to a residual moisture content of approx. 6% by weight.
  • the parchment is rolled up at the end of the impregnation channel.
  • the roll of parchment is then clamped onto a CPL press or double belt press with the resin side up and unwound.
  • An oak veneer with a material thickness of 0.6 mm is then carefully placed on the parchment from another roll in order to avoid damaging the veneer layer.
  • the unwind speed is 10 m/min.
  • the CPL press is operated at a temperature of 180 °C and a pressure of 25 bar. After the press, the compressed structure of the stabilized veneer is rolled up into a veneer roll that can be easily handled without damaging the veneer. Alternatively, the stabilized veneer can also be cut to any format.
  • the veneer provided with the back coating is then laminated onto an HDF with a thickness of 8 mm on a laminating press.
  • a PU hotmelt with an adhesive quantity of 100 g/m 2 is used as the adhesive.
  • an oak veneer without a coating on the back was also laminated onto an HDF.
  • a drop ball test (DIN EN 13329: 2016-08, large ball) was then carried out on both panels. A fall height of 750 mm was determined for the panel with the veneer without coating on the back.
  • the board with the stabilized veneer with the back coating achieved a significantly higher value of 1600 mm, which impressively documents the mechanical stabilization of the veneer.
  • an overlay with a grammage of 25 g/m 2 is impregnated with a melamine resin in an impregnation channel.
  • the amount applied is 180 g/m 2 fl. and the solids content is 55% by weight.
  • the melamine resin is again a postforming resin, ie a resin that is made particularly flexible with the help of an elastification agent, so that the stabilized veneer can be bent and, in particular, rolled up.
  • Customary auxiliaries such as hardeners, wetting agents, etc. are also added to the resin, but these are not essential for the basic properties for carrying out the process.
  • the overlay is dried in the impregnation channel to a residual moisture content of approx. 6% by weight.
  • the overlay is rolled up.
  • the roll with the overlay is then re-clamped on a CPL press and unwound.
  • An oak veneer with a material thickness of 0.6 mm is then laid on the overlay from another roll. This time, a release paper is run along the underside of the overlay.
  • the unwind speed is 10 m/min.
  • the CPL press is operated at a temperature of 180 °C and a pressure of 25 bar.
  • the rise of the melamine resin could be controlled by means of temperature and pressure in such a way that the best possible impregnation of the veneer is achieved without the resin becoming visible on the upper side of the veneer.
  • the compressed structure of the stabilized veneer is either rolled up or cut to size.
  • a glass fleece with a grammage of 30 g/m 2 is first impregnated with a mixture of urea and melamine resin in an impregnation channel to produce a particularly thin stabilized veneer.
  • the amount applied is 60 g/m 2 fl. with a solids content of 55% by weight.
  • the melamine resin is again a postforming resin that was made particularly flexible with the help of an elastifier.
  • the glass fleece is then dried in the impregnation channel to a residual moisture content of about 6% by weight. At the end of the canal the impregnated fleece is rolled up.
  • the roll of fleece is then clamped and unwound on a CPL press.
  • An oak veneer with a material thickness of 0.3 mm is then laid on the fleece from another roll.
  • a release paper runs along the underside of the fleece.
  • the unwind speed is again at 10 m/min.
  • the CPL press is operated at a temperature of 180 °C and a pressure of 25 bar.
  • the rise of the melamine resin could be controlled in such a way that the best possible thorough impregnation of the veneer was achieved without the resin being visible on the upper side of the veneer.
  • Downstream of the press the compressed structure of the stabilized veneer is either rolled up or cut to size.
  • an improvement in the mechanical properties could be shown by means of a ball drop test.
  • a fourth embodiment of the method according to the invention for producing a particularly thin stabilized veneer differs from the previous embodiment only in that a stabilization layer made of vulcanized fiber called Vulkament is used in order to obtain a biocomposite material with a surface made of real wood veneer, in particular an oak veneer .
  • a ball drop test shows a significant improvement in the mechanical properties.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention se rapporte à un procédé de fabrication d'un placage stabilisé sans panneau de support, à un placage stabilisé et à un panneau plaqué. L'objectif de l'invention est de fournir un procédé de fabrication d'un placage et un placage, le placage étant particulièrement stable et présentant un degré de stabilité mécanique particulièrement élevé par rapport à des charges de pression en particulier, pouvant être traité facilement et de manière fiable en tant que produit intermédiaire, présentant une épaisseur de placage particulièrement petite et étant ainsi particulièrement peu coûteux à produire, et présentant encore un bon aspect et une bonne haptique de bois véritable. À cet effet, le procédé de fabrication d'un placage stabilisé et/ou enroulable sans panneau de support comprend, en premier lieu, l'étape de fourniture d'une couche de stabilisation, suivie de l'étape de revêtement d'une face, en particulier de la face supérieure, de la couche de stabilisation avec une résine de condensation, puis une étape de pressage de la couche de stabilisation et de la couche de placage afin de former une épaisseur de stabilisation au moyen de la résine de condensation, la résine de condensation étant au moins partiellement pressée hors de la couche de stabilisation et dans la couche de placage pendant le processus de pressage, ce qui conduit à une solidification ou à une stabilisation mécanique du placage à l'intérieur.
EP23705956.3A 2022-02-09 2023-01-31 Procédé de fabrication d'un placage stabilisé et placage stabilisé Pending EP4476070A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22155972.7A EP4227092B1 (fr) 2022-02-09 2022-02-09 Procédé de fabrication d'un placage stabilisé
PCT/EP2023/052336 WO2023151988A1 (fr) 2022-02-09 2023-01-31 Procédé de fabrication d'un placage stabilisé et placage stabilisé

Publications (1)

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EP4476070A1 true EP4476070A1 (fr) 2024-12-18

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EP22155972.7A Active EP4227092B1 (fr) 2022-02-09 2022-02-09 Procédé de fabrication d'un placage stabilisé
EP23705956.3A Pending EP4476070A1 (fr) 2022-02-09 2023-01-31 Procédé de fabrication d'un placage stabilisé et placage stabilisé

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US (1) US20250162291A1 (fr)
EP (2) EP4227092B1 (fr)
CN (1) CN118679060A (fr)
CA (1) CA3243364A1 (fr)
ES (1) ES2999662T3 (fr)
PL (1) PL4227092T3 (fr)
WO (1) WO2023151988A1 (fr)

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DE4422449C2 (de) * 1994-06-29 1997-09-25 Ihd Inst Fuer Holztechnologie Verfahren zur Herstellung eines schichtförmigen Verbundwerkstoffes
EP2352773A1 (fr) * 2008-08-13 2011-08-10 Sylvanova, Inc. Composition de résine d'aldéhyde-polyisocyanate à vulcanisation rapide et procédé de production de polymère hybride
DE102013113125A1 (de) * 2013-11-27 2015-05-28 Guido Schulte Fußboden-, Wand- oder Deckenpaneel und Verfahren zu dessen Herstellung
CN111542432B (zh) * 2018-01-11 2023-01-10 瓦林格创新股份有限公司 饰面元件、用于生产饰面元件的方法
ES2874785T3 (es) * 2018-12-19 2021-11-05 Flooring Technologies Ltd Procedimiento para la fabricación de un material derivado de la madera contrachapado y material derivado de la madera formado por una placa de soporte y al menos dos chapas de madera

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PL4227092T3 (pl) 2025-02-24
WO2023151988A1 (fr) 2023-08-17
CA3243364A1 (fr) 2025-01-20
EP4227092A1 (fr) 2023-08-16
CN118679060A (zh) 2024-09-20
EP4227092B1 (fr) 2024-10-09
ES2999662T3 (en) 2025-02-26
EP4227092C0 (fr) 2024-10-09
US20250162291A1 (en) 2025-05-22

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