FI127005B - Plywood with coating on at least one surface sanded with sandpaper - Google Patents

Plywood with coating on at least one surface sanded with sandpaper Download PDF

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Publication number
FI127005B
FI127005B FI20145579A FI20145579A FI127005B FI 127005 B FI127005 B FI 127005B FI 20145579 A FI20145579 A FI 20145579A FI 20145579 A FI20145579 A FI 20145579A FI 127005 B FI127005 B FI 127005B
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FI
Finland
Prior art keywords
plywood
veneers
veneer
coating
present
Prior art date
Application number
FI20145579A
Other languages
Finnish (fi)
Swedish (sv)
Inventor
Anna Koski
Raija Rautiainen
Original Assignee
Upm-Kymmene Wood Oy
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Filing date
Publication date
Application filed by Upm-Kymmene Wood Oy filed Critical Upm-Kymmene Wood Oy
Priority to FI20145579A priority Critical patent/FI127005B/en
Priority to DE202015103202.1U priority patent/DE202015103202U1/en
Application granted granted Critical
Publication of FI127005B publication Critical patent/FI127005B/en

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Classifications

    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0207—Pretreatment of wood before impregnation
    • 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
    • B32B21/042—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 wood
    • 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
    • B32B21/04—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
    • B32B21/08—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 synthetic resin
    • 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
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2200/00—Wooden materials to be treated
    • B27K2200/30—Multilayer articles comprising wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2240/00—Purpose of the treatment
    • B27K2240/70—Hydrophobation treatment
    • 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
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/002—Sandblasting
    • 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
    • B32B2255/08—Coating on the layer surface on wood 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2255/28—Multiple coating on one surface
    • 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
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/026—Wood 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/538—Roughness
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties

Description

PLYWOOD COMPRISING A COATING ON AT LEAST ONE SANDED SURFACE THEREOF
FIELD OF THE INVENTION
The invention relates to a plywood comprising a number of veneers and having a coating on at least one surface of the plywood.
BACKGROUND OF THE INVENTION
Plywood is a wood based product that comprises multiple layers of thin wood assembled with adhesives or binder compositions. These plywood layers or veneers are glued together with adjacent veneers having a grain direction rotated in a specific angle relative to adjacent layers. The inventors have recognized a need for a plywood being protected against the effects from the surrounding atmosphere. WO 2007088245 A1 discloses a method for coating wood board, in which method the surface of the wood board is first treated with a substance containing a polyalkene glycol or modified acrylic resin. The surface of the wood board is then covered in curable resin, and the resin is cured and simultaneously fixed to the wood board using heat and pressure. WO 2009156594 A1 discloses a method for treating a wood board. A composition containing a hydrophobic agent is provided onto the surface of the wood board and coating agent is provided over it to form a coating layer.
PURPOSE OF THE INVENTION
The purpose of the invention is to provide a new type of plywood comprising a number of veneers and having a coating on at least one surface of the plywood .
SUMMARY
The plywood according to the present invention is characterized by what is presented in claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this specification, illustrate embodiments of the invention and together with the description help to explain the principles of the invention. In the drawings:
Fig. 1 is illustrates the rippling effect as a result of water having penetrated the coating situated on the plywood;
Fig. 2 and Fig. 3 indicate the results from rippling measurements; and
Fig. 4 and Fig. 5 indicate the results from rippling measurements.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a plywood comprising a number of veneers and having a coating on at least one surface of the plywood, wherein the veneers are glued together with a binder composition, the surface of at least the other of the outermost veneers of the plywood is sanded and the coating is provided on the sanded surface, and wherein the coating comprises a hydrophobic agent and a film containing coating agent, which coating agent comprises resin.
The plywood can be treated or coated for protecting its veneers from e.g. humidity, water and the adverse effect of the surrounding atmosphere. The service value of such coated plywood is reduced if holes appear in the coating. In such a case, the outermost or top veneer would easily absorb moisture from the air or water. Also, plywood is commonly used as a material for concrete forming or casting. In connection with casting, moisture from wet concrete may penetrate through holes appearing in the coating into the veneer. From the holes in the coating, the moisture easily spreads in the direction of the wood grains and cause local swelling of the grains, i.e. rippling, and thereby blistering of the surface of the wood board. A problem with processed wood products, such as plywood, is that the surfaces thereof, as a result of the processes, e.g. hot-pressing, they have been subjected to, are often poor in e.g. wettability compared to those of freshly cut, polar wood. The surfaces of plywood may have a glazed appearance indicating that they have been inactivated by pressing at high temperatures. Especially during hot-pressing resinous extractives migrate to the surface, adhesives cure, and caul release agents remain on product surfaces and thus inactivate or block the surfaces from being wetted. During hot-pressing plywood will be subjected to heat treatment, whereby the plywood surface becomes more hydrophobic as a result of plasticisation of lignin and/or loss of residual water leading to reorganisation of the lig-nocellulosic components of the wood. As a result of increased hydrophobicity of plywood the wettability thereof decreases. The poor wettability may then adversely affect the following treatments such as the coating process .
The inventors found out that sanding of the surface of the plywood, on which the coating is to be applied, results in roughness of the surface suitable for good coating of the surface. The surface roughness, as a result of the sanding, of the surface of the plywood has the advantage of enabling even and adequate spreading of the hydrophobic agent over the surface by rollers or spraying.
The inventors also surprisingly found out that sanding of the surface of the plywood on which the coating is to be applied, has the beneficial effect of enabling penetration of the hydrophobic agent into the voids of the wood material, and especially into the vessels and the cells with wide cell lumen. When the hydro-phobic agent, such as wax, fills the cell lumens the rate of water absorption into the plywood is decreased.
The coating comprising a hydrophobic agent and a film containing coating agent is situated on at least one surface of the plywood facing the exterior. In one embodiment of the present invention the coating comprising a hydrophobic agent and film containing coating agent is situated on at least one side of the plywood. In one embodiment of the present invention the plywood comprises a coating on both of its outermost veneers. In one embodiment of the present invention the plywood is surrounded by a coating.
In one embodiment of the present invention, the plywood comprises a coating on the surfaces of both of the outermost veneers of the plywood. In one embodiment of the present invention, the plywood comprises a coating comprising a film containing coating agent, which coating agent comprises resin, on the surfaces of both of the outermost veneers of the plywood. In one embodiment of the present invention, the plywood comprises a coating comprising hydrophobic agent and a film containing coating agent, which coating agent comprises resin, on the surfaces of both of the outermost veneers of the plywood.
The coating provided on the at least one surface of the plywood has the advantage of preventing swelling of the outermost veneer when being contacted with e.g. water or moisture. The use of the hydrophobic agent has the added utility that it is able to penetrate into the wood grains of the veneer. As a result of this effect spreading of water through possible holes formed in the coating of the plywood and swelling of the grains of the top veneer may be prevented.
In one embodiment of the present invention the veneers are glued together with a binder composition. In one embodiment of the present invention the veneers are glued together with an aqueous binder composition. The water present in the aqueous binder composition beneficially makes the cell wall to swell, which has the effect of allowing a smoother route for the binder composition to penetrate into the cell wall and thus of allowing the binder composition to impregnate into the surface of the veneer.
In one embodiment of the present invention the veneers are glued together with a binder composition under the influence of pressing. The use of pressing has the added utility of allowing direction of the binder composition into the veneers. In one embodiment of the present invention, pressing comprises cold-pressing followed by hot-pressing. Cold-pressing has the effect of directing the binder composition into the veneers already before the curing process is started. Especially, the cold-pressing assists in allowing smaller molecules to penetrate deeper into the veneer whereby the amount of binder composition can be increased.
In one embodiment of the present invention the coating agent comprising resin and the aqueous binder composition is the one and the same material. In one embodiment of the present invention the moisture content of the aqueous binder composition used for gluing together the veneers is 40 - 60 weight-%, and preferably 45 - 55 weight-%.
The veneers are glued together with a binder composition, and the surface of at least the other of the outermost veneers of the plywood is sanded, and the coating, which comprises hydrophobic agent and coating agent containing resin is provided on the sanded surface. In one embodiment of the present invention the surfaces of both of the outermost veneers of the plywood are sanded.
The inventors of the present invention surprisingly found out that the use of an aqueous binder composition for gluing together the veneers and sanding of the surface of the plywood on which the coating, comprising the hydrophobic agent and the film containing coating agent, is provided, beneficially affects impregnation of the hydrophobic agent. The sanding opens routes for the impregnation of hydrophobic agent. On the other hand, the use of an aqueous binder composition has the added utility of preventing the hydrophobic agent to penetrate too deep into the outermost veneer.
In one embodiment of the present invention the sanded surface is provided by using at the sanding step before providing the coating on the sanded surface, an abrasive paper having a grit size of P40 - P200, preferably a grit size of P50 - P150, and more preferably a grit size of P60 - P120 in accordance with standard ISO 6344. The use of an abrasive paper with this kind of grit size results in a surface into which the hydrophobic agent easily absorbs. If using a finer grit size, the surface could remain so-called closed for the absorption of the hydrophobic agent and the use of a coarser grit size could result in the hydro-phobic agent being non-uniformly distributed with main part of the hydrophobic agent remaining in the valleys of the surface while the so-called tops or peaks would remain uncovered.
In one embodiment of the present invention the surface of at least the other of the outermost veneers of the plywood is sanded in an essentially transverse direction in relation to the grain direction of the veneer. This has the beneficial effect of most grains on the surface of the plywood and many distinct points of one grain being sanded and so-called opened such that hydrophobic agent easily absorbs into the grains. Especially when sanding the surface of birch veneer, the rather long vessel cells thereof will receive several openings through which the hydrophobic agent will penetrate with a good rate.
In one embodiment of the present invention the plywood comprises a number of veneers and has a coating on at least one surface of the plywood, wherein the veneers are glued together with a binder composition, the surface of at least the other of the outermost veneers of the plywood is sanded in an essentially transverse direction in relation to the grain direction of the veneer and the coating is provided on the sanded surface, and wherein the coating comprises a hydrophobic agent and a film containing coating agent, which coating agent comprises resin.
The inventors of the present invention surprisingly found out that sanding increases the surface roughness and wettability of plywood, which beneficially affects the application of hydrophobic agent and the film containing coating agent on the plywood. As a result of the sanding the hydrophobic agent can be evenly applied on the surface of the veneer. The wettability is an indication of how easily and efficiently some liquid spreads over a wood surface. The wetting process of wood by a liquid, such as water, involves the spreading and penetration of the liquid drop. The wettability can be evaluated by measuring the contact angle (CA) of a droplet as well as by evaluating its spreading rate. Sanding of the plywood surface opens routes for the applied hydrophobic agent to penetrate into the cell lumens, and especially into the vessel cells that are specialised water-conducting cells in birch. The above mentioned rippling phenomenon is caused by e.g. water penetrating first to the vessel cell lumens, and then further into the vessel cell walls resulting in swelling of the cell wall. By filling the lumen with hydrophobic agent the rate of liquid absorption into the cell walls is hindered resulting in reduction or prevention of the rippling phenomenon.
In one embodiment of the present invention the veneers are glued together as to form cross-bonded or cross-laminated plywood. In cross-bonded or cross-laminated plywood the veneers have alternating grain orientations throughout the structure.
In one embodiment of the present invention the veneers are glued together such that the outermost veneer having the sanded surface has a crosswise grain direction in relation to the grain direction of its adjacent veneer.
In one embodiment of the present invention the veneers are glued together such that the four first veneers, as calculated from the surface of the plywood on which the coating is situated, form a cross-bonded or cross-laminated structure. In one embodiment of the present invention the veneers are glued together such that the four first veneers, as calculated from both sides of the plywood, form a cross-bonded or cross-laminated structure.
In one embodiment of the present invention the veneers of the plywood are glued together such that all of the veneers form a cross-bonded or cross-laminated structure except two veneers in the middle of the plywood, which have an essentially parallel grain direction in relation to each other.
In one embodiment of the present invention the veneers are glued together such that the outermost veneer having the sanded surface has a crosswise grain direction in relation to the grain direction of its adjacent veneer, and the subsequent two, three, or four veneers following said outermost veneer have an essentially parallel grain direction in relation to each other and are followed by a veneer having a crosswise grain direction in relation to the grain direction of said subsequent two, three, or four veneers. In one embodiment of the present invention, the third veneer, as calculated from the outermost veneer on which the coating is provided, is glued together with its adjacent veneers by providing binder composition on at least one side of said veneer in an amount of 10 - 50 g/m2, and preferably in an amount of 20 -4 0 g/m2. In one embodiment of the present invention the third veneer, as calculated from the outermost veneer on which the coating is provided, is glued together with its adjacent veneers by providing binder composition on both sides of said veneer in an amount of at least 50 g/m2, and preferably in an amount of at least 100 g/m2. The inventors of the present invention surprisingly found out that applying binder composition on the so-called third veneer as calculated from the outermost veneer increases the dimensional stability and strength as a result of increased amount of binder composition in the surface layers of the plywood. As the dimension stability is increased, the ability of the plywood to resist swelling and shrinkage caused by penetrated water or humidity increases. The increased amount of binder composition in the surface veneer layers prevents thus water from penetrating through the structure of the plywood according to the present invention. The binder composition used for gluing together the veneers has the added utility of part of it being able to penetrate into the cell wall of the wood material beneficially affecting the ability of the plywood to resist adverse effects of water.
In one embodiment of the present invention the veneers are glued together such that the outermost veneer having the sanded surface has a crosswise grain direction in relation to the grain direction of its adjacent veneer, and the subsequent two, three, or four veneers following said outermost veneer have an essentially parallel grain direction in relation to each other and are followed by a veneer having a crosswise grain direction in relation to the grain direction of said subsequent two, three, or four veneers, and this structure is repeated as calculated from the outermost veneer on the opposite side of the plywood.
In one embodiment of the present invention, the plywood comprises an even number of veneers, wherein the two veneers in the middle of the plywood have an essentially parallel grain direction.
In one embodiment of the present invention the first outermost veneer of the plywood is a birch veneer and fulfills the quality class III, and preferably the quality class II, according to standard EN-635.
In one embodiment of the present invention the veneers following the first outermost veneer of the plywood are birch veneers and they fulfill the quality class of K2, K3, or K4 according to the below table:
The peeling defect, which may result from the rotary peeling or rotary cutting process, is consid ered to be an elongated scratch having transverse direction in relation to the grain direction. The terms "hard rot" or "sound rot" could be equally well used instead of the term "firm rot".
In one embodiment of the present invention the veneers of the plywood are made of softwood. In one embodiment of the present invention the veneers of the plywood are made of hardwood.
In one embodiment of the present invention, the density of the wood material from which the veneer is formed is 320 - 750 kg/m3, and preferably 390 - 650 kg/m3. In one embodiment of the present invention the density of the wood material from which the veneer is formed is 390 - 550 kg/m3 or 520 - 650 kg/m3. In one embodiment of the present invention the density of the wood material from which the veneer is formed is 450 -570 kg/m3. The above density values are measured in accordance with standards SFS-EN 384 and ISO 3131 (SFS-EN 384 - Structural timber - Determination of characteristic values of mechanical properties and density (2010), and ISO 3131 - Wood - Determination of density for physical and mechanical tests (1975)).
In one embodiment of the present invention the veneers of the plywood are selected from a group consisting of pine veneer, poplar veneer, beech veneer, aspen veneer, spruce veneer, and birch veneer.
In one embodiment of the present invention at least the first outermost veneer is birch veneer, preferably at least the four, five, or six first veneers of the plywood, as calculated from the first outermost veneer, are birch veneers, and more preferably all the veneers of the plywood are birch veneers. In on embodiment of the present invention at least the outermost veneer, as calculated from the surface of the plywood on which the coating is situated, is birch veneer, preferably at least the four, five, or six first veneers of the plywood, as calculated from the surface of the plywood on which the coating is situated, are birch veneers, and more preferably all the veneers of the plywood are birch veneers.
In one embodiment of the present invention at least one veneer is manufactured by one of rotary cutting, flat slicing, quarter slicing, half-round slicing, and rift cutting. These methods are known as such in plywood manufacturing, and different methods result in a slightly different visual appearance of the veneer. Rotary cutting may also be referred to as rotary peeling, turning or rotary turning. In one embodiment of the present invention, the at least one veneer is manufactured by rotary cutting. In one embodiment of the present invention, all the veneers of the plywood, are manufactured by rotary cutting. In one embodiment of the present invention, at least 80 %, and preferably 100 %, of the veneers of the plywood are manufactured by rotary cutting.
In one embodiment of the present invention the thickness of at least one veneer of the plywood is 0.5-4 mm, preferably 1 - 3.6 mm, and more preferably 1.3 - 3.0 mm. In one embodiment of the present invention the thickness of at least one veneer of the plywood is 1.3 - 3.0 mm. The thicknesses of the veneers of the plywood can be the same for each veneer or can vary from one veneer to another. In one embodiment of the present invention, the veneers of plywood have one and the same thickness. In one embodiment of the present invention, the veneers of the plywood have different thicknesses. In one embodiment of the present invention at least 20 % of the veneers of the plywood have a thickness which is at least 0.2 mm, and preferably at least 0.5 mm less or more than the thickness of the rest of the veneers of the plywood. In one embodiment of the present invention at least 20 % of the veneers of the plywood have a thickness of 0.2 - 3.5 mm, and preferably 0.5 - 2 mm, less or more than the thickness of the rest of the veneers in plywood. In one embodiment of the present invention all the veneers of the plywood are equally thick, with the precision of 0.2 mm.
The moisture percentage of the different veneers used for producing the plywood can vary. In one embodiment of the present invention the average moisture percentage of the veneers to be used for producing plywood before being glued together is 1 - 9, and preferably 2-6. The above moisture values are measured in accordance with standard SFS-EN 322 (Wood-based panels. Determination of moisture content (1993)).
In one embodiment of the present invention at least one veneer is modified by heat treatment, chemical treatment, mechanical treatment, or by a combination thereof. In one embodiment of the present invention at least one veneer is modified by chemical treatment. When the veneers are modified or pretreated the dimensional stability thereof can be increased .
In one embodiment of the present invention the hydrophobic agent is selected from a group consisting of waxes, oils, alkyl ketene dimer (AKD), silicone, silicone oil, and their combinations. In one embodiment of the present invention the hydrophobic agent is paraffin wax, microcrystalline wax, natural wax, and/or slack wax. In one embodiment of the present invention the hydrophobic agent is natural oil. In one embodiment of the present invention the hydro-phobic agent is paraffin wax, microcrystalline wax, or alkyl ketene dimer. Alkyl ketene dimer is a waxy solid material dispersed as small particles in a solution. In one embodiment, the hydrophobic agent is tall oil fatty acid. In one embodiment the hydrophobic agent is stearine.
In one embodiment of the present invention the coating comprises 10 - 150 g/m2, preferably 20 - 100 g/m2, and more preferably 30 - 60 g/m2, of hydrophobic agent based on the total dry weight thereof.
In one embodiment of the present invention the hydrophobic agent is provided onto the at least one surface of the plywood as part of a composition containing the hydrophobic agent. In one embodiment of the present invention the composition is an emulsion containing water. In one embodiment of the present invention part of the water contained in the emulsion is dried off after the emulsion is applied on the plywood and before the film containing coating agent is applied. In one embodiment of the present invention the composition contains the hydrophobic agent in an amount of 10 - 90 weight-%, and preferably 20 - 75 weight-%. In one embodiment of the present invention the composition containing hydrophobic agent further contains at least one additive and/or at least one filler.
In one embodiment of the present invention the plywood comprises at least 20 g of hydrophobic agent per square meter thereof. In one embodiment of the present invention the plywood comprises at least 20 g of paraffin wax per square meter thereof.
In one embodiment of the present invention the coating comprises hydrophobic agent as a layer on the at least one surface of the plywood. In one embodiment of the present invention the coating comprises a film containing coating agent on the layer of hydrophobic agent. In such a case, the layer of hydrophobic agent is situated on the at least one surface of the plywood between the plywood and the film containing coating agent. Providing the layer of hydrophobic agent on the at least one surface of the plywood between the plywood and the film containing coating agent has the advantage that the layer of hydrophobic agent slows down the rate of water absorption into the plywood and thus slows down swelling of the cell walls of the wood. This is beneficial in case the film containing coating agent gets broken during e.g. storage or use.
In one embodiment of the present invention the film containing coating agent is coated with the hydrophobic agent before being provided on the at least one surface of the plywood. In one embodiment of the present invention the hydrophobic agent is provided on one or both sides of the film containing coating agent. In one embodiment of the present invention the film containing coating agent coated with the hydro-phobic agent is provided onto the at least one surface of the plywood such that the hydrophobic agent is situated between the plywood and the film containing coating agent.
In one embodiment of the present invention the hydrophobic agent is provided on the at least one surface of the plywood and a film containing coating agent is provided on the hydrophobic agent. In one embodiment of the present invention the film containing coating agent comprises a piece of paper having resin impregnated therein.
In one embodiment of the present invention the film containing coating agent comprises one or more film layers.
In one embodiment of the present invention the thickness of the film containing coating agent is 100 - 500 g/m2, preferably 110 - 300 g/m2, and more preferably 120 - 220 g/m2. In one embodiment of the present invention the thickness of the film containing coating agent is 100 - 150 g/m2 or 200 - 250 g/m2.
The coating agent comprises resin. In one embodiment of the present invention the resin is a phenolic resin, an amino resin or a combination of phenolic resin and amino resin. In one embodiment of the present invention the resin is a phenolic resin. The phenolic resin can be prepared by using at least polymerizable substance and crosslinking agent, wherein at least part of the polymerizable substance is phenol. In one embodiment of the present invention at least 50 weight-% of the polymerizable substance is phenol. In one embodiment of the present invention the polymerizable substance comprises lignin. In one embodiment the crosslinking agent is formaldehyde. In one embodiment of the present invention catalyst and water are used for preparing the phenolic resin.
In one embodiment of the present invention at least 80 weight-% of the resin is based on phenol. In one embodiment of the present invention, the coating agent consists of phenolic resin. In one embodiment of the present invention the phenolic resin is a phenol-formaldehyde resin. In one embodiment of the present invention the phenolic resin is modified by urea, melamine, lignin, resorcinol, modified phenols, cresols, bisphenols or other equivalent compounds.
In one embodiment of the present invention the coating comprises one or more layers.
The embodiments of the invention described hereinbefore may be used in any combination with each other. Several of the embodiments may be combined together to form a further embodiment of the invention. Plywood, to which the invention is related, may comprise at least one of the embodiments of the invention described hereinbefore.
An advantage of the plywood according to the present invention is that the sanded surface of the plywood on which the coating is applied on results in the fact that e.g. the hydrophobic agent is able to absorb or impregnate into the wooden vessels and the cells which have been "opened" as a result of the sanding procedure .
An advantage of the plywood according to the present invention is that as the surface of the plywood is sanded, the surface is less hydrophobic, which has the beneficial effect of allowing uniform application of the hydrophobic agent, which otherwise would form droplets on the surface. An advantage of the plywood according to the present invention is that the sanded surface allows even distribution of the hydrophobic agent into the cells of the wooden material.
EXAMPLES
Reference will now be made in detail to the embodiments of the present invention.
The description below discloses some embodiments of the invention in such a detail that a person skilled in the art is able to utilize the invention based on the disclosure. Not all steps of the embodiments are discussed in detail, as many of the steps will be obvious for the person skilled in the art based on this specification. EXAMPLE 1 - Forming a plywood having a coating on one side thereof
In this example a plywood comprising a number of birch veneers, each having a thickness of about 1.4 mm, was coated with a coating comprising a hydrophobic agent and a film containing coating agent. The panels were arranged such that the outermost veneer of the plywood, on which the coating was formed, had a crosswise grain direction in relation to the grain direction of its adjacent veneer, and the subsequent three veneers following said outermost veneer had an essentially parallel grain direction in relation to each other and were followed by a veneer having a crosswise grain direction in relation to the grain direction of said subsequent three veneers. This structure was repeated also as calculated from the opposite side of the plywood and between these structures the veneers had a cross-bonded structure. The manner the veneers were glued together in view of their grain direction is presented below:
The veneers were glued together with an aqueous phenol-formaldehyde resin.
The surfaces of the plywood were sanded with a double belt sanding machine (sanding belt roughness was P60 for one belt and P80 for the other belt).
The hydrophobic agent used was paraffin wax and it was used in the form of an emulsion. Two different concentrations were prepared, i.e. one of the emulsions had a wax dry content of 45 % (wax emulsion 1 in the Figure) and the other had a wax dry content of 30 % (wax emulsion 2 in the Figure) . The coating agent was a phenolic resin.
Firstly, the formed plywood panels were treated with the emulsion comprising paraffin wax. The paraffin wax was applied on one side of the plywood in an amount of 100 g/m2. After the application of the paraffin wax, the panels were industrially dried at a drying line consisting of three adjustable drying zones of 40°C, 60°C and 60°C, respectively, and the drying time in each was 40 seconds. Thereafter the film containing phenolic resin, i.e. the phenolic film overlay, was applied thereon in an amount of 220 g/m2. The film containing phenolic resin was applied at a temperature of 135°C under a maximum pressure of 1.8 MPa for 6 minutes.
Comparative example 1 (Untreated)
To evaluate the effect of the use of the emulsions comprising paraffin wax on rippling, plywood panels from the same plywood production lot as used in the other examples were coated with the same film con taining phenolic resin but without the application of the emulsion comprising paraffin wax.
Testing - Rippling
Rippling is the effect that can appear when the coating formed on the plywood is impaired such that e.g. water is able to penetrate the coating and spread in the direction of the wood grains causing swelling of the grains and thereby blistering of the coating surface (see Fig. 1).
In the rippling test the swelled portion, i.e. the rippling figure, is measured. Both the length (in grain direction) and the height of the formed figure are measured in millimeters.
In the test a spike of steal having a diameter of 1 mm and a length of 1.5 mm is pressed against the coated surface such that hole of the same dimensions is formed on the coated wood surface. Then a wetted cloth is placed on the hole such that water may contact the surface to be tested and the cloth is kept thereon for a specified time (2h, 4h and 6h). Thereafter the dimensions of the formed rippling figure are measured. Three parallel measurements are carried out.
The results of the rippling test carried out for the plywood panels of Example 1 and the Comparative example 1 are presented in Fig. 2 and Fig. 3. The number of rippling measurement points in these tests was 44-62 per panel.
Example 2 - Forming plywood having a coating on one side thereof
In this example a plywood comprising a number of birch veneers, each having a thickness of 1.4 mm, was coated with a coating comprising hydrophobic agent and a film containing coating agent. The panels were arranged such that the outermost veneer of the plywood, on which the coating was formed, had a crosswise grain direction in relation to the grain direction of its adjacent veneer, and the subsequent three veneers following said outermost veneer had an essentially parallel grain direction in relation to each other and were followed by a veneer having a crosswise grain direction in relation to the grain direction of said subsequent three veneers. This structure was repeated also as calculated from the opposite side of the plywood and between these structures the veneers have a cross-bonded structure. The manner the veneers were glued together in view of their grain direction is presented below:
The veneers were glued together with a thermoplastic resin, i.e. a polypropene resin.
The surfaces of the plywood were sanded with a double belt sanding machine (sanding belt roughness was P60 for one belt and P80 for the other belt).
The hydrophobic agent used was paraffin wax and it was used in the form of an emulsion. Two different concentrations were prepared, i.e. one of the emulsions had a wax dry content of 45 % and the other had a wax dry content of 30 %. The coating agent was a phenolic resin.
Firstly, the formed plywood panels were treated with the emulsion comprising paraffin wax. The paraffin wax was applied on one side of the plywood in an amount of 100 g/m2. After the application of the paraffin wax, the panels were industrially dried at a drying line consisting of three adjustable drying zones of 40°C, 60°C and 60°C, respectively, and the drying time in each was 40 seconds. Thereafter the film containing phenolic resin, i.e. the phenolic film overlay, was applied thereon in an amount of 220 g/m2. The film containing phenolic resin was applied at a temperature of 135°C under a maximum pressure of 1.8 MPa for 6 minutes.
Example 3 - Forming plywood having a coating on one side thereof
In this example a plywood comprising a number of birch veneers, each having a thickness of 1.4 mm, was coated with a coating comprising hydrophobic agent and a film containing coating agent. The panels were arranged to have a cross-laminated structure as below presented:
The veneers were glued together with an aqueous phenol-formaldehyde resin.
The surfaces of the plywood were sanded with a double belt sanding machine (sanding belt roughness was P60 for one belt and P80 for the other belt).
The hydrophobic agent used was paraffin wax and it was used in the form of an emulsion. The emulsion had a wax dry content of 30 %.
Firstly, the formed plywood panels were treated with the emulsion comprising paraffin wax. The paraffin wax was applied on one side of the plywood in an amount of 100 g/m2 or 120 g/m2. After the application of the paraffin wax, the panels were industrially dried at a drying line consisting of three adjustable drying zones of 40°C, 60°C and 60°C, respectively, and the total drying time was 1.5 - 2 minutes. Thereafter the film containing phenolic resin, i.e. the phenolic film overlay, was applied thereon in an amount of 220 g/m2. The film containing phenolic resin was applied at a temperature of 135°C under a maximum pressure of 1.8 MPa for 6 minutes.
Testing - Rippling
The rippling test described above was carried out for the plywood produced in accordance with Example 3. The reference or comparative plywood panels were treated in a similar manner as the ones produced in Example 3 with the exception that no paraffin wax application was used. The results from the rippling test are presented in Fig. 4 and Fig. 5. Number of rippling measurement points was 44 per plywood panel type (i.e. comparative panel, 100 g/m2, and 120 g/m2) .
Example 4 - Use of different hydrophobic agents and different forms thereof for coating plywood
The procedure described above for Example 3 was repeated with varying the hydrophobic agent, the form thereof and the amount of the applied hydrophobic agent (g/m2) . Also the drying procedure of Example 3 was replaced by allowing the plywoods, with the hydro-phobic agent applied on the surface thereof, to dry at room temperature over a night. Results from the rippling test carried out as above described after 4 hours are indicated in Table 1.
The dry wax content of wax emulsion 1 was 30 % and the dry wax content of wax emulsion 2 was 45 %. The dry content of AKD was 15 %. Number of rippling measurement points was six per plywood panel type.
Table 1
Example 5 - Forming plywood having a coating on both sides thereof
The procedure of Example 3 was repeated in this example with the exception that both sides of the plywood were coated. Some of the plywood panels were coated with a coating as described in Example 3 on both sides of the plywood panels. Some of the plywood panels were coated with a coating as described in Example 3 on one side of the plywood and with a coating of paraffin wax on the other. Part of the plywood panels were coated with a coating as described in Example 1 on one side of the plywood and with a coating of a film containing phenolic resin on the other.
It is obvious to a person skilled in the art that with the advancement of technology, the basic idea of the invention may be implemented in various ways. The invention and its embodiments are thus not limited to the examples described above; instead they may vary within the scope of the claims.

Claims (16)

1. Vaneri, joka käsittää joukon viiluja ja jossa vanerin vähintään yhdellä pinnalla on pinnoite, tunnettu siitä, että viilut on liimattu yhteen sideainekoostumuksella, vanerin uloimmista viiluista vähintään toisen pinta on hiottu ja pinnoite on järjestetty hiotulle pinnalle, ja siitä, että pinnoite käsittää hydrofobisen aineen ja pinnoitusainetta sisältävän kalvon, joka pinnoitusaine käsittää hartsia, ja siitä, että hiottu pinta on saatu aikaan käyttämällä hiontavaiheessa ennen pinnoitteen järjestämistä hiotulle pinnalle standardin ISO 6344 mukaista hiomapaperia, jonka raekoko on P40 - P200.A plywood comprising a plurality of veneers, wherein at least one surface of the plywood has a coating, characterized in that the veneers are glued together by a binder composition, and a coating film comprising a resin, and wherein the sanded surface is obtained by using a sandpaper according to ISO 6344 having a grain size of P40 to P200 prior to applying the coating to the sanded surface. 2. Patenttivaatimuksen 1 mukainen vaneri, jossa viilut on liimattu yhteen vesipitoisella sideainekoostumuksella ja edullisesti vesipitoisella fenolihartsilla.Plywood according to claim 1, wherein the veneers are glued together with an aqueous binder composition and preferably with an aqueous phenolic resin. 3. Jonkin patenttivaatimuksista 1-2 mukainen vaneri, jossa hiottu pinta on saatu aikaan käyttämällä hiontavaiheessa ennen pinnoitteen järjestämistä hiotulle pinnalle standardin ISO 6344 mukaista hiomapaperia, jonka raekoko on edullisesti P50 - P150 ja jonka raekoko on edullisemmin P60 - P120.Plywood according to any one of claims 1 to 2, wherein the sanded surface is obtained by using abrasive paper according to ISO 6344, preferably having a grain size of P50 to P150 and more preferably having a grain size of P60 to P120, prior to applying the coating to the sanded surface. 4. Jonkin patenttivaatimuksista 1-3 mukainen vaneri, jossa vanerin uloimmista viiluista vähintään toisen pinta on hiottu olennaisesti poikittaisessa suunnassa suhteessa viilun syysuuntaan.Plywood according to any one of claims 1 to 3, wherein the surface of at least one of the outermost veneers of the plywood is sanded in a substantially transverse direction relative to the veneer direction of the veneer. 5. Jonkin patenttivaatimuksista 1-4 mukainen vaneri, jossa viilut on liimattu yhteen siten, että uloimman viilun, jossa on hiottu pinta, syysuunta on ristikkäinen suhteessa sen vieressä olevan viilun syysuuntaan.Plywood according to any one of claims 1 to 4, wherein the veneers are glued together such that the outer direction of the veneer having the ground surface is transverse to the autumn direction of the adjacent veneer. 6. Jonkin patenttivaatimuksista 1-5 mukainen vaneri, jossa viilut on liimattu yhteen siten, että uloimman viilun, jossa on hiottu pinta, syysuunta on ristikkäinen suhteessa sen vieressä olevan viilun syysuuntaan ja mainitun uloimman viilun jälkeen seu- raavien kahden, kolmen tai neljän viilun syysuunta on olennaisesti yhdensuuntainen suhteessa toisiinsa ja niiden jälkeisen viilun syysuunta on ristikkäinen suhteessa mainittujen seuraavien kahden, kolmen tai neljän viilun syysuuntaan.Plywood according to any one of claims 1 to 5, wherein the veneers are glued together such that the outer direction of the outer veneer having the sanded surface is transverse to the autumn direction of the adjacent veneer and the second, three or four veneers following the outer veneer. is substantially parallel with respect to one another and the subsequent direction of the veneer is transverse to that of the following two, three or four veneers. 7. Jonkin patenttivaatimuksista 1-6 mukainen vaneri, jossa vähintään vanerin uloin viilu laskettuna vanerin pinnasta, jolla pinnoite sijaitsee, on koivuviilu, edullisesti vähintään vanerin neljä, viisi tai kuusi ensimmäistä viilua laskettuna vanerin pinnasta, jolla pinnoite sijaitsee, ovat koivuviiluja ja edullisemmin vanerin kaikki viilut ovat koivuviiluja.Plywood according to any one of claims 1 to 6, wherein at least the outermost veneer of the plywood on which the coating is located is birch veneer, preferably at least four, five or six first plywoods of the plywood on which the coating is located are birch veneer and more preferably all plywood. veneers are birch veneers. 8. Jonkin patenttivaatimuksista 1-7 mukainen vaneri, jossa vanerin vähintään yhden viilun paksuus on 0,5 - 4 mm, edullisesti 1-3,5 mm ja edullisemmin 1,3 - 3,0 mm.Plywood according to any one of claims 1 to 7, wherein at least one veneer has a thickness of 0.5 to 4 mm, preferably 1 to 3.5 mm, and more preferably 1.3 to 3.0 mm. 9. Jonkin patenttivaatimuksista 1-8 mukainen vaneri, jossa hydrofobinen aine on valittu ryhmästä, joka koostuu vahoista, öljyistä, alkyyliketeenidi-meeristä, silikonista, silikoniöljystä ja niiden yhdistelmistä .Plywood according to any one of claims 1 to 8, wherein the hydrophobic agent is selected from the group consisting of waxes, oils, alkyl ketene dimer, silicone, silicone oil and combinations thereof. 10. Jonkin patenttivaatimuksista 1-9 mukainen vaneri, jossa hydrofobinen aine on parafiinivaha, mikrokiteinen vaha, luonnosta saatava vaha ja/tai slack-vaha (slack wax).Plywood according to any one of claims 1 to 9, wherein the hydrophobic agent is paraffin wax, microcrystalline wax, naturally occurring wax and / or slack wax. 11. Jonkin patenttivaatimuksista 1-10 mukainen vaneri, jossa hydrofobinen aine on parafiiniva-ha, mikrokiteinen vaha tai alkyyliketeenidimeeri.Plywood according to any one of claims 1 to 10, wherein the hydrophobic agent is paraffin wax, microcrystalline wax or alkyl ketene dimer. 12. Jonkin patenttivaatimuksista 1-11 mukainen vaneri, jossa pinnoite käsittää hydrofobista ainetta, joka on järjestetty vanerin hiotulle pinnalle, ja pinnoitusainetta sisältävä kalvo on järjestetty hydrofobisen aineen päälle.Plywood according to any one of claims 1 to 11, wherein the coating comprises a hydrophobic material arranged on the sanded surface of the plywood, and a film containing the coating material is provided on the hydrophobic material. 13. Jonkin patenttivaatimuksista 1-12 mukainen vaneri, jossa pinnoite käsittää 10 - 150 g/m2, edullisesti 20 - 100 g/m2 ja edullisemmin 30 - 60 g/m2 hydrofobista ainetta sen kokonaiskuivapainon perusteella .Plywood according to any one of claims 1 to 12, wherein the coating comprises 10 to 150 g / m 2, preferably 20 to 100 g / m 2, and more preferably 30 to 60 g / m 2, based on its total dry weight. 14. Jonkin patenttivaatimuksista 1-13 mu kainen vaneri, jossa hartsi on fenolihartsi, amino-hartsi tai fenolihartsin ja aminohartsin yhdistelmä.Plywood according to any one of claims 1 to 13, wherein the resin is a phenolic resin, an amino resin or a combination of a phenolic resin and an amino resin. 15. Jonkin patenttivaatimuksista 1-14 mu kainen vaneri, jossa hartsi on fenolihartsi.Plywood according to any one of claims 1 to 14, wherein the resin is a phenolic resin. 16. Jonkin patenttivaatimuksista 1-15 mu kainen vaneri, jossa pinnoitusainetta sisältävän kalvon paksuus on 100 - 500 g/m2, edullisesti 110 - 300 g/m2 ja edullisemmin 120 - 220 g/m2.Plywood according to any one of claims 1 to 15, wherein the film containing the coating agent has a thickness of 100 to 500 g / m 2, preferably 110 to 300 g / m 2, and more preferably 120 to 220 g / m 2.
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