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
  • 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
  • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
• • 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
  • B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
• • 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
  • B32B21/14—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
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin 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
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
  • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
• • 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
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • 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
  • B32B37/1284—Application of adhesive
  • B32B37/1292—Application of adhesive selectively, e.g. in stripes, in patterns
• • 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
  • B32B37/18—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 discrete sheets or panels 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
  • 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
  • B32B7/10—Interconnection of layers at least one layer having inter-reactive 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
  • 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
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • 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
  • B32B2307/542—Shear strength
• • 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
  • B32B2307/554—Wear resistance
• • 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
  • 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
  • B32B2605/00—Vehicles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
  • C08J2351/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2848—Three or more layers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2852—Adhesive compositions
  • Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
  • Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood

Definitions

• the invention relates to a self-adhesive material for a wood board as defined in the preamble of claim 1 and to a wood board as defined in the preamble of claim 16.
• Wood boards meant here are, for example, plywood, particle boards and hard and medium hard fiber boards. These products need often a coating over them to protect the base product or to give some specific surface property to them.
• Coatings used for wood products are normally some organic polymers, very often resins like phenolic resins and melamine resins. Thermoplastic coatings are also used, but the problem with them is how to adhere them to wood panels or products. Polymer priming is one method with the use of hot-melt glues.
• MAPP maleated polypropylene
• the film comprises in one embodiment maleic anhydride grafted ethyl-vinyl acetate co-polymer (MA-g-EVA) . No treatment, e.g. no activation, of the film during film manufacture is employed.
• MA-g-EVA maleic anhydride grafted ethyl-vinyl acetate co-polymer
• the objective of the invention is to disclose a new type of self-adhesive material and the attachment of the material to a wood board.
• the invention aims to solve coating and gluing the veneers of the wood board with a complete new and very simple way.
• a self-adhesive material for a wood board and a wood board according to the invention are characterized by what is presented in the claims.
• the invention is based on a self-adhesive material for a wood board, e.g. for gluing and/or coating.
• the self- adhesive material is formed of polyolefin film having a melt index is ⁇ 4 g/10 min (measured 190 °C/2.16 kg)
• the polyolefin film contains reactive groups with -OH groups of the wood for forming self-adhesive properties.
• Polyolefin film is a self-adhesive by means of the reactive groups.
• the invention is based on a wood board, which wood board is formed so that the veneers of the wood board are joined together.
• the wood board is manufactured by said self-adhesive material so that the self-adhesive material is used as a coating onto board and/or as a glue-line material between veneers.
• the invention is specifically based on the self adhesive film.
• the self-adhesive film is grafted by reactive groups, e.g. maleic anhydride groups, which react and form covalent bonds with -OH groups in other material e.g. natural products like wood or wood derivative products.
• the melt index being ⁇ 4 g/10 min
• a wood board refers to any wood panel product, plywood product, particle board, fiberboard, composite product, beam, pressed panel product or the like, formed of a number of veneers and principally of wood-based materials, in which the veneers are laid one upon the other and glued together.
• a wood board refers to any wood product or fiber product.
• a veneer refers to any layer of material, typically a thin layer of material. In a preferable embodiment the wood board is plywood.
• a wood board according to the invention can comprise veneer layers of different thickness.
• the thicknesses of the veneer layers can vary.
• the veneer layers can be arranged in the desired position, i.e. crosswise or lengthwise in the desired order.
• the polyolefin film is at least partially cross-linked.
• the polyolefin film comprises at least two layers which are the first and second layer, and at least the first layer is a self-adhesive layer so that it contains reactive groups with -OH groups of the wood.
• the second layer is at least partially cross-linked.
• the first layer is at least partially cross-linked.
• the second layer contains also reactive groups with -OH groups of the wood.
• at least one additive layer is arranged between the first and second layers.
• the film can comprises more than one additive layers e.g. 2 - 10 additive layers.
• the additive layer can contain functional additive.
• the additive layer can contain, for example, fire retardants, UV- stabilisers and fillers.
• polyolefin is selected from group: polyethylene, polypropylene and their combinations.
• the polyolefin film or each layer can include additives and fillers.
• the polyolefin film and/or the film layers can be made from petrochemical and renewable feedstock materials.
• bio-based polymers can be used.
• the bio-based polymers have processing temperature over 180 0 C or over 190 0 C.
• all film layers are substantially formed of the same material.
• at least one film layer is formed of a different material than the other films layers.
• Compatibilisers can be added to the film in order to adhere the dissimilar polymers to each other.
• the reactive groups of the polyolefin film is activated at temperatures of more than 180 0 C, in one embodiment at temperatures of more than 190 °C, during the manufacturing of the self-adhesive material.
• the sufficient time for activation is about 0.5 - 3 minutes, in one embodiment about 2 - 3 minutes. Then the film formed contains activated functional groups capable of forming the maximum number of covalent bonds with wood.
• the polyolefin film contains maleated polyolefin which contains maleic anhydride reactive groups.
• the film layer contains polyethylene (PE) , polypropylene (PP) , maleic anhydride polyethylene (MAPE) , maleic anhydride polypropylene (MAPP) or derivates thereof or their combinations.
• PE polyethylene
• PP polypropylene
• MAE maleic anhydride polyethylene
• MAPP maleic anhydride polypropylene
• at least one film layer contains maleic anhydride polyolefin.
• the outer film layers contain maleic anhydride polyolefin.
• a laminated layer can be added onto the self-adhesive material.
• the laminating improves mechanical properties and scratch resistant of the self-adhesive material.
• the polyolefin films can be adhered directly to the wood when the film is maleated at least on one side and especially when the maleated layer is treated so that its temperature during manufacturing has been over 180 0 C or 190 0 C, so that maleic acid is converted to maleic anhydride.
• Maleic anhydride is very reactive with wood, forming a covalent bond with celluloses -OH groups. Without this activation, normal maleated film forms predominantly hydrogen bonds, which are much weaker than covalent chemical bonds. So we also can bond polyolefin film directly to wood without any priming and joining layers.
• the self-adhesive material and the wood board are joined together by means of the maleic anhydride polyolefin.
• the maleic anhydride polyolefin forms chemical and mechanical bonds between the polyolefin film and the veneer of the wood board.
• the film or the film layer which includes maleated polyolefin also contains polymer e.g. polyethylene or polypropylene.
• the film layer including maleated polyolefin essentially consists of MAPE+PE or MAPP+PP.
• maleated polyolefin contains maleic acid 0.3 - 15 % by weight of the maleated polyolefin, in one embodiment 1 - 5 % by weight of the maleated polyolefin.
• the film layer is maleated to the desired degree in order to improve friction and wetting properties of the self-adhesive material.
• the polyolefin film contains iso-cyanate grafted polyolefin which contains reactive groups.
• the polyolefin film or layer of the film is grafted with alkoxysilane containing reactive functional groups with the polyolefin.
• the polyolefin film is grafted with hydrolysable vinyl-mono-, -di- or - tri-alkoxysilane .
• vinyl group can be replaced with isosyanate- or epoxy groups.
• Alkoxysilanes alcohol groups can be methyl-, ethyl-, propyl- or isopropyl-groups and silane can contain 1, 2 or 3 alkoxy-groups .
• the reaction with polyolefin with the vinyl or other reactive groups happens already during the polyolefin film extrusion and reaction with wood by silane-groups during or after the manufacturing of the wood board .
• the polyolefin film is cross-linked by a method selected from group: silane moisture method, electron beam (EB) radiation, vinyl-silane hydrolysis and their combinations.
• the cross-linking can be made before the film is pressed to wooden surface or on veneer of the wood board. Alternatively the cross-linking can be made after the manufacturing the wood board into final product.
• the thickness of the polyolefin film may vary depending on the properties of the film materials and the application of the wood board.
• the wood board can be made using apparatuses and methods known per se. Laying the veneers one upon the other, joining them together and other typical steps in making the wood board can be performed in any manner known per se in the art.
• the self-adhesive material can be prepared using apparatuses and methods known per se, e.g. by extrusion or by co-extrusion.
• Arranging the self- adhesive material of the invention on the surface or between the veneers of the wood board can be performed e.g. using the hot-pressing technique, extruder technique, film technique, roll application technique, cylinder application technique, coat and multi-layer coat application technique, all known per se, their combinations or a corresponding technique.
• the veneers can be joined together e.g. using the hot-pressing technique.
• a catalyst is used in self -adhesive material manufacturing.
• the catalyst increases the frequency of the covalent bonds formed between coupling agent, e.g. maleic anhydride, and wood.
• coupling agent e.g. maleic anhydride
• wood e.g. maleic anhydride
• Catalyst known to create such bonds and preferred is zinc anhydride.
• the catalyst is hydrated zinc acetate.
• the catalyst cannot be extruded in the same layer as the coupling agent, e.g. maleic anhydride because it will open the maleic anhydride cyclic ring. Therefore, the catalyst can be applied to the films after extrusion and activated by heat during hot-pressing or applied directly to the wood.
• polyolefin film can be prepared by using catalysts known per se.
• the self- adhesive material is attached onto the veneers of the wood board by hot-pressing at temperatures of 120 - 170 0 C.
• the self-adhesive material is attached to the veneer by reactive groups.
• a benefit of one embodiment of this invention is that temperatures of only 120 - 140 0 C are needed to fix the film onto the veneer surface.
• the hot-pressing conditions like temperature, pressure and time, depend on the wood type, e.g. spruce or birch, and polyolefin melting temperature. It is important in order to induce plastic melt flow that the hot-pressing temperature is set to a temperature 20 - 50 0 C above the melting temperature of the polymer.
• the surface properties can be modified using fillers in the surface layer and using different degrees of maleation.
• High density maleation on the surface modifies its properties in the direction of polar material wetting, which also means a higher friction coefficient. This is a positive improvement especially in transport industry.
• This maleated surface is also excellent surface for painting especially with water based paints.
• Polar groups will also wet the surface at sterilization with H 2 O 2 or HClO or other desinfective materials, used in slaughterings, meat and fish transport vehicles etc.
• the invention makes it possible to prepare self-adhesive films. Adhesion of the self-adhesive material on wood is excellent.
• the self-adhesive material and the wood board in accordance with the invention are suitable for various applications.
• the wood board can be used for applications where high wear resistance is needed, e.g. side walls of vans, trailers, horse boxes, kitchens and furniture, play ground equipment, sports equipment, flight cases and sign boards.
• Fig. 1 shows a schematic diagram of the chemical reactions
• Fig. 2 shows a self-adhesive material structure according to the invention.
• Figure 1 discloses a schematic diagram of the chemical reactions in the manufacturing the self- adhesive material and the wood board, e.g. plywood.
• the wood board e.g. plywood.
• Figure 2 discloses a self-adhesive material structure of the invention.
• the self-adhesive material is formed of a film which comprises three layers: first (1), second
• the first layer is a bottom layer (1)
• second layer is a top layer (2)
• additive layer (3) is arranged between the first and second layers.
• the top film layer (2) is formed of polyolefin, e.g. polyethylene or polypropylene, and maleated polyolefin, e.g. maleic anhydride polyethylene (MAPE) or maleic anhydride polypropylene
• the top film layer can be cross-linked.
• the bottom layer (1) is formed of MAPE or MAPP.
• the additive layer (3) is sandwiched between the top layer (2) and the bottom layer (1) .
• the additive layer is formed of polyethylene or polypropylene including additives, like fire retardants and UV-stabilisers, and fillers.
• the self-adhesive material and the wood board used in the tests can be prepared following.
• the three-layer self-adhesive film is prepared of polyolefin, maleated polyolefin and additives and fillers by co-extruding.
• Maleated polyolefin contains maleic acid which is converted maleic anhydride at temperatures of more than 190 0 C during the manufacturing of the film.
• the top film layer can be cross-linked by electron beam radiation at this stage. The layers of the film are joined together for forming the film.
• the formed film is cut to size and is arranged between the veneers of the wood board and/or onto the wood board as a coating.
• the veneers of the wood board are bound together and/or the coating is attached on the surface by hot pressing, cold pressing and/or high frequency pressing.
• the hot pressing is made at temperatures of about 120 - 140 0 C, at pressure of about 1.2 - 1.9 N/mm 2 and by time of 2 - 8 minutes.
• the cold pressing can follow the hot pressing.
• the cold pressing is made until the temperature falls below 80 - 100 0 C, at pressure of about 1.2 - 1.7 N/mm 2 and by time of 0.5 - 5 minutes.
• the high frequency pressing is made by frequency of 13.10 MHz and time of about 2 - 5 minutes.
• the self- adhesive material can be cross-linked by radiation or silane-moisture method at this stage.
• a wood board can be plywood, particle board, high or middle density fiberboard, or some other pressed and glued board containing wood or other plant fibers .
• the maleated polyolefin contains normally 2 - 15 % maleic acid of the amount of polyolefin. At extrusion at temperatures of more 180 0 C the maleic acid is converted to maleic anhydride, partially or totally.
• the polymer film can also be cross-linkable if it in any case improves the use of the products.
• the self-adhesive material of Figure 2 used in the tests was prepared.
• the tests are carried out as following.
• Adhesion of the coating to the plywood was measured by three different methods peel test (ISO4578, SFS-EN204), the result was the separation force as a function of coating length (25 mm) .
• the second test was the dolly test (EN311) and the third test was the shearing test. In the case of the shearing test and peeling test the measurements could be made after soaking and boiling in addition to the dry samples. However, the dolly test could only be performed on dry samples.
• Table 2 discloses birch plywood coating adhesive properties peeling (ISO 4578, SFS-EN204) and pull strength (dolly test, EN311) .
• the melt index of the polyethylene is MI- 0.3 g/10 min (190 °C/2.16 kg) .
• the coupling agents are Fusabond MD-353D (MAPP) and Fusabond MB-226DE (MAPE) . Pressing conditions are: Temp. 130 - 150 0 C, Pressure 1.8 N/mm 2 and Time 8 minutes .
• Table 3 discloses birch plywood coating adhesive properties peel strength measured for dry samples and after soaking and boiling.
• the melt index (MI) of the polyethylene is 0.3 (190 °C/2.16 kg) except where specified as HDPE or MDPE and then MI- 0.2 g/10 min (190 °C/2.16 kg) or MI- 0.7 g/10 mm ( 1 90 3 C/2 . 1 6 kg) respectively i s used .
• Hot pressing conditions are: Temp. 135 - 160 0 C, Pressure 1.7 N/mm 2 and Time 3.5 - 8 minutes.
• the coupling agent used was Fusabond MB-226DE unless otherwise specified.
• Table 4 discloses birch plywood coating adhesion properties peeling (ISO 4578, SFS-EN204) and shear strength perpendicular to the surface (EN319) after different pretreatments (dry, soaking, boiling, EN204) for uncross-linked and cross-linked coated (0.27 mm) plywood. Hot-pressing: 7 minutes, 135 0 C and 1.7 N/mm 2 .
• the coupling agent used was Fusabond MB- 226DE unless otherwise stated.
• the mono film contained no MAPE it was just LDPE (MI-0.3 g/10 min, 190 °C/2.16 kg) .
• the aim of using just polyethylene to coat the surface was to show the effect of having no coupling agent. The results were acceptable for dry conditions but after boiling the wood failure was 9 %. Therefore failure was in the coating. This shows the importance of forming a chemical bond.
• Table 5 discloses birch plywood coating adhesive properties peel (ISO 4578 and SFS-EN204) and shear strength perpendicular to the surface (EN319) after different pretreatments (soaking, boiling, EN204) for low viscosity films (MI-4 g/10min (190 °C/2.16 kg) in all layers) .
• the films could not be extruded above 170 0 C.
• Table 6 discloses birch plywood coated with multi-layered dissimilar self-adhesive coating properties (scratch, boiling resistance and delamination of polypropylene or polyamide) .
• Hot- pressing conditions are: Temp. 140, Pressure 1.7 N/mm 2 and Time 8 min.
• the scratch test is performed using an Erichsen test pen (Model 318) .
• the test was developed by Robert Boch GmBH. Samples 100 x 100 mm are prepared and then the pen is applied which has forces (2 - 20 N) . The surface is simply scratched using the pen the scratch force is increased from 2-20 N in steps of 2N. The first scratch that can be seen by the naked eye is the force that the coating can take and therefore the scratch resistance level.
• Table 7 discloses birch plywood coating hardness (DIN 53505) and scratch resistance properties for different coatings compared with other coating materials for plywood.
• the different maleated polymers used are Fusabond MD-353D (MAPP) , and Fusabond MB- 226DE (MAPE) .
• a self-adhesive material and a wood board according to the invention are suitable in its different embodiments for different types of applications.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Forests & Forestry (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• Organic Chemistry (AREA)
• Polymers & Plastics (AREA)
• Medicinal Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Laminated Bodies (AREA)
• Adhesive Tapes (AREA)
• Veneer Processing And Manufacture Of Plywood (AREA)

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• 2009
  • 2009-02-18 BR BRPI0907816-9A patent/BRPI0907816A2/pt not_active IP Right Cessation
  • 2009-02-18 KR KR1020107020759A patent/KR20100121517A/ko not_active Withdrawn
  • 2009-02-18 EP EP09713411A patent/EP2250017A4/en not_active Withdrawn
  • 2009-02-18 CN CN2009801055437A patent/CN101945759A/zh active Pending
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• 2015
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