WO1989011240A1 - Panneau sandwich et procede pour sa fabrication - Google Patents

Panneau sandwich et procede pour sa fabrication Download PDF

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Publication number
WO1989011240A1
WO1989011240A1 PCT/EP1989/000538 EP8900538W WO8911240A1 WO 1989011240 A1 WO1989011240 A1 WO 1989011240A1 EP 8900538 W EP8900538 W EP 8900538W WO 8911240 A1 WO8911240 A1 WO 8911240A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
core
plastic
sandwich
sandwich panel
Prior art date
Application number
PCT/EP1989/000538
Other languages
German (de)
English (en)
Inventor
Friedrich Schock
Original Assignee
Schock & Co. Gmbh
E.I. Du Pont De Nemours And Company
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
Priority claimed from DE19883817224 external-priority patent/DE3817224A1/de
Priority claimed from DE19883817182 external-priority patent/DE3817182A1/de
Application filed by Schock & Co. Gmbh, E.I. Du Pont De Nemours And Company filed Critical Schock & Co. Gmbh
Publication of WO1989011240A1 publication Critical patent/WO1989011240A1/fr

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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
    • B32B21/04—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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B13/00—Details of tables or desks
    • A47B13/08—Table tops; Rims therefor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • A47B96/18—Tops specially designed for working on
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/24—Feeding the material into the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/70—Completely encapsulating inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • B29C70/745—Filling cavities in the preformed part
    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2200/00—General construction of tables or desks
    • A47B2200/0001—Tops
    • A47B2200/001—Manufacture of table tops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/14—Wood, e.g. woodboard or fibreboard
    • 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
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured

Definitions

  • the invention relates to a sandwich panel with a core made of wood material, which is arranged between two plastic layers, at least one of the plastic layers being formed from a polymer casting compound containing an inorganic filler.
  • Such sandwich panels in the form of melamine-resin or polyester resin-coated wooden panels are known from the prior art, the plastic layer either being applied to the wooden panel as a pigmented cover layer or serving as a protective layer for the underlying surface of the wooden panel.
  • moldings which can be used particularly in the construction industry are known, which are essentially formed from polymers of methyl methacrylate and a content of aluminum hydroxide or aluminum oxide trihydrate or quartz powder.
  • moldings are fire-resistant and impact-resistant and represent high-quality products that are particularly characterized by their flame resistance and their high resistance to acid etching.
  • Such moldings are known for example from DE-PS 20 06 197 or from DE-PS 24 49 656.
  • the sandwich panels described at the outset have a wooden core and a polyester layer applied thereon, which is filled with aluminum oxide trihydrate.
  • the object of the invention is to provide a sandwich panel of the type described at the outset with a color effect such that the panel is given an improved appearance, the essential properties of the plastic body being retained.
  • This object is achieved according to the invention in that a coloring layer is rarely arranged on the filled plastic layer, adjacent to the core, and in that the layer thickness of the filled plastic layer is at least about 3 mm.
  • the sandwich panels according to the invention cannot be compared with the customary film-coated or lacquered wood-based panels. Due to the large layer thickness of the filled plastic layer, the sandwich panel according to the invention can be processed like the known plastic moldings. For example, the plates can be glued together on the end face and the seams can be ground so that the seams or joints are completely unobtrusive. In addition, the surface properties remain unchanged even on the ground joints, as the plastic Only a small part of the material layer is removed at the given layer thickness.
  • both plastic layers are formed from a polymer filled with an inorganic filler.
  • the " sandwich panels " according to the invention do not detach the plastic layers from the wooden core without a mediating elastic glue layer having to be used between the plastic layer and the wooden core.
  • the sandwich panels according to the invention are no longer inferior in their appearance to the filled plastic molded panels, this surprising result now offers a multitude of possibilities for producing sandwich panels with the advantageous properties of the previously known filled plastic molded panels.
  • the flame resistance of these materials is the same as that known from the known filled plastic moldings.
  • the impact strength on the other hand, surprisingly increases compared to the known moldings in the sandwich panel, so that the excellent impact strength values known from the previously known filled plastic moldings are still exceeded by the sandwich panel according to the invention.
  • the coloring layer can either be applied to the core as a separate layer or it can be an integral part of the filled plastic slide. In the latter case, a layer of casting compound with pigments can first be applied to the core during the manufacture of the plates and then unpigmented casting compound can be overlaid.
  • a hard organic filler namely titanium dioxide as carrier material for the dyes, is almost automatically introduced into the casting compound, as a result of which the surface of the plastic layers becomes abrasive , especially against metallic objects.
  • the filled plastic layer preferably forms the surface of the sandwich panel at the same time.
  • filler 20-85% by weight of filler are added to the casting compound from which the plastic layers are produced.
  • Fillers with a Mohs hardness of 2.0 to 7.0 are preferably used. This includes in particular quartz flour or titanium dioxide, which give the plastic layer a very hard and scratch-resistant surface.
  • a disadvantage of this hard filler is that the surface now has an abrasive effect even on metallic objects, which is why a so-called writing effect occurs on these surfaces, ie a shifting of metallic ones Objects on these surfaces leave traces of metal abrasion that are difficult to remove.
  • Another disadvantage which is due to the hardness of these plastic layers, is the very poor machinability of such surfaces, so that sandwich panels designed in this way are recommended primarily where a prefabricated panel can be used which is no longer being processed got to.
  • Inorganic fillers whose Mohs hardness is less than 4.0, are much cheaper, especially when used in the home.
  • a typical filler which has these properties is aluminum oxide trihydrate, which although it still gives the plastic layers a hard and essentially scratch-resistant surface, is so soft that it has no abrasive or writing effect on metals, so that Especially in the household area, for example, moving saucepans on the work surface leaves no visible traces.
  • Another advantage that the inorganic filler aluminum oxide trihydrate has over quartz powder fillers is that it is easy to work with. Polymers filled with aluminum oxide trihydrate can still be processed very easily even after curing and can thus be easily adapted to the spatial conditions prevailing during installation. Sandwich panels whose plastic layers are chemically hardened are preferred.
  • a polymerisation accelerator which preferably consists of cadmium compounds and / or amines, is added to the casting compound of the plastic layers.
  • the wood material core of the sandwich panel which essentially determines the dimensions of the sandwich panel and the thickness of which allows the thickness of the sandwich panel to be selected without a large cost factor, is preferably formed from a plywood panel.
  • wood fiber board which also has the advantage that it has a relatively low specific density.
  • paper layer plates can also be used.
  • Another preferred sandwich panel has a particle board as the wood material core, which is preferred in particular because of its mechanical properties and because of its low tendency to warp.
  • Chipboard with a greater thickness in particular is preferably built up from a core with coarse chips and surface layers with fine chips. In this way the specific weight of the chipboard can be reduced, while at the same time ensuring that the surfaces of the chipboard are very smooth and without large holes and pores.
  • Formally dehyde-glued chipboard is also suitable for use in the production of the sandwich board according to the invention, but isocyanate or phenolic resin-glued chipboard is preferred, especially if the end faces of the chipboard are not covered.
  • the shining through of the wood material substrate can be eliminated by pigmenting the casting compound. Since titanium dioxide is often used as the color support in the pigmentation and since this material has a relatively high hardness, even the sandwich panels according to the invention can be used to cause one caused by the titanium dioxide particles Do not prevent the write effect. Therefore, the pigmentation of the casting compound is only recommended in combination with the use of quartz flour as an inorganic filler, since such sandwich panels inherently have a writing effect.
  • a better solution to the problem of the shimmering structure of the wooden core is to apply an intermediate layer between the wooden core and the plastic layer.
  • Various advantages can be achieved with the intermediate layer between the wooden core and the plastic layer.
  • the intermediate layer can consist of a material that is essentially impermeable to the components of the polymer casting compound. " Monomers and oligomers and any solvents present in the casting compound should be mentioned as constituents of the polymer casting compound for which impermeability is particularly important.
  • the essentially impermeable intermediate layer considerably simplifies the coating of the wood-based material core and significantly improves the quality of the sandwich panels, that swelling of the wood material core due to the absorption of monomers and oligomers and possibly of solvent present in the casting compound can no longer take place, so that the wood material core does not change its dimensions when the plastic layers are applied by swelling.
  • the intermediate layer can serve as a color support by being formed from a pigmented material, it can also be printed or dyed through.
  • the intermediate layer or the glue layer should be resistant to methyl methacrylate.
  • the paper layer preferably consists of a paper with a weight per unit area of 70 to 150 g / m *.
  • white paper the use of paper with a weight per unit area of at least 80 g / m 2 is indicated, since otherwise, with strong color differences on the chipboard surface, these i-color differences will still show through; the paper layer is possible, so that the plastic layer has a slightly spotty appearance.
  • Paper thicknesses with a basis weight of 80 g / m a and more are with your colored covering property sufficient so that the plastic layer applied on top receives a uniform white appearance.
  • a paper layer in the intermediate layer offers a very cost-effective way of producing sandwich panels with different color effects and with the property of the filled plastic molded bodies, without having the problems with the reproducibility of the coloring, as is the case with the filled plastic - Shaped bodies is the case and in particular without having to take care that the pigments harmonize with the other components of the casting compound.
  • layers of alumina trihydrate filled Kunststoffstof is avoided in soft inorganic fillers filled Kunststoff ⁇ material layers a pigment carrier such as titanium dioxide to write, "would produce a write effect on the surface of the plastic layers.
  • the translucency remains in full.
  • the layer of glue with which the paper layer is attached to the wood core expediently has a thickness of 0.1 to 0.4 mm, with a thickness of glue layer of 0.2 to 0.3 mm being usually preferred.
  • paper layers soaked or pretreated with a binder can also be used alone, for example melamine or urethane-soaked paper.
  • Optimal results with regard to the impact strength and also the temperature resistance of the finished sandwich plate are achieved with thicknesses of the plastic layer of approximately 3 to 7 mm.
  • thicker plastic layers are also possible, but the mechanical and thermal properties above the specified limit no longer improve significantly, so that a further increase in the thickness of the plastic layer is ultimately uneconomical.
  • Sandwich panels that are used as table tops or worktops and in which the end faces remain visible in the installed state are preferably provided with a cast-on edge which is formed from the same material from which the filled plastic layer of the sandwich panel is made.
  • the cast-on edge of the sandwich plate is preferably designed such that the surface of the edge merges continuously into the surface of the sandwich plate, so that there are no seams and unevenness at the transition from the edge to the plastic layer.
  • the sandwich plate obtains a particularly decorative appearance from the fact that the cast-on edge is contrasted in color, which is very easily possible with the sandwich plate according to the invention.
  • the possible variations in the sandwich panels are not only in terms of areal dimensions, a variation in the thickness of the panel is also possible without great costs, since only a " thicker core has to be used in the manufacture of the sandwich panel.
  • a variation in color the sandwich plate compared to the filled plastic mold plate very simplified.
  • the best appearance and the best material properties have a sandwich panel, which contains a chipboard as the core, onto which a coloring paper is glued using melamine resin.
  • the layers are plastic r preferably formed from a G confusemas ⁇ se as they meet at einzel ⁇ is described in DE-OS 20 06 197th
  • the essential components of the casting compound, which are responsible for the material properties of the sandwich panel, are methyl methacrylate monomer or a mixed polymerisation of methyl methacrylate with alpha-beta-ethylenically unsaturated compounds and aluminum oxide trihydrate as an inorganic filler.
  • the plastic layers have a thickness of approximately 4 mm, which is sufficient on the one hand to ensure optimum mechanical and thermal properties of the sandwich plate and on the other hand allows any variation in the color effect through the paper of the intermediate layer.
  • the sandwich panels are preferably produced in such a way that the surface has a matt appearance, which on the one hand approximates the appearance of the panel of a marble panel and on the other hand, due to a high-gloss surface, it is more insensitive to scratches, which are much easier to notice on high-gloss surfaces.
  • the sandwich panel according to the invention thus opens up the possibility of creating surfaces which correspond to the filled plastic objects and moldings according to DE-PS 20 06 197, but which avoid their disadvantages in various fields of application, so that new application possibilities are opened up for these surfaces.
  • the problems caused by the different expansion coefficients of filled plastic moldings and wooden substructures as well as in the coloring of the surface avoid the " problems with color fidelity that occur in the pure filled plastic sheets mainly when larger sheet widths due to one another different parts of the plate were created.
  • This object is achieved in that a coloring layer is applied to the side of the filled plastic layer, adjacent to the core, and that the filled plastic layer is strengthened with a layer thickness of at least about 3 mm.
  • the casting composition contains 20 to 85% by weight of the inorganic filler.
  • the inorganic filler expediently has a Mohs hardness of 2.0 to 7.0.
  • a very suitable filler for this casting compound is quartz powder, which, because of its hardness, results in an extremely robust and scratch-resistant surface of the sandwich plate.
  • a filler that has a Mohs hardness less than 4.0.
  • the filler falls alumina trihydrate, the opposite the quartz powder is much softer and therefore does not produce an abrasive effect on metal objects, so that a "writing effect", such as occurs in the plastic layers filled with quartz powder, can be avoided in the layers filled with aluminum oxide trihydrate.
  • polyester or acrylic resin is used as the polymer that builds a matrix for the inorganic filler.
  • the processability of both materials is excellent, but acrylic resin is preferred, inter alia, because of its better UV resistance and the lower price.
  • the plastic layers applied to the wood material core are preferably chemically cured so that the sandwich panels can be stored in the stacking store until the curing process has ended, the stacking stores being able to be kept at ambient temperature in contrast to thermal curing processes.
  • any wood-containing board can be used as the wood material core, whereby, depending on the application of the sandwich board, laminated wood boards, fiberboard, paper board or chipboard are used.
  • wood-based materials are again made of chipboard, the inner part of the particle board being made of coarse chips and the surface layers of the chipboard made of fine chips, so that the core of the chipboard is already Sandwich plate has a very even surface.
  • the hardened casting compound allows the base of the plastic layers to shine through and thus usually gives the surface an uneasy or spotty appearance
  • pigments are added to the casting compound, for example. This will be the case especially when quartz flours or other hard inorganic fillers are used, since these plates inherently have a writing effect.
  • pigmentation of the casting compound will generally not be carried out, because the pigments are generally based on titanium dioxide, which is a hard inorganic filler for the plastic layer.
  • Such plates also have an abrasive effect or writing effect due to the pigment addition. on the surface, which should be prevented by the choice of aluminum oxide trihydrate.
  • an intermediate layer can be chosen such that it is essentially impermeable to the constituents of the casting mass, in particular the monomers and oligomers and any solvent present, so that the wood core is swollen and distorted during production Security can be avoided and
  • the intermediate layer can serve as a color carrier, it being possible in particular to use it pigmented, printed or colored through.
  • the intermediate layer thus serves as a color carrier for the plastic layer to be applied at the top, and at the same time ensures that the color-different surface of the wooden core does not extend up to. Surface of the plastic layer shows through.
  • pigmenting or coloring the intermediate layer there is also the possibility of aluminum oxide trihydrate-filled plastic layers to be provided with a color effect without the need to add pigments to the casting compound and thus avoiding the disadvantages mentioned above.
  • the intermediate layer is preferably laminated on as a film.
  • a melamine resin, polyurethane or phenolic resin layer is recommended as an intermediate layer, all of which are resistant to methyl methacrylate and prevent the monomer from penetrating to the core.
  • the intermediate layer consists of a layer of glue and a paper layer.
  • the glue layer is again preferably applied to the core in the form of a film and covered with the paper layer.
  • the glue layer preferably has a thickness of 0.1 to 0.3 mm, a thickness of 0.2 to 0.3 mm usually being sufficient for the desired properties of the glue layer.
  • the paper layer is preferably formed by paper with a basis weight of 70 to 150 g / m 2 .
  • Thinner layers of paper can also be used use, however, these require more careful handling in the manufacture of the sandwich panels and, especially if the sandwich panel is to be white, can no longer completely cover the wood-based core underlays with their differently colored surfaces, so that the finished sandwich panel still has a slightly stained appearance .
  • Paper layers with a surface weight of 80 g / m 2 are also completely sufficient for the desired white color of the sandwich plate, so that paper with a quality of 80 to 120 g / m 2 is generally used, although of course larger paper layer thicknesses are possible, but bring no further advantages for the material properties.
  • the glue layer is first applied to the core as a film and then the paper layer is applied to the glue layer, in which case the paper layer and the glue layer are then connected to the wood material core substrate using pressure and higher temperatures.
  • a very simple and effective method is to carry out the gluing of the paper layer to the core by means of a heated plate press, similar to the way in which melamine resin coating of chipboard or veneer presses is known.
  • the preferred temperature range for gluing the paper layer to the core ranges from approximately 80 to 160 ° C., temperatures of 100 to 120 ° C. being completely sufficient, in particular when using melamine resin glue layers.
  • the plate presses are preferably operated in a pressure range of 10-25 kg / cm 2 .
  • the casting compound can be applied to the cores, with or without an intermediate layer, in such a way that the core is held in a casting frame, into which the casting compound is then introduced and distributed evenly.
  • only one side of the core can be coated with the casting compound at the same time.
  • This method is used in particular when pigmented and unpigmented casting compound is applied in separate steps.
  • a much more rational method of coating the cores with the casting compound is now that, in order to apply the plastic layers to the core, which may already be covered with the intermediate layer ⁇ first with a flat plate which is held parallel to the core surface by spacers, a mold is formed.
  • Such a mold can now be applied simultaneously to both sides of the core, so that both sides of the core can be coated in one production step.
  • the casting material is preferably pumped into a volumetrically predetermined amount into the mold, thereby ensuring that the possibly initially Deten between the gebil ⁇ by the 'spacer bearing points slightly sagging cover plate of the mold is raised again by the pressing of a predetermined quantity of potting material , so that a consistently constant layer thickness of the plastic layer is ensured.
  • the casting mold with the core is expediently tilted at an acute angle during the pumping in of the casting compound against the horizontal. It is advisable to use a hydraulic table for holding the casting mold with the core, with which such a tilting of the casting mold is easy to implement.
  • the acute angle with which the casting mold is inclined against the horizontal should be approximately 10 to 15 °, which is sufficient to achieve a completely uniform and ensure bubble-free filling of the two chambers of the mold.
  • the casting mold is expediently inclined so that it can be filled via an upper longitudinal edge.
  • Melamine-resin-coated plates are preferably used as flat plates, which allow the sandwich plate to be easily removed from the mold without a release agent being added to the casting compound or the plate having to be pretreated with such a medium.
  • glass plates can also be used as flat plates, with hardened glass being preferred here.
  • the glass plates there is a choice between a high-gloss surface of the sandwich plate or, if desired, a matt surface, in which case matted glass plates are then used.
  • the sandwich plates produced with matt glass plates have the advantage that scratches are less easily visible on their surface than on the high-gloss surfaces.
  • the spacers, which hold the plates of the casting mold parallel to the core surface are preferably attached in the edge region of the core, in which case the introduction of a volumetrically predetermined amount of the casting compound into the casting mold is of great importance, since this is particularly important in the case of large dimensions of the sandwich panel, there is much more the risk of sagging which results in the flat panels closing the mold.
  • bores are made on the end face of the core, which are continuous up to the surface of the wood material core to be coated, and through which the casting compound is filled into the otherwise sealed casting mold.
  • a separate bore can be provided for each of the two plastic layers, so that the two sides of the wood material core can be coated with different casting compounds.
  • the holes are preferably made on one long side of the core.
  • attachments in particular plastic hoses, are introduced and fastened into the bores, via which a connection is made to a pump which pumps the casting compound into the casting mold.
  • an edge covering the end faces of the core is cast onto the sandwich plate, in particular in those sandwich plates in which an edge remains visible in the installed state.
  • the edge regions of the sandwich panel containing the spacers and possibly the bores serving as sprues are preferably used before the edge is cast on severed.
  • quartz powder-filled plastic layers Special care must be taken here with quartz powder-filled plastic layers, since this material is very difficult to rework.
  • aluminum oxide trihydrate-filled plastic layers require less care when pouring the edge, since seams and dislocations that may occur in the transition area from Edge and plastic layer can be removed by a post-processing step.
  • Panels produced in this way can therefore have a seamless sealing of the wood-based material core, so that it can be used even under very rough conditions of use. conditions under which warping of the core would otherwise be expected can be used without any problems.
  • FIG. 1 is a perspective view of a sandwich panel according to the invention.
  • FIG. 2 shows a sectional view of the sandwich panel along line 2-2 in FIG. 1.
  • the sandwich panel 10 according to the invention shown in construction in FIG. 1 is constructed on the basis of a particle board 12 which has a " core 14 consisting of coarse chips and surface areas 16, 17 of fine chips.
  • the particle board 12, as it is obtained, can be used directly in the production process for the sandwich panel 10.
  • the chipboard 12 is covered on both sides over its entire surface with a melamine resin film 18 which has a thickness of approximately 0.3 mm.
  • a paper layer 20 is placed on this film layer, paper with a basis weight of 80 to 120 g / m 2 generally being used.
  • This paper can now be printed or colored through for coloring the subsequent plastic layer 22, which ideally opens up a coloring possibility for the plastic layer 22. It is particularly advantageous with this coloring option that no pigments are added to the plastic layer itself, which are generally based on titanium dioxide, so that the pigmentation of the plastic layer often results in a writing effect in these cases, which is based on a Abrasion of metal is based on the plastic surface layer.
  • the plastic layer 22 will generally have a thickness of at least 3 mm. Is mm from a thickness of about 3 already optimum Schlagfestig ⁇ ness of the plastic layer obtained above is mm by 7 * the coloring layer by the underlying Textil ⁇ be only slightly visible, which is not a problem however with white plastic layers.
  • the thickness of the plastic layer is 4 mm and the coloring of the underlying paper is still effective.
  • Fig. 2 the structure of such a mold is shown in more detail.
  • the mold is initially made up of the with the glue film 18 and the paper layer 20 coated particle board 12, on which 28 spacers 30 are placed in their edge regions.
  • a glass plate 32 made of hardened, frosted glass is then mounted on each of these spacers 30, which together with the chipboard 12 form two chambers for a casting compound for the plastic layer 22.
  • glass panels with a thickness of approximately 5 mm are preferably used.
  • the casting chambers are sealed laterally by a border or frame encircling the end faces of the chipboard, which can also be formed, for example, by a frame encircling the two surfaces of the chipboard, which also serves as a spacer 30.
  • holes 34, 36 extend at an acute angle to the surfaces of the chipboard to be coated, which are continuous from the face of the chipboard to the surfaces of the chipboard to be coated.
  • Tubes 38 are glued in, through which the casting compound for the plastic layer is filled into the casting chambers 40, 41 of the casting mold (arrows in FIG. 2).
  • the remnants of the tubes 38 remain are filled with the casting compound as sprues 24, 26 back.
  • the sandwich panels according to the invention are produced, for example, as follows: A glue layer film 18, which is covered by a paper layer 20, is placed on the untreated chipboard 12.
  • the paper layer 20 is bonded together with the glue layer film 18 to the particle board 12 in a heated plate press, the temperature of the press being 0.3 mm when using a melamine resin glue film and with a sheet of paper quality ⁇ weight of about 120 g / m 2 is kept at 100 to 120 ° C and a pressure is exerted by the press on the plate of about 12 to 20 kg / cm 2 .
  • the chipboard remains in this heated plate press for approx. 8 minutes.
  • the pressing time can be shortened to 45 seconds at a pressing pressure of 25 kg / cm 2 and a temperature of 145 ° C.
  • the chipboard is provided on one end face with bores 24, 26 which run at an acute angle to the surfaces of the chipboard to be coated and also penetrate the glue and paper layer 18, 20. In these holes, the connecting hoses 38 are then glued, which can be connected to the pump delivering the casting compound.
  • the particle board 12 prepared on both sides is then provided with the spacers 30 on both sides. which can also serve as a lateral limitation for the chamber volume of the casting chambers 40, 41. Glass plates 32 are placed on these spacers 30 and are held together with the chipboard 12 in a frame (not shown).
  • the mold thus completed is placed on a hydraulic table which is tilted from the horizontal by an amount of approximately 10 to 15 ° during the introduction of the casting compound into the casting chambers 40, 41.
  • the casting compound is pumped into the connecting hoses 38 and the casting chambers 40, 41 by a pump (not shown).
  • the casting compound is numbers in 'a volumetrisch- predetermined amount in the G gokam ⁇ 40, collected 41 "what the particular advantage is that - any" bending of the glass plates are offset by the pressing of the predetermined volume 32, so that a very gives uniform thickness of the plastic layers.
  • the molds are lifted from the hydraulic table and placed in a simple stacking warehouse, where the plates are stored until the plastic layers have fully hardened.
  • the frame holding the glass plates 32 is then removed from the casting mold and the two glass plates 32 are removed from the sandwich plate.
  • edge regions 28 of the sandwich plate which contain the spacers 30 and the sprues 24, 26, are separated.
  • This completely processed sandwich panel can now be provided in a further operation with an edge 42 which engages around the end face of the chipboard together with the end faces of the plastic layers 22 above and below the chipboard and ' preferably with its surface continuously and merges into the surface of the plastic layers without paragraphs.
  • Casting compounds in which the polymer is formed by acrylic resin and the inorganic filler consists of aluminum oxide trihydrate are preferred.
  • the content of aluminum oxide trihydrate varies from 20 to 85 percent by weight of the casting compound and is dependent on the later intended use of the sandwich panel 10.
  • the plastic layers of the sandwich panel 10 are preferably chemically cured, because then the finished cast panels are stored in a simple stack warehouse until complete hardening of the plastic layers can be left without these stack bearings having to be particularly tempered.
  • a polymerisation accelerator in the form of Cad iu compounds or certain amines is added to the casting compound.
  • Table 1 shows the results of a ball drop test of a sandwich panel according to the invention, which was produced from a 34 mm thick chipboard and 3 mm thick acrylic resin layers filled with aluminum oxide trihydrate. A 70 g paper soaked with melamine was used as the intermediate layer.
  • the size of the panels tested was 2500 mm x 1300 mm; both plastic layers were applied at the same time.
  • the metal ball used had a weight of 254 g.
  • the findings listed in the table were only to be observed in the case of obliquely incident light, but not in a vertical view. In addition, there were no cracks in the plastic layer even with a ball drop height of 1200 mm.
  • Table 2 shows the results of a stain test, the indication that it can be removed with abrasive means that the stains could be removed with household abrasion tests without leaving any traces.
  • the sandwich plate defined in connection with Table 1 was used in these tests.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)

Abstract

Un panneau sandwich comporte une âme constituée d'un matériau dérivé du bois (12) et agencée entre deux couches de plastique (22), dont au moins une renferme une charge inorganique. Afin de permettre l'amélioration des caractéristiques de coloration, une couche chromophore (20) est disposée sur les côtés de la couche plastique chargée, au voisinage de l'âme, l'épaisseur de ladite couche plastique chargée n'étant pas inférieure à environ 3 mm.
PCT/EP1989/000538 1988-05-20 1989-05-17 Panneau sandwich et procede pour sa fabrication WO1989011240A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19883817224 DE3817224A1 (de) 1988-05-20 1988-05-20 Sandwichplatte
DEP3817224.0 1988-05-20
DEP3817182.1 1988-05-20
DE19883817182 DE3817182A1 (de) 1988-05-20 1988-05-20 Verfahren zur herstellung einer sandwichplatte

Publications (1)

Publication Number Publication Date
WO1989011240A1 true WO1989011240A1 (fr) 1989-11-30

Family

ID=25868275

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1989/000538 WO1989011240A1 (fr) 1988-05-20 1989-05-17 Panneau sandwich et procede pour sa fabrication

Country Status (2)

Country Link
AU (1) AU3690189A (fr)
WO (1) WO1989011240A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4233050A1 (de) * 1991-10-01 1993-04-08 Svoboda Moebelwerk Platte
FR2706664A1 (fr) * 1993-06-17 1994-12-23 Delabi Emile Procédé de réalisation de panneaux signalétiques & enseignes publicitaires.
WO1999004972A1 (fr) * 1997-07-26 1999-02-04 Schock & Co. Gmbh Materiau sous forme de panneau
CN1058930C (zh) * 1997-06-23 2000-11-29 南京邮电通信设备股份有限公司 适用于片状模塑料的不饱和聚酯、玻璃纤维箱体制作工艺
EP1388414A1 (fr) * 2002-08-05 2004-02-11 Composites Gurea, S.A. Panneau stratifié pour revêtements extérieurs
FR2868733A1 (fr) * 2004-04-09 2005-10-14 Faurecia Interieur Ind Snc Materiau composite en feuille thermoformable pour garniture interieure de vehicule automobile dote d'une feuille de bois decoratif, element de garniture de vehicule comprenant un tel materiau, et procedes de fabrication associes
WO2012009528A1 (fr) * 2010-07-14 2012-01-19 Biovation, Llc Ensemble composite biostratifié et procédés associés
US8389107B2 (en) 2008-03-24 2013-03-05 Biovation, Llc Cellulosic biolaminate composite assembly and related methods
US8652617B2 (en) 2008-03-24 2014-02-18 Biovation, Llc Biolaminate composite assembly including polylactic acid and natural wax laminate layer, and related methods
FR3017821A1 (fr) * 2014-02-21 2015-08-28 Plan Franchise Distrib Panneau composite et procede de fabrication afferent

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH363267A (de) * 1958-12-16 1962-07-15 Hasse Heinrich Verfahren zur Ornamentierung von Platten und danach hergestelltes Erzeugnis
DE1904362A1 (de) * 1968-01-31 1969-09-04 Cartiere Ambrogio Binda Spa Verfahren zur Herstellung von Dekorplatten
EP0166153A1 (fr) * 1984-05-17 1986-01-02 Hoechst Aktiengesellschaft Panneau décoratif à propriétés de surface améliorées

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH363267A (de) * 1958-12-16 1962-07-15 Hasse Heinrich Verfahren zur Ornamentierung von Platten und danach hergestelltes Erzeugnis
DE1904362A1 (de) * 1968-01-31 1969-09-04 Cartiere Ambrogio Binda Spa Verfahren zur Herstellung von Dekorplatten
EP0166153A1 (fr) * 1984-05-17 1986-01-02 Hoechst Aktiengesellschaft Panneau décoratif à propriétés de surface améliorées

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4233050A1 (de) * 1991-10-01 1993-04-08 Svoboda Moebelwerk Platte
FR2706664A1 (fr) * 1993-06-17 1994-12-23 Delabi Emile Procédé de réalisation de panneaux signalétiques & enseignes publicitaires.
CN1058930C (zh) * 1997-06-23 2000-11-29 南京邮电通信设备股份有限公司 适用于片状模塑料的不饱和聚酯、玻璃纤维箱体制作工艺
WO1999004972A1 (fr) * 1997-07-26 1999-02-04 Schock & Co. Gmbh Materiau sous forme de panneau
EP1388414A1 (fr) * 2002-08-05 2004-02-11 Composites Gurea, S.A. Panneau stratifié pour revêtements extérieurs
ES2219167A1 (es) * 2003-01-24 2004-11-16 Composites Gurea, S.A. Tablero estratificado para revestimientos exteriores.
FR2868733A1 (fr) * 2004-04-09 2005-10-14 Faurecia Interieur Ind Snc Materiau composite en feuille thermoformable pour garniture interieure de vehicule automobile dote d'une feuille de bois decoratif, element de garniture de vehicule comprenant un tel materiau, et procedes de fabrication associes
US8389107B2 (en) 2008-03-24 2013-03-05 Biovation, Llc Cellulosic biolaminate composite assembly and related methods
US8652617B2 (en) 2008-03-24 2014-02-18 Biovation, Llc Biolaminate composite assembly including polylactic acid and natural wax laminate layer, and related methods
WO2012009528A1 (fr) * 2010-07-14 2012-01-19 Biovation, Llc Ensemble composite biostratifié et procédés associés
FR3017821A1 (fr) * 2014-02-21 2015-08-28 Plan Franchise Distrib Panneau composite et procede de fabrication afferent

Also Published As

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