PROCEDURE FOR THE UBERZIEHEN AND LOCKING THE EDGES OF PLATES

The invention refers to a procedure for the covering and locking (seal) of the edges of porous materials, like from particles or fibers existing plates and ähnl. Products on basis of Z more ellulosemater ialien. It is a general problem that disk materials of the kind mentioned porous edges can be possessed and not painted accordingly, before these edges were not cemented or a cover strip e.g. by means of an adhesive on them were attached. At present even in large-scale enterprises of the furniture ore confining cementing the plates “fronts is implemented manuall, what requires very much time and work expended. The strips are attached to the majority in the carpenter workshops and in the furniture factories with the help of an adhesive, but this is for the Überi0 draws the edges a relatively expensive alternative. The strips are fastened frequently with the help of a so-called hot-melting adhesive, which is solvent sensitive wärmeund; therefore the gluing can erweiehen and the strips can sees ven the edge with drying the lacquer at increased temperature to replace, it was also suggested covering the disk edges with thermoplastic polymer materials which up to the liquefaction heated up and mi assistance of rollers heated up od. such are laid on, in order a smooth surface or such with a desired profile to receive. Is also here the sensitivity of the thermoplastisehen coat to warmth and solvent of disadvantage and therefore is also this procedure was in practice not used. It is well-known to strengthen the edges and corners of Faserund cleaning plates by impregnating the edges with a reinforcement means, like also warm-hardening Harnetoff and phenolic resins. Impregnating takes place via dipping, syringes or covering, in order to achieve a stronger penetration into the porous layer. From there a low viscose rayon, filler-free solution of the warm-hardening resin must be used. Hardening the resin is accomplished in a heating furnace. In this way meanwhile no impermeable and smooth edge surface is received and it must be cemented before painting. It was also suggested sealing bar ends by treatment of the bar front surfaces with unfilled and unmodified urea formaldehyde resins. The experience shows however that such resin layers become fragile and in the course of the time Hisse gotten and that the film from the warm-hardening resin becomes leaky. Beyond that it is well-known to strengthen the edges from plates consisting of teilchenförmigem material to by pressing a bonding agent under pressure into the edge surfaces, whereby one ugen different Injektionseinrich used, which are gebraeht in close contact with the Kantenoberfläehe. As bonding agents animal or vegetable glues are used. This method is too complicated, requires an expensive Einrichümg and supplies no smooth edges. The procedure according to invention is the one warm-hardening thereby marked that the edges are covered with a solution or a dispersion, and a thermoplastic resin, a hardener, a filler as well as a FormtrennmitteI and (or) a pigment contains if necessary and the one viscosity between 4000 and 300,000 cP exhibits, so that a limited penetration into the porous parts of the edges takes place and a smooth, a close and caperable surface after hardening develops. The warm-hardening resin can be a Harnstoffoder melamin resin. In some cases also PhenoIund of Resorzin resins can be used, if no bright (brownishly did not discolour) layers are necessary. As thermopIaetische Kempenente can be used Polyvinylacetat, ethylen - VinylaeetatCopolymeren, Polyaorylsäureester or Polymethacrylsäureester. As FüIlstoff are applicable kaolin, wood flour or barium sulfate. As mold lubricants Metallstearateoder oleatewie Zinkstearat can be used and/or or ammonium oleate. As pigment titanium dioxide can know and as hardener ammonium salts to be used. The viscosity of the solution or Dispers [on is to be adapted to porosity the diskchewed which can be covered. Very porous cold ones require a solution of high viscosity and less porous edges a solution or a dispersion of relatively low viscosity. It can vary thus the viscosity of the solution of the modified warm-hardening resin and/or the dispersion within far borders, e.g. from 4000 to 300000 cP, preferably between 70000 and 150,000 cP. During the production of the solution or dispersion one goes out preferably of two components A and B, which are mixed with one another before the use in same portions. The component A consists of the solution of the warm-hardening resin with additive of anorganiscben and/or or organic fillers, and those component B consists a figuration running memo ice if necessary of the Dispersen of the thermeplastlschen resin with additive of a hardener, inorganic fillers and. The composition of the edge-sealing according to invention manufactured solution or dispersion can lie within the following limit values (in thread - parts): Warm-hardening resin (Vorkondensat) 5 to 30, thermoplastic resin 1 to 10, hardener O, 2 to O, 6, filler 45 to 90, Formtrermmittel 0 to 1, pigment 0 to 1, water 8 to when using kaolin as filler and after mixing the components A and B will receive a solution or a dispersion with thixotropen characteristics, which prevents the drain of the applied solution or dispersion of vertical surfaces (edges). Further with pressing and heating up it is worked against to a too deep penetration into the porous parts of the edge and it becomes prevents that the pressed out surplus of the solution or dispersion close lying close parts of the disk surface soils. The modified solution or dispersion of the warmhäßenden resin can be applied on the edges with the help of a spraying nozzle or a Walzenoder order for slot. Pressing and hardening the plastic solution or dispersion can be ausgefiihrt with the help of a metal strip. In order to prevent that the solution or DispeÆsion at the metal adheres, it can contain the solution or dispersion a Formtrennmißel and/or or the metal strips or - bound can with such, e.g. with Tel2on, be covered. B e i s p i e 1 1: In the following table the composition of three Kantenabdichümgsmischungen I, II and III is shown according to the invention, whereby itself all parts on thread - parts refer. Urea formaldehyde resin Polyvinylacetat titanium dioxide Farbpigment kaolin Holzmeb! Barium sulfate Zinkstearat A mmoniumoleat ammonium chloride water 11.7 4.4,4.2,1.1 65.1 0.2,0.3,0.4 12, 6 10.7 2.7,8.7,8.7,0.8 55.6 0.3,0.3,0.3 11, 9 IH 10.7 2.7,8.7,6.0,6.7,0.7 49.7 0.3,0.3,0.3 13.9 the viscosity of the solutions or dispersions lies between 70,000 and 150,000 cP. Received smooth Kantenüberz'üge, which needed after the creation on the edges covered by plates, with Faserplaßen, consisting of particles, presses with a pressure of approximately 5 kp/cm2 and hardnesses with 160oc during 15 s seals and only one painting coat. B e i s p i e I 2: Two solutions or dispersions were confessed according to the deep-standing table, from which only a thermoplastic component contained. Harnstofformaldehydharz polyvinylazetat kaolin wood flour barium sulfate Zinkstearat ammonium oleate ammonium chloride Wassor IV v 12.1 3.0 10.0 0.9 62, 0,0.3,0.2,0.3 11.2 12.1 i0,0 0.9 62, 0,0.3,0.2,0.3 14, 2 the edges of a plate of 22 mm of thickness, consisting of particles, with these solutions or dispersions was covered, with a pressure of approximately 3 kp/cm injected and with 160°C 30 @ long to-hardened. A drop butyl acetate was given on in such a way treated Kantenoberfläehen and the time up to the complete penetration was determined with 350 to 450 s and/or 60 to 80 with treatment with the solution or dispersion IV and/or V. The result show that coats with solutions or dispersions, which contained thermoplastic components were considerably closer than such without this Kemponente. Butyl acetate is a solvent frequently used in lacquers. B e i s p i e 1 S: Production ven edge sealing materials by mixing same thread - portions of two components A and B. Composition of the Komponento in thread - % A B A+ B Veräthertes MelaminFormaldehydVorkondensat (dry weight) Polyvinylacetat (dry weight) barium sulfate other Fü! lstoffe Zinkstearat ammonium oleate A w w onin numerical control klo r ID water 48 14 8 14 0, 0, 0, 16 4 8 8 54 14 0.2,0.4,0.4 12 a 78%ige aqueous solution of a verätherten Melamin formaldehyde Vorl of zndensates, with methanol up to a Varätherungsgrad of 0, 6 to 0, 8 veräthert and with good storage characteristics was used. The degree of the Verätherung means the relationship between the number of the hydroxyl groups and the number of the Äümrgruppen in the molecule. Polyvinylacetat was added in form of a 56%igen aqueous, electrolyte-stable dispersion. The viscosity of the mixture A+B amounted to about 1,000 cP and the pH value about 7. The mixture was 24 h usable and hardened after their Aufbrlngung on the edges after 20 s with 160o¢. The chewing coats were closely and directly paintable.