DE1933662A1 - Method and device for covering an essentially flat surface of an object with a cover layer - Google Patents

Description

Dr. Werner Koch Dr. Richard Giawe 193366? Dipl.-Ing. Klaus Delfs ^{v 6}

Dr. Walter Moll
Patent attorneys

Munich 22
LiebberrKtr. 20

Method and device for covering an essentially flat surface of an object with a cover layer

For many different building and construction elements, materials are used that have strength and processing properties and price are considered advantageous, although they do not have the most advantageous surface properties. \ föis-3n. This handicap is usually remedied by that the object is provided with a suitable cover layer, for example it has been known for a number of years. iiolz.fi'.lohen with a surface layer of a dye anr.'cric'ii to be provided. One is still striving to paint against various mechanical and chemical influences v / iderstancfefcüiig. In recent years there have also been several objects, especially wooden panels, with a top

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surface laminate made of particularly resistant material. Such surface coverings have in most cases a purely technical purpose. Often, however, aesthetic considerations are also important. In certain cases such surface coverings are used exclusively for aesthetic reasons.

A wide variety of methods are used to cover the surface of an object with a top layer, but all of them are more or less cumbersome and require a relatively large amount of work or complex machinery. For example, large, powerful presses are required to produce wooden panels with a surface laminate made of hard and very durable plastic, and effective and often very expensive types of glue must also be used to connect the panel itself to the surface layer. . . _;

The invention relates to a method for allocating -this in .wesent-, planar surface of an object with a loan, and · top layer is based on the E _r knowledge that particularly with planar surface Very simple an effective surface area can be achieved. Flat surfaces are often found on objects provided with a covering of the aforementioned type. In the construction industry in particular, many Holaplatten are used for surface covering * .. their use and distribution are limited solely by the price. ■ - -. ·

iiüiv .; ;; it is £ .indungsgemäss achieved by iläch ^ nnelägfi mi £ planar surfaces that serves to form the outer layer powder, such as fine plastic powder by contactors - a.nei .ie, e-infaaneund ^ cheap manufacture soldier upper

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- S.

The sieve is evenly sprinkled on the horizontal surface, ^f and that the powder layer is heated to a temperature at which the powder flows into a cohesive top layer. It has been found that with the help of a vibrating sieve, the powder can be distributed so evenly that when heated it forms a completely evenly distributed, cohesive cover layer that is firmly connected to the surface of the object. The layer thickness can be adjusted as required so that a surface with the desired properties is obtained.

To ensure effective adhesion of the powder to the surface of the article, the surface can be pretreated according to the invention before the powder is applied to improve the adhesion of the top layer. The desired improvement in the adhesion of the overcoat according to the invention can take place in that by providing the surface before applying the powder with an adhesive layer or the surface aufkratzt, it that receives the setting of required with the powder roughness.

According to the invention, the top layer can be produced by two or more successive applications of powder, with each application being heated.

In order to achieve a hard, smooth surface, it can be useful in accordance with the invention to rapidly cool the surface layer or the last surface layer applied after heating, preferably by means of a stream of cold air.

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The invention also relates to a device for implementation of the method, which is characterized in that it has conveyors for continuously advancing a Has object under a vibrating sieve, which consists of a trough with a perforated, gate in part reticulated, curved ground, whose center of curvature is above the Floor lies. -It has been found that when using a vibrating sieve designed in this way, an extraordinary uniform supply of the powdery substance guaranteed is. According to the invention, the sides of the trough can be at an angle from 50-100 ° with each other.

According to the invention, the sieve bottom can expediently essentially be have a hyperbolic cross-sectional shape, whereby according to the invention on two-way trough the tangent surfaces of the sieve code form. The material slides unhindered down the trough and -.- gets into the trough without the risk of clogging scattered in equal distribution. The device can. According to the invention organs for .: distributing the powder in the longitudinal direction of the "jroj-shaped vibration sieve, so that a possible irregular loading of the trough with the rieterial is irrelevant.

7'ie ;;? "· Ιindur," virc explained in more detail below with reference to the drawing, which soher.iB table shows a device according to the invention.

The device according to the invention consists of a horizontal "conveyor belt 1 for conveying a continuous row of plates, for example wooden plates 2, a nozzle 3 located above the belt for spraying an adhesive, a trough-shaped vibration sieve 4 with a cross-section liy-

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BADORIGtNAi

perbolic sieve bottom 5 and from a radiant heating unit 6 aur thermal treatment of the substance 7 applied to the plates 3 with the aid of the vibrating screen 4. Ausserdeni has the device has a further Vibrationssieh 8, with which a further layer of material 9 can be applied, the can be heated by means of a radiant heater unit 10. At the outer end of the conveyor belt 1 there is a cold air nozzle 11.

Appropriately usable substances are, for example, thermoplastic substances which become fluid when heated and form a flat layer which then hardens when cooled. There are thermosetting materials, for example Zweikomponent substances used, the two components are in powder form JIit ^1, mixed together, by heating and melting together aur formation of a hard surface layer chemically react with each other.

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Claims (1)

Claims. A method for covering an "essentially flat. Surface of an object with a cover layer, characterized in that a powder, for example fine plastic powder, used to form the cover layer is evenly scattered by a vibrating sieve onto the horizontal surface," and that the powder layer is heated to a temperature at which the powder flows into a cohesive cover layer. 2. The method according to claim 1, characterized geke η η ζ eic hn et that the surface of the object is pretreated before the application of the powder to improve the adhesion of the top layer. . . . . · 3 · The method of claim 2, characterized gekennzeic h- ~ _r net that the surface prior to application of the powder, an adhesive layer is provided. - 4. The method according to claim 2, characterized in that that the surface is scratched off before the powder is applied. . ■. · "■.." - 5. The method according to claim 1, characterized in that g e k e η η ζ e i c hnet, that the top layer is produced by two or more successive applications of powder, and that with is heated each time it is applied. . 6. The method according to claim 1 or 5 »characterized g eke η η ζ eic η e ty that the surface layer or the last applied surface layer after heating, preferably by means of a 909802/1380 BADORtGiNAL Cold air flow is quickly cooled. ι η ο οrη ο I α ο 6 bb L 7. VorrichturlG sur implementation of the method according to claim 1, characterized in that it includes a conveyor device for the continuous advance of an object has a vibrating sieve, which consists of a trough with a perforated, preferably reticulated, curved bottom, whose center of curvature lies above the ground. 8. Apparatus according to claim 7, characterized gek.ennse i c hn e t that the sides of the trough form an angle of 50-100 with each other. 9. Apparatus according to claim 7 or 8, characterized in that g e k e η r. ze i chnc t that the sieve bottom i: .i essentially a hyperbolic ^ has a cross-sectional shape. 10. Apparatus according to claim 9? thereby ge 1: e η η ζ eic; in et that the ⁿ rog sides form tangent surfaces of the sieve bottom. 11. The device ncch claim 7, characterized ^e ζ - ^He - ^r - - ^e - ^c - "η et they organs Suu distribution of the powder in the La.n · ~ srichtung of trogformigen" ibrationssiebs aufv.-eist. . BAD OPIIGINAL 909882/1380 <f L e r s e i t e