DE225896C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- Yes 225896 CLASS 75 c. GROUP

SAMUEL HORWITZ in BERLIN.

Patented in the German Empire on April 20, 1909.

The procedure described below relates in particular to treatment of veneered panels or panels made from veneers.

So far, so-called wood fillers have generally been used for priming, i.e. H.

powdery substances that are mixed into a paste in oil, turpentine, alcohol, etc.

The imperfection of this known method resides in the fact that only the liquid penetrates into the wood and the undissolved, actually intended for filling the wood Parts only penetrate into real openings (pores) of the wood, but not into the dense mass; Otherwise, the filling parts remain more or less on the surface and are rubbed down again when sanding down.

As a result, the later polishing liquid (resin solution) must of course be used as a pore filler serve and a large consumption is inevitable.

Furthermore, there was the disadvantage that the wood that had been sanded before was roughened again by this treatment.
The shortcomings of this previous method are that

ι. the physical pore filler is not a wood filler,

2. that the substance of the wood filler remaining on the surface is replaced by the following Grinding is rubbed down again,

3. that the wood filler may be brought back into solution by the resin solution,

4. That a large amount of resin solution is required again later to saturate the wood and to give it the necessary hard ground for the actual glossing by varnish or polish.
.. Dissolved casein has also been suggested as a primer. However, this remained unchanged and could not remedy the defects which adhere to all these soluble wood or pore fillers. The use of quark mixed with lime has also been proposed, but this mixture also fulfills, since it does not form a solution at all, but an emulsion, not the purposes which are achieved in the process of the invention. The use of lime is also completely unsuitable because it sticks to the wood surface as a body, stains it darkly and corrodes the later lacquer and polish coatings.

The invention consists in the following process:

The pre-sanded wooden surface is coated with a protein solution, to which albumin or casein and water are used, in which casein one of the usual solvents is applied with. Such a solution is thin and more or less forms an impregnation liquid; she penetrates consequently both in the pores and in the dense mass of the wood and changes not its appearance, even if, as with every contact with the sanded wood Liquid, a certain roughening occurs.

As soon as the paint has dried sufficiently, the wooden panel will be between over ioo ° heated rollers performed with solid prints; you can of course also use heated ones Use presses. Here the protein coagulates and at the same time the applied protein layer becomes horn-hard and shiny and at the same time the fournier surface is smoothed.

The wood is now waterproof

ίο top layer, the roller has the surface in perfectly, even, matt-reflecting way smoothed or flattened; it's the pores and the dense mass of the wood completely closed by the pressure and the heat.

The lacquer or resin or shellac solution that is now applied during polishing remains Completely on the surface, cannot penetrate the wood anywhere, cannot hit that solidified protein act dissolving, and there the smoothness brought about by the rolling a much greater one than can be given to it by any grinding, so the paintwork or polish is instantly uniform and impeccable; it dries quickly on, as they do not contain any absorbing substances or substances that interfere with the drying process is found, and the desired effect is half or a quarter of what would otherwise be applied paint material achieved in a perfect way.

The characteristic of the process is that you wood panels with a heat-transformable primer layer, which provides against the subsequent Polishing material is resistant.

Rolling under heat serves a double purpose, on the one hand to use the egg white To bring curdling and on the other hand to the previously necessary regrinding or grinding save by having a satin finish on the wooden surface and protein layer in its place. It has already been mentioned at the outset that this type of treatment allows the connecting surfaces Protect the wood against external influences and thus prevent later blistering or the panels from being thrown can. It is therefore also advantageous to treat the free end faces of the woods in the same way, because then a all-round protection of the wood against the ingress of moisture etc. is achieved. This handling The front surfaces are best carried out in such a way that they are primed with protein-containing solutions or emulsions the end faces of the timbers against a rotating roller with the application of heat runs in the opposite direction, with the conversion of the primer material being caused by the heating and at the same time a smoothing of the top layer is ensured by the pressure.

Claims (1)

Patent claim: Process for priming wooden panels by treating them with a protein containing pore filler applied to the pre-sanded wood, characterized in that the treated in this way Wood is exposed to the action of heat and pressure, causing a transformation (Coagulation) causes the pore filler in the upper layer of the wood and at the same time smooths the impregnated Area is brought about.