DE904469C - Process for the production of cork stone baked with its own resin - Google Patents

Description

Process for the production of cork stone baked with its own resin For the production of molded pieces from cork, various processes are known which depending on the desired properties and the intended use of the fittings differentiate. So z. B. pressed cork panels, as they are primarily used as flooring Use made of crushed raw cork, which may be steamed or with Water soaked through can be produced by placing the cork in a mold compresses under the application of pressure, after completion of the pressing process by the action of heat dries and splits the compressed cork block thus obtained into thin plates. Included It has also been proposed to use several of these thin plates to the desired size Strength to stack again, to subject again to a pressing process and the Connection of the individual layers at a low drying temperature by a suitable binder and at high drying temperature taking advantage of the to effect the distillation products escaping from the cork. Cork stone, which is predominantly is used as insulating material for cold rooms, cooling containers and cooling pipes, is either as a so-called impregnated cork stone made of pre-expanded cork with a binding agent or as a so-called baking cork without adding a binding agent manufactured.

While for the production of impregnated cork stone recently Even continuous processes have become known, baking cork is still after the process known for almost 50 years by comminuting Presses raw cork into molds and exposes the closed molds to temperatures that below the evaporation temperature of the resins contained in the cork, but above that Evaporation temperature of the other volatile organic contained in the raw cork Components lie. In this process the latter evaporate Ingredients, while the resins in a highly fluid state to the outer wall of each Cork grains migrate and when cooled to normal temperatures a good binding agent for the cork grains. So far, only to improve this process it has been proposed to work with inert gases or vapors and these gases or to introduce fumes into the molds by direct contact with the cork grains to accelerate the process.

Also this improved process for the production of so-called Backkorl has the disadvantage. Id that each plate must be pressed in a shape and that consequently a large number of plates is required, the manufacturing process lengthy and costly.

According to the invention baking cork is made using a continuous running belt press. For this purpose, the cork grist between the continuously running belts pressed and the pressed granulate forthewegr. Through the perforated Belts of the press are inert gases of a correspondingly high temperature in the pressed Granules pressed and, if necessary, sucked off on the opposite side. This causes the liquefaction of the resins and the evaporation of the rest in the granules volatile organic components contained. When cooling down solidify those that have become highly fluid and migrate to the outer wall of the individual grains Resins and bring the cork grains together to form a solid body.

It has been found to be particularly advantageous for the cooling to take place and to accelerate the binding of the cork mass, that one in the same operation conducts cooled, inert gases or vapors through the cork mass in a second zone, which then exits the belt press cooled to outside temperature and passes through a special automatic sieving device cut to the desired size can be.

The granulate fed to the continuously running belts can thereby be preheated to further speed up the process. The heating and cooling flows can in the passage through the continuously moving and pressed Granules are kept like this. that they only have a slight effect on the outside air Have overpressure. In addition, heating and cooling flows can be circulated and set up in this way be that they alternately move the continuously moving pressed granules penetrate from top to bottom and from bottom to top.

Superheated steam and Cooling of saturated steam hzw. only slightly superheated steam can be used.

Finally, the continuously running belts at the points of contact with the granules covered with insulating materials in order to derive the to prevent applied amounts of heat in the belts.

According to the method according to the invention, it is possible to use baking cork a relatively small machine much faster and more economically to produce, as if one made every single shaped piece in a special shape, as required by the known methods.

Claims (8)

PATENT CLAIMS: I. Process for the production of in-house resin baked cork stone, characterized in that between continuously running Ribbons of crushed cork pressed together without a binding agent and by means of the pressed together Cork mass passed through, highly heated, inert gases is baked together. 2. Process for the production of cork stone baked in its own resin, characterized in that to accelerate the cooling and binding of the preferably pressed together between continuously running bonders and highly heated, inert gases heated basket mass in the same operation, cooled, inert gases are passed through the mass. 3. The method according to claim I, characterized in that the the Cork meal fed to continuously moving belts as high as possible, however preheated while avoiding the expulsion of the cork resins necessary for setting will. 4. The method according to claim I and 2, characterized in that the Heating flow and / or the cooling flow when passing through the continuously moving, Pressed cork mass compared to the outside, air only slightly overpressure. 5. The method according to claim I and 2, characterized in that Ider Heating current and / or cooling current are circulated. 6. The method according to claim 1 and 2, characterized in that the Heating current and / or the cooling current alternately from top to bottom and the cork mass inversely penetrate. 7. The method according to claim I and 2, characterized in that for Heating of the cork, superheated steam and, for cooling, saturated steam or only slightly superheated steam is used. 8. The method according to claim 1 and 2, characterized in that the run around the tapes at the points of contact with the cork mass with insulating Materials are occupied, which conduct the heat poorly. Attached publications: German plateau No. 288 319.