DE741090C - Process for the production of sealing plates - Google Patents

Description

Method of Making Gasket Sheets The invention relates to a process for the manufacture of elach seals for high performance, in particular Cylinder head gaskets for internal combustion engines. The influences that this too. have to resist are therefore essentially: higher, possibly more rapidly changing Pressure in all directions, high dry or wet heat, dissolving effect of oil, Gasoline or other hydrocarbons, water and water vapor. Besides, it can required or distributable under today's economic conditions be to use exclusively or mainly domestic raw materials, and largely inexpensive.

The best-known plate-shaped seal is made from asbestos fibers, Fillers and rubber (binders) existing it-plate are sufficient, however, because of their high rubber content does not meet the above requirements, since the rubber through Heat destroyed, dissolved by oil or hydrocarbons, or by water or steam is bloated. The rubber-asbestos mass is destroyed particularly quickly in explosion engines, where e.g. B. on the narrow webs between water passages and compression chambers the influence of dry heat, pressure, water and oil at the same time works.

Therefore, the one used to set the sealant is heretofore Rubber to such an extent by specially selected resins that are sufficiently heat-resistant and also oil and gasoline resistant, that replaces the solubility of the finished Seals is lifted to a sufficient extent.

After all, it is necessary when looking for what is known per se Procedure i (see e.g. Ullmanns Enzyklopädie. 2nd ed., Vol. 1, pp. 636, Vol. 3, 5. 680, Vol. 6, p. 513) wants to produce plates on the rolling value that Mass to give a small admixture of rubber or synthetic rubber, which the Roll out into a peelable layer or

Plate allows. However, this rubber content can be compared to the for It plates heretofore usual percentages up to a practical in the above sense harmless amount can be reduced if one proceeds in the rolling process in this way, that you first of all apply a very thin base layer on the heated salander roller the well-known, rubber-bound It mass and only then with the new one Work on the mass in the usual way. The steam pressure for heating the a roller is expediently limited to about 3,; tü. The finished panels can then be used for a longer period of time, e.g. B.

I to 3 hours, subjected to a heat treatment, until if necessary curable resins used lose their solubility completely. If necessary a pressure can be applied.

The plates obtained in this way now meet the requirements set at the beginning; because as a result of the reduction in the content of rubber or synthetic rubber and its replacement with selected resins, hydrocarbons and essential Withstand higher temperatures to a large extent, the desired increased resistance will be achieved brought about the seal. If necessary, it can be treated with additional heat the plate can still be secured.

To improve the thermal conductivity and strength, one can use the plates fine iron or metal fibers or particles in a manner known per se or the like, or in a manner known per se, a dense wire mesh (or metal-fiber mesh roll in.

For reasons of economy (raw material discount or restriction on domestic fabrics) one can determine the percentage of rubber or synthetic rubber in Reduce the mass until it completely disappears and replace it with resins. Furthermore can the asbestos through substances such as talc, magnesia, graphite, barite, silicates or, as far as possible, by specially treated glass or slag wool, fine Eislen or Metal threads or particles and other strand-resistant or made heat-resistant Substances of the same effect are replaced.

This mass cannot be made into plates as such on the rolling mill Layers) ausalzell, but it is always a tissue 0.

Basis for the rolling process required. In this case, go proceed as follows: The metal or metal fiber fabric produced in long strips are fed to the Ralander rollers under drum-head-like tension. Under hollow Print is first from one side and then after going through and turning over the Gewebebabn from the other side one of the sealing compounds described above one and pressed, in such a way that just the pores of the relevant Tissue are completely closed. Not due to the higher resin content of the mass but every heating of the rollers so that the resin does not become sticky during the rolling process.

About the pressing in and pressing of the mass and the adhesion of the same as well To improve the impermeability of the fabric, this can be done beforehand appropriately are impregnated. The impregnation can be done on a coating machine as well can also be done on the calender under relatively low pressure. The viscous one Impregnation compound is applied on both sides.

After the rolling process, the web is thoroughly cleaned under the action of heat dried out and subjected to heat treatment until used if necessary curable resins lose their solubility.

Finally, it is under high pressure on both sides, but at cold rolls, graphitized on the calender. Resin can also be added to the graphite, if necessary hardenable resin, so that the solubility of the graphite cover is also prevented will.

Instead of producing entire webs on the calender, smaller ones can also be used Produce sealing plates with the help of presses, if necessary hydraulic presses. In order to avoid waste, the seals can also be used immediately in appropriate forms produce yourself in the pressing process. One of the above can be selected at will Mass is used in this pressing process, possibly also with a fabric insert. The production can be done in a known manner under the action of pressure and heat. However, longer heating at higher temperatures can also occur after pressing take place so that a complete insolubility is brought about.

Claims (2)

PATENT CLAIMS: 1. Rolling or pressing process for the production of Sealing plates with or without a fabric insert made of wire or fibers or combinations both where the solid constituents of the sealant are fibrous materials, such as Asbestos, slag wool, specially prepared glass wool or the like, and / or powdery Fillers such as talc, magnesia, barite, silicates, etc., are made of hardenable Synthetic or natural resin existing binding agent a part facilitating the rolling out can be admixed with synthetic or natural rubber, characterized in that on the heated calender roll or in the mold initially a wafer-thin, a few hundredths Millimeter thick base layer made of rubber or. Synthetic rubber set sealant and then the one set with resins Sealant is applied. 2. Rolling process for the production of gasket sheets with fabric insert made of wire or fiber, or combinations of both, where the solid stock parts of the sealant fibrous materials. like asbestos, slag wool, special Prepared glass wool 0. The like, and / or powdery fillers, such as talc, Magnesia, barite, silicates or the like are and are made from curable synthetic or natural resins A small amount of synthetic or natural rubber is added to existing binders can be, characterized in that on the tensioned, impregnated fabric web The mass is applied on both sides by cold rollers and after the salting process the web is dried out under the action of heat but without pressure. To distinguish the subject of the registration from the state of the art the following publications have been considered in the granting procedure: German patent specification No. 189 572, 223 714, 507 962, 537 865, 553 563, 628 969, 641,968; Artificial organic materials, chemical structure and manufacturing processes, Dr. habil. Erwin Santer in issue No. I, Kunst-und Preßstoffe (1937), V. D. J. Publisher G. m. B. H., - Berlin; Chemical technology of modern times, 2nd ed., 1993, vol. 4, p. 184.