Tyrolit Schleifmittelwerke Swarovski K.g.

Harald Helletsberger

Walter Waizer

Volker Selgrad

Christof Kriegshaber

Herwig Pichler

Hermann Plattner

Bernhard Fugenschuh

Peter Tobias

Anton Aichhorn

Ernst Geissler

Monika E Oberleit

Wolfgang Huber

Ute Nalter

Erich Bogusch

Heinrich Ofer

Anselm Kaspar

Sample box

An abrasive disk comprising abrasive grains such as corundum, a bonding material, for example a resin, and a filler material. At least part of the filler material is active in the grinding process. Particles of this filler material are provided in the disk in the form of pellets or granules. The pellets and granules preferably consist of more than one substance. One substance forms a matrix and at least one other substance is imbedded in said matrix.

Grinding disk

An improved method for coating fibers, for example, glass fibers, which are used in reinforcement webs for objects under high strain e.g. in grinding discs. The fibers are subjected to a two stage coating. In the first stage the fibers are coated with a liquid resin or resin solution. In the second stage resin in powdered form is deposited on the fibers. Thereafter, the fibers are subjected to a heat treatment. The products obtained are tacky to the touch and are used in this state in other mixtures of resinous binders and the like so that a good contact is made between the reinforcing material and the additional binder.

Method of coating fibrous reinforcement material

Abrasive grain, corundum (Al.sub.2 O.sub.3) comprising titanium oxide, preferably Ti.sub.2 O.sub.3, is provided with a ceramic coating. The abrasive grain is subjected to a heat treatment whereby the Ti-oxides change from the trivalent into the quadrivalent degree of oxidation. The coating and the change of the degree of oxidation are effected simultaneously.

Method for improving the quality of abrasive grains

In a grinding disc reinforcement fibres of high strength are used and such fibres or normal glass fibres are covered with a protective coating including fine grain.

Grinding wheel containing grain-coated reinforcement fibers and method

Growing community of inventors

Wattens, Austria

Harald Helletsberger