Carborundum Abrasives Company

Carborundum Abrasive Company

Dhan N Parekh

Paul R Schweyen

David E Williams

A sectional cloth backed abrasive belt comprising a series of abrasive coated cloth backed sections joined together so that the joints between sections are at an angle of from about 45.degree., to about 85.degree. to the running direction of the belt. The cloth backing has at least a portion of the fill filaments of the cloth backing at an angle of from 45.degree. to 85.degree. to the warp filaments of the cloth backing and the sections are joined such that at least 30% of the fill filaments are disposed in the running direction of the belt. The invention further comprises the process for making such an abrasive belt by joining appropriate parallelogram shaped sections. The section of abrasive belt of the invention has increased strength in the running direction of the belt and decreased stretch in the running direction of the belt.

Sectional abrasive belt

A coated abrasive product which comprises a fabric backing, a layer of abrasive grain and at least one layer of resin between the backing and abrasive grain. Hollow microspheres are present and at least partly and usually entirely embedded in the resin layer. In general, such hollow microspheres comprise hollow spherical bodies which may be of glass or plastic materials such as a phenolic resin, which have a diameter of from about 5 to about 500 microns and an average diameter of from about 25 to about 150 microns. Such hollow microspheres generally have a shell thickness which averages from about 5 to about 20 percent of the diameter of the microsphere. Such microspheres are usually incorporated into the resin layer in an amount of from about 5 to about 20 percent by weight of the resin layer. The invention further includes a process for manufacturing a coated abrasive product which comprises coating a fabric backing with a resin followed by application of abrasive grain to the resin wherein hollow microspheres are incorporated into the resin coating.

Coated abrasive product containing hollow microspheres beneath the

A flexible sheet material particularly suitable as a backing for coated abrasive products and method of making same are described. The flexible sheet material is of that type employing a straight warp fabric. The yarns of the straight warp fabric are coated and at least partially impregnated with a flexible polymeric material, such as polyvinyl alcohol, having thereover an intermediate filling coat of a phenol formaldehyde resin/latex and an outer filling coat of phenol formaldehyde resin. Alternatively, the straight warp fabric includes a penetrating base coating of flexible polymeric material and thereover a backfilling including approximately equal parts by weight of calcium carbonate and magnesium carbonate dispersed in a flexible synthetic polymeric resin which backfilling fills the interstices and encapsulates the yarns of one of the yarn arrays that form the straight warp fabric. The straight warp fabric may include a non-woven web located between adjacent arrays of warp and weft yarns. The flexible sheet material described herein may be thereafter coated in conventional manner with abrasive grains to form a coated abrasive sheet material that is particularly suitable for use in the formation of endless abrasive belts.

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Williamsville, NY, United States of America

Dhan N Parekh