Method of splicing endless abrasive belts and cones
AssigneeMinnesota Mining and Manufacturing Company
InventorGlenn E. Roelofs
Life of this patent
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Abstract
Splices of endless abrasive belts and cones can be formed without emission of organic volatiles by employing as the splicing adhesive an aqueous adhesive dispersion that is a blend of a polyurethane and a polyisocyanate crosslinking agent.
Claims15
Method of making an endless abrasive belt or cone and by splicing the ends of length of coated abrasive sheet material, part of which has been removed at each end to provide splicing surfaces, the splicing being done by the steps of
- a) coating onto said splicing surfaces an aqueous adhesive dispersion that is substantially free from volatile organic matter, which aqueous dispersion comprises a blend of a polyurethane and a crosslinking agent,
- b) juxtaposing the two ends, and
- c) curing the adhesive coatings.
Method of making an endless abrasive belt or cone and by splicing the ends of length of coated abrasive sheet material that has a porous backing, the splicing being done by the steps of
- a) scuffing each end of the length to provide splicing surfaces that together form a hollow when said ends are juxtaposed,
- b) coating onto said splicing surfaces an aqueous adhesive dispersion that is substantially free from volatile organic matter, which aqueous dispersion comprises a blend of 100 parts of a polyurethane and from to 20 parts by weight of a polyisocyanate crosslinking agent,
- c) juxtaposing the two ends,
- d) fitting into said hollow a splicing tape bearing an adhesive coating that is compatible with the adhesive coated on the splicing surfaces, with said adhesive coatings in face-to-face contact,
- e) applying heat and pressure to cause the adhesives of the coatings to become blended and cured, thus providing an abrasive belt or cone having a butt splice.
In a method of making an endless abrasive belt or cone by splicing the ends of a length of coated abrasive sheet material, part of which has been removed at each end to provide splicing surfaces, coating the ends with an adhesive, juxtaposing the two ends, and curing the adhesive, wherein the improvement comprises using as said adhesive an aqueous adhesive dispersion that is substantially free from volatile organic matter, which aqueous dispersion comprises a blend of a polyurethane and a crosslinking agent.
Dependencies are inferred from the claim text.