Back pad for abrasive disks and preparation thereof
A back pad comprising a nonwoven fabric, and at least one carbon and polyester fiber textile layers stacked thereon has an improved flexibility and provides an improved working environment, and thus, it can be advantageously used in the manufacturing of an abrasive disk.
1. A glass fiber-free back pad for an abrasive disk comprising a nonwoven fabric and two or more sets of carbon and polyester fiber textile layers stacked on the nonwoven fabric, the carbon fiber textile being made of G78 1/0-H55 1/0×E225 1/0-G150 1/0 (warp×fill) tex/yarn and has a satin or plain fabric pattern of 48-70×26-37 (warp×fill) count/inch.
2. The back pad of claim 1 , wherein the nonwoven fabric, the carbon fiber textile layer and the polyester fiber textile layer are sequentially stacked.
3. The back pad of claim 1 , wherein the weight and thickness of the nonwoven fabric are in the ranges of 20 to 30 g/m 2 and 0.1 and 0.3 mm, respectively.
4. A method for preparing the back pad of claim 1 which comprises placing disk forms of at least one set of carbon and polyester fiber textiles on a disk form of a fabric, the carbon and polyester fiber textiles being each in a dried state after impregnation-treatment with an adhesive resin, and applying heat and pressure to the stack of nonwoven fabric and textiles.
5. The method of claim 4 , wherein the heat and pressure applied to the stack of the nonwoven fabric and textiles are in the ranges of 120 to 170° C. and 5 to 7 kgf/cm 2 , respectively.
6. The method of claim 4 , wherein the adhesive resin employed in the impregnation-treatment of the textiles is a phenol resin, or a mixture of a phenol resin and a material selected from the group consisting of acrylonitrile-butadiene-rubber, polyester resin, polyvinyl butyral, epoxy resin, urea melamine and degenerated heat-curable resin.
7. An abrasive disk which is obtained by combining a disk form of the back pad of claim 1 and a disk form of a coated abrasive body by using an adhesive.