Wenderoth, Lind & Ponack
Nonwoven fiber abrasive disk
 A nonwoven fiber abrasive disk is formed with a hole in the center, from flexible fibers randomly oriented in all three dimensions. The abrasive disk has compressed regions that radiate out from the center to the perimeter, with uncompressed abrasive regions located between them. The fibers in the compressed regions are densely pressed together and hardened with bonding adhesive introduced into the gaps between those fibers, such that the disk thickness in those regions is less than that in the uncompressed abrasive regions. The abrasive regions of the disk, which are thicker than the compressed regions, protrude out to form the abrasive surface. 
Seiken Co., Ltd.
B
B24D
inventional
Takayasu Masatoshi
Hamagaki Takeuchi