METHOD FOR PRODUCING LONG POLISHING PAD

摘要

Disclosed is a method for producing a long polishing pad, which is capable of preventing slurry leakage and excellent in optical detection accuracy, with high productivity. Specifically disclosed is a method for producing a long polishing pad, which comprises a step for forming a long polishing unit (9) made of a polyurethane foam, a step for forming an opening, which is composed of a through hole (12) and a shelf portion (13), in the long polishing unit (9), a step for forming a convex-shaped long light-transmitting unit (10) which is thinner than the long polishing unit (9), a step for arranging the long light-transmitting unit (10) in the opening of the long polishing unit, and a step for bonding a transparent supporting film (11) on the rear surface of the long polishing unit.