Patent ID: 9050707
Filing Date: 2015-06-09
Classification: B24B,B24D,B29C,C08J,Y10T

Abstract:
1. A method for manufacturing a laminated polishing pad, comprising the steps of: preparing a cell-dispersed urethane composition by a mechanical foaming method; feeding a cushion layer in a feeding direction; while feeding the cushion layer, feeding in the feeding direction a first spacer on the cushion layer so as to be at one end of a width direction of the cushion layer, feeding in the feeding direction a second spacer on the cushion layer so as to be at other end of the width direction of the cushion layer, and feeding in the feeding direction a third spacer on the cushion layer so as to be between the first and second spacers; continuously discharging said cell-dispersed urethane composition onto a part of said cushion layer where the spacers are not provided; laminating a face material on said discharged cell-dispersed urethane composition; curing the cell-dispersed urethane composition to form a polishing layer comprising a polyurethane foam, while controlling its thickness to be uniform, so that a long laminated sheet is formed; and cutting the long laminated sheet.