abstract |
A rotatable base ( 100 ) for a porous pad ( 500 ) has openings ( 126, 130, 134 ) that provide for improved flow distribution of a liquid in the base ( 100 ) across a substrate. The rotatable base ( 100 ) can be molded from a two piece mold and the openings ( 126, 130, 134 ) can have draft angles to facilitate the molding process. |