| 摘要 |
<p>A sponge roller (1) for cleaning, formed from a polyvinyl acetal based porous body, provided at side surfaces thereof with a multiplicity of projections (2), top portions (3) of which being formed from surface portions having a high smoothness, the surface portions having fine openings. The sponge roller (1) for cleaning can be used to provide extremely high cleaning effects in a short time in cleaning surfaces of a hard disk, silicon wafer and the like.</p> |
