| 摘要 |
A scraper and scrubber includes a hollow, elongated cylindrical body having an outer surface; a plurality of parallel, circumferentially spaced, V-shaped channels having a first depth extending in the longitudinal direction on the outer surface to form a plurality of parallel, circumferentially spaced ridges extending in the longitudinal direction on the outer surface between adjacent channels; a plurality of V-shaped helical grooves having a second, smaller depth extending at an acute angle to the channels and intersecting the ridges to form pointed, substantially pyramid shaped structures on the ridges, the substantially pyramid shaped structures formed on each ridge being offset with respect to the substantially pyramid shaped structures formed on adjacent ridges.
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