| 摘要 |
The present invention relates to extraction bedplates 10, 110, 210, 310, 410, 510, 610 for use in apparatus 5 for defiberizing paper making stock and methods for making such bedplates. Preferred methods for making such bedplates 10, 110, 210, 310, 410, 510, 610 include the step of cutting a disc shaped blank from a metal plate and the step of forming holes 45, 145, 245, 345, 445, 545, 645, 646 either the metal plate or the disc shaped blank. The holes 45, 145, 245, 345, 445, 545, 645, 646 preferably are formed using a cutting stream, most preferably either a laser or a water jet. Use of a cutting stream to form the holes facilitates the cutting of holes 45, 145, 245, 345, 445, 545, 645, 646 having non-circular, and preferably tesselatory, cross sections as well as holes 45, 145, 245, 345, 445, 545, 645, 646 extending at acute angles with respect to an axis 20 of the bedplate.
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