| 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 t he metal plate or the disc shaped blank. The holes (45), (145), (245), (345), (445), (545), (645), (646) preferably are formed using a cutting stream, mos t preferably either a laser or a water jet. Use of a cutting stream to form th e 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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