| 摘要 |
Wood chips including foreign substances are made to naturally sink in a washing tank. While the floating chips are taken out from the tank, the sinking chips and the foreign substances are separated by a submerged screen so that only the small sand may fall through the screen. The sinking chips and other foreign substances are brought into a selection tube in which an upward stream is provided. By the upward stream, the wood chips are moved up for recovery and only the foreign substances sink through the stream.
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