| 摘要 |
PROBLEM TO BE SOLVED: To provide a sieve screen which is capable of upgrading a sieving speed and a sieving efficiency with the purpose of introducing the described performance and further, can be easily manufactured at a low cost. SOLUTION: This sieve screen is structured of a bottom face and a side face and is characterized in that the bottom face is irregular. In addition, the irregularity formed at the bottom face is of a corrugated shape or a pyramidal shape.
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