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40目细还是80目细
更新时间: 2019-03-21 00:00:00  

1、目是指每英寸筛网上的孔眼数目,40目就是指每英寸上的孔眼是40个,80目就是80个,目数越高 ,孔眼越多。目数越大,表示颗粒越细。类似于金相组织的放大倍数。

2、目数前加正负号则表示能否漏过该目数的网孔。负数表示能漏过该目数的网孔,即颗粒尺寸小于网孔 尺寸;而正数表示不能漏过该目数的网孔,即颗粒尺寸大于网孔尺寸。

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