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mesh的問題
mesh是指單位面積中有的孔數~我看到都是正數
今天有人問我什麼怎麼會有負數的~ 例如-200mesh 這到底是什麼意思阿????? mesh數越大不就代表孔目越小~ 那負數是什麼意思????? 希望知道的大大幫我解答一下喔~ 多謝了~ |
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這是什麼意思阿?請賜教了~ |
http://en.wikipedia.org/wiki/Mesh_(scale)
Particle size distribution Powders and granular materials are sometimes described as having a certain mesh size (e.g. 30 mesh sand). By itself, this type of description is somewhat ambiguous. More precise specifications will indicate that a material will pass through some specific mesh (that is, have a maximum size; larger pieces won't fit through this mesh) but will be retained by some specific tighter mesh (that is, a minimum size; pieces smaller than this will have passed through the mesh). This type of description establishes a range of particle sizes. One notation for indicating particle size distribution using mesh size is to use + and - designations. A "+" before the sieve mesh indicates the particles are retained by the sieve, while a "-" before the sieve mesh indicates the particles pass through the sieve. This means that typically 90% or more of the particles will have mesh sizes between the two values. For instance, if the particle size of a material is described as -80/+170 (or could also be written -80 +170), then 90% or more of the material will pass through an 80 mesh sieve and be retained by a 170 mesh sieve. Using the conversion chart below, the resulting particles will have a range of diameters between 0.089 and 0.178 mm (89 and 178 micrometers). :on_45::on_45::on_45::on_45: |
連重點都幫忙畫出來了
謝謝校長啊 :on_53::on_53::on_53: |
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這個是篩網篩孔的網目數, 數字越大,代表粒徑越小 2目=8000um 10目=1700um 100目=150um 300目=48um 1000目=13um 10000目=1.3um 感謝dddd大的資料提供,"-"代表通過篩網。 |
阿逗仔字 偶都看不懂:on_07:
偶還真速厲害啊:on_14::on_14: |
所有時間均為台北時間。現在的時間是 06:54 AM。 |
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