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1、常用篩網(wǎng)目數(shù)與孔徑對照表內(nèi)容:目數(shù),就是孔數(shù),就是每平方英寸上的孔數(shù)目。目數(shù)越大,孔徑越小。一般來說,目數(shù)×孔徑(微米數(shù))=15000。比如,400目的篩網(wǎng)的孔徑為38微米左右;500目的篩網(wǎng)的孔徑是30微米左右。由于存在開孔率的問題,也就是因為編織網(wǎng)時用的絲的粗細的不同,不同的國家的標準也不一樣,目前存在美國標準、英國標準和日本標準三種,其中英國和美國的相近,日本的差別較大。我國使用的是美國標準,也就是可用上面給出的公式計算。由此定義可以看出,目數(shù)的大小決定了篩網(wǎng)孔徑的大小。而篩網(wǎng)孔徑的大小決定了所過篩粉體的最大顆粒Dmax。所以,我們可以看出,400目的拋光粉完全有可能非常細,比如只
2、有1-2微米,也完全有可能是10微米、20微米。因為,篩網(wǎng)的孔徑是38微米左右。我們生產(chǎn)400目的拋光粉的D50就有20微米。另外,也可參考ParticleSizetoScreenMeshConversionChartParticleSizeU.S.Std.SieveTensileBoltClothMarketGradeInchesMicronsStdSieveOpeningInInchesMeshTBCOpeningMeshMGOpeningInchesMicronsInchesMicrons0.1570400050.1575???50.159040390.1320335060.131
3、9???60.131833480.1110282070.1102???70.108027430.0937238080.0929???80.096424490.07872000100.0787???100.074218850.07301854?????110.073018540.06611680120.0669140.06201575120.060315320.05551410140.0551160.05351359140.051012950.04691190160.0465180.04661184160.044511300.04101041??200.04101041???0.03941
4、000180.0394220.0380965180.03869800.0331841200.0335240.0342869200.03408640.0310784??260.0310787???0.0278707250.0280280.0282716240.02777040.0268681??300.0268681???0.0248630??320.0248630???0.0234595300.0236340.0229582???0.0213541??360.0213541300.02035160.0197500350.0197380.0198503???0.0185470??400.0
5、185470???0.0183465??420.0183465???0.0172437??440.0172437350.01764470.0165420400.0167460.0162411???0.0153388??480.0153389400.01503810.0145368??500.0145368???0.0139354450.0140520.0137348???0.0130330??540.0130330???0.0127323??580.0127323???0.0122310??600.0122310???0.0117297500.0118620.0116295???0.01
6、11282??640.0111282500.01102790.0106270??700.0106269???0.0102260??720.0102259???0.0098250600.0098740.0098249???0.0095241??760.0095241???0.0091231??780.0091231600.00922340.0088224??800.0088224???0.0083210700.0083840.0084213???0.0079200??880.0079201???0.0076193??900.0076193???0.0070177800.0071940.00
7、71180800.00701780.0065165??1050.0065165???0.00591491000.00591200.00581471000.00551400.00491251200.00491450.00471191200.00461170.00411051400.00421650.00421071500.00411040.0035881700.00352000.0034861700.0035890.002974200