直(zhi)接測數法是憑借照布鏡(jing)或織(zhi)物(wu)密度(du)(du)(du)分析鏡(jing)來完(wan)成。織(zhi)物(wu)密度(du)(du)(du)分析鏡(jing)的(de)刻(ke)度(du)(du)(du)尺長度(du)(du)(du)為5cm,在(zai)分析鏡(jing)頭下面(mian),一(yi)塊長條形玻(bo)璃片上刻(ke)有一(yi)條紅線, 輸送帶用(yong)纖維(wei)織(zhi)物(wu)作帶芯,用(yong)一(yi)般橡膠作覆蓋材料(liao),表面(mian)光滑(hua)平(ping)整。棉纖維(wei)是應用(yong)最早的(de)帶芯材料(liao),易(yi)與橡膠粘合(he),濕態時強度(du)(du)(du)略有提高,但破(po)斷強度(du)(du)(du)低〔大(da)多在(zai)56牛/(毫米·層)...