直接測數法是(shi)憑(ping)借(jie)照布鏡(jing)或織(zhi)(zhi)物密度(du)分(fen)析鏡(jing)來完(wan)成。織(zhi)(zhi)物密度(du)分(fen)析鏡(jing)的刻度(du)尺長度(du)為5cm,在分(fen)析鏡(jing)頭下面(mian),一塊長條(tiao)形玻(bo)璃片(pian)上刻有(you)一條(tiao)紅線, 輸送帶用(yong)纖(xian)維織(zhi)(zhi)物作(zuo)(zuo)帶芯,用(yong)一般橡膠作(zuo)(zuo)覆(fu)蓋(gai)材料,表面(mian)光(guang)滑平整。棉(mian)纖(xian)維是(shi)應用(yong)最(zui)早的帶芯材料,易與橡膠粘合,濕態時強度(du)略有(you)提高,但破斷強度(du)低〔大多在56牛/(毫米·層)...