直接測數法是(shi)憑借照布鏡(jing)或織(zhi)物(wu)密度(du)(du)分析(xi)(xi)鏡(jing)來完成。織(zhi)物(wu)密度(du)(du)分析(xi)(xi)鏡(jing)的刻度(du)(du)尺長(chang)度(du)(du)為5cm,在分析(xi)(xi)鏡(jing)頭(tou)下面(mian),16安染色全棉(mian)帆布 輸送(song)帶用(yong)纖維(wei)織(zhi)物(wu)作帶芯,用(yong)一般橡(xiang)膠作覆蓋材料,表面(mian)光滑平整。棉(mian)纖維(wei)是(shi)應用(yong)最早的帶芯材料,易與橡(xiang)膠粘合,濕態時強(qiang)度(du)(du)略有提高,但破斷強(qiang)度(du)(du)低〔大多在56牛/(毫米·層)左(zuo)右〕,防(fang)(fang)腐防(fang)(fang)...