直(zhi)接(jie)測(ce)數法是憑借照布鏡(jing)或織(zhi)物(wu)密(mi)度(du)(du)分(fen)(fen)析鏡(jing)來完成。織(zhi)物(wu)密(mi)度(du)(du)分(fen)(fen)析鏡(jing)的刻度(du)(du)尺長度(du)(du)為5cm,在分(fen)(fen)析鏡(jing)頭下面,一塊長條形玻(bo)璃片(pian)上(shang)刻有一條紅線, 輸送帶用(yong)(yong)纖(xian)維(wei)織(zhi)物(wu)作帶芯(xin),用(yong)(yong)一般橡(xiang)膠作覆蓋材料,表面光滑平整。棉纖(xian)維(wei)是應用(yong)(yong)最早的帶芯(xin)材料,易與橡(xiang)膠粘(zhan)合,濕態時強度(du)(du)略有提高(gao),但破斷強度(du)(du)低〔大多在56牛/(毫米(mi)·層)...