直接測數法是憑借照布鏡(jing)或織(zhi)(zhi)物密度(du)(du)分析(xi)鏡(jing)來(lai)完成。織(zhi)(zhi)物密度(du)(du)分析(xi)鏡(jing)的刻度(du)(du)尺(chi)長度(du)(du)為(wei)5cm,在(zai)分析(xi)鏡(jing)頭下面,YH2280印花帆布 輸送(song)帶用纖(xian)維織(zhi)(zhi)物作帶芯(xin),用一(yi)般橡膠作覆蓋材料(liao),表面光滑平整。棉纖(xian)維是應用最早(zao)的帶芯(xin)材料(liao),易與橡膠粘(zhan)合,濕態(tai)時強度(du)(du)略有提高,但破斷強度(du)(du)低〔大多在(zai)56牛/(毫(hao)米·層)左右〕,防腐...