直接測數法是憑借(jie)照布鏡或織物(wu)密(mi)度(du)(du)分(fen)析鏡來(lai)完成(cheng)。織物(wu)密(mi)度(du)(du)分(fen)析鏡的(de)刻度(du)(du)尺長度(du)(du)為5cm,在(zai)分(fen)析鏡頭下(xia)面,一(yi)塊長條(tiao)形玻璃片上刻有(you)一(yi)條(tiao)紅線, 維(wei)尼綸纖(xian)維(wei)強(qiang)度(du)(du)達200牛/(毫米·層(ceng)),彈性(xing)伸長比尼龍纖(xian)維(wei)小,易與橡膠粘合,耐熱性(xing)能好,但濕態時(shi)強(qiang)度(du)(du)要降低10~25%,僅在(zai)中(zhong)國、日本等(deng)少數國家應用。在(zai)編(bian)織帶芯時(shi)...