直(zhi)接測數法是(shi)憑借照布鏡或織物密度(du)(du)分析鏡來完(wan)成。織物密度(du)(du)分析鏡的刻度(du)(du)尺長(chang)(chang)度(du)(du)為5cm,在分析鏡頭下面(mian),一(yi)塊長(chang)(chang)條(tiao)形玻璃片上刻有一(yi)條(tiao)紅線(xian), 尼龍(long)纖維(wei)(wei)(wei)強度(du)(du)高達700牛(niu)/(毫米(mi)·層(ceng)),耐水,抗腐蝕(shi),耐彎曲疲勞;但彈性(xing)伸長(chang)(chang)較大。聚(ju)酯纖維(wei)(wei)(wei)性(xing)能與尼龍(long)纖維(wei)(wei)(wei)相(xiang)近,而使用時彈性(xing)伸長(chang)(chang)僅為尼龍(long)纖維(wei)(wei)(wei)的一(yi)半,是(shi)一(yi)種有發展前途(tu)...