直(zhi)接測數(shu)法是憑借照布鏡或(huo)織(zhi)物(wu)密度分(fen)(fen)析鏡來完(wan)成。織(zhi)物(wu)密度分(fen)(fen)析鏡的(de)刻(ke)度尺長度為5cm,在分(fen)(fen)析鏡頭下面,一塊長條(tiao)形玻璃片上刻(ke)有(you)(you)一條(tiao)紅線, 尼龍(long)纖(xian)維(wei)(wei)強(qiang)度高達700牛/(毫(hao)米·層(ceng)),耐水,抗(kang)腐蝕,耐彎曲疲(pi)勞;但彈(dan)性(xing)伸長較大。聚酯纖(xian)維(wei)(wei)性(xing)能與尼龍(long)纖(xian)維(wei)(wei)相(xiang)近(jin),而(er)使用時彈(dan)性(xing)伸長僅為尼龍(long)纖(xian)維(wei)(wei)的(de)一半,是一種(zhong)有(you)(you)發展前途...