一、紗線捻度是什么意思

紗線捻度是指為使紗線具有一定(ding)的(de)強力、彈性、伸長、光澤、手感等物理機(ji)械性能(neng)，必(bi)須(xu)通(tong)過加(jia)捻(nian)(nian)(nian)改變棉(mian)紗(sha)，由纖(xian)維(wei)結構(gou)來(lai)實(shi)(shi)現(xian)紗(sha)線(xian)加(jia)捻(nian)(nian)(nian)，其(qi)實(shi)(shi)就是利用棉(mian)紗(sha)橫截(jie)(jie)面間產生相(xiang)對角位(wei)移，使原(yuan)來(lai)伸直平(ping)行(xing)之纖(xian)維(wei)與(yu)紗(sha)軸發生傾(qing)斜來(lai)改變紗(sha)線(xian)結構(gou)，粗條在加(jia)捻(nian)(nian)(nian)過程由寬度逐漸(jian)收縮，兩側逐漸(jian)折(zhe)迭而卷(juan)入紗(sha)線(xian)條中(zhong)心，形(xing)成加(jia)捻(nian)(nian)(nian)三角形(xing)，在加(jia)捻(nian)(nian)(nian)三角形(xing)中(zhong)，棉(mian)條的(de)寬度和(he)截(jie)(jie)面發生變化，從扁(bian)平(ping)帶狀(zhuang)，逐漸(jian)成圓柱形(xing)的(de)紗(sha)。

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二、紗線捻度的測定方法有哪些

1、退捻法：用于短(duan)纖維純紡、混紡（環錠紡、走錠紡、翼錠紡）的股(gu)線中較(jiao)粗者和加捻的長絲。退(tui)捻至纖維平(ping)行，計數紗線單位長度(du)的退(tui)捻轉數。

2、退捻加捻法：短(duan)纖(xian)維(wei)傳統(tong)紡紗(sha)中較細(xi)的(de)(de)紗(sha)線，用退(tui)(tui)捻(nian)(nian)(nian)再反向加捻(nian)(nian)(nian)使(shi)紗(sha)線伸(shen)長后又縮回(hui)到(dao)原長，用所加轉數的(de)(de)半作此(ci)段紗(sha)線捻(nian)(nian)(nian)數。近來又發展了(le)二(er)次(ci)退(tui)(tui)捻(nian)(nian)(nian)加捻(nian)(nian)(nian)法(fa)、三次(ci)退(tui)(tui)捻(nian)(nian)(nian)加捻(nian)(nian)(nian)法(fa)及四(si)次(ci)退(tui)(tui)捻(nian)(nian)(nian)加捻(nian)(nian)(nian)法(fa)等。目的(de)(de)是消除纖(xian)維(wei)須條(tiao)反向加捻(nian)(nian)(nian)時結(jie)構的(de)(de)變化。但也(ye)可能引起(qi)紗(sha)線結(jie)構變化而使(shi)測試結(jie)果失準(zhun)。

3、反光法：用平行光(guang)束照(zhao)射(she)紗線(xian)，測量反射(she)光(guang)峰值偏轉的角度，占計(ji)加捻紗線(xian)表層螺旋角計(ji)算捻度。

對于轉杯(bei)紡(fang)(fang)、靜電窈、噴氣紡(fang)(fang)、賽洛紡(fang)(fang)、自捻(nian)紡(fang)(fang)等新型紗線(xian)的(de)捻(nian)度(du)，由于結構(gou)不(bu)同(tong)(tong)，特別(bie)紗線(xian)皮芯捻(nian)數不(bu)同(tong)(tong)甚至不(bu)同(tong)(tong)捻(nian)向。應設法分層分別(bie)測試(shi)并分別(bie)發(fa)展(zhan)不(bu)同(tong)(tong)的(de)測試(shi)方法。