以下，對本發明之實施形態詳細地進行說明。 構成本實施形態之捲紗體之吸水性聚酯纖維於使用該纖維製作針織物並對其吸水性進行測定時，利用JIS L0217：1995 103 C法洗滌30次後之吸水性(JIS L1907：2010 滴下法)為5秒以下。洗滌30次後之吸水性較佳為3秒以下，更佳為2秒以下，進而較佳為1秒以下。利用上述方法洗滌1次後之吸水性亦較佳為5秒以下，更佳為3秒以下，進而較佳為2秒以下，特佳為1秒以下。構成本實施形態之捲紗體之聚酯纖維即便於該洗滌次數50次、100次後亦可保持吸水性，進而較佳為50次、100次後亦吸水性成為5秒以下。洗滌時之洗滌劑可較佳地使用中性洗滌劑、弱鹼性洗滌劑等通常之洗滌劑。 又，構成本實施形態之捲紗體之吸水性聚酯纖維即便於工業洗滌時，吸水效果持續之效果亦優異。所謂工業洗滌，係適用於工作服、制服等之洗滌之於較家庭洗滌嚴格之條件下的洗滌，例如可列舉JIS L1096：2010 8. 39. 5 b) 2.2.2)F-2中溫清洗法所規定之方法，通常，除洗滌劑成分以外，亦添加過氧化氫或矽酸鈉等助劑。本實施形態之織物較佳為利用JIS L1096：2010 F-2之60℃30分鐘之洗滌30次後之吸水性亦為5秒以下。 於本實施形態之捲紗體中，白粉之附著量係使用圖1所示之檢尺器(大榮科學精器製作所股份有限公司製造，型號SSD-3)進行測定。利用檢尺器，用捲取時用以施加張力之張力器摩擦紗線之表面，藉此可採取附著於纖維表面之白粉。儘管藉由上述方法無法自紗線表面採取全部所附著之白粉，但可判斷於實際使用時是否處於無問題之等級。 參照圖1進行說明，自捲紗體1抽出之紗線2依序通過導紗鉤(Snail wire)3(YUASA YARN GUIDE ENGINEERING股份有限公司製造，型號A408067-R)、環狀張力器4(股份有限公司東洋製作所製造，型號HRB6-12)、導紗嘴5(YUASA YARN GUIDE ENGINEERING股份有限公司製造，型號A408132-R)後，利用捲紗架6(捲取架周長1.0 m)進行捲取。 將供放置捲紗體1之地面直至導紗鉤3之高度設為800 mm，捲紗體1係以自導紗鉤3之導紗孔之中心導出之垂線與捲紗體1之中心軸重合的方式放置。將自導紗鉤3直至環狀張力器4之入紗孔之高度設為400 mm，自導紗鉤3進入至環狀張力器4之入紗孔之紗線2之角度係設為90度。基於環狀張力器4之負荷係使用全部六根1.2 g之鋼領。導紗嘴5之位置係設為如下位置，即水平距離環狀張力器4之出紗孔250 mm，且較環狀張力器4之出紗孔之高度低50 mm。捲紗架6之位置係將捲紗架6之旋轉軸之中心設為與導紗嘴5之導紗孔之高度同高，並將自導紗嘴5直至捲紗架6之旋轉軸之中心之距離設為533 mm。導紗嘴5之振幅為50 mm，導紗速度為120 mm/min，捲取速度為120 m/min，將約1000 m捲取於捲紗架6上。 捲取紗線時，白粉附著於導紗鉤3、環狀張力器4、導紗嘴5上，但由於難以將該等全部回收；且所附著之白粉因與紗線之摩擦而向周圍飛散，故而根據已捲取之紗線之重量變化，並藉由下述式算出紗線之白粉附著量： 白粉附著量(wt%)＝(A－B－C)/C×100 {式中，A：捲紗體之回捲前之重量(g)，B：捲紗體之回捲後之重量(g)，及C：已回捲之紗線之重量(g)}。 白粉之附著量未達0.3 wt%，較佳為未達0.2 wt%，更佳為未達0.1 wt%。若白粉之附著量超過0.3 wt%，則退繞性變差，或者白粉向編機、織機、絡筒機等之導紗器或紗道之附著變嚴重，而因白粉蓄積導致張力異常或步驟故障。 構成本實施形態之捲紗體之聚酯纖維之特徵在於：於該纖維表面存在直鏈低聚物成分，該直鏈低聚物成分其末端具有羧基(本書中，亦稱為「末端羧酸直鏈低聚物成分」)。藉由於表面存在末端羧酸直鏈低聚物成分而表現出吸水性之反覆洗滌耐久性。此處，末端羧酸直鏈低聚物成分例如可為以下之式(1)所表示者： [化2]{式中，n＝3～10}。 存在此種末端羧酸直鏈低聚物成分之聚酯纖維之捲紗體具有優異之吸水性能。 該低聚物成分可藉由利用以下所述之分析方法進行定性、定量而確認其存在。 上述末端羧酸直鏈低聚物成分中，相對低分子之低聚物成分可溶解於THF中而利用LC/MS(液相層析-質譜法)進行分析。若將其代表成分設為n＝4，則存在於纖維表面之n＝4之低聚物成分可利用以下之方法進行測定。 向20 mL容量之玻璃樣品瓶(AS ONE Labranpack 螺旋管瓶 9-852-07 NO.5)中，放入自捲紗體抽出之聚酯紗線100 mg作為試樣，添加THF 3 ml。使用Yamato Mag-mixer型號M-41，以轉數約800次/分鐘攪拌6小時後，靜置4天，進行THF溶液之LC/MS，藉此對自試樣提取出之成分進行分析。於THF溶液之取樣時，以不含有固形物成分之方式採取0.495 ml之溶液，添加苯甲酸甲酯(Methyl Benzoate)1 mg/ml溶液0.005 ml作為內部標準而製成試樣。將LC/MS分析之條件示於以下之表1中。 [表1]
圖2中表示該THF溶液之UV層析圖(240 nm)之圖例。又，圖3中表示圖2之UV層析圖之特徵峰之推定結構。於圖2中，檢測到較多上述末端羧酸直鏈低聚物成分、及下述之環狀低聚物成分之波峰。圖2中之波峰x為源自式(1)中n＝3之末端羧酸直鏈低聚物成分(分子量786.24)之波峰。其係藉由於該波峰之ESI-質譜(電灑游離，負離子質譜)中對質量數(m/z)785.17之離子([M-H]-
)進行檢測而推定。關於其他之波峰，亦同樣地，可根據藉由ESI-質譜檢測到之離子之質量數而推定形成該波峰處之成分。 於UV層析圖中，於源自上述末端羧酸直鏈低聚物成分之波峰並不明確之情形時，表示出質量數785之質譜圖(縱軸：特定質量數之檢測強度，橫軸：保持時間)，藉由於自UV光譜例推定之保持時間(圖2約4.5 min.)附近是否存在該質量數之檢測強度峰(設為波峰z)，可判斷是否存在該低聚物。 式(1)中，n＝3之末端羧酸直鏈低聚物之量可根據UV層析圖之峰面積值進行測定，且可根據與作為內部標準添加之苯甲酸甲酯(Methyl Benzoate)之UV層析圖之波峰(設為波峰c)之峰面積值的比率進行濃度換算。內部標準物質波峰c之位置係藉由於該波峰之ESI-質譜中對該質量數之離子進行檢測而推定。於UV層析圖中波峰x與其他波峰重疊等而並不明確之情形時，可使用上述質量數785之質譜圖波峰z之面積，於相同條件下測定波峰x與波峰z兩者被明確檢測到之其他樣品，而預先求出x與z之強度比，藉此可將目標試樣之波峰z之面積換算為波峰x之面積。使用以上述方式求出之目標試樣之波峰x之面積，可計算與波峰c之強度比。 本實施形態之捲紗體其式(1)中n＝4之末端羧酸直鏈低聚物之量較佳為相當於內部標準換算濃度2～15 μg/ml，更佳為相當於3～10 μg/ml。 如上所述，末端羧酸直鏈低聚物有助於吸水性，但例如以下之式(2)： [化3]{式中，n＝2～10}所表示之環狀低聚物無吸水性，反而阻礙吸水性。關於式(2)所示之環狀低聚物之量，亦可使相對低分子之環狀低聚物溶解於THF中，利用LC/MS(液相層析質量分析法)進行分析，根據相對於內部標準之波峰強度比而求出內部標準換算濃度。若將其代表成分設為n＝3，則n＝3之環狀低聚物之量較佳為相當於內部標準換算濃度80 μg/mL以下，更佳為相當於70 μg/mL以下。 具體而言，於圖2之UV層析圖(240 nm)之圖例中，波峰b為式(2)中n＝3之環狀低聚物成分之波峰。該波峰源自該環狀低聚物成分(分子量576.13)係可藉由於該波峰之ESI-質譜(電灑游離，正離子質譜)中對質量數(m/z)594.16之離子([M＋NH4]＋)進行檢測而確認。於UV層析圖中，於源自上述低聚物之波峰並不明確之情形時，係與n＝4末端羧酸直鏈低聚物同樣地，表示出質量數594.16之質譜圖，藉由於自UV光譜例推定之保持時間(圖2中約為5.3 min.)附近是否存在該質量數之檢測強度波峰(設為波峰w)，可判斷該低聚物是否存在。該低聚物成分之存在量可根據UV層析圖之峰面積值進行測定，且可根據與作為內部標準添加之苯甲酸甲酯(Methyl Benzoate)之UV層析圖之波峰(設為波峰c)之峰面積值的比率進行濃度換算。 末端羧酸直鏈低聚物成分中，相對高分子之低聚物成分難以溶解於THF中，因此無法利用上述方法進行檢測。本實施形態之捲紗體較佳為即便於提取可溶於上述THF之低聚物後，於構成捲紗體之聚酯纖維之表面亦保持有未被THF提取之相對高分子之末端羧酸直鏈低聚物。該末端羧酸直鏈低聚物與纖維之接著性較高，且即便於反覆洗滌後該低聚物亦難以脫落，因此認為對反覆洗滌後之吸水性發揮更大之效果。 本實施形態之捲紗體存在可溶及不溶於THF之式(1)中n＝3～10之末端羧酸直鏈低聚物，藉此發揮吸水效果。使該低聚物存在之方法並無特別限定，可利用將末端羧酸直鏈低聚物成分塗佈於織物上等方法進行賦予，或者使末端羧酸直鏈低聚物成分混合至酯聚合物中，但較佳為可藉由對特定之聚酯纖維實施特定之鹼處理而賦予至纖維表面附近。 本實施形態之捲紗體之特徵在於：較佳為包含含有S元素(硫元素)0.005～1 wt%之聚酯纖維。藉由對含有S元素0.005～1 wt%之聚酯纖維進行特定之鹼處理而獲得吸水效果，從而成為即便反覆進行洗滌，其效果亦基本上不會變化之紗條。若S元素之含量未達0.005 wt%，則鹼處理後之吸水性之耐久效果較小，又，於聚酯纖維中包含S元素1 wt%以上之情形時，纖維之強度降低，而紡紗變得困難。聚酯纖維中之S元素更佳為0.01～0.8 wt%，進而較佳為0.015～0.7 wt%。再者，作為定量S元素之方法，使用ICP-AES(感應耦合電漿發光分光分析裝置)。作為含有S元素0.005～1 wt%之聚酯纖維之例，例如可列舉含有酯形成性磺酸鹽化合物0.5～5莫耳%之聚酯纖維。 作為於聚酯纖維中含有0.5～5莫耳%之酯形成性磺酸鹽化合物之例，可列舉：間苯二甲酸-5-磺酸鈉、間苯二甲酸-5-磺酸鉀、2,6-萘二羧酸-4-磺酸鈉、4-羥基苯甲酸-2-磺酸鈉、3,5-二羧酸苯磺酸四甲基鏻鹽、3,5-二羧酸苯磺酸四丁基鏻鹽、3,5-二羧酸苯磺酸三丁基甲基鏻鹽、2,6-二羧基萘-4-磺酸四丁基鏻鹽、2,6-二羧基萘-4-磺酸四甲基鏻鹽、3,5-二羧酸苯磺酸銨鹽等或該等之甲酯、二甲酯等酯衍生物。該等之甲酯、二甲酯等酯衍生物就聚合物之白度、聚合速度優異之方面而言可較佳地使用。較佳為使聚酯纖維含有間苯二甲酸-5-磺酸鈉、間苯二甲酸-5-磺酸鉀等含金屬磺酸酯基之間苯二甲酸成分，其中尤佳為間苯二甲酸二甲酯-5-磺酸鈉。 又，作為含有S元素0.005～1 wt%之聚酯纖維之例，亦可列舉：含有酯非形成性磺酸鹽化合物之聚酯纖維。所謂酯非形成性磺酸鹽化合物，係磺酸鹽化合物與聚酯直接進行酯化反應，不會進行縮聚形成聚酯，而含有磺酸鹽化合物之聚酯纖維，可列舉：利用將捏合有磺酸鹽化合物0.5～5莫耳%之主片與通常之對苯二甲酸乙二酯成分為95莫耳%以上之聚酯片進行混合之方法而獲得之聚酯纖維、或於聚合時直接添加磺酸鹽化合物0.5～5莫耳%而獲得之聚酯纖維等。 作為酯非形成性磺酸鹽化合物之例，例如可列舉：烷磺酸之鹼金屬鹽或烷基苯磺酸之鹼金屬鹽。作為烷磺酸之鹼金屬鹽之例，可列舉：十二烷基磺酸鈉、十一烷基磺酸鈉、十四烷基磺酸鈉等。又，作為烷基苯磺酸之鹼金屬鹽之例，可列舉：十二烷基苯磺酸鈉、十一烷基苯磺酸鈉、十四烷基苯磺酸鈉等。就加工穩定性之觀點而言，特佳為十二烷基苯磺酸鈉。 吸水性聚酯纖維之總纖度較佳為約8～約167分德士(dtex)，更佳為約22～約110 dtex。單紗纖度無特別限定，就肌膚觸感或質地之觀點而言，較佳為約0.5～約2.5 dtex。 於吸水性聚酯纖維中亦可含有二氧化鈦等消光劑、磷酸等穩定劑、羥基二苯甲酮衍生物等紫外線吸收劑、滑石等結晶成核劑、發煙二氧化矽等增滑劑、受阻酚衍生物等抗氧化劑、阻燃劑、抗靜電劑、顏料、螢光增白劑、紅外線吸收劑、消泡劑等。 吸水性聚酯纖維較佳為假撚紗。假撚紗之捲縮較佳為捲縮伸長率為30～150%。再者，假撚紗之捲縮伸長率係於下述條件下所測得者。 固定捲縮紗之上端，於下端懸掛1.77×10-3 cN/dtex之負荷，測定30秒後之長度(A)。繼而，卸下1.77×10-3 cN/dtex之負荷，懸掛0.088cN/dtex之負荷，測定30秒後之長度(B)，藉由下述式(3)而求出捲縮伸長率： 捲縮伸長率(%)＝{(B－A)/A}×100 (3)。 本實施形態之捲紗體係藉由於吸水性聚酯纖維之捲紗體之狀態下進行鹼處理而較佳地獲得。又，鹼處理可使用筒紗染色機進行。 於利用筒紗染色機進行鹼處理之情形時，將未捲縮之紗線捲繞於筒紗染色用之管體上之情形時，存在容易發生捲取變形，又，因熱收縮而繞緊從而導致液體透過性變差，而減量率出現不均之虞，故而欠佳。 本實施形態之捲紗體可藉由如下方法進行製造，該方法包括：對含有S元素0.005～1 wt%之聚酯纖維，以相對於該聚酯纖維之減量率0.6～9%實施鹼減量之步驟。又，較佳為於上述實施鹼減量之步驟中併用螯合劑，進而於皂洗時及中和時併用低聚物分散劑。 若對聚酯纖維表面之聚合物進行鹼處理(水解)，則可使直鏈低聚物生成。雖不受特定之理論約束，但作為白粉成分之環狀低聚物並非因鹼處理(水解)而立即生成，首先，推測直鏈低聚物係因聚酯纖維表面之聚合物於纖維表面水解而(保持附於纖維表面上之狀態)生成，其次推測於直鏈低聚物自纖維表面游離後，進行脫水縮合反應，藉此會成為環狀低聚物。於纖維表面觀察到之環狀低聚物基本上為再附著者。認為環狀低聚物於溶解於高溫鹼性水溶液中時，因金屬離子之影響而螯合物化，為了防止其，而於鹼減量中併用螯合劑。即便如此，亦會附著於纖維上，由於在皂洗或水洗、中和時會注入常溫水而成為低溫，故而存在於殘留之鹼性水溶液中之環狀低聚物會析出而附著在纖維表面上。因此，藉由於皂洗時及中和時併用低聚物分散劑而使所附著之低聚物脫落。 [減量率] 為了表現出吸水性，作為鹼處理之條件，較佳為將聚酯纖維之減量率設為較佳為0.6～9%、更佳為1～8%、進而較佳為1.5～7%。減量率可根據鹼處理前後之聚酯紗線之重量而算出。於減量率未達0.6%之情形時，不會表現出基於鹼處理之吸水性，故而欠佳，若減量率大於9%，則鹼減量過度地進行，因此吸水性之耐久性變差，故而欠佳。 含有酯形成性磺酸鹽化合物0.5～5莫耳%之聚酯纖維與通常之聚酯纖維相比，鹼減量之速度較快，因此較佳為將鹼調整至低濃度而進行處理。 [鹼處理方法] 作為鹼處理之方法，可較佳地使用如下方法：利用使用筒紗染色機之方法等，將含有S元素0.005～1 wt%之聚酯纖維於紗線之狀態下以成為0.6～9%之減量率之方式實施鹼處理，將該聚酯纖維用於一部分而形成織物。 於使用筒紗染色機進行鹼處理之情形時，必須將聚酯纖維捲繞於筒紗染色用之穿孔管上。 此時，含有S元素0.005～1 wt%之聚酯纖維之捲取量較佳為0.5～4 kg，更佳為1～3.5 kg，進而較佳為2～3 kg。若捲取量未達0.5 kg，則生產性變差，故而欠佳。若捲取量超過4 kg，則於利用筒紗染色機進行鹼處理時之液體透過性變差，而減量率容易出現不均，並且捲取直徑亦變大而操作性變差。 [捲取密度] 含有S元素0.005～1 wt%之聚酯纖維之捲取密度較佳為超過0.1且未達1.2 g/cm3
，更佳為超過0.2且未達1.0 g/cm3
，進而更佳為超過0.3且未達0.8 g/cm3
，尤佳為超過0.4且未達0.6 g/cm3
。若捲取密度為0.1 g/cm3
以下，則於利用筒紗染色機進行鹼處理時捲取形態變形，而於編織時產生退繞不良。又，若捲取密度為1.2 g/cm3
以上，則鹼處理時之液體透過性變差而無法進行均勻之處理從而吸水性出現不均。 [針織解針織締捲加工(knit-de-knit)] 又，亦可列舉暫時先使用針織解針織締捲加工之方法，將含有S元素0.005～1 wt%之聚酯纖維製成針織物，實施鹼處理後，重新編織而製成捲紗體之方法，但會向該聚酯纖維賦予針織毛圈(knit loop)形狀之捲縮。此處所謂針織毛圈，係製成針織物時所形成之紗圈藉由熱處理被固定，重新編織針織物時賦予紗線之圈狀捲曲，使用該紗線製成針織物或梭織物時會成為獨特之質地，故而略微欠佳。 [絞紗處理] 亦可列舉將含有S元素0.005～1 wt%之聚酯纖維製成絞紗，使用噴射式染色機等實施鹼處理後，使用絡筒機進行回捲而製成捲紗體之方法，但於成絞步驟與回捲步驟中耗費人工而成本變高，不僅如此，由於絞紗包含鹼處理液而會因自重導致假撚紗之捲縮伸長，故而欠佳。 [鹼減量條件] 於利用筒紗染色機進行鹼處理之情形時，容易於內外層產生不均，因此較佳為低濃度下之長時間處理，為了將減量率設為0.6～9%，例如較佳為使用0.1 g/L～10 g/L之濃度之氫氧化鈉，於90℃～100℃下處理40分鐘～100分鐘，進而較佳為使用5 g/L～10 g/L之濃度之氫氧化鈉，於90～95℃下處理50分鐘～80分鐘。 通常，於鹼處理後利用酸進行中和並進行水洗，但於利用筒紗染色機進行鹼處理之情形時，容易產生如下問題：所析出之環狀低聚物附著於筒紗內部，使用捲紗體進行織造時退繞性變差；或以白粉形式附著於編機或織機之紗道或導紗器上。為了解決上述問題，必須不使成為白粉之原因之低聚物析出；不使低聚物附著於聚酯纖維表面；強化鹼處理後之洗淨而儘量地去除所附著之環狀低聚物。 如上所述，藉由鹼減量而於使聚酯纖維水解時產生成為白粉之原因之環狀低聚物。環狀低聚物容易受鹼處理時之水溶液中之金屬離子之影響而進行螯合物化，由此變得更容易附著於纖維表面，因此較佳為添加螯合劑。作為螯合劑，並未特定，作為螯合劑，例如可列舉：多羧酸、氮基三乙酸(NTA)、乙二胺四乙酸(EDTA)、次氮基三亞甲基膦酸、羥基亞乙基二膦酸(NTMP)、膦酸、麩胺酸二乙酸、該等之鹽等。螯合劑較佳為向鹼處理時之水溶液中添加0.5～2.0 g/L。 鹼性水溶液中之環狀低聚物於液溫為高溫之情形時溶解，但於液溫低於90℃之情形時析出。根據此種情況，可藉由於鹼處理後於90～95℃之高溫下進行排液而抑制環狀低聚物之析出及附著。 [皂洗] 於排液後之捲紗體上殘留有鹼溶液，因此必須進行洗淨。較佳為排液後向筒紗染色機進行注水，添加亞硫酸氫鈉0.5～2.0 g/L、低聚物分散劑，於80℃下進行10分鐘洗淨後，利用40～60℃之溫水進行10分鐘之熱水洗2次以上後，於常溫下進行水洗。 作為所使用之低聚物分散劑，並無特別限定，可將胺系非離子化合物、脂肪酸之環氧烷加成物、多環系非離子化合物、磺酸烷基酯、多元醇脂肪酸酯、多元醇脂肪酸之環氧烷加成物、芳香族系聚酯樹脂、羧酸鹽、聚胺基羧酸鹽等成分單獨使用或併用。於鹼性及酸性之任一種時，為了防止低聚物之附著，並將所附著之低聚物去除，均可較佳地使用兩性界面活性劑。低聚物分散劑於皂洗時較佳為添加0.5～3.0 g/L。若未達0.5 g/L，則低聚物之附著防止效果、低聚物之去除效果變差，而無法減少白粉附著量。又，若低聚物分散劑之添加量超過3.0 g/L，則可減少白粉附著量，但亦會將有助於吸水性之直鏈低聚物自纖維表面去除，因此吸水性變差。 [中和] 關於中和所使用之酸，可較佳地使用草酸或乙酸。此時，亦可藉由併用低聚物分散劑，而於呈酸性時抑制低聚物之析出及附著。 作為中和時所使用之低聚物分散劑，並無特別限定，於鹼性及酸性之任一種時，為了防止低聚物之附著，均可較佳地使用兩性界面活性劑。 [筒紗染色] 亦可對本實施形態之捲紗體實施染色。於用作色紗之情形時，亦可於利用筒紗染色機進行鹼處理後，直接進行筒紗染色。 [整理劑] 對於本實施形態之捲紗體，亦可進行用以使質地變柔軟之柔軟劑處理或為了提高紗線之退繞性、針織之織成性而於浴中進行潤滑處理，但使用陽離子性柔軟劑或矽油等阻礙吸水性者之情況欠佳。 [回捲] 又，本實施形態之捲紗體亦可於利用筒紗染色機實施鹼處理後，使用絡筒機進行回捲而製成捲紗體。 [實施例] 以下，藉由實施例對本發明具體地進行說明。當然，本發明並不限定於該等。 再者，實施例中所獲得之捲紗體係利用以下之方法進行評估。 (1)白粉附著量 使用上述之方法。 (2)n＝4之末端羧酸直鏈低聚物之定量(可溶於THF之成分) 使用上述之方法。 (3)吸水性 自捲紗體抽出紗線而製作筒狀針織物，將所得之筒狀針織物以常法進行精煉、乾燥後，使用利用JIS L0217：1995 103 C法洗滌30次後之JIS L1907：2010 滴下法而測定所得之筒狀針織物之吸水性。於本說明書中，將所得之吸水性設為「吸收性聚酯纖維之」吸水性。 (4)洗滌處理 自捲紗體抽出紗線而製作筒狀針織物，將所得之筒狀針織物以常法進行精煉、乾燥後，藉由JIS L0217：1995 附表1之103 C法，並使用弱鹼性洗滌劑(商品名 花王(股) ATTACK)作為洗滌劑，對所得之筒狀針織物進行洗滌處理。 (5)工業洗滌處理 自捲紗體抽出紗線而製作筒狀針織物，將所得之筒狀針織物以常法進行精煉、乾燥後，假定工業洗滌試驗，並於JIS L1096：2010 8. 39. 5 b) 2.2.2)F-2中溫清洗法之條件下，使用肥皂0.8%owf、過氧化氫0.8%owf、矽酸鈉0.8%owf作為洗淨劑而進行洗滌處理。 (6)針織毛圈之有無 自捲紗體抽出紗線，於不懸掛負荷之狀態下觀察紗線之形態。此時確認是否存在源自針織物之圈狀捲曲。 [實施例1] 將含有間苯二甲酸二甲酯-5-磺酸鈉2莫耳%之84 dtex/36f圓形剖面之聚酯假撚紗(S元素含有率0.14 wt%)以捲取密度0.5 g/cm3
、捲取量3.0 kg捲繞於筒紗染色用穿孔管上。 將捲繞有紗線之管安裝於筒紗染色機中，將使用有氫氧化鈉10 g/L、作為螯合劑之MARPON A-47(松本油脂製藥(股)製造，多羧酸調配品)2 g/L之鹼性水溶液於2℃/min之條件下進行升溫，於液溫95℃下實施鹼處理60分鐘。 鹼處理後，於液溫95℃下直接排水後，進行注水，使用亞硫酸氫鈉1 g/L、作為低聚物分散劑之MARPON PS-K7(松本油脂製藥(股)製造，兩性界面活性劑調配品)2 g/L，於液溫80℃下進行15分鐘皂洗後，進行排水，於液溫60℃下進行3分鐘之熱水洗兩次。 熱水洗後，進行排水，再次供水後，使用1 g/L之MARPON PS-K7作為低聚物分散劑，之後使用乙酸進行中和，進行水洗。 排水後，自筒紗染色機中取出捲繞有紗線之管，利用離心脫水機進行脫水後，利用筒紗乾燥機進行乾燥，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性未達1秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為2秒。白粉之附著量為0.10 wt%。 [實施例2] 於鹼處理時使用1 g/L 之MARPON A-47作為螯合劑，於皂洗時使用1 g/L之MARPON PS-K7作為低聚物分散劑，於中和時使用0.5 g/L之MARPON PS-K7作為低聚物分散劑，除此以外，藉由與實施例1相同之方法進行處理，而獲得捲紗體。所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性未達1秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為2秒。白粉之附著量為0.23 wt%。 [實施例3] 於中和時使用2 g/L之MARPON PS-K7作為低聚物分散劑，除此以外，藉由與實施例1相同之方法進行處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性為4秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為15秒。白粉之附著量為0.05 wt%。 [比較例1] 將含有間苯二甲酸二甲酯-5-磺酸鈉2莫耳%之84 dtex/36f圓形剖面之聚酯假撚紗(S元素含有率0.14 wt%)以捲取密度0.5 g/cm3
、捲取量3.0 kg捲繞於筒紗染色用穿孔管上。 鹼處理係使用筒紗染色機，將使用有氫氧化鈉10 g/L之鹼性水溶液於2℃/min之條件下進行升溫，於液溫95℃下實施鹼處理60分鐘。 鹼處理後，於95℃下直接排水後，進行注水，於液溫80℃下進行15分鐘皂洗後進行排水，於液溫60℃下進行3分鐘之熱水洗兩次。 熱水洗後，進行排水，再次供水後，使用乙酸進行中和，進行水洗。 排水後，自筒紗染色機中取出，利用離心脫水機進行脫水後，利用筒紗乾燥機進行乾燥，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性為15秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為15秒。白粉之附著量為0.73 wt%。 [比較例2] 於皂洗時使用2 g/L之MARPON A-47作為低聚物分散劑，除此以外，實施與比較例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性未達1秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為2秒。白粉之附著量為0.64 wt%。 [比較例3] 於皂洗時使用2 g/L之MARPON A-47作為低聚物分散劑，於中和時使用1 g/L之MARPON PS-K7作為低聚物分散劑，除此以外，實施與比較例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性未達1秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為2秒。白粉之附著量為0.52 wt%。 [比較例4] 於鹼處理時使用2 g/L之MARPON A-47作為低聚物分散劑，除此以外，實施與比較例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性未達1秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為2秒。白粉之附著量為0.47 wt%。 [比較例5] 將鹼減量後之排液溫度設為70℃，除此以外，實施與實施例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性為6秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為13秒。白粉之附著量為0.82 wt%。 [比較例6] 於中和時使用6 g/L之MARPON PS-K7作為低聚物分散劑，除此以外，實施與實施例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性為7秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為15秒。白粉之附著量為0.03 wt%。 [比較例7] 於皂洗時使用6 g/L之MARPON PS-K7作為低聚物分散劑，除此以外，實施與實施例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維之減量率為6.0%，利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性為8秒，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為15秒。白粉之附著量為0.03 wt%。 [比較例8] 使用不含有磺酸之普通聚酯之84 dtex/36f圓形剖面聚酯假撚紗，除此以外，實施與實施例1相同之處理，而獲得捲紗體。 所獲得之捲紗體之吸水性聚酯纖維其利用JIS L0217：1995 附表1之103 C法洗滌30次後之吸水性為180秒以上，利用JIS L1096：2010 F-2中溫清洗法洗滌30次後之吸水性為180秒以上。白粉之附著量為0.02 wt%。 將上述實施例1～3及比較例1～8中所獲得之聚酯捲紗體之製造條件、物性值等一併示於以下之表2。 [表2]
[產業上之可利用性] 本發明之吸水性聚酯纖維之捲紗體於捲紗之回捲步驟或編織步驟中不產生白粉，即便於不實施吸水加工之情形時亦可半永久性地吸水而迅速地吸收穿著時之汗液，舒適性優異，且柔軟而肌膚觸感良好，因此可較佳地用於內衣、便服等。Hereinafter, embodiments of the present invention will be described in detail. Water-absorbent polyester fiber constituting the corrugated body of the present embodiment, when the knitted fabric is produced using the fiber and the water absorbability is measured, the water absorption after washing 30 times by the JIS L0217:1995 103 C method (JIS L1907:2010) The dropping method is 5 seconds or less. The water absorbency after washing 30 times is preferably 3 seconds or shorter, more preferably 2 seconds or shorter, and still more preferably 1 second or shorter. The water absorbency after washing once by the above method is also preferably 5 seconds or shorter, more preferably 3 seconds or shorter, further preferably 2 seconds or shorter, and particularly preferably 1 second or shorter. The polyester fiber constituting the corrugated body of the present embodiment can maintain water absorption even after 50 times and 100 times of washing, and further preferably has water absorption of 5 seconds or less after 50 times and 100 times. As the detergent at the time of washing, a usual detergent such as a neutral detergent or a weakly alkaline detergent can be preferably used. Moreover, the water absorbing polyester fiber constituting the corrugated body of the present embodiment is excellent in the effect of continuing the water absorbing effect even in industrial washing. The so-called industrial washing is suitable for the washing of work clothes, uniforms, etc. under the stricter conditions of household washing, for example, JIS L1096:2010 8. 39. 5 b) 2.2.2) F-2 medium temperature cleaning method In the method specified, in general, in addition to the detergent component, an auxiliary agent such as hydrogen peroxide or sodium citrate is added. The fabric of the present embodiment preferably has a water absorbency of 5 seconds or less after washing 30 times at 60 ° C for 30 minutes in JIS L1096:2010 F-2. In the corrugated body of the present embodiment, the adhesion amount of the white powder was measured using a ruler (manufactured by Daiei Scientific Seiki Co., Ltd., model SSD-3) shown in Fig. 1 . With the ruler, the surface of the yarn is rubbed with a tensioner for applying tension during winding, whereby white powder adhering to the surface of the fiber can be taken. Although it is impossible to take all the adhered white powder from the surface of the yarn by the above method, it can be judged whether it is at a level of no problem in actual use. Referring to Fig. 1, the yarn 2 drawn from the bobbin 1 is sequentially passed through a Snail wire 3 (manufactured by YUASA YARN GUIDE ENGINEERING Co., Ltd., model A408067-R), and a ring tensioner 4 (shares). Co., Ltd. manufactured by Toyo Seisakusho Co., Ltd., model HRB6-12), yarn guide 5 (manufactured by YUASA YARN GUIDE ENGINEERING Co., Ltd., model A408132-R), and coiled by creel 6 (winding frame circumference 1.0 m) . The floor on which the corrugated body 1 is placed until the height of the yarn guide hook 3 is set to 800 mm, and the bobbin body 1 is perpendicular to the center axis of the bobbin body 1 which is led out from the center of the yarn guide hole of the self-guide yarn hook 3. The way to place. The height of the yarn guide hole 3 from the yarn guide hook 3 to the ring tensioner 4 is set to 400 mm, and the angle of the yarn 2 from the yarn guide hook 3 to the yarn insertion hole of the ring tensioner 4 is set to 90 degrees. . The load based on the ring tensioner 4 uses all six 1.2 g steel collars. The position of the yarn guiding nozzle 5 is set to a position that is 250 mm horizontally from the exit hole of the ring tensioner 4 and 50 mm lower than the height of the yarn exit hole of the ring tensioner 4. The position of the creel 6 is such that the center of the rotating shaft of the creel 6 is set to be the same height as the height of the yarn guiding hole of the yarn guiding nozzle 5, and the center of the rotating yarn feeder 5 is rotated to the center of the rotating shaft of the creel 6. The distance is set to 533 mm. The yarn feeder 5 has an amplitude of 50 mm, a yarn guiding speed of 120 mm/min, a take-up speed of 120 m/min, and a winding of about 1000 m on the bobbin 6. When the yarn is taken up, the white powder adheres to the yarn guide hook 3, the ring tensioner 4, and the yarn guide nozzle 5, but it is difficult to recover all of the yarn; and the adhered white powder is scattered around due to friction with the yarn. Therefore, according to the weight change of the wound yarn, the white powder adhesion amount of the yarn is calculated by the following formula: White powder adhesion amount (wt%) = (A-B-C) / C × 100 {wherein, A: weight before rewinding of the bobbin body (g), B: weight after rewinding of the bobbin body (g), and C: weight of the rewinded yarn (g)}. The amount of white powder adhered is less than 0.3 wt%, preferably less than 0.2 wt%, more preferably less than 0.1 wt%. If the adhesion amount of the white powder exceeds 0.3 wt%, the unwinding property is deteriorated, or the adhesion of the white powder to the yarn guide or the yarn guide of the knitting machine, the loom, the winder or the like becomes severe, and the tension abnormality or the step due to the accumulation of the white powder malfunction. The polyester fiber constituting the corrugated body of the present embodiment is characterized in that a linear oligomer component is present on the surface of the fiber, and the linear oligomer component has a carboxyl group at its end (this book is also referred to as "terminal carboxylic acid" Linear oligomer component"). The repeated washing durability is exhibited by the presence of a terminal carboxylic acid linear oligomer component on the surface. Here, the terminal carboxylic acid linear oligomer component may be, for example, represented by the following formula (1): [Chemical 2] {where, n=3~10}. The web of the polyester fiber in which the terminal carboxylic acid linear oligomer component is present has excellent water absorption properties. The oligomer component can be confirmed by qualitative and quantitative determination by the analysis method described below. Among the above-mentioned terminal carboxylic acid linear oligomer components, the relatively low molecular oligomer component can be dissolved in THF and analyzed by LC/MS (liquid chromatography-mass spectrometry). When the representative component is n=4, the oligomer component of n=4 present on the surface of the fiber can be measured by the following method. To a 20 mL-capacity glass vial (AS ONE Labranpack spiral vial 9-852-07 NO. 5), 100 mg of the polyester yarn drawn from the bobbin body was placed as a sample, and 3 ml of THF was added. After stirring for 6 hours at a number of revolutions of about 800 times/min using a Yamato Mag-mixer model M-41, the mixture was allowed to stand for 4 days, and LC/MS of a THF solution was carried out to analyze the components extracted from the sample. When sampling the THF solution, 0.495 ml of a solution containing no solid content was added, and 0.005 ml of a 1 mg/ml solution of methyl benzoate (Methyl Benzoate) was added as an internal standard to prepare a sample. The conditions of the LC/MS analysis are shown in Table 1 below. [Table 1] A legend of the UV chromatogram (240 nm) of the THF solution is shown in FIG. Further, Fig. 3 shows the estimated structure of the characteristic peak of the UV chromatogram of Fig. 2. In Fig. 2, a peak of the above-mentioned terminal carboxylic acid linear oligomer component and the following cyclic oligomer component were detected. The peak x in Fig. 2 is a peak derived from the linear oligomer component (molecular weight 786.24) of the terminal carboxylic acid of n = 3 in the formula (1). This was estimated by detecting the mass (m/z) of 785.17 ions ([MH] - ) in the ESI-mass spectrometry (electrospray free, negative ion mass spectrometry) of the peak. Similarly, for other peaks, the composition of the peak can be estimated based on the mass of the ions detected by ESI-mass spectrometry. In the UV chromatogram, when the peak derived from the linear carboxylic acid linear oligomer component is not clear, the mass spectrum of mass 785 is shown (vertical axis: detection intensity of a specific mass number, horizontal axis) : Hold time), whether or not the oligomer is present by the presence or absence of the detection intensity peak (set as the peak z) of the mass number in the vicinity of the hold time (about 4.5 min.) of the UV spectrum example. In the formula (1), the amount of the terminal carboxylic acid linear oligomer having n = 3 can be measured according to the peak area value of the UV chromatogram, and can be added according to the methyl ethyl benzoate (Methyl Benzoate) added as an internal standard. The ratio of the peak area values of the peaks of the UV chromatogram (set to crest c) is converted into a concentration. The position of the internal standard material peak c is estimated by detecting the mass of the ions in the ESI-mass spectrum of the peak. In the case where the peak x overlaps with other peaks in the UV chromatogram and is not clear, the area of the mass spectrum peak z of the above mass number 785 can be used, and both the peak x and the peak z are clearly detected under the same conditions. The other samples are taken, and the intensity ratio of x and z is obtained in advance, whereby the area of the peak z of the target sample can be converted into the area of the peak x. The intensity ratio to the peak c can be calculated using the area of the peak x of the target sample obtained in the above manner. In the corrugated body of the present embodiment, the amount of the terminal carboxylic acid linear oligomer having n = 4 in the formula (1) is preferably an internal standard conversion concentration of 2 to 15 μg/ml, more preferably 3 to 3 10 μg/ml. As described above, the terminal carboxylic acid linear oligomer contributes to water absorption, but for example, the following formula (2): [Chemical 3] In the formula, the cyclic oligomer represented by n = 2 to 10} has no water absorption property, and adversely inhibits water absorption. With respect to the amount of the cyclic oligomer represented by the formula (2), a relatively low molecular cyclic oligomer can also be dissolved in THF and analyzed by LC/MS (liquid chromatography mass spectrometry) according to The internal standard conversion concentration is obtained with respect to the peak intensity ratio of the internal standard. When the representative component is n=3, the amount of the cyclic oligomer having n=3 is preferably equivalent to an internal standard conversion concentration of 80 μg/mL or less, and more preferably 70 μg/mL or less. Specifically, in the legend of the UV chromatogram (240 nm) of Fig. 2, the peak b is the peak of the cyclic oligomer component of n = 3 in the formula (2). The peak derived from the cyclic oligomer component (molecular weight 576.13) can be obtained by the ESI-mass spectrometry (electrospray free, positive ion mass spectrometry) of the peak for the mass (m/z) 594.16 ion ([M+NH4] +) Confirm with the test. In the UV chromatogram, when the peak derived from the above oligomer is not clear, the mass spectrum of the mass number 594.16 is represented by the same as the n=4 terminal carboxylic acid linear oligomer. Whether or not the detected intensity peak (the peak w) of the mass is present in the vicinity of the hold time (about 5.3 min. in Fig. 2) estimated from the UV spectrum example can be judged whether or not the oligomer exists. The amount of the oligomer component can be determined according to the peak area value of the UV chromatogram, and can be based on the peak of the UV chromatogram of Methyl Benzoate added as an internal standard (set to crest c The ratio of the peak area values is converted into a concentration. In the terminal carboxylic acid linear oligomer component, the oligomer component of the polymer is less likely to be dissolved in THF, and thus cannot be detected by the above method. Preferably, the corrugated body of the present embodiment retains a terminal carboxylic acid of a relatively high polymer which is not extracted by THF on the surface of the polyester fiber constituting the bobbin body even after the oligomer which is soluble in the THF is extracted. Linear oligomers. The terminal carboxylic acid linear oligomer has high adhesion to the fiber, and the oligomer is hard to fall off even after repeated washing, and therefore it is considered that the water absorbing property after the repeated washing is more exerted. The bobbin body of the present embodiment has a terminal carboxylic acid linear oligomer having n = 3 to 10 in the formula (1) which is soluble and insoluble in THF, thereby exhibiting a water absorbing effect. The method for allowing the oligomer to be present is not particularly limited, and it may be carried out by applying a terminal carboxylic acid linear oligomer component to a woven fabric or the like, or by mixing a terminal carboxylic acid linear oligomer component to an ester polymerization. Preferably, it is imparted to the vicinity of the surface of the fiber by subjecting the particular polyester fiber to a particular alkali treatment. The corrugated body of the present embodiment is characterized in that it preferably contains a polyester fiber containing 0.005 to 1 wt% of an element S (sulfur element). By subjecting the polyester fiber containing 0.005 to 1 wt% of the S element to a specific alkali treatment to obtain a water absorbing effect, it is a yarn which does not substantially change its effect even if it is washed repeatedly. If the content of the S element is less than 0.005 wt%, the durability of the water absorption after the alkali treatment is small, and when the polyester fiber contains 1 wt% or more of the S element, the strength of the fiber is lowered, and the spinning is performed. It has become difficult. The S element in the polyester fiber is more preferably 0.01 to 0.8% by weight, still more preferably 0.015 to 0.7% by weight. Further, as a method of quantifying the S element, ICP-AES (inductively coupled plasma luminescence spectroscopic analyzer) is used. Examples of the polyester fiber containing 0.005 to 1% by weight of the S element include, for example, a polyester fiber containing 0.5 to 5 mol% of the ester-forming sulfonate compound. Examples of the ester-forming sulfonate compound containing 0.5 to 5 mol% of the polyester fiber include sodium isophthalate-5-sulfonate, potassium isophthalate-5-sulfonate, and 2 , 6-naphthalenedicarboxylic acid-4-sulfonate sodium, 4-hydroxybenzoic acid-2-sulfonic acid sodium, 3,5-dicarboxylic acid benzenesulfonic acid tetramethyl phosphonium salt, 3,5-dicarboxylic acid benzene Tetrabutylphosphonium sulfonate, tributylmethyl phosphonium 3,5-dicarboxybenzenesulfonate, tetrabutylphosphonium 2,6-dicarboxynaphthalene-4-sulfonate, 2,6-dicarboxynaphthalene- 4-sulfonic acid tetramethyl phosphonium salt, 3,5-dicarboxylic acid benzenesulfonic acid ammonium salt, or the like, or an ester derivative such as a methyl ester or a dimethyl ester. These ester derivatives such as a methyl ester or a dimethyl ester can be preferably used in terms of the whiteness of the polymer and the polymerization rate. Preferably, the polyester fiber contains a metal sulfonate-containing phthalic acid component such as sodium isophthalate-5-sulfonate or potassium isophthalate-5-sulfonate, and particularly preferably is isophthalic acid. Sodium formate carboxylic acid-5-sulfonate. Further, examples of the polyester fiber containing 0.005 to 1% by weight of the S element include polyester fibers containing an ester non-forming sulfonate compound. The ester non-forming sulfonate compound is a direct acylation reaction between a sulfonate compound and a polyester, and does not undergo polycondensation to form a polyester, and a polyester fiber containing a sulfonate compound can be exemplified by a polyester fiber obtained by mixing a main sheet of 0.5 to 5 mol% of a sulfonate compound with a polyester sheet having a usual ethylene terephthalate component of 95 mol% or more, or directly during polymerization A polyester fiber obtained by adding 0.5 to 5 mol% of a sulfonate compound. Examples of the ester non-formable sulfonate compound include an alkali metal salt of an alkanesulfonic acid or an alkali metal salt of an alkylbenzenesulfonic acid. Examples of the alkali metal salt of the alkanesulfonic acid include sodium dodecylsulfonate, sodium undecylsulfonate, and sodium tetradecylsulfonate. Further, examples of the alkali metal salt of alkylbenzenesulfonic acid include sodium dodecylbenzenesulfonate, sodium undecylbenzenesulfonate, and sodium tetradecylbenzenesulfonate. From the viewpoint of processing stability, sodium dodecylbenzenesulfonate is particularly preferred. The total fineness of the water-absorbing polyester fiber is preferably from about 8 to about 167 dtex, more preferably from about 22 to about 110 dtex. The single yarn fineness is not particularly limited, and is preferably from about 0.5 to about 2.5 dtex from the viewpoint of skin feel or texture. The water-absorbing polyester fiber may contain a matting agent such as titanium dioxide, a stabilizer such as phosphoric acid, a UV absorber such as a hydroxybenzophenone derivative, a crystal nucleating agent such as talc, a slip agent such as fumed cerium oxide, or the like. An antioxidant such as a phenol derivative, a flame retardant, an antistatic agent, a pigment, a fluorescent whitening agent, an infrared absorbing agent, an antifoaming agent, and the like. The water absorbent polyester fiber is preferably a false twisted yarn. The crimp of the false twist yarn is preferably a crimp elongation of 30 to 150%. Further, the crimp elongation of the false twist yarn was measured under the following conditions. The upper end of the crimped yarn was fixed, and the load of 1.77×10-3 cN/dtex was suspended at the lower end, and the length (A) after 30 seconds was measured. Then, the load of 1.77×10-3 cN/dtex was removed, the load of 0.088 cN/dtex was suspended, and the length (B) after 30 seconds was measured, and the crimp elongation was determined by the following formula (3): Elongation (%) = {(B - A) / A} × 100 (3). The yarn winding system of the present embodiment is preferably obtained by subjecting the yarn-wound body of the water-absorbing polyester fiber to alkali treatment. Further, the alkali treatment can be carried out using a yarn dyeing machine. In the case where the yarn is dyed by the yarn dyeing machine, when the unwound yarn is wound around the tube for dyeing the yarn, the winding deformation is liable to occur, and the yarn is tightly contracted due to heat shrinkage. As a result, the liquid permeability is deteriorated, and the rate of reduction is uneven, which is not preferable. The corrugated body of the present embodiment can be produced by a method comprising: performing a reduction of alkali with respect to a polyester fiber containing 0.005 to 1 wt% of the S element at a reduction ratio of 0.6 to 9% with respect to the polyester fiber. The steps. Further, it is preferred to use a chelating agent in the step of performing the alkali reduction described above, and further to use an oligomer dispersing agent during soaping and neutralization. When the polymer on the surface of the polyester fiber is subjected to alkali treatment (hydrolysis), a linear oligomer can be produced. Although not bound by a specific theory, the cyclic oligomer as a white powder component is not immediately formed by alkali treatment (hydrolysis). First, it is presumed that the linear oligomer is hydrolyzed on the surface of the fiber by the polymer on the surface of the polyester fiber. On the other hand, it is presumed that the linear oligomer is free from the surface of the fiber, and then dehydrates and condenses, thereby forming a cyclic oligomer. The cyclic oligomer observed on the surface of the fiber is essentially a reattach. When the cyclic oligomer is dissolved in a high-temperature alkaline aqueous solution, it is considered to be chelated by the influence of metal ions, and in order to prevent this, a chelating agent is used in combination with the alkali reduction. Even in this case, it adheres to the fiber, and since it is poured into normal temperature water during soaping, washing, and neutralization, it becomes a low temperature, so that the cyclic oligomer existing in the residual alkaline aqueous solution precipitates and adheres to the fiber surface. on. Therefore, the attached oligomer is detached by the use of the oligomer dispersant during soaping and neutralization. [Reduction rate] In order to exhibit water absorption, as a condition for alkali treatment, the reduction ratio of the polyester fiber is preferably 0.6 to 9%, more preferably 1 to 8%, still more preferably 1.5 to 5%. 7%. The reduction rate can be calculated from the weight of the polyester yarn before and after the alkali treatment. When the reduction rate is less than 0.6%, the water absorption by the alkali treatment is not exhibited, so that it is not preferable. If the reduction ratio is more than 9%, the alkali reduction is excessively performed, so that the durability of water absorption is deteriorated. Poor. The polyester fiber containing 0.5 to 5 mol% of the ester-forming sulfonate compound has a faster alkali reduction rate than the usual polyester fiber. Therefore, it is preferred to adjust the alkali to a low concentration for treatment. [Alkaline treatment method] As a method of alkali treatment, a method in which a polyester fiber containing 0.005 to 1 wt% of S element is used in a yarn state by a method using a yarn dyeing machine or the like is preferably used. The alkali treatment was carried out in a manner of a reduction ratio of 0.6 to 9%, and the polyester fiber was used for a part to form a woven fabric. In the case of alkali treatment using a yarn dyeing machine, it is necessary to wind the polyester fiber around the perforated tube for dyeing the yarn. At this time, the winding amount of the polyester fiber containing 0.005 to 1 wt% of the S element is preferably 0.5 to 4 kg, more preferably 1 to 3.5 kg, still more preferably 2 to 3 kg. If the coiling amount is less than 0.5 kg, the productivity is deteriorated, which is not preferable. When the coiling amount is more than 4 kg, the liquid permeability at the time of alkali treatment by the yarn dyeing machine is deteriorated, and the reduction rate is likely to be uneven, and the winding diameter is also increased to deteriorate the workability. [Winding Density] The winding density of the polyester fiber containing 0.005 to 1 wt% of the S element is preferably more than 0.1 and less than 1.2 g/cm 3 , more preferably more than 0.2 and less than 1.0 g/cm 3 , and further More preferably, it is more than 0.3 and less than 0.8 g/cm 3 , particularly preferably more than 0.4 and less than 0.6 g/cm 3 . When the winding density is 0.1 g/cm 3 or less, the winding form is deformed when the alkali treatment is performed by the yarn dyeing machine, and the unwinding defect occurs during knitting. In addition, when the coiling density is 1.2 g/cm 3 or more, the liquid permeability at the time of alkali treatment is deteriorated, and uniform treatment cannot be performed, and water absorption is uneven. [Knit-de-knit] The knit-de-knit method may be used, and the polyester fiber containing 0.005 to 1 wt% of the S element may be knitted into a knitted fabric. After the alkali treatment, the method of re-weaving to form a corrugated body is applied, but the knit loop shape is crimped to the polyester fiber. Here, the knitted loops are formed by kneading the loops formed by the heat treatment, and the loops are imparted to the yarn when the knitted fabric is re-knitted. When the yarn is used to make a knitted fabric or a woven fabric, It is a unique texture, so it is slightly less good. [Skein treatment] A polyester fiber containing 0.005 to 1 wt% of the S element may be skeined, and subjected to alkali treatment using a jet dyeing machine or the like, and then rewinded by a winder to form a corrugated body. However, the method is laborious and costly in the twisting step and the rewinding step. Moreover, since the skein contains the alkali treatment liquid, the false twist yarn is stretched and elongated due to its own weight, which is not preferable. [Alkal reduction condition] When the alkali treatment is performed by the yarn dyeing machine, it is easy to cause unevenness in the inner and outer layers. Therefore, it is preferable to treat it at a low concentration for a long time, and to set the reduction rate to 0.6 to 9%, for example. Preferably, the sodium hydroxide is used in a concentration of 0.1 g/L to 10 g/L, and is treated at 90 ° C to 100 ° C for 40 minutes to 100 minutes, and more preferably at a concentration of 5 g / L to 10 g / L. The sodium hydroxide is treated at 90 to 95 ° C for 50 minutes to 80 minutes. Usually, it is neutralized with an acid after alkali treatment and washed with water. However, in the case of alkali treatment by a yarn dyeing machine, there is a problem that the precipitated cyclic oligomer adheres to the inside of the yarn, and the roll is used. When the yarn body is woven, the unwinding property is deteriorated; or it is attached to the yarn path or the yarn guide of the knitting machine or the weaving machine in the form of white powder. In order to solve the above problem, it is necessary to prevent the oligomer which is a cause of white powder from being precipitated; the oligomer is not attached to the surface of the polyester fiber; and the alkali-treated after the alkali treatment is washed to remove the attached cyclic oligomer as much as possible. As described above, a cyclic oligomer which is a cause of white powder is generated when the polyester fiber is hydrolyzed by alkali reduction. The cyclic oligomer is easily chelated by the influence of metal ions in the aqueous solution at the time of alkali treatment, and thus becomes more likely to adhere to the surface of the fiber. Therefore, it is preferred to add a chelating agent. The chelating agent is not particularly specified, and examples of the chelating agent include polycarboxylic acid, nitrogen triacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), nitrilotrimethylenephosphonic acid, and hydroxyethylene. Diphosphonic acid (NTMP), phosphonic acid, glutamic acid diacetic acid, such salts and the like. The chelating agent is preferably added in an amount of 0.5 to 2.0 g/L to the aqueous solution at the time of alkali treatment. The cyclic oligomer in the alkaline aqueous solution dissolves when the liquid temperature is high, but precipitates when the liquid temperature is lower than 90 °C. In this case, precipitation and adhesion of the cyclic oligomer can be suppressed by performing liquid discharge at a high temperature of 90 to 95 ° C after the alkali treatment. [Soaping] An alkali solution remains on the bobbin body after draining, so it must be washed. Preferably, after draining, the yarn dyeing machine is filled with water, sodium hydrogen sulfite 0.5-2.0 g/L, and an oligomer dispersant are added, and after washing at 80 ° C for 10 minutes, the temperature is 40 to 60 ° C. After the water was washed with hot water for 10 minutes for 2 times or more, it was washed with water at normal temperature. The oligomer dispersing agent to be used is not particularly limited, and an amine-based nonionic compound, an alkylene oxide adduct of a fatty acid, a polycyclic nonionic compound, an alkyl sulfonate, or a polyhydric alcohol fatty acid ester can be used. The components such as an alkylene oxide adduct of a polyhydric alcohol fatty acid, an aromatic polyester resin, a carboxylate, and a polyaminocarboxylate are used singly or in combination. In the case of either alkaline or acidic, an amphoteric surfactant can be preferably used in order to prevent adhesion of the oligomer and remove the attached oligomer. The oligomer dispersant is preferably added in an amount of 0.5 to 3.0 g/L at the time of soaping. If it is less than 0.5 g/L, the adhesion preventing effect of the oligomer and the removal effect of the oligomer are deteriorated, and the amount of white powder adhering cannot be reduced. Further, when the amount of the oligomer dispersant added exceeds 3.0 g/L, the amount of white powder adhered can be reduced, but the linear oligomer which contributes to water absorption is also removed from the surface of the fiber, so that the water absorbability is deteriorated. [Neutralization] Regarding the acid used for neutralization, oxalic acid or acetic acid can be preferably used. At this time, it is also possible to suppress the precipitation and adhesion of the oligomer when it is acidic by using the oligomer dispersant in combination. The oligomer dispersant used in the neutralization is not particularly limited. In the case of either alkaline or acidic, an amphoteric surfactant can be preferably used in order to prevent adhesion of the oligomer. [Tulle Dyeing] The corrugated body of the present embodiment can also be dyed. In the case of use as a color yarn, the yarn can be directly dyed after alkali treatment with a yarn dyeing machine. [Finishing agent] The corrugating body of the present embodiment may be subjected to a softening agent for softening the texture or for lubricating the bath in order to improve the unwinding property of the yarn and the weaving property of the knitting, but It is not preferable to use a cationic softener or an oil such as eucalyptus to impede water absorption. [Rewinding] Further, the corrugated body of the present embodiment may be subjected to an alkali treatment by a yarn dyeing machine, and then rewinded by a winder to form a corrugated body. [Examples] Hereinafter, the present invention will be specifically described by way of examples. Of course, the invention is not limited to these. Further, the yarn winding system obtained in the examples was evaluated by the following method. (1) The amount of white powder adhered is the same as described above. (2) Quantification of a linear carboxylic acid oligomer of n=4 (a component soluble in THF) The above method was used. (3) Water-absorbent yarn is drawn from the yarn-wound body to produce a tubular knitted fabric, and the obtained tubular knitted fabric is refined and dried in a usual manner, and then JIS is washed 30 times by JIS L0217:1995 103 C method. L1907:2010 The water absorption of the obtained tubular knitted fabric was measured by a dropping method. In the present specification, the water absorbability obtained is referred to as "absorbent polyester fiber" water absorption. (4) Washing process The yarn is drawn from the bobbin body to produce a tubular knitted fabric, and the obtained tubular knitted fabric is refined and dried in a usual manner, and then subjected to the 103 C method of JIS L0217:1995, Schedule 1, and The obtained tubular knitted fabric was subjected to a washing treatment using a weakly alkaline detergent (trade name: Kao ATTACK) as a detergent. (5) Industrial washing treatment The yarn-like knitted fabric is drawn from the yarn-wound body, and the obtained tubular knitted fabric is refined and dried in a usual manner, and then an industrial washing test is assumed, and JIS L1096:2010 8.39 5 b) 2.2.2) Under the conditions of the F-2 medium temperature cleaning method, washing treatment was carried out using soap 0.8% owf, hydrogen peroxide 0.8% owf, sodium citrate 0.8% owf as a detergent. (6) Whether or not the knitted loops are pulled out of the yarn by the self-winding yarn body, and the shape of the yarn is observed without hanging the load. At this time, it is confirmed whether or not there is a loop curl derived from the knitted fabric. [Example 1] A polyester false twisted yarn (S element content: 0.14 wt%) having a circular cross section of 84 dtex/36f containing 2% by mol of sodium dimethyl isophthalate-5-sulfonate was taken up. A density of 0.5 g/cm 3 and a coiling amount of 3.0 kg were wound around a perforated tube for dyeing of the yarn. The tube in which the yarn is wound is attached to a yarn dyeing machine, and MARPON A-47 (made of Matsumoto Oil & Fat Pharmaceutical Co., Ltd., polycarboxylic acid blending product) having 10 g/L of sodium hydroxide as a chelating agent is used. The 2 g/L alkaline aqueous solution was heated at 2 ° C/min, and subjected to alkali treatment at a liquid temperature of 95 ° C for 60 minutes. After alkali treatment, it is directly drained at a liquid temperature of 95 ° C, and then water-injected, using a sodium bisulphite 1 g / L, as an oligomer dispersant, MARPON PS-K7 (Matsumoto Oil Pharmaceutical Co., Ltd.), amphoteric interfacial activity 2 g/L of the preparation, soaping at a liquid temperature of 80 ° C for 15 minutes, draining, and washing with hot water at a liquid temperature of 60 ° C for 3 minutes. After washing with hot water, drainage was performed, and after water supply again, 1 g/L of MARPON PS-K7 was used as an oligomer dispersant, followed by neutralization with acetic acid, followed by water washing. After draining, the tube in which the yarn is wound is taken out from the yarn dyeing machine, dehydrated by a centrifugal dehydrator, and then dried by a yarn dryer to obtain a bobbin body. The water-absorbing polyester fiber obtained by the crimped body has a reduction ratio of 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 is less than 1 second, and JIS L1096:2010 F- 2 The water absorption after washing for 30 times in the medium temperature cleaning method was 2 seconds. The amount of white powder adhered was 0.10 wt%. [Example 2] 1 kg/L of MARPON A-47 was used as a chelating agent in the alkali treatment, and 1 g/L of MARPON PS-K7 was used as an oligomer dispersing agent in soaping, and 0.5 in neutralization. A gauze body was obtained by the same method as in Example 1 except that the MARPON PS-K7 of g/L was used as an oligomer dispersant. The water-absorbing polyester fiber obtained by the crimped body has a reduction ratio of 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 is less than 1 second, and JIS L1096:2010 F- 2 The water absorption after washing for 30 times in the medium temperature cleaning method was 2 seconds. The amount of white powder adhered was 0.23 wt%. [Example 3] A corrugated body was obtained by the same method as in Example 1 except that 2 g/L of MARPON PS-K7 was used as the oligomer dispersing agent at the time of neutralization. The water-absorbent polyester fiber of the obtained bobbin body was reduced by 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 was 4 seconds, and JIS L1096:2010 F-2 was used. The water absorption after washing for 30 times in the intermediate temperature washing method was 15 seconds. The amount of white powder adhered was 0.05 wt%. [Comparative Example 1] A polyester false twisted yarn (S element content: 0.14 wt%) of a 84 dtex/36f circular cross section containing 2 mol% of sodium dimethyl isophthalate-5-sulfonate was taken up. A density of 0.5 g/cm 3 and a coiling amount of 3.0 kg were wound around a perforated tube for dyeing of the yarn. The alkali treatment was carried out by using a yarn dyeing machine, and the temperature was raised at 2 ° C/min using an alkaline aqueous solution containing 10 g of sodium hydroxide, and alkali treatment was carried out at a liquid temperature of 95 ° C for 60 minutes. After the alkali treatment, the mixture was directly drained at 95 ° C, and then water was injected. The mixture was subjected to soaping at a liquid temperature of 80 ° C for 15 minutes, and then drained, and washed with hot water at a liquid temperature of 60 ° C for 3 minutes. After washing with hot water, it was drained, and after water supply again, it was neutralized with acetic acid and washed with water. After draining, it was taken out from the yarn dyeing machine, dehydrated by a centrifugal dehydrator, and then dried by a yarn dryer to obtain a bobbin body. The water-absorbent polyester fiber of the obtained bobbin body was reduced by 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 was 15 seconds, and JIS L1096:2010 F-2 was used. The water absorption after washing for 30 times in the intermediate temperature washing method was 15 seconds. The amount of white powder adhered was 0.73 wt%. [Comparative Example 2] The same treatment as in Comparative Example 1 was carried out, except that 2 g/L of MARPON A-47 was used as the oligomer dispersant in the soaping, to obtain a corrugated body. The water-absorbing polyester fiber obtained by the crimped body has a reduction ratio of 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 is less than 1 second, and JIS L1096:2010 F- 2 The water absorption after washing for 30 times in the medium temperature cleaning method was 2 seconds. The amount of white powder adhered was 0.64 wt%. [Comparative Example 3] 2 g/L of MARPON A-47 was used as an oligomer dispersant in soaping, and 1 g/L of MARPON PS-K7 was used as an oligomer dispersing agent at the time of neutralization, in addition to The same treatment as in Comparative Example 1 was carried out to obtain a corrugated body. The water-absorbing polyester fiber obtained by the crimped body has a reduction ratio of 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 is less than 1 second, and JIS L1096:2010 F- 2 The water absorption after washing for 30 times in the medium temperature cleaning method was 2 seconds. The amount of white powder adhered was 0.52 wt%. [Comparative Example 4] The same treatment as in Comparative Example 1 was carried out except that 2 g/L of MARPON A-47 was used as the oligomer dispersant in the alkali treatment, and a corrugated body was obtained. The water-absorbing polyester fiber obtained by the crimped body has a reduction ratio of 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 is less than 1 second, and JIS L1096:2010 F- 2 The water absorption after washing for 30 times in the medium temperature cleaning method was 2 seconds. The amount of white powder adhered was 0.47 wt%. [Comparative Example 5] The same treatment as in Example 1 was carried out, except that the liquid discharge temperature after the alkali reduction was 70 ° C, to obtain a corrugated body. The water-absorbent polyester fiber of the obtained bobbin body was reduced by 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 was 6 seconds, and JIS L1096:2010 F-2 was used. The water absorption after washing for 30 times in the intermediate temperature washing method was 13 seconds. The amount of white powder adhered was 0.82 wt%. [Comparative Example 6] The same treatment as in Example 1 was carried out except that 6 g/L of MARPON PS-K7 was used as the oligomer dispersant at the time of neutralization, and a corrugated body was obtained. The water-absorbent polyester fiber obtained by the crimping body has a reduction ratio of 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 is 7 seconds, and JIS L1096:2010 F-2 is used. The water absorption after washing for 30 times in the intermediate temperature washing method was 15 seconds. The amount of white powder adhered was 0.03 wt%. [Comparative Example 7] The same treatment as in Example 1 was carried out, except that 6 g/L of MARPON PS-K7 was used as the oligomer dispersant in the soaping, to obtain a corrugated body. The water-absorbent polyester fiber of the obtained bobbin body was reduced by 6.0%, and the water absorption after washing 30 times by the 103 C method of JIS L0217:1995, Table 1 was 8 seconds, and JIS L1096:2010 F-2 was used. The water absorption after washing for 30 times in the intermediate temperature washing method was 15 seconds. The amount of white powder adhered was 0.03 wt%. [Comparative Example 8] The same treatment as in Example 1 was carried out, except that 84 dtex/36f circular-section polyester false-twist yarn of a general polyester containing no sulfonic acid was used, and a bobbin body was obtained. The water-absorbent polyester fiber of the obtained bobbin body is washed by the 103 C method of JIS L0217:1995, Table 1 after 30 times, and has a water absorption of 180 seconds or more, and is washed by a medium temperature cleaning method using JIS L1096:2010 F-2. The water absorption after 30 times was 180 seconds or more. The amount of white powder adhered was 0.02 wt%. The production conditions and physical property values of the polyester bolls obtained in the above Examples 1 to 3 and Comparative Examples 1 to 8 are shown together in Table 2 below. [Table 2] [Industrial Applicability] The bobbin body of the water-absorbent polyester fiber of the present invention does not generate white powder in the rewinding step or the weaving step of the bobbin, and can absorb water semi-permanently even when the water absorbing process is not performed. The sweat is quickly absorbed, and the comfort is excellent, and the skin is soft and the touch is good. Therefore, it can be preferably used for underwear, casual clothes, and the like.