CN108004771A - 一种环保浆料助剂及其制备方法与应用 - Google Patents
一种环保浆料助剂及其制备方法与应用 Download PDFInfo
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- CN108004771A CN108004771A CN201711118456.8A CN201711118456A CN108004771A CN 108004771 A CN108004771 A CN 108004771A CN 201711118456 A CN201711118456 A CN 201711118456A CN 108004771 A CN108004771 A CN 108004771A
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- D06M13/402—Amides imides, sulfamic acids
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Abstract
本发明公开了一种环保浆料助剂及其制备方法与应用,主要应用于纤维素纤维或混纺纤维的上浆;其特征在于:包括主料和助剂,各成分在浆料中的质量百分比为:主料95%-98%,助剂2%-5%,所述助剂按质量百分比由如下原料制得:淀粉降粘剂1%‑1.2%;增塑剂8%‑10%;润湿渗透剂10%‑13%;柔软平滑剂2%‑3%;消泡剂1.5%‑2%;余量为去离子水;本发明助剂用于纯淀粉上浆,适用于各种纤维素纤维以及涤棉混纺纤维,不添加任何合成浆料,真正实现无PVA上浆。
Description
技术领域:
本发明涉及一种环保浆料助剂及其制备方法与应用,主要应用于纤维素纤维或混纺纤维的上浆。
背景技术:
众所周知,在织造过程中,经纱受到较大的张力和摩擦,易发生断裂。为了减少断经,提高织造效率和坯布质量,在织造前需要对经纱进行上浆处理,使纱线中的纤维黏着抱合起来,并在纱线表面形成一层牢固的浆膜,使纱线变得紧密和光滑,从而提高纱线的断裂强力和耐磨性。传统上浆工艺,无论是纯棉产品或是涤棉产品,通常采用混合浆料比如PVA和淀粉共混的浆料,此类浆料由于添加了PVA,对合成纤维和纤维素纤维有着优良的黏附性能,成膜性好,浆纱的断裂强力高,但在具体的生产工艺中,由于纱线是并在一起进行上浆,不可避免的造成了纱线与纱线之间容易粘结在一起,经烘燥固化后,在干分绞时,容易产生二次毛羽,对后续的织造带来极大地问题,并且PVA是一种合成高分子化合物,浆纱表面的浆料难以在退浆过程中完全去除,坯布表面会产生“浆斑”,而且PVA不能生物降解,对环境带来严重危害。基于此,纯淀粉上浆应运而生。天然淀粉也是一种高分子化合物,结晶度较高,在水中,淀粉分子通过氢键和范德华力作用,形成紧密的网状结构,粘度很高,难以成膜。因此,需要对原淀粉进行物理变构或化学作用,改善淀粉的性能,使其能用于纤维素纤维或混纺纤维的上浆。
现有文献中较少有关纯淀粉上浆工艺的报道,多是有关变性淀粉以及混合浆料的研究,例如CN 105113242 A公开了一种用于纺织上浆的纺织助剂及制备方法,由以下原料制得:纳米材料、石墨、水溶性单体、水溶性引发剂、油溶性单体、油溶性引发剂、分散剂、淀粉、碱性物质、消泡剂和水。该发明助剂对全面上浆完全不用PVA,织造效率高,浆料成本低;对涤棉上浆,可用1:10取代PVA。该发明助剂无毒,无害,环保,并且无需改变现有的上浆工艺,易于推广。在对涤棉产品上浆,仍然添加了少量PVA,并且所用的纳米材料和石墨价格较贵,造成实际生产中成本较高,难以推广。
发明内容:
针对全棉或涤棉产品上浆过程中需要使用混合浆料,实际生产中易产生二次毛羽的问题以及退浆过程中,退浆不净,且给环境带了很大的负担。本发明的第一方面目的就是制备一种环保浆料助剂,用于纯淀粉上浆,实现无PVA上浆,第二个目的就是解决实际生产中产生的二次毛羽问题,提高织造效率。
本发明为了实现上述目的采用的技术方案如下:
一种环保浆料助剂,其特征在于,按质量百分比由如下原料制得:
所述的淀粉降粘剂为盐酸、亚硫酸氢钠、亚硫酸钠、硫代硫酸、硅酸钠的任意几种的混合物。淀粉降粘剂在助剂中所占质量百分比为1%-1.2%。淀粉降粘剂通过化学作用破坏淀粉分子中的α-1,4-苷键,降低淀粉的聚合度,达到降低粘度的作用,同时降粘剂中的亚硫酸钠起到控制淀粉聚合度的作用,使浆料的粘度范围控制在10—15mpa.s,不影响淀粉浆对纱线的黏附及成膜;
所述的增塑剂为甘油、丙三醇、山梨醇、乙三醇或柠檬酸二氢铵中的一种或两种以上的混合物,其在助剂中所占质量百分比为8%—10%。由于玉米原淀粉的结晶度高达39%,高结晶度的聚集态结构决定了它具有高的玻璃化温度并且其熔融温度远高于其分解温度。基于此,通过添加增塑剂,一些小分子的多元醇,含有很多羟基与淀粉分子上的羟基形成氢键,破坏其结晶态结构,使淀粉分子的双螺旋结构打开,淀粉分子链得到降解,形成热塑性淀粉,极大地改善了淀粉原有的性能。
所述润湿渗透剂为脂肪醇聚氧乙烯醚、丁基奈磺酸钠或异辛基硫酸盐中的一种或两种以上混合物,其在助剂中所占质量百分比为10%—13%。由于天然纤维的棉蜡和合成纤维的油剂会阻碍浆液的渗透,加入润湿渗透剂,能够有效降低淀粉浆料的表面张力,有利于浆液更好地润湿纱线并渗透到纱线内部。
所述的柔软平滑剂为璜化琥珀酸酯、脂肪醇磷酯或聚乙二醇脂肪酸酯中的一种或两种以上混合物,由于纯淀粉上浆形成的浆膜较为硬脆,不利于织造,因此,其在助剂中所占质量百分比为2%—3%。加入柔软平滑剂,能有效改善浆膜的断裂强度以及断裂伸长率,并且柔软平滑剂中含有较多的亲水基团,能够使浆纱保持较高的回潮率,柔韧性得到提高,利于织造。
所述的消泡剂为聚氧乙烯醇水合物、硬脂酸乙二醇酯或二甲基聚硅氧烷中的一种或两种以上混合物,其在助剂中所占质量百分比为1.5%—2%。在调浆过程中由于搅拌速度过快或升温不稳定,会产生泡沫,通过添加少量消泡剂可有效抑制泡沫的产生,使浆液保持一个稳定的状态。
本发明的第二方面目的是提供一种环保浆料助剂的制备方法,其特征在于,包括以下步骤:
(1)在带有搅拌器和冷凝装置的三口烧瓶中,加入去离子水,开启反应装置,设定水浴锅的温度在45℃-55℃范围内;
(2)在45℃-55℃范围内,将降粘剂、润湿渗透剂和柔软平滑剂加入三口烧瓶内,搅拌30min,然后转入烧杯中待用;
(3)将步骤二中待用的乳液转入高速乳化机中乳化30min中,之后将增塑剂和消泡剂加入乳化机中共混20min中,得到半透明乳白色乳液;
(4)最后加入氨水调节乳液的pH值至中性,得到环保浆料助剂。
本发明的第三方面目的是提供一种环保浆料助剂的应用,其特征在于,包括以下步骤:全棉或涤棉纱线——整经——并轴、上浆——烘干——干分绞——织造——烧毛、退浆——后处理,其中:
(1)整经:
将筒子上的纱线通过整经机卷绕到经轴上,整经张力、排列、卷绕三均匀是浆轴三均匀的基础,因此需要选择合理的整经参数,具体如下:整经小张力为 10—15cN,大张力为15—25cN,整经速度控制在300—500m/min,整经好轴率需达到98%;
(2)并轴、上浆:
工艺流程:将经轴的纱线按一定的排列,依次送入浆槽中上浆,上浆工艺参数如下:浆液温度为85—95℃、浆纱车速为70—80m/min、上浆压力为20—25KN、浆液粘度为6-6.5s;
浆料配置方法如下:
将制备好的助剂放在一旁待用,若是需要对涤棉棉产品上浆,调整浆液的配方如下:精制玉米淀粉75Kg,环保助剂用量6L,总体积为900L。先将淀粉倒入高压桶,加入900L水,热焖浆30min,打入低压桶,加入助剂,搅拌均匀,调浆温度控制在95℃范围内。
本发明的浆料采用的是纯淀粉浆料,优选采用精制玉米原淀粉,普通的工业淀粉通常含有较多的蛋白质、脂肪、灰分等杂质,需要对原淀粉精制加工后才能使用,否则会使浆液泛黄,甚至使浆纱产生疵点等。经过精制后,原淀粉所含的杂质较低,利于后续的调浆及上浆工艺。
在选定工艺参数时,保持平稳的车速以及高的浆液温度和上浆压力,平稳的车速可以使纱线在浆槽中浸透较长时间,从而使浆料更加充分的渗透进纱线内部;高的浆液温度可以使浆料的粘度下降,浆料分子的流动性增加,有利于浆液的润湿和浸透,并且可以去除纤维上的一些杂质,使浆液比较充分地浸透到纱线内部,使浆料在纱线被覆少;较高的上浆压力,将纱线内部多余的空气挤压出去,使浆料尽可能多地渗透到纱线内部,增加纱线内纤维的粘结作用,通过实验,最终确定最佳工艺如下:浆液温度为85—95℃、浆纱车速为70—80m/min、上浆压力为 20—25KN、浆液粘度为6-6.5s;
(3)烘干:
纱线经过上浆后,经过烘筒烘干时,严格控制烘燥温度以及时间,由于经纱是由很多纤维加捻而成的,其纤维与纤维之间存在较多的空隙,表面粗糙,浆液能渗透进纱线内部空隙中,在烘燥过程中,大部分水分被蒸发,而浆料则留在纱线表面及内部,并且固化形成一种机械结合的黏附,而由于采用纯淀粉上浆,需要保持一个较高的回潮率,若是回潮率过低,浆纱将变得脆硬,不利于分绞及织造,因此,纯棉产品的回潮率控制11%-15%,涤棉产品的回潮率控制7%-9%,使浆纱保持一个较为柔软的状态,易于后续的分绞及织造,烘干工艺参数如下:烘燥温度为60℃—80℃、烘燥时间为3min;
(4)烧毛、退浆:
由于采用的是纯淀粉上浆,因此,选择淀粉酶进行退浆,淀粉酶是一种高效的酶制剂,对淀粉的水解有高效催化的作用,退浆效率高,不会损伤纤维素纤维;将织造后的梭织物通过烧毛-退浆一体机,具体的流程为进布——烧毛——打布——浸轧淀粉酶溶液——汽蒸——打卷堆置,其工艺参数为:退浆温度为60℃—70℃、退浆时间为30min、淀粉酶用量为1g/L。
淀粉酶优选为中温淀粉酶,特别优选中温α-淀粉酶。
与现有技术相比,本发明有如下有益效果:
本发明助剂所含有机物均可降解,对环境无污染,无腐蚀性,属环保型产品,调浆工艺简单,易推广使用;
本发明助剂用于纯淀粉上浆,适用于各种纤维素纤维以及涤棉混纺纤维,不添加任何合成浆料,真正实现无PVA上浆;
本发明采用的纯淀粉上浆工艺解决了传统工艺中干分绞造成的二次毛羽问题,极大地提高了织造效率,减少了断经次数;
本发明助剂可有效降低原淀粉的分子量,改善浆料的流动性,使淀粉浆更充分地浸透纱线内部,提升上浆效果;
本发明由于采用的是纯淀粉上浆工艺,在退浆过程中,可完全用淀粉复合酶退浆,无须添加任何酸、碱、氧化剂等,且无须高温,即可退浆,既有利于环保,且减少了能耗。
以下结合具体实施方式对本发明做进一步说明。
具体实施方式:
实施例1:
一种环保浆料助剂,按质量百分比的以下原料制得:
制备环保浆料助剂:
(1)在带有搅拌器和冷凝装置的三口烧瓶中,加入一定量的去离子水,开启反应装置,设定水浴锅的温度在45℃-55℃范围内;
(2)在45℃-55℃范围内,将一定量的降粘剂、润湿渗透剂和柔软平滑剂加入三口烧瓶内,搅拌30min,然后转入烧杯中待用;
(3)将步骤二中待用的乳液转入高速乳化机中乳化30min中,之后将一定量的增塑剂和消泡剂加入乳化机中共混20min中,得到半透明乳白色乳液;
(4)最后加入少量氨水调节乳液的pH值至中性,得到浆料助剂。
制备浆料:
将制备好的助剂放在一旁待用,若是需要对涤棉棉产品上浆,调整浆液的配方如下:精制玉米淀粉75Kg,环保助剂用量6L,总体积为900L。先将淀粉倒入高压桶,加入900L水,热焖浆30min,打入低压桶,加入助剂,搅拌均匀,调浆温度控制在95℃范围内。
涤棉产品织造工艺流程:
涤棉纱线——整经——并轴、上浆——烘干——干分绞——织造——烧毛、退浆——后处理,其中:
(1)整经:
将筒子上的纱线通过整经机卷绕到经轴上,整经张力、排列、卷绕三均匀是浆轴三均匀的基础,因此需要选择合理的整经参数,具体如下:整经小张力为 10—15cN,大张力为15—25cN,整经速度控制在300—500m/min,整经好轴率需达到98%;
(2)并轴、上浆:
将经轴的纱线按一定的排列,依次送入浆槽中,由于采用的是纯淀粉浆料,辅之以专用助剂,在选定工艺参数时,保持平稳的车速以及高的浆液温度和上浆压力,平稳的车速可以使纱线在浆槽中浸透较长时间,从而使浆料更加充分的渗透进纱线内部;高的浆液温度可以使浆料的粘度下降,浆料分子的流动性增加,有利于浆液的润湿和浸透,并且可以去除纤维上的一些杂质,使浆液比较充分地浸透到纱线内部,使浆料在纱线被覆少;较高的上浆压力,将纱线内部多余的空气挤压出去,使浆料尽可能多地渗透到纱线内部,增加纱线内纤维的粘结作用,具体的工艺参数如下:浆液温度为85—95℃、浆纱车速为70—80m/min、上浆压力为20—25KN、浆液粘度为6-6.5s;
(3)烘干:
纱线经过上浆后,经过烘筒烘干时,严格控制烘燥温度以及时间,由于经纱是由很多纤维加捻而成的,其纤维与纤维之间存在较多的空隙,表面粗糙,浆液能渗透进纱线内部空隙中,在烘燥过程中,大部分水分被蒸发,而浆料则留在纱线表面及内部,并且固化形成一种机械结合的黏附,而由于采用纯淀粉上浆,需要保持一个较高的回潮率,若是回潮率过低,浆纱将变得脆硬,不利于分绞及织造,因此,纯棉产品的回潮率控制11%-15%,涤棉产品的回潮率控制7%-9%,使浆纱保持一个较为柔软的状态,易于后续的分绞及织造,烘干工艺参数如下:烘燥温度为60℃—80℃、烘燥时间为3min;
(4)烧毛、退浆:
由于采用的是纯淀粉上浆,因此,选择淀粉酶进行退浆,淀粉酶是一种高效的酶制剂,对淀粉的水解有高效催化的作用,退浆效率高,不会损伤纤维素纤维;将织造后的梭织物通过烧毛-退浆一体机,具体的流程为进布——烧毛——打布——浸轧淀粉酶溶液——汽蒸——打卷堆置,其工艺参数为:退浆温度为60℃—70℃、退浆时间为30min、淀粉酶用量为1g/L。
实施例效果检测:如表1-表3所示。
1、应用本浆料助剂及上浆工艺,烘燥时温度控制在60℃,时间为3min,浆纱的回潮率可达到9%,浆纱较为柔软,进行干分绞时,速度快,二次毛羽少;而采用现有浆料进行上浆时,由于烘燥温度较高,回潮率低,浆纱与浆纱之间粘结在一起,进行干分绞时,容易产生二次毛羽;
2、应用本实施例浆料与现有浆料(PVA淀粉共混浆料)上浆后的浆纱对比,取相同米数及相同纤维,在相对湿度恒定条件下,测试其断裂强力及耐磨性,本发明浆料的增强率为25%,现有浆料的增强率为24%,本发明浆料的增磨率为17%,现有浆料的增磨率为15%。从数据对比可看出,本发明在没有使用合成浆料及变性淀粉的情况下,浆纱的性能保持稳定。
实施例2:
一种环保浆料助剂,包括主料和助剂,其中主料为精制玉米原淀粉,助剂按质量百分比的如下原料制得:
制备环保浆料助剂:
环保浆料助剂的制备方法同实施例1。
制备浆料:
本实施例制备浆料的方法同实施例1。
将本实施例制备的浆料应用于涤棉产品织造工艺流程:
将涤棉纱线通过整经机卷绕到经轴上(整经速度为300-400m/min),经轴上的纱线再通过浆槽,浆液温度为90℃,上浆压力为23KN,浆纱速度为75m/min,经过烘筒烘燥时,温度为75℃,时间为3min,控制回潮率为8%,干分绞后转入织轴上。
实施例效果检测:如表1-表3所示。
1、应用本实施例的浆料助剂及上浆工艺,较高的浆液温度以及助剂的双重作用下,浆液的粘度大幅降低,在较高的上浆压力下,浆液容易浸透到纱线内部,填充纤维与纤维之间的空隙,当水分蒸发后,形成一种“机械黏附”,同时由于在热的作用下,浆液的流动性大幅提升,贴伏纱线表面的毛羽;
2、应用本实施例浆料与现有浆料(PVA淀粉共混浆料)上浆后的浆纱对比,本实施例的浆纱手感柔软平滑,表面毛羽少,现有的手感明显偏硬,浆料被覆较多。因此,在织造过程中,本发明的由于浆纱柔软平滑,低的表面磨擦系数,有效地增加浆纱的耐磨性,并且上浆后的浆纱保持较高的回潮率,可以在60%的低湿度下进行织造。
实施例3:
一种环保浆料助剂,包括主料和助剂,其中主料为精制玉米原淀粉,助剂按质量百分比的如下原料制得
制备环保浆料助剂:
环保浆料助剂的制备方法同实施例1。
制备浆料:
本实施例制备浆料的方法同实施例2。
将本实施例制备的浆料应用于涤棉产品织造工艺流程:
将涤棉纱线通过整经机卷绕到经轴上(整经速度为300-400m/min),经轴上的纱线再通过浆槽,浆液温度为95℃,上浆压力为25KN,浆纱速度为80m/min,经过烘筒烘燥时,温度为80℃,时间为3min,控制回潮率为7%,干分绞后转入织轴上。
实施例效果检测:如表1-表3所示。
1、应用本浆料助剂以及纯淀粉上浆工艺,在对涤棉等混纺纤维进行上浆时,无须添加任何合成浆料,上浆后的浆纱仍保持稳定的性能。主要原因是本发明助剂中添加了增塑剂(柠檬酸氢铵和尿素),在制备浆料时,能够与淀粉分子结合,改变淀粉分子原有的聚集态结构,形成“热塑性淀粉”。因此,在对涤棉产品上浆时,浆料分子进入纱线内部,在热和剪切力的作用下,发生塑化作用,使纤维与纤维之间紧密的黏着在一起,浆纱的断裂强力和断裂伸长率优于大部分变性淀粉,在断裂强力方面甚至优于PVA;
2、应用本实施例浆料与现有浆料(PVA淀粉共混浆料)上浆后的浆纱对比,现有的需要在高温蒸汽下烘干,原因是变性淀粉或是合成浆料吸附在纱线表面较多,若是水分蒸发未净,在干分绞和织造过程中会产生“落浆”现象;而本发明的并不需要在高温蒸汽下烘干,浆纱保持柔软弹性的状态。
实施例1-3制备的助剂性能及应用效果统计:
表1、实施例1-3制得的环保助剂各项性能指标
表2、实施例1-3制得的纯淀粉浆料对涤棉的粘附力
表3、实施例1-3的浆料应用于涤棉纱线上浆的性能对比表
分析:
由表1可知:本发明制备的助剂所含有机物均可降解,对环境无污染,无腐蚀性,属环保型产品,且调浆工艺简单,能与纯淀粉混合均匀,可改善纯淀粉的各项性能,具有良好的稳定性,长期放置不会分层;
由表2可知:实施例1-3制备的浆料对涤棉的粘附力稍低于PVA浆料,优于氧化淀粉。表明本发明环保助剂应用于纯淀粉上浆,改善了纯淀粉的各项性能,增强了对涤棉的粘附力。
由表3可知:实施例1-3采用的上浆工艺对涤棉纱线进行上浆,断裂强力和断裂伸长方面由于氧化淀粉,断裂强力甚至好过PVA浆料;耐磨次数也有所提高;运用纯淀粉上浆工艺很大程度上降低了毛羽。
Claims (9)
1.一种环保浆料助剂,其特征在于:按质量百分比由如下原料制得:
淀粉降粘剂 1%-1.2%
增塑剂 8%-10%
润湿渗透剂 10%-13%
柔软平滑剂 2%-3%
消泡剂 1.5%-2%
余量为去离子水。
2.根据权利要求1所述的一种环保浆料助剂,其特征在于:所述的淀粉降粘剂为盐酸、亚硫酸氢钠、亚硫酸钠、硫代硫酸、硅酸钠的任意几种的混合物。
3.根据权利要求1所述的一种环保浆料助剂,其特征在于:所述的增塑剂为甘油、丙三醇、山梨醇、乙三醇或柠檬酸二氢铵中的一种或两种以上的混合物。
4.根据权利要求1所述的一种环保浆料助剂,其特征在于:所述润湿渗透剂为脂肪醇聚氧乙烯醚、丁基奈磺酸钠或异辛基硫酸盐中的一种或两种以上混合物。
5.根据权利要求1所述的一种环保浆料助剂,其特征在于:所述的柔软平滑剂为璜化琥珀酸酯、脂肪醇磷酯或聚乙二醇脂肪酸酯中的一种或两种以上混合物。
6.根据权利要求1所述的一种环保浆料助剂,其特征在于:所述的消泡剂为聚氧乙烯醇水合物、硬脂酸乙二醇酯或二甲基聚硅氧烷中的一种或两种以上混合物。
7.根据权利要求1所述的一种环保浆料助剂,其特征在于:按质量百分比的以下原料制得:
盐酸、亚硫酸钠和硅酸钠 0.9%
乙三醇或/和丙三醇 8%
脂肪醇聚氧乙烯醚或/和丁基奈磺酸钠 10%
璜化琥珀酸酯或/和脂肪醇磷酯 2%
聚氧乙烯醇水合物或/和硬脂酸乙二醇 1%
余量为去离子水。
8.一种环保浆料助剂的制备方法,其特征在于,包括以下步骤:
(1)在带有搅拌器和冷凝装置的三口烧瓶中,加入去离子水,开启反应装置,设定水浴锅的温度在45℃-55℃范围内;
(2)在45℃-55℃范围内,将降粘剂、润湿渗透剂和柔软平滑剂加入三口烧瓶内,搅拌30min,然后转入烧杯中待用;
(3)将步骤(2)中待用的乳液转入高速乳化机中乳化30min中,之后将增塑剂和消泡剂加入乳化机中共混20min中,得到半透明乳白色乳液;
(4)最后加入氨水调节乳液的pH值至中性,得到浆料助剂。
9.一种环保浆料助剂的应用,其特征在于,包括以下步骤:全棉或涤棉纱线——整经——并轴、上浆——烘干——干分绞——织造——烧毛、退浆——后处理,其中:
(1)整经:
将筒子上的纱线通过整经机卷绕到经轴上,整经参数如下:整经小张力为10—15cN,大张力为15—25cN,整经速度控制在300—500m/min,整经好轴率需达到98%;
(2)并轴、上浆:
工艺流程:将经轴的纱线按一定的排列,依次送入浆槽中上浆,上浆工艺参数如下:浆液温度为85—95℃、浆纱车速为70—80m/min、上浆压力为20—25KN、浆液粘度为6-6.5s;
浆料配置方法如下:
将制备好的助剂放在一旁待用,若是需要对涤棉棉产品上浆,调整浆液的配方如下:精制玉米淀粉75Kg,环保助剂用量6L,总体积为900L;
先将淀粉倒入高压桶,加入900L水,热焖浆30min,打入低压桶,加入助剂,搅拌均匀,调浆温度控制在95℃范围内;
(3)烘干:
纱线经过上浆后,经过烘筒烘干时,严格控制烘燥温度以及时间,烘干工艺参数如下:烘燥温度为60℃—80℃、烘燥时间为3min;纯棉产品的回潮率控制11%-15%,涤棉产品的回潮率控制7%-9%;
(4)烧毛、退浆:
工艺流程为进布——烧毛——打布——浸轧淀粉酶溶液——汽蒸——打卷堆置;
工艺参数为:退浆温度为60℃—70℃、退浆时间为30min、淀粉酶用量为1g/L。
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