CN108866825A - 一种超细纤维长纤无纺布的制造方法 - Google Patents
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Abstract
一种超细纤维长纤无纺布的制造方法,利用PET‑PA6双组份中空橘瓣型纺粘水刺布,经碱(NaOH)减量后处理,溶解掉全部或部分PET,以此达到完全开纤的效果。本发明使用的长丝铺网工艺可使得产品中不含纤维断头,减少对皮肤的钩挂,提高触感,降低敏感;大幅提高了面膜基材的纤维细度,使面膜基材的柔软度以及贴肤度有了质的提升。
Description
技术领域
本发明涉及长纤无纺布领域,具体涉及一种超细纤维长纤无纺布的制造方法。
背景技术
超细纤维,一般指的是纤维细度低于0.3D的纤维,这个细度很难直接通过化学纺丝或溶液纺丝做到,常见的超细纤维是通过双组份纺丝工艺制成一根粗纤维短纤,然后铺网加固成布后再通过后处理工艺分散形成多根超细纤维,主要有橘瓣型(如附图2所示)和海岛型(如附图3所示)两种形式。
传统无纺布面膜基材一般采用粘胶、涤纶或莱赛尔短纤维,经过梳理水刺工艺制成。因其成本低廉,产量高,吸水性好而广泛用于面膜领域,但梳理工艺能适应的纤维细度有限,单根的超细纤维不适合梳理生产线,故传统面膜基材中并没有超细纤维的一席之地。
发明内容
针对背景技术提及超细纤维的制造难点,本发明通过提供一种超细纤维长纤无纺布的制造的解决方法。
一种超细纤维长纤无纺布的制造方法,包括如下步骤:
步骤1,干燥PET原料和PA6原料,使得PET原料含水率降至30ppm以下,PA6原料含水率降至100ppm以下;
步骤2,干燥后的原料进入螺杆,分段逐级升温加热,使原料熔融,并排出空气,过滤异物后稳定的进入熔体管道;
步骤3,两种原料通过计量泵后进入组件,在组件内复杂的通道内流动,最终汇集成两种原料间隔围成一圈的不止一股熔体细流,并从一个喷丝孔挤出;
步骤4,从喷丝板挤出的复合的熔体细流,在侧吹风的作用下温度逐渐冷却凝固;
步骤5,冷却过的丝束通过压缩空气填充的牵伸管,在高速风的带动下牵伸拉长变细,直至达到纺丝要求的细度;
步骤6,丝束在牵伸管出口处通过机械装置打散并均匀地铺在成网帘上,形成蓬松均匀的纤网;
步骤7,从水刺头的高压腔体***出的极细水流(高压水针)直接作用在纤网表面,将纤网表面的纤维刺入内部,在托网帘上反弹后又将反面的纤维反刺回来,使得纤维之间形成抱合缠结,将蓬松的纤网变成有强力的布;
步骤8,将PET与PA6复合而成的基布浸泡在NaOH溶液中,将PET部分溶解或全部溶解;
步骤9,稀释并清洗碱液,调节布的PH值,使之呈中性偏酸性;
步骤10,使用带针排的烘干设备,在固定布边控制门幅的条件下将产品烘干定型。
进一步的,所述步骤1的烘干操作采用经除湿处理后的热空气进行烘干。
进一步的,所述步骤3熔体细流的瓣数在8~32之间,优选为16。
进一步的,所述步骤9使用少量的冰醋酸进行PH值的调节。
进一步的,所述步骤9采用工业水进行稀释碱液。
有益效果:与现有技术相比,本发明使用的长丝铺网工艺可使得产品中不含纤维断头,减少对皮肤的钩挂,提高触感,降低敏感;大幅提高了面膜基材的纤维细度,使面膜基材的柔软度以及贴肤度有了质的提升。
附图说明
图1:本发明的工艺流程图;
图2:双组份中空橘瓣型超细纤维示意图;
图3:双组份海岛型超细纤维示意图;
图4:普通短纤水刺布的宏观图;
图5:普通短纤水刺布的微观图;
图6:依据本发明制造的超短长丝水刺布的宏观图;
图7:依据本发明制造的超短长丝水刺布的微观图;
图8:本发明步骤3的组件的结构示意图。
图中:1-喷丝板;2-沙腔及过滤网;3-熔体入口。
具体实施方式
现结合附图对本发明的一个实施例做进一步地阐述。
本发明是利用PET-PA6双组份中空橘瓣型纺粘水刺布,经碱(NaOH)减量后处理,溶解掉全部或部分PET,达到完全开纤效果得到的。
双组份中空橘瓣型纺粘水刺无纺布工艺是指将PET、PA6两种材料干燥后熔融,通过特殊纺丝组件将两种组分以一定排列和配比挤出喷丝孔,从而形成如图4的特殊纤维截面,而后牵伸铺网,再通过高压水针加固并初步开纤形成无纺布的工艺。双组份中空橘瓣型纺粘水刺无纺布工艺一般用于皮革基布制造,旨在不做碱减量处理的前提下,通过水刺开纤得到超细纤维无纺布,来替代传统海岛型短纤针刺无纺布减量后的基布。
双组份中空橘瓣型纺粘水刺基布由于含有不吸水、刚性高的涤纶PET,导致双组份中空橘瓣型纺粘水刺基布骨感强、硬挺,且其吸水性差、开纤率不高,以至于柔软度不够高。但双组份中空橘瓣型纺粘水刺基布在经过碱减量工艺,将组分中的PET组分做完全减量或不完全减量后,可使得纤维完全开纤,使得纤维细度降低,柔软度提高。PET含量减少,手感变的柔软悬垂,且通过改变成分配比和改变纤维结构两方面来共同提高材料的吸水率;与此同时,因为超细纤维的比表面积大,吸水后通过水的表面张力作用可使得材料牢牢的贴服在人体皮肤表面,形成一种传统面膜纸无法比拟的贴肤感。
海岛型超细或中空橘瓣型超细纤维通过制成短纤布后再做后处理,一般需要原布克重在200gsm以上,以保证强力,避免在后处理工艺中损坏,这样处理出的布克重过高,不适合面膜布常用的30-50g左右的要求,而橘瓣型纺粘布中的纤维是长丝,很好的克服了这一难题,80-100gsm的基布即可满足后处理工艺的强力需求,可以制得最低30gsm的面膜基材。
一种超细纤维长纤无纺布的制造方法,包括如下步骤:
步骤1,干燥PET原料和PA6原料,通过经过除湿操作的热空气烘干,使得PET原料含水率降至30ppm以下,PA6原料含水率降至100ppm以下;
步骤2,干燥后的原料进入螺杆,分段逐级升温加热,使原料熔融,并排出空气,过滤异物后稳定的进入熔体管道;
步骤3,两种原料通过计量泵后进入组件,在组件内复杂的通道内流动,最终汇集成两种原料间隔围成一圈的不止一股熔体细流,并从一个喷丝孔挤出;
步骤4,从喷丝板挤出的复合的熔体细流,在侧吹风的作用下温度逐渐冷却凝固;
步骤5,冷却过的丝束通过压缩空气填充的牵伸管,在高速风的带动下牵伸拉长变细,直至达到纺丝要求的细度;
步骤6,丝束在牵伸管出口处通过机械装置打散并均匀地铺在成网帘上,形成蓬松均匀的纤网;
步骤7,从水刺头的高压腔体***出的极细水流(高压水针)直接作用在纤网表面,将纤网表面的纤维刺入内部,在托网帘上反弹后又将反面的纤维反刺回来,使得纤维之间形成抱合缠结,将蓬松的纤网变成有强力的布;
步骤8,将PET与PA6复合而成的基布浸泡在NaOH溶液中,给予一定的时间和温度,将PET部分溶解或全部溶解;
步骤9,稀释并清洗碱液,使用少量的冰醋酸调节布的PH值,使之呈中性偏酸性;
步骤10,使用带针排的烘干设备,在固定布边控制门幅的条件下将产品烘干定型。
本发明步骤3所述的组件其结构示意图如附图8所示,包括喷丝板1、沙腔及过滤网2和熔体入口3,两种原料通过计量泵后从熔体入口3进入组件,经过沙腔及过滤网2形成压力稳定且无杂质的熔体,再通过喷丝板内部复杂的通道的流动,最终从喷丝板1上密布的喷丝孔喷出。
本发明使用长丝铺网工艺可使得产品中不含纤维断头,减少对皮肤的钩挂,提高触感,降低敏感。
本发明大幅提高了面膜基材的纤维细度(传统短纤1.4-1.67dtex,本发明0.2dtex左右),使面膜基材的柔软度贴肤度有了质的飞跃。
附图3所示的为普通短纤水刺布的宏观图,附图5为普通短纤水刺布的微观图。
附图5所示的为依据本发明制造的超短长丝水刺布的宏观图,附图7为依据本发明制造的超短长丝水刺布的微观图。
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (5)
1.一种超细纤维长纤无纺布的制造方法,其特征在于包括如下步骤:
步骤1,干燥PET原料和PA6原料,使得PET原料含水率降至30ppm以下,PA6原料含水率降至100ppm以下;
步骤2,干燥后的原料进入螺杆,分段逐级升温加热,使原料熔融,并排出空气,过滤异物后稳定的进入熔体管道;
步骤3,两种原料通过计量泵后进入组件,在组件内的通道内流动,最终汇集成两种原料间隔围成一圈的不止一股熔体细流,并从一个喷丝孔挤出;
步骤4,从喷丝板挤出的复合的熔体细流,在侧吹风的作用下温度逐渐冷却凝固;
步骤5,冷却过的丝束通过压缩空气填充的牵伸管,在高速风的带动下牵伸拉长变细,直至达到纺丝要求的细度;
步骤6,丝束在牵伸管出口处通过机械装置打散并均匀地铺在成网帘上,形成蓬松均匀的纤网;
步骤7,从水刺头的高压腔体***出的极细水流(高压水针)直接作用在纤网表面,将纤网表面的纤维刺入内部,在托网帘上反弹后又将反面的纤维反刺回来,使得纤维之间形成抱合缠结,将蓬松的纤网变成有强力的布;
步骤8,将PET与PA6复合而成的基布浸泡在NaOH溶液中,将PET部分溶解或全部溶解;
步骤9,稀释并清洗碱液,调节布的PH值,使之呈中性偏酸性;
步骤10,使用带针排的烘干设备,在固定布边控制门幅的条件下将产品烘干定型。
2.根据权利要求1所述的方法,其特征在于:所述步骤1的烘干操作采用经除湿处理后的热空气进行烘干。
3.根据权利要求1所述的方法,其特征在于:所述步骤3熔体细流的瓣数在8~32之间。
4.根据权利要求3所述的方法,其特征在于:所述步骤3熔体细流的瓣数为16。
5.根据权利要求1所述的方法,其特征在于:所述步骤9使用少量的冰醋酸进行PH值的调节。
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