CN110670240B - 一种可使液体快速下渗并抑制回渗的无纺布及其制备方法 - Google Patents

一种可使液体快速下渗并抑制回渗的无纺布及其制备方法 Download PDF

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CN110670240B
CN110670240B CN201911051405.7A CN201911051405A CN110670240B CN 110670240 B CN110670240 B CN 110670240B CN 201911051405 A CN201911051405 A CN 201911051405A CN 110670240 B CN110670240 B CN 110670240B
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黄晨
邱雪宁
邓霁霞
靳向煜
吴海波
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    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
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    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
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Abstract

本发明公开了一种可使液体快速下渗并抑制回渗的无纺布,其特征在于,包括上层无纺布和下层无纺布,上层无纺布的面密度不小于35g/m2,下层无纺布的面密度范围为20‑40g/m2。制备方法为:ES单亲纤维通过非织造梳理成网及交叉铺网工艺,制成纤维网A;ES多亲纤维通过非织造直接铺网工艺,制成纤维网B;将纤维网A放置在纤维网B的上方,通过针刺或热轧粘合工艺进行加固复合。初始状态下,无纺布呈亲水,可保证液体快速下渗,当液体穿透无纺布后,因单亲纤维的亲水油剂被液体冲洗脱落,该层纤维网从亲水变为疏水,而多亲纤维仍维持亲水状态,此时,上方的疏水层可有效防止液体在受压等情况下发生回渗,保证了上层的干爽。

Description

一种可使液体快速下渗并抑制回渗的无纺布及其制备方法
技术领域
本发明涉及一种可使液体下渗快并抑制回渗无纺布及其制备方法,直接采用ES单亲纤维和ES多亲纤维进行制备,未涉及任何化学后整理工艺,制备工艺安全无污染,所生产的可使液体下渗快并抑制回渗的无纺布液体下渗速度快,抗返渗效果好,液体穿透后,表面干爽舒适,可应用于一次性卫生用品如纸尿裤,卫生巾中。
背景技术
现有的一次性卫生用品如纸尿裤、卫生巾等,满足吸水性良好、可使液体快速下渗的条件时,却易造成返渗的问题;满足抑制回渗效果好的条件时,却产生吸水性差、液体下渗速度慢的问题,市场上现有的产品无法实现同时满足液体快速下渗和抑制回渗两种使用条件,在使用过程中表面无法保持干爽,对人体的使用舒适性造成一定影响。
一种现有技术如公告日为2017年7月18日,公告号为CN106958077A,名为《纯棉单向导湿无纺布制备工艺与单向导湿棉尿裤、卫生巾》的中国专利,公开了一种纯棉单向导湿无纺布制备工艺,将亲水性棉网与拒水性网眼水刺无纺布通过水刺复合,使得两者纤维相互缠结抱合,形成具有单项导湿效果的无纺布。一种现有技术如公告日为2018年1月9日,公告号为CN201710607833.8,名为《透气干爽无纺布及其生产方法》的中国专利,公开了一种水穿透性好、回渗量少的透气干爽无纺布,将两种材料的无纺布进行复合,其上层无纺布为克重为20 30克每平方米的ES多亲无纺布,下层无纺布为克重为12 18克每平方米的ES单亲无纺布。
发明内容
本发明所要解决的技术问题是:提供一种结构简单、工艺流程短、安全舒适、液体穿透后,表面干爽舒适,可使液体下渗快并抑制回渗的无纺布。
为了解决上述问题,本发明提供了一种可使液体快速下渗并抑制回渗的无纺布,其特征在于,包括上层无纺布和下层无纺布,上层无纺布的面密度不小于35g/m2,下层无纺布的面密度范围为20-40g/m2
优选地,所述的上层无纺布的纤维原料是ES单次亲水纤维,即ES单亲纤维;所述的下层无纺布的纤维原料是ES多次亲水纤维,即ES多亲纤维。
优选地,所述的ES单亲纤维由ES纤维经过单次亲水油剂处理制得。
优选地,所述的ES单亲纤维为皮芯结构的热熔纤维,其皮层为聚乙烯,芯层为聚酯;所述的ES多亲纤维为皮芯结构的热熔纤维,其皮层为聚乙烯,芯层为聚酯或聚丙烯。
本发明还提供了上述可使液体下渗快并抑制回渗的无纺布的制备方法,其特征在于,包括以下步骤:
第一步:准备ES单亲纤维,称取所需质量的ES单亲纤维,通过非织造梳理成网及交叉铺网工艺,制成面密度不小于35/m2的纤维网A;
第二步:准备ES多亲纤维,称取所需质量的ES多亲纤维,通过非织造直接铺网工艺,制成面密度为20-40g/m2的纤维网B;
第三步:将纤维网A放置在纤维网B的上方,使两者相互复合;
第四步:通过针刺或热轧粘合工艺,对复合的纤维网进行加固复合,得到可使液体快速下渗并抑制回渗的无纺布。
优选地,所述第一步获得的纤维网A中纤维排列具有随机性;第二步获得的纤维网B复合前用牵伸机进行牵伸,其中的纤维沿机器的方向取向排列。
优选地,所述第三步中复合前,先对纤维网B进行水刺,对纤维网A进行针刺,使这两层纤维网在复合前具有一定的初始强力和结构稳定性,再将纤维网A与纤维网B复合。
初始状态下,所制备无纺布呈亲水,可保证液体快速下渗,当液体穿透无纺布后,因单亲纤维的亲水油剂被液体冲洗脱落,该层纤维网从亲水逐渐变为疏水,而多亲纤维仍维持亲水状态,此时,无纺布具有抑制回渗作用,上方的疏水层可有效防止液体在受压等情况下发生回渗,从而保证了上层的干爽。
与现有技术相比,本发明的有益效果是:本发明采用ES单亲纤维和ES多亲纤维为原料,初始状态下,所制备无纺布呈亲水,可保证液体快速下渗,当液体穿透无纺布后,因单亲纤维的亲水油剂被液体冲洗脱落,该层纤维网从亲水变为疏水,而多亲纤维仍维持亲水状态,此时,无纺布具有抑制回渗作用,上方的疏水层可有效防止液体在受压等情况下发生回渗,保证了上层的干爽。本发明成网工艺和加固工艺多变,生产方法不绝对,可根据现有设备进行灵活调整。
附图说明
图1为本发明提供的可使液体快速下渗并抑制回渗的无纺布的结构示意图。
具体实施方式
为使本发明更明显易懂,兹以优选实施例,并配合附图作详细说明如下。
实施例1
如图1所示,为本实施例的可使液体下渗快并抑制回渗的无纺布,由上层无纺布1和下层无纺布2构成,所述的上层无纺布1由ES单亲纤维通过非织造梳理成网及交叉铺网工艺制备,上层无纺布1具有高度随机性,液体可沿无纺布表面各个方向进行下渗,下渗速度快。所述的下层无纺布2由ES多亲纤维通过非织造直接铺网工艺制备,再用牵伸机进行牵伸,获得下层无纺布2,其中的纤维沿机器的方向取向排列,形成定向导水,液体到达下层在水平面上沿机器的方向流动,有助于更好的导流和分散。
上述的可使液体下渗快并抑制回渗的无纺布的制备方法为:
第一步:准备ES单亲纤维,称取所需质量的ES单亲纤维,通过非织造梳理成网及交叉铺网工艺,制成面密度为40g/m2的纤维网A;
第二步:准备ES多亲纤维,称取所需质量的ES多亲纤维,通过非织造直接铺网工艺制成纤维网B,再对纤维网B在压力为5N的条件下进行拉伸,提高机器方向的纤维取向度;拉伸后,纤网伸长至原长度的1.3倍;制成面密度为30g/m2的纤维网B;
第三步:将纤维网A和纤维网B通过平行铺网复合,将纤维网A放置在纤维网B的上方,得到复合纤维网;
第四步:对复合纤维网进行针刺加固,将复合纤维网置于针刺机的输网帘上,进行一道预针刺,两道正面针刺和两道反面针刺。在刺针和剥网板的共同作用下,纤网中的纤维发生位移、穿插,使上下两层纤网中的纤维相互缠结抱合,同时也使ES单亲纤维与ES多亲纤维相互缠结抱合,上下两层纤网紧密缠结,成为一体;将所得复合无纺布进行卷绕。
实施例2
一种可使液体快速下渗并抑制回渗的无纺布的制备方法:
第一步:准备ES单亲纤维,称取所需质量的ES单亲纤维,通过非织造梳理成网及交叉铺网工艺,制成面密度为40g/m2的纤维网A;
第二步:准备ES多亲纤维,称取所需质量的ES多亲纤维,通过非织造直接铺网工艺,再对纤维网B在压力为5N的条件下进行拉伸,提高机器方向的纤维取向度;拉伸后,纤网伸长至原长度的1.3倍;制成面密度为30g/m2的纤维网B;
第三步:将纤维网A和纤维网B通过平行铺网复合,将纤维网A放置在纤维网B的上方,得到复合的纤维网;
第四步:对复合纤维网进行热轧粘合加固,将复合纤维网喂入热轧机,轧辊温度为130℃,纤网在轧辊的温度、压力和纤维之间变形热的作用下,ES单亲纤维和ES多亲纤维皮层的聚乙烯发生熔融,而ES单亲纤维和ES多亲纤维的芯层还未达到熔点,不发生熔融,当离开热轧辊,在室温冷却下,两种纤维的皮层聚乙烯又重新固化,形成新的粘合点,纤维与纤维之间发生了紧密的粘合,纤网得到了加固,两种纤网融为一体;将所得复合无纺布进行卷绕。
实施例3
一种可使液体下渗快并抑制回渗的无纺布的制备方法:
第一步:准备ES单亲纤维,称取所需质量的ES单亲纤维,通过非织造梳理成网及交叉铺网工艺,制成面密度为40g/m2的纤维网A;
第二步:准备ES多亲纤维,称取所需质量的ES多亲纤维,通过非织造直接铺网工艺,再对纤维网B在压力为5N的条件下进行拉伸,提高所述的机器方向的纤维取向度;拉伸后,纤网伸长至原长度的1.3倍;制成面密度为30g/m2的纤维网B;
第三步:对纤维网A进行针刺加固,赋予纤维网A一定强力,采用预针刺一道,正面针刺一道和反面针刺一道,得到上层无纺布1;
第四步:对纤维网B进行水刺加固,赋予纤维网B一定强力,采用预水刺一道,正面水刺一道和反面水刺一道,得到下层无纺布2。
第五步:将第四步所得的下层无纺布2烘干后,与第三步所得的上层无纺布1进行复合,上层无纺布1置于下层无纺布2上层,得到复合无纺布,将复合无纺布喂入针刺机,进行正面针刺两道,反面针刺两道。所制得的无纺布,上下两层纤网中的纤维发生位移、穿插,使上下两层纤网中的纤维相互缠结抱合,同时也使ES单亲纤维与ES多亲纤维相互缠结抱合,上下两层纤网紧密缠结,成为一体。将所得复合无纺布进行卷绕。

Claims (1)

1.一种可使液体快速下渗并抑制回渗的无纺布,其特征在于,包括上层无纺布(1)和下层无纺布(2),上层无纺布(1)的面密度不小于35g/m2,下层无纺布(2)的面密度范围为20-40g/m2;所述的上层无纺布(1)的纤维原料是ES单次亲水纤维,即ES单亲纤维;所述的下层无纺布(2)的纤维原料是ES多次亲水纤维,即ES多亲纤维;所述的ES单亲纤维为皮芯结构的热熔纤维,其皮层为聚乙烯,芯层为聚酯;所述的ES多亲纤维为皮芯结构的热熔纤维,其皮层为聚乙烯,芯层为聚酯或聚丙烯;所述的ES单亲纤维由ES纤维经过单次亲水油剂处理制得;所述的可使液体下渗快并抑制回渗的无纺布的制备方法,包括以下步骤:
第一步:准备ES单亲纤维,称取所需质量的ES单亲纤维,通过非织造梳理成网及交叉铺网工艺,制成面密度不小于35/m2的纤维网A;
第二步:准备ES多亲纤维,称取所需质量的ES多亲纤维,通过非织造直接铺网工艺,制成面密度为20-40g/m2的纤维网B;
所述第一步获得的纤维网A中纤维排列具有随机性;第二步获得的纤维网B复合前用牵伸机进行牵伸,其中的纤维沿机器的方向取向排列;
第三步:先对纤维网B进行水刺,对纤维网A进行针刺,使这两层纤维网在复合前具有一定的初始强力和结构稳定性,将纤维网A放置在纤维网B的上方,使两者相互复合;
第四步:通过针刺或热轧粘合工艺,对复合的纤维网进行加固复合,得到可使液体快速下渗并抑制回渗的无纺布。
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