CN110409193B - 管式无纺布及其制备方法 - Google Patents

管式无纺布及其制备方法 Download PDF

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CN110409193B
CN110409193B CN201910821001.5A CN201910821001A CN110409193B CN 110409193 B CN110409193 B CN 110409193B CN 201910821001 A CN201910821001 A CN 201910821001A CN 110409193 B CN110409193 B CN 110409193B
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刘必前
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Jiangsu Haipurun Water Treatment Equipment Co.,Ltd.
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Yancheng Hiprun Technology Co ltd
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Abstract

本发明公开了一种管式无纺布,其特征在于,包括内纤网层、中间纤网层和外纤网层,所述内纤网层、中间纤网层和外纤网层由内至外依次设置并通过水刺加固连接。通过开松、梳理、第一道水刺、第二道水刺、第三道水刺、浸渍或喷涂稀溶液及热定型的工艺制备了管式无纺布。本发明采用水刺与浸渍或涂覆稀溶液相结合的方法,提高管式无纺布层与层之间的抱合力和结合力。本发明制备的管式无纺布外径为5‑25mm,可用于制备管式膜,解决了在制备管式膜的过程中先制备管式支撑体要使用胶粘剂,支撑体的层与层之间易发生剥离而导致支撑体破坏的难题。

Description

管式无纺布及其制备方法
技术领域
本发明涉及纺织工程技术领域,具体涉及一种管式无纺布及其制备方法。
背景技术
管式膜因其具有流道宽,料液在管内湍流流动,对料液的预处理精度要求低和易于清洗等优点,被广泛地用于电泳漆涂装生产线、果汁澄清、油田回灌水的处理及污水处理等工程。
现有国内生产管式膜的工艺,都是先制作支撑管,而支撑管是由几层无纺布卷制而成,在卷制支撑管前,先在无纺布表面涂布点状热熔胶,在卷制过程中,加热无纺布,使热熔胶熔融,将几层无纺布粘结在一起,形成无纺布支撑管。然后将支撑管垂直固定,再在管中放置一锥形重锤,并加入一定量的铸膜液,使重锤匀速向上运动,铸膜液就均匀地涂布于支撑管内表面上,然后,取下膜管,放入凝固液中,经后处理后,即可浇注成膜组件。可见,管式膜是将膜附着于管状支撑体上的膜形式。而管状支撑体的性能又与无纺布本身性能及粘结剂的粘接性能有关。在实际使用管式膜的过程中会发生由于无纺布层与层剥离引起的管的破坏。
综上所述,管式膜性能与支撑管性能有关,而生产支撑管的无纺布与胶粘剂的性能对管式膜的耐压、耐水性能有很大影响,选择合适的无纺布和胶粘剂对生产合格的管式膜产品非常重要。
支撑管给制备管式膜带来了很多的工作量,还未见一种管式无纺布,能够直接用来在其内表面涂覆制备管式膜,简化管式膜的工序,提高管式膜的性能。
发明内容
本发明的目的是提供一种管式无纺布,以其来制备管式膜,简化管式膜的制备步骤,提高管式膜的使用性能。
本发明的再一目的是提供一种管式无纺布的制备方法。
为实现上述目的,本发明提供了一种管式无纺布,包括内纤网层、中间纤网层和外纤网层,所述内纤网层、中间纤网层和外纤网层由内至外依次设置并通过水刺加固连接。
所述内纤网层为聚乙烯醇纤维、聚丙烯腈纤维、聚酰胺纤维、粘胶纤维、木质素纤维或涤纶超细纤维中的一种或两种的混合物。
所述中间纤网层为涤纶纤维或丙纶纤维中的一种。
所述外纤网层为涤纶纤维或丙纶纤维中的一种。
所述内纤网层平方克重占总平方克重的40~50%,所述中间纤网层平方克重占总平方克重的30~40%,所述外纤网层平方克重占总平方克重的10~30%。
所述聚乙烯醇纤维的线密度为1~8dtex,长度为15~50mm。
所述聚丙烯腈纤维的线密度为1~6dtex,长度为10~40mm。
所述聚酰胺纤维的线密度为1~20dtex,长度为20~60mm。
所述粘胶纤维的线密度为1~8dtex,长度为20~50mm。
所述木质素纤维的长度为1~6mm。
所述涤纶超细纤维的线密度≤0.3dtex,长度为10~50mm。
所述涤纶纤维的线密度为1~30dtex,长度为15~60mm。
所述丙纶纤维的线密度为1.5~20dtex,长度为10~50mm。
所述管式无纺布的直径为5~25mm,平方克重为80~350g/m2
为实现上述目的,本发明提供了一种管式无纺布的制备方法,包括以下步骤:
1)开松、梳理:在支撑管外表面,将内纤网层纤维、中间纤网层纤维和外纤网层纤维分别进行开松、梳理成管式网状,分别得到内纤网层纤维网、中间纤网层纤维网、外纤网层纤维网;
2)第一道水刺:通过水刺机对步骤1)制得的内纤网层纤维网、中间纤网层纤维网和外纤网层纤维网的正反面进行水刺,烘干,得到初步的内纤网层水刺纤维网、中间纤网层水刺纤维网和外纤网层水刺纤维网;
3)第二道水刺:将步骤2)制得的内纤网层水刺纤维网叠放在中间纤网层水刺纤维网的内侧,得到第一复合纤网层水刺纤维网,通过水刺机对第一复合纤网层水刺纤维网正反面进行水刺处理,再烘干,得到第一复合水刺纤维网基布;
4)第三道水刺:将步骤3)制得的第一复合水刺纤维网基布叠放在步骤2)制得的外纤网层水刺纤维网内侧,得到第二复合纤网层水刺纤维网,通过水刺机对第二复合纤网层水刺纤维网正反面进行水刺处理,再烘干,得到管式水刺纤维网基布;
5)浸渍处理:将步骤4)制得的管式水刺纤维网基布浸渍或者涂覆稀溶液,再烘干,得到管式水刺无纺布基布;
6)热定型处理:将步骤5)制得的管式水刺无纺布基布经热定型而制得管式无纺布。
所述步骤1)中支撑管为管式涤纶网,所述管式涤纶网直径为5~25mm。
所述步骤1)中内纤网层纤维为聚乙烯醇纤维、聚丙烯腈纤维、聚酰胺纤维、粘胶纤维、木质素纤维或涤纶超细纤维中的一种或两种的混合物。
所述步骤1)中中间纤网层纤维为涤纶纤维或丙纶纤维中的一种。
所述步骤1)中外纤网层纤维为涤纶纤维或丙纶纤维中的一种。
所述步骤2)中第一道水刺处理的工艺为:经过五个微细水流喷刺作用,将纤维穿刺缠结,得到初步的纤网层水刺纤维网;其中,水刺抽吸的负压为5~10kPa,第一个微细水流喷刺作用的水压为2~4MPa,第二个微细水流喷刺作用的水压为5~7MPa,第三个微细水流喷刺作用的水压为3~6MPa,第四个微细水流喷刺作用的水压为7~9MPa,第五个微细水流喷刺作用的水压为2~4MPa。
所述步骤3)中第二道水刺处理的工艺为:经过七个微细水流喷刺作用,将纤维网穿刺缠结,得到第一复合水刺纤维网基布;其中,水刺抽吸的负压为6~12kPa,第一个微细水流喷刺作用的水压为4~6MPa,第二个微细水流喷刺作用的水压为7~10MPa,第三个微细水流喷刺作用的水压为11~13MPa,第四个微细水流喷刺作用的水压为8~10MPa,第五个微细水流喷刺作用的水压为11~13MPa,第六个微细水流喷刺作用的水压为7~10MPa,第七个微细水流喷刺作用的水压为4~6MPa。
所述步骤4)中第三道水刺处理的工艺为:经过七个微细水流喷刺作用,将纤维网穿刺缠结,得到第二复合水刺纤维网基布;其中,水刺抽吸的负压为8~15kPa,第一个微细水流喷刺作用的水压为5~8MPa,第二个微细水流喷刺作用的水压为9~12MPa,第三个微细水流喷刺作用的水压为12~15MPa,第四个微细水流喷刺作用的水压为9~12MPa,第五个微细水流喷刺作用的水压为12~15MPa,第六个微细水流喷刺作用的水压为8~10MPa,第七个微细水流喷刺作用的水压为4~6MPa。
所述步骤2)中烘干温度为120~150℃,时间为200~300s。
所述步骤3)中烘干温度为120~150℃,时间为200~300s。
所述步骤4)中烘干温度为120~150℃,时间为200~300s。
所述步骤5)中稀溶液的配方为:质量浓度为1~10%高分子聚合物和质量浓度为90~99%溶剂;所述高分子聚合物为聚偏氟乙烯、聚醚砜、聚砜、聚丙烯腈或聚氯乙烯中的一种;所述溶剂为N,N-二甲基甲酰胺、N,N-二甲基乙酰胺、二甲基亚砜或N-甲基吡咯烷酮中的一种。
所述步骤5)中烘干温度为80~150℃,时间为5~30min。
所述步骤6)中热定型温度为150~180℃,速度为60~90m/min。
本发明与现有技术相比,具有如下优势:
1)本发明制备的管式无纺布外径为5-25mm,可用于制备管式膜,解决了在制备管式膜的过程中先制备管式支撑体要使用胶粘剂,支撑体的层与层之间易发生剥离而导致支撑体破坏的难题。
2)本发明使用水刺与浸渍或涂覆铸膜液相结合的方法,提高管式无纺布层与层之间的抱合力和结合力。
3)本发明制备的管式无纺布由内纤网层、中间纤网层和外纤网层组成,使用聚乙烯醇纤维、聚丙烯腈纤维、聚酰胺纤维、粘胶纤维、木质素纤维或涤纶超细纤维作为内纤网层材料,利用这些亲水性纤维或者比表面积大的纤维提高管式无纺布内表面与铸膜液之间的抱合力和结合力,便于制备管式膜。
4)使用稀溶液浸渍或者涂覆管式水刺纤维网基布,提高内纤网层、中间纤网层和外纤网层的层与层之间的抱合力和结合力,提高成品管式无纺布的物理性能;同时,由于稀溶液在内纤网层、中间纤网层和外纤网层的层与层之间成膜,若用该成品管式无纺布来制备管式膜时,能提高管式无纺布与管式膜铸膜液之间的抱合力和结合力。
附图说明
图1是本发明制备的管式无纺布的截面图。
其中:1—内纤网层;2—中间纤网层;3—外纤网层。
下面结合附图对本发明作进一步的描述。
实施例1
1)开松、梳理:在直径为25mm管式涤纶网外表面上,按照质量比为4:3:3的比例分别称取内纤网层纤维、中间纤网层纤维和外纤网层纤维,将内纤网层纤维(聚乙烯醇纤维,线密度为5dtex,长度为20mm)、中间纤网层纤维(涤纶纤维,线密度为6dtex,长度为30mm)和外纤网层纤维(丙纶纤维,线密度为10dtex,长度为50mm)分别进行开松、梳理成管式网状,分别得到内纤网层纤维网、中间纤网层纤维网、外纤网层纤维网;
2)第一道水刺:通过水刺机对步骤1)制得的内纤网层纤维网、中间纤网层纤维网和外纤网层纤维网的正反面进行水刺(水刺抽吸的负压为5kPa,五个微细水流喷刺作用的水压分别为2MPa,5MPa,3MPa,7MPa,2MPa),烘干(150℃,200s),得到初步的内纤网层水刺纤维网、中间纤网层水刺纤维网和外纤网层水刺纤维网;
3)第二道水刺:将步骤2)制得的内纤网层水刺纤维网叠放在中间纤网层水刺纤维网的内侧,得到第一复合纤网层水刺纤维网,通过水刺机对第一复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为6kPa,七个微细水流喷刺作用的水压分别为4MPa,7MPa,11MPa,8MPa,11MPa,7MPa,4MPa),再烘干(120℃,300s),得到第一复合水刺纤维网基布;
4)第三道水刺:将步骤3)制得的第一复合水刺纤维网基布叠放在步骤2)制得的外纤网层水刺纤维网内侧,得到第二复合纤网层水刺纤维网,通过水刺机对第二复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为8kPa,七个微细水流喷刺作用的水压分别为5MPa,9MPa,12MPa,9MPa,12MPa,8MPa,4MPa),再烘干(130℃,270s),得到管式水刺纤维网基布;
5)浸渍处理:将步骤4)制得的管式水刺纤维网基布浸渍稀溶液(质量浓度为2%PVDF和质量浓度为98%N,N-二甲基乙酰胺混合溶液),再烘干(80℃,30min),得到管式水刺无纺布基布;
6)热定型处理:将步骤5)制得的管式水刺无纺布基布经热定型(温度为150℃,速度为90m/min)而制得管式无纺布,该管式无纺布的直径为25mm,平方克重为350g/m2
实施例2
1)开松、梳理:在直径为12mm管式涤纶网外表面上,按照质量比为4:4:2的比例分别称取内纤网层纤维、中间纤网层纤维和外纤网层纤维,将内纤网层纤维(聚丙烯腈纤维,线密度为4dtex,长度为40mm)、中间纤网层纤维(丙纶纤维,线密度为6dtex,长度为30mm)和外纤网层纤维(涤纶纤维,线密度为3dtex,长度为40mm)分别进行开松、梳理成管式网状,分别得到内纤网层纤维网、中间纤网层纤维网、外纤网层纤维网;
2)第一道水刺:通过水刺机对步骤1)制得的内纤网层纤维网、中间纤网层纤维网和外纤网层纤维网的正反面进行水刺(水刺抽吸的负压为10kPa,五个微细水流喷刺作用的水压分别为4MPa,7MPa,6MPa,9MPa,4MPa),烘干(140℃,250s),得到初步的内纤网层水刺纤维网、中间纤网层水刺纤维网和外纤网层水刺纤维网;
3)第二道水刺:将步骤2)制得的内纤网层水刺纤维网叠放在中间纤网层水刺纤维网的内侧,得到第一复合纤网层水刺纤维网,通过水刺机对第一复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为12kPa,七个微细水流喷刺作用的水压分别为6MPa,10MPa,13MPa,10MPa,13MPa,10MPa,6MPa),再烘干(120℃,300s),得到第一复合水刺纤维网基布;
4)第三道水刺:将步骤3)制得的第一复合水刺纤维网基布叠放在步骤2)制得的外纤网层水刺纤维网内侧,得到第二复合纤网层水刺纤维网,通过水刺机对第二复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为15kPa,七个微细水流喷刺作用的水压分别为8MPa,12MPa,15MPa,12MPa,15MPa,10MPa,4MPa),再烘干(150℃,200s),得到管式水刺纤维网基布;
5)浸渍处理:将步骤4)制得的管式水刺纤维网基布涂覆稀溶液(质量浓度为10%聚醚砜和质量浓度为90%N,N-二甲基甲酰胺混合溶液),再烘干(120℃,20min),得到管式水刺无纺布基布;
6)热定型处理:将步骤5)制得的管式水刺无纺布基布经热定型(温度为180℃,速度为60m/min)而制得管式无纺布,该管式无纺布的直径为12mm,平方克重为200g/m2
实施例3
1)开松、梳理:在直径为5mm管式涤纶网外表面上,按照质量比为5:4:1的比例分别称取内纤网层纤维、中间纤网层纤维和外纤网层纤维,将内纤网层纤维(涤纶超细纤维,线密度为0.3dtex,长度为10mm)、中间纤网层纤维(涤纶纤维,线密度为10dtex,长度为40mm)和外纤网层纤维(丙纶纤维,线密度为12dtex,长度为40mm)分别进行开松、梳理成管式网状,分别得到内纤网层纤维网、中间纤网层纤维网、外纤网层纤维网;
2)第一道水刺:通过水刺机对步骤1)制得的内纤网层纤维网、中间纤网层纤维网和外纤网层纤维网的正反面进行水刺(水刺抽吸的负压为8kPa,五个微细水流喷刺作用的水压分别为3MPa,6MPa,5MPa,8MPa,3MPa),烘干(150℃,200s),得到初步的内纤网层水刺纤维网、中间纤网层水刺纤维网和外纤网层水刺纤维网;
3)第二道水刺:将步骤2)制得的内纤网层水刺纤维网叠放在中间纤网层水刺纤维网的内侧,得到第一复合纤网层水刺纤维网,通过水刺机对第一复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为10kPa,七个微细水流喷刺作用的水压分别为5MPa,8MPa,12MPa,9MPa,12MPa,8MPa,5MPa),再烘干(140℃,250s),得到第一复合水刺纤维网基布;
4)第三道水刺:将步骤3)制得的第一复合水刺纤维网基布叠放在步骤2)制得的外纤网层水刺纤维网内侧,得到第二复合纤网层水刺纤维网,通过水刺机对第二复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为12kPa,七个微细水流喷刺作用的水压分别为6MPa,10MPa,13MPa,11MPa,14MPa,9MPa,5MPa),再烘干(130℃,270s),得到管式水刺纤维网基布;
5)浸渍处理:将步骤4)制得的管式水刺纤维网基布浸渍稀溶液(质量浓度为7%聚砜和质量浓度为93%N,N-二甲基乙酰胺混合溶液),再烘干(100℃,25min),得到管式水刺无纺布基布;
6)热定型处理:将步骤5)制得的管式水刺无纺布基布经热定型(温度为160℃,速度为70m/min)而制得管式无纺布,该管式无纺布的直径为5mm,平方克重为80g/m2
实施例4
1)开松、梳理:在直径为18mm管式涤纶网外表面上,按照质量比为4:3:3的比例分别称取内纤网层纤维、中间纤网层纤维和外纤网层纤维,将内纤网层纤维(粘胶纤维,线密度为8dtex,长度为40mm)、中间纤网层纤维(丙纶纤维,线密度为1.5dtex,长度为30mm)和外纤网层纤维(涤纶纤维,线密度为8dtex,长度为30mm)分别进行开松、梳理成管式网状,分别得到内纤网层纤维网、中间纤网层纤维网、外纤网层纤维网;
2)第一道水刺:通过水刺机对步骤1)制得的内纤网层纤维网、中间纤网层纤维网和外纤网层纤维网的正反面进行水刺(水刺抽吸的负压为9kPa,五个微细水流喷刺作用的水压分别为3MPa,7MPa,4MPa,6MPa,3MPa),烘干(140℃,250s),得到初步的内纤网层水刺纤维网、中间纤网层水刺纤维网和外纤网层水刺纤维网;
3)第二道水刺:将步骤2)制得的内纤网层水刺纤维网叠放在中间纤网层水刺纤维网的内侧,得到第一复合纤网层水刺纤维网,通过水刺机对第一复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为8kPa,七个微细水流喷刺作用的水压分别为5MPa,9MPa,12MPa,10MPa,13MPa,9MPa,4MPa),再烘干(150℃,200s),得到第一复合水刺纤维网基布;
4)第三道水刺:将步骤3)制得的第一复合水刺纤维网基布叠放在步骤2)制得的外纤网层水刺纤维网内侧,得到第二复合纤网层水刺纤维网,通过水刺机对第二复合纤网层水刺纤维网正反面进行水刺处理(水刺抽吸的负压为10kPa,七个微细水流喷刺作用的水压分别为7MPa,11MPa,14MPa,10MPa,13MPa,9MPa,5MPa),再烘干(120℃,300s),得到管式水刺纤维网基布;
5)浸渍处理:将步骤4)制得的管式水刺纤维网基布涂覆稀溶液(质量浓度为4%聚丙烯腈和质量浓度为96%N-甲基吡咯烷酮混合溶液),再烘干(150℃,5min),得到管式水刺无纺布基布;
6)热定型处理:将步骤5)制得的管式水刺无纺布基布经热定型(温度为170℃,速度为80m/min)而制得管式无纺布,该管式无纺布的直径为18mm,平方克重为150g/m2

Claims (11)

1.一种管式无纺布,其特征在于,包括内纤网层、中间纤网层和外纤网层,所述内纤网层、中间纤网层和外纤网层由内至外依次设置并通过水刺加固连接;
所述管式无纺布的制备方法,包括以下步骤:
1)开松、梳理:在支撑管外表面,将内纤网层纤维、中间纤网层纤维和外纤网层纤维分别进行开松、梳理成管式网状,分别得到内纤网层纤维网、中间纤网层纤维网、外纤网层纤维网;
2)第一道水刺:通过水刺机对步骤1)制得的内纤网层纤维网、中间纤网层纤维网和外纤网层纤维网的正反面进行水刺,烘干,得到初步的内纤网层水刺纤维网、中间纤网层水刺纤维网和外纤网层水刺纤维网;
3)第二道水刺:将步骤2)制得的内纤网层水刺纤维网叠放在中间纤网层水刺纤维网的内侧,得到第一复合纤网层水刺纤维网,通过水刺机对第一复合纤网层水刺纤维网正反面进行水刺处理,再烘干,得到第一复合水刺纤维网基布;
4)第三道水刺:将步骤3)制得的第一复合水刺纤维网基布叠放在步骤2)制得的外纤网层水刺纤维网内侧,得到第二复合纤网层水刺纤维网,通过水刺机对第二复合纤网层水刺纤维网正反面进行水刺处理,再烘干,得到管式水刺纤维网基布;
5)浸渍处理:将步骤4)制得的管式水刺纤维网基布浸渍或者涂覆稀溶液,再烘干,得到管式水刺无纺布基布;
所述稀溶液的配方为:质量浓度为1~10%的高分子聚合物和质量浓度为90~99%溶剂;
所述高分子聚合物为聚偏氟乙烯、聚醚砜、聚砜、聚丙烯腈或聚氯乙烯中的一种;所述溶剂为N,N-二甲基甲酰胺、N,N-二甲基乙酰胺、二甲基亚砜或N-甲基吡咯烷酮中的一种;
6)热定型处理:将步骤5)制得的管式水刺无纺布基布经热定型而制得管式无纺布。
2.根据权利要求1所述的管式无纺布,其特征在于,所述管式无纺布的直径为5~25mm,平方克重为80~350g/m2,所述内纤网层平方克重占总平方克重的40~50%,所述中间纤网层平方克重占总平方克重的30~40%,所述外纤网层平方克重占总平方克重的10~30%。
3.根据权利要求1所述的管式无纺布,其特征在于,所述内纤网层为聚乙烯醇纤维、聚丙烯腈纤维、聚酰胺纤维、粘胶纤维、木质素纤维或涤纶超细纤维中的一种或两种的混合物;所述中间纤网层为涤纶纤维或丙纶纤维中的一种;所述外纤网层为涤纶纤维或丙纶纤维中的一种。
4.根据权利要求3所述的管式无纺布,其特征在于,所述聚乙烯醇纤维的线密度为1~8dtex,长度为15~50mm;所述聚丙烯腈纤维的线密度为1~6dtex,长度为10~40mm;所述聚酰胺纤维的线密度为1~20dtex,长度为20~60mm;所述粘胶纤维的线密度为1~8dtex,长度为20~50mm;所述木质素纤维的长度为1~6mm;所述涤纶超细纤维的线密度≤0.3dtex,长度为10~50mm;所述涤纶纤维的线密度为1~30dtex,长度为15~60mm;所述丙纶纤维的线密度为1.5~20dtex,长度为10~50mm。
5.根据权利要求1所述的管式无纺布,其特征在于,所述步骤1)中支撑管为管式涤纶网,所述管式涤纶网直径为5~25mm。
6.根据权利要求1所述的管式无纺布,其特征在于,所述步骤2)中第一道水刺处理的工艺为:经过五个微细水流喷刺作用,将纤维穿刺缠结,得到初步的纤网层水刺纤维网;其中,水刺抽吸的负压为5~10kPa,第一个微细水流喷刺作用的水压为2~4MPa,第二个微细水流喷刺作用的水压为5~7MPa,第三个微细水流喷刺作用的水压为3~6MPa,第四个微细水流喷刺作用的水压为7~9MPa,第五个微细水流喷刺作用的水压为2~4MPa;所述步骤2)中烘干温度为120~150℃,时间为200~300s。
7.根据权利要求1所述的管式无纺布,其特征在于,所述步骤3)中第二道水刺处理的工艺为:经过七个微细水流喷刺作用,将纤维网穿刺缠结,得到第一复合水刺纤维网基布;其中,水刺抽吸的负压为6~12kPa,第一个微细水流喷刺作用的水压为4~6MPa,第二个微细水流喷刺作用的水压为7~10MPa,第三个微细水流喷刺作用的水压为11~13MPa,第四个微细水流喷刺作用的水压为8~10MPa,第五个微细水流喷刺作用的水压为11~13MPa,第六个微细水流喷刺作用的水压为7~10MPa,第七个微细水流喷刺作用的水压为4~6MPa;所述步骤3)中烘干温度为120~150℃,时间为200~300s。
8.根据权利要求1所述的管式无纺布,其特征在于,所述步骤4)中第三道水刺处理的工艺为:经过七个微细水流喷刺作用,将纤维网穿刺缠结,得到第二复合水刺纤维网基布;其中,水刺抽吸的负压为8~15kPa,第一个微细水流喷刺作用的水压为5~8MPa,第二个微细水流喷刺作用的水压为9~12MPa,第三个微细水流喷刺作用的水压为12~15MPa,第四个微细水流喷刺作用的水压为9~12MPa,第五个微细水流喷刺作用的水压为12~15MPa,第六个微细水流喷刺作用的水压为8~10MPa,第七个微细水流喷刺作用的水压为4~6MPa;所述步骤4)中烘干温度为120~150℃,时间为200~300s。
9.根据权利要求1所述的管式无纺布,其特征在于,所述步骤5)中烘干温度为80~150℃,时间为5~30min。
10.根据权利要求1所述的管式无纺布,其特征在于,所述步骤6)中热定型温度为150~180℃,速度为60~90m/min。
11.根据权利要求1~10任一项所述的管式无纺布在制备管式膜中的应用。
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