CN108716027B - Hdpe-pet复合超短纤维的制备方法、应用及后纺系统 - Google Patents
Hdpe-pet复合超短纤维的制备方法、应用及后纺系统 Download PDFInfo
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Abstract
本发明提供一种HDPE‑PET复合超短纤维的制备方法,其步骤包括:HDPE经螺杆熔融后,进入纺丝箱体A;PET干燥后经螺杆熔融,进入纺丝箱体B;两种熔体通过中空喷丝板喷出,冷却固化后,上油,然后卷绕拉伸,拉伸后的丝喂入葵花轮中,烘干定型后切断成所需尺寸的超短纤维;其中中空喷丝板的喷丝孔呈四瓣。并公开了HDPE‑PET复合超短纤维在制备无尘纸中的应用。本发明的中空皮芯结构的复合超短纤维中空率可达25‑30%,比表面积增加15‑20%,热粘合性能提高,用于生产无尘纸时,比例仅需20%左右,生产成本降低,吸水性能增强。中空纤维富有较好的弹性,使无尘纸在同样单位面积重量的前提下,提高饱满度和布网弹性,大大提高卫生材料的柔软度。
Description
技术领域
本发明涉及一种HDPE-PET复合超短纤维的制备方法、应用及其后纺系统。
背景技术
超短纤维,顾名思义是长度有特殊要求的短纤维,它的长度根据不同非织造布设备及非织造布产品要求确定,一般为3-6mm;除此之外,一般用于梳理成网,也包括气流成网的非织造布用的纤维,要求有合适的抱合力,但PE/PET复合短纤维要具有良好的分散性能,更重要的是要具有良好的热熔性及粘合性能,并且要使非织造布有一定的拉力。无尘纸生产时,超短纤维的比例通常控制在26-28%才能达到热熔粘合要求。
发明内容
本发明的目的是提供一种HDPE-PET复合超短纤维的制备方法。
本发明的技术方案为:
一种HDPE-PET复合超短纤维的制备方法,其步骤包括:
(1)HDPE经螺杆熔融后,计量进入纺丝箱体A;
(2)PET干燥后经螺杆熔融,计量进入纺丝箱体B;
(3)两种熔体通过中空喷丝板喷出,形成中空的皮芯结构的丝,冷却固化后,上油,然后卷绕拉伸,拉伸后的丝喂入葵花轮中,烘干定型后切断成所需尺寸的超短纤维;
其中中空喷丝板的喷丝孔呈四瓣,制得的超短纤维中空率为25-30%。
优选的,所述喷丝孔的微孔外圆弧直径(D)为1.6mm,喷丝孔微孔内圆弧直径(d)为1.24 mm,4个对称隔断狭缝(L)为0.08mm,微孔深度0.9mm。
优选的,步骤(1)中HDPE的熔融指数为17-21g/10分钟,熔点129-134℃,熔融区最高温度为270-280℃,熔体进入纺丝箱体的温度控制在265-270℃。
优选的,步骤(2)中 PET粘度为0.62dl/g,熔点252-256℃,干燥后含水小于50PPM,熔融区最高温度为295-305℃,熔体进入纺丝箱体的温度为290-295℃。
优选的,纺丝箱体温度控制在295-300℃,冷却侧吹风风速为1.3-1.6m/s,风温为20-24℃,吹风湿度70-76%。
优选的,纺丝速度为1330m/min,原丝纤度3.88dtex,卷曲前预热温度90-94℃,拉伸速度160m/min,拉伸倍数2.76,其中一级拉伸2.4倍,二级拉伸1.15倍,拉伸油浴温度89-92℃,蒸汽102-106℃,拉伸辊:第一牵伸辊105℃,第二牵伸辊110℃,第三牵伸辊90℃,定型温度112-116℃。
所述PET与HDPE的重量比为60:40。在确保纤维物理指标强力、伸长率的基础上,PET的使用比例调整为60%,可以增加热熔量,充分提高无尘纸布网的粘合性能。
本发明还公开了HDPE-PET复合超短纤维在制备无尘纸中的应用,其中HDPE-PET复合超短纤维为中空的皮芯结构,皮层为HDPE,芯层为PET,长度为3-6mm。
本发明还公开了HDPE-PET复合超短纤维的后纺系统,包括集束架、导丝机、油槽、第一牵伸机、油浴槽、第二牵伸机、蒸汽箱、第三牵伸机、叠丝机、葵花轮、松弛热定型机、曳引张力机、切断机和打包机,丝线经集束架集束成丝束后,经导丝机指引,在油槽中浸油,然后依次经过第一牵伸机、油浴槽、第二牵伸机、蒸汽箱、第三牵伸机进行拉伸,再通过叠丝机后送入葵花轮,在葵花轮的牵引下送入松弛热定型机进行定型,在曳引张力机的牵引下送入切断机进行切断,切断后的丝束进入打包机打包;
其中所述葵花轮为两个相向转动的辊,丝束从辊中间穿过,通过辊的转动带动丝束向前运动。
本发明的有益效果如下:
无尘纸生产时,需将木浆和超短纤维按一定比例混合后,经气流成网,和热风粘合而成,其超短纤维主要是起热熔粘合作用,生产过程中使用比例越小,木浆使用比例会提高,成本降低,吸水性变好,但是为了起到热熔粘合作用,超短纤维的比例必须控制在26%以上。本发明的中空皮芯结构的复合超短纤维中空率可达25-30%,比表面积增加15-20%,热粘合性能提高,用于生产无尘纸时,比例仅需20%左右,生产成本降低,吸水性能增强。
在后纺步骤中,采用葵花轮代替卷曲机来处理纤维,中空纤维采用无卷曲纤维,可以提高纤维在纤网内的均匀性,增加分散性能。中空纤维富有较好的弹性,使无尘纸在同样单位面积重量的前提下,提高饱满度和布网弹性,大大提高卫生材料的柔软度。
附图说明
图1是中空喷丝板的微孔剖面示意图。
图2是中空喷丝板的微孔截面示意图。
图3是实施例1制得的复合超短纤维的截面图。
图4是HDPE-PET复合超短纤维的后纺系统的结构示意图。
实施方式
为了更好地理解本发明,下面用具体实例来详细说明本发明的技术方案,但是本发明并不局限于此。
实施例
本HDPE-PET复合超短纤维的制备方法,其步骤包括:
(1)HDPE经螺杆熔融后,计量进入纺丝箱体A, HDPE的熔融指数为17-21g/10分钟,熔点129-134℃,熔融区最高温度为270-280℃,熔体进入纺丝箱体的温度控制在265-270℃;
(2)PET干燥后经螺杆熔融,计量进入纺丝箱体B, PET粘度为0.62dl/g,熔点252-256℃,干燥后含水小于50PPM,熔融区最高温度为295-305℃,熔体进入纺丝箱体的温度为290-295℃,PET与HDPE的重量比为60:40;
(3)两种熔体通过中空喷丝板喷出,形成中空的皮芯结构的丝,冷却固化后,上油,然后卷绕拉伸,拉伸后的丝喂入葵花轮中,烘干定型后切断成所需尺寸的超短纤维;纺丝箱体温度控制在295-300℃,冷却侧吹风风速为1.3-1.6m/s,风温为20-24℃,吹风湿度70-76%;纺丝速度为1330m/min,原丝纤度3.88dtex,卷曲前预热温度90-94℃,拉伸速度160m/min,拉伸倍数2.76,其中一级拉伸2.4倍,二级拉伸1.15倍,拉伸油浴温度89-92℃,蒸汽102-106℃,拉伸辊:第一牵伸辊105℃,第二牵伸辊110℃,第三牵伸辊90℃,定型温度112-116℃
如图1和图2所示,其中中空喷丝板的喷丝孔呈四瓣,喷丝孔的微孔1外圆弧直径(D)为1.6mm,喷丝孔微孔内圆弧直径(d)为1.24 mm,4个对称隔断狭缝(L)为0.08mm,微孔深度0.9mm,制得的超短纤维结构如图3所示,中空率为25-30%。
制得的超短纤维纤度1.7dtex±6%,强力3.0-3.5CN/dtex,伸长52-60%,中空率为25-30%,比表面积相对实心的超短纤维增加15-20%,无卷曲,切断长度3-6mm。
实施例
如图4所示,本HDPE-PET复合超短纤维的后纺系统,包括集束架1、导丝机2、油槽3、第一牵伸机4、油浴槽5、第二牵伸机6、蒸汽箱7、第三牵伸机8、叠丝机9、葵花轮10、松弛热定型机11、曳引张力机12、切断机13和打包机14,丝线经集束架1集束成丝束后,经导丝机2指引,在油槽3中浸油,然后依次经过第一牵伸机4、油浴槽5、第二牵伸机6、蒸汽箱7、第三牵伸机8进行拉伸,再通过叠丝机9后送入葵花轮10,在葵花轮的牵引下送入松弛热定型机11进行定型,在曳引张力机12的牵引下送入切断机13进行切断,切断后的丝束进入打包机14打包;
其中所述葵花轮为两个相向转动的辊,丝束从辊中间穿过,通过辊的转动带动丝束向前运动。
Claims (5)
1.一种用于无尘纸的HDPE-PET复合超短纤维的制备方法,其特征在于: 其步骤包括:
(1)HDPE经螺杆熔融后,计量进入纺丝箱体A;HDPE的熔融指数为17-21g/10分钟,熔点129-134℃,熔融区最高温度为270-280℃,熔体进入纺丝箱体的温度控制在265-270℃;
(2)PET干燥后经螺杆熔融,计量进入纺丝箱体B;PET粘度为0.62dl/g,熔点252-256℃,干燥后含水小于50PPM,熔融区最高温度为295-305℃,熔体进入纺丝箱体的温度为290-295℃;
(3)两种熔体通过复合中空喷丝板喷出,形成中空的皮芯结构的丝条,经冷却固化、上油、卷绕落入存丝桶平衡;然后,集束、拉伸送入葵花轮,经烘干定型,切断成所需尺寸的超短纤维;
其中中空喷丝板的喷丝孔呈四瓣,制得的超短纤维中空率为25-30%;所述超短纤维为无卷曲纤维;
HDPE-PET复合超短纤维为中空的皮芯结构,皮层为HDPE,芯层为PET,所述PET与HDPE的重量比为60:40;
其中所述葵花轮为两个相向转动的辊,丝束从辊中间穿过,通过辊的转动带动丝束向前运动;采用葵花轮代替卷曲机来处理纤维,中空纤维为无卷曲纤维,以提高纤维在纤网内的均匀性,增加分散性能。
2.根据权利要求1所述的HDPE-PET复合超短纤维的制备方法,其特征在于: 所述喷丝孔的微孔外圆弧直径(D)为1.6mm,喷丝孔微孔内圆弧直径(d)为1.24 mm,4个对称隔断狭缝(L)为0.08mm,微孔深度0.9mm。
3.根据权利要求1所述的HDPE-PET复合超短纤维的制备方法,其特征在于: 纺丝箱体温度控制在295-300℃,冷却侧吹风风速为1.3-1.6m/s,风温为20-24℃,吹风湿度70-76%。
4.根据权利要求3所述的HDPE-PET复合超短纤维的制备方法,其特征在于: 纺丝速度为1330m/min,原丝纤度3.88dtex,卷曲前预热温度90-94℃,拉伸速度160m/min,拉伸倍数2.76,其中一级拉伸2.4倍,二级拉伸1.15倍,拉伸油浴温度89-92℃,蒸汽102-106℃,牵伸辊:第一牵伸辊105℃,第二牵伸辊110℃,第三牵伸辊90℃,定型温度112-116℃。
5.权利要求1所述的制备方法中使用的后纺系统,其特征在于: 包括集束架、导丝机、油槽、第一牵伸机、油浴槽、第二牵伸机、蒸汽箱、第三牵伸机、叠丝机、葵花轮、松弛热定型机、曳引张力机、切断机和打包机,丝线经集束架集束成丝束后,经导丝机指引,在油槽中浸油,然后依次经过第一牵伸机、油浴槽、第二牵伸机、蒸汽箱、第三牵伸机进行拉伸,再通过叠丝机后送入葵花轮,在葵花轮的牵引下送入松弛热定型机进行定型,在曳引张力机的牵引下送入切断机进行切断,切断后的丝束进入打包机打包。
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