CN100473779C - 单丝、包括该单丝的织物及织物的制造方法 - Google Patents
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Abstract
本发明提供一种织物,织物包括多根功能性单丝,单丝具有使施加于织物的涂料得以固定的形状,以及所述织物具有提高的抗剥离性,所述剥离指涂料从织物剥离。本发明还描述了用于制造该单丝和织物的方法。
Description
技术领域
本发明涉及造纸技术。更具体地说,本发明涉及干燥织物,然而本发明通常可用于在造纸机的成形部、压榨部及干燥部所用的任何织物中以及工业加工织物。此处所述的工业加工织物可以包括用于以下产品的织物:其中包括用于制造湿法成网产品,例如纸、纸板、瓦楞纸板及卫生纸和纸巾产品;用于通过空气穿透干燥处理制造卫生纸及纸巾产品;用于制造湿法成网和干法成网的纸浆;用于与造纸相关的加工过程,例如使用淤浆过滤器及化学洗涤机的加工过程;以及用于制造以水刺技术(湿法加工)、熔喷技术、纺粘技术和气流成网针刺技术所生产的无纺物。此种工业加工织物包括无纺布,但并不局限于无纺布;其还包括用于无纺布制造过程中的压花织物、输送织物和支撑织物;以及过滤织物和过滤布。
背景技术
造纸过程中,在造纸机成形部,通过将纤维浆沉积到移动的成形织物上形成纤维素纤维网,纤维浆也就是纤维素纤维的水分散体。浆体中大部分的水通过成形织物排出,而纤维素纤维网则留在成形织物的表面。
刚形成的纤维素纤维网从成形部进入压榨部,压榨部包括一系列压榨压区。纤维素纤维网被压榨织物支撑,或者通常情况下位于两层这样的压榨织物之间,穿过压榨压区。在压榨压区中,纤维素纤维网受到压缩力的作用,该压缩力将水从网中挤出,并使网中的纤维素纤维彼此粘附,使得纤维素纤维网转变为纸幅。水由该一层压榨织物或多层压榨织物所吸收,并且理想的情况是不回到纸幅中去。
纸幅最终进入干燥部,干燥部包括至少一个可转动的干燥转鼓系列或烘筒系列,这些转鼓或烘筒由蒸汽在内部进行加热。干燥织物引导刚形成的纸幅以弯曲路径依次绕行该系列中的每个转鼓,且干燥织物使纸张紧贴在转鼓的表面。加热的转鼓通过蒸发作用使纸张的含水量降低至所需水平。
应该了解的是,成形、压榨及干燥织物在造纸机上都采取无端环(endless loop)的形式,并且都起到传送带的作用。应该进一步了解的是,纸张生产是一种以相当快的速度进行的连续过程。也就是说,在成形部,纤维浆连续地沉积到成形织物上,而刚生产出的纸张在离开干燥部后就被连续地卷绕到辊筒上。
现有织物以各种各样的形式设计而制造,以满足造纸机所需,织物按照所制造的纸张等级安装在造纸机上。通常,织物包括织造底布或其它形式的底布。此外,对用于压榨部的织物而言,压榨织物具有一层或多层底布,在其中有针刺精细的、非织造纤维材料的毛层。底布可以使用单丝纱线、捻合单丝纱线、复丝纱线或捻合复丝纱线织成,并且可以是单层的、多层的或层合的。纱线通常由在造纸机织物技术领域中的普通技术人员为此目的而使用的几种合成聚合树脂中的任意一种挤出而成,例如聚酰胺树脂及聚酯树脂。
织造底布本身可以采用许多不同的形式。举例来说,底布可被织成环形、或者先平织然后用接缝将其转变为环状形式。或者,底布可以由一种一般称为改进的环状织造的工艺来生产,其中底布的纬向边缘具有使用其纵向(MD)纱线所形成的缝合线圈。在此过程中,MD纱线在织物的纬向边缘之间连续地来回交织,在各边缘处折回并形成缝合线圈。以此方式生产的底布,在安装至造纸机时被放置成环状形式,因此被称为机上可缝合织物。为了将此种织物放置成环状形式,因此将两个纬向边缘拉在一起,两边缘处的缝合线圈彼此交叉,再引导一个缝合栓或缝合销穿过由交叉的缝合线圈所形成的通路。
此外,织造底布可通过下述方式层合而成:将至少一层底布放置于由另一底布所形成的无端环内,并类似于压榨织物的情况,针刺短纤维毛层穿过这些底布,以此将其彼此连接。织造底布的一层或多层可以都为机上可缝合形式。这是目前已知的具有多层底布支撑结构的层合压榨织物。
无论如何,织物是无端环的形式,或者可缝合成此种形式,其在纵向环绕测量时具有规定的长度,而在横向测量时具有规定的宽度。
现在更具体地谈及干燥部,干燥烘筒通常排列成顶行/层和底行/层。底层烘筒与顶层烘筒相对交错,而非呈严格垂直关系。当进行干燥的纸幅通过干燥部时,纸幅交替位于顶部和底部的烘筒之间,首先绕过两层之一层中的烘筒,然后绕过另一层的烘筒,循序前进直到通过整个干燥部。
在许多干燥部中,顶层和底层的烘筒各自套有单独的干燥织物。在这种类型的干燥部中,进行干燥的纸幅在未受支撑的情况下通过位于一层中的烘筒与另一层中的烘筒间的空间或“口袋”。
当机器速度提高时,被干燥的纸张在经过口袋的时候容易摆动,且通常会破裂。结果需要将整个造纸机停车,并将纸张重新穿过干燥部,从而对生产速度和效率造成不利的影响。
为了提高生产,并使纸幅所受干扰最小化,采用单程干燥部(single-run dryer sections),以高于传统干燥部所能达到的速度来运送要干燥的纸幅。在单程干燥部中,单一的干燥织物沿弯曲路径依次绕行顶层和底层的烘筒。同样地,如果纸张没有被有效地支持,其会被引导穿过顶层和底层之间的口袋。
应了解的是,在单程干燥部中,干燥织物将要干燥的纸幅直接靠在两层之一的烘筒上,但载着纸张环绕另一层的烘筒。或者,单程干燥部可只有一层烘筒。这种干燥部在各对烘筒之间的口袋中具有转向辊,其可以是平滑辊、沟槽辊或设有抽吸装置的辊。这种干燥部被称作单层干燥部(single-tier dryer section)。
在移动中的干燥织物靠近烘筒或转向辊的狭窄空间中,由移动中的干燥织物背面所携载的空气形成压缩楔形。由此导致在压缩楔形中气压增加,使空气穿过干燥织物向外流动。接着,当纸幅不在干燥织物和烘筒之间的时候,此气流可将纸幅推离干燥织物的纸张接触表面,此种现象称作“掉落”。“掉落”由于造成边缘破损而降低纸制品的品质,“掉落”若导致纸张断裂还会降低机器效率。
许多造纸厂通过对转向辊切削沟槽,或通过对这些转向辊加设真空源的办法来解决此项问题,其中转向辊与单层干燥织物直接接触。两种权益之计让收集于压缩楔形的空气不穿过干燥织物而被去除。
关于这一点,织物制造者也已经运用对织物施加涂料的方法,例如“纸张约束方法(sheet restraint method)”,以赋予织物附加的功能。作为一种附加功能性的方法,施加涂料对于织物,例如干燥织物的重要性,已由Luciano-Fagerholm(发明名称为“Dryer Fabric WithHydrophilic Paper Contacting Surface”的美国专利5,829,488(Albany))所引证。Luciano和Fagerholm已证实,对织物使用亲水性表面处理可赋予织物保持纸幅的性能,同时保持与最初的透过性相接近。然而,这种处理织物表面的方法,虽然成功地赋予纸张约束性,但仍需提高涂料的耐久性。因此,需要改进此涂料的耐磨性。
现在回到此前所使用的纱线,特别是干燥织物所用纱线,单丝纱线通常以简单的圆形截面而挤出。最近,已经生产出具有异形截面形状的单丝。这些异形单丝已经应用于织造织物,以改善织物表面质地或密度,或具体地说控制织物的透气性。现有技术包括美国专利4,633,596(Albany),其示出一种用于制造成形线的倒U形聚酯单丝,以产生所需的光滑表面。然而,其并未提到填充开口以形成双组分丝。美国专利5,097,872在造纸干燥织物的纵向纱线中使用X-结构截面的单丝。在织造过程中,此单丝变形,从而在织物朝向纸张一面上产生光滑表面,而同时在这些纱的背面上形成增强稳定性的隆起。美国专利4,216,257涉及U形单丝。在该专利中术语“U形”指单丝的纵向而非截面的形状。至少有三项明尼苏达矿业和制造专利提到这个概念。美国专利5,361,808披露了有突片的或T形的纱线,用作纬纱。要注意,其宣称使用此种纱线可以扩大透过性的范围。美国专利5,998,310示出具有各种不同截面的单丝,其可在织造过程中变形而产生许多效果。该专利描述了“Y”、“X”及“T”形的单丝,但未述及U形截面。美国专利6,372,068描述一种粘合至扁平带状基材的热塑性单丝,以形成用于包装的扎带(twist-tie)。美国专利6,124,015示出用于彼此互锁的纱线的异形部分。
特别关注的是美国专利5,888,915(Albany),其涉及由双组分纤维所构成的织物。双组分纤维具有熔点不同的皮和芯材料。在受热时,皮/芯纱线形成熔合的织物结构,其显示出更好的耐磨性及更好的耐久性。然而,现有技术都没有使用具有为TPU提供容纳之所的U-形的单丝,或具有将涂料锁入或固定的U-形的单丝。所有上述专利以引用方式并入本文。
发明内容
本发明的一个方面涉及一种织物,包含多根包括纵向沟槽的单丝,从而与不包含异形单丝的织物相比,为施加于所述织物的涂料提供固定作用,以及,具有提高的抗剥离性,所述剥离指所述涂料从所述织物剥离,其中所述涂料以机械固定方式附着于所述单丝。
本发明的另一方面涉及一种单丝,含有为涂料提供容纳之所的纵向沟槽,从而为施加于其上的涂料提供机械固定凹,其中所述涂料以机械固定方式附着于所述单丝。
本发明的又一方面涉及一种将涂料机械地固定于织物的方法,该方法包括以下步骤:由单丝形成织物,所述单丝包括一个或多个纵向沟槽,所述沟槽沿着所述单丝的长度方向延伸,以及所述沟槽提供各自的空腔;以及将涂料施加于所述织物,使得涂料填充所述空腔,以及涂料由此被机械地锁定入位,从而,与由不带沟槽的单丝所构成的织物相比,锁定入位的涂料具有提高的抗剥离性,所述剥离指涂料从织物剥离。
在一个实施例中,本发明为U形双组分单丝纤维,其使用具有热塑性聚氨酯(“TPU”)嵌入物的聚酯U形单丝,该嵌入物熔融粘结于“U”形的口袋中。双组分单丝可织入造纸织物内,使得TPU组分暴露于织物的纸幅侧上。TPU提供抓持性能,该抓持性能在造纸期间改进纸幅约束和纸幅引导。在第二实施例中,本发明为异形单丝纤维。该单丝具有空腔,空腔的底部比其敞开的顶部宽。涂料或熔融粘结TPU嵌入物填充该空腔,从而通过空腔的狭窄开口将其锁定入位。由于锁定入位的涂料具有提高的抗剥离性,因此其具有较长的使用寿命。在此参照附图对本发明的实施方式进行更全面详细地描述。
附图说明
图1A至图1E为本发明单丝的第一实施例的剖面图;
图2为制造本发明单丝所用方法的流程简图;以及
图3A至图3B为本发明单丝的第二实施例的剖面图。
具体实施方式
本发明的优选实施例将以造纸机干燥织物的情况进行描述。然而,要注意的是,本发明可以应用于造纸机的其它部分所用的织物中,以及其它工业装置所用的织物中,在这些工业装置中,引导或约束所制造的产品具有重要的意义。本发明可以应用于其它织物类型的部分实例包括:造纸机成形织物和压榨织物、空气穿透干燥(TAD)织物和纸浆成形织物。另一实例为用于与造纸加工相关的织物,例如淤浆过滤织物和化学洗涤机织物。本发明可应用于其它织物类型的实例为工程织物,例如在湿法成网、干法成网、熔喷技术及/或纺粘技术中用于制造无纺布的织物。
织物结构包括:机织、螺旋缠绕、针织、挤出成网、螺旋形连结、螺旋卷(spiral coil)及其它无纺布。这些织物还可包括单丝纱线、捻合单丝纱线、复丝纱线或捻合复丝纱线,并且可以是单层、多层或层合的。纱线通常由在工业织物技术领域中的普通技术人员为此目的而使用的几种合成聚合树脂中的任意一种挤出而成,例如聚酰胺树脂及聚酯树脂。
本发明的双组分单丝纤维1的优选实施例示于图1A至图1E(剖面图)中。双组分单丝1织入织物中,并为该织物提供改进的抓持性质。在优选实施例中,双组分单丝1具有聚酯组分2和TPU组分3。TPU组分3可以是包埋于或嵌入聚酯组分2内的嵌入物或芯。聚酯组分2可以是构成皮层的U形低熔点聚酯单丝。如后所述,该皮层可以与该TPU芯组分3熔融粘结。在图1A至图1E所示的实施例中,聚酯单丝2具有一个或多个U形沟槽4。然而,也可使用具有其他形状的沟槽,例如C-形。聚酯单丝2可以采取各种形状和尺寸,包括正方形、矩形、椭圆形或任何适合此目的的其它形状。TPU组分3机械地插入U形沟槽4内。TPU组分3可以采取各种形状和尺寸。例如,在图1A和图1D中,TPU组分3是圆形的,而在图1B和图1C中TPU组分3则较扁且不太圆。
在图2的流程图中示出一种双组分单丝及包括双组分单丝的织物的制造方法5。图中,方格6例示这样的步骤:将低熔点聚酯(例如用碳二亚胺稳定)挤出,形成具有一个或多个沿着单丝长度方向延伸的U形沟槽的单丝。下一个步骤7是在需要时,确保该挤出的聚酯单丝被适当取向(拉伸)。步骤8为挤出TPU单丝纤维,不进行取向,从而TPU单丝具有可以插入聚酯组分的U形沟槽中的尺寸。因此,如果采用一个以上的U形沟槽,该一个或多个TPU芯于是被插进低熔点聚酯单丝的沟槽内(步骤9)。然后,如果没有足够的支承力或磨擦力将TPU芯维持在沟槽中,则在必要时,双组分单丝结构可穿过烘箱并局部受热(步骤10),以在TPU芯和聚酯皮之间产生粘结。如此形成的U形双组分单丝纤维现在可被收集(步骤11),并最终织入工业织物或其它类似织物内(步骤12)。
要注意的是,双组分单丝织入织物中,使TPU组分位于单丝表面之上并暴露于该织物的造纸面上。其优点是,TPU可以提供改进的抓持性,在织物是造纸织物时,能增强对纸幅的约束和纸幅的引导。特别是,在由此种单丝所制造的干燥织物中,双组分单丝提供耐用性,这种耐用性为具有涂料的织物所通常表现的类型,该涂料可从Albany国际公司以商品名AEROGRIP的产品购得。
AEROGRIP涂覆产品及/或根据美国专利5,829,488所涂覆产品所具有的更好的耐久性,由本发明实施例二进一步说明,并例示于图3A至图3B。在这一方面,某些原始概念是适用的。大体而言,应注意的是,造纸织物的涂料在织物使用期间经受常规磨耗。此种磨耗的机理之一是涂料逐渐从织物表面剥离。通过本发明的第二实施例,如下所述,通过将涂料机械地固定于该织物而进一步延长AEROGRIP涂覆产品的使用寿命。此目的通过使用织入织物内的异形单丝来实现。更具体地说,该异形单丝包括沿着其长度延伸的空腔,该空腔为施加至织物的涂料提供机械固定凹(mechanical anchor)。
图3A为没有涂料的异形单丝20实例的剖面图,示出至少一个空腔作为涂料的固定凹。在此例中,单丝20具有形成于其中的单个空腔21。然而在单丝20中可以形成多个此种空腔21。在图3A所示的实例中,空腔21的底部23比其敞开的顶部24宽。然而,也可使用具有其它形状的空腔。图3B为具有空腔21且同时其上施加有涂料22的异形单丝20的剖面图,例如AEROGRIP涂料。涂料22填充空腔21,从而通过该空腔21的狭窄开口24而使涂料锁定入位。或者,可用熔融粘结TPU嵌入物来填充该空腔。如此固定的涂料22由于具有提高的抗剥离性,抵抗其从单丝20剥离,因而具有更长的使用寿命。如图3B所清楚示出的,涂料、TPU或其它材料位于单丝的表面之上,因此在使用中,例如用于造纸过程中,会与制造的纸幅制品相接触。
对于本领域技术人员来说,可以容易地对上述实施方案进行多种修改和改进,或应用于其它领域,而不偏离本发明的目的、精神和范围。所有这些改动均在本发明权利要求范围内。例如,虽然本发明的一些讨论具体针对干燥织物,但其也可以应用于造纸工业和其它工业应用中的施加有涂料的其它带。此种应用包括:例如输送带及靴形压榨带;由空气穿透干燥(TAD)工艺生产的用于卫生纸或纸巾商品的带/织物;以及需要在织物边缘上设置抗磨耗或耐热涂料或挤出物的任何造纸或与造纸加工相关的织物/带。同时,虽然本发明具体提及AEROGRIP涂料,但本发明也可以采用工业应用中通常使用且本领域普通技术人员显而易知的其它涂料和浸渍剂。
Claims (17)
1.一种织物,包含多根包括纵向沟槽的单丝,从而与不包含异形单丝的织物相比,为施加于所述织物的涂料提供固定作用,以及,具有提高的抗剥离性,所述剥离指所述涂料从所述织物剥离,其中所述涂料以机械固定方式附着于所述单丝。
2.根据权利要求1所述的织物,所述沟槽包括至少一个沿其长度方向延伸的空腔,该空腔具有封闭底部和敞开的顶部,所述空腔的底部比其敞开的顶部宽,从而涂料填充所述空腔并由此而锁定入位。
3.根据权利要求2所述的织物,所述单丝包括至少两个沟槽。
4.根据权利要求1所述的织物,其中在所述异形单丝形成为织物之前,向其施加所述涂料。
5.根据权利要求1所述的织物,其中所述织物是成形织物、压榨织物、干燥织物、TAD织物、纸浆成形织物、淤浆过滤织物、化学洗涤机织物、或工程织物、或靴形压榨带或输送带。
6.根据权利要求1所述的织物,其中所述织物选自主要由机织物、螺旋缠绕织物、针织物、挤出网眼织物、螺旋链结织物、螺旋卷织物以及其它无纺织物所组成的组。
7.根据权利要求1所述的织物,其中所述涂料是聚氨酯。
8.根据权利要求1所述的织物,其中所述涂料施加于织物的至少一个侧面,以及所述涂料具有耐磨性和耐热性。
9.一种单丝,含有为涂料提供容纳之所的纵向沟槽,从而为施加于其上的涂料提供机械固定凹,其中所述涂料以机械固定方式附着于所述单丝。
10.根据权利要求9所述的单丝具有U形截面。
11.根据权利要求9所述的单丝,其中所述沟槽包括至少一个沿其长度方向延伸的空腔,该空腔具有封闭底部和单丝表面中的敞开的顶部,所述空腔的底部比其敞开的顶部宽。
12.根据权利要求11所述的单丝,包括至少两个沟槽。
13.根据权利要求11所述的单丝,其中当施加涂料时,所述涂料填充所述空腔,并由此锁定入位。
14.根据权利要求13所述的单丝,其中所述涂料填充所述空腔,以及,位于所述单丝表面之上。
15.根据权利要求13所述的单丝,其中锁定入位的涂料具有抗剥离性,所述剥离指所述涂料从所述单丝剥离。
16.根据权利要求9所述的单丝,其中所述涂料是聚氨酯。
17.一种将涂料机械地固定于织物的方法,该方法包括以下步骤:
由单丝形成织物,所述单丝包括一个或多个纵向沟槽,所述沟槽沿着所述单丝的长度方向延伸,以及所述沟槽提供各自的空腔;以及
将涂料施加于所述织物,使得涂料填充所述空腔,以及涂料由此被机械地锁定入位,从而,与由不带沟槽的单丝所构成的织物相比,锁定入位的涂料具有提高的抗剥离性,所述剥离指涂料从织物剥离。
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CN106192123B (zh) * | 2016-08-31 | 2018-05-15 | 艾艾精密工业输送系统(上海)股份有限公司 | 一种输送带用高弹工业布及其制备方法 |
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-
2002
- 2002-12-30 US US10/334,168 patent/US20040127127A1/en not_active Abandoned
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2003
- 2003-11-17 CA CA 2505203 patent/CA2505203C/en not_active Expired - Lifetime
- 2003-11-17 WO PCT/US2003/037039 patent/WO2004061209A1/en active Application Filing
- 2003-11-17 EP EP03786892.4A patent/EP1579060B1/en not_active Expired - Lifetime
- 2003-11-17 CN CNA2008101809145A patent/CN101408009A/zh active Pending
- 2003-11-17 NZ NZ539757A patent/NZ539757A/en unknown
- 2003-11-17 RU RU2005124299A patent/RU2326201C2/ru not_active IP Right Cessation
- 2003-11-17 ZA ZA200503598A patent/ZA200503598B/en unknown
- 2003-11-17 CN CNB2003801059430A patent/CN100473779C/zh not_active Expired - Lifetime
- 2003-11-17 AU AU2003295691A patent/AU2003295691A1/en not_active Abandoned
- 2003-11-17 JP JP2004565038A patent/JP4409445B2/ja not_active Expired - Lifetime
- 2003-11-17 MX MXPA05006466A patent/MXPA05006466A/es active IP Right Grant
- 2003-11-17 BR BRPI0317853-6B1A patent/BR0317853B1/pt active IP Right Grant
- 2003-11-17 KR KR1020057011768A patent/KR20050089069A/ko not_active Application Discontinuation
- 2003-11-25 TW TW92133046A patent/TWI279470B/zh not_active IP Right Cessation
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2005
- 2005-07-29 NO NO20053705A patent/NO20053705L/no not_active Application Discontinuation
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2007
- 2007-10-09 US US11/973,503 patent/US20080038974A1/en not_active Abandoned
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2008
- 2008-05-05 US US12/115,097 patent/US7579291B2/en not_active Expired - Lifetime
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TWI279470B (en) | 2007-04-21 |
KR20050089069A (ko) | 2005-09-07 |
NO20053705D0 (no) | 2005-07-29 |
MXPA05006466A (es) | 2005-08-26 |
ZA200503598B (en) | 2006-08-30 |
NO20053705L (no) | 2005-09-13 |
TW200419039A (en) | 2004-10-01 |
AU2003295691A1 (en) | 2004-07-29 |
JP4409445B2 (ja) | 2010-02-03 |
WO2004061209A1 (en) | 2004-07-22 |
NZ539757A (en) | 2006-10-27 |
US7579291B2 (en) | 2009-08-25 |
JP2006512505A (ja) | 2006-04-13 |
US20080207072A1 (en) | 2008-08-28 |
BR0317853B1 (pt) | 2014-12-23 |
US20080038974A1 (en) | 2008-02-14 |
CA2505203C (en) | 2013-09-17 |
EP1579060B1 (en) | 2016-02-24 |
BR0317853A (pt) | 2005-12-06 |
CN1726316A (zh) | 2006-01-25 |
CA2505203A1 (en) | 2004-07-22 |
CN101408009A (zh) | 2009-04-15 |
EP1579060A1 (en) | 2005-09-28 |
US20040127127A1 (en) | 2004-07-01 |
RU2005124299A (ru) | 2006-01-27 |
RU2326201C2 (ru) | 2008-06-10 |
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