CN112041497B - 自包裹套筒及其构造方法 - Google Patents

自包裹套筒及其构造方法 Download PDF

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Publication number
CN112041497B
CN112041497B CN201980028785.4A CN201980028785A CN112041497B CN 112041497 B CN112041497 B CN 112041497B CN 201980028785 A CN201980028785 A CN 201980028785A CN 112041497 B CN112041497 B CN 112041497B
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China
Prior art keywords
layer
self
sleeve
woven layer
woven
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CN112041497A (zh
Inventor
伊藤绘美
米重勇生
山口大树
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Federal Mogul Powertrain LLC
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Federal Mogul Powertrain LLC
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/105—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by needling
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    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H81/00—Methods, apparatus, or devices for covering or wrapping cores by winding webs, tapes, or filamentary material, not otherwise provided for
    • B65H81/06—Covering or wrapping elongated cores
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0035—Protective fabrics
    • D03D1/0043—Protective fabrics for elongated members, i.e. sleeves
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    • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
    • D04B1/16—Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
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    • D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
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    • H02G3/0462—Tubings, i.e. having a closed section

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
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Abstract

提供了一种自包裹套筒及其构造方法。所述套筒包括细长的多层管状壁，所述管状壁具有相对的边缘，所述相对的边缘在所述套筒的相对端之间沿着所述套筒的纵轴延伸。相对的边缘绕纵向轴线偏置成自包裹结构，以限定由管状壁界定的内部空腔。所述管状壁包括缠绕纤维的非织物层和交织细丝的纺织层，其中，所述非织物层通过与所述纺织层的细丝缠结的针刺纤维而固定到所述纺织层。

Description

自包裹套筒及其构造方法
交叉引用
本申请要求2018年4月6日提交的美国临时申请62/654,177和2018年10月2日提交的美国发明申请16/150,140的优先权，在此通过引用将其整体并入本文。
背景技术
技术领域
本发明一般涉及保护性非织物套筒，其可以安装在诸如电线、线束、管子、软管等类似的细长物品上，以保护此类细长物品不受热、割伤、擦伤、磨损、撞击和/或损坏、屏蔽振动、噪音、电磁干扰和/或恶劣环境。
相关技术
美国专利7,523,532和7,754,301公开了一种非织物套筒，用于覆盖细长的物品，例如电线、线束、管道、软管等。所教导的这种非织物套筒被均匀地压缩至期望的密度(其可以根据应用而变化)并且还被偏压成自卷曲的形状，从而当套筒被迫沿着其狭缝边缘被打开并定位在围绕细长的物品，松开套筒使其自卷曲并缠绕在细长的物品上。这样的套筒具有可自动包裹并由非织物材料制成的优点，但也有其局限性，因为致密的自卷曲特性具有使产品相当坚硬并沿其长度不易弯曲的效果。当使用套筒来覆盖具有蜿蜒曲折曲率的细长物品(例如弯曲的线束)时，这可能带来挑战。此外，尽管上述套筒可用于提供抵抗振动和噪声衰减的保护，但是它通常不适于抗电磁干扰(EMI)、射频干扰(RFI)或静电放电(ESD)。
发明内容
提供了用于包裹和保护细长构件的自包裹套筒。套筒包括细长壁，该细长壁具有沿套筒的纵向轴线在套筒的相对端之间延伸的相对的边缘。相对的边缘围绕纵向轴线偏置成自包裹构造，以限定管状腔。相对的边缘在外部施加的力下可彼此延伸开以暴露出用于插入或移除细长构件的腔，在移除外部施加的力时返回其自包裹构造。壁包括缠结纤维的非织物层(非织物是众所周知的技术术语，通常被理解为在套筒形成过程中形成，例如，通过制造玻璃纤维、毛毡等进行使用，通过示例而不作限制)和交织细丝的纺织层(织物的单丝和/或复丝，彼此织物或结合)，其中，通过将非织物层的纤维与纺织层的细丝缠结，将非织物层固定至纺织层。
根据本公开的另一方面，通过将非织物层的纤维推入与纺织层的交织细丝缠结而形成多个周向延伸的针刺第一带部分，从而通过将第一部分进行针刺和致密化(通过在针刺过程中压紧来增加密度)赋予套筒增强的环向强度，并且不需要附加的固定机构以将非织物层固定到交织的纺织层上，多个沿周向延伸的非针刺第二带部分，与第一带部分之间交替地延伸，其中，第二带部分不包含被针刺并与纺织层的细丝缠结的非织物层的纤维，从而通过不被针刺过程致密化且不被锁定到纺织层上赋予套筒增强的柔韧性，从而相对于套筒可以自由移动和弯曲。
根据本公开的另一方面，第一带部分和第二带部分使壁具有回旋轮廓，针刺的第一带部分形成压锁的谷，从而增强了壁的环向抗压强度，非针刺的第二带形成峰并增强壁保持圆形、柔性且无扭结的能力，以使套筒能够绕曲折路径行进，而不会沿着壁的接缝开口并且不会扭结。
根据本公开的另一方面，纺织层可以形成为选择的单细丝和/或多细丝的织物层，以向套筒提供期望的物理特性，其中，至少一些细丝可被热定形以具有热定形的形状，以有利于将套筒保持在自包裹的、周向闭合的构造中，并且相对的边缘彼此重叠。
根据本公开的另一方面，纺织层可以形成为单细丝和/或多细丝的编织层，以向套筒提供期望的物理性能，其中至少一些细丝套筒可以热定形以具有热定形形状，以便于将套筒保持在自包裹的，周向闭合的构造中，并且相对的边缘彼此重叠。
根据本公开的另一个方面，所述纺织层可以形成为单细丝和/或多细丝的结合层以向所述套筒提供期望的物理性能，其中至少一些细丝中的套筒可以热定形以具有热定形形状，以有利于将套筒保持在自包裹的，周向闭合的构造中，并且相对的边缘彼此重叠。
根据本公开的另一方面，所述纺织层可以被构造成形成所述套筒的内表面以立即提供期望的保护，所述期望的保护立即邻接容纳在所述套筒内的所述细长构件，这可以包括避免卡在所述细长构件上，如果非织物层与细长构件直接邻接，将更倾向于发生卡在所述细长构件上的情况，非织物层可以构造成形成套筒的外表面，从而通过能够吸收冲击力而提供增强的抗冲击性，同时还通过非织物层纤维的相对紧密缠结的关系提供增强的热保护，其中可以选择纤维以提供所需的特定保护性质。
根据本公开的另一方面，非织物层的至少一些纤维可以是可热定形的，以呈现热定形形状，从而有助于将套筒保持在自包裹的、周向闭合的构造中，相对的边缘彼此重叠。
根据本公开的另一方面，套筒的壁可以进一步包括夹在非织物层和纺织层之间的金属箔层，从而为包含在套筒中的细长构件提供保护以防止(EMI)、(RFI)和(ESD)，其中，与纺织层缠结的非织物层的纤维穿过金属箔层以将所有层彼此锁定，而无需使用辅助固定机构。
根据本公开的另一方面，壁的所有层可以仅通过将非织物层的纤维与纺织层的细丝缠结而彼此固定，从而消除了昂贵的辅助固定机构，例如，粘合剂或其他的需要。
根据本公开的另一方面，如果仅一层是可热定形的，则至少可以通过仅一层必须包含更昂贵的可热定形的纤维或细丝或两者来节省成本，如果需要更大的卷曲力以增强自包裹能力，则可以对壁的非织物层和纺织层进行热定形，以将壁的相对边缘偏置成彼此重叠的关系。
根据本公开的另一方面，提供了一种构造用于按路线发送和保护细长构件的自包裹套筒的方法。该方法包括提供细长的非织物层和纺织层。此外，将非织物层和纺织层彼此重叠放置，并用针刺非织物层以使非织物层的纤维与纺织层的细丝缠结，以形成非织物层和纺织层具有相对边缘的壁，织物层和纺织层在相对的两端之间纵向延伸。此外，热定形非织物层和/或纺织层中的至少一层以在壁中施加偏压以将壁偏压成自包裹的管状构造，以限定内部管状腔体以容纳要保护的细长构件。
根据本公开的另一方面，该方法可以进一步包括：经由与纺织层的细丝缠结的非织物层的纤维形成多个周向延伸的第一带部分，以及形成多个周向延伸的第二带部分，所述第二带部分在第一带部分之间延伸并与第一带部分交替，其中第二带部分内的非织物层的纤维不与纺织层的细丝缠结，从而第二带为套筒提供增强的柔韧性和抗扭结特性，缠绕在一起的第一带部分为套筒提供增强的环向强度。
根据本公开的另一方面，该方法可以进一步包括：通过相互缠绕的第一带部分形成具有回旋轮廓的壁，通过其余未压缩的、未致密化的部分形成谷，致密的、相互缠绕的第一带部分提高了壁的环向强度，而非致密的、不相互缠绕的第二带部分，增强了壁保持圆形、高柔韧性和不打结的能力，在壁弯曲以使套筒绕曲折蜿蜒的路径和拐角布设时而不会沿壁的接缝开口。
根据本公开的另一个方面，该方法可以进一步包括提供纺织层作为织物层。
根据本公开的另一方面，该方法可以进一步包括提供纺织层作为编织层。
根据本公开的另一方面，该方法可以进一步包括提供纺织层作为结合层。
根据本公开的另一个方面，该方法可以进一步包括布置纺织层以形成套筒的内表面，以提供期望的保护并且避免被保护的细长构件卡住和布置非织物层以形成套筒的高度抗冲击的、热保护的外表面。
根据本公开的另一方面，该方法可以进一步包括将金属箔层夹在非织物层和纺织层之间，以向套筒提供EMI、RFI和ESD保护性能，以及在针刺过程中，用非织物层的纤维穿透金属箔层以将层固定成彼此成层的关系，而无需昂贵的辅助处理和固定机构。
根据本公开的另一方面，该方法可以进一步包括仅通过将非织物层的纤维与纺织层的细丝缠结而将壁的各层彼此固定，从而避免了昂贵的辅助固定机构和处理。
根据本公开的另一方面，该方法可以进一步包括热定形壁非织物层和纺织层中的至少一个或两者，以将壁的相对边缘偏置成彼此重叠的关系。
附图说明
鉴于以下对当前优选实施例、最佳模式、所附权利要求书和附图的详细描述，对于本领域技术人员而言，本公开的这些和其他方面、特征和优点将变得显而易见。
图1是根据本公开的一个方面构造的套筒的透视图；
图2是大体沿图1中的线2-2截取的剖视图；
图2A是根据本公开的另一方面构造的套筒的类似于图2的视图；
图3是根据本公开的一个方面构造的套筒的侧视图，显示为弯曲成非扭结的U形；
图4是根据本公开的一个方面用于构造套筒过程的示意图；以及
图4A是根据本公开的另一方面用于构造套筒过程，类似于图4的视图。
具体实施例
更详细地参考附图，图1显示了根据本公开的一个方面构造的套筒10，其由于在构造中被热定形而被自动包裹。套筒10具有细长的多层壁12，该细长的多层壁12具有相对的纵向延伸的边缘14、16，该边缘在套筒相对的开口端20、22之间大致平行于套筒10的纵向轴线18延伸。相对的边缘14、16被偏置成彼此自包裹、重叠的关系，以限定管状内部空腔24。当需要时，相对的边缘14、16可在外部施加的力下彼此远离地延伸，以暴露出内部空腔24，用于插入或移出一个或多个细长构件26，并在移去外部作用力后自动返回其自包裹构造。该壁包括缠绕纤维30的外部非织物层28和交织细丝34的内部纺织层32(交织细丝34可以是任何所需材料的单细丝和/或多细丝，包括可热固和(/或非热固性材料)，并且可以通过机织、编织或结合使用任何所需图案来交织，例如平纹机织，如果机织的话，或其他方式)，其中，通过诸如图4和4A所示的针刺工艺将非织物层28的纤维30与纺织层32的细丝34缠结，非织物层28固定到纺织层32上。因此，非织物层28和纺织层32可以仅通过针刺过程彼此固定，而不需要昂贵的辅助固定机构和处理，例如杂乱、昂贵的粘合剂或其他类型的紧固件装置。
根据本公开的一个方面，如图4所示，非织物层28和纺织层32最初被构造为平层，并且以彼此重叠的方式进给，其中非织物层28面向针刺机38的多个针36。以期望的数量和图案布置针36，以在非织物层28中产生期望的针刺图案(宽度和密度)。针刺机38循环以用针36穿透非织物层28和下面的纺织层32，针36将非织物层28的多个纤维30与纺织层32的细丝34缠结在一起。因此，非织物层28和纺织层32彼此固定以防止分离，而不需要附加的粘合和固定机构，例如粘合剂，尽管在本文中设想如果需要的话，可以使用这种附加的粘合机构。进行针刺以产生沿层28、32的长度彼此交替的第一和第二周向延伸的带40、42。形成具有压缩的致密的针刺纤维30的第一带40，形成保持非压缩、非致密和非针刺纤维30的第二带42。本领域的技术人员将理解，第一带和第二带40、42可以形成为具有任何期望的宽度(宽度旨在表示沿着轴18长度方向延伸的距离)以期望赋予成品套筒10所需的挠曲，抗压强度和抗冲击性(防撞保护)。在平整的非织物层28和纺织层32被针刺并层压(固定)在一起以形成多层壁12的材料后，壁12具有回旋轮廓，形成第一带40的针刺材料的谷V，提供增强的环向强度，以及形成第二带42的非针刺材料的峰P，可提供增强的柔韧性，随后可被包裹并热成形(热定形)成偏置的、自包裹的管状构造，以形成管状套筒10。具有层28、32中的至少一个或两个的壁12被热定形成其卷曲形状时，裂口(也称为接缝44)沿着套筒10的长度延伸，其中壁12在松弛、自包裹构造时，提供周向封闭的内部空腔24。应该理解的是，层28、32中仅一个可以分别包括热定形纤维和细丝，而另一层28、32可以是空的，因此分别没有更昂贵的热定形纤维和细丝。相反，在需要增加卷曲力以增强壁12的自包裹能力的情况下，层28、32可分别包括热定形纤维和细丝。由于壁12是卷曲的，内部空腔24通常是管状的，并且易于沿着套筒10的整个中央纵向轴线18接近，从而使得细长构件26(例如，电线或线束)，可以容易地将其放置在内部空腔24中，并且相反地，例如在使用期间，通过迫使套筒10的沿长度方向延伸的自由边缘14、16彼此克服热定形偏置而彼此远离，而从内部空腔24中移出，该热定形偏置是在壁12的至少一部分内施加的以克服自闭合的，热形成的偏压力打开接缝44，其量足以通过打开的开口接缝44引入或移除细长构件26。
在图2的实施例中，除非，如下所述，需要另外的层，否则非织物层28和纺织层32形成多层套管10的整体。因此，套筒10的结构消除了对附加材料层以提供保护或其他功能例如卷曲的需求。非织物层28的材料可以至少部分地由可热定形纤维材料的任何类型和组合提供。该材料可以选择为耐磨的、柔性的、弹性的、隔音的聚合材料，例如聚酯。选择并入非织物层28的示例性选择的纤维材料可以是但不限于聚对苯二甲酸乙二酯(PET)。该材料可以包括与任何数量和类型的聚合物或非聚合物填充材料(例如，切碎的废布、碎布、亚洲硬纸板等)组合的基础聚合物材料(例如，但不限于PET)。套筒10非常适合于保护内部空腔24中的细长构件26免受磨损、振动、热条件和主要通过非织物层28的冲击造成的损害，同时还抑制了与细长构件26的缠结、嘎嘎声和吱吱声或通过纺织层32产生不希望的刺耳声和/或噪音。此外，由于非织物层28在第一带40中被针刺到纺织层32而在第二带42中未被针刺，套筒如图3所示，可以绕如图3所示的弯曲路径和锐角的路径，而不会导致接缝44张开并且不会导致壁12扭结。针刺纤维30的第一带40被致密化并赋予壁增强的抗压(箍)强度，而非针刺纤维30的第二带42未通过针刺致密，因此赋予套筒10以柔性，从而提供增强的环向强度和增强的柔韧性的协同作用，该协同作用使套筒10能够按预期发挥功能，而不会损害壁12围绕细长部件26保持完全包裹状态的能力。用于构造套筒10的材料和处理过程在制造和使用中是经济的。
如图2A和4A所示，提供了根据本公开的另一个方面构造的套筒110，其中与上面使用的相同附图标记偏移了100，用于标识相同的特征。套筒110具有壁112，该壁112包括非织物层128、纺织层132，和金属箔层46，例如铝或其他合适的金属材料的金属箔层，金属箔层夹在非织物层128和纺织层132之间。壁112的构造类似于上述结构的壁12；然而，在进行针刺处理之前，如上所述，箔层46被夹在外部非织物层128和内部纺织层132之间。各个层128、46、132彼此叠置，优选地，使得它们各自外部外围彼此齐平对齐，则如上所述进行针刺过程，以形成轴向交替的第一带和第二带140、142。如图4A中最佳所示，非织物层128的针刺纤维130穿透穿过金属箔层46与纺织层132的细丝134缠结。因此，如上所述，各个层128、46、132彼此固定，而无需另外的固定机构，但是，附加的固定机构，如果需要，可以使用。当然，如果避免进一步的固定机构，则可以降低成本。然后，在形成非织物层128、金属箔层46和纺织层132的固定叠层之后，可以对壁112进行热定形以将壁112的相对边缘114、116永久地偏置成彼此重叠的关系以形成管状壁112。鉴于本文的公开内容，本领域技术人员将理解，金属箔层46的存在增强了对热效应以及对电磁干扰的防护。
显然，根据以上教导，本发明的许多修改和变化是可能的。可以想到，所有权利要求和所有实施例的所有特征可以彼此组合，只要这样的组合不会彼此矛盾即可。因此，应当理解，在所附权利要求的范围内，可以以不同于具体描述的方式来实践本发明。

Claims (18)

1.一种用于布设和保护细长构件的自包裹套筒，包括：
细长壁，所述细长壁具有沿套筒的纵向轴线在套筒的相对端之间延伸的相对的边缘，所述相对的边缘围绕纵向轴线偏置成自包裹构造，以限定内部空腔，所述相对的边缘在外部施加的力下可远离彼此延伸开以暴露出用于插入或移除细长构件的内部空腔，在移除外部施加的力时返回其自包裹构造，所述细长壁包括缠结纤维的非织物层和交织细丝的纺织层，其中，通过将所述非织物层的纤维与所述纺织层的细丝缠结，将所述非织物层固定至所述纺织层；
所述细长壁具有多个沿周向延伸的第一带部分和多个沿周向延伸的第二带部分，所述多个第一带部分和所述第二带部沿所述套筒的长度彼此交替，所述第一带部分被针刺，所述非织物层的所述纤维与所述纺织层的所述细丝缠结，所述第二带部分不被针刺，使得所述非织物层的所述纤维不与所述纺织层的所述细丝缠结。
2.如权利要求1所述的自包裹套筒，其特征在于，所述非织物层和所述纺织层中的至少一个被热定形，以使所述相对边缘围绕纵轴偏置到自包裹构造中。
3.如权利要求2所述的自包裹套筒，其特征在于，所述非织物层被热定形以使所述相对的边缘围绕纵轴偏置到自包裹构造中。
4.如权利要求3所述的自包裹套筒，其特征在于，所述纺织层不是热定形的。
5.如权利要求3所述的自包裹套筒，其特征在于，所述纺织层被热定形以将所述相对边缘偏置成围绕纵轴的自包裹构造。
6.如权利要求5所述的自包裹套筒，其特征在于，所述非织物层不是热定形的。
7.如权利要求2所述的自包裹套筒，其特征在于，所述非织物层和所述纺织层均被热定形，以使所述相对边缘围绕纵轴偏置到自包裹构造中。
8.如权利要求1所述的自包裹套筒，其特征在于，所述细长壁还包括夹在所述非织物层和所述纺织层之间的金属箔层，其中，与所述纺织层缠结的所述非织物层的所述纤维穿过所述金属箔层。
9.如权利要求8所述的自包裹套筒，其特征在于，所述非织物层、所述纺织层和所述金属箔层仅通过将所述非织物层的所述纤维与所述纺织层的所述细丝缠结而彼此固定。
10.一种构造自包裹套筒的方法，包括：
提供细长的非织物层；
提供纺织层；
将所述非织物层和所述纺织层相互重叠放置；
针刺所述非织物层以使所述非织物层的纤维与所述纺织层的细丝缠结，以形成多层壁，所述多层壁的所述非织物层和所述纺织层的相对边缘在相对端之间纵向延伸；以及
将壁热定形为管状自包裹结构，所述壁的相对边缘彼此偏置成重叠关系，从而限定内部空腔；
所述方法还包括：在所述非织物层中针刺多个沿周向延伸的第一带部分，以使所述非织物层的纤维与所述纺织层的细丝缠结，形成多个沿周向延伸的非针刺的第二带部分，所述第二带部分在所述第一带部分之间延伸并与所述第一带部分交替，其中，第二带部分内的所述非织物层的所述纤维不与所述纺织层的细丝缠结。
11.如权利要求10所述的方法，其特征在于，还包括经由形成谷的所述第一带部分和形成峰的所述第二带部分形成具有回旋轮廓的壁。
12.如权利要求10所述的方法，其特征在于，还包括布置所述纺织层以形成所述套筒的内表面，以及布置所述非织物层以形成所述套筒的外表面。
13.如权利要求10所述的方法，其特征在于，还包括将金属箔层夹在所述非织物层和所述纺织层之间，用与所述纺织层缠结的所述非织物层的所述纤维穿透所述金属箔层。
14.如权利要求10所述的方法，其特征在于，还包括仅通过将所述非织物层的所述纤维与所述纺织层的所述细丝缠结而将所述非织物层和所述纺织层彼此固定。
15.根据权利要求10所述的方法，还包括在所述非织物层和所述纺织层中的至少一层中施加热定形，以将所述壁的相对边缘偏置成彼此重叠的关系，而不在非织物层和纺织层中的另一层施加热定形。
16.根据权利要求15所述的方法，还包括在所述非织物层中施加热定形。
17.根据权利要求15所述的方法，还包括在所述纺织层中施加热定形。
18.根据权利要求10所述的方法，还包括在所述非织物层和所述纺织层中均施加热定形，以将所述壁的相对边缘偏置成彼此重叠的关系，而无需对所述非织物层和所述纺织层中的其他层进行热定形。
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