CN107205870A - 裤型吸收制品 - Google Patents

裤型吸收制品 Download PDF

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Publication number
CN107205870A
CN107205870A CN201580075697.1A CN201580075697A CN107205870A CN 107205870 A CN107205870 A CN 107205870A CN 201580075697 A CN201580075697 A CN 201580075697A CN 107205870 A CN107205870 A CN 107205870A
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CN
China
Prior art keywords
fibrous layer
elastic laminate
absorbent article
type absorbent
pant type
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201580075697.1A
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English (en)
Inventor
I·沃格达尔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Essity Hygiene and Health AB
Original Assignee
SCA Hygiene Products AB
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Filing date
Publication date
Application filed by SCA Hygiene Products AB filed Critical SCA Hygiene Products AB
Publication of CN107205870A publication Critical patent/CN107205870A/zh
Pending legal-status Critical Current

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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • A61F13/4963—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs characterized by the seam
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    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A—HUMAN NECESSITIES
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    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49014—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels
    • A61F13/49015—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels the elastic means being elastic panels
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Abstract

本发明涉及裤型吸收制品，例如纸尿裤、卫生裤或失禁裤。所述制品包括前部(2)、后部(3)和裆部(4)，其中所述前部(2)和后部(3)的侧边部(17，18；19，20)重叠，使得它们的内表面面对彼此并且沿着边缝(12，13)彼此接合。所述前部和后部中的至少一部分——包括所述侧边部(17，18；19，20)在内——包含弹性层合物(21)，其中所述弹性层合物(21)包含第一纤维层和第二纤维层(22；23)以及位于其间的弹性膜层(24)；所述第一纤维层(22)形成所述弹性层合物(21)的面向穿着者的内侧，所述第一纤维层(22)的基重为13～30g/m2；并且所述第一纤维层的基重比所述第二纤维层(23)的基重高10～300％，其中第一纤维层(22)沿着所述边缝(12，13)面对彼此。

Description

裤型吸收制品
技术领域
本发明涉及裤(pant)型吸收制品，例如纸尿裤、卫生裤或失禁裤。所述制品包括前部、后部和裆部，其中所述前部和后部的侧边部重叠，使得其内表面面对彼此并且沿着边缝彼此接合以界定腰部开口和一对腿部开口。所述前部和后部的至少一部分(包括所述侧边部在内)包含弹性层合物，所述弹性层合物包含第一纤维层和第二纤维层以及位于其间的弹性膜层。
背景技术
裤型吸收制品类似于普通内裤，并且包含裤形基体(chassis)和与该基体结合成为一体的吸收芯组件。它们旨在舒适且贴身地适合于穿着者。进一步期望的是，制品能够在穿着者的臀部上方被向上拉动和向下拉动，以使穿着者或护理者可容易地穿上该制品并在该制品被弄脏时可容易地将其脱除。还要求它们应该是柔软的和类似纺织品的。
裤型吸收制品通过例如WO 2005/122985而已知，其中底部部分由包含第一纤维材料层和第二纤维材料层以及位于其间的弹性膜层的弹性层合物构成。这种裤型制品是穿着平滑的且不连续的。
由于这些制品是一次性产品，因而成本方面非常重要。由于成本原因，制品中包含的材料层必须尽可能薄。同时，也必须满足品质和强度要求。更具体地说，所述制品必须结合对于使用者而言的舒适性和良好合身性与强度，从而使得所述制品是穿着舒适的且不连续的，但是当将其穿上时和在使用期间必须保持其完整性。裤型制品被暴露在相当大的应力下，特别是在将其穿上时。那些最容易受到应力和最有可能发生失效的区域是其中制品组件接合在一起的那些区域，即制品的接缝，特别是在后部连接前部的边缝。这些边缝通常通过超声熔接、热粘合或胶合(gluing)或它们的组合而形成。当裤制品在使用者的臀部上方被拉动时，所述裤制品被拉伸，其中边缝被暴露于很大的应力下。具有弹性层合物的前部和后部的裤型吸收制品(其中边缝通过将两个弹性层合物粘合在一起而形成)通常具有对于在制品的使用期间出现的应力而言不足的粘合强度。随着弹性层合物不断变薄和变软的趋势，该问题愈发严重。边缝可以或者通过将前部和后部的侧边缘部分的内表面重叠而形成，其中所述边缝将从弹性层合物的平面突出；或者通过将一个侧边缘部分的内表面接合到另一侧部分的外表面而以重叠的方式形成，其中所述边缝将与弹性层合物在同一平面内。
WO 2007/138373公开了一种裤型吸收制品，其包含弹性层合物，并且其中熔接缝通过增强在弹性层合物的内表面上施用的非织造材料带(strip)而被增强。
WO 2007/094706公开了一种裤型吸收制品，其包含弹性层合物，并且其中熔接缝通过在粘合之前将软化状态的纤维喷射到接缝中的至少一个网状(web)材料上而被增强。
WO 2013/167170公开了增强在包含弹性层合物的裤型吸收制品中的边缝，所述增强通过在边缝区域中折叠侧边部的非织造层本身以在所述边缝中提供附加层而进行。
发明内容
本发明的一个目的是提供一种包含弹性层合物的裤型吸收制品，其可以以容易且成本效益高的方式制造，同时提供所需的强度性质和柔软的纺织品感觉。本发明涉及引言中所提及类型的裤型吸收制品，其中弹性层合物的形成弹性层合物的面向穿着者的内侧的第一纤维层的基重为13～30g/m2，并且其中所述第一纤维层的基重比所述弹性层合物的第二纤维层的基重高10～300％，其中所述第一纤维层沿着所述边缝面对彼此。
第一纤维层和第二纤维层的基重是指用于制造弹性层合物的原始纤维材料的基重，而不是指在弹性层合物的制造期间已经经受粘合至弹性膜以及其它处理步骤之后的弹性层合物中的纤维层可具有的基重。
边缝可以通过超声熔接、热粘合、胶合或它们的组合而被提供。
第一纤维层和第二纤维层可以是选自以下的非织造材料：纺粘的、熔喷的、它们的混合物、粗梳的(carded)或水刺的。
第一纤维层和第二纤维层可以是相同类型的纤维材料，并且只有其基重不同。
弹性层合物可横向延伸穿过前部的宽度，并横向延伸穿过后部的宽度。
所述弹性层合物的形成弹性层合物的面向穿着者的内侧的第一纤维层的基重可以是至少15g/m2，优选为至少18g/m2。
第一纤维层的基重可以比弹性层合物的第二纤维层的基重高至少20％，优选至少25％。
第一纤维层的基重可以比弹性层合物的第二纤维层的基重高不超过200％。
弹性层合物可以是拉伸粘合的层合物。
附图说明
以下将参照附图更详细地描述本发明。
图1是裤型制品的示例说明性实施方案的示意性透视图。
图2是贯穿本发明的边缝的横截面图。
图3是用于试验将两个网状材料接合在一起的接缝的密封强度的试验程序的示意图。
具体实施方式
图1示出了一种裤型吸收制品，其旨在像一条内裤那样包围穿着者躯干的下部。本发明主要涉及一次性吸收制品，其是指在使用后不意欲被洗涤或被以其它方式恢复或被重新用作吸收制品的制品。本发明涉及裤型吸收制品，例如纸尿裤、卫生裤和失禁裤。
裤子1具有横向和纵向x和y，并且如在纵向y可见的那样，包括前部2、后部3和位于其间的裆部4。吸收芯5至少位于裆部4中并且可以延伸到前部2和/或后部3中。液体不透性后片(未示出)位于面向衣物侧的吸收芯5的下方。
前部2具有前横向边缘6以及第一纵向侧边缘和第二纵向侧边缘7和8。后部3具有后横向端边缘9以及第一纵向侧边缘和第二纵向侧边缘10和11。前部2和后部3通过超声熔接、热粘合、胶合线(glue string)等沿其各自的第一纵向侧边缘和第二纵向侧边缘而被彼此接合，以形成第一边缝和第二边缝12和13，并且界定出腰部开口14以及第一腿部开口和第二腿部开口15和16。形成边缝12和13的各纵向侧边缘7、8、10和11相邻的前部2和后部3的区域被称为侧边部17、18、19和20。
前部2的侧边部17、18与后部3的相应侧边部19、20以其内表面面对彼此的方式重叠，其中形成边缝12、13，其是从前部2和后部3的平面突出的类型的边缝。
裤子还可以包括固定到前部2和后部3的横向端边缘6和9的弹性腰带(未示出)。
裤子包括外覆盖物(cover)，其在包括侧边部17、18、19和20在内的至少部分前部2和后部3中是弹性的，并且包含弹性层合物21。弹性层合物21包含第一纤维层和第二纤维层22、23以及位于其间的弹性膜层24。弹性层合物21还可以包含层合到第一纤维层和/或第二纤维层上的一个或多个附加纤维层。这样的附加纤维层可以仅存在于弹性层合物21的部分中。因此，弹性层合物21在其整个面积上不必相同，而可以在不同区域中包含不同的层。
术语“弹性”是指材料能够受力延伸并且然后一旦移除力就能收缩回到其初始长度或向其初始长度收缩的材料。为了本发明的目的，“弹性”材料应具有至少30％的在至少一个方向上的通过本文中具体指定的弹性试验测量的弹性。在根据本发明的裤型吸收制品中使用的弹性层合物21应具有至少30％、优选至少50％、更优选至少70％的在制品的x方向上的通过本文中具体指定的弹性试验测量的弹性。
优选地，弹性层合材料21在制品的y方向上也具有弹性。然而，在y方向上的弹性优选地低于在x方向上的弹性。
术语“非弹性”是指未落入上面给出的“弹性”材料的定义的任何材料。
弹性层合物21可以覆盖包括裆部4以及整个前部2和后部3在内的整个制品。然而，在优选实施方案中，制品的相当大的部分或整个裆部4不含弹性层合材料21，其中在裆部中布置基本上无弹性的裆片(panel)材料。
弹性层合物21优选横向(laterally)延伸穿过位于第一侧边缘和第二侧边缘7和8之间的前部2的宽度，并横向延伸穿过位于第一侧边缘和第二侧边缘10和11之间的后部3的宽度。
有利的是，对外部纤维层进行选择，从而使得其与内部弹性膜层的组合赋予材料高抗穿刺性。它们还向层合物提供了柔软的和类似布料的感觉。合适材料的实例有粗梳网、水刺材料、纺粘材料、熔喷材料、纺粘-熔喷-纺粘的(SMS)材料、纺粘-熔喷的(SM)材料等。纤维材料层的基重将在下面论述。用于纤维材料中的合适聚合物的实例有聚乙烯、聚酯、聚丙烯以及其它聚烯烃均聚物和共聚物。也可以使用天然纤维，例如棉，只要它们可提供所需的性质即可。聚合物的混合物可以有助于非织造层的较高柔韧性，并且通过这种方式，赋予非织造材料在最大负载下更高的伸长率。已经证明，聚乙烯和聚丙烯聚合物的混合物在这方面提供了良好的结果。不同聚合物的纤维的混合物也是可能的。
弹性层合物的纤维层中的至少一个可以是起皱的非织造材料。起皱的非织造物将提高抗穿刺层合物的抗穿刺性，并且使其可经受在穿上和脱下裤制品时出现的拉拽力和拉伸力而不破裂和撕破。
中间层优选为透气弹性膜24，例如多孔的、单片的(monolithic)、有缝隙的(apertured)、穿刺的膜等，其基重为20～80g/m2，优选为20～60g/m2。该膜可以是任何合适的弹性聚合物，天然的或合成的。用于弹性膜的合适材料的一些实例有低结晶度聚乙烯；经茂金属催化的低结晶度聚乙烯；乙烯-乙酸乙烯酯共聚物(EVA)；聚氨酯；聚异戊二烯；丁二烯-苯乙烯共聚物；苯乙烯嵌段共聚物，例如苯乙烯/异戊二烯/苯乙烯(SIS)、苯乙烯/丁二烯/苯乙烯(SBS)或苯乙烯/乙烯-丁二烯/苯乙烯嵌段共聚物。还可以使用这些聚合物的共混物以及其它改性弹性体或非弹性体材料。合适的膜的一个实例是PE-SEBS-PE的有缝隙的三层弹性体膜。
层合物的总基重优选为100g/m2以下，更优选为不超过90g/m2。
在一个实施方案中，第一层纤维材料和第二层纤维材料已经在处于拉伸状态时被粘合到弹性膜层上，即所谓的拉伸粘合。所述粘合将通过粘合剂、超声熔接等方式进行。所得到的层合物将是可弹性拉伸的。
WO 2012/036599公开了一种拉伸粘合的弹性层合物，其中至少一个非织造层被以包含多个粘合元件的粘合图案粘合到弹性膜层上。弹性膜层在粘合期间被拉伸。在接近至少一些粘合元件的膜层中形成缝隙(aperture)。
WO 2012/036600是拉伸粘合的弹性层合物的另一个实例，其包含至少一个非织造层，该非织造层在将弹性膜保持在拉伸条件下时被以粘合图案粘合到弹性膜层上。
WO 2010/104429公开了拉伸粘合的弹性层合物的另一实例，其中将弹性膜在层合到至少一个非织造层的期间加热并拉伸。
WO 2013/002691公开了弹性层合物的拉伸粘合，其中将弹性膜在将其层合到至少两个非织造网状物之前在至少两个拉伸步骤中进行拉伸。
将弹性层合材料21优选布置作为在前部2和后部3的至少一部分上的外覆盖片材料和内覆盖片材料。弹性层合材料可以构成占制品总表面积的至少20％、优选至少25％、更优选至少30％、最优选至少40％的前部和后部的唯一组分。
包含弹性层合物的纸尿裤的实例的更详细描述可见于WO2005/122985中，其全部公开内容相应地通过援引加入的方式纳入本文，只要其中的描述不与本文的描述相抵触即可。
弹性层合材料21之间的粘合，例如边缝12和13中的粘合，有时可能是不足的，特别是对于薄层合物而言。当将裤子拉过穿着者的臀部以及还有在制品的使用期间，边缝12和13被施加以相当大的应力。这些边缝中的粘合通常通过超声熔接或热粘合实现，其中形成粘合图案。或者，粘合通过胶合或胶合与超声熔接或热粘合的组合来实现。
已经有一个确定的观点，即接缝(例如超声熔接缝)中聚合物材料的总量对粘合强度有贡献。因此，粘合强度将仅由接缝中的弹性层合材料和接缝区域中所添加的任选存在的附加材料的基重决定。
根据本发明，这种已接受的观点是与事实相悖的(contradicted)，因为示出了弹性层合物中的内外非织造层22和23的基重之间的关系影响了接缝中的粘合强度。下面给出的实施例显示，通过使第一非织造层和第二非织造层22和23具有不均匀的(non-uniform)基重，当形成面对接缝中另一弹性层合物的内层的内层的第一非织造层22具有比外第二非织造层23更高的基重时，尽管总基重相同，但粘合强度将高于通过使第一非织造层和第二非织造层22和23具有均匀(uniform)基重的情况。
第一非织造层和第二非织造层22和23可以是相同类型的非织造材料，并且只有其基重不同。
形成内层的第一非织造层22的基重可以在13～30g/m2范围内，优选至少15g/m2，更优选至少18g/m2，并且比形成弹性层合物的外层的第二纤维层23的基重高10～300％。优选地，第一非织造层的基重比第二非织造层的基重高至少20％，更优选高至少25％。第二非织造层23的基重可以在10～27g/m2范围内。
第一非织造层和第二非织造层22和23的基重是指用于制造弹性层合物的原始非织造材料的基重，而不是指在弹性层合物的制造期间已经经受粘合至弹性膜和其它处理步骤之后的弹性层合物中的非织造层可具有的基重。对于拉伸粘合的弹性层合物而言，当经拉伸的膜松弛时，非织造层将收缩，因此具有比原始非织造材料更高的基重。
因此，简单地通过以上述方式选择具有不同基重的形成层合物内层和外层的非织造层，对于具有给定基重的弹性层合物而言，可以获得接缝区域中更高的粘合强度。弹性层合物的总基重保持不变，因此材料成本保持不变。
弹性膜的基重也是指用于制造弹性层合物的原始弹性膜的基重，而不是指在弹性层合物的制造期间已经经受拉伸和粘合至非织造层以及其它处理步骤之后的弹性层合物中的弹性膜可具有的基重。
实施例
试验了总基重为58g/m2的两个弹性层合物：具有以下材料布置的层合物A和B：
层合物A：非织造物18g/m2+弹性膜22g/m2+非织造物18g/m2。
层合物B：非织造物20g/m2+弹性膜22g/m2+非织造物16g/m2。
非织造层是聚丙烯(PP)的纺粘非织造网状物，弹性膜是热塑性聚氨酯膜。膜的每一侧均具有经超声层合至表面的非织造层。弹性层合物是拉伸粘合型的，其中将在未拉伸状态下原始基重为22g/m2的弹性膜拉伸约180％，并且将其粘合到具有上述基重的非织造层上。
层合物A在弹性膜的两侧具有均匀基重的两个非织造层，而层合物B具有不均匀基重的两个非织造层。在试验中，将相同类型的两个弹性层合物经超声熔接在一起，例如在裤制品中的边缝中，如图2所示。对于层合物A(均匀的层合物)，具有相同基重(即18g/m2)的两个非织造层在接缝中向内面对彼此。对于层合物B(不均匀的层合物)，制造两种类型的接缝，其中在第一接缝中，具有较低基重16g/m2的非织造层在接缝中向内面对彼此；在第二接缝中，具有较高基重20g/m2的非织造层在接缝中向内面对彼此。
熔接中使用的超声能对于所有接缝是相同的。
根据下述的密封强度试验测量剥离(delaminate)边缝所需的力。
得到以下结果。
层合物A(均匀)：19.5N/25mm
层合物B(不均匀，其中16g/m2非织造物向内面对)：17N/25mm
层合物B(不均匀，其中20g/m2非织造物向内面对)：20.5N/25mm。
令人惊奇的是，尽管熔接缝中聚合物材料的总量相同，但是三个样品的边缝强度却不相同。具有在接缝中面对彼此的具有较高基重的非织造层的不均匀层合物的接缝比均匀层合物的接缝更强，并且比具有在接缝中面对彼此的具有较低基重的非织造层的不均匀层合物的接缝更强。
密封试验
该方法测量通过例如胶合、熔接或热粘合而接合在一起的两种材料之间的密封强度。
参考图3，制备包含将两个材料网状物27、28接合在一起的接缝26的样品带25，其中所述接缝26在样品带25的中心位置处从样品带25的平面突出。样品的宽度为25mm，长度为70mm。使用拉伸试验机，其具有一对宽度为25mm的夹具29，所述夹具之间的距离为50mm。将样品带25固定在拉伸试验机中，其中所述带的横向端处于各自的夹具中。样品带25被布置成使得接缝26与所述带成90°的角度，如图3所示。
以300mm/分钟的十字头速度开始拉拽，并且当材料网状物27和28沿接缝26分离时，停止拉拽。
弹性试验
该方法测量弹性材料在重复的加载和卸载循环中如何表现。将样品拉伸至预定伸长率，并执行0和所述预定伸长率之间的循环移动。记录所需的加载力和卸载力。测量松弛材料的持久(即，余留)伸长率。
使用能够执行循环移动并配备有打印机/绘图仪或软件显示(presentation)的拉伸试验仪Lloyd LRX。样品通过以下方式制备：将样品切割成宽度为25mm且长度优选比拉伸试验仪中夹具之间的距离长20mm。
将拉伸试验仪根据仪器使用说明进行校准。将试验所需的参数(加载力和卸载力)调节至：
·十字头速度：500mm/分钟
·夹具距离：50mm
·预载：0.05N
将样品根据标记放置在夹具中，并确保该样品居中并被垂直固定在夹具中。启动拉伸试验仪，并执行三个在0和预定伸长率之间的循环。在最后一个循环之前，将样品松弛1分钟，然后通过以下方式测量持久伸长率：将样品拉伸直至检测到0.1N的力并读取伸长率。
松弛后的持久伸长率应小于10％，并通过上述方法测定。因此，30％的弹性被定义为：在上述拉伸试验仪中被施以30％的伸长后，层合物应具有小于10％的伸长后持久松弛。30％的伸长率是指伸长至比样品的初始长度长30％的长度。
非弹性材料被定义为在经受30％的伸长之后具有10％以上的松弛后持久伸长率的材料。

Claims (10)

1.裤型吸收制品(1)，其包括前部(2)、后部(3)和裆部(4)，其中所述前部(2)和后部(3)的侧边部(17，18；19，20)重叠，使得它们的内表面面对彼此并且沿着边缝(12，13)彼此接合以界定所述裤型制品的腰部开口(9)和一对腿部开口(15，16)，并且其中所述前部(2)和所述后部(3)中的至少一部分，包括所述侧边部(17，18；19，20)在内，包含弹性层合物(21)，所述弹性层合物包含第一纤维层和第二纤维层(22，23)以及位于其间的弹性膜层(24)，其特征在于，所述弹性层合物(21)的形成弹性层合物的面向穿着者的内侧的所述第一纤维层(22)的基重为13～30g/m2，并且所述第一纤维层(22)的基重比所述弹性层合物的所述第二纤维层(23)的基重高10～300％，其中第一纤维层(22)沿着所述边缝(12，13)面对彼此。
2.如权利要求1所述的裤型吸收制品，其特征在于，所述边缝(12，13)通过超声熔接、热粘合、胶合或它们的组合而被提供。
3.如权利要求1或2所述的裤型吸收制品，其特征在于，所述第一纤维层(22)是选自以下的非织造材料：纺粘的、熔喷的、粗梳的、水刺的、纺粘-熔喷-纺粘的(SMS)和纺粘-熔喷的(SM)。
4.如权利要求3所述的裤型吸收制品，其特征在于，所述第二纤维层(23)是选自以下的非织造材料：纺粘的、熔喷的、水刺的、粗梳的、纺粘-熔喷-纺粘的(SMS)和纺粘-熔喷的(SM)。
5.如前述权利要求中任一项所述的裤型吸收制品，其特征在于，所述第一纤维层和第二纤维层(22，23)是相同类型的纤维材料，并且只有其基重不同。
6.如前述权利要求中任一项所述的裤型吸收制品，其特征在于，所述弹性层合物(21)横向延伸穿过所述前部(2)的宽度，并横向延伸穿过所述后部(3)的宽度。
7.如前述权利要求中任一项所述的裤型吸收制品，其特征在于，所述弹性层合物(21)的形成弹性层合物的面向穿着者的内侧的所述第一纤维层(22)的基重是至少15g/m2，优选为至少18g/m2。
8.如前述权利要求中任一项所述的裤型吸收制品，其特征在于，所述第一纤维层(22)的基重比所述弹性层合物的所述第二纤维层(23)的基重高至少20％，优选至少25％。
9.如权利要求8所述的裤型吸收制品，其特征在于，所述第一纤维层(22)的基重比所述弹性层合物的所述第二纤维层(23)的基重高不超过200％。
10.如前述权利要求中任一项所述的裤型吸收制品，其特征在于，所述弹性层合物是拉伸粘合的层合物。
CN201580075697.1A 2015-02-09 2015-02-09 裤型吸收制品 Pending CN107205870A (zh)

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