CN102008375B - 包括具有无材料区的吸收芯层和设于吸收芯层下面的转移层的吸收制品 - Google Patents

包括具有无材料区的吸收芯层和设于吸收芯层下面的转移层的吸收制品 Download PDF

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Publication number
CN102008375B
CN102008375B CN201010276475.5A CN201010276475A CN102008375B CN 102008375 B CN102008375 B CN 102008375B CN 201010276475 A CN201010276475 A CN 201010276475A CN 102008375 B CN102008375 B CN 102008375B
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China
Prior art keywords
absorbent
transfer layer
absorbent cores
material sections
absorbent article
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Expired - Fee Related
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CN201010276475.5A
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English (en)
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CN102008375A (zh
Inventor
K·比沙
P·戴维斯
F·J·V·赫南德兹
F·W·帕克斯
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Johnson and Johnson Industrial Ltda
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Johnson and Johnson Industria e Comercio Ltda
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    • A61F13/53—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 absorbing medium
    • A61F2013/530868—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 absorbing medium characterized by the liquid distribution or transport means other than wicking layer
    • A61F2013/530875—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 absorbing medium characterized by the liquid distribution or transport means other than wicking layer having holes

Abstract

本发明整体涉及吸收制品，具体地讲涉及包括下列部分的吸收制品：液体可透过的覆盖层、液体不可透过的阻挡层、邻近所述覆盖层布置的吸收芯、布置在所述吸收芯和所述阻挡层之间的转移层，所述吸收芯包括上表面和下表面以及从所述上表面向所述下表面延伸的无材料区。

Description

包括具有无材料区的吸收芯层和设于吸收芯层下面的转移层的吸收制品
技术领域
本发明整体涉及吸收卫生巾，具体地讲涉及具有卓越的横向和纵向芯吸特性以及优良的液体渗透时间和回渗性质的卫生巾。
背景技术
为了让卫生巾在使用过程中有效吸收大量液体，必须让卫生巾的整个吸收结构有效芯吸液体。当缺乏有效芯吸性质时，月经液体容易集中在卫生巾的某些区域，导致卫生巾的总吸收容量不能被充分利用。因此，本发明的发明人认识到，有必要提供一种卫生巾，该卫生巾能在卫生巾的纵向和横向有效芯吸液体，从而充分利用卫生巾的总吸收容量，同时又能提供优良的液体渗透时间和回渗性质。
发明内容
鉴于上述原因，根据本发明的第一方面，本发明提供了吸收制品，其包括纵向延伸的中心线、横向延伸的中心线、具有面向身体的表面的液体可透过的覆盖层、液体不可透过的阻挡层、邻近覆盖层布置的吸收芯、布置在吸收芯和阻挡层之间的转移层，其中吸收芯包括上表面和下表面以及从上表面向下表面延伸的无材料区，覆盖层包括与转移层以间隔关系布置的第一区域和与转移层以表面对表面接触关系布置的第二区域。
根据本发明的第二方面，本发明提供了吸收制品，其包括纵向延伸的中心线、横向延伸的中心线、具有面向身体的表面的液体可透过的覆盖层、液体不可透过的阻挡层、邻近覆盖层布置的吸收芯、布置在吸收芯和阻挡层之间的转移层，其中吸收芯包括上表面和下表面，并且包括多个桁条和多个无材料区，并且其中每个桁条与相邻桁条以间隔关系布置，且每个桁条与相邻桁条之间被无材料区隔开，每个无材料区从上表面延伸至下 表面，覆盖层包括多个与转移层以间隔关系布置的第一区域和多个第二区域，每个第二区域都位于两相邻桁条之间，并且与转移层以表面对表面接触关系布置。
附图说明
现将参照附图描述本发明实施例的实例，附图中：
图1为根据本发明的吸收制品的顶部透视图；
图2为图1所示吸收制品的底部透视图；
图3为根据本发明的第一实施例的图1所示吸收制品的分解图；
图4为沿图1的4-4线截取的图1所示吸收制品的剖视图；
图5为示意性地示出制品内的液流路径的图1所示吸收制品的局部剖切透视图；
图6为根据本发明的第二实施例的图1所示吸收制品的分解图；
图7为沿图6的7-7线截取的图6所示吸收制品的剖视图；
图8为根据本发明的第三实施例的吸收制品的顶部透视图；
图9为图8所示吸收制品的分解图；
图10为沿图8的10-10线截取的图8所示吸收制品的剖视图；
图11为用于测量吸收制品的纵向芯吸值(LWV)、横向芯吸值(TWV)和液体渗透时间(FPT)的测试板的顶部正视图；以及
图12为示出根据本发明的有污渍的吸收制品以及纵向芯吸值(LWV)和横向芯吸值(TWV)测量方式的示意图。
具体实施方式
本发明整体涉及一次性吸收制品，例如卫生巾、短裤护垫、用于大小便失禁的吸收产品和紧贴佩戴者身体佩戴的其他一次性吸收制品之类的制品。虽然本文中将参照卫生巾描述本发明，但本发明可用于其他一次性卫生吸收制品，例如用于大小便失禁的吸收产品、尿布、短裤护垫等。
根据本发明的吸收制品提供了卓越的液体处理特性，更具体地讲提供了卓越的纵向和横向芯吸特性，以及优良的液体渗透时间和回渗性质。
如图1-4所示，本发明涉及用于吸收体液的卫生巾10。卫生巾10包括面向身体的表面11、面向衣服的表面13、纵向延伸的中心线15和横向延伸的中心线17。
如图3中的分解图最清楚显示的，卫生巾10包括液体可渗透的覆盖层12、吸收芯14、转移层16和液体不可渗透的阻挡层18。如图3所示，吸收芯14邻近覆盖层12布置，转移层16布置在吸收芯14和阻挡层18之间。
吸收芯14包括不含任何吸收材料的无材料区20。无材料区20从吸收芯14的上表面19延伸至吸收芯14的下表面21。无材料区20可使用任何已知的方法(例如切割等)形成。在图1-4所示的本发明的具体实施例中，无材料区20相对于纵向延伸的中心线15和横向延伸的中心线17居中对齐。在图1-4所示的本发明的具体实施例中，无材料区20的形状基本上为椭圆形，并且优选地具有沿纵向延伸的中心线15测量的在约40mm至约160mm之间范围内的长度，以及沿横向延伸的中心线17测量的约10mm至约60mm的宽度。无材料区20优选地在400mm2和约6000mm2之间范围内的表面积上延伸。
如图4中最清晰示出，覆盖层12包括位于无材料区20以外区域并且与转移层16以间隔关系布置的第一区域22，覆盖层还包括位于由无材料区20限定的区域内并且与转移层16以表面对表面接触关系布置的第二区域24。覆盖层12与转移层16的表面对表面接触基本限定了在卫生巾10的面向身体的表面11内的沟槽29。吸收芯14优选地具有在约0.5mm和约20mm之间的厚度。沟槽29的深度在约0.5mm和约20mm之间。此段落中给出的厚度和深度测量值可用合适的厚度计(例如Mitutoyo绝对厚度计或类似物)确定。
参见图5，图中示出了液体在根据本发明的卫生巾10的吸收结构内传递的方式。如图所示，转移层16直接接纳来自无材料区20区域内的覆盖层12的液体。转移层16接着沿卫生巾的纵向和横向芯吸液体，直到液体可以向上传递并被吸入吸收芯14中。
参见图6，图中示出了根据本发明的第二实施例的卫生巾10a的分解图。卫生巾10a的结构类似于上述卫生巾10，但还包括布置在第一吸收芯 14和转移层16之间的第二吸收芯26。如图所示，第二吸收芯26包括无材料区28，该无材料区28在尺寸和形状上与第一吸收芯14的无材料区20相对应。无材料区28从第二吸收芯26的上表面35向第二吸收芯26的下表面37延伸。
参见图7，覆盖层12包括位于无材料区20和28的区域外并且与转移层16以间隔关系布置的第一区域22，该覆盖层还包括位于无材料区20和28的区域内并且与转移层16以表面对表面接触关系布置的第二区域24。覆盖层12与转移层16的表面对表面接触基本限定了在卫生巾10的面向身体的表面内的沟槽29。第一吸收芯14和第二吸收芯28优选地各具有在约0.5mm和约20mm之间的厚度。每个沟槽29的深度都在约1.0mm和约40mm之间。
参见图8-10，图中示出了根据本发明的第三实施例的卫生巾10b。如图9所示，卫生巾10b包括液体可渗透的覆盖层12、吸收芯14、转移层16和液体不可渗透的阻挡层18。如图9所示，吸收芯14邻近覆盖层12布置，转移层16布置在吸收芯14和阻挡层18之间。
如图9的分解图中最清晰示出，吸收芯14包括多个纵向延伸的无材料区20，这些无材料区从吸收芯14的上表面19向吸收芯14的下表面21延伸。每个无材料区20都优选地具有在1mm和约10mm之间范围内的宽度以及在约50mm和约250mm之间范围内的长度。根据本发明的第三实施例的吸收制品优选地具有在约2个和约7个之间的纵向延伸的无材料区20。每个无材料区20都在横向与相邻无材料区20间隔约5mm至约30mm。每个无材料区20都优选地在约50mm2和约4000mm2之间的表面积上延伸。在图8-10所示本发明的具体实施例中，无材料区20具有彼此平行且等间距的直线形状。
吸收芯14还包括多个纵向延伸的桁条25，每个桁条25都与相邻桁条25布置成间隔关系，并且每个桁条25与相邻桁条25之间用其中一个无材料区20隔开。
如图10中最清晰示出，覆盖层12包括与转移层16以间隔关系布置的多个第一区域22以及与转移层16以表面对表面接触关系布置的多个第二区域24。
覆盖层12与转移层16在第二区域24内的表面对表面接触基本限定了在卫生巾10的面向身体的表面11内的多个纵向延伸的沟槽29，这些沟槽与无材料区20的路径共同延伸。吸收芯14优选地具有在约0.5mm和约20mm之间的厚度。每个沟槽29的深度在约0.5mm和约20mm之间。
虽然图中未示出，但卫生巾10b可以设有布置在第一吸收芯14和转移层16之间的第二吸收芯，第二吸收芯包括多个无材料区，其形状和尺寸与第一吸收芯14的无材料区相同。
虽然图中未示出，但沟槽29所在的卫生巾区域的着色可以与吸收制品的其余部分不同。例如，沟槽29所在区域可以着成蓝色，而卫生巾的其余部分大致为白色。通过将沟槽29与卫生巾的其余部分着成不同颜色，可以将沟槽29所提供的增强的芯吸特性直观地展示给吸收制品的潜在使用者。可以通过向覆盖层12和/或转移层16和/或阻挡层18提供颜色(例如印色)而赋予卫生巾颜色。
覆盖层
覆盖层12可以为具有较低密度的大体积高蓬松非织造纤维网材料。覆盖层12可以仅由聚酯或聚丙烯之类的一种纤维构成，或者也可以包括一种以上纤维的混合物。覆盖层可由具有低熔点组分和高熔点组分的双组分或组合纤维构成。纤维可以选自多种天然和合成材料，例如尼龙、聚酯、人造丝(与其他纤维结合)、棉花、丙烯酸纤维等以及它们的组合。优选地，覆盖层12具有在约10gsm至约75gsm范围内的基重。
双组分纤维可由聚酯层和聚乙烯外皮构成。通过使用合适的双组分材料可以得到热熔的非织造织物。此类热熔织物的实例在1985年11月26日授予Chicopee的美国专利No.4,555,430中有所描述。通过使用热熔织物，可以更方便地将覆盖层装到制品的吸收层和/或阻挡层上。
覆盖层12优选地具有相对较高的润湿性，然而构成覆盖层的各种纤维也可以不具有特别的亲水性。覆盖材料还应包含大量较大的孔。这是由于覆盖层12用来快速吸收体液并将体液从身体和析出点转移走。因此，覆盖层几乎不增加卫生巾吸收特定量的液体所需的时间(渗透时间)。
有利地，构成覆盖层12的纤维在变湿时不应丧失其物理特性，换句话讲，当遇到水或体液时，纤维不应皱缩或失去回弹力。覆盖层12可经 过处理，以让液体能够容易地从中通过。覆盖层12还起到将液体快速转移至卫生巾下面的层的作用。因此，覆盖层12有利地具有可润湿、亲水和多孔的特性。当覆盖层12由聚酯或双组分纤维之类的合成疏水纤维构成时，其可用表面活性剂处理，以获得所需的润湿度。
作为另外一种选择，覆盖层12可由具有大孔的聚合物薄膜构成。由于这种较高的孔隙度，薄膜起到将体液快速转移至下面的吸收层的作用。在由McNeil-PPC，Inc.经销的娇爽干爽超薄(STAYFREE Dry MaxUltrathin)产品中可以见到此类合适的覆盖材料。
覆盖层12可通过粘合和/或本领域的技术人员已知的其他适当方式附接到下面的吸收芯14、转移层16和/或阻挡层18上。
吸收芯
在一个实施例中，吸收芯14为纤维素纤维和设置在其中的超吸收剂的共混物或混合物。可用于吸收芯14的纤维素纤维是本领域熟知的，并且包括木浆、棉花、亚麻和泥煤苔藓。其中以木浆为优选。木浆可得自基于机械或化学-机械处理的亚硫酸盐牛皮纸浆、制浆丢弃材料、有机溶剂纸浆等。软木和硬木浆都可以使用。其中以软木浆为优选。不必为了在本发明的材料中使用而用化学松解剂、交联剂等对纤维素纤维进行处理。纸浆的一些部分可以按照美国专利No.5,916,670中所述方式进行化学处理，以提高产品的柔韧性。也可以通过机械处理材料或软化材料来增强材料的柔韧性。
吸收芯14可以包含本领域熟知的任何超吸收聚合物(SAP)。就本发明而言，术语“超吸收聚合物”(或“SAP”)是指在0.5psi的压力下能够吸收和保持至少约10倍于其重量的体液的材料。本发明的超吸收聚合物颗粒可以为无机或有机交连亲水性聚合物，例如聚乙烯醇、聚环氧乙烷、交连淀粉、瓜耳胶、黄原胶等。该颗粒可以具有粉末、细粒、颗粒或纤维形式。本发明使用的优选超吸收聚合物颗粒为交连聚丙烯酸酯，例如Sumitomo Seika Chemicals Co.，Ltd.(Osaka，Japan)以商品名SA70N供应的产品和Stockhausen Inc.供应的产品。在一具体实例中，吸收芯为包含95重量％至约40重量％纤维素纤维和约5重量％至约60重量％SAP的材料。
在本发明的一个具体实施例中，吸收芯14由可以商品名RAYFLOC J-LD-E购自Rayonier Products(Jessup，Georgia)的绒毛浆和可以商品名SA70N购自Sumitomo Seika Chemicals Co.，Ltd.(Osaka，Japan)的超吸收聚合物的混合物，该混合物包含94重量％的绒毛浆和6重量％的超吸收聚合物。
尤其适用于吸收芯的材料优选地具有在约300gsm(g/m2)至1000gsm范围内的基重、在约0.5mm至20mm范围内的厚度和在约0.015g/cc至2g/cc范围内的密度。
转移层
与阻挡层18内侧相邻的是转移层16。转移层的作用是接纳来自覆盖层12的体液，并保持体液直到吸收芯14有机会吸收该体液，因此可充当液体转移或采集层。此外，转移层16用来在卫生巾纵向和横向芯吸液体，以充分利用卫生巾的总吸收容量。
转移层16优选地具有比覆盖层12更大比例的更小的孔。这些属性使转移层16能够容纳体液并使体液远离覆盖层12外侧，从而防止体液回渗到覆盖层12以及其表面。
转移层16可由纤维材料构成，例如木浆、聚酯、人造丝、柔性泡沫等或它们的组合。优选地，转移层16不含任何超吸收聚合物(SAP)。转移层16也可以包含热塑性纤维，以用来稳定层并保持其结构完整性。转移层16可以用表面活性剂在一个或两个侧面上进行处理，以增强其润湿性，但转移层16通常是相对亲水的，并且也不需要处理。转移层16优选地在两侧结合于相邻层(即吸收芯14和阻挡层18)。
发明人发现有助于缩短渗透时间的、尤其适用于本发明的转移层16的材料，具有在约0.04至0.05g/cc范围内的密度、在约80至110g/m2范围内的基重和在约1至3mm范围内的厚度。适用于第一吸收层的材料的实例为购自BUCKEYE(Memphis，Tenn.)的商品名为VIZORB 3008的透气结合纸浆(该纸浆具有110g/m2的基重)和商品名为VIZORB 3010的透气结合纸浆(该纸浆具有90g/m2的基重)。
阻挡层
转移层16下面是阻挡层18，其具有液体不可透过的薄膜材料，以防液体流出卫生巾并弄脏使用者的内衣。阻挡层18优选地由聚合物薄膜制成，但也可以液体不可透过、空气可透过的材料制成，例如用拒斥剂处理过的非织造或微孔薄膜或泡沫。
阻挡层18可以是透气的，即允许蒸汽排出的。用于阻挡层的已知材料包括非织造材料和微孔薄膜，后者的微孔性通过(特别是)拉伸取向薄膜而形成。也可以使用提供曲折通道和/或其表面特性造成可防止液体渗透的液体表面的单层或多层可渗透薄膜、织物、熔喷材料以及它们的组合，以形成可透气底片。覆盖层12和阻挡层18优选地沿其边界部分接合，以形成可维持转移层16和吸收芯14具阻拦能力的腔体或凸缘密封。可通过粘合剂、热粘合、超声焊接、射频密封、机械卷曲等方式以及这些方式的组合来实现这种接合。
使用时可以将定位粘合剂施加到阻挡层18的面向衣服的表面13，以将卫生巾10固定到衣服上。如图2所示，可以用可移除的防粘纸40覆盖定位粘合剂，以使得定位粘合剂在使用前被可移除的防粘纸40覆盖。
本发明的吸收制品可以包括或不包括用以将吸收制品固定到内衣上的护翼、翼片或突出部。除了别的称呼以外，护翼也称为翼片或突出部，其在卫生保护制品中的用途在下列专利中有所描述：授予Van Tilburg的美国专利No.4,687,478、授予Van Tilburg的美国专利No.4,589,876、授予McCoy的美国专利No.4,900,320和授予Mattingly的美国专利No.4,608,047。这些专利的全部公开内容以引用方式并入本文中。如上述专利所公开的，护翼一般而言是柔性的并且构成为可折叠到内衣边缘，从而将护翼设置在内衣边缘之间。
测试程序
根据本发明的吸收制品具有一组独特的功能特性。下文给出的测试程序突出了每一项这类功能特性。在进行下文所述任何测试步骤之前，应将被测试产品在21+/-1℃和50+/-2％湿度下适应两个小时。
纵向芯吸值(LWV)和横向芯吸值(TWV)的测试程序
根据本发明的吸收制品在制品纵向和横向呈现优良的芯吸特性。下文给出的纵向芯吸值(LWV)和横向芯吸值(TWV)测试显示，根据本发明的吸收制品具有优良的芯吸特性。
根据本发明的吸收制品优选地具有大于60、更优选地具有大于70、最优选地具有大于75的LWV。根据本发明的吸收制品优选地具有大于35、更优选地具有大于40、最优选地具有大于45的TWV。
下述测试方法中使用下述的合成测试液。由于其易于制备并且容易获得原料，因此用合成测试液代替人的经血。
将每种下列组分溶于蒸馏水中，以制备测试液。应当用心制备，以确保组分充分溶解。应使用旋桨搅拌器或磁力搅拌器混合组分。在足够大的容器内加入下列组分，在加入下一组分前确保前面的组分已溶解：
确定LWV和TWV所需的材料包括下列几种：
·图11所示的聚甲基丙烯酸甲酯(树脂玻璃)模板200，其具有200mm长×60mm宽×12.7mm厚的尺寸和位于模板中心处的椭圆形孔202(30.8mm×19mm)；
·具有50mL组合注射器(或组合针头)的经校准电子重复取样器(HandyStep电动型连续式分注器(HandyStep ElectronicRepeating Pipet)，Brandtech)，注射器能够以约4mL/s的速率递送5-10mL液体并固定在支座上，并使针头末端垂直置于距产品表面25.4mm(1英寸)处；
·精度为0.01s的已校准秒表；
·刻度为毫米(mm)的直尺；
·细尖耐久记号笔；以及
·按照上述程序制备的测试液。
为获得LWV和TWV，将适应环境后的制品从其包装取出、展开并将其置于平坦表面(例如试验台)上。将树脂玻璃板200置于吸收产品上并对齐中线，用手轻压以使制品平坦而不被压缩，使得制品在模板200下基本不弯曲或折叠。
将置于重复取样器上的50mL组合注射器(或组合针头)注满测试液，垂直安置并固定在支座上，使得针头末端置于距产品表面大约1英寸并且位于模板椭圆形孔202中心之上的位置。制品的布置方式应使得纵向延伸中心线和横向延伸中心线的交点位于孔202中心处。然后，以约4mL/s的速率将10mL测试液击射在制品上。分配液体的重复取样器按钮一被按下，就立即打开秒表。60s后，移除模板，用记号笔迅速(10s以内)标出沿纵向延伸轴线和横向延伸轴线的污斑界限。只标出制品覆盖层上发现的连续液体污斑界限，确定芯吸距离时不考虑不连续或连接到其余液流和/或在吸收产品下层观察到的液体斑点。利用沿纵向延伸和横向延伸轴线可见的最远连续点可以绘出图12所示的矩形。纵向测得的矩形长度为LWV，横向测得的矩形长度为TWV。
因此，纵向芯吸值为沿制品的纵向延伸中心线15的最远连续液体位移，横向芯吸值为沿制品的横向延伸中心线17的最远连续液体位移。所有距离值都用精度为1mm的直尺测得。
如果在注入液体后60s内测试液横向接触或流出模板200的边缘，则认为样品测试失败，并将零(0)TWV赋予该样品。如果被测吸收制品小于测试板200，则在液体横向到达吸收制品边缘时确定失败。
每类吸收制品使用三个不同的样品按上述程序重复测试5次，并根据这三次重复计算平均LWV和TWV。如果5个产品中的任一个失败，即液体到达测试板边缘，则记写的平均TWV为零(0)。
测量液体渗透时间(FPT)的程序
根据本发明的吸收制品优选地具有小于10s、更优选地具有小于8s、最优选地具有小于5s的液体渗透时间。
如图11所示，将待测样品置于模板200下方以测量液体渗透时间。将模板200布置在产品样品上，使得椭圆形孔的中心与产品的纵向延伸中心线15和横向延伸中心线17的交点对齐。椭圆形孔的纵向轴线与待测产 品的纵向轴线对齐。利用具有上述配方的测试液作为液体渗透时间的测试液。
将含有7ml测试液的带刻度的10ml注射器保持在孔板上方，使得注射器出口位于孔上方约3英寸处。水平固定注射器，并让其平行于测试板表面。然后将液体以允许液体在垂直于测试板的液流内流入孔中的速率推出注射器，并且在液体首次触及待测样品时启动秒表。当在孔内的剩余液体的上方首次看到样品表面的一部分时，停止秒表。秒表走过的时间即为液体渗透时间。根据三个产品样品的平均值计算平均液体渗透时间(FPT)。
测量回渗度的程序
根据本发明的吸收制品优选地具有小于1.0g、更优选地具有小于0.6g的回渗度。
利用上述液体渗透时间(FPT)测试程序中使用的三个产品样品进行下述回渗度测试。
回渗度是一项指标，用来衡量卫生巾或其他制品在包含较大数量液体并承受外部机械压力的情况下将液体保持在其结构内的能力。回渗度通过下列程序确定和定义。
用于测试回渗度的装置与上文提出的液体渗透时间测试所描述的相同，并且还包括下列物品：3英寸×4英寸的矩形Whatman 1号滤纸(Whatman Inc.，Clifton，NJ)、测量精度+/-0.001g的称重机或天平、某一数量的所述Whatman滤纸、尺寸51mm(2英寸)×102mm(4.0英寸)×约54mm(2.13英寸)的2.22kg(4.8磅)标准砝码，其中砝码在51mm×102mm(2英寸×4英寸)的表面上施加4.14kPa(0.6psi)的压力。
为了进行本文所述的测试程序，应使用液体渗透测试中使用的三个相同的产品样品进行回渗度测试。将测试液施加到上述液体渗透时间测试中的孔板内之后，卫生巾覆盖层刚开始显得透过液体的上表面，就启动秒表并每隔5分钟测量一次。
5分钟后，移除孔板并且覆盖层向上地将卫生巾置于硬的水平面上。
在潮湿区域上方放置预先称重的十五(15)层滤纸叠堆并对正中心，然后在滤纸上面放上2.22kg的标准砝码。滤纸和砝码在吸收制品上的位置 应使其处于施加液体的区域的中央。滤纸和砝码的布置方式使得其较长尺寸与产品的纵向对齐。将滤纸和砝码置于产品上之后，立即启动秒表，经过3分钟后，迅速移除标准砝码和滤纸。测量并记录滤纸的潮湿重量，精确到0.001克。然后计算回渗值，即15层湿滤纸和15层干滤纸的重量差，单位为克。
测量应至少重复三次，且必要时应在每次测量前擦干砝码。然后根据三个测量值计算平均回渗值(R)。
实例
发明实例
根据本发明的卫生巾的发明实例构造如下。
覆盖层为基重16gsm(聚丙烯纤维)的热粘结非织造覆盖物，可从Polystar以产品代码142250商购获得。使用可从Bostik-Findley以产品代码H-2900商购获得的结构粘合剂对覆盖层面向芯的表面进行处理。5.0gsm的粘合剂被施加到95mm×230mm的覆盖层部分上。覆盖层的经过处理的一侧置于吸收芯上面。吸收芯由图1所示类型的无材料区构成，其具有沿制品的横向延伸中心线测量的30mm宽度和沿制品的纵向延伸中心线测量的100mm长度。无材料区在2305.91mm2的表面积上延伸。吸收芯具有5.5mm的厚度。由无材料区限定的沟槽具有4.4mm的深度。吸收芯由可从Georgia Pacific以产品代码111410商购获得的5.0g木浆和可从Sumitomo Seika Ltd.以产品代码SA70商购获得的0.4g超吸收聚合物构成。吸收芯具有0.103g/cc的密度。转移层由可从Buckeye(Memphis，Tenn.)以产品代码X853-2商购获得的75gsm无尘纸构成。转移层置于可从Clopay以产品代码113689商购获得的聚乙烯薄膜阻挡层上。转移层具有0.058g/cc的密度。通过在40mm(宽度)×100mm(长度)的区域上施加5.0gsm粘合剂将转移层附着在吸收芯上，粘合剂可从Bostik-Findley以产品代码H-2900商购获得。通过在阻挡层表面上施加3.6gsm粘合剂将转移层附着在阻挡层上，粘合剂可从Bostik-Findley以产品代码H-2900商购获得。
比较例1
比较例1由发明实例中的相同材料构成，不同的是转移层布置在覆盖层和吸收芯之间，并且吸收芯由实心层构成，即吸收芯不含任何无材料区。
比较例2
比较例2为Always Regular Maxi(批号82434786421709UPC3700030563)。
发明实例、比较例1和比较例2中每一个都按照上述测试方法进行测试，测试结果归纳在下表1中。
表1
如上表所示，根据本发明的吸收制品与类似的现有技术制品相比具有卓越的液体处理特性。

Claims (25)

1.一种吸收制品，包括：
纵向延伸中心线；
横向延伸中心线；
具有面向身体的表面的液体可透过的覆盖层；
液体不可透过的阻挡层；
邻近所述覆盖层布置的吸收芯；
布置在所述吸收芯和所述阻挡层之间的转移层，所述转移层具有比所述覆盖层更大比例的更小的孔；
其中，所述吸收芯包括上表面、下表面和从所述上表面延伸至所述下表面的无材料区；以及
其中，所述覆盖层包括与所述转移层以间隔关系布置的第一区域和与所述转移层以表面对表面接触关系布置的第二区域，
其中，所述转移层整个与所述阻挡层内侧相邻，并且所述转移层在其两侧与所述吸收芯以及所述阻挡层结合，并且所述转移层沿纵向比所述吸收芯短，以防止体液回渗到所述覆盖层，
其中，所述转移层直接接纳来自所述无材料区内的所述覆盖层的液体，接着沿所述吸收制品的纵向和横向芯吸液体，直到液体能向上传递并被吸入所述吸收芯中。
2.根据权利要求1所述的吸收制品，其特征在于，所述无材料区相对于所述纵向延伸中心线和所述横向延伸中心线居中对齐。
3.根据权利要求2所述的吸收制品，其特征在于，所述无材料区在400mm2和6000mm2之间的区域上延伸。
4.根据权利要求3所述的吸收制品，其特征在于，所述无材料区大致为椭圆形。
5.根据权利要求4所述的吸收制品，其特征在于，所述转移层、吸收芯和覆盖层相配合而在所述制品的所述面向身体的表面内限定纵向延伸的沟槽，所述沟槽具有在0.5mm和20mm之间范围内的深度。
6.根据权利要求1所述的吸收制品，其特征在于，所述吸收制品的纵向芯吸值大于60。
7.根据权利要求6所述的吸收制品，其特征在于，所述吸收制品的横向芯吸值大于35。
8.根据权利要求7所述的吸收制品，其特征在于，所述吸收制品的液体渗透时间小于10秒。
9.根据权利要求8所述的吸收制品，其特征在于，所述吸收制品的回渗值小于1g。
10.根据权利要求1所述的吸收制品，其特征在于，所述转移层不含超吸收材料。
11.根据权利要求10所述的吸收制品，其特征在于，所述吸收芯包含纤维素纤维和超吸收聚合物的混合物，所述吸收芯包含95重量％至40重量％的所述纤维素纤维和5重量％至60重量％的所述超吸收聚合物。
12.根据权利要求1所述的吸收制品，其特征在于，还包括设置在所述吸收芯和所述转移层之间的第二吸收芯，其中所述第二吸收芯包括从所述第二吸收芯上表面延伸至所述第二吸收芯下表面的无材料区，并且其中所述第二吸收芯的所述无材料区在尺寸和形状上与所述吸收芯的无材料区相对应。
13.根据权利要求12所述的吸收制品，其特征在于，所述转移层、吸收芯、第二吸收芯和覆盖层相配合而在所述制品的所述面向身体的表面内限定纵向延伸的沟槽，所述沟槽具有在1.0mm和40mm之间范围内的深度。
14.根据权利要求4所述的吸收制品，其特征在于，所述无材料区具有沿所述纵向延伸中心线测量的在40mm至250mm范围内的长度以及沿所述横向延伸中心线测量的10mm至60mm的宽度。
15.一种吸收制品，包括：
纵向延伸中心线；
横向延伸中心线；
具有面向身体的表面的液体可透过的覆盖层；
液体不可透过的阻挡层；
邻近所述覆盖层布置的吸收芯；
布置在所述吸收芯和所述阻挡层之间的转移层，所述转移层具有比所述覆盖层更大比例的更小的孔；
其中所述吸收芯包括上表面和下表面，所述吸收芯包括多个桁条和多个无材料区，每个所述桁条都与相邻桁条以间隔关系布置，并且每个所述桁条与相邻桁条由无材料区隔开，每个所述无材料区从所述上表面延伸至所述下表面；以及
其中所述覆盖层包括多个与所述转移层以间隔关系布置的第一区域和多个第二区域，每个所述第二区域位于两个相邻桁条之间，并且与所述转移层以表面对表面接触关系布置，
其中，所述转移层整个与所述阻挡层内侧相邻，并且所述转移层在其两侧与所述吸收芯以及所述阻挡层结合，并且所述转移层沿纵向比所述吸收芯短，以防止体液回渗到所述覆盖层，
其中，所述转移层直接接纳来自所述无材料区内的所述覆盖层的液体，接着沿所述吸收制品的纵向和横向芯吸液体，直到液体能向上传递并被吸入所述吸收芯中。
16.根据权利要求15所述的吸收制品，其特征在于，每个所述无材料区具有在1mm和10mm之间范围内的宽度和在40mm和250mm之间范围内的长度。
17.根据权利要求16所述的吸收制品，其特征在于，所述吸收制品包括在2个和7个之间的纵向延伸的无材料区，每个所述无材料区与相邻无材料区横向间隔5mm至30mm的距离。
18.根据权利要求17所述的吸收制品，其特征在于，每个所述无材料区都在50mm2和4000mm2之间范围内的表面积上延伸。
19.根据权利要求17所述的吸收制品，其特征在于，所述转移层、吸收芯和覆盖层相配合而在所述制品的所述面向身体的表面内限定多个纵向延伸的沟槽，每个所述沟槽都具有在0.5mm和20mm之间范围内的深度。
20.根据权利要求19所述的吸收制品，其特征在于，所述吸收制品的纵向芯吸值大于60。
21.根据权利要求20所述的吸收制品，其特征在于，所述吸收制品的横向芯吸值大于40。
22.根据权利要求21所述的吸收制品，其特征在于，所述吸收制品的液体渗透时间小于5秒。
23.根据权利要求22所述的吸收制品，其特征在于，所述吸收制品的回渗值小于1g。
24.根据权利要求15所述的吸收制品，其特征在于，所述转移层不含超吸收材料。
25.根据权利要求24所述的吸收制品，其特征在于，所述吸收芯包含纤维素纤维和超吸收聚合物的混合物，所述吸收芯包含95重量％至40重量％的所述纤维素纤维和5重量％至60重量％的所述超吸收聚合物。
CN201010276475.5A 2009-09-04 2010-09-02 包括具有无材料区的吸收芯层和设于吸收芯层下面的转移层的吸收制品 Expired - Fee Related CN102008375B (zh)

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