CN101677892A - 具有包括大体上连续分配的吸收性粒状聚合物材料的密封吸收芯的一次性吸收制品 - Google Patents

具有包括大体上连续分配的吸收性粒状聚合物材料的密封吸收芯的一次性吸收制品 Download PDF

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CN101677892A
CN101677892A CN200880020839A CN200880020839A CN101677892A CN 101677892 A CN101677892 A CN 101677892A CN 200880020839 A CN200880020839 A CN 200880020839A CN 200880020839 A CN200880020839 A CN 200880020839A CN 101677892 A CN101677892 A CN 101677892A
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particulate polymer
polymer material
absorbability particulate
core wrap
absorbent article
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CN101677892B (zh
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哈拉尔德·H·亨多夫
霍尔格·贝鲁达
霍斯特·布莱辛
彼得·齐佐克
阿克塞尔·克劳斯
马蒂亚斯·施密特
卢茨·斯特尔齐格
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Procter and Gamble Ltd
Procter and Gamble Co
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    • AHUMAN NECESSITIES
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    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
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    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F13/00Bandages or dressings; Absorbent pads
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    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent 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
    • A61F2013/530481Absorbent 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 having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051Absorbent 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 having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
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Abstract

本发明公开了一次性吸收制品,该一次性吸收制品包括底座和大体上不含纤维素的吸收芯。所述底座可包含顶片和底片。该吸收芯可位于顶片和底片之间并且可包括(i)存储层,所述存储层包括吸收性粒状聚合物材料并且具有面向穿着者侧和相对的面向衣服侧;(ii)第一芯部包裹片,所述第一芯部包裹片覆盖存储层的面向穿着者侧;和(iii)第二芯部包裹片,所述第二芯部包裹片覆盖存储层的面向衣服侧。第一芯部包裹片沿至少一个横向密封区接合到第二芯部包裹片上。

Description

具有包括大体上连续分配的吸收性粒状聚合物材料的密封吸收芯的一次性吸收制品
发明领域
本发明一般涉及吸收制品。更具体地讲,本发明涉及具有吸收性粒状聚合物材料的一次性吸收制品,例如尿布。
发明背景
吸收制品,例如一次性尿布、训练裤和成人失禁内衣,可吸收和容纳身体流出物。它们也旨在防止身体流出物脏污、润湿或换句话讲污染与穿着者接触的衣物或其它制品例如被褥。一次性吸收制品例如一次性尿布可以干燥状态或载尿状态被穿着数小时。因此,已做出许多努力来改善吸收制品在干燥时以及在完全地或部分地载有液体流出物时对穿着者的贴合性和舒适性,并同时保持或增强制品的吸收和容纳功能。
一些吸收制品如尿布包含吸收性聚合物材料(也称为超吸收聚合物),例如吸收性粒状聚合物材料。吸收性粒状聚合物材料可吸收液体并溶胀,并且当其以某种图案或排列的形式设置在吸收制品中以便具有最佳吸收性、贴合性和/或舒适性时可更有效。因此,期望吸收性粒状聚合物材料在吸收制品中保持在其预期位置,因此吸收性粒状聚合物材料可理想地固定在吸收制品中,使得当吸收制品干燥和润湿时,吸收性粒状聚合物材料均可保持固定。
除了具有吸收性以外,吸收制品例如尿布还可理想地为薄的且柔软的,以便使用时可较为舒适并且便于更方便且更整洁地进行包装和储存。通常被大量地使用的吸收制品也可理想地较为廉价。一些将吸收性粒状聚合物材料固定在吸收制品中的技术会增加吸收制品的堆积体积,从而会增大厚度、减小柔韧性和/或会增大吸收制品的成本。其它用于将吸收性粒状聚合物材料固定在吸收制品中的技术在保持固定作用方面在吸收制品处于润湿状态时不如在其处于干燥状态时那样有效。因此,一直需要一种薄的、柔软的和/或廉价的包含吸收性粒状聚合物材料的吸收制品,其中吸收性粒状聚合物材料在处于干燥状态和润湿状态的制品中具有增强的固定作用。
此外,一般还期望防止吸收性粒状聚合物材料从吸收制品例如尿布中逸出。例如,此类超吸收材料(它们可被称为水凝胶)的逸出可最终导致与穿着者的接触。此类皮肤上凝胶的发生被认为是不可取的,因为很多消费者认为皮肤接触是令人不悦的。因此,需要一种薄的、柔软的包含吸收性粒状聚合物材料的吸收制品,其可高效地防止粒状聚合物材料从吸收制品的吸收芯中逸出。
发明内容
本发明解决了上述的一个或多个技术问题,并且提供了一种一次性吸收制品,所述吸收制品可包括底座和大体上不含纤维素的吸收芯。底座可包含顶片和底片。吸收芯可位于顶片和底片之间,并且可具有当制品被穿着时朝穿着者定向的面向穿着者侧和相对的面向衣服侧。吸收芯可包括(i)存储层,所述存储层包括吸收性粒状聚合物材料并且具有面向穿着者侧和相对的面向衣服侧;(ii)第一芯部包裹片,所述第一芯部包裹片覆盖存储层的面向穿着者侧;和(iii)第二芯部包裹片,所述第二芯部包裹片覆盖存储层的面向衣服侧。第一芯部包裹片沿至少一个横向密封区接合到第二芯部包裹片上。
在一个实施方案中,存储层、第一芯部包裹片和第二芯部包裹片一起构成第一和第二吸收层。第一芯部包裹片为第一吸收层的第一基底,并且第二芯部包裹片为第二吸收层的第二基底,其中吸收粒状聚合物材料沉积在第一和第二基底上,并且热塑性粘合剂材料覆盖各自的第一和第二基底上的吸收粒状聚合物材料。第一和第二吸收层可组合在一起,使得所述第一吸收层的所述热塑性粘合剂材料的至少一部分接触所述第二吸收层的热塑性粘合剂材料的至少一部分,吸收粒状聚合物材料在第一和第二基底之间设置在吸收性粒状聚合物材料区域中,并且吸收性粒状聚合物材料大体上连续地分配在吸收性粒状聚合物材料区域上。
通过阅读以下的发明详述、附图和权利要求书,本发明的其它特征和优点可变得显而易见。
附图概述
图1为如本发明的一个实施方案所述的尿布的平面图。
图2是沿图1的截线2-2截取的图1所示尿布的截面图。
图3为如本发明的一个实施方案所述的吸收芯层的局部剖面图。
图4为如本发明的另一个实施方案所述的吸收芯层的局部剖面图。
图5为图3所示吸收芯层的平面图。
图6为如本发明的一个实施方案所述的第二吸收芯层的平面图。
图7a为吸收芯的局部截面图,其包括图5和6所示第一和第二吸收芯层的组合。
图7b为吸收芯的局部截面图,其包括图5和6所示第一和第二吸收芯层的组合。
图8为图7a和7b所示吸收芯的平面图。
图9为流变仪的示意图。
图10为用于制造如本发明的一个实施方案所述的吸收芯的方法的示意图。
图11为用于制造如本发明的一个实施方案所述的吸收芯的设备的局部截面图。
图12为图11所示印刷辊的透视图。
图13为图12所示印刷辊的局部截面图,其显示了吸收性粒状聚合物材料贮存器。
图14为图12所示支撑辊的透视图。
图15为如本发明的一个实施方案所述的密封吸收芯的平面图。
图16为如本发明的另一个实施方案所述的密封吸收芯的平面图。
图17为如本发明的又一个实施方案所述的密封吸收芯的平面图。
发明详述
“吸收制品”是指吸收和容纳身体流出物的装置,更具体地讲是指紧贴或邻近穿着者的身体放置以吸收和容纳由身体排泄的各种流出物的装置。吸收制品可包括尿布、训练裤、成人失禁内衣、妇女卫生制品、胸垫、护理垫、围兜、伤口敷料产品等。如本文所用,术语“体液”或“身体流出物”包括但不限于尿液、血液、阴道排出物、乳汁、汗液和粪便。
“吸收芯”是指如下结构,所述结构通常设置在吸收制品的顶片和底片之间来用于吸收和容纳由吸收制品所接收的液体,并且可包括一个或多个基底、设置在一个或多个基底上的吸收性聚合物材料、以及吸收性粒状聚合物材料和一个或多个基底的至少一部分上的热塑性组合物,所述组合物用于将吸收性粒状聚合物材料固定在一个或多个基底上。在多层的吸收芯中,吸收芯也可包括覆盖层。该一个或多个基底和覆盖层可包括非织造材料。此外,吸收芯大体上不含纤维素。吸收芯不包括吸收制品的采集系统、顶片或底片。在一个实施方案中,吸收芯将基本上由所述一个或多个基底、吸收性聚合材料、热塑性组合物、以及任选的覆盖层组成。
“吸收性聚合物材料”、“吸收胶凝材料”、“AGM”、“超吸收物”和“超吸收材料”在本文中可互换使用并且是指交联聚合材料。当使用“离心保留容量”测试(Edana 441.2-01)来测定时,所述聚合材料能够吸收至少5倍于它们自身重量的含水的0.9%盐水溶液。
如本文所用,“吸收性粒状聚合物材料”是指呈颗粒形式以致在干燥状态时可流动的吸收性聚合物材料。
如本文所用,“吸收性粒状聚合物材料区域”是指芯的如下区域,其中第一基底64和第二基底72被大量的超吸收颗粒隔开。在图8中,吸收性粒状聚合物材料区域的边界由重叠的圆的周边限定。在此周边之外的第一基底64和第二基底72之间可存在一些外界的超吸收颗粒。
本文所用“透气毡”是指粉碎的木浆,其为纤维素纤维的一种形式。
“包括”及“包含”是开放式术语,每个均指定其后所述例如一个组分的存在,但不排除本领域已知的或本文所公开的其它特征例如元件、步骤或组分的存在。
“基本上由...组成”在本文中用来将主题(例如权利要求中的主题)的范围限制于指定的材料或步骤、以及不显著地影响主题的基本和新型特性的材料或步骤。
“一次性的”以其普通的含义使用,其是指在不同时长内的有限数目的使用事件(例如小于约20次事件,小于约10次事件,小于约5次事件,或小于约2次事件)之后被处理或丢弃的制品。
“尿布”是指一般被婴儿和失禁患者围绕下体穿着以便环绕穿着者的腰部和腿部并且特别适于接收和容纳尿液和粪便的吸收制品。如本文所用,术语“尿布”也包括下文所定义的“裤”。
“纤维”和“长丝”可互换使用。
“非织造材料”为由定向或任意取向的纤维通过摩擦和/或粘合和/或粘着而粘结成的、或通过湿磨法而毡化成的人造片、纤维网或毛层,不包括纸张和通过织造、编织、簇成、缝编而合并束缚的纱或长丝产品,不考虑是否另外缝过。这些纤维可具有天然的或人造的来源,并且可为短纤维或连续长丝或为就地形成的纤维。市售纤维的直径范围小于约0.001mm至大于约0.2mm,并且它们具有几种不同的形式:短纤维(又称为化学短纤维或短切纤维)、连续单纤维(长丝或单丝)、无捻连续长丝束(丝束)和加捻连续长丝束(纱)。非织造织物可通过许多方法例如熔喷法、纺粘法、溶液纺丝、静电纺纱、以及粗梳法来形成。非织造织物的基重通常用克/平方米(gsm)表示。
如本文所用,“裤”或“训练短裤”是指为婴儿或成人穿着者设计的具有腰部开口和腿部开口的一次性衣服。通过将穿着者的腿伸入腿部开口并将裤拉到围绕穿着者下体的适当位置可将裤穿到使用者身上。裤子可使用任何合适的技术来预成形,所述技术包括但不限于利用可重复扣紧的和/或不可重复扣紧的粘结(例如,缝合、焊接、粘合剂、胶粘剂粘结、扣件等)将制品的各部分接合在一起。裤可在沿该制品圆周的任何地方预成形(例如,侧扣紧、前腰扣紧)。尽管本文使用的是术语“短裤”或“裤”,但裤通常也称为“闭合尿布”、“预紧固尿布”、“套穿尿布”、“训练裤”和“尿布裤”。合适的裤公开于以下专利中:1993年9月21日授予Hasse等人的美国专利5,246,433;1996年10月29日授予Buell等人的美国专利5,569,234;2000年9月19日授予Ashton的美国专利6,120,487;2000年9月19日授予Johnson等人的美国专利6,120,489;1990年7月10日授予Van Gompel等人的美国专利4,940,464;1992年3月3日授予Nomura等人的美国专利5,092,861;提交于2002年6月13日的题目为“Highly Flexible And Low Deformation Fastening Device”的美国专利公布2003/0233082A1;1999年4月27日授予Kline等人的美国专利5,897,545;1999年9月28日授予Kline等人的美国专利5,957,908。
“大体上不含纤维素”在本文中用来描述制品例如吸收芯,所述吸收芯包含按重量计小于10%的纤维素纤维,小于5%的纤维素纤维,小于1%的纤维素纤维,不含纤维素纤维,或不超过非显著量的纤维素纤维。非显著量的纤维素材料将不会显著地影响吸收芯的薄度、柔韧性或吸收性。
如本文所用,“大体上连续地分配”是指在吸收性粒状聚合物材料区域内第一基底64和第二基底72被大量的超吸收颗粒隔开。应当认识到,在第一基底64和第二基底72之间的吸收性粒状聚合物材料区域内可存在少数偶然的接触区域。第一基底64和第二基底72之间的偶然的接触区域可为有意的或无意的(例如人为的制造偏差),但不形成几何形状,例如枕块、口袋、管、绗缝图案等等。
如本文所用,“热塑性粘合剂材料”应被理解为包括形成纤维的聚合物混合物,并且所述纤维被施加到超吸收材料上以期在干燥状态和润湿状态时均可固定超吸收材料。本发明的热塑性粘合剂材料在超吸收材料上形成纤维性网络。
“厚度”(Thickness,caliper)在本文中可互换使用。
图1为如本发明的某个实施方案所述的尿布10的平面图。尿布10被显示处于其平展未收缩状态(即,没有弹性诱导收缩),并且尿布10的一些部分被切除以更清楚地显示尿布10的底层结构。在图1中,尿布10的接触穿着者的部分面对观察者。尿布10一般可包括底座12和设置在底座中的吸收芯14。
图1中的尿布10的底座12可包括尿布10的主体。底座12可包括外覆盖件16,所述外覆盖件包括可为液体可透过的顶片18和/或可为液体不可透过的底片20。吸收芯14可封装在顶片18和底片20之间。底座12也可包括侧片22、弹性化腿箍24和弹性腰部组件26。
腿箍24和弹性腰部组件26通常可各包括弹性构件28。尿布10的一个端部可被构造为尿布10的第一腰区30。尿布10的相对的端部可被构造为尿布10的第二腰区32。尿布10的中间部分可被构造为裆区34,所述裆区在第一和第二腰区30和32之间纵向延伸。腰区30和32可包括弹性元件以使得它们围绕穿着者的腰部聚拢以提供改进的贴合性和密封性(弹性腰部组件26)。裆区34为当尿布10被穿着时尿布10的一般定位在穿着者的两腿之间的那个部分。
尿布10在图1中被描绘成具有纵向轴线36和横向轴线38。尿布10的周边40由尿布10的外边缘限定,其中纵向边缘42大致平行于尿布10的纵向轴线36延伸,并且端边44大致平行于尿布10的横向轴线38延伸在纵向边缘42之间。底座12也可包括扣紧系统,所述系统可包括至少一个扣紧构件46和至少一个存储着陆区48。
尿布20也可包括在本领域已知的其它此类部件,包括前后耳片、腰罩部件、弹性部件等,以提供更好的贴合性、密封性和审美特性。此类附加部件已为本领域所熟知并被例如描述于美国专利3,860,003和美国专利5,151,092中。
为了将尿布10保持在围绕穿着者的适当位置,第一腰区30的至少一部分可由扣紧构件46连接到第二腰区32的至少一部分上以形成腿部开口和制品腰部。当扣紧时,扣紧系统承受制品腰部周围的拉伸载荷。扣紧系统可允许制品使用者抓持扣紧系统的一个元件,例如扣紧构件46,并且在至少两个位置上将第一腰区30连接到第二腰区32上。这可通过操纵扣紧装置的元件之间的粘结强度来实现。
根据某些实施方案,尿布10可具有可重新闭合的扣紧系统,或者作为另外一种选择可以裤型尿布的形式提供。当吸收制品为尿布时,所述制品可包括接合到底座上的可重新闭合的扣紧系统,所述系统用于将尿布固定到穿着者身上。当吸收制品为裤型尿布时,制品可包括至少两个接合到底座上并且彼此接合的侧片以形成裤。扣紧系统及其任何组件可包括适用于这种用途的任何材料,包括但不限于塑料、薄膜、泡沫、非织造材料、织造材料、纸、层压体、纤维增强的塑料等、或它们的组合。在某些实施方案中,构成扣紧装置的材料可为柔韧的。该柔韧性可允许扣紧系统适形于身体的形状,因此可减小扣紧系统刺激或伤害穿着者皮肤的可能性。
对于一体的吸收制品,底座12和吸收芯14可形成在添加其它部件后形成复合尿布结构的尿布10的主结构。尽管顶片18、底片20和吸收芯14可以多种熟知的构型装配,但优选的尿布构型一般描述于以下专利中:1996年9月10日授予Roe等人的题目为“Absorbent Article With Multiple ZoneStructural Elastic-Like Film Web Extensible Waist Feature”的美国专利5,554,145;1996年10月29日授予Buell等人的题目为“Disposable Pull-OnPant”的美国专利5,569,234;和1999年12月21日授予Robles等人的题目为“Absorbent Article With Multi-Directional Extensible Side Panels”的美国专利6,004,306。
图1中的顶片18可被完全或部分地弹性化或可缩短以在顶片18和吸收芯14之间提供空隙空间。包括弹性化的或缩短的顶片的示例性结构更详细地描述于以下专利中:1991年8月6日授予Allen等人的题目为“Disposable Absorbent Article Having Elastically Extensible Topsheet”的美国专利5,037,416;和1993年12月14日授予Freeland等人的题目为“TrisectionTopsheets for Disposable Absorbent Articles and Disposable Absorbent ArticlesHaving Such Trisection Topsheets”的美国专利5,269,775。
底片26可与顶片18接合。底片20可防止被吸收芯14所吸收并容纳在尿布10内的流出物脏污可能接触尿布10的其它外部制品,例如床单和内衣。在某些实施方案中,底片26可为大体上液体(例如,尿液)不可透过的,并且包括非织造材料和薄塑料薄膜的层压体,所述薄膜例如具有约0.012mm(0.5mil)至约0.051mm(2.0mils)厚度的热塑性薄膜。合适的底片薄膜包括由Tredegar Industries Inc.,Terre Haute,Ind.制造并以商品名X15306、X10962和X10964出售的那些。其它合适的底片材料可包括允许蒸汽从尿布10逸出同时仍然防止液体流出物透过底片10的透气材料。示例性透气材料可包括例如织造纤维网、非织造纤维网之类的材料、例如膜包衣的非织造纤维网的复合材料以及例如日本的Mitsui Toatsu Co.制造的命名为ESPOIR NO和EXXON Chemical Co.(Bay City,TX)制造的命名为EXXAIRE的微孔薄膜。包括共混聚合物的适用透气复合材料以名称HYTREL共混物P18-3097得自Cincinnati,Ohio的Clopay Corporation。此类透气复合材料更详细地描述于1995年6月22日以E.I.DuPont的名义公布的PCT专利申请WO 95/16746中。中。包括非织造纤网和开孔成形薄膜在内的其它透气底片描述于1996年11月5日授予Dobrin等人的美国专利5,571,096中。
在某些实施方案中,本发明的底片可具有大于约2000g/24h/m2,大于约3000g/24h/m2,大于约5000g/24h/m2,大于约6000g/24h/m2,大于约7000g/24h/m2,大于约8000g/24h/m2,大于约9000g/24h/m2,大于约10000g/24h/m2,大于约11000g/24h/m2,大于约12000g/24h/m2,大于约15000g/24h/m2的水蒸汽传输速率(WVTR),所述速率根据WSP 70.5(08)在37.8℃和60%的相对湿度下测定。
图2显示沿图1的截线2-2截取的图1的横截面。从面向穿着者侧开始,尿布10可包括顶片18、吸收芯14的组件和底片20。根据某个实施方案,尿布10也可包括采集系统50,所述采集系统设置在液体可透过的顶片18和吸收芯14的面向穿着者侧之间。采集系统50可直接接触吸收芯。采集系统50可包括单一层或多个层,例如面向穿着者皮肤的上部采集层52和面向穿着者衣服的下部采集层54。根据某个实施方案,采集系统50可用来接收液体涌流,例如尿液涌流。换句话讲,采集系统50可用作液体的暂时贮存器直到吸收芯14吸收液体为止。
在一个实施方案中,采集系统50可包括化学交联的纤维素纤维。此类交联的纤维素纤维可具有所期望的吸收特性。示例性化学交联的纤维素纤维公开于美国专利5,137,537中。在某些实施方案中,化学交联的纤维素纤维与基于葡萄糖单体的介于约0.5摩尔%和约10.0摩尔%之间的C2至C9聚羧交联剂交联,或与介于约1.5摩尔%和约6.0摩尔%之间的C2至C9的聚羧交联剂交联。柠檬酸为一种示例性交联剂。在其它实施方案中,可使用聚丙烯酸。此外,根据某些实施方案,交联的纤维素纤维具有约25至约60,或约28至约50,或约30至约45的保水值。用于确定保水值的方法公开于美国专利5,137,537中。根据某些实施方案,交联的纤维素纤维可为起褶皱的、加捻的、或卷曲的、或它们的组合(包括起褶皱的、加捻的和卷曲的)。
在一个实施方案中,上部采集层和下部采集层52和54中的一个或两者均可包括非织造材料,所述材料可为亲水的。此外,根据某个实施方案,上部采集层和下部采集层52和54中的一个或两者均可包括化学交联的纤维素纤维,所述纤维可或可不形成非织造材料的一部分。根据一个示例性实施方案,上部采集层52可包括非织造材料(不含交联的纤维素纤维),并且下部采集层54可包括化学交联的纤维素纤维。此外,根据一个实施方案,下部采集层54可包括与其它纤维例如天然或合成聚合物纤维相混合的化学交联的纤维素纤维。根据示例性实施方案,此类其它天然或合成聚合物纤维可包括高表面积纤维、热塑性粘合纤维、聚乙烯纤维、聚丙烯纤维、PET纤维、人造纤维、lyocell纤维、以及它们的混合物。根据一个特定实施方案,下部采集层54具有总干重。交联的纤维素纤维基于某个干重存在于上部采集层中,所述干重为按下部采集层54的重量计约30%至约95%的量;并且其它天然或合成聚合物纤维也基于某个干重存在于下部采集层54中,所述干重为按下部采集层54的重量计约70%至约5%的量。根据另一个实施方案,交联的纤维素纤维基于某个干重存在于第一采集层中,所述干重为按下部采集层54的重量计约80%至约90%的量;并且其它天然或合成聚合物纤维也基于某个干重存在于下部采集层54中,所述干重为按下部采集层54的重量计约20%至约10%的量。
根据某个实施方案,期望下部采集层54具有高的流体摄取能力。流体摄取值被测量为每克吸收材料所吸收的流体的克数,并且用“最大摄取”值来表示。因此高流体摄取值对应于材料的高容量并且是有益的,因为其可确保完全采集旨在被采集材料吸收的流体。根据示例性实施方案,下部采集层54具有约10g/g的最大摄取值。
上部采集层54的一个相关属性为其“中值解吸压”,即MDP。MDP为在0.3psi的外加机械压力下以0cm的毛细管抽吸高度将上部采集层54脱水至其容量的约50%所需的毛细管压力的量度。一般来讲,相对较低的MDP可为适用的。较低的MDP可允许下部采集层54更可效地排干上部采集材料。不受理论的束缚,给定的分配材料可具有可限定的毛细管抽吸。下部采集层54通过毛细管力竖直地移动液体的能力将直接受到重力和与上部采集层的解吸相关联的相反的毛细管力的影响。最小化这些毛细管力可有利地影响下部采集层54的性能。然而,在一个实施方案中,下部采集层54也可具有足够的毛细管吸收抽吸,以便排干以上各层(具体地讲即上部采集层52和顶片18),并且暂时保持液体直到液体可被吸收芯组件分配掉。因此,在一个实施方案中,下部采集层54可具有大于5cm的最小MDP。此外,根据示例性实施方案,下部采集层54具有小于约20.5cm H2O,或小于约19cm H2O,或小于约18cm H2O的MDP值,以提供快速采集。
用于确定MDP和最大摄取值的方法公开于美国专利申请11/600,691(Flohr等人)中。例如,根据第一实施方案,下部采集层54可包括按重量计约70%的化学交联的纤维素纤维、按重量计约10%的聚酯(PET)和按重量计约20%的未经处理的纸浆纤维。根据第二实施方案,下部采集层54可包括按重量计约70%的化学交联的纤维素纤维、按重量计约20%的lyocell纤维和按重量计约10%的PET纤维。根据第三实施方案,下部采集层54可包括按重量计约68%的化学交联的纤维素纤维、按重量计约16%的未经处理的纸浆纤维和按重量计约16%的PET纤维。在一个实施方案中,下部采集层54可包括按重量计约90%至100%的化学交联的纤维素纤维。
用于上部采集层和下部采集层52和54的合适的非织造材料包括但不限于SMS材料,所述SMS材料包括纺粘层、熔喷层和另一个纺粘层。在某些实施方案中,永久性亲水的非织造材料(具体地讲为具有永久性亲水涂层的非织造材料)是所期望的。其它合适的实施方案包括SMMS结构体。在某些实施方案中,非织造材料为多孔的。
在某些实施方案中,合适的非织造材料可包括但不限于合成纤维,例如PE、PET和PP。由于用于非织造材料生产的聚合物本身可为疏水的,因此可将它们涂覆上亲水涂层。一种生产具有永久性亲水涂层的非织造材料的方法是,通过将亲水单体和自由基聚合引发剂施用到非织造材料上,并且进行通过紫外光所激发的聚合物反应,从而导致单体化学地结合到非织造材料的表面上,如共同未决的美国专利公布2005/0159720中所述。另一种生产具有永久性亲水涂层的非织造材料的方法是,将非织造材料涂覆上亲水的纳米颗粒,如授予Rohrbaugh等人的共同未决的专利申请美国专利7,112,621和PCT专利申请公布WO 02/064877中所述。
通常,纳米颗粒的最大尺寸小于750nm。尺寸在2nm至750nm范围内的纳米颗粒可经济地进行生产。纳米颗粒的优点在于,它们中有很多均可容易地分散在水溶液中,使得涂层可施加到非织造材料上;它们通常形成透明涂层,并且从水溶液施加的涂层通常足以耐用于暴露在水中的场合。纳米颗粒可为有机的或无机的、合成的或天然的。无机纳米颗粒一般以氧化物、硅酸盐和/或碳酸盐的形式存在。合适的纳米颗粒的典型实例为层状粘土矿物(例如,得自Southern Clay Products,Inc.(美国)的LAPONITETM)和水软铝石矾土(例如,得自North American Sasol.Inc.的Disperal P2TM)。根据某个实施方案,合适的纳米颗粒涂覆的非织造材料为授予EkaterinaAnatolyevna Ponomarenko和Mattias NMN Schmidt的题目为“Disposableabsorbent article comprising a durable hydrophilic core wrap”的共同未决的专利申请序列号10/758,066中所公开的那种。
更多适用的非织造材料描述于以下专利中:授予Cramer等人的美国专利6,645,569、授予Cramer等人的美国专利6,863,933、授予Rohrbaugh等人的美国专利7,112,621、以及授予Cramer等人的共同未决的专利申请10/338,603和授予Cramer等人的10/338,610。
在一些情况下,在涂敷纳米颗粒涂层之前,可将非织造材料表面用高能处理方法(电晕、等离子)进行预处理。高能预处理通常可暂时增大低表面能表面(例如PP)的表面能,因此使非织造材料能够被水中的纳米颗粒分散体更好地润湿。
值得注意的是,永久性亲水的非织造材料也适用于吸收制品的其它部分。例如,已发现包括如上所述的永久性亲水的非织造材料的顶片和吸收芯层使用效果良好。
根据某个实施方案,上部采集层52可包括如下的材料,当施加并移除外部压力时所述材料可良好地恢复。此外,根据某个实施方案,上部采集层52可包括选自例如上述类型的聚合物纤维的不同纤维的共混物。在一些实施方案中,这些纤维的至少一部分可表现出具有螺旋状形状的螺旋形褶皱。在一些实施方案中,上部采集层52可包括具有不同的褶皱程度或类型或同时具有不同的褶皱程度和类型的纤维。例如,一个实施方案可包括具有约8个褶皱/英寸至约12个褶皱/英寸(cpi)或约9cpi至约10cpi的纤维和具有约4cpi至约8cpi或约5cpi至约7cpi的其它纤维的混合物。不同类型的褶皱包括但不限于两维褶皱或“平坦褶皱”和3D或螺旋形褶皱。根据某个实施方案,这些纤维可包括双组分纤维,它们为各自包括不同的材料(通常为第一和第二聚合物材料)的单根纤维。据信使用并列型双组分纤维有益于向纤维赋予螺旋形褶皱。
在一个实施方案中,上部采集层52可由胶乳粘合剂例如苯乙烯-丁二烯胶乳粘合剂(SB胶乳)来稳定。用于获得此类晶格的方法是已知的,例如,可见于EP 149880(Kwok)和US 2003/0105190(Diehl等人)。在某些实施方案中,粘合剂可以按重量计超过约12%,约14%或约16%的量存在于上部采集层52中。对于某些实施方案,SB胶乳可以商品名GENFLOTM3160(OMNOVA Solutions Inc.;Akron,Ohio)获得。
图1至8中的吸收芯14一般设置在顶片18和底片20之间,并且包括两个层,即第一吸收层60和第二吸收层62。如图3最佳所示,吸收芯14的第一吸收层60包括基底64、基底64上的吸收性粒状聚合物材料66、以及吸收性粒状聚合物材料66和第一基底64的至少部分上的热塑性组合物68,所述组合物用作粘合剂来用于覆盖并固定第一基底64上的吸收性粒状聚合物材料66。根据图4所示的另一个实施方案示,吸收芯14的第一吸收层60也可包括热塑性组合物68上的覆盖层70。
同样,如图2最佳所示,吸收芯14的第二吸收层62也可包括基底72、第二基底72上的吸收性粒状聚合物材料74、以及吸收性粒状聚合物材料74和第二基底72的至少一部分上的热塑性组合物66,所述组合物用于固定第二基底72上的吸收性粒状聚合物材料74。虽然未被示出,但第二吸收层62也可包括覆盖层例如图4所示的覆盖层70。
第一吸收层60的基底64可称为除尘层,并且具有面对尿布10的底片20的第一表面78和面对吸收性粒状聚合材料66的第二表面80。同样,第二吸收层62的基底72可称为芯覆盖件,并且具有面对尿布10的顶片18的第一表面82和面对吸收性粒状聚合材料74的第二表面84。第一和第二基底64和72可用粘合剂围绕周边彼此粘附,以围绕吸收性粒状聚合材料66和74形成包层,从而将吸收性粒状聚合材料66和74保持在吸收芯14内。
根据某个实施方案,第一和第二吸收层60和62的基底64和72可为非织造材料,例如上述的那些非织造材料。在某些实施方案中,这些非织造材料为多孔的,并且在一个实施方案中具有约32微米的孔径。
如图1至8所示,吸收性粒状聚合物材料66和74以颗粒簇90的形式沉积在第一和第二吸收层60和62的各自的基底64和72上以形成网格图案92,所述图案包括着陆区域94和着陆区域94之间的接合区域96。所本文所定义,着陆区域94为其中热塑性粘合剂材料不直接接触非织造基底或辅助粘合剂的区域;接合区域96为其中热塑性粘合剂材料确实直接接触非织造基底或辅助粘合剂的区域。网格图案92中的接合区域96包含极少的或完全不含吸收性粒状聚合物材料66和74。着陆区域94和接合区域96可具有多种形状,所述形状包括但不限于圆形、椭圆形、正方形、矩形、三角形等等。
图8所示的网格图案为正方形网格,其具有规则的着陆区域的间距和尺寸。也可使用其它网格图案,包括六边形、菱形、斜方形、平行四边形、三角形、矩形、以及它们的组合。网格线之间的间距可为规则的或不规则的。
网格图案92中的着陆区域94的尺寸可有变化。根据某些实施方案,网格图案92中的着陆区域94的宽度119在约8mm至约12mm的范围内。在一个实施方案中,着陆区域94的宽度为约10mm。另一方面,在某些实施方案中,接合区域96具有小于约5mm,小于约3mm,小于约2mm,小于约1.5mm,小于约1mm,或小于约0.5mm的宽度或更大跨度。
如图8所示,吸收芯14具有从后端102延伸至前端104的纵向轴线100和垂直于纵向轴线100从第一边缘108延伸至第二边缘110的横向轴线106。吸收性粒状聚合物材料簇90的网格图案92排列在各自的吸收层60和62的基底64和72上,使得由排列的着陆区域94和接合区域96所形成的网格图案92形成图案角度112。图案角度112可为0度,大于0度,或15至30度,或约5至约85度,或约10至约60度,或约15至约30度。
如图7a、7b和8最佳所示,第一层和第二层60和62可组合形成吸收芯14。吸收芯14具有由图案长度116和图案宽度118限定的吸收性粒状聚合物材料区域114。取决于吸收芯14的所需应用和可在其中引入吸收芯的特定吸收制品,吸收性粒状聚合物材料区域114的范围和形状可有变化。然而,在一个实施方案中,吸收性粒状聚合物材料区域114大体上在吸收芯14上延伸,如图8所示。
第一和第二吸收层60和62可组合在一起形成吸收芯14,使得各自的第一和第二吸收层62和64的网格图案92沿吸收芯14的长度和/或宽度彼此偏移。各自的网格图案92可偏移而使得吸收性粒状聚合物材料66和74大体上连续地分配在吸收性粒状聚合物区域114上。在一个实施方案中,吸收性粒状聚合物材料66和74大体上连续地分配在吸收性粒状聚合物材料区域114上,尽管个别的包括吸收性粒状聚合物材料66和74的网格图案92可成簇90地非连续地分配在第一和第二基底64和72上。在一个实施方案中,网格图案可偏移而使得第一吸收层60的着陆区域94面对第二吸收层62的接合区域96,并且第二吸收层62的着陆区域面对第一吸收层60的接合区域96。当着陆区域94和接合区域96具有适当的尺寸和排列时,所得吸收性粒状聚合物材料66和74的组合为吸收芯14的吸收性粒状聚合物材料区域114上的大体上连续的吸收性特定聚合物材料层(即,第一和第二基底64和72不形成多个口袋,它们各自在其间包含吸收性粒状聚合物材料66的簇90)。在一个实施方案中,第一和第二吸收层60和62的各自的网格图案92可大体上相同。
在如图8所示的某个实施方案中,吸收性粒状聚合物材料66和74的量可沿网格图案92的长度116有变化。在一个实施方案中,网格图案可被划分成吸收区120、122、124和126,其中吸收性粒状聚合物材料66和74的量因区而异。如本文所用,“吸收区”是指吸收性粒状聚合物材料区域中的具有垂直于图8所示的纵向轴线的边界的区。在一个实施方案中,吸收性粒状聚合物材料66和74的量可从多个吸收区120、122、124和126中的一个逐渐过渡到另一个。该吸收性粒状聚合材料66和74的量的逐渐过渡可减少在吸收芯14中形成断裂的可能性。
存在于吸收芯14中的吸收性粒状聚合材料66和74的量可有变化,但在某些实施方案中,吸收性粒状聚合材料以按吸收芯的重量计大于约80%,或按吸收芯的重量计大于约85%,或按吸收芯的重量计大于约90%,或按芯的重量计大于约95%的量存在于吸收芯中。在一个特定实施方案中,吸收芯14基本上由第一和第二基底64和72、吸收性粒状聚合材料66和74和热塑性粘合剂组合物68和76组成。在一个实施方案中,吸收芯14可大体上不含纤维素。
根据某些实施方案,至少一个自由选择的尺寸为1cmx1cm的第一正方形中的吸收性粒状聚合物材料66和74的重量可至少约10%,或20%,或30%,40%或50%地高于至少一个自由选择的尺寸为1cmx1cm的第二正方形中的吸收性粒状聚合物材料66和74的重量。在一个实施方案中,将第一和第二正方形置中在纵向轴线周围。
根据一个示例性实施方案,吸收性粒状聚合物材料区域在吸收制品的裆区中可具有相对窄的宽度以便增大穿着舒适性。因此,根据一个实施方案,当沿着位于与吸收制品的前边缘和后边缘等距离处的横向线测量时,吸收性粒状聚合物材料区域可具有小于约100mm,90mm,80mm,70mm,60mm或甚至小于约50mm的宽度。
已发现,对于大多数吸收制品例如尿布,液体排泄主要发生在尿布的前半部中。因此吸收芯14的前半部应包括芯的大部分吸收容量。因此,根据某些实施方案,所述吸收芯14的前半部可包括超过约60%的超吸收材料,或超过约65%,70%,75%,80%,85%,或90%的超吸收材料。
在某些实施方案中,吸收芯14还可包括任何吸收材料,所述材料一般为可压缩的、适形的、对穿着者的皮肤无刺激的,并且能够吸收和保留液体例如尿液和其它某些身体流出物。在此类实施方案中,吸收芯14可包括一次性尿布和其它吸收制品中常用的各种各样的液体吸收材料,例如粉碎的木浆(一般称为透气毡)、绉纱纤维素填料、熔喷聚合物(包括共成形)、化学硬化、更性或交联的纤维素纤维、薄纸(包括薄纸包装材料和薄纸层压材料)、吸收泡沫、吸收海绵、或任何其它已知的吸收材料或材料的组合。吸收芯14还可包括少量(通常小于约10%)的材料,例如粘合剂、蜡、油等。
可用作吸收组件的示例性吸收结构描述于下列专利中:美国专利4,610,678(Weisman等人);美国专利4,834,735(Alemany等人);美国专利4,888,231(Angstadt);美国专利5,260,345(DesMarais等人);美国专利5,387,207(Dyer等人);美国专利5,397,316(LaVon等人);以及美国专利5,625,222(DesMarais等人)。
热塑性粘合剂材料68和76可用来覆盖和至少部分地固定吸收性粒状聚合物材料66和74。在本发明的一个实施方案中,热塑性粘合剂材料68和76可大体上均匀地设置在吸收性粒状聚合物材料66和74内,位于各聚合物之间。然而,在一个实施方案中,可将热塑性粘合剂材料68和76作为纤维层提供,所述层至少部分地接触吸收性粒状聚合物材料66和74并且部分地接触第一和第二吸收层60和62的基底层64和72。图3、4和7显示了这种结构,并且在该结构中将吸收性粒状聚合物材料66和74作为不连续层提供,并且将纤维热塑性粘合剂材料68和76层铺设到吸收性粒状聚合物材料66和74层上,使得热塑性粘合剂材料68和76直接接触吸收性粒状聚合物材料66和74,但也直接接触基底64和72的第二表面80和84,在那里基底不被吸收性粒状聚合物材料66和74覆盖。这将赋予热塑性粘合剂材料68和76的纤维层大体上三维的结构,所述结构本身与长度方向和宽度方向上的尺度相比为具有相对小厚度的大体上二维的结构。换句话讲,热塑性粘合剂材料68和76在吸收性粒状聚合物材料68和76以及基底64和72的第二表面之间起伏。
因此,热塑性粘合剂材料68和76可提供腔体以覆盖吸收性粒状聚合物材料66和74,从而固定此材料。在另一个方面,热塑性粘合剂材料68和76粘结到基底64和72上,并且因此将吸收性粒状聚合物材料66和74固定到基底64和72上。因此,根据某些实施方案,热塑性粘合剂材料68和76可固定吸收性粒状聚合物材料66和74(当润湿时),使得吸收芯14可获得根据本文所述的“润湿固定测试”测定的不超过约70%,60%,50%,40%,30%,20%,10%的吸收性粒状聚合物材料损失。一些热塑性粘合剂材料也将透入到吸收性粒状聚合物材料66和74以及基底64和72中,因此提供进一步的固定作用和附着作用。当然,尽管本文所公开的热塑性粘合剂材料可提供大大改善的润湿固定作用(即,当制品润湿时或至少部分地载有液体时对吸收材料的固定作用),然而当吸收芯14干燥时这些热塑性粘合剂材料也可提供极好的对吸收材料的固定作用。热塑性粘合剂材料68和76也可称为热熔性粘合剂。
不受理论的束缚,已发现最适合用来固定吸收性粒状聚合物材料66和74的那些热塑性粘合剂材料兼有良好的内聚力和良好的粘附性能。良好的粘附性可促进热塑性粘合剂材料68和76以及吸收性粒状聚合物材料66和74与基底64和72之间的良好接触。良好的内聚力可减少粘合剂中断的可能性,尤其是响应于外力,即响应于应变而中断的可能性。当吸收芯14吸收液体时,吸收性粒状聚合物材料66和74会溶胀,因而会使热塑性粘合剂材料68和76受到外力的作用。在某些实施方案中,热塑性粘合剂材料68和76可允许此类溶胀而不会中断和赋予过多的压缩力,所述压缩力将抑制吸收性粒状聚合物材料66和74的溶胀。
根据某些实施方案,热塑性粘合剂材料68和76可包括(在其整体中)单一热塑性聚合物或热塑性聚合物的共混物,当通过ASTM方法D-36-95“Ring and Ball”测定时,所述聚合物具有在50℃至300℃范围内的软化点;或者作为另外一种选择,热塑性粘合剂材料可为热熔性粘合剂,其包括至少一种与其它热塑性稀释剂例如增粘树脂、增塑剂和添加剂例如抗氧化剂相组合的热塑性聚合物。在某些实施方案中,热塑性聚合物通常具有超过10,000的分子量(Mw)和通常低于室温的玻璃化转变温度(Tg)或-6℃>Tg<16℃。在某些实施方案中,热熔融聚合物的典型浓度按重量计在约20%至约40%的范围内。在某些实施方案中,热塑性聚合物可为对水不敏感的。示例性聚合物为包括A-B-A三嵌段结构、A-B两嵌段结构和(A-B)n径向嵌段共聚物结构的(苯乙烯)嵌段共聚物,其中A嵌段为通常包含聚苯乙烯的非弹性体聚合物嵌段,B嵌段为不饱和共轭双烯或(部分)氢化的此类变体。B嵌段通常为异戊二烯、丁二烯、乙烯/丁烯(氢化丁二烯)、乙烯/丙烯(氢化异戊二烯)、以及它们的混合物。
可采用的其它合适的热塑性聚合物为茂金属聚烯烃,它们为利用单位点或茂金属催化剂制备的乙烯聚合物。其中,至少一种共聚单体可与乙烯聚合以制备共聚物、三元共聚物或更高级的聚合物。同样适用的是无定形聚烯烃或无定形聚α-烯烃(APAO),它们为C2至C8α烯烃的均聚物、共聚物或三元共聚物。
在示例性实施方案中,增粘树脂通常具有低于5,000的Mw和通常高于室温的Tg;热熔融状态的树脂的典型浓度在约30%至约60%的范围内;并且增塑剂具有低通常小于1,000的Mw和低于室温的Tg,其典型浓度为约0%至约15%。
在某些实施方案中,热塑性粘合剂材料68和76以纤维形式存在。在一些实施方案中,这些纤维将具有约1微米至约50微米或约1微米至约35微米的平均粗度和约5mm至约50mm或约5mm至约30mm的平均长度。为了改善热塑性粘合剂材料68和76对基底64和72或任何其它层尤其是任何其它非织造材料层的粘附性,可将此类层用辅助粘合剂进行预处理。
在某些实施方案中,热塑性粘合剂材料68和76将符合以下参数中的至少一个,或数个,或全部:
一种示例性热塑性粘合剂材料68和76可具有在20℃下测定的至少30,000Pa,并且小于300,000Pa,或小于200,000Pa,或介于140,000Pa和200,000Pa之间,或小于100,000Pa的储能模量G′。在另一个方面,在35℃下测定的储能模量G′可大于80,000Pa。在另一个方面,在60℃下测定的储能模量G′可小于300,000Pa且超过18,000Pa,或超过24,000Pa,或超过30,000Pa,或超过90,000Pa。在另一个方面,在90℃下测定的储能模量G′可小于200,000Pa且超过10,000Pa,或超过20,000Pa,或超过30,000Pa。在60℃和90℃下测定的储能模量可为热塑性粘合剂材料在高环境温度下的形态稳定性的量度。如果吸收产品是在炎热的气候中使用,则该值是特别重要的。如果60℃和90℃下的储能模量G′不是足够高,则在所述气候中热塑性粘合剂材料会失去其完整性。
G′使用如图9示意地所示的流变仪来测定;该图仅用于一般举例说明的目的。流变仪127能够向粘合剂施加剪切应力,并且测量在恒定温度下所引起的应变(剪切变形)响应。将粘合剂放置在用作下固定板128的Peltier元件和半径R为例如10mm的上板129之间,所述上板连接到马达的传动轴上以产生剪切应力。两板之间的间隔高度为H,例如1500微米。Peltier元件能控制材料的温度(+0.5℃)。应当选择应变速率和频率,使得所有测量均在线性粘弹区域中进行。
吸收芯14也可包括未在各图中示出的辅助粘合剂。辅助粘合剂可在涂敷吸收性粒状聚合物材料66和74之前沉积在各自的第一和第二吸收层60和62的第一和第二基底64和72上,以便增强吸收性粒状聚合物材料66和74以及热塑性粘合剂材料68和76对各自的基底64和72的粘附性。辅助胶也可帮助固定吸收性粒状聚合物材料66和74,并且可包括如与上文所述相同的热塑性粘合剂材料;或也可包括其它粘合剂,包括但不限于可喷涂的热熔性粘合剂例如H.B.Fuller Co.St.Paul,MN)的产品号HL-1620-B。辅助胶可以任何合适的方法施加到基底64和72上,但根据某些实施方案,可按间隔开约0.5mm至约2mm的约0.5mm至约1mm宽的狭槽施加。
图4所示的覆盖层70可包括与基底64和72相同或不同的材料。在某些实施方案中,用于覆盖层70的合适的材料为非织造材料,通常为如上所述的适用于基底64和72的材料。
在一个实施方案中,吸收芯14可被芯包裹材料包裹。在一个实施方案中,芯包裹材料包括顶层和底层。芯包裹材料、顶层或底层能够以非织造材料来提供。这种芯包裹物能够以两个或更多个独立的材料片来提供,或作为另外一种选择它们能够以一体的材料片来提供。一体的材料片可包裹在存储层60的周围,例如以C形折叠的形式包裹。
在本发明的另一方面,提供了一种一次性吸收制品,所述吸收制品包括具有顶片和底片的底座、以及位于顶片和底片之间并且大体上不含纤维素的吸收芯。该吸收芯具有当制品被穿着时朝穿着者定向的面向穿着者侧和相对的面向衣服侧。在图15至17所示的某些实施方案中,吸收芯214可包括(i)存储层274,所述存储层包括吸收性粒状聚合物材料并且具有面向穿着者侧和相对的面向衣服侧;(ii)第一芯部包裹片264,所述第一芯部包裹片覆盖存储层的面向穿着者侧;和(iii)第二芯部包裹片272,所述第二芯部包裹片覆盖存储层274的面向衣服侧。第一芯部包裹片264沿至少一个横向密封区282接合到第二芯部包裹片272上。在某些实施方案中,片272和264均沿它们的纵向周边接合。在其它实施方案中,它们沿横向周边接合,或沿纵向周边和横向周边接合。该接合可使用连续图案或非连续图案来实现,所述图案可为线性图案或曲线图案。
第一和第二芯部包裹片264和272可由相同或不同的材料制成。在一个实施方案中,第一和第二芯部包裹片264和272可以非织造纤维网的形式提供。例如,它们能够以聚烯烃例如聚丙烯来提供。在一个实施方案中,这些非织造材料可包括SMS材料结构(即,纺粘层/熔喷层/另一个纺粘层)。在某些实施方案中,永久性亲水的非织造材料(具体地讲为具有永久性亲水涂层的非织造材料)是所期望的。在另一个实施方案中,第一和第二芯部包裹片264和272可包括SMMS结构。在某些实施方案中,这些非织造材料为多孔的,并且在一个实施方案中它们具有约32微米的孔径。在某些实施方案中,合适的非织造材料可包括但不限于合成纤维,例如PE、PET和PP。可将本身疏水的聚合物涂覆上亲水涂层。在某些实施方案中,第一和第二芯部包裹片264和272可具有约3g/m2至约50g/m2,例如约5g/m2至约30g/m2,或约8g/m2至约15g/m2的基重。
存储层274包括吸收性粒状聚合物材料并且大体上不含纤维素。该吸收性粒状聚合物材料可为本领域已知的或如上文所述的超吸收材料或吸收胶凝材料。在一个实施方案中,存储层274包括吸收性粒状聚合物材料和热塑性粘合剂组合物。热塑性粘合剂组合物可用来将吸收性粒状聚合物材料的颗粒固定在一起,例如固定成一体的结构或离散的区域,或可用来将颗粒固定到第一和第二芯部包裹片或其它基底材料上。存储层274还可包括少量(通常小于约10%)的非液体吸收材料,例如粘合剂、蜡、油等。在一个实施方案中,存储层274基本上由吸收性粒状聚合物材料加上热塑性粘合剂组合物组成。
横向密封区282可覆盖某个总面积,所述总面积包括接合带280以及至少一个开口区域。接合带280可包括具有粘结功能的不同元件,在本文中称为粘结元件。例如,粘合元件可由粘合剂粘合、热机粘结、超声波粘结等提供。本文所称的开孔区域是指没有粘合元件存在区域。
有多种使用第一芯部包裹片和第二芯部包裹片来包封存储层274的方法。例如,可使用两个分离的包裹片。第一芯部包裹片覆盖芯的面向穿着者侧,而第二芯部包裹片覆盖芯的面向衣服侧。然后两个包裹片均可沿纵向延伸的接合带接合,其中吸收芯的每一侧设置一个接合带。可供选择地,第一芯部包裹片可与第二芯部包裹片为一整体,并且可由同一材料片提供。因而只需使用一个纵向延伸的接合带来实现包封。这种接合带可位于芯的任一侧边上,或者设置在芯的面向穿着者侧上,或者设置在芯的面向衣服侧上。旨在由所述接合带接合的包裹片材料的重叠端可被布置成能够产生对头密封件或可被布置成能够产生重叠密封件。根据本发明的某些方面,重叠密封件和对头密封件均可使用接合带来接合。
芯部包裹片可由纵向延伸的接合带(例如侧封件)来接合,并且也可由横向延伸的接合带来接合,所述横向延伸的接合带通常设置在吸收芯的前端或吸收芯的后端或吸收芯的这两端。这种横向延伸的接合带可由与纵向延伸的接合带相同的部件提供。
在图15所示的某个实施方案中,粘结元件为粘合剂线。在一个实施方案中,这些线可通过槽式涂布产生,或可通过喷涂法提供。该多个线由多个不含粘合剂的区域隔开。在各种实施方案中,这些线可具有约0.5mm至约2mm的宽度,并且在一个实施方案中为约1mm的宽度。在各种实施方案中,不包括粘合剂的区域可具有约0.5mm至约2mm的宽度,并且在一个实施方案中为约1mm的宽度。当这两种区域具有相同的宽度时,接合带280具有占总面积的50%的开口面积。
一般来讲,根据本发明,密封区可具有占它们的总面积的至少约20%,或至少约30%,或至少约40%,或至少约50%,或至少约60%,或至少约70%,或至少约80%,或至少约90%的开口面积。开口面积不应超过总面积的约95%,以确保可靠的粘结。
为了获得足够的宏观粘结强度,在一个实施方案中,粘合剂线具有超过约100微米的直径。在某些实施方案中,线直径可超过约250微米或可超过约500微米。
接合带在芯部包裹片之间提供某种粘结强度。接合带将在第一方向上具有其最大延伸。本文所称芯部包裹片之间的粘合强度旨在被理解为第二方向上的拉伸强度,所述第二方向垂直于第一方向并且位于由芯部包裹片限定的平面内。为了测试拉伸强度,通过定向在第二方向上的两条切割线在代表性(通常中心)位置切割出2.54cm(1英寸)宽度的测试样本。然后使用此材料测试样本依照ASTM方法D 1876-01测量拉伸强度,所述方法作如下改进:样本长度为60mm,并且其10mm长的未粘结端用于夹持在测试机的夹头中(见D 1876-01的章节5.2)。形成样本一部分的第一和第二芯部包裹片的部分用作柔韧粘附体(见D 1876-01的章节5.1)。而且,拉伸强度被报告(以牛顿除以厘米样本宽度的单位计;N/cm)为所得自动记录曲线的最大值(见D 1876-01的章节8.1)。
在一个实施方案中,接合带280在第一芯部包裹片(第一基底)264和第二芯部包裹片(第二基底)272之间为密封区提供作为纵向上的拉伸强度测量至少约0.5N/cm的粘结强度。在一个实施方案中,接合带280为密封区提供至少约1.0N/cm,约1.5N/cm,约2N/cm,或约3N/cm的粘结强度。
图15至17所示的吸收制品还可包括位于吸收芯和顶片之间的采集系统(未示出)。采集系统不是吸收芯的一部分。
不受理论的束缚,似乎尤其有益的是具有包括相对大开口面积的密封区和接合带。皮肤上凝胶现象的发生似乎部分地由在制造过程中被捕获到这种接合线内的超吸收颗粒所引起。当密封区由连续的粘合剂涂敷来提供时,超吸收材料的溶胀能力由于被提供密封区的粘合剂禁闭而受到限制。然而,一旦制品投入使用并接纳液体,超吸收颗粒就可能溶胀。当此溶胀由于粘合剂的存在而受到高度约束时,溶胀力通常足够大以产生芯部包裹片方向上的溶胀。这些芯部包裹片通常由相对弱的非织造材料或薄纸材料或类似的材料提供。因此,不论在何处,只要密封区自身不提供足够的开口面积以适应超吸收颗粒的溶胀,此类颗粒均将在芯部包裹片的方向上膨胀。因此,颗粒可能穿过芯部包裹片而逸出,常常也对芯部包裹片造成损害。超吸收材料从芯中的这种逸出,特别是逸出密封区的区域之外,似乎明显有助于皮肤上凝胶的发生。然而,如果根据本发明提供具有足够大的开口面积的密封区,则此粘合剂涂敷将导致容纳密封区内的溶胀的更大空间。粘合剂将在密封区内找到足够的开口面积以允许溶胀而不向包裹片和周围的粘合剂材料施加任何压力,或周围的粘合剂材料将有足够的弹性以允许密封区内的溶胀,而同时没有压力或只有极小的压力朝芯部包裹片施加。
鉴于这些考虑,期望在一个实施方案中根据可能从吸收芯214中逸出的超吸收颗粒的尺寸来选择粘结元件的尺度和不含粘结元件的区域的尺度。特别需要考虑的值是超吸收颗粒的平均直径。
平均直径旨在使用题目为“粒度分布”的EDANA方法420.2-02来确定。此EDANA方法为筛分法,并且对于保留在所用的不同筛上的每种粒度级均按百分比报告质量分数。基于此报告,平均直径依照ASTM测试方法D1921-96,即依照其题为“颗粒分布分析”的章节13来计算。
在某些实施方案中,粘结元件的最小尺度可为至少0.2倍的超吸收材料的平均直径(“MD”)。在一个实施方案中,粘结元件的最小尺度可为约0.2倍至约3倍的MD,例如约0.5倍至约2倍的MD,或约0.8倍至约1.2倍的MD。因而粘结元件足够大从而产生宏观理想的粘结强度,并且也足够大从而可靠地捕获和保留在生产过程中被粘结元件夹住的超吸收材料的颗粒。另一方面,它们不会不必要地限制可用的开孔面积。
在某些实施方案中,开口区域的最小尺度可为至少约0.5倍的MD,例如约0.5倍至约10倍的MD,或约1倍至约5倍的MD。于是开孔区域足够大从而允许超吸收颗粒的相对自由的溶胀。
因此,如本发明所述的接合带280在宏级上(当观察总体吸收制品的性能时)提供足够的粘结强度,但同时在微级上(当观察超吸收材料的单个颗粒环境时)提供足够的弱性和溶胀空间。
在一个实施方案中,吸收芯214与吸收芯14类似,因为存储层274以及芯部包裹片264和272呈上文所述的且如图2、图7和图8所示的第一和第二吸收层60和62的形式。在此实施方案中,第一芯部包裹片264为第一吸收层的第一基底;第二芯部包裹片272为第二吸收层的第二基底;并且吸收性粒状聚合物材料沉积在所述第一和第二基底上,并且热塑性材料覆盖各自的第一和第二基底上的吸收性粒状聚合物材料。第一和第二吸收层组合在一起,使得第一吸收层的所述热塑性材料的至少一部分接触第二吸收层的热塑性材料的至少一部分,吸收性粒状聚合物材料在吸收性粒状聚合物材料区域中设置在第一和第二基底之间,并且吸收性粒状聚合物材料大体上连续地分配在吸收性粒状聚合物材料区域上。在一个实施方案中,存储层基本由吸收性粒状聚合物材料组成,所述聚合物材料与热塑性粘合剂组合物一起非连续地分配且图案化在第一和第二芯部包裹片264和272上,然后组合在一起,使得各自的吸收性粒状聚合物材料的图案彼此偏移。
图16显示吸收芯214的另一个实施方案,其中横向密封区包括吸收性粒状聚合物材料(APPM)运动阻碍剂284,所述阻碍剂施加在第一和第二芯部包裹片的横向边缘之间和附近。这种APPM运动阻碍剂可在生产单个吸收芯构件期间在从材料纤维网切割出单个芯构件的相对的末端的过程中施加,例如授予Schmitt等人的美国专利6,562,168中所述。例如,可将包括第一芯部包裹片、存储层和第二芯部包裹片的连续纤维网喂送穿过切割工位,在所述工位处使用一个或多个刀片同时进行如下操作:将APPM运动阻碍剂284在靠近横向密封区区域的离散的位置施加到纤维网上,并且将该纤维网切割成单个吸收构件214。
在一个实施方案中,将足够量的APPM运动阻碍剂284施加到横向端边上以完全密封住末端,因此可防止APPM通过吸收芯214的末端逸出。通过将APPM运动阻碍剂284仅施加到端边上,每个单个吸收芯构件具有一对离散的且空间上隔开的密封区。不将APPM运动阻碍剂施加到整个纤维网上,而是仅施加在离散的且间隔开的各区中,以便获得所需的阻碍APPM通过纤维网的切割端运动的效果,而不会损害吸收芯的性能、舒适性、或其它性质和特性。
将薄的APPM运动阻碍剂284薄膜施加到纤维网上,使得密封区成为相对薄的。然而,APPM运动阻碍剂284可从端边向内迁移。APPM运动阻碍剂284的迁移量一般极小,使得每个密封区具有小于约10cm,小于约5cm,或小于约1cm的宽度尺度。
在一个实施方案中,APPM运动阻碍剂沿横向端边穿过整个吸收芯214从第一芯部包裹片264延伸至第二芯部包裹片272。在一个实施方案中,区286可占据吸收芯214的体积的小于约20%,例如吸收芯214的体积的小于约10%。
用于APPM运动阻碍剂的合适的试剂包括但不限于聚合物溶液或乳液,无论其为天然的(例如天然橡胶胶乳)还是合成的,其中液体为水或任何其它合适的液体或液体的混合物。在一个实施方案中,使用水性乳液。例如,在一个实施方案中,APPM运动阻碍剂可包括丙烯酸类或乙烯基粘合剂聚合物的水性乳液。
用于APPM运动阻碍剂的其它合适的试剂也包括热塑性聚合物或聚合物组合物,它们具有通过ASTM方法E 28“Ring and Ball”确定的在50℃和300℃之间的范围内的软化点。在一个实施方案中,此类热塑性聚合物或聚合物组合物为蜡或包含按重量计至少约50%的蜡的组合物,此类蜡或组合物可具有小于约180℃的软化点。在一个实施方案中,此类热塑性试剂(其为聚合物、蜡或从它们衍生的组合物)为或包含按重量计至少约50%的共聚物,所述共聚物具有(至少作为其共聚单体中的一种)丙烯酸、丙烯酰胺、丙烯酸酯和/或它们的衍生物。
图17显示吸收芯214的另一个实施方案,其中第一芯部包裹片264和第二芯部包裹片272的纵向边缘部分在纵向密封区288处接合。纵向密封区288可包括如上文所述的用于横向密封区的接合带。在一个实施方案中,纵向密封区288包括一个或多个粘合剂线,所述线靠近两纵向边缘延伸大体上吸收芯的长度。
用于制造如本发明的一个实施方案所述的吸收芯14的印刷系统130示出于图10中,并且一般可包括用于形成吸收芯14的第一吸收层60的第一印刷单元132和用于形成吸收芯14的第二吸收层62的第二印刷单元134。
第一印刷单元132可包括用于将辅助粘合剂施加到基底64(其可为非织造纤维网)上的第一辅助粘合剂施用装置136;用于接纳基底64的第一可旋转支撑辊140;用于保持吸收性粒状聚合物材料66的料斗142;用于将吸收性粒状聚合物材料66转移到基底64上的印刷辊144;以及用于将热塑性粘合剂材料68施加到基底64和其上的吸收性粒状聚合物66材料上的热塑性粘合剂材料施用装置146。
第二印刷单元134可包括用于将辅助粘合剂施加到第二基底72上的第二辅助粘合剂施用装置148;用于接纳第二基底72的第二可旋转支撑辊152、用于保持吸收性粒状聚合物材料74的第二料斗154;用于将吸收性粒状聚合物材料74从料斗154转移到第二基底72上的第二印刷辊156;以及用于将热塑性粘合剂材料76施加到第二基底72和其上的吸收性粒状聚合物材料74上的第二热塑性粘合剂材料施用装置158。
印刷系统130也包括导向辊160来用于从第一和第二可旋转的支撑辊140和152之间的辊隙162引导已形成的吸收芯。
第一和第二辅助施用装置136和148以及第一和第二热塑性粘合剂材料施用装置146和158可为喷嘴系统,所述喷嘴系统可提供相对薄但宽幅的热塑性粘合剂材料。
转到图11,示出了第一料斗142、第一支撑辊140和第一印刷辊144的部分。又如图14所示,第一可旋转支撑辊140(其具有与第二可旋转支撑辊152相同的结构)包括可旋转转筒164和用于接纳第一基底64的周向通气支撑网格166。
又如图12所示,第一印刷辊144(其具有与第二印刷辊156相同的结构)包括可旋转转筒168和转筒168的周向表面172中的多个吸收性粒状聚合物材料贮存器170。图13最佳所示的贮存器170可具有多种形状,包括圆柱形、圆锥形、或任何其它形状。贮存器170可通向转筒168中的空气通道174并且包括通气盖176,所述通气盖用于保持贮存器中的粘合剂粒状聚合物材料66并防止粘合剂粒状聚合物材料66掉落到或被吸入到空气通道174中。
在运行中,印刷系统130将第一和第二基底64和72分别接纳到第一和第二印刷单元132和134中,第一基底64被旋转的第一支撑辊140拉动经过第一辅助粘合剂施用装置136,所述施用装置将第一辅助粘合剂以例如上文所述的图案施加到第一基底64上。第一支撑辊140中的真空(未示出)吸动第一基底64顶住竖直支撑网格166并且保持第一基底64顶住第一支撑辊140。这可提供第一基底64上的凹凸表面。由于重力的作用,或通过使用真空部件,基底64将遵循该凹凸表面的轮廓,从而基底64将呈现出峰和谷的形状。吸收性粒状聚合物材料66可在由基底64所提供的谷中积聚。然后第一支撑辊140运载第一基底64经过旋转的第一印刷辊144,所述印刷辊以图5和6最佳所示的网格图案92将吸收性粒状聚合物材料66从第一料斗142转移到第一基底64上。第一印刷辊144中的真空(未示出)可保持贮存器170中的吸收性粒状聚合物材料66,直到要将吸收性粒状聚合物材料66递送到第一基底64上时为止。然后可释放真空或将穿过空气通道174的气流逆转,以将吸收性粒状聚合物材料66从贮存器中排出并落到第一基底64上。吸收性粒状聚合物材料66可在由基底64所提供的谷中积聚。然后支撑辊140运载印刷过的第一基底64经过热塑性粘合剂材料施用装置136,所述施用装置施加热塑性粘合剂材料68以覆盖第一基底64上的吸收性粒状聚合物材料66。
因此,支撑辊140和152的通气支撑网格166的凹凸表面决定了吸收性粒状聚合物材料66和74在吸收芯14中的分配,并且也同样决定了接合区域96的图案。
同时,第二可旋转支撑辊拉动第二基底72经过第二辅助粘合剂施用装置148,所述施用装置将辅助粘合剂以例如上文所述的图案施加到第二基底72上。然后以与上文关于第一印刷单元132所述的相同的方式,第二可旋转支撑辊152运载第二基底72经过第二印刷辊156,所述印刷辊将吸收性粒状聚合物材料74从第二料斗154转移到第二基底72上,并且将吸收性粒状聚合物材料74以网格图案92沉积在第二基底72上。然后第二热塑性粘合剂材料施用装置158施加热塑性粘合剂材料76以覆盖第二基底72上的吸收性粒状聚合物材料74。然后印刷过的第一和第二基底64和72穿过第一和第二支撑辊140和152之间的辊隙162,以便将第一吸收层60和第二吸收层62压缩在一起以形成吸收芯14。
在另一个任选的工序中,可将覆盖层70放置在基底64和72、吸收性粒状聚合物材料66和74、以及热塑性粘合剂材料68和76上。在另一个实施方案中,覆盖层70以及各自的基底64和72可从一体的材料片提供。因而将覆盖层70放置到各自的基底64和72上可涉及对一体的材料片的折叠。
下文所述的测试方法和设备可适用于本发明的测试实施方案:
润湿固定测试
设备
●带刻度的量筒
●秒表(±0.1秒)
●剪刀
●灯箱
●钢笔
●测试溶液:37℃下的0.90%的盐水溶液
●可追溯至NIST,DIN,JIS或其它相当的国家标准的金属直尺
●具有平坦表面内侧且其最小长度为待测量的芯袋长度(n)的PVC/金属盘,并且最大长度为n+30mm,宽度为105mm±5mm,高度为30mm至80mm或等效尺寸
●电子测力仪(量程为0Kg至50Kg)
●润湿固定作用冲击测试设备(WAIIT),设计包装号:BM-00112.59500-R01,得自T.M.G.Technisches Buero Manfred Gruna
设施
标准实验室条件,温度:23℃±2℃,相对湿度:<55%
样品制备
1.打开产品,使顶片侧朝上。
2.展开尿布并且大约每隔2.5cm剪切一下箍弹性部件以避免底座张力。
3.对于套穿产品,打开侧缝并且移除腰带。
4.将芯袋平坦地且将矩形顶片侧朝上地放置到灯箱表面上,不要有任何折叠。
5.开启灯箱以清楚地确认吸收芯外边缘。
6.用直尺在前后吸收芯外边缘处各划一线。
7.测量这两个标记之间的距离(A),并且将该值除以2,这将是计算的距离(B)。
8.从前标记朝向芯袋的中间测量出计算的距离(B),并且标记它。在此标记处划一条横向上的线。
试验过程
WAIIT校准
1.确保滑板处在下位。打开WAIIT测试器的前门,并且将测力仪的吊钩连接到该WAIIT的上样本夹具上。确保在连接弹簧秤之前夹具是闭合的。
2.用双手在弹簧秤上将滑板朝向上位连续地且尽可能缓慢地上提。在实施期间记录平均值(m1)精确至0.02kg。
3.将滑板尽可能缓慢地向下导向至下位,并且在实施期间记录读取的平均值(m2)精确至0.02kg。
4.计算并报告m1-m2的δ值精确至0.01kg。如果δ值为0.6kg±0.3kg,则继续测量。否则,则需要调节滑板。确保滑板处在下位,并且检查滑道是否有任何污染或损伤。通过晃动滑板检查滑板相对于滑道的位置是否已正确地调节好。为便于滑动,需要有某种间隙。如果不存在间隙,则重新调节系统。
WAIIT测试设定值
●落差为50cm。
●尿布负载(lD)为芯容量(cc)的73%;lD=0.73×cc。
●芯容量(cc)如下计算:cc=mSAPxSAPGV,式中mSAP为存在于尿布中的超吸收聚合物(SAP)的质量,并且SAPGV为超吸收聚合物的自由溶胀容量。超吸收聚合物的自由溶胀容量用WO 2006/062258中所述的方法来确定。存在于尿布中的超吸收聚合物的质量为存在于十个产品中的质量的平均质量。
测试实施
1.将天平复位至零位(配衡),将干燥芯袋放置在天平上,将其称重并报告重量精确至0.1g。
2.用带刻度的量筒测量出适当体积的盐水(0.9%的NaCI溶于去离子水中)。
3.将芯袋(顶片侧向上)平坦地放置进PVC盘中。将盐水均匀地浇注到芯袋上。
4.拿起PVC盘使其在不同的方向上保持倾斜,以允许任何自由液体均被吸收。需要将带有聚合材料底片的产品在最小2分钟的等待时间之后翻转,以便底片下面的液体可被吸收。等待10分钟(±1分钟)以允许所有盐水均被吸收。可有一些水滴保留在PVC盘中。仅使用所限定的PVC/金属盘以保证均一化的液体分配和较少的保留液体。
5.将天平复位至零位(配衡),将润湿芯袋放置在天平上。称重并且报告重量精确至0.1g。折叠芯袋仅一次以使其适配在天平上。检查润湿芯袋重量是否越限(被限定为“干燥芯袋重量+尿布负载±4mL”)。例如,12g的干燥芯袋重量+150ml的负载=162g的润湿芯袋重量。如果天平上的实际湿重介于158g和166g之间,则衬垫可用于晃动。否则,将该衬垫作废并且使用下一个。
6.取下加载的芯袋并且沿横向上的标记线剪切衬垫。
7.将润湿芯袋的后部放置到天平上(m1)。称重并且报告重量精确至0.1g。
8.取下润湿芯并且将末端密封侧夹置在该WAIIT的样本夹持器的顶部夹具中(芯的开口端向下取向)。接着,用样本夹持器的侧部夹具夹置芯的两侧,确保将产品沿整个产品长度固定到样本夹持器上。确保不夹置吸收芯,仅夹置非织造材料;对于一些产品来讲,这意味着仅用阻挡腿箍来固定产品。
9.用双手将滑板上提至上位,直到该板被接合。
10.关闭安全前门并且释放滑片。
11.将天平复位至零位(配衡),将测试的芯袋从WAIIT中取出并且将其放置在天平上(m2)。报告重量精确至0.1g。
12.对于润湿芯袋的前部,重复步骤7至11。
报告
1.记录干燥芯袋重量精确至0.1g。
2.在(m1前部/后部)测试之前和在(m2前部/后部)测试之后记录湿重,均精确至0.1g。
3.计算并报告平均重量损失(Δm)精确至0.1g:Δm=(m1前部+m1后部)-(m2 前部+m2后部)
4.按百分比计算并报告重量损失(Δmrel)精确至1%:(Δmrel)=(((m1前部+m1后部)-(m2前部+m2后部))×100)/(m1前部+m1后部)
5.如下计算并报告润湿固定作用(WI):WI=100%-Δmrel
本文所引用的所有转让给Procter&Gamble Company的专利和专利申请(包括在其上公布的任何专利)均引入本文,以供在与其一致的范围内参考。
本文所公开的量纲和值不旨在被理解为严格地限于所述的精确值。相反,除非另外指明,每个这样的量纲均是指所引用的数值和围绕该数值的功能上等同的范围。例如,公开为“40mm”的量纲旨在表示“约40mm”。
在发明详述中引用的所有文件都在相关部分中以引用方式并入本文中。对于任何文件的引用不应当解释为承认其是有关本发明的现有技术。当本发明中术语的任何含义或定义与以引用方式并入本文的文件中术语的任何含义或定义矛盾时,应当服从在本发明中赋予该术语的含义或定义。
虽然已经举例说明和描述了本发明的具体实施方案,但是对于本领域的技术人员来说显而易见的是,在不背离本发明的实质和范围的情况下可以做出多个其它改变和变型。因此,权利要求书意欲包括在本发明范围内的所有这样的改变和变型。

Claims (10)

1.一种一次性吸收制品,所述吸收制品包括:
底座,所述底座包括顶片和底片;和
大体上不含纤维素的吸收芯,所述吸收芯位于所述顶片和所述底片之间并且具有当所述制品被穿着时朝穿着者定向的面向穿着者侧和相对的面向衣服侧,所述吸收芯包括
(i)存储层,所述存储层包括吸收性粒状聚合物材料并且具有面向穿着者侧和相对的面向衣服侧;
(ii)第一芯部包裹片,所述第一芯部包裹片覆盖所述存储层的面向穿着者侧,所述第一芯部包裹片为用于第一吸收层的第一基底;和
(iii)第二芯部包裹片,所述第二芯部包裹片覆盖所述存储层的面向衣服侧,所述第二芯部包裹片为用于第二吸收层的第二基底,
其中:
所述第一芯部包裹片沿至少一个横向密封区接合到所述第二芯部包裹片上,所述横向密封区覆盖总面积,
所述存储层、所述第一芯部包裹片、和所述第二芯部包裹片在一起构成所述第一和第二吸收层,并且
所述吸收性粒状聚合物材料沉积在所述第一和第二基底上,并且热塑性粘合剂材料覆盖所述各自的第一和第二基底上的吸收性粒状聚合物材料,所述第一和第二吸收层组合在一起,使得所述第一吸收层的热塑性粘合剂材料的至少一部分接触所述第二吸收层的热塑性粘合剂材料的至少一部分,所述吸收性粒状聚合物材料在吸收性粒状聚合物材料区域中设置在所述第一和第二基底之间,并且所述吸收性粒状聚合物材料大体上连续地分配在所述吸收性粒状聚合物材料区域上。
2.如权利要求1所述的一次性吸收制品,其中所述横向密封区包括占所述总面积的至少20%或占所述总面积的30%至95%的开口面积。
3.如前述任一项权利要求所述的一次性吸收制品,其中所述横向密封区包括被不含粘合剂的多个区域隔开的多个粘合剂线,其中所述横向密封区中的不含粘合剂的区域所具有的宽度为所述吸收性粒状聚合物材料的平均直径的至少0.5倍,其中所述线具有100微米至2毫米的直径。
4.如前述任一项权利要求所述的一次性吸收制品,其中所述横向密封区包括吸收性粒状聚合物材料运动阻碍剂,所述阻碍剂被施加在所述第一和第二芯部包裹片的横向边缘之间和附近。
5.如前述任一项权利要求所述的一次性吸收制品,其中所述第一芯部包裹片还沿至少一个纵向密封区接合到所述第二芯部包裹片上。
6.如前述任一项权利要求所述的一次性吸收制品,其中所述纵向密封区包括至少一个粘合剂线,所述线大体上延伸所述吸收芯的长度。
7.如前述任一项权利要求所述的一次性吸收制品,其中所述吸收性粒状聚合物材料以各自的着陆区域和所述着陆区域之间的接合区域的图案的形式设置在所述第一和第二基底上,使得所述吸收性粒状聚合物材料非连续地分配在所述第一和第二基底上;并且所述第一和第二吸收层组合在一起,使得所述各自的吸收性粒状聚合物材料的图案彼此偏移,其中所述吸收芯具有前端和后端以及从所述后端延伸至所述前端的纵向轴线,并且所述各自图案的着陆区域排列成网格,所述网格设置成与所述吸收芯的纵向轴线成5至85度,或10至60度,或15至30度的角度,其中所述吸收芯具有从后端延伸至前端的长度、以及从第一边缘延伸至第二边缘并且垂直于所述长度的宽度,并且所述各自的图案在平行于所述长度的方向和平行于所述宽度的方向上均彼此偏移。
8.如前述任一项权利要求所述的一次性吸收制品,其中所述吸收性粒状聚合物材料区域大体上完全地在所述吸收芯上延伸。
9.如前述任一项权利要求所述的一次性吸收制品,其中所述吸收芯具有前端和后端以及从所述后端延伸至所述前端的纵向轴线、以及多个吸收区,所述多个吸收区中的每一个具有以不同的量存在的吸收性粒状聚合物材料以及吸收性粒状聚合物材料的量从所述多个吸收区中的一个吸收区到另一个吸收区的逐渐过渡。
10.如前述任一项权利要求所述的一次性吸收制品,其中所述吸收制品为尿布,所述尿布包括接合到所述底座上的用于将所述尿布固定到穿着者身上的可重新闭合的扣紧系统,或者所述吸收制品为裤型尿布,所述裤型尿布包括接合到所述底座上并且彼此接合以形成裤的至少两个侧片。
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