CN1226294A - 改进了柔软度的湿擦拭巾 - Google Patents

改进了柔软度的湿擦拭巾 Download PDF

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CN1226294A
CN1226294A CN97196662A CN97196662A CN1226294A CN 1226294 A CN1226294 A CN 1226294A CN 97196662 A CN97196662 A CN 97196662A CN 97196662 A CN97196662 A CN 97196662A CN 1226294 A CN1226294 A CN 1226294A
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wet wipes
layer
fiber
natural fabric
skin
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CN1097117C (zh
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J·D·阿蒙德森
J·C·埃克尔特
M·G·埃韦尔森
D·M·杰克逊
W·T·舒尔茨
C·A·史密斯
D·C·斯特拉克
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Kimberly Clark Worldwide Inc
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Abstract

一种改进了的湿擦拭巾,它包含有一个多层的基底片材,能够给擦拭巾提供一种在单层基底片材时所不可能提供的独特性能组合。所述的层状基底片材包含有至少两层,该两层中包含有不同的纤维并具有不同的物理性能。其中的一层可以包含有聚乙烯纤维,在使用时提供给使用者一种温柔柔软的手感,用于接触使用者的皮肤,而另外的层中包含有聚丙烯纤维,提供给擦拭巾强度和弹性,以便在使用时承受使用者所施加的力,保持其形状和整体一致性。

Description

改进了柔软度的湿擦拭巾
发明背景
发明领域
本发明涉及具有改进了的柔软度的湿擦拭巾。尤其是涉及包含有一个多层基底片材的湿的擦拭巾，所述的多层基底片材用于提高湿擦拭巾的柔软度和挠性，同时还保持其强度和弹性。
相关领域描述
湿擦拭巾已经是公知的商业消费品，它具有许多种形式。或许，最普通的湿擦拭巾就是被包装在塑料容器中的一叠被浸湿的片材。该种湿擦拭巾由许多种材料通过被合适的擦拭溶液浸湿而制得。这种湿擦拭巾已经被用于婴儿擦拭巾、手擦拭巾、家用清洁擦拭巾、工业擦拭巾等等。
一般来说，这种现有的湿擦拭巾已经包含了一层大体上均质的材料。例如，现有的湿擦拭巾包含有一气流成纺纤维网，所述的纤维在整个网上均匀混合或者分布。所述的擦拭巾已经包含聚合物纤维，诸如聚酯、聚乙烯、聚丙烯以及天然的或合成的纤维诸如纤维素纤维。其他现有的湿擦拭巾已经包含有一个由聚丙烯纤维和纤维素纤维共同形成的纤维网，其中纤维在整个网中被均匀地混合。
然而，所述在其整个厚度上具有均匀混合的纤维的湿擦拭巾，其多种物理性能，诸如柔软度、挠性、强度、整体保持性和弹性这些性能之间的平衡还没有被完全优化。这对于那些需要提高柔软度的使用者来说尤其是如此。例如，某些能够用于湿擦拭巾的纤维刚性较大，能够为湿擦拭巾提供强度和弹性，但是这些纤维不会如其他那些纤维一样柔软或柔韧。而其他一些可以用于湿擦拭巾的纤维比较柔软但是可能不具备足够的湿强度来经受由使用者施加的力。对于婴儿来说，由于擦拭巾的擦拭表面要接触婴儿柔嫩的肌肤，因此，擦拭巾的擦拭表面的柔软度被认为是最重要的。而且，对于能够提供所需性能的不同类型的纤维、例如提供强度的纤维和提供柔软度的纤维而言，由于它们彼此的不兼容性导致它们结合在一个均质层中很困难。因此，现实需要那种具备改进了的柔软度和挠性同时又保持擦拭巾的强度、整体保持性和弹性的湿擦拭巾。
发明概述
针对上述困难和问题，本发明提供了新的湿擦拭巾，该湿擦拭巾具备改进了的柔软度和挠性同时具备足够的强度、整体保持性和弹性。
一方面，本发明涉及一种湿擦拭巾，该湿擦拭巾包括一个无纺层状基底片材。所述层状基底片材包括至少两层，这两层彼此面对设置，其中一层所包含的纤维不包含在另外一层中。在一个具体的实施例中，其中一层包含聚乙烯纤维，而另外一层中包含聚丙烯纤维。
另外一方面，本发明还涉及一种多层湿擦拭巾，该多层湿擦拭巾包含有一种液体、一个第一无纺外层、一个第二无纺外层和一个无纺内层。所述的第二无纺外层与第一无纺外层相面对设置，而所述的无纺内层位于两个无纺外层之间。所述的外层包含有与内层不同的纤维。这样，所述外层的结构就能够提供给湿擦拭巾不同的物理性能、如柔软性，同时所述内层的结构能够提供给湿擦拭巾其他的性能、如强度。例如，第一和第二外层可以包含聚乙烯纤维来提供柔软性，而内层可以包含聚丙烯纤维用于提供强度。在一个具体的实施例中，所述的外层包含聚乙烯纤维和天然纤维的混合物，而内层包含聚丙烯纤维和天然纤维的混合物。
另外一个方面，本发明涉及一种生产湿擦拭巾的方法，该方法包括：a)提供一个连续移动的第一无纺材料层；b)提供一个连续移动的第二无纺材料层，所述的第二无纺材料层与第一无纺材料层彼此相对设置用来形成一个层状的无纺基底片材，其中第二层包含的纤维在第一层中不包含；c)将所述层状基底片材在一对回转轧辊之间通过，以便至少将所述的第一层和第二层部分地固定在一起；d)将一种液体加到层状基底片材上；e)将连续移动的层状基底片材切割成单个的片材以形成所述的湿擦拭巾。在一个具体的实施例中，所述的方法进一步还包括提供一个连续移动的第三无纺材料层，该第三无纺材料层相对着第二无纺材料层设置，将第二无纺材料层夹在第一和第三无纺材料层之间而形成层状无纺基底片材。第一和第三无纺材料层可以包含由聚乙烯纤维和天然纤维共同形成的层(coform layer)，而第三无纺材料层可以包含由聚丙烯纤维和天然纤维共同形成的层。
在本发明的各个方面都较好地提供了一种改进了的湿擦拭巾，该改进了的湿擦拭巾包含一个层状无纺基底片材。使用一个层状基底片材能够将不同纤维结合在所述基底片材的不同层中从而提供不同的性能。因此，不同的层可以被配置来为湿擦拭巾提供最优化的物理性能的均衡，所述的物理性能诸如柔软度、挠性、强度、整体保持性和弹性。由此，本发明提供的湿擦拭巾与现有的包含一单层均质层的湿擦拭巾相比，其性能和消费者的接收程度均得到了改进。
发明详述
本发明涉及一种新的湿擦拭巾，该湿擦拭巾具有改进了的柔软度同时又保持足够的强度和弹性，本发明还涉及一种生产前述湿擦拭巾的方法。本发明的湿擦拭巾能够用于婴儿擦拭巾，手擦拭巾，面擦拭巾，化妆用擦拭巾，家用擦拭巾，工业用擦拭巾等等。
本发明的湿擦拭巾包括一个含有一种液体的层状基底片材。所述液体可以是任何能够被湿擦拭巾基底片材吸收的溶液，其可以包含任何合适的能提供所需擦拭性能的组份。例如，所述组份可以是水，软化剂，表面活性剂，芳香剂，防腐剂，螯合剂，ph缓冲剂或者它们的组合物，这些对于本领域普通技术人员是公知的。所述的液体也可以包含洗剂和/或药剂。
在每一个湿擦拭巾中所包含液体的量可以根据用于生产湿擦拭巾的材料类型、所使用液体的类型、用于存放所述湿擦拭巾的容器的类型、以及湿擦拭巾的最终用途而变化。通常，为了提高擦拭性能，每一个湿擦拭巾能够包含重量百分比为擦拭巾干燥重量的大约150％到600％、理想地为大约250％到450％的液体。具体而言，在所述湿擦拭巾中所包含的液体的量为湿擦拭巾干燥重量的大约300％到400％、理想地约为330％。如果液体的量小于上述的范围，湿擦拭巾可能过分干燥，不可能充分完成其性能。如果液体的量多于上述的范围，则所述湿擦拭巾可能过度浸透或浸水，在容器的底部可能会聚集所述的液体。
每一个湿擦拭巾通常为矩形，可以具有任何合适的展开宽度和长度。例如，湿擦拭巾可以具有大约为2.0到80.0厘米、理想地约为10.0到25.0厘米的展开长度，具有大约为2.0到80.0厘米、理想地约为10.0到25.0厘米的展开宽度。一般而言，每一个单个的湿擦拭巾被设置成折叠结构并且一个叠加在另外一个之上从而构成一叠层湿擦拭巾。这种折叠的结构对于本领域技术人员来说是公知的，包括C折叠，Z折叠，1/4折叠结构等。折叠的湿擦拭巾叠层可以被放置在一个容器例如一个塑料桶的内部，以形成一个最终销售给消费者的湿擦拭巾包装。或者，湿擦拭巾可以包含一个连续的材料条，该材料条在每一个擦拭巾之间有穿孔，该材料条可以被设置成一叠层或被卷绕成一个卷以便分发。
本发明所述的湿擦拭巾的层状基底片材包含至少两层具备不同物理性能的材料。通过选择适当的材料配置，所述的层所赋予湿擦拭巾的不同物理性能包括柔软度、弹性，强度，挠性，整体保持性，韧性，吸收性，液体保持性，厚度，抗撕裂性能，表面网纹，悬垂性，手感，可湿性，芯吸性等或者它们的结合。理想地，用于层状基底片材的材料可以被配置成尤其是当其被润湿以后能提供柔软度和挠性且同时保持足够的强度、整体保持性和弹性。例如，湿擦拭巾可以包含至少一层材料，它被配置用来为湿擦拭巾提供强度和弹性，还包含至少另外一层材料，其被配置用来为湿擦拭巾提供柔软温和的擦拭表面。理想地，湿擦拭巾在一个强度和弹性层的每一侧都具有一个柔软的层，以使得擦拭巾的两个暴露的表面具有一个柔软温和的与皮肤接触的表面。
所述湿擦拭巾的每一层能够由多种材料制成，这些材料包括：熔喷材料，共同形成(coform)材料，气流成网材料，梳理粘接(bonded-carded)网状材料，水解缠结(hydroentangled)材料，纺粘材料等等，所述擦拭巾的每一层可以包括合成纤维或天然纤维。理想地，所述的层状基底片材的所有层包含纤维材料，这些纤维材料赋予所述湿擦拭巾一个改进的外观和手感。本发明适合采用的天然纤维的例子包括纤维素纤维诸如木浆纤维，棉纤维，亚麻纤维，黄麻纤维，丝纤维等等。本发明适合采用的热塑性聚合物纤维的例子包括诸如聚丙烯和聚乙烯等聚烯烃，聚酰胺，和诸如聚对苯二甲酸乙二酯等聚酯。其他适合于本发明的合成纤维包括尼龙和人造短纤维。本发明的一个主要的优点是层状基底片材每一层的纤维类型可以不同以在最终的层状基底片材中获得一种特定的物理性能的组合，这种特定的物理性能的组合在一个单一材料层中是不可能获得的。由此，根据本发明不同方面获得的层状基底片材可以包含不同的层，这些不同的层中包含有不同的纤维，这些不同的纤维在一个单一的层中是彼此不相容的。
例如，本发明的层状基底片材可以包含至少一个柔软的和挠性的层，该层中包含有柔软的聚合物纤维，例如线性低密度聚乙烯纤维和/或其他的具有类似性能的聚合物纤维。所述的柔软纤维可以与天然纤维如纤维素纤维结合在一起使用或者不结合在一起使用。层状基底片材可以包括至少一个强固的弹性层，该层可包括具有较高抗拉强度的弹性聚合物纤维，例如聚丙烯纤维和/或具有类似性能的其他聚合物纤维。这些强固的聚合物纤维可以与诸如纤维素纤维等天然纤维结合使用或不与其结合使用。理想地，至少其中一个层包含有诸如纤维素纤维等天然纤维以改进基底片材的厚度和可湿性。天然纤维也可以赋予基底片材孔隙容积，这可以提高它的水分保持性能。
如果层状基底片材的一层由聚合物纤维和天然纤维组合形成，例如，由聚丙烯纤维和纤维素纤维组合形成，则在该层中聚合物纤维和天然纤维之间相对的百分比可以根据湿擦拭巾所需的特性而在一个宽的范围内变化。例如，所述的层可以包含重量百分比占所述层干燥重量的大约20％到95％、较理想地约20％到60％、或者更理想地约30％到40％的聚合物纤维。这样一个聚合物纤维和天然纤维层可以由本领域技术人员公知的任何方法生产。
通常，最好由一个共同形成方法(coform process)形成一个层以便在该层中获得聚合物纤维和天然纤维的更加均匀的分布。这种共同形成的层通常按照下述专利公开的内容生产，它们是于1978年7月11日公告授予Anderson等人的美国专利US4100324；于1986年8月5日公告授予Mcfarland等人的美国专利US4604313；以及于1994年9月27日公告的美国专利US5350624，这些专利在此引入作为参考。一般而言，这种共同形成的层包括热塑性聚合物熔喷微纤维和纤维素纤维通过气体形成的基质，所述的聚合物微纤维例如为聚丙烯微纤维，所述的纤维素纤维例如为木浆纤维。一个共同形成的层通过下述方式形成，即：开始时形成至少一个内含合成纤维或聚合物纤维的主气流，然后将该主气流与至少一个天然纤维或纤维素纤维辅助气流相汇合。主气流和辅助气流在紊流的条件下汇合形成一个整体的气流，该整体的气流具有不同纤维彻底而均匀的分布。该整体气流被导引到一个形成表面上，以便空气形成所述材料层。多个这种共同形成层能够被相继形成以便形成一个多共同形成层的纤维网。
在一个具体的实施例中，本发明的湿擦拭巾包括一个具有三层共同形成层的基底片材，该基底片材包含一个坚固有弹性的内层，该内层设置在两个柔软且有挠性的外层之间。所述坚固有弹性的内层包含一个共同形成层，该层由熔喷聚丙烯微纤维和木浆纤维形成，其中木浆和聚合物的重量比大约从50/50到75/25，理想地为约65/35。合适的聚丙烯可以从Montel公司以商品牌号为MONTEL PF015的产品获得。所述柔软的外层包含一个共同形成层，该共同形成层由熔喷线性低密度聚乙烯微纤维和木浆纤维形成，其中木浆和聚合物的重量比为大约50/50到大约75/25，理想地为大约65/35。一个合适的聚乙烯可以从Dow公司以商品牌号为DOW 6831A的产品获得。
本发明的层状基底片材的不同层中的不同的纤维，例如上文所述的聚丙烯微纤维和聚乙烯微纤维，它们一般不能够彼此相容和粘接在一起。然而，这些不同的纤维可以彼此缠结在一起而获得在各层之间的适当的固定。例如，在一个下述的层状基底片材中，该层状基底片材包含一个聚乙烯纤维和纤维素纤维的共同形成层与一个聚丙烯纤维和纤维素纤维的共同形成层，所述的聚乙烯纤维和聚丙烯纤维可以相互以及与纤维素纤维缠结在一起，并可以至少部分地与纤维素纤维粘接在一起，由此获得各层之间的固定。
这种层间的粘接和缠结可以通过一个热形变过程得以增强，在所述的热形变过程中，所述的层状基底片材从一个被加热的光滑砧辊和一个被加热的花纹辊之间通过。所述的花纹辊可以具有任何凸起的花纹，这些花纹能够提供所需要的缠结和层间的粘接。理想地，所述的花纹辊上具有一个凸起的花纹用于提高层间的连接。由该凸起的花纹在层间形成多个粘接位置，这些粘接位置限定出一个粘接区域，该粘接区域占整个辊的总面积的大约4％到30％。
辊之间的压力和温度必须被均衡以形成一个具有足够强度和整体保持性、同时又保持外层柔软度的基底片材。所述的温度和压力可以根据所采用的用于形成所需湿擦拭巾的纤维的类型而进行变化。在一个具体的实施例中，其中各层中至少有一层为聚乙烯纤维层，至少有另外一层为聚丙烯纤维层，位于辊之间的压力可以为在直线方向上每厘米大约5到90千克，至少其中一个辊的温度可以在大约摄氏65到95度，这些都是为了获得一种改进了的缠结和粘接。在这种温度和压力条件下，聚乙烯纤维就变形，而获得与聚丙烯纤维的机械缠结，且可能也获得与聚丙烯纤维的粘接。由此，各层之间就在不连续的区域获得缠结和粘接，这些不连续的区域按照与花纹辊上凸起的花纹相对应的花纹进行排列。
用于湿擦拭巾的层状基底片材具有的单位重量可以为大约每平方米25到120克，理想地为大约每平方米40到90克。该单位重量也可以根据所述湿擦拭巾的最终用途进行变化。例如，用于擦拭皮肤的合适的基底片材可以具有一个大约为每平方米60到80克、理想地大约为每平方米75克的单位重量。在一个具体的实施例中，该实施例的层状基底片材包含聚丙烯纤维与纤维素纤维的共同形成层以及聚乙烯纤维与纤维素纤维的共同形成层，为了获得改善的柔软度和足够的强度，该层状基底片材具有的单位重量为大约每平方米60到90克，理想地为每平方米约80克。
根据湿擦拭巾所需的不同性能、如强度和柔软度，每一层可以具有不同的单位重量或者可以具有相同的单位重量。例如在一个具有三层共同形成层的基底片材中，该基底片材包含一个聚丙烯纤维和木浆纤维的内层，以及两个聚乙烯纤维和木浆纤维的外层，为了改进性能，该层状物的单位重量可以具有这样一个重量比例，即外层/内层/外层的重量比例为大约10/80/10到40/20/40，理想地为大约25/50/25到33/33/33，更加理想地为大约30/40/30，上述比例都是指占基底片材的总重量的比例。
在一个具体的实施例中，比较理想地是本发明的湿擦拭巾当其被溶液浸湿时能具有足够的强度承受由使用者所施加的力。例如，对于提高了性能的湿擦拭巾的层状基底片材来说，它可以具有下述的抗拉强度，即：在机器方向上为至少大约每厘米1.23牛顿，而在机器的横向方向上为至少大约每厘米0.70牛顿。在这里，机器方向是指材料被生产的方向，而机器的横向方向是指垂直于机器方向的方向。在一个具体的实施例中，层状基底片材中包含有聚丙烯纤维和纤维素纤维的共同形成层以及聚乙烯纤维和纤维素纤维的共同形成层，该层状基底片材具有在机器方向上大约为每厘米1.31到3.50牛顿、在机器的横向方向上大约为每厘米0.84到1.40牛顿的抗拉强度，理想地为在机器方向上为每厘米1.58到1.93牛顿、在机器横向方向上为大约每厘米0.93到1.11牛顿的抗拉强度。在这样的结构中，包含聚丙烯纤维的共同形成层对基底片材的强度起主要作用，而包含聚乙烯纤维的共同形成层提供柔软的表面，以用于接触使用者的皮肤。因此这样一种层状基底片材的抗拉强度比包含聚乙烯纤维的一个单层的抗拉强度要高，并且提供了一个比包含聚丙烯纤维的单层更柔软的表面。
根据本发明各个不同方面的湿擦拭巾的层状基底片材可以在一个生产线上生产，该生产线包含多个单个的成形机组。每个成形机组的结构都能够形成一个具有所需性能的单个的层。例如，第一和最后一个成形机组的结构能够形成柔软的外层，而中间的或者内部成形机组的结构可以形成至少一个坚固和有弹性的内层。在形成过程中，每层纤维之间的机械缠结提供了各层之间的连接，并且在相邻的层之间可以形成粘接，这样就形成了所述的层状基底片材。紧接着也可以在层状基底片材上进行热变形粘接以改进各层之间的连接。
每一个成形机组可以包含适当的装备以便形成所需类型的纤维网。例如，如果每一层包含一个熔喷微纤维和如木浆纤维等天然纤维形成的共同形成层，每一个成形机组就可以包括多个熔喷模，这已经是本领域技术人员公知的了。通常，熔喷法包含熔喷模，该熔喷模的结构能够将熔融的聚合物挤出成细流。然后该聚合物细流由聚集的高速气流而被拉细，将聚合物流变成小直径的不连续的微纤维。与熔喷微纤维流聚集在一起的天然纤维流可以由一个现有的浆料开松辊(pulp picker roll)处理而获得，这对于本领域普通技术人员来说已经是公知的了。
另外，本发明不同方面的湿擦拭巾的一层或更多层可以由不同类型的材料制得，所述不同类型的材料如聚合物微纤维的熔喷片材。例如，坚固和有弹性的内层可以包含一个熔喷聚丙烯纤维层，而柔软的外层可以包含一个如上所述的由聚乙烯和木浆纤维形成的共同形成层。柔软而有挠性的外层可以另外通过不同类型的材料获得，所述的不同类型材料例如为气流法梳理纤维网或者前述的熔喷材料，其可以通过本领域普通技术人员公知的方法而制得。
实施例
下面介绍的例子用于对本发明进行更加详细的理解。具体的材料和参数以举例的方式给出，并不用来限定本发明的保护范围。
例1
根据本发明制得湿擦拭巾。每一个湿擦拭巾包含一个具有三层共同形成层的基底片材，该基底片材包含一个坚固有弹性的内层，该内层设置在两个柔软而有挠性的外层之间。所述坚固有弹性的内层包含一个共同形成层，该层由熔喷聚丙烯微纤维和木浆纤维形成，其中木浆和聚合物的重量比大约为65/35。聚丙烯可以从Montel公司以商品牌号为MONTEL PF015的产品获得。所述柔软的外层包含一个共同形成层，该共同形成层由熔喷线性低密度聚乙烯微纤维和木浆纤维形成，其中木浆和聚合物的重量比为大约65/35。聚乙烯可以从Dow公司以商品牌号为DOW 6831A的产品获得。所述湿擦拭巾具有的内层/外层/内层重量比大约为30/40/30。所述的湿擦拭巾包含一种溶液，该溶液类似于现在已用于KleenexHuggiesUnsentedClassic Baby Wipes，该产品可以从Kimberly-Clark公司获得，该公司在Neenah,Wisconsin设有办事处。所述的湿擦拭巾包含有大约为擦拭巾干燥重量的330％的溶液。
上述湿擦拭巾进行本领域技术人员公知的抓样抗拉强度测试。擦拭巾被放置在一对夹紧装置之间，所述的两个夹紧装置被拉开。拉断擦拭巾所需的力被记录为抗拉强度。在机器方向(MD)和机器的横向方向(CD)都进行测试。湿擦拭巾具有的平均MD抗拉强度为每厘米1.67牛顿(每英寸0.95磅)，平均CD抗拉强度为每厘米1.05牛顿(每英寸0.60磅)。
比较例1
产品KleenexHuggiesUnsented Classic Baby Wipes可以从Kimberly-Clark公司获得，该公司在Neenah,Wisconsin设有办事处。每一个该湿擦拭巾包含一个共同形成的基底片材，该基底片材大约有重量百分比占基底片材干燥重量的65％的纤维素纤维和35％的聚丙烯微纤维。所述的聚丙烯能够从Montel公司以商品牌号为MONTEL PF015的产品而获得。该湿擦拭巾包含大约为基底片材干燥重量的330％的溶液。
该湿擦拭巾进行上述的抓样抗拉强度测试。湿擦拭巾具有的平均MD抗拉强度为每厘米316牛顿(每英寸1.80磅)，平均CD抗拉强度为每厘米1.45牛顿(每英寸0.83磅)。
比较例2
除了聚合物不同之外与比较例1相类似的湿擦拭巾被制得。每一个该擦拭巾都包含一个共同形成的基底片材，该片材含有大约重量百分比占基底片材干燥重量的65％的纤维素纤维和35％的聚乙烯微纤维，这些数值基于而得出。所述的聚乙烯能够从Dow公司以商品牌号为DOW 6831A的产品获得。该湿擦拭巾包含有大约为基底片材干燥重量的330％的溶液。
该湿擦拭巾进行前文所述的抓样抗拉强度测试。该湿擦拭巾具有的平均MD抗拉强度为每厘米0.38牛顿(每英寸0.22磅)，平均CD抗拉强度为每厘米0.28牛顿(每英寸0.16磅)。
例子1和比较例1的湿擦拭巾也都进行有55个参加者的使用测试，所述的参加者使用湿擦拭巾5天时间。然后参加者被问及一些涉及擦拭巾性能的问题。例1(本发明)的湿擦拭巾与比较例1相比，其柔软度更加令人满意。
示例性的例1说明本发明的层状基底片材所提供的湿擦拭巾具有改进了的柔软度，同时还具有足够的强度，该足够的强度能够满足作为湿擦拭巾的功能所需的强度。因此，本发明的各个方面能够较好地提供湿擦拭巾，该湿擦拭巾与现有的湿擦拭巾比较，具有更柔软的性能和足够的强度以及整体保持性。这样的湿擦拭巾提高了消费者的接收程度，能够被较好地用于婴儿擦拭巾，手擦拭巾，面擦拭巾，美容擦拭巾，家用擦拭巾，工业擦拭巾等等。
本发明已经针对其具体的方面进行了详细的说明，应当明白，对于本领域技术人员来说，在理解了上述内容的情况下，可以很容易地作出与这些前述各方面等效的改变和变型。因而，本发明的保护范围应当按照后边所附的权利要求及其任何等同物进行确定。

Claims (36)

1、一种湿擦拭巾，包含一个无纺层状基底片材，该基底片材包含至少两个以彼此相面对关系设置的层，其特征在于，所述层中的至少一层包含有其他层中不包含的纤维。
2、如权利要求1所述的湿擦拭巾，其特征在于，所述层中的至少一层包含有聚乙烯纤维，并且所述层中的至少一层包含有聚丙烯纤维。
3、如权利要求1所述的湿擦拭巾，其特征在于，所述层中的至少一层包含有天然纤维。
4、如权利要求1所述的湿擦拭巾，其特征在于，所述层中的至少一层包含有天然纤维和聚合物纤维的混合物。
5、如权利要求4所述的湿擦拭巾，其特征在于，在所述的至少一个层中所述天然纤维与所述聚合物纤维的重量比例为大约50/50到大约75/25。
6、如权利要求1所述的湿擦拭巾，其特征在于，所述层中的至少一层包含一个由天然纤维和聚合物纤维形成的共同形成层。
7、如权利要求1所述的湿擦拭巾，还包括一种液体，其重量相当于所述湿擦拭巾干燥重量的大约150％到600％。
8、如权利要求1所述的湿擦拭巾，其特征在于，所述湿擦拭巾在机器方向上的抗拉强度至少大约为每厘米1.23牛顿。
9、如权利要求1所述的湿擦拭巾，其特征在于，所述湿擦拭巾具有的总的干燥单位重量为大约每平方米25克到120克。
10、如权利要求1所述的湿擦拭巾，其特征在于，所述各层至少在多个粘接位置处局部地缠结在一起，所述粘接位置在各层之间形成一个粘接区域，其大小占各层间表面面积的大约4％到30％。
11、一种多层的湿擦拭巾，包含：
    a)一种液体；
    b)第一无纺外层；
    c)第二无纺外层，该层与所述第一外层相面对设置；
    d)一个无纺内层，该层位于所述第一外层和第二外层之间，其中所述外层含有与所述内层不同的纤维。
12．如权利要求11所述的湿擦拭巾，其特征在于，所述第一和第二外层包含有聚乙烯纤维。
13．如权利要求11所述的湿擦拭巾，其特征在于，所述内层包含有聚丙烯纤维。
14．如权利要求11所述的湿擦拭巾，其特征在于，所述各层中的至少一层包含有天然纤维。
15．如权利要求11所述的湿擦拭巾，其特征在于，所述第一和第二外层包含有聚乙烯纤维和天然纤维的混合物。
16．如权利要求15所述的湿擦拭巾，其特征在于，在所述各外层中，所述天然纤维与所述聚乙烯纤维的重量百分比为大约50/50到75/25。
17．如权利要求11所述的湿擦拭巾，其特征在于，所述内层包含有聚丙烯纤维和天然纤维的混合物。
18．如权利要求17所述的湿擦拭巾，其特征在于，在所述内层中，所述天然纤维与所述聚合物纤维的重量百分比为大约50/50到75/25。
19．如权利要求11所述的湿擦拭巾，其特征在于，所述层中的至少一层包含有一个天然纤维和聚合物纤维的共同形成层。
20．如权利要求11所述的湿擦拭巾，其特征在于，所述湿擦拭巾包含有重量为所述湿擦拭巾干燥重量的大约150％到600％的液体。
21．如权利要求11所述的湿擦拭巾，其特征在于，所述第一外层、所述内层、所述第二外层的重量比为大约10/80/10到40/20/40。
22．如权利要求11所述的湿擦拭巾，其特征在于，所述湿擦拭巾在机器方向具有的抗拉强度为至少约每厘米1.23牛顿。
23．如权利要求11所述的湿擦拭巾，其特征在于，所述湿擦拭巾具有的总的干燥单位重量大约为每平方米50到90克。
24．如权利要求11所述的湿擦拭巾，其特征在于，所述外层在多个粘接位置处至少部分地与所述内层缠结在一起，所述粘接位置形成一个粘接区域，该粘接区域占相应层之间的表面面积的约4％到30％。
25．一种生产湿擦拭巾的方法，包括：
    a)提供一个连续移动的第一无纺材料层；
    b)提供一个连续移动的第二无纺材料层，该第二无纺材料层相对着所述第一无纺材料层设置，从而形成一个层状的无纺基底片材，其中所述第二层包含有所述第一层中不包含的纤维；
    c)至少局部地将所述第一层和所述第二层固定在一起；
    d)往所述层状基底片材中加入一种液体；以及
    e)将所述连续移动的层状基底片材切成单个的片材，从而形成所述湿擦拭巾。
26．如权利要求25所述的方法，其特征在于，所述第一层包含有一个聚合物纤维和天然纤维的共同形成层。
27．如权利要求26所述的方法，其特征在于，所述第二层包含有一个聚合物纤维和天然纤维的共同形成层。
28．如权利要求27所述的方法，其特征在于，所述第一层包含有聚乙烯纤维，所述第二层包含有聚丙烯纤维。
29．如权利要求25所述的方法，其特征在于，所述第一和第二层至少在一些粘接位置处局部地固定在一起，所述粘接位置形成一个粘接区域，该粘接区域占所述各层之间的总表面面积的大约4％到30％。
30．如权利要求25所述的方法，其特征在于，所述层状基底片材从一对回转轧辊之间通过，以便至少局部地将所述第一和第二层固定在一起。
31．如权利要求30所述的方法，其特征在于，所述轧辊的其中之一被加热，使得所述各层中的其中一层的纤维至少部分地变形，并与所述另一层中的纤维缠结。
32．如权利要求31所述的方法，其特征在于，所述的一个轧辊被加热到大约摄氏65到95度的一个温度。
33．如权利要求25所述的方法，其特征在于，将等于所述层状基底片材干燥重量的大约150％到600％的所述液体加入到所述层状基底片材中。
34．如权利要求25所述的方法，还包括提供一个连续移动的第三无纺材料层，该层面对着所述第二无纺材料层设置，将所述第二材料层夹在所述第一材料层和所述第三材料层之间，从而形成所述层状无纺基底片材。
35．如权利要求34所述的方法，其特征在于，所述第一和第三层包含有聚乙烯纤维，所述第二层包含有聚丙烯纤维。
36．如权利要求34所述的方法，其特征在于，所述第一和第三层包含有聚乙烯纤维和天然纤维的共同形成层，所述第二层包含有聚丙烯纤维和天然纤维的共同形成层。
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