CN101035493B - 吸收性物品用的正面片材 - Google Patents

吸收性物品用的正面片材 Download PDF

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CN101035493B
CN101035493B CN2005800336577A CN200580033657A CN101035493B CN 101035493 B CN101035493 B CN 101035493B CN 2005800336577 A CN2005800336577 A CN 2005800336577A CN 200580033657 A CN200580033657 A CN 200580033657A CN 101035493 B CN101035493 B CN 101035493B
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woven fabrics
fiber
protuberance
heat fusing
range
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CN101035493A (zh
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古田一光
真锅阳子
长原进介
石野雄一
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Kao Corp
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Abstract

本发明提供一种正面片材，其为用于吸收性物品的肌肤接触面的正面片材，其中，相互层叠的第1无纺布(1)和第2无纺布(2)局部地热熔融粘合而形成热熔融粘合部(4)。第1无纺布(1)的热熔融粘合部(4)以外的部分形成朝向穿戴者的肌肤侧突出的凸部(5)，凸部(5)在正面片材的面方向的一个方向(X方向)以及与该方向垂直的方向(Y方向)这两个方向上不连续地大量形成。在各凸部(5)的内部填充有短纤维(3)，热熔融粘合部(4)中基本不存在短纤维(3)。正面片材的各凸部(5)部分的纤维密度的关系为：第1无纺布(1)＜短纤维(3)＜第2无纺布(2)。

Description

吸收性物品用的正面片材
技术领域
本发明涉及适用于一次性尿布、生理用卫生巾、内裤里衬(卫生护垫)、失禁衬垫等吸收性物品的肌肤接触面的正面片材或层叠无纺布。 
背景技术
作为一次性尿布和生理用卫生巾等的正面片材，广泛使用在与穿戴者肌肤接触的面上形成有凹凸的片材。根据具有凹凸的正面片材，由于凹凸的存在，与穿戴者肌肤的接触面积有所减少，因此可以寻求降低发粘感和不透气感。例如，已知一种正面片材，其通过压花加工将具有厚度的片材材料与其它片材材料一体化，将压花产生的压缩部作为凹部，将其它部分作为凸部。但是，就该正面片材而言，能够设计的凸部的性能依赖于片材材料的特性而有所限制。 
另外，在专利文献1中记载了一种吸收性物品的正面构造体，其包含形成成为相互平行的列的多个隆起部的液体透过性的正面片材和在上述隆起部内介于上述正面片材和吸收性芯之间的亲水性素材层。 
另外，在专利文献2中记载了使2张无纺布局部地热熔融粘合并在热熔融粘合部以外的一张无纺布上形成了不连续的凸部的正面片材。 
专利文献1：日本特开平11-318983号公报 
专利文献2：日本特开2004-174234号公报 
但是，对于专利文献1中记载的正面构造体，由于隆起部按照与穿戴者的前后方向平行的方式进行配置，因此具有难以产生侧漏的优点，而另一方面，当给与多量的尿等排泄液时，由于排泄液流过隆起部之间的低处而扩散，因此排泄液沿着穿戴者的前后方向扩散，有从前后方向的端部发生泄露的危险。例如，当用于排泄高粘度排泄液的软便的低月 龄婴儿用的尿布中时，由于软便会在隆起部之间的低处移动，因此有从穿戴者的腹部、背侧产生泄露的危险，另外，即便没达到泄露，由于软便也会沿特定方向广泛扩散，因此更换尿布等时存在可见污垢的问题。这种问题在作为生理用卫生巾的正面片材使用时也同样存在。 
另外，专利文献1记载的正面构造体也将通过亲水性素材层而赋予隆起部以弹性作为目的，由于富于弹性的隆起部沿着特定的方向连续地延伸，因此还有平面方向的柔软性较差的问题。 
另外，专利文献2记载的正面片材由于凸部内为空洞，因此在液体的引入性上存在问题。 
发明内容
本发明提供一种吸收性物品用的正面片材，该片材为用于吸收性物品的肌肤接触面的正面片材，其中，使相互层叠的第1无纺布和第2无纺布局部地热熔融粘合而形成热熔融粘合部，第1无纺布的上述热熔融粘合部以外的部分形成朝向穿戴者的肌肤侧突出的凸部，该凸部在正面片材的平面方向的一个方向以及与该方向相垂直的方向这两个方向上不连续地大量形成，在上述各凸部的内部填充有短纤维，在上述热熔融粘合部中基本上不存在上述短纤维，正面片材的凸部部分的纤维密度按照第1无纺布、上述短纤维、第2无纺布的顺序增高。 
另外，本发明提供一种层叠无纺布，该无纺布为将相互层叠的第1无纺布和第2无纺布局部地热熔融粘合而形成了热熔融粘合部的层叠无纺布，其中，第1无纺布的上述热熔融粘合部以外的部分突出而形成凸部，该凸部在层叠无纺布的平面方向的一个方向以及与该方向相垂直的方向这两个方向上不连续地大量形成，在上述各凸部的内部填充有短纤维，在上述热熔融粘合部中基本上不存在上述短纤维，层叠无纺布的凸部部分的纤维密度按照第1无纺布、上述短纤维、第2无纺布的顺序增高。 
附图说明
图1为放大表示本发明的吸收性物品用的正面片材的主要部分的立体图。 
图2为制造图1所示的正面片材的方法的示意图。 
图3为图2中第1轧辊的主要部分的放大图。 
具体实施方式
以下根据优选的实施方式、参照附图说明本发明。 
图1表示了本发明的吸收性物品用的正面片材的主要部分放大图。图1所示的正面片材10用于一次性尿布、生理用卫生巾、内裤里衬(卫生护垫)、失禁衬垫等吸收性物品的肌肤接触面。 
正面片材10由相互层叠的第1无纺布1和第2无纺布2、以及局部配置在这两个无纺布1、2之间的由短纤维构成的纤维集合体3构成。第1无纺布1形成正面片材10的在穿戴时朝向穿戴者肌肤侧的面(肌肤接触面)，第2无纺布2形成穿戴时朝向吸收体侧的面(非肌肤接触面)。 
第1无纺布1和第2无纺布2被局部地热熔融粘合，由此形成多个热熔融粘合部4。第1无纺布1的上述热熔融粘合部4以外的部分沿着朝向穿戴者肌肤的方向突出，形成多个凸部5。 
凸部5在正面片材10的平面方向的一个方向(图1中的X方向，以下称为X方向)以及与该方向垂直的方向(图1中的Y方向，以下称为Y方向)这两个方向上不连续地形成。即，凸部5与专利文献1记载的正面构造体的隆起部不同，在正面片材10的特定方向上其顶部并不连续地延伸。 
更具体地说，凸部5和热熔融粘合部4按照在X方向上交替地成为一列的方式进行配置，这种列在Y方向上形成多个列。相互邻接的列上的凸部5和热熔融粘合部4分别偏离X方向而配置，更具体地说，偏离半个齿距进行配置。 
另外，本实施方式的正面片材10的X方向与正面片材10的制造工序的流动方向一致，并且与在将正面片材10组装在吸收性物品中时的该吸收性物品长度方向或与其垂直的方向相一致。另外，该正面片材10的X方向与第1和第2无纺布各自的纤维的取向方向相一致。另外，正面片材10在作为整体观察时，其第2无纺布2一侧的面基本平坦，在第1无纺布1一侧上形成起伏大的凹凸。 
在正面片材10的各凸部5的内部填充有短纤维。短纤维形成了纤维集合体3。由短纤维构成的纤维集合体3配置在正面片材10的凸部部分(具有凸部的部分)的第1无纺布1和第2无纺布之间，且分别与两无纺布密合。 
由短纤维构成的纤维集合体3配置在正面片材10的凸部部分(正面片材10上具有凸部5的部分)，在热熔融粘合部4上基本不存在构成纤维集合体3的短纤维。“基本上不存在”的理由是考虑到在正面片材10的制造步骤中即便加以努力将短纤维仅配置在凸部部分上，但少量的短纤维也会配置于热熔融粘合部上的情况较多，从而允许这种少量的短纤维的存在。但是，每单位面积的热熔融粘合部的短纤维量相对于每单位面积的凸部部分的短纤维量的比例(百分率)优选为20重量％以下，更优选为5重量％以下。 
正面片材10的各凸部部分的纤维密度按照第1无纺布1、短纤维(作为纤维集合体3的短纤维)、第2无纺布2的顺序增高。即，各凸部部分的第1无纺布1的纤维密度ρ1、由短纤维构成的纤维集合体3的纤维密度ρ2和第2无纺布2的纤维密度ρ3具有ρ1＜ρ2＜ρ3的关系。 
通过使凸部部分具有这种纤维密度的梯度，能够使尿或月经血等排泄液顺畅地从凸部5的表面移动至纤维集合体3，进而，使其顺畅地移动至第2无纺布2。而且，当一次性地将大量液体供给至正面片材10上时，由于凸部5的存在使第1无纺布的表面积变大，并且由于可以将液体保持在凸部5内的纤维集合体3中，因此可以将液体暂时保持在凸部中。 
各凸部部分的第1无纺布1的纤维密度ρ1、短纤维的纤维密度(作为纤维集合体3的短纤维的纤维密度)ρ2和第2无纺布2的纤维密度ρ3分别可以如下测定。 
测量正面片材10的热熔融粘合部的面积率。测量是将图像读取至图像分析软件NEWQUBE(NEXUS生产、Ver.4.22)中进行。图像的读取如下进行：使用样品的中央部(作为标准使得5～20个热熔融粘合部进入到画面内)、使用2台“サンライトSL-230K2；LPL(株)公司生产”作为光源、通过F支架将CCD相机(HV-37；日立电子(株)公司生产)和透镜(Nikon生产Ai AF Nikol 24mmF2.8D)连接起来。图像的处理是利用“二值化”来特定热熔融粘合部分并计算热熔融粘合部的面积率。 
接着，测量第1无纺布、短纤维层、第2无纺布的单位面积质量。测量中使用切成10cm×10cm的正面片材10，按照热熔融粘合部仅存在于第1无纺布或第2无纺布的任一个上的方式分离为各个无纺布和层(如果在热风下进行分离操作，则容易使热熔融粘合部残留于第1/第2无纺布的一个上)。 
称量无纺布和短纤维层的重量至0.1mg等级，在校正热熔融粘合部分的基础上，算出第1或第2无纺布中不带热熔融粘合部的无纺布和短纤维层的单位面积质量。带有热熔融粘合部的无纺布的单位面积质量是通过从不带热熔融粘合部的无纺布中除去相当于热熔融粘合部分的重量得到的重量进行计算的。确认了在短纤维层中，多数的纤维并未延伸至热熔融粘合部上。 
厚度如下测定，在正面片材10的截面中具有最厚厚度的部位测定第1无纺布、短纤维层、第2无纺布各自的厚度。测量是使用显微镜VH-8000(キ一エンス生产)，以50倍观察截面来进行的。截面是使用フエザ一剃刀(商品号FAS-10、フエザ一安全剃刀(株)生产)裁切得到。对于该截面，记录映有液体吸收前的热熔融粘合部和凸部部分的厚度的图像，进行测量和计算。 
通过所得单位面积质量、厚度进行计算，得到密度。 
第1无纺布1的纤维密度ρ1、短纤维的纤维密度(作为纤维集合体3的短纤维的纤维密度)ρ2和第2无纺布2的纤维密度ρ3优选具有以下关系。 
如果纤维密度ρ1和ρ3与各个无纺布的热熔融粘合部附近密度ρ1e、ρ3e、中间密度ρ1c、ρ3c具有ρ1e＜ρ1c＜ρ1、ρ3e≤ρ3c≤ρ3且ρ3e＜ρ1e的关系，则由于减少了第1无纺布上的液体残留，液体向第2无纺布(热熔融粘合部附近)的移动变得容易，因此正面片材的干爽感提高。 
而且，从不妨碍液体从第1无纺布向第2无纺布(热熔融粘合部附近)移动的观点出发，优选热熔融粘合附近的短纤维层不存在纤维，或者其密度ρ2e小于ρ3e(基本不存在纤维的状态)。就第2无纺布2而言，从液体易于从短纤维层移动且防止液体回渗的观点出发，优选ρ3e≤ρ3c＝ρ3。另外，所谓的热熔融粘合部附近是指距离正面片材10的截面的热熔融粘合部0.5～1mm的位置，中间密度是指热熔融粘合部附近密度的测量位置和纤维密度的测量位置长度的中间位置处的密度。 
根据本实施方式的正面片材10，由凸部部分的纤维密度的梯度产生了良好的液体引入性，而且由不连续的凸部5产生了良好的防止液体流动性，因此排泄在正面片材10上的尿或月经血等从正面片材10的比较狭窄的范围透过该正面片材10而吸收至其下的吸收体中。 
因此，用于吸收性物品中时，从穿戴者的前后左右的任何方向都难以产生泄露，另外，使用后的外观也比较漂亮。而且，正面片材由于平面方向的柔软性优异、X方向和Y方向的任何一个方向都会柔软地弯曲，因此与穿戴者的吻合性提高，另外，还可以使用在要求柔软性的物品或部位中。 
此外，由于凸部部分的纤维密度的梯度，难以产生液体的返潮，与由凸部的存在所产生的膨松性(对肌肤的接触面积小)相辅相成，能够有效地防止穿戴中的发粘感和不透气感。进而，肌肤接触感也显著变好。 
另外，由于在热熔融粘合部4上基本不存在构成纤维集合体3的短纤维，因此可以不用考虑热熔融粘合部的热熔融粘合性，可将多种纤维 用作构成纤维集合体3的短纤维。对于构成纤维集合体3的短纤维的优选例子等在后面叙述。 
从进一步提高上述效果的观点出发，优选正面片材10具有以下构成。 
凸部部分的厚度H(参照图1)优选为0.5～2.5mm，特别优选为0.8～1.7mm。热熔融粘合部4的厚度h(参照图1)优选为15～300μm，特别优选为20～150μm。正面片材10的每单位面积(1cm2)的凸部5的数量优选为1～20个，特别优选为6～10个。 
凸部5的X方向的底部尺寸A(参照图1)优选为0.5～5.0mm，特别优选为1.0～4.0mm。凸部5的Y方向的底部尺寸B(参照图1)优选为1.0～10mm，特别优选为2.0～7.0mm。 
X方向的底部尺寸A和Y方向的底部尺寸B之比(底部尺寸A∶底部尺寸B)优选为1∶1～1∶10，特别优选为1∶2～2∶5。凸部5的底部面积(底部尺寸A×底部尺寸B)优选为0.5～50mm2，特别优选为2～20mm2。 
热熔融粘合部4在X方向上的尺寸C(参照图1)优选为0.1～2mm，特别优选为0.2～1.0mm；在Y方向上的尺寸D(参照图1)优选为0.2～5.0mm，特别优选为0.5～3.0mm。 
作为第1和第2无纺布，可以使用各种公知的无纺布，例如可以使用通过梳理法制造的无纺布、纺粘法无纺布、熔喷法无纺布、射流喷网法无纺布、热辊法无纺布、针刺法无纺布等各种无纺布。在本实施方式的正面片材10中，使用基本不伸缩的无纺布作为第1和第2无纺布。 
从肌肤接触感的观点出发，特别优选使用利用热风法在通过梳理法等得到的纤维网上形成纤维之间的热熔融粘合点的热风法无纺布、热压花法无纺布、气流成网法无纺布、针刺法无纺布等作为第1无纺布。从提高纤维密度、使液体易于从第1无纺布或短纤维层移动的观点出发，特别优选使用利用热辊法在通过梳理法等得到的纤维网上形成纤维之间的热熔融粘合点的热辊法无纺布、热压花法无纺布、纺粘法无纺布、 熔喷法无纺布、射流喷网法无纺布等作为第2无纺布。 
作为第1和第2无纺布的构成纤维，优选使用热熔融粘合性纤维，特别是由热塑性聚合物材料构成的纤维。作为热塑性聚合物材料，可以列举出聚乙烯、聚丙烯等聚烯烃，聚对苯二甲酸乙二酯等聚酯，聚酰胺等。还可以优选使用由这些热塑性聚合物材料的组合构成的芯鞘型复合纤维、并列型复合纤维。第1和第2无纺布除了含有热熔融粘合性纤维之外，还可以含有不具有热熔融粘合性的纤维作为构成纤维的一部分。 
第1无纺布的构成纤维的粗度优选为1.0～3.3dtex，单位面积质量优选为15～30g/m2。第2无纺布的构成纤维的粗度优选为0.1～3.3dtex，单位面积质量优选为10～30g/m2。 
作为构成纤维集合体3的短纤维(填充在凸部5中的短纤维)，如上所述，可以在不考虑热熔融粘合部的热熔融粘合性的情况下使用各种纤维，但优选使用例如以下纤维。 
(1)热熔融粘合性比第1和第2无纺布各自的构成纤维都差的纤维(以下也称为非热熔融粘合性纤维)。 
通过使用非热熔融粘合性纤维，纤维的行为自由地对应于使用时的压力变化，从而提高正面片材10的弹力感。 
所谓的热熔融粘合性比第1(第2)无纺布的构成纤维差的纤维是指在例如构成第1(第2)无纺布的构成纤维的热熔融粘合性树脂的熔点以下的温度下不会熔融的纤维。例如，当第1和第2无纺布由以聚乙烯树脂为主体的纤维构成时，作为构成纤维集合体的短纤维，优选使用熔点高于其的聚对苯二甲酸乙二酯(PET)、聚丙烯(PP)、尼龙、聚酰胺等合成树脂构成的纤维，或者醋酸化人造丝等经过了亲水性调整的半天然纤维。另外，当第1和第2无纺布由以粘胶人造丝、醋酸化人造丝、纸浆为主体的纤维构成时，作为构成纤维集合体的短纤维，优选使用棉纤维、人造丝纤维等。 
非热熔融粘合性纤维的粗度优选为0.5～6.6dtex，特别优选为1.1～3.3dtex；单位面积质量优选为5～50g/m2，特别优选为10～30g/m2。 
(2)潜在卷曲性纤维 
通过使用潜在卷曲性纤维，在正面片材10的制造阶段或在使用正面片材10制造吸收性物品的阶段进行热处理，由此能够赋予凸部5以所需的性状。例如，通过提高卷曲程度并形成相对于压缩的弹性恢复力优异的凸部，或制成毛细管径小的纤维构造体，可以形成液体引入性优异的短纤维和第2无纺布。 
潜在卷曲性纤维是指具有通过加热而表现出螺旋状的三维卷曲并进行收缩的性质的纤维。本说明书中，将表现出螺旋状的卷曲的纤维与表现前的纤维都称为潜在卷曲性纤维。潜在卷曲性纤维包括例如由收缩率不同的2种成分构成的偏心芯鞘型或同心芯鞘型的复合纤维或者并列型的复合纤维。作为其例子，可以列举出日本特开平9-296325号公报或日本专利2759331号说明书中记载的纤维。作为收缩率不同的2种成分(热塑性聚合物等)，可以列举出乙烯-丙烯无规共聚物(高收缩率成分)和聚丙烯(低收缩率成分)的组合、聚对苯二甲酸乙二酯(PET、低收缩率成分)与聚对苯二甲酸乙二酯和间苯二酸(CoPET，高收缩率成分)的组合作为优选的例子。 
纤维集合体3中的上述(1)或(2)的纤维量例如相对于纤维集合体3的重量可以设为50～100％，特别可以设为80～100重量％。作为与潜在卷曲性纤维一起含有的纤维，可以列举出例如作为上述(1)的纤维而例示的纤维。 
构成纤维集合体3的纤维(填充在凸部5中的纤维)是短纤维，即是其平均纤维长为100mm以下的纤维。在将短纤维填充在凸部中时，可以利用通过空气等流体流承载来运送纤维的方法、与第1无纺布重叠成网状后将纤维除去的方法(利用吸引等进行的除去、利用流体进行的纤维的筛分)。构成纤维集合体3的短纤维在通过流体流运送时，其表观纤维长优选为3～15mm，特别优选为5～10mm(特别是使用潜在卷曲纤维时，表观纤维长无论在卷曲表现前后都与运送性有关)。 
从提高从凸部5的表面的液体的引入性的观点出发，优选第1无纺 布1、由短纤维构成的纤维集合体3、第2无纺布2的构成纤维的亲水度按此顺序增高。这三者的亲水度大小可以如下判断，即，通过接触角测量法求出一根纤维上(通过喷雾等)的水滴的纤维表面与水滴的角度，从而进行判断。 
接着，参照图2和图3说明本实施方式的正面片材10的优选制造方法。如图2所示，首先从第1无纺布1的坯布1’中纺出第1无纺布1。另外，从第2无纺布2的坯布2’中纺出第2无纺布2。将纺出的第1无纺布1咬入在周面成为凹凸性状的第1轧辊11与周面上具有成为与第1轧辊的凹凸形状相咬合的形状的凹凸形状的第2轧辊12的咬合部中，赋予第1无纺布1以凹凸形状。 
图3表示了第1轧辊11的主要部分放大图。第1轧辊11是组合多张具有规定齿宽的平齿轮11a、11b··并形成为轧辊状的轧辊。各齿轮的齿宽决定正面片材1的凸部5在Y方向上的尺寸。相邻的齿轮按照其齿的齿距分别偏离半个齿距的方式进行组合。结果，第1轧辊11的周面成为凹凸形状。 
在第1轧辊11的各齿轮的齿槽部上形成有吸引孔13。该齿槽部相对于第1轧辊11的周面上的凹凸形状中的凹部。吸引孔13与鼓风机或真空泵等吸引源(未图示)连通并进行控制，以使在从第1轧辊和第2轧辊的咬合部至第1无纺布1和第2无纺布2的合流部之间进行吸引。因此，通过第1轧辊和第2轧辊的咬合而赋予了凹凸形状的第1无纺布1通过由吸引孔13产生的吸引力密合在第1轧辊的周面上，保持其赋予了凹凸形状的状态。此时，如图3所示，如果预先在相邻齿轮间设置规定空隙G，则不会在第1无纺布上施以不合适的伸展力、由轧辊的凹凸咬合所产生的切断效果即可使第1无纺布1密合在第1轧辊11的周面上。 
接着，通过公知的纤维供给手段14将短纤维13以飞散的状态供给于密合有第1无纺布1的状态的第1轧辊11的周面上。短纤维31承载在一部分覆盖第1轧辊11的通道14a内产生的空气流上而被运送至第1 轧辊11的周面上，通过来自吸引孔13的吸引，选择性地堆积在该轧辊11的凹部内。通道14a内的空气流可以由来自吸引孔13的吸引和/或其它的送风手段(未图示)产生。 
然后，如图2所示，在连续地将第1无纺布1和堆积的短纤维31吸引保持在第1轧辊11周面上的状态下，重叠第2无纺布2，将该重叠的无纺布夹在第1轧辊11和支承辊15之间。此时，预先加热第1轧辊11和支承辊15两者或仅加热支承辊15至规定温度。由此，位于第1轧辊11的凸部上、即各齿轮齿上的第1无纺布1通过热熔融粘合与第2无纺布2接合在一起。 
这样，得到正面片材10。如上所述，正面片材10可以用在一次性尿布、生理用卫生巾、失禁衬垫等吸收性物品中。吸收性物品通常具有液体透过性的正面片材、液体不透过性的背面片材和介于两片材间配置的液体保持性吸收体而构成。 
如上说明的正面片材10还有本发明层叠无纺布的一个实施方式。本发明的层叠无纺布也可以用在吸收性物品的正面片材以外的用途中。 
例如，作为吸收性物品用的片材，可以用于配置在正面片材和吸收体之间的片材、立体褶裥(防漏壁)形成用的片材(特别是形成褶裥内壁的片材)等。另外，作为吸收性物品以外的用途，可以用作清扫片材、特别是以吸收液体为主的清扫片材、或者人用的化妆片材等。用于清扫片材中时，就凸部而言，由于对不平滑的被清扫面的追随性良好，因此优选将第1无纺布侧朝向被清扫面使用。作为化妆片材使用时，就凸部而言，由于在追随对象者的肌肤并表现出按摩效果的同时，能够吸收多余的化妆品(另外使用)和汗，因此优选将第1无纺布侧朝向肌肤侧使用。 
进而，根据药剂的种类选择填充在凸部中的纤维片材，预先或者在使用前吸收各种药剂，由此能够缓慢地释放药剂，表现出对应于药剂的效果。例如，如果是清扫片材，则能够缓慢地释放蜡等保护材料；如果是化妆片材等，则能够缓慢地释放化妆品或保湿剂。 
以上，对于本发明的正面片材和层叠无纺布的实施方式进行了说明，但本发明并不限定于上述实施方式，可以进行适当变更。例如，正面片材(层叠无纺布)10的凸部5可以是四角锥台的形状，也可以是半球状的形状。另外，相互邻接的列上的凸部5和热熔融粘合部4分别偏离X方向的程度可以不是1/2齿距，而分别为1/3齿距、1/4齿距等，还可以是在X方向上没有偏移。 
本发明的吸收性物品用的正面片材和层叠无纺布的防止液体流动性和液体引入性优异，膨松且弹性良好，平面方向的柔软性也高。 

Claims (4)

1.一种吸收性物品用的正面片材，该片材为用于吸收性物品的肌肤接触面的正面片材，其中，相互层叠的第1无纺布和第2无纺布局部地热熔融粘合而形成热熔融粘合部；第1无纺布的所述热熔融粘合部以外的部分形成朝向穿戴者的肌肤侧突出的凸部，该凸部在正面片材的平面方向的一个方向以及在同一平面内与该方向垂直的方向这两个方向上不连续地大量形成；在所述各凸部的内部填充有短纤维，在所述热熔融粘合部中基本不存在所述短纤维；正面片材的凸部部分的纤维密度按照第1无纺布、所述短纤维、第2无纺布的顺序增高。
2.权利要求1所述的吸收性物品用的正面片材，其中，所述短纤维的热熔融粘合性比第1和第2无纺布各自的构成纤维差。
3.权利要求1或2所述的吸收性物品用的正面片材，其中，所述短纤维是表现出螺旋状的卷曲的潜在卷曲性纤维。
4.一种层叠无纺布，其中，相互层叠的第1无纺布和第2无纺布局部地热熔融粘合而形成热熔融粘合部；第1无纺布的所述热熔融粘合部以外的部分突出而形成凸部，该凸部在层叠无纺布的平面方向的一个方向以及在同一平面内与该方向垂直的方向这两个方向上不连续地大量形成；在所述各凸部的内部填充有短纤维，在所述热熔融粘合部中基本不存在所述短纤维；层叠无纺布的凸部部分的纤维密度按照第1无纺布、所述短纤维、第2无纺布的顺序增高。
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