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CN112533570A - 吸收性物品 - Google Patents

吸收性物品 Download PDF

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Publication number
CN112533570A
CN112533570A CN201980051524.4A CN201980051524A CN112533570A CN 112533570 A CN112533570 A CN 112533570A CN 201980051524 A CN201980051524 A CN 201980051524A CN 112533570 A CN112533570 A CN 112533570A
Authority
CN
China
Prior art keywords
cellulose nanofiber
intermediate sheet
nanofiber aggregate
sheet
nonwoven fabric
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
CN201980051524.4A
Other languages
English (en)
Inventor
冈田友记
古川勉
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.)
Daio Paper Corp
Original Assignee
Daio Paper Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daio Paper Corp filed Critical Daio Paper Corp
Publication of CN112533570A publication Critical patent/CN112533570A/zh
Pending legal-status Critical Current

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    • A61F13/53743Absorbent 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 an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
    • A61F13/53747Absorbent 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 an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
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    • A61F13/539Absorbent 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 characterised by the connection of the absorbent layers with each other or with the outer layers
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    • B32LAYERED PRODUCTS
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Abstract

通过简单的方法提高排泄液的扩散性。本发明的吸收性物品的特征在于,具备:透液性的顶片(30),其包含位于正面的部分;含有高吸收性聚合物的吸收体(56),其设置于顶片(30)的背面侧;以及透液性的中间片(40),其设置于顶片(30)与吸收体(56)之间,顶片(30)、中间片(40)以及吸收体(56)至少遍及裆间部或其附近的第1位置和与该第1位置分离的第2位置进行设置,中间片(40)具有至少遍及第1位置和第2位置连续的纤维素纳米纤维集合体的附着部。

Description

吸收性物品
技术领域
本发明涉及短裤型尿布、带型尿布等、或者卫生巾等一次性的吸收性物品。
背景技术
吸收性物品以下述结构为基础:其包含形成正面的顶片、和设在顶片的背面侧的吸收体,排泄到顶片上的排泄液透过顶片后被供给至吸收体,且被吸收体吸收并保持。如公知的那样,吸收体通常含有高吸收性聚合物。
这样的吸收性物品的代表性的吸收性能之一为垂直于厚度方向的方向上的扩散性。通常,在扩散性较低的情况下,需要利用吸收体的一部分来保持排泄液,但由于在高吸收性聚合物的吸收速度上存在限制,因此,如果在高吸收性聚合物将排泄液完全吸收之前在厚度方向上施加有压力等,则担忧发生如下现象(以下,也称作回流):移动到吸收体的排泄液再次返回到顶片上,并附着于肌肤。
作为提高扩散性的手段,已知在吸收体上设置沿着扩散方向的槽等各种手段(例如参照专利文献1)。
现有技术文献
专利文献
专利文献1:日本特开2017-140251号公报
专利文献2:日本特许5502742号公报
发明内容
发明所要解决的课题
可是,以往的扩散性提高手段多伴随有结构变更等大幅的设计变更,难以在使现有设计发挥作用的状态下提高扩散性。
因此,本发明的主要课题在于,通过简单的方法来提高排泄液的扩散性。
用于解决课题的手段
解决了上述课题的吸收性物品如下。
<第1方式>
一种吸收性物品,其具备:透液性的顶片,其包含位于正面的部分;含有高吸收性聚合物的吸收体,其设置于所述顶片的背面侧;以及透液性的中间片,其设置于所述顶片与所述吸收体之间,所述顶片、中间片以及吸收体至少遍及裆间部或其附近的第1位置和与该第1位置分离的第2位置进行设置,其特征在于,所述中间片具有至少遍及所述第1位置和所述第2位置连续的纤维素纳米纤维集合体的附着部。
(作用效果)
纤维素纳米纤维集合体通过如下方式得到:将纤维素纳米纤维的分散液涂敷于附着对象物,然后使其干燥。本发明人进行了深入的研究,结果发现:如果使纤维素纳米纤维集合体附着(固定)于吸收性物品的中间片,则扩散性提高。即,由于纤维素纳米纤维集合体具有高亲水性等,因此,在本吸收性物品中与中间片接触的排泄液以在纤维素纳米纤维集合体的附着部所连续的方向上(即从第1位置朝向第2位置)扩散的方式被促进。因此,即使不进行结构变更等大幅的设计变更(也可以进行),通过仅涂敷纤维素纳米纤维分散液的简单方法也能够提高扩散性。其结果是,在本吸收性物品中,通过吸收体之外的部分的扩散性的提高,使得吸收速度得到提高,从而,更加难以发生回流现象。
并且,在专利文献2中,虽然记载了将纤维素纳米纤维用于吸收性物品的发明,但这是关于耐水性高透气性复合片的发明,并不是关于中间片中的排泄液的扩散性的发明。
<第2方式>
根据第1方式的吸收性物品,其中,所述中间片是无纺布,所述纤维素纳米纤维集合体的附着部具有:无纺布的纤维表面被所述纤维素纳米纤维集合体覆盖而成的覆盖纤维;和覆盖纤维的间隙。
(作用效果)
作为中间片,无纺布是合适的,这种情况下,如果纤维素纳米纤维集合体的附着部具有:无纺布的纤维表面被所述纤维素纳米纤维集合体覆盖而成的覆盖纤维;和覆盖纤维之间的间隙,则不会妨碍透液性,在微观上能够沿着各个纤维、且在宏观上能够沿着附着部所连续的方向提高扩散性。特别是,由于各个覆盖纤维的表面具有高密度和高亲水性,因此,沿着纤维的排泄液的扩散性得到提高。
<第3方式>
根据第2方式的吸收性物品,其中,所述中间片在所述吸收体侧的面上和内部含有所述纤维素纳米纤维集合体,所述中间片中的所述纤维素纳米纤维集合体的含量随着从所述中间片中的所述吸收体侧朝向所述顶片侧而变少。
(作用效果)
纤维素纳米纤维集合体的面积越是增加,则扩散性越会得到提高,但中间片会硬质化。因此,当如本方式这样使纤维素纳米纤维集合体的附着部的含量随着从中间片中的吸收体侧朝向顶片侧而变少时,能够抑制由纤维素纳米纤维集合体所引起的、穿着者的肌肤触感的硬质化。另外,通过使吸收体侧的纤维素纳米纤维集合体的含量相对增多,由此,能够使排泄液扩散至距离穿着者的肌肤更远的位置,从而扩散性的提高和防回流性特别优异。并且,对于这样的结构,仅通过仅在中间片的无纺布的吸收体侧的面上涂敷(单面涂敷)纤维素纳米纤维的分散液就能够容易地制造。
<第4方式>
根据第2或第3方式的吸收性物品,其中,所述纤维素纳米纤维集合体的附着部具有纤维素纳米纤维集合体将所述中间片的纤维相互交联而成的交联部。
(作用效果)
如果具有这样的交联部,则能够在不损害透过性的情况下进一步提高扩散性。
<第5方式>
根据第1~4中的任意1个方式的吸收性物品,其中,所述中间片是厚度为0.3mm~1.0mm、构成纤维的纤度为2dtex~10dtex、单位面积重量为20g/m2~50g/m2的短纤维无纺布,所述纤维素纳米纤维集合体的附着部含有2g/m2~5g/m2的纤维素纳米纤维。
(作用效果)
如果中间片的材料是这样的膨松的无纺布,则能够使顶片从吸收体侧分离,从而缓冲性和防回流性优异,因此是优选的,但是,与厚度方向垂直的方向上的液体扩散性变差。可是,即使是这样的短纤维无纺布,若是如前述那样具有纤维素纳米纤维集合体的附着部,则能够对液体扩散性进行补充。
并且,在本方式中所示的“厚度”是指利用KATO TECH株式会社的自动化压缩试验机“KES-G5”并通过2cm2的圆形加压板对作为计测对象的无纺布施加0.196N/cm2的压力时的厚度。
<第6方式>
根据第1~5中的任意1个方式的吸收性物品,其中,呈细长状连续的所述纤维素纳米纤维集合体的附着部遍及所述中间片的面积的50%以上的范围隔开间隔地配置,纤维素纳米纤维集合体的附着部的面积占所述中间片的面积的面积率为10%~30%。
(作用效果)
纤维素纳米纤维集合体的附着部的面积越是增加,则扩散性越会得到提高,但中间片会硬质化。因此,若是如本方式这样使纤维素纳米纤维集合体的附着部形成为细长状,并遍及中间片的广大范围隔开间隔地、且以规定的面积率进行配置,则能够在提高扩散性的同时抑制硬质化,不容易损害吸收性物品的柔软的合身感和柔软感。
发明的效果
根据本发明,通过简单的方法提高了排泄液的扩散性。
附图说明
图1是示出带型一次性尿布的正面的、将尿布展开的状态下的俯视图。
图2是示出带型一次性尿布的背面的、将尿布展开的状态下的俯视图。
图3是沿图1中的6-6线的剖视图。
图4是沿图1中的7-7线的剖视图。
图5是沿图1中的8-8线的剖视图。
图6是沿图1中的9-9线的剖视图。
图7是沿图1中的5-5线的剖视图。
图8是示出纤维素纳米纤维的涂敷形态的剖视图。
图9是示出纤维素纳米纤维的涂敷形态的剖视图。
图10是示出纤维素纳米纤维的涂敷形态的剖视图。
图11是示出纤维素纳米纤维的涂敷形态的剖视图。
图12是示出片的重叠的说明图。
图13是示出纤维素纳米纤维集合体的附着部的配置的说明图。
图14是示出纤维素纳米纤维集合体的附着部的配置的说明图。
图15是设有纤维素纳米纤维集合体的附着部的中间片的截面照片。
图16是设有纤维素纳米纤维集合体的附着部的中间片的表面照片。
具体实施方式
图1~图7示出了带型一次性尿布的一例,图中的标号X表示尿布的除连结带之外的全宽,标号Y表示尿布的全长。各构成部件能够在适当的部位接合于相邻的部件。剖视图中的点纹部分表示作为其接合手段的粘接剂。部件间的基于粘接剂的接合能够通过例如热熔粘接剂的整面涂敷、线状(ビード)涂敷、帘(カーテン)涂敷、关键部位(サミット)涂敷或螺旋涂敷、或者图案涂布(通过凸版方式实现的热熔粘接剂的转印)等来进行,或者,对于弹性部件的固定部分,能够取代上述的涂敷或者与上述的涂敷一起通过涂敷枪或上胶涂敷等针对弹性部件的外周面的涂敷来进行。作为热熔粘接剂,例如存在EVA系、粘合橡胶系(弹性体系)、烯烃系、聚酯聚酰胺系等种类的粘接剂,能够无需特别限定地使用(其中,该粘接剂不含纤维素纳米纤维)。作为将各构成部件接合起来的接合手段,也可以采用热封或超声波密封等基于材料熔接的手段。
该带型一次性尿布具有:吸收体56;透液性的顶片30,其覆盖吸收体56的正面侧;不透液性树脂膜11,其覆盖吸收体56的背面侧;以及外装无纺布12,其覆盖不透液性树脂膜的背面侧,且构成制品背面。标号F表示比前后方向中央靠前侧的腹侧部分,标号B表示比前后方向中央靠后侧的背侧部分。
如图1和图2所示,本例的带型一次性尿布具有裆间部A2和向其前后两侧延伸的部分A1、A3。在此,裆间部A2是指与穿着者的裆间对应的部分。例如在吸收体56的前后方向中间的宽度以沿着腿围的方式变窄的情况下,能够将裆间部A2设为该变窄的部分(收窄的部分)的前后方向范围。另外,裆间部A2也可以是例如将吸收性物品在前后方向LD上三等分时的中央的部分。
以下,对各部分的材料和特征部分依次进行说明。
(吸收体)
吸收体56包含高吸收性聚合物,是吸收并保持排泄液或血液等体液的部分。作为吸收体56,能够恰当地采用高吸收性聚合物被纤维的集合体保持的结构、或者高吸收性聚合物被透液性的片夹住的结构等、公知的结构。作为纤维集合体,除了对绵状纸浆或合成纤维等短纤维进行积纤而成的集合体之外,还可以使用根据需要而对醋酸纤维素等合成纤维的丝束(纤维束)进行开纤而得到的长丝(filament)集合体。作为纤维的单位面积重量,在对绵状纸浆或短纤维进行积纤的情况下,例如可以是大约100~300g/m2,在长丝集合体的情况下,例如可以是大约30~120g/m2。合成纤维的情况下的纤度例如为1~16dtex,优选为1~10dtex,更优选为1~5dtex。在长丝集合体的情况下,长丝也可以是非卷曲纤维,但是优选为卷曲纤维。卷曲纤维的卷曲度例如可以为每2.54厘米5~75个,优选为10~50个,更优选为大约15~50个。另外,可以使用均匀地卷曲的卷曲纤维。
(高吸收性聚合物粒子)
吸收体56所含有的高吸收性聚合物的形状并不特别限定,但优选为粒子状。关于高吸收性聚合物粒子,除了“粒子”以外还包含“粉末”。作为高吸收性聚合物粒子54,可以直接使用在这种吸收性物品中使用的高吸收性聚合物粒子。高吸收性聚合物粒子的粒径并不特别限定,但希望是这样的粒径:例如在执行使用了500μm的标准筛(JIS Z 8801-1:2006)的筛选(振动5分钟)、并对在该筛选中落下到筛子下方的粒子执行使用了180μm的标准筛(JIS Z 8801-1:2006)的筛选(振动5分钟)时,残留在500μm的标准筛上的粒子的比例为30重量%以下,且残留在180μm的标准筛上的粒子的比例为60重量%以上。吸收体56所含有的高吸收性聚合物可以是:其全部能够移动,或者一部分或全部被上述的纤维集合体或后述的包装片58那样的其它材料固定。
作为高吸收性聚合物的材料,可以无特别限定地使用,但吸水量为30g/g以上的材料是优选的。作为高吸收性聚合物粒子,有淀粉类、纤维素类、合成聚合物类等高吸收性聚合物粒子,可以使用淀粉-丙烯酸(盐)接枝聚合物、淀粉-丙烯腈共聚物的皂化物、羧甲基纤维素钠交联物和丙烯酸(盐)聚合物等高吸收性聚合物粒子。作为高吸收性聚合物粒子的形状,优选为通常使用的粉粒体状,但是也可以使用其它的形状。
作为高吸收性聚合物粒子,优选使用吸水速度为70秒以下、特别是40秒以下的高吸收性聚合物粒子。如果吸水速度过慢,则容易发生供给到吸收体56内的液体返回到吸收体56外的所谓的回流。
另外,作为高吸收性聚合物粒子,优选采用凝胶强度为1000Pa以上的高吸收性聚合物粒子。由此,即使在形成为膨松的吸收体56的情况下,也能够有效地抑制吸收液体后的发粘感。
高吸收性聚合物的单位面积重量可以根据按照该吸收体56的用途所要求的吸收量来适当地确定。因此,不能一概而论,可以是50~350g/m2。若聚合物的单位面积重量小于50g/m2,则难以确保吸收量。若超过350g/m2,则不但效果饱和,而且由于高吸收性聚合物粒子的过剩而会产生沙沙的不适感。
在含有高吸收性聚合物粒子的吸收体56中,当高吸收性聚合物粒子吸收排泄液而膨胀时,吸收体中的液体的通路缩小,由于该通路的缩小,容易发生吸收体中的液体的扩散性降低的“凝胶阻塞”。通常可以认为:在排泄液容易集中的部位、即裆间部或其附近容易发生凝胶阻塞,如果发生凝胶阻塞,则吸收速度降低,成为容易发生回流的状态。
(包装片)
为了防止高吸收性聚合物粒子脱出,或者为了提高吸收体56的形状维持性,可以将吸收体56作为被包装片58包裹而成的吸收构件50进行内置。作为包装片58,可以使用薄页纸(tissue paper)特别是绉纸、无纺布、聚乙烯层压无纺布、开有小孔的片等。其中,优选是不会使高吸收性聚合物粒子脱出的片。在使用无纺布代替绉纸的情况下,亲水性的SMMS(纺粘/熔喷/熔喷/纺粘)无纺布特别合适,关于其材质,可以使用聚丙烯、聚乙烯/聚丙烯等。关于纤维的单位面积重量,优选为5~40g/m2,特别优选为10~30g/m2
关于该包装片58,除了如图3所示那样利用一张片包裹整个吸收体56的形态外,也可以利用上下2张等多张的片包裹整个吸收体56,也可以省略包装片58。
(顶片)
顶片30是具有透液性的片,可以采用例如有孔或无孔的无纺布、或者多孔性塑料片等。另外,其中的无纺布的原料纤维为何种并没有特别限定。例如可以例示出聚乙烯或聚丙烯等烯烃系、聚酯系、聚酰胺系等合成纤维、人造纤维或铜氨纤维等再生纤维、棉等天然纤维等、或者使用了它们中的两种以上的混合纤维、复合纤维等。另外,无纺布可以通过任何加工来进行制造。作为加工方法,能够例示出公知的方法、例如水刺法、纺粘法、热轧法、熔喷法、针刺法、热风法、点粘法等。例如,若追求柔性、悬垂性,则水刺法是优选的加工方法,若追求膨松性、柔软性,则热轧法是优选的加工方法。
顶片30在前后方向上从制品前端延伸至后端,在宽度方向WD上比吸收体56进一步向侧方延伸,但是,例如在后述的立起褶裥部60的起点比吸收体56的侧缘靠宽度方向中央侧的情况等,可以根据需要进行使顶片30的宽度比吸收体56的全宽短等适当的变形。
(中间片)
在本带型一次性尿布中,为了防止前述的“回流”现象,设有中间片(也被称作“第二片”)40。
作为中间片40,能够例示出与顶片30相同的面料、或者水刺无纺布、纺粘无纺布、SMS无纺布、纸浆无纺布、纸浆与人造纤维的混合片、点粘无纺布或绉纸。热风无纺布特别膨松,因此是优选的。对于热风无纺布,优选采用芯鞘结构的复合纤维,在该情况下,芯所使用的树脂可以为聚丙烯(PP),但优选为刚度高的聚酯(PET)。单位面积重量优选为17~80g/m2,更优选为25~60g/m2。无纺布的构成纤维的纤度优选为2.0~10dtex,更优选为1.7~5dtex。另外,对于构成无纺布的纤维,能够采用长纤维或短纤维。特别是能够使用短纤维,纤维长度可以为35~60mm,优选为40~55mm。为了使无纺布膨松,作为原料纤维的全部或一部分的混合纤维,优选使用芯不在中央的偏芯纤维、中空纤维、或偏芯且中空的纤维。特别是,在由短纤维无纺布构成的中间片中,单位面积重量优选为20~50g/m2
作为中间片40的无纺布,除了能够使用亲水性比顶片30的无纺布高的原料纤维的无纺布外,也能够使用对与顶片30相同的面料赋予亲水剂而成的无纺布。用于中间片40的无纺布的原料纤维并不特别限定,能够使用聚乙烯或聚丙烯等烯烃系、聚酯系、聚酰胺系等的合成纤维。作为构成中间片40的无纺布的加工方法,能够任意使用公知的方法(例如,水刺法、纺粘法、热轧法、熔喷法、针刺法、热风法、点粘法等),但是,特别优选使用具有膨松性的热风法。
构成中间片40的无纺布的克拉克刚度(JIS P 8143(2009))为30~80,特别优选为30~60,且优选比顶片30低。如果刚度高于80,则穿着物品的中间片40部的柔软感会受损,如果低于30,则会导致中间片40所要求的厚度感受损。
图12所示的形态的中间片40具有与顶片30相同的宽度,但也可以比吸收构件50的宽度短且仅配置于中央。中间片40的前后方向长度可以与尿布的全长相同,也可以与吸收构件50的长度相同,也可以处于以接收液体的区域为中心的较短的长度范围内。
利用KATO TECH株式会社的自动化压缩试验机“KES-G5”并通过2cm2的圆形加压板对作为计测对象的无纺布施加0.196N/cm2的压力时的厚度可以为0.3~1mm的范围,更优选为0.6~0.9mm的范围。
优选的是,中间片40与顶片30接合在一起。作为接合方法,能够采用基于热熔粘接剂等的粘接、水刺、热压花、超声波熔接等公知的方法。特别是,当采用热压花时,顶片30成为凹凸状,液体扩散性增加,因此是优选的。在凹凸状的顶片30上,在中间片40侧形成有多个凹的部位。由此,液体仅在顶片30上的特定部位处难以向中间片40侧透过,在多个凹部处容易扩散并透过。
在采用热压花作为接合手段的情况下,对于中间片40的面料,优选使用具有与顶片30同等程度的熔点的面料。优选的是,在所有的凹部处,顶片30和中间片40被接合在一起,但是,也可以具有未接合在一起的部分。
(不透液性树脂膜)
关于不透液性树脂膜11,只要具有透湿性,则不特别限定,例如可以适当地采用通过下述方法获得的微多孔性片:将无机填充剂在聚乙烯或聚丙烯等烯烃系树脂中混炼而成型出片,然后沿单轴或双轴方向拉伸。特别是,不透液性树脂膜11能够采用具有厚度方向上的透湿性的膜,当然,不透液性树脂膜11不包括以无纺布为基材提高了防水性而成的膜。
关于不透液性树脂膜11,优选在前后方向LD和宽度方向WD上遍及与吸收体56相同或更广的范围延伸,但在存在其它阻水手段的情况下等,也可以根据需要形成为在前后方向LD和宽度方向WD上不覆盖吸收体56的端部的形态。
(外装无纺布)
外装无纺布12覆盖不透液性树脂膜11的整个背面侧,使制品背面成为布那样的外观。作为外装无纺布12,并不特别限定,作为面料纤维,除了能够使用例如聚乙烯或聚丙烯等烯烃系、聚酯系、聚酰胺系等合成纤维之外,还能够使用人造丝或铜氨纤维等再生纤维、棉等天然纤维,作为加工方法,能够使用水刺法、纺粘法、热轧法、热风法、针刺法等。但是,在能够兼顾肌肤触感和强度这一点上,纺粘无纺布或SMS无纺布、SMMS无纺布等长纤维无纺布是优选的。除了使用一张无纺织布之外,也能够将多张重叠在一起使用。在后者的情况下,优选通过热熔粘接剂等将无纺织布相互粘接在一起。在使用无纺布的情况下,其纤维的单位面积重量优选为10~50g/m2,特别优选为15~30g/m2
(立起褶裥部)
为了阻止在顶片30上沿着顶片横向移动的排泄物以防止所谓的侧漏,优选在正面的宽度方向WD的两侧设有向穿着者的肌肤侧立起的立起褶裥部60。当然,也可以省略立起褶裥部60。
在采用立起褶裥部60的情况下,其结构并不特别限定,能够采用公知的所有结构。图示例的立起褶裥部60由如下部分构成:实质上在宽度方向WD上连续的褶裥片62;和细长状的褶裥部弹性部件63,其沿前后方向LD以伸长状态固定于该褶裥片62。作为该褶裥片62,可以使用拒水性无纺布,另外,作为褶裥部弹性部件63,可以使用橡胶线等。关于弹性部件,除了如图1和图2所示那样分别设置多根外,也可以分别设置1根。
褶裥片62的正面在顶片30的侧部上具有宽度方向WD上的接合始端,从该接合始端起,宽度方向背面侧的部分借助热熔粘接剂等接合于各侧翼部SF的正面,即,在图示例中,接合于不透液性树脂膜11的侧部和比其靠宽度方向背面侧的外装无纺布12的侧部。
在腿围处,立起褶裥部60的从接合始端起的宽度方向正面侧在制品前后方向两端部被固定于顶片30上,但处于制品前后方向两端部之间的部分为不固定的自由部分,该自由部分借助弹性部件63的收缩力立起而与身体表面紧密接触。
(端翼部、侧翼部)
图示例的带型一次性尿布具有:不具有吸收体56的一对端翼部EF,它们分别向吸收体56的前侧和后侧伸出;和不具有吸收体56的一对侧翼部SF,它们分别比吸收体56的两侧缘进一步向侧方伸出。
(平面褶裥部)
在各侧翼部SF中,以沿着前后方向LD伸长的状态固定有由橡胶线等细长状弹性部件构成的侧弹性部件64,由此各侧翼部SF的腿围部分构成为平面褶裥部。腿围弹性部件64除了如图示例那样在褶裥片62的接合部分中的接合始端附近的宽度方向背面侧设置于褶裥片62与不透液性树脂膜11之间外,也可以设置于侧翼部SF处的不透液性树脂膜11与外装无纺布12之间。腿围弹性部件64除了如图示例那样在各侧设置多根外,也可以在各侧仅设置1根。
(连结带)
在背侧部分B中的侧翼部SF,分别设有与腹侧部分F的背面以能够装卸的方式连结的连结带13。在穿着尿布10时,将连结带13从腰的两侧绕到腹侧部分F的背面,并将连结带13的连结部13A连结于腹侧部分F背面的适当部位。
连结带13的结构并不特别限定,但在图示例中具有:片基材,其构成固定于侧翼部SF的带安装部13C和从该带安装部13C突出的带主体部13B;和针对腹侧连结的连结部13A,其设置于该片基材中的带主体部13B的宽度方向中间部,比该连结部13A靠末端侧的部分成为抓取部。
作为连结部13A,除了设置机械紧固件(面紧固件)的钩件(凸件)外,也可以设置粘接剂层。钩件在其连结面上具有多个卡合突起,作为卡合突起的形状,存在(A)レ字状、(B)J字状、(C)蘑菇状、(D)T字状、(E)双J字状(使J字状的结构背对背地结合而成的形状)等,但也可以是任意的形状。
另外,作为从带安装部13C形成至带主体部13B的片基材,可以采用无纺布、塑料膜、聚乙烯层压无纺布、纸或它们的复合材料,但优选是纤度为1.0~3.5dtex、单位面积重量为20~100g/m2的纺粘无纺布、热风无纺布或水刺无纺布。
(靶片)
优选的是,在腹侧部分F中的与连结带13连结的连结部位设置靶片20,该靶片20具有用于使连结变得容易的靶件。关于靶片20,在连结部13A为钩件的情况下,可以使用在由塑料膜或无纺布构成的片基材的表面设置多个供钩件的卡合突起钩挂这样的环形线而成的靶片,另外,在连结部13A为粘接材料层的情况下,可以采用富有粘接性这样的、对由表面平滑的塑料膜构成的片基材的表面实施剥离处理而成的靶片。另外,在腹侧部分F中的与连结带13连结的连结部位由无纺布构成的情况下,例如在如图示形态那样具有外装无纺布12的情况下,也可以省略靶片20,使钩件钩挂于外装无纺布12的纤维来进行连结。这种情况下,可以在外装无纺布12与不透液性树脂膜11之间设置作为标记的靶片20。
(纤维素纳米纤维)
中间片40具有至少遍及裆间部A2或其附近的第1位置和与该第1位置分离的第2位置而连续的纤维素纳米纤维集合体的附着部15。纤维素纳米纤维是指对纸浆纤维进行开纤而得到的微细的纤维素纤维,通常是指包含平均纤维宽度为纳米尺寸(1nm以上且1000nm以下)的纤维素微细纤维在内的纤维素纤维,但是,平均纤维宽度(中值直径)在100nm以下的纤维素纳米纤维是优选的,平均纤维宽度为10~60nm的纤维素纳米纤维更加优选。另外,纤维素纤维是无数β-葡萄糖主要以β-1,4糖苷键结合的方式结合为链状而成的。β-葡萄糖具有-H基和-OH基等。
关于纤维素纳米纤维,一般来说,纤维宽度为4nm以上且1000nm以下,纤维长度为5μm以上,具有高纵横比(低时为5以上,高时为1250以上),且比表面积较大。并且,其集合体具有较高的亲水性。从而,如果在中间片40中具有纤维素纳米纤维的集合体的附着部15,则扩散性提高。即,与中间片40接触的排泄液以在纤维素纳米纤维集合体的附着部15所连续的方向上(即从第1位置朝向第2位置)扩散的方式被促进。并且,通过该吸收体56之外的部分的扩散性的提高,使得吸收速度得到提高,从而,更加难以发生回流现象。纤维素纳米纤维的集合体可以具有能够实现透气和透液的至少一方的、包含有多个孔的多孔质结构或立体的网状结构,也可以是即使不具有孔或者具有孔但实质上无法实现透气和透液的致密结构。如果纤维素纳米纤维的集合体是具有吸水性的多孔质结构,则上述的扩散性变得更好,因此是优选的。
实际上,在如图16所示那样在中间片40中设置纤维素纳米纤维集合体的附着部15、并将该中间片40的端缘(该图的下部)浸入水中的情况下,水开始在该中间片40中浸透。发明人发现:虽然水在该图中向上部浸透,但是,与未设置纤维素纳米纤维集合体的附着部15的部位相比,在设有纤维素纳米纤维集合体的附着部15的部位,水向上部浸透的浸透速度更快。
关于纤维素纳米纤维集合体的附着部15,只要遍及第1位置和第2位置地连续,则配置并不特别限定。例如,第1位置只要处于裆间部或其附近,则具体的前后方向上的位置和宽度方向上的位置并不限定。另外,第2位置只要与第1位置分离,则可以是与裆间部或其附近的第1位置不同的位置,另外,也可以是比裆间部靠前后至少一侧的任意位置。第2位置可以位于中间片40的缘上,也可以从中间片40的缘离开。
关于第1位置与第2位置的间隔,能够考虑扩散性的提高来适当地决定,但在通常的情况下,优选为中间片40在宽度方向上的尺寸的1/2以上或裆间部在前后方向上的尺寸的1/2以上。具体来说,第1位置与第2位置的间隔优选为30mm以上,特别优选为50mm以上。
另外,关于附着部15连续,当然包含“附着部15连续而不中断”,还包含如下情况:连续(连接)5mm以上而不中断的附着部隔开5mm以下的间隔间断地(呈虚线状地)连续。如果像这样减小间隔,则虽然附着部15间断,但液体仍然被从附着部向附着部传递,与不存在附着部的情况相比,实现了扩散性的提高。
并且,当然,顶片30、中间片40以及吸收体56至少遍及第1位置和第2位置来设置。其中,如前述那样,顶片30、中间片40以及吸收体56只要分别遍及第1位置和第2位置,则可以具有不同的尺寸,也可以具有相同的尺寸。
例如,关于附着部15,优选如图13的(a)所示那样将线状的纤维素纳米纤维集合体的附着部排列成斜格子状。对该形态进行变形而形成为如下的间断形态也是优选的:如图13的(b)所示,在格子的交叉部分不设置纤维素纳米纤维集合体的附着部(这种情况下,如前述那样以5mm以下的间隔间断地排列)。若形成为间断形态,则能够减少纤维素纳米纤维集合体的附着部15的形成量,能够防止中间片40的过度硬质化,从而能够保持柔软性。在纤维素纳米纤维集合体的附着部15为格子状图案的情况下,纤维素纳米纤维集合体的附着部15的线宽优选为1.0~4.0mm,特别优选为2.0~3.0mm。另外,纤维素纳米纤维集合体的附着部15的间隔(格子状图案的情况下为平行的纤维素纳米纤维集合体的附着部15相互的间隔)15d优选为5~30mm,特别优选为10~20mm。
并且,在设置多个附着部15的情况下,只要至少一个附着部15遍及第1位置和第2位置连续,则其它附着部15也可以不满足该条件。例如,对于其它附着部15,也能够如图13的(c)、(d)所示那样将圆状、短线状等的点状纤维素纳米纤维集合体的附着部15以交错配置(图示例)、行列配置(省略图示)等的散点状来设置。在纤维素纳米纤维集合体的附着部15为点状图案的情况下,纤维素纳米纤维集合体的附着部15的直径(最长的部分的长度)优选为1.0~4.0mm,特别优选为2.0~3.0mm。另外,纤维素纳米纤维集合体的附着部15的间隔(在点状图案的情况下,为宽度方向WD和前后方向LD上的间隔)15d优选为5~30mm,特别优选为10~20mm。
关于纤维素纳米纤维集合体的附着部15的配置,可以形成为这样的竖条纹状配置:如图14的(c)所示,沿着前后方向LD的线状的附着部15在宽度方向上隔开间隔地排列有多个,或者,也可以形成为这样的横条纹状配置:沿着宽度方向WD的线状的附着部15在前后方向上隔开间隔地排列有多个。另外,如图14的(d)所示,也能够采用由沿着前后方向LD的线状的纤维素纳米纤维集合体的附着部15和沿着宽度方向WD的线状的纤维素纳米纤维集合体的附着部15构成的格子状的配置。
纤维素纳米纤维集合体的附着部15的线宽优选为1.0~4.0mm,特别优选为2.0~3.0mm。纤维素纳米纤维集合体的附着部15的相互间隔优选为5~30mm,特别优选为10~20mm。
另外,如图14的(b)所示那样将纤维素纳米纤维集合体的附着部15呈波浪线状排列也是优选的。将该波浪线密集排列而成的图14的(a)所示的网状形态也是优选的。
另外,根据图16可知:在设置于中间片40表面的纤维素纳米纤维集合体的附着部15中,中间片40的纤维之间通过纤维素纳米纤维集合体的附着部15而交联。水分子在被吸附到纤维素纳米纤维集合体的附着部15的端缘时,沿着交联的纤维素纳米纤维集合体的附着部15向该图的上方向浸透。并且,基于该纤维素纳米纤维集合体的附着部15的交联不限于中间片40的表面,也发生在构成中间片40的纤维内部。
纤维素纳米纤维的附着部15能够通过如下等公知的方法来制造:使纤维素纳米纤维分散于水等之中,将纤维素纳米纤维分散液涂敷于对象片(即,这种情况下为中间片40)并使其干燥,由此形成。并且,在通过像这样涂敷纤维素纳米纤维分散液的制造方法在纸或无纺布这样的纤维片上涂敷时,纤维素纳米纤维分散液的大部分附着形成于片表面上,剩余的浸透于片内部纤维。
作为一个例子,纤维素纳米纤维分散液是使纤维素纳米纤维分散于水等溶液中而成的。纤维素纳米纤维分散液的浓度(质量/容量)优选为0.1~10%,更优选为1.0~5.0%,特别优选为1.5~3.0%。
纤维素纳米纤维分散液的B型粘度(60rpm,20℃)例如为700cps以下,优选为200cps以下,更优选为50cps以下。通过像这样将纤维素纳米纤维分散液的B型粘度抑制得较低,由此,纤维素纳米纤维被均匀地赋予片表面,片的表面性均匀地提高。
关于纤维素纳米纤维分散液的赋予,除了针对对象面的喷雾外,也可以采用基于凸版方式等的转印方式。
在此,对纤维素纳米纤维的平均纤维宽度的测量方法进行说明。
首先,利用特氟隆(注册商标)制的膜过滤器,对100ml的、固体成分浓度为0.01~0.1质量%的纤维素纳米纤维的水分散液进行过滤,并利用100ml的乙醇进行1次溶剂置换,利用20ml的叔丁醇进行3次溶剂置换。
接着,进行冷冻干燥,并涂布锇而制成试料。对于该试料,根据所构成的纤维的宽度,以5000倍、10000倍以及30000倍中的任意倍率(在本实施例中为30000倍的倍率)进行基于电子显微镜SEM图像的观察。具体来说,在观察图像中引出两根对角线,并任意地引出三根通过对角线的交点的直线。进而,目视计测与这三根直线交错的合计100根纤维的棒。然后,将计测值的中位直径(中值直径)作为平均纤维宽度。
作为能够在纤维素纳米纤维的制造中使用的纸浆纤维,可以列举出:阔叶树木浆(LBKP)、针叶树木浆(NBKP)等化学纸浆;漂白热磨机械浆(BTMP)、磨石磨木浆(SGP)、压力磨石磨木浆(PGW)、精炼磨木浆(RGP)、化学磨木浆(CGP)、高温磨石磨木浆(TGP)、磨木浆(GP)、热磨机械浆(TMP)、化学热磨机械浆(CTMP)、盘磨木浆(RMP)等机械纸浆;由茶纸废纸、工艺信封盲纸、杂志废纸、旧报纸、传单废纸、办公废纸、瓦楞纸废纸、旧白皮书、肯特纸废纸、仿废纸、地券废纸、草纸废纸等制造出的废纸纸浆;以及,对废纸纸浆进行脱墨处理而成的脱墨纸浆(DIP)等。对于这些纸浆,只要不损害本发明的效果,则可以单独使用,也可以将多种组合起来使用。另外,也可以使用对上述纸浆纤维实施羧甲基化等化学处理而成的材料。
作为纤维素纳米纤维的制造方法,可以列举出高压均质法、微射流法、研磨机研磨法、冷冻粉碎法、超声波开纤法等机械方法,但并不限定于这些方法。另外,纳米纤维化通过TEMPO氧化处理、磷酸酯化处理、酸处理等的并用而得到了促进。
纤维素纳米纤维集合体的附着部15只要附着于中间片40的厚度方向上的至少一部分,则可以仅附着于厚度方向上的一部分,也可以附着于厚度方向上的全部。如果纤维素纳米纤维集合体的附着部15在中间片40的正反面中的至少一个面露出,则顶片30侧或吸收体56侧的液体扩散性得到提高,因此是优选的。这种情况下,附着部15可以几乎不存在于中间片40的内部,或者也可以充分地存在至厚度方向的中间。
纤维素纳米纤维集合体的附着部15在中间片40的正反面中的至少一个面露出的结构可以通过如下方式形成:如前述那样将纤维素纳米纤维分散液涂敷于中间片40的正反面中的至少一个面上,并使其干燥。例如,在将纤维素纳米纤维分散液涂敷于中间片40的正面40e上时,通常,该分散液不仅进入(浸透于)被涂敷的正面,而且还进入中间片40内部的纤维中,从而形成纤维素纳米纤维集合体的附着部15。能够通过该向纤维浸透的深度来调整纤维素纳米纤维集合体的附着部15在厚度方向上的分布。例如,如图8所示,可以为:以从中间片正面40e至背面40f维持规定的宽度的方式形成纤维素纳米纤维集合体的附着部15。另外,如图9的(a)所示,也可以为:随着从中间片正面40e朝向背面40f,纤维素纳米纤维集合体的附着部15的含量发生变化。另外,如图10所示,也可以为:仅在中间片40中的厚度方向上的正面40e侧具有纤维素纳米纤维集合体的附着部15(未在背面40f露出)。如图11所示,也可以为:仅在中间片40的正面40e附近具有纤维素纳米纤维集合体的附着部15。并且,在图8~图11中,纤维素纳米纤维集合体的附着部15以点图案表示。
特别优选的是,纤维素纳米纤维集合体附着于中间片40的背面和内部,并且,中间片40中的纤维素纳米纤维集合体的含量随着从中间片40中的吸收体56侧朝向顶片30侧而变少,由此,能够抑制由纤维素纳米纤维集合体所引起的、穿着者的肌肤触感的硬质化。另外,通过使吸收体侧的纤维素纳米纤维集合体的含量相对增多,由此,能够使排泄液扩散至距离穿着者的肌肤更远的位置,从而扩散性的提高和防回流性特别优异。并且,对于这样的结构,仅通过仅在中间片的无纺布的背面涂敷(单面涂敷)纤维素纳米纤维分散液就能够容易地制造。特别优选的是,仅在中间片40中的厚度方向上的背面40f侧具有纤维素纳米纤维集合体的附着部15(未在正面40e露出)。
为了提高中间片40的透液性和液体扩散性,最好使纤维素纳米纤维的量较多,但如果过多,则制品会不必要地变硬。因此,纤维素纳米纤维的含量优选为大约2~7g/m2。特别是,更优选为大约2~5g/m2。如果是该范围,则作为制品,能够充分地确保透液性和液体扩散性。
在对中间片配置呈细长状连续的纤维素纳米纤维集合体的附着部的情况下,可以遍及中间片的面积的50%以上的范围隔开间隔地配置。另外,由在中间片的面积中所占据的纤维素纳米纤维集合体的附着部的面积来定义的面积率可以为10~30%。这样,能够在提高扩散性的同时抑制硬质化,不容易损害吸收性物品的柔软的合身感和柔软感。
作为中间片40,无纺布是合适的,这种情况下,如果纤维素纳米纤维集合体的附着部具有:无纺布的纤维表面被纤维素纳米纤维集合体覆盖而成的覆盖纤维;和覆盖纤维之间的间隙,则不会妨碍透液性,在微观上能够沿着各个纤维、且在宏观上能够沿着附着部所连续的方向提高扩散性。特别是,由于各个覆盖纤维的表面具有高密度和高亲水性,因此,沿着纤维的排泄液的扩散性得到提高。
中间片40能够采用亲水性材料、疏水性材料、以及亲水性和疎水性的混合材料等中的任意材料。特别是,如果对采用了亲水性材料的中间片40设置纤维素纳米纤维集合体的附着部15,则纤维被附着部15牢牢地覆盖,因此是优选的。
图15是设有纤维素纳米纤维集合体的附着部15的中间片40的截面照片。该中间片40是如下这样而成的:将纤维素纳米纤维分散液涂敷于正面40e侧,在使其干燥后,在穿过所形成的纤维素纳米纤维集合体的附着部15的位置处沿厚度方向切断。纤维素纳米纤维集合体到达中间片40内部,并覆盖中间片40的内部纤维。基于纤维素纳米纤维集合体而成的覆盖部分是在图15中位于由虚线包围的范围15G内、且纤维成为黑色的部位。图16是在由无纺布构成的中间片40的表面设有纤维素纳米纤维集合体的附着部15的样品的照片。纤维素纳米纤维集合体的附着部15在该图中沿上下配置,且将中间片40的表面上的纤维相互交联。如果具有这样的交联部,则能够在不损害透过性的情况下进一步提高扩散性。
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关于纤维素纳米纤维集合体的附着部15,也可以是:不仅在中间片40上,还遍及整面地介于不透液性树脂膜11与外装无纺布12之间,另外,也可以在隔开间隔的多个部位处介于它们之间。不透液性树脂膜11和外装无纺布12是被吸收体56吸收的排泄液的湿气朝向外部通过的通道。由于纤维素纳米纤维集合体的附着部15具有透湿性,因此,通过使纤维素纳米纤维集合体的附着部15介于不透液性树脂膜11与外装无纺布12之间,由此,制品在透湿性上变得优异,是优选的。另外,纤维素纳米纤维具有多个-OH基,且具有高吸湿性。由于纤维素纳米纤维的高吸湿性,因此与构成制品背面的外装无纺布或内衣相比,湿气更多被保持于纤维素纳米纤维集合体的附着部,因此,难以出现制品背面或内衣潮湿的触感。
另一方面,从吸湿量的观点出发,优选的是,更广地且连续地设置纤维素纳米纤维集合体的附着部15。
这种情况下,若外装无纺布12是拒水性无纺布,则基于纤维素纳米纤维集合体的附着部15的吸湿性变得更高,因此是优选的。拒水性无纺布能够通过如下方式制造:利用公知的方法在无纺布中添加(既可以是内添也可以是外添)拒水剂。作为拒水剂,可以使用硅酮系、石蜡系、烷基氯化铬(alkyl chromic chloride)系拒水剂等。
也能够使纤维素纳米纤维集合体的附着部15形成在外装无纺布12的正面上,或者将形成有纤维素纳米纤维集合体的附着部15的无纺布或纸等的片配置于不透液性树脂膜11与外装无纺布12之间,但优选形成在不透液性树脂膜11的背面上。特别是,与不透液性树脂膜11不具有吸湿性相对应地,外装无纺布12容易出现潮湿的触感,但若在不透液性树脂膜11的背面上设置纤维素纳米纤维集合体的附着部15,则外装无纺布12难以出现潮湿的触感。另外,若使纤维素纳米纤维集合体的附着部15形成于由透湿性树脂膜构成的不透液性树脂膜11上,则纤维素纳米纤维集合体的附着部15成为膜状,因此还存在如下优点:不透液性树脂膜11的阻水性和强度得到提高,且延展性降低。特别是,在由透湿性树脂膜构成的不透液性树脂膜11上,除了实施由在前后方向LD和宽度方向WD上规则地反复的文字(尺寸、商标名称、制造商名称、图案名字等)或图案等多个构成单位构成的连续装饰印刷之外,有时还实施如产品标志、人物画、照片等那样仅配置于制品的前后任意一方或双方的间断装饰印刷,但是,在进行这样的装饰印刷的情况下,希望不透液性树脂膜11的延展性较小。
<效果确认试验>
按照表1所示的各种规格,制造出图1~图7所示的结构的带型一次性尿布,并进行了下述的吸收速度试验、回流量试验和厚度测量。表中和下面未示出的规格在所有例子中都通用。
按照图14的(c)和图13的(a)所示的涂敷图案将纤维素纳米纤维集合体的附着部设置于中间片的正面。将中间片正面的面积中的纤维素纳米纤维分散液的涂敷量设为3.57g/m2。并且,关于在涂敷中使用的纤维素纳米纤维分散液的浓度,以水为溶剂设为2%(质量/容量)。
(吸收速度试验)
如以下这样进行了吸收速度试验。
(1)将样品展开,以顶片向上的方式粘贴并固定于水平设置的平板上。
(2)将载置有2kg砝码的注入筒设置于样品的宽度方向中点且前后方向中点的位置处。求取至50g人工尿被从注入筒完全吸收为止的吸收时间(秒),作为吸收速度。将这作为第1次的吸收速度。放置30分钟后,再次注入50g人工尿,并求取至完全被吸收为止的吸收速度。将这作为第2次的吸收速度。放置30分钟后,再次注入50g人工尿,并求取至完全被吸收为止的吸收速度。将这作为第3次的吸收速度。并且,通过作业员的目视观察来判断是否完全被吸收。
(回流量试验)
(1)依次实施上述吸收速度试验中的(1)和(2),从第3次的人工尿被完全吸收的时刻起经过20分钟后,在注入有人工尿的部位设置5kg砝码,并放置10分钟。
(2)在上述(1)之后,将20张滤纸重叠放置于注入有人工尿的部位,并在其上载置5kg砝码(滤纸接触面的面积为100cm2),放置20秒钟。
(3)测量上述(2)的试验操作前后的滤纸的重量,将从试验后的滤纸重量减去试验前的滤纸重量所得到的重量作为回流量。
(厚度测量)
(1)将作为测量对象的中间片设置于KATO TECH株式会社的自动化压缩试验机“KES-G5”的计测位置。然后,将利用2cm2的圆形加压板对中间片施加0.196N/cm2的压力时的测量值作为厚度(mm)。
[表1]
Figure BDA0002929412170000201
在表1中示出了吸收速度试验和回流量试验。另外,在该表中示出了中间片的厚度。在检体编号2、3、5、7、8中,得到了如下试验结果:与未设置纤维素纳米纤维集合体的附着部的情况相比,设有纤维素纳米纤维集合体的附着部的情况下的吸收速度更快。
在检体编号4、6中,未得到如下试验结果:与未设置纤维素纳米纤维集合体的附着部的情况相比,设有纤维素纳米纤维集合体的附着部的情况下的吸收速度更快。检体编号4、6的中间片的厚度比0.30mm薄。
<对说明书中的用语的说明>
在说明书中使用以下用语的情况下,只要在说明书中无特别地记载,则具有如下含义。
·“前后(纵)方向”是指连结腹侧(前侧)和背侧(后侧)的方向,“宽度方向”是指与前后方向垂直的方向(左右方向)。
·“正面侧”是指接近穿着者的肌肤的一侧,“背面侧”是指远离穿着者的肌肤的一侧。“正面”是指部件的接近穿着者的肌肤的面,“背面”是指远离穿着者的肌肤的面。
·“LD方向”和“WD方向”是指制造设备中的传送方向(LD方向)和与该传送方向垂直的横向(WD方向),它们中的任意一方成为产品的前后方向,另一方成为产品的宽度方向。无纺布的LD方向是无纺布的纤维取向的方向。纤维取向是无纺布的纤维所沿着的方向,可以通过例如如下测量方法来判别:根据纤维取向性试验法的测量方法,其中,该纤维取向性试验法是基于TAPPI标准法T481的零距离拉伸强度的试验法;或者,根据前后方向和宽度方向的拉伸强度之比来决定纤维取向方向的简易的测量方法。
·“展开状态”是指没有收缩和松弛地平坦展开的状态。
·“伸长率”是指设自然长度为100%时的值。
·“凝胶强度”如下述这样测量。在49.0g的人工尿(尿素:2wt%、氯化钠:0.8wt%、二水氯化钙:0.03wt%、七水硫酸镁:0.08wt%以及离子交换水:97.09wt%)中添加1.0g的高吸收性聚合物,并利用搅拌机搅拌。将生成的凝胶在40℃×60%RH的恒温恒湿槽内放置3个小时后恢复到常温,利用凝乳计(I.techno Engineering公司制造:Curdmeter-MAX ME-500)测量凝胶强度。
·“单位面积重量”如下述这样测定。将样品或者试验片预备烘干后放置到标准状态(试验场所的温度为23±1℃,相对湿度为50±2%)的试验室或者装置内,使之为变成恒量的状态。预备烘干是指使试样或者试验片在温度为100℃的环境中成为恒量。另外,对于公定回潮率为0.0%的纤维,也可以不进行预备烘干。使用试样选取用的模板(100mm×100mm),从变成恒量的状态下的试验片切取100mm×100mm的尺寸的试样。测量样品的重量,100倍地计算出每平米的重量作为单位面积重量。
·“吸水量”是根据JIS K7223-1996“高吸水性树脂的吸水量试验方法”来测量的。
·“厚度”是使用自动厚度测量仪(KES-G5便携式压缩试验机)在负荷为0.196N/cm2、加压面积为2cm2的条件下自动测量的。
·在没有对试验或测量中的环境条件进行记载的情况下,该试验或测量是在标准状态(在试验场所中,温度为23±1℃,相对湿度为50±2%)的试验室或者装置内进行的。
·各部分的尺寸只要没有特别记载,则是指展开状态下而不是自然长度状态下的尺寸。
以上,将由发明人完成的发明作为一个实施方式进行了说明。可是,本发明不应该被表示本实施方式的记述和附图限制。本领域技术人员基于本实施方式所执行的其它实施例等包含于本发明中。
产业上的可利用性
本发明除了能够应用于上述例子那样的带型一次性尿布外,还能够应用于短裤型一次性尿布或垫型一次性尿布等所有的一次性尿布,另外,当然也能够应用于卫生巾等其它吸收性物品。
标号说明
11:不透液性树脂膜;12:外装无纺布;13:连结带;13A:连结部;13B:带主体部;13C:带安装部;15:纤维素纳米纤维集合体的附着部;20:靶片;21:端缘部;30:顶片;40:中间片;50:吸收构件;56:吸收体;56W:吸收体宽度;58:包装片;60:立起褶裥部;62:褶裥片;B:背侧部分;F:腹侧部分;WD:宽度方向;LD:前后方向。

Claims (6)

1.一种吸收性物品,其具备:
透液性的顶片,其包含位于正面的部分;
含有高吸收性聚合物的吸收体,其设置于所述顶片的背面侧;以及
透液性的中间片,其设置于所述顶片与所述吸收体之间,
所述顶片、中间片以及吸收体至少遍及裆间部或其附近的第1位置和与该第1位置分离的第2位置进行设置,
其特征在于,
所述中间片具有至少遍及所述第1位置和所述第2位置连续的纤维素纳米纤维集合体的附着部。
2.根据权利要求1所述的吸收性物品,其中,
所述中间片是无纺布,所述纤维素纳米纤维集合体的附着部具有:无纺布的纤维表面被所述纤维素纳米纤维集合体覆盖而成的覆盖纤维;和覆盖纤维的间隙。
3.根据权利要求2所述的吸收性物品,其中,
所述中间片在所述吸收体侧的面上和内部含有所述纤维素纳米纤维集合体,
所述中间片中的所述纤维素纳米纤维集合体的含量随着从所述中间片中的所述吸收体侧朝向所述顶片侧而变少。
4.根据权利要求2或3所述的吸收性物品,其中,
所述纤维素纳米纤维集合体的附着部具有纤维素纳米纤维集合体将所述中间片的纤维相互交联而成的交联部。
5.根据权利要求1~4中的任意一项所述的吸收性物品,其中,
所述中间片是厚度为0.3mm~1.0mm、构成纤维的纤度为2dtex~10dtex、单位面积重量为20g/m2~50g/m2的短纤维无纺布,
所述纤维素纳米纤维集合体的附着部含有2g/m2~5g/m2的纤维素纳米纤维。
6.根据权利要求1~5中的任意一项所述的吸收性物品,其中,
呈细长状连续的所述纤维素纳米纤维集合体的附着部遍及所述中间片的面积的50%以上的范围隔开间隔地配置,
纤维素纳米纤维集合体的附着部的面积占所述中间片的面积的面积率为10%~30%。
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