CN109152679A - 吸收性物品 - Google Patents

吸收性物品 Download PDF

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CN109152679A
CN109152679A CN201780031249.0A CN201780031249A CN109152679A CN 109152679 A CN109152679 A CN 109152679A CN 201780031249 A CN201780031249 A CN 201780031249A CN 109152679 A CN109152679 A CN 109152679A
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woven fabrics
body fluid
liquid permeability
surface patch
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CN109152679B (zh
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铃木阳子
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Daio Paper Corp
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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
    • A61F13/00Bandages or dressings; Absorbent pads
    • 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
    • A61F13/534Absorbent 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
    • A61F13/537Absorbent 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
    • 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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    • A61F13/5125Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations the apertures being formed on a multilayer top sheet the apertures not being formed through the complete thickness of the topsheet, e.g. blind holes
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    • 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
    • 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F13/00Bandages or dressings; Absorbent pads
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    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F13/00Bandages or dressings; Absorbent pads
    • 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
    • A61F13/45Absorbent 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 shape
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  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
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  • Absorbent Articles And Supports Therefor (AREA)
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Abstract

本发明提供吸收性物品。透液性表面片(3)由上层无纺布(20)和下层无纺布(21)构成,上述上层无纺布(20)配置在肌肤侧并且具有亲水性,上述下层无纺布(21)配置在非肌肤侧并且具有防水性,透液性表面片(3)形成有贯通上述上层无纺布和下层无纺布的多个开孔(22)。能够顺畅地通过上述开孔向吸收体转移体液。肌肤侧的上层无纺布具有容易浸透体液的亲水性,非肌肤侧的下层无纺布具有难以再次吸收暂时通过的体液的防水性,因此能够减少体液的倒流量。

Description

吸收性物品
技术领域
本发明主要涉及生理用卫生巾、分泌物护垫、失禁垫、化妆用具等所使用的吸收性物品,详细而言,涉及具备双重构造的由开孔无纺布构成的透液性表面片的吸收性物品。
背景技术
以往,作为卫生护垫、生理用卫生巾、失禁垫等吸收性物品,公知有如下吸收性物品,在聚乙烯片或者聚乙烯片层压无纺布等不透液性背面片与无纺布或者透液性塑料片等透液性表面片之间,夹设有由棉状纸浆等构成的吸收体。
特别是,在就寝时间段佩戴的所谓夜用吸收性物品中,要求上述透液性表面片具有使血液、尿等体液迅速转移至吸收体的吸收速度性能、不使暂时吸收至吸收体的体液倒流的防止体液倒流性、和因为与肌肤直接接触所以具有平滑的肌肤触感等各种特性。
作为吸收性物品的表面材料,主要使用由无纺布构成的透液性无纺布和多孔性塑料片,但难以兼得体液的透过性良好、暂时吸收的体液不会倒流。
作为着眼于这种吸收性能和防止倒流性的现有技术,在下述专利文献1中,公开了一种表面片,具有贯通由防水层和亲水层构成的无纺布并且将防水层表面作为肌肤抵接面的开孔,在上述表面片中,以开孔内周面由形成防水层的纤维覆盖的方式在开孔周围的防水层和亲水层延伸并且比亲水层的吸收体侧表面更向吸收体侧突出。
另外,在下述专利文献2中,公开了一种表面片,表面片由亲水性第一纤维无纺布和亲水性第二纤维无纺布形成,上述第二纤维无纺布具有比上述第一纤维无纺布高的密度和比上述第一纤维无纺布强的亲水性,位于该第一纤维无纺布的下方,上述第一和第二纤维无纺布的对置面经由热熔胶粘合剂间歇接合,在上述开孔的周壁及其附近,上述第一和第二纤维无纺布成为一体,上述表面片的密度从其上表面朝向下表面变高,并且在该表面片的下表面及其附近,高于上述第二纤维无纺布的密度。
专利文献1:日本专利第4792249号公报
专利文献2:日本专利第3587677号公报
然而,在上述专利文献1记载的发明中,由于将表面片的肌肤抵接面作为防水层,所以在就寝时的仰卧睡、侧身睡时,体液有可能在表面片的表面传递而引起后漏、侧漏。另外,由于将表面片的非肌肤抵接面作为亲水层,所以担忧在该亲水层容易保持体液,体液难以转移至吸收体,并且倒流量增多。另外,在上述专利文献2记载的发明中,由于表面片的第一层、第二层均具有亲水性,所以有可能在表面片内容易保持体液,体液难以转移至吸收体,并且倒流量增多。
发明内容
因此,本发明的主要课题在于提供一种吸收性物品,能够顺畅地向吸收体转移体液并且能够减少倒流量。
为了解决上述课题,作为技术方案1的本发明,提供一种吸收性物品,在透液性表面片与不透液性背面片之间夹设有吸收体,上述吸收性物品的特征在于,上述透液性表面片由上层无纺布和下层无纺布构成,上述上层无纺布配置在肌肤侧并且具有亲水性,上述下层无纺布配置在非肌肤侧并且具有防水性,上述透液性表面片形成有将上述上层无纺布和下层无纺布贯通的多个开孔。
在上述技术方案1记载的发明中,由于在上述透液性表面片形成有多个开孔,所以能够顺畅地通过该开孔向吸收体转移体液。另外,配置在肌肤侧的上层无纺布具有容易吸收体液的亲水性,配置在非肌肤侧的下层无纺布具有难以再次吸收暂时通过的体液的防水性,所以体液的倒流量能够减少。
作为技术方案2的本发明,提供技术方案1记载的吸收性物品,其中,上述下层无纺布的纤度设定为低于上述上层无纺布的纤度。
在上述技术方案2记载的发明中,通过在佩戴者的肌肤侧的层使用纤维直径较大的纤维,并且在吸收体侧的层使用纤维直径较小的纤维,从而毛管力产生梯度,提高了体液的导入性。
作为技术方案3的本发明,提供技术方案1、2中的任一项所述的吸收性物品,其中,上述开孔的开孔率为10~25%。
在上述技术方案3记载的发明中,使开孔的开孔率为10~25%。如果开孔率低于10%,通过开孔向吸收体侧转移的体液的量减少,容易在表面剩余体液,如果开孔率大于25%,暂时吸收的体液容易通过开孔倒流。
作为技术方案4的本发明,提供技术方案1~3中的任一项所述的吸收性物品,上述开孔的大小为0.3~4.0mm。
在上述技术方案4记载的发明中,通过以规定的大小形成上述开孔,消除表面的剩余体液,并且体液难以倒流。
作为技术方案5的本发明,提供技术方案1~4中的任一项所述的吸收性物品,其中,与上述透液性表面片的非肌肤侧邻接地配设有亲水性的第二片,上述第二片的纤度设定为高于上述透液性表面片的纤度。
在上述技术方案5记载的发明中,通过使上述第二片的纤度高于透液性表面片的纤度,能够顺畅地将透液性表面片的体液向吸收体转移。
如以上详细所述,根据本发明,能够顺畅地向吸收体转移体液,并且能够减少倒流量。
附图说明
图1是本发明所涉及的生理用卫生巾1的局部剖切展开图。
图2是图1的II-II线向视图。
图3是图1的III-III线向视图。
图4是透液性表面片3的放大俯视图。
图5是透液性表面片3的放大剖视图(图4的V-V线向视图)。
具体实施方式
以下,参照附图详述本发明的实施方式。
〔生理用卫生巾1的基本构造〕
如图1和图2所示,本发明的生理用卫生巾1具备:由聚乙烯片等构成的不透液性背面片2;使经血、分泌物等(以下也统称为体液)迅速透过的透液性表面片3;夹装于上述两片2、3间的由棉状纸浆或者合成纸浆等构成的吸收体4;与上述透液性表面片3的非肌肤侧邻接配置的由亲水性的无纺布等构成的第二片6;以及沿长度方向大致遍及全长地设置于肌肤抵接面侧的两侧部的侧部无纺布7,并且在上述吸收体4的周围,在其上下端缘部,上述不透液性背面片2与透液性表面片3的外缘部通过热熔胶等粘合剂、热封、超声波密封等接合手段而接合,另外在其两侧缘部,比吸收体4向侧方延伸突出的上述不透液性背面片2与上述侧部无纺布7的外缘部通过热熔胶等粘合剂、热封、超声波密封等接合手段而接合,由此形成有未夹设有吸收体的护翼部。此外,在图示例子中,为了保持上述吸收体4的形状以及提高扩散性,通过由皱纹纸或者无纺布等构成的包覆片5包围上述吸收体4,但也可以不设置该包覆片5。
以下,进一步对上述生理用卫生巾1的构造进行详述,
上述不透液性背面片2能够使用聚乙烯等至少具有隔水性的片材,但从防止闷湿的观点看,优选使用具有透湿性的材料。作为该隔水/透湿性片材,优选使用在聚乙烯、聚丙烯等烯烃系树脂中熔融混炼无机填充剂而成型薄片之后沿单轴或者双轴方向延伸从而获得的微多孔性片。在上述不透液性背面片2的非肌肤侧面(外表面),沿卫生巾长度方向形成有一条或者多条粘着剂层(未图示),在向身体佩戴时,将生理用卫生巾1固定于内衣。作为上述不透液性背面片2,也可以使用层叠有塑料薄膜与无纺布的层压无纺布。
夹设于上述不透液性背面片2与透液性表面片3之间的吸收体4例如由棉状纸浆和吸水性聚合物构成。上述吸水性聚合物在构成吸收体的纸浆中例如作为粒状粉被混入。作为上述纸浆,列举出由木材制得的化学纸浆、溶解纸浆等由纤维素纤维、人造丝、醋酸等人造纤维素纤维构成的纸浆,与阔叶树纸浆相比,在功能和价格方面,优选使用纤维长度较长的针叶树纸浆。上述吸收体4的单位面积重量可以为250~650g/m2,优选为300~400g/m2
另外,也可以在上述吸收体4中混合合成纤维。上述合成纤维例如能够使用聚乙烯或者聚丙烯等聚烯烃系、聚对苯二甲酸乙酯、聚对苯二甲酸等聚酯系、尼龙等聚酰胺系以及它们的共聚物等,也可以混合有上述两种。另外,也能使用将熔点高的纤维作为芯且将熔点低的纤维作为鞘的芯鞘型纤维、并列型纤维、分割型纤维等复合纤维。在上述合成纤维为疏水性纤维的情况下,上述合成纤维优选使用通过亲水化剂进行了表面处理后的纤维使得具有对体液的亲和性。
如图1和图2所示,优选在上述吸收体4的包含与体液排出部H对应的部位在内的区域设置有在肌肤侧增厚的吸收体的中高部8。上述中高部8与吸收体4的肌肤侧面邻接,并且配置在吸收体4的宽度方向中央部,上述中高部8形成为宽度尺寸和长度尺寸比吸收体4小。对于上述中高部8的厚度而言,如果太厚,则刚性提高,向身体的紧贴性降低,如果太薄,则与佩戴者的体液排出部H的紧贴性降低,因此可以为3~25mm,优选为5~18mm。在上述中高部8的配设区域中的上述吸收体4和中高部8的合计单位面积重量可以为400~900g/m2,优选为600~800g/m2
上述中高部8配置在至少包含与佩戴者的体液排出部H对应的部位在内的区域。该中高部8可以如图示例子那样形成为从包含与体液排出部H对应的部位在内的区域至包含与臀部槽对应的部位在内的区域连续的细长形状,也可以仅配置在包含与体液排出部H对应的部位在内的区域,由此不配置在包含与后侧的臀部槽对应的部位在内的区域。
在图示例子中,如图2和图3的横剖视图所示,上述透液性表面片3的宽度尺寸比吸收体4的宽度稍长,并限于仅覆盖吸收体4,由此外侧配设有与上述透液性表面片3不同的侧部无纺布7,具体而言,根据防止经血、分泌物等浸透或者提高肌肤触感等目的,配设有使用实施了适当的防水处理或者亲水处理的无纺布原材料而构成的侧部无纺布7。作为该侧部无纺布7,能够使用将天然纤维、合成纤维或者再生纤维等作为原材料通过适当的加工方法而形成的无纺布,但为了消除僵硬感并且防止闷湿,优选使用抑制基重且具有通气性的无纺布。具体而言,优选使用使基重为13~23g/m2而制成的无纺布,并且为了可靠地防止体液透过,优选使用涂有硅系、石蜡系、烷基氯化铬系防水剂等的防水处理无纺布。
如图2和图3所示,上述侧部无纺布7遍及从规定的内侧位置至不透液性背面片2的外缘为止的范围,通过热熔胶等粘合剂粘合比宽度方向中间部靠外侧的外侧部分,通过这些上述侧部无纺布7与不透液性背面片2的层叠片部分,在吸收体4的两侧部形成有未夹设有吸收体4的护翼部。通过该护翼部,能够在大致与体液排出部H相当的吸收体侧部位置,形成左右一对翼状护翼W、W,并且由此在臀部侧(后部侧)位置,形成臀部保持用护翼WB、WB。在上述翼状护翼W、W和臀部保持用护翼WB、WB的外表面侧,分别具备粘着剂层(未图示),在向内裤佩戴时,能够在基端部的折线RL位置,将上述翼状护翼W、W向相反侧折回,卷绕固定于内裤的裆部,并且将上述臀部保持用护翼WB固定于内裤的内表面。
另一方面,上述侧部无纺布7的内侧部分大致双重折回,并且在该双重片内部,在其高度方向中间部,配设有两端或者长度方向的适当位置被固定的线状弹性伸缩部件9、9…,该线状弹性伸缩部件9、9…为一根或者多根,在图示例子中,为三根,该线状弹性伸缩部件9、9…以两端或者长度方向的适当位置被固定的状态配设。该双重片部分在前后端部如图3所示那样向外侧折回一次而以层叠的状态粘合至吸收体4侧,由此如图2所示那样左右成对地形成向外侧倾斜并且向表面侧立起的直线状的立体皱裥BS、BS。
在本生理用卫生巾1中,在上述中高部8的附近外侧部位置,形成有从透液性表面片3的外表面侧朝向不透液性背面片2凹陷的压榨槽10。上述压榨槽10至少分别形成在从包含与体液排出部H对应的部位在内的区域至包含与臀部槽对应的部位在内的区域的两侧部。具体而言,在图1所示的例子中,通过前侧长度方向压榨槽11、11、后侧长度方向压榨槽12、12、前端月牙形压榨槽13以及后端弯曲形压榨槽14而构成,其中,上述前侧长度方向压榨槽11、11在从包含与体液排出部H对应的部位在内的区域至包含与臀部槽对应的部位在内的区域的两侧部,分别沿卫生巾1的大致长度方向连续形成;上述后侧长度方向压榨槽12、12分离配置在该前侧长度方向压榨槽11的后侧,并且在与臀部槽的后端部分对应的部位的两侧部,分别沿卫生巾1的大致长度方向连续形成;上述前端月牙形压榨槽13分离配置在上述前侧长度方向压榨槽11、11的前侧,并且在宽度方向横穿卫生巾1的长度方向中心线,由沿卫生巾1的大致宽度方向形成的月牙形状构成;上述后端弯曲形压榨槽14分离配置在上述后侧长度方向压榨槽12、12的后侧,并且在宽度方向横穿卫生巾1的长度方向中心线,由朝向后方膨出的弯曲形状构成。上述压榨槽10通过从透液性表面片3的外表面侧的热压花,从透液性表面片3至吸收体4一体压榨而成。
〔透液性表面片3〕
接下来,详细说明上述透液性表面片3。详细而言,如图4和图5所示,上述透液性表面片3为由上层无纺布20与下层无纺布21构成的双重构造,上述上层无纺布20配置在肌肤侧并且具有亲水性,上述下层无纺布21配置在非肌肤侧并且具有防水性,上述透液性表面片3形成有贯通上述上层无纺布20和下层无纺布21的多个开孔22、22…。作为构成无纺布的原材料纤维,除聚乙烯或者聚丙烯等烯烃系、聚酯系、聚酰胺系等合成纤维之外,还能够为人造丝、铜铵丝(cupro)等再生纤维、棉等天然纤维,能够使用通过气流法(Air-through)、水刺法(Spunlace)、纺粘法(Spunbond)、热粘合法(Thermal bond)、熔喷法(Meltblown)、针刺法(Needle Punch)等适宜的加工方法得到的无纺布。在这些加工方法中,由于通过气流法制成的无纺布,纤维间的空间较大,具有蓬松的触感,体积大、粗松,所以佩戴感良好,体液容易在纤维间通过而浸透,因此优选。无纺布的纤维也可以是长纤维或者短纤维中的任一种,但为了生成毛巾料的质地,优选使用短纤维。另外,为了容易进行压花处理,可以使用熔点比较低的聚乙烯或者聚丙烯等烯烃系纤维。另外,也能适当地使用将熔点高的纤维作为芯且将熔点低的纤维作为鞘的芯鞘型纤维、并列型纤维、分割型纤维的复合纤维。
作为上述上层无纺布20,使用通过使用人造丝、铜铵丝(cupro)等再生纤维、棉等天然纤维从而原材料本身具有亲水性的纤维,或者使用通过亲水剂对聚乙烯或者聚丙烯等烯烃系、聚酯系、聚酰胺系等合成纤维进行表面处理而赋予了亲水性的纤维,由此具有亲水性。作为亲水剂,例举阴离子表面活性剂、羧酸盐、酰化水解蛋白、磺酸盐、硫酸酯盐、磷酸酯盐、非离子表面活性剂、聚氧乙烯表面活性剂、羧酸酯、羧酸酰胺、聚环氧烷嵌段共聚物、阳离子表面活性剂、季铵盐、两性表面活性剂、咪唑啉衍生物等,除此之外,作为涂覆于纤维的亲水剂,只要是公知的亲水剂即可,均可应用。上述亲水剂的涂覆可以仅在上层无纺布20的肌肤侧面实施,也可以在肌肤侧面与非肌肤侧面这两面实施。通过至少在肌肤侧面实施亲水处理,上层无纺布20的至少肌肤侧面具有亲水性,体液容易被导入透液性表面片3。
作为上述下层无纺布21,优选使用通过使用聚乙烯或者聚丙烯等烯烃系、聚酯系、聚酰胺系等合成纤维从而原材料本身具有防水性的纤维,但在使用棉纤维等亲水性纤维的无纺布时,外部涂覆防水剂来使用。作为防水剂,在石蜡系、硅系等已知的防水剂中,能够适当地选择对肌肤的刺激性少的防水剂来使用,但更加优选适当地选择硬脂酸酰胺、硬脂酸锌、硬脂酸钙、硬脂酸二乙醇酰胺、硬脂酸镁等刺激性少的油脂来使用,除此之外,作为涂覆于纤维的防水剂,只要是公知的防水剂即可,均可应用。上述防水剂的涂覆可以仅在下层无纺布21的非肌肤侧面实施,也可以在非肌肤侧面与肌肤侧面这两面实施。通过至少在非肌肤侧面实施防水处理,下层无纺布21的至少非肌肤侧面具有防水性,由此能够防止暂时吸收至吸收体侧的体液向透液性表面片3倒流。
如图5所示,贯通上述上层无纺布20和下层无纺布21的多个开孔22、22…通过在层叠有上述上层无纺布20和下层无纺布21的状态下实施开孔处理,从而一体地贯通上述上层无纺布20和下层无纺布21来形成。即,上述开孔22从上层无纺布20的肌肤侧面至下层无纺布21的非肌肤侧面连续贯通。因此,体液能够通过上述开孔22从透液性表面片3的肌肤侧向非肌肤侧通过,能够顺畅地向吸收体4侧转移体液。针对上述开孔处理,能够采用扎入加热针的方法、使透液性表面片3软化至软化温度附近并在使之位于具有多个开孔的支承体的上表面的状态下从支承体的下方进行吸引或者从支承体的上表面以气压进行加压而形成开孔的方法等。
在由以上结构构成的生理用卫生巾1中,在上述透液性表面片3形成有多个开孔22、22…,因此能够顺畅地通过该开孔22…向吸收体4转移体液。另外,由于配置在肌肤侧的上层无纺布20具有容易吸收体液的亲水性,配置在非肌肤侧的下层无纺布21具有难以再次吸收暂时通过的体液的防水性,所以暂时吸收至吸收体4侧的体液被防水性的下层无纺布21阻挡,能够减少倒流至透液性表面片3的肌肤侧的情况。
为了容易从上述透液性表面片3向吸收体侧转移体液,优选下层无纺布21的纤度设定为低于上层无纺布20的纤维的纤度。由此,由于纤度较低的下层无纺布21通过毛细管现象导入体液的导入力变大,所以毛管力产生梯度,能够提高体液的导入性。具体而言,优选上述上层无纺布20的纤度为2.0~6.0dtex,优选上述下层无纺布21的纤度为1.0~5.0dtex。为了确实产生毛管力梯度,上述上层无纺布20的纤度与下层无纺布21的纤度之差为1.0~5.0dtex,优选为2.5~5.0dtex。
上述上层无纺布20与下层无纺布21的比例(重量比)可以为,上层无纺布20:下层无纺布21为2:8~8:2,优选为4:6~6:4,更加优选为5:5。通过使上层无纺布20与下层无纺布21为大致相同的比例,能够更可靠地实现体液的吸收与防止倒流。
优选上述下层无纺布21具有防水性的范围为下层无纺布21的整个面,但是,例如在包含与佩戴者的体液排出部H对应的部位在内的范围,吸水量较多,容易产生倒流,因此也可以使包含上述中高部8在内的宽度方向中央部具有防水性而使其两侧部具有亲水性等局部赋予防水性。
上述开孔22…的开孔率可以为10~25%。所谓上述开孔率,是指在透液性表面片3的单位面积中所占据的开孔22部分的面积的比例。如果开孔率低于10%,通过开孔22向吸收体4侧转移的体液的量减少,在表面容易剩余体液。另外,如果开孔率大于25%,暂时吸收至吸收体4侧的体液容易通过开孔22倒流。
多个开孔22…可以遍及透液性表面片3的整个面形成,也可以仅形成在包含与体液排出部对应的部位在内的区域,还可以在其他区域不形成开孔。另外,上述开孔22…可以以图4所示的交错形状、正网格状等具有规则性的图案来配置,还可以以不具有这种规则性的随机图案来配置。
如图4所示,上述开孔22的平面形状可以为沿卫生巾长度方向较长的椭圆形,虽未图示,但也可以为沿卫生巾宽度方向较长的椭圆形、圆形、长圆形、方形等。
此时,上述开孔22的大小D可以为0.3~4.0mm,优选为0.5~2.8mm。这里,如图4所示,开孔22的大小D是指开孔22的平面方向的最大尺寸。在开孔22的大小不足0.3mm时,体液难以通过开孔22,如果超过4.0mm,体液容易产生倒流。
〔第二片6〕
接下来,说明与上述透液性表面片3的非肌肤侧邻接配置的亲水性的第二片6。上述第二片6对体液具有亲水性即可。具体而言,能够使用通过使用人造丝、铜铵丝(cupro)等再生纤维、棉等天然纤维从而原材料本身具有亲水性的纤维,或者使用通过亲水化剂对聚乙烯或者聚丙烯等烯烃系、聚酯系、聚酰胺系等合成纤维进行表面处理而赋予了亲水性的纤维。
上述第二片6配置在透液性表面片3与吸收体4之间。该第二片6至少配置在覆盖吸收体4的范围即可,但优选设置于与透液性表面片3大致相同的范围。优选上述第二片6通过热熔或者热熔敷(压花)与透液性表面片3不连续地接合。
优选上述第二片6的纤度设定为高于透液性表面片3的纤度。假如上述第二片6的纤度与透液性表面片3大致相同或者较低,此时,上述第二片6与下层无纺布21的纤度之差变小,难以从透液性表面片3向第二片6转移体液。与此相对,通过使第二片6的纤度高于透液性表面片3的纤度,能够顺畅地向吸收体4转移体液。优选上述第二片6的纤度为2.0~6.0dtex。
作为上述第二片6,可以使用无孔的无纺布,也可以使用以规定的图案形成有开孔的无纺布。在形成有开孔时,在第二片6形成的开孔和在透液性表面片3形成的开孔22可以完全不一致,也可以为一部分或者全部一致的配置图案。
实施例
使用上述上层无纺布20具有亲水性而下层无纺布21具有防水性的本生理用卫生巾1、和上层无纺布与下层无纺布均具有亲水性的现有的生理用卫生巾,进行了倒流量的比较试验。在倒流量的试验中,将37℃的人工经血3cc以三分钟间隔注入了5次时,在第五次注入人工经血的一分钟之后,放置预先测定出重量的滤纸,装载5g/cm2负载的重物五分钟,在装载后,再次测定滤纸重量,根据装载前后的重量差计算出倒流量(g)。
此外,对于上述人工经血,在1升的成分中,使用了甘油100ml、CMC(羧甲基纤维素钠)4.6g、纯净水875ml、氯化钠10g、碳酸钠10.7g。另外,上层无纺布和下层无纺布的单位面积重量均为11g/m2,开孔的大小在长度方向为1.2~1.4mm,在宽度方向为0.9~1.0mm,开孔率为18%~20%,纤维结构为PE/PET。
[表1]
分别比较比较例1和实施例1、比较例2和实施例2,均是下层无纺布具有防水性的一方倒流量减少。即,能够证实通过透液性表面片3的上层以容易吸收体液的方式具有亲水性、下层以暂时吸收到的体液不会倒流的方式具有防水性,能够使倒流量减少。
附图标记说明:
1…生理用卫生巾;2…不透液性背面片;3…透液性表面片;4…吸收体;5…包覆片;6…第二片;7…侧部无纺布;8…中高部;9…线状弹性伸缩部件;10…压榨槽;11…前侧长度方向压榨槽;12…后侧长度方向压榨槽;13…前端月牙形压榨槽;14…后端弯曲形压榨槽;20…上层无纺布;21…下层无纺布;22…开孔。

Claims (5)

1.一种吸收性物品,在透液性表面片与不透液性背面片之间夹设有吸收体,
所述吸收性物品的特征在于,
所述透液性表面片由上层无纺布和下层无纺布构成,所述上层无纺布配置在肌肤侧并且具有亲水性,所述下层无纺布配置在非肌肤侧并且具有防水性,所述透液性表面片形成有将所述上层无纺布和下层无纺布贯通的多个开孔。
2.根据权利要求1所述的吸收性物品,其中,
所述下层无纺布的纤度设定为低于所述上层无纺布的纤度。
3.根据权利要求1或2所述的吸收性物品,其中,
所述开孔的开孔率为10~25%。
4.根据权利要求1~3中的任一项所述的吸收性物品,其中,
所述开孔的大小为0.3~4.0mm。
5.根据权利要求1~4中的任一项所述的吸收性物品,其中,
与所述透液性表面片的非肌肤侧邻接地配设有亲水性的第二片,
所述第二片的纤度设定为高于所述透液性表面片的纤度。
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