CN1168426C - 弹性复合片及其制造方法 - Google Patents

弹性复合片及其制造方法 Download PDF

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CN1168426C
CN1168426C CNB011196963A CN01119696A CN1168426C CN 1168426 C CN1168426 C CN 1168426C CN B011196963 A CNB011196963 A CN B011196963A CN 01119696 A CN01119696 A CN 01119696A CN 1168426 C CN1168426 C CN 1168426C
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高井尚志
铃木未央
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Abstract

本发明提供表面柔软的弹性复合片，该弹性复合片(1)由纤维集合体(2)和接合在其上面的多个薄膜的微细片(3)构成。微细片(3)间断地排列，在微细片(3)之间纤维集合体(2)露出，在微细片(3)的各个边上形成立起部(12)。

Description

弹性复合片及其制造方法
技术领域
本发明涉及适合作为尿布和生理用卫生巾等一次性体液吸收穿用物品的表面材料使用的弹性复合片。
背景技术
特开平11-217453号公报中公开了由弹性塑料片层和接合在其下表面上的纤维层构成的弹性复合片。在该复合片的塑料片层上存在多条由朝一方向间断排列的多个开孔的开孔列。开孔列与开孔列之间是平坦的塑料片部分，在该塑料片部分上，在形成开孔的周缘的部位中，在朝向上述一方向延伸的部位上形成呈锯齿状朝向上述塑料片的上表面上方立起的若干立起部。
在上述公知的复合片上，在皮肤与该表面接触时，多数的立起部可以弹性变形并产生羽绒那样的柔软接触感。可是，在该复合片中，因为大部分立起部朝向与开孔列的延伸的方向相同方向形成排列成象锯齿那样的列，虽然与皮肤接触后的立起部沿与开孔列垂直方向倒伏的状态可产生柔软感，但为沿开孔的延长方向不容易倒伏，所以在后者方向上的柔软度不及在前者方向上的柔软度。并且这两方向上的柔软度在该复合片作为穿用品的表面材料使用的场合下即使是足够大，由于柔软度随着复合片的方向的不同而不同，即就柔软度而言，在复合片上存在各向异性。一般这种各向异性对复合片的使用法的限制是不可取的。
发明内容
本发明的课题是对如上述的复合片进行改进，以便使其表面的柔软性不会产生各向异性。
本发明是通过提供新结构的弹性复合片及其制造方法来解决上述课题的。
本发明的对象是关于上述弹性复合片，该弹性片是在具有上表面和下表面的片状纤维集合体的上述上表面上，以使该上表面在多数的部位上露出的状态，间隔配置、结合由热塑性合成树脂构成的薄膜。
在这样的复合片上，本发明的特征如下：上述纤维集合体是由纤度0.5～20分特(dtex)的纤维构成的面密度为5-60g/m2的纤维集合体；上述薄膜形成许多微细片，每个微细片的厚度为1～50μm，在上述纤维集合体中的第一方向和与上述第一方向交叉的方向的第二方向空出30～1000μm的间隔间断地排列，并沿上述微细片的上述第一方向和第二方向延伸的各个棱(边)上从上述下表面上向上表面立起，从位于上述各个棱上的基端部向该立起的前端部形成宽度依次变窄的多个立起部。
关于上述弹性复合片的制造方法，本发明的特征在于：以下述工序处理在具有上表面和下表面的连续的纤网的上述上表面上接合连续的热塑性合成树脂薄膜形成的复合网：
a、向一个方向连续供给上述复合网的工序；
b、使把多个喷嘴呈直线地配置在沿与上述一方向交叉方向上的第一喷嘴群沿与上述一方向交叉的方向往复运动，并使流体从上述各个喷嘴朝向上述复合网的上述薄膜、以使流体变成柱状的方式喷射，并沿着运动的喷嘴的轨迹破碎上述薄膜的工序；
c、使把多个喷嘴呈直线地配置在与上述一方向交叉方向上的第二喷嘴群沿与上述一方向交叉的方向往复运动，使流体从上述各个喷嘴朝上述复合网的纤维网的下表面以使流体变成柱状喷射，在扩开上述薄膜的已破列部分的同时，使残留在上述部位的边缘上的上述薄膜的已破裂部分沿从上述纤维网的下表面朝向上表面的方向取向的工序。
下面参照附图详细说明与本发明有关的弹性片及其制造方法。
附图说明
图1是复合片的斜视图
图2是沿图1的II-II线剖切的剖视图
图3是复合片制造工序的局部侧面图
图4是图3的局部平面部。
具体实施方式
图1和2分别是弹性复合片的斜视图和沿其II-II线剖切的剖视图。复合片1具有由具有上表面6和下表面7的片状纤维集合体2和接合在其上表面6上的热塑性合成树脂构成的多个微细片3。
纤维集合体2是由热塑性合成纤维如化学纤维、天然纤维等纤维8组成，并具有5～200g/m2的面密度。纤维8通过互相熔接或机械的互相缠绕维持集合体2的片状形状。纤维8在其是热塑性合成纤维时，最好具有0.5～20分特的纤度。在纤维集合体2的例子中有防粘结合无纺布，气流无纺布，针刺无纺布，熔喷无纺布和纺粘网无纺布。纤维集合体2最好具有小于0.2kPa·s/m小的通气阻力率。
热塑性合成树脂的微细片3具厚度1～50μm，并相对纤维集合体2的上面沿第一方向X和与第一方向X交叉的第二方向Y间隔地排列。在第一方向X和与第二方向Y上，相邻的微细片3与微细片3的间隔在30～1000μm的范围，在微细片3彼此之间纤维集合体2的上表面6露出。复合片1作为一次性尿布和生理用卫生巾的表面材料使用时的微细片3的优选形状为图示例那样的大致四边形，并且由其周缘沿第一方向X互相并行延伸的第一、二边11、12和沿第二方向Y互相并行延伸的第三、四边13、14形成。最好各边11～14的长度处在0.1～5mm的范围，各边11～14的相交角度在20°～160°的范围内。
在微细片3的各边11～14上形成从微细片3的上面16朝向上方立起的多数立起部17。立起部17由与微细片3同样的材料组成，其厚度与微细片3相同或比其薄，并具有沿微细片3的周缘延伸的基端部分18和从其基端部分18向上方延伸的前端部分19，并从基端部分18向前端部分19其宽度顺次变窄。立起部17朝第一方向和第二方向形成列，微细片3处在其周围被立起部17包围的状态。从该立起部17的基端部分18到前端部分19的高度最好在1.5mm以下。
这样的微细片3除了通过溶着在纤维集合体2上或者通过粘接结合在纤维集合体2上之外，也可如图示例那样使相邻的微细片3之间通过桥接部分21互相连接。桥接部分21与立起部分17一样，是由与微细片3相同的材料构成，具有沿微细片3的周缘延伸的基端部分。桥接部分21的顶部向上方画弧。
该复合片1可以在一次性尿布和生理卫生巾等上作为被覆吸液芯的透液性表面材料使用，对于这种情况的复合片1而言，最好使用亲水性的材料作为纤维8，使用亲水性或疏水性的材料作为微细片3。分泌在复合片1的上表面上的体液从微细片3与3之间向纤维集合体2的下方移动，再被与集合体2的下表面7接触的吸液芯吸收。因为被吸收的体液被微细片3和立起部17隐蔽起来，所以在丢弃尿布和卫生巾时几乎不能透过而看见被体液脏污的吸液芯，为了提高复合片1的这种隐蔽性，可以在微细片3中使用包含二氧化钛和硫酸钡等的1～30重量％的热塑性合成树脂。因为通过立起部17边晃动边使光浸反射可以隐蔽体液，所以最好在各边11～14上形成多个立起部。
在皮肤与复合片1表面接触时，立起部17稍微变形可以产生象羽绒一样的柔软接触感。特别是如皮肤擦过复合片1向第一方向X方向移动时，则位于第三、四边13、14的立起部17进行倒向第一方向X的运动，产生柔软的接触感。如果皮肤向第二方向Y移动，则位于第一、二片11、12上的立起部17进行倒向第二方向Y的运动，可以产生柔软的接触感。因为复合片1相对这两方向X、Y同样是柔软的，所以没有必要考虑方向性，从而使用起来更方便。
作为透液性表面材料使用的复合片1最好选择集合体2的面密度与微细片3之间的间隔，以便使从微细片3到纤维集合体2的方向的通气阻力率小于0.5kPa·s/m。
图3和4分别是复合片1的制造工序的局部侧面图和表示其侧面图的一部分的平面图。从两图的左方连续供给通过把热塑性合成树脂薄膜103熔接或粘接在纤维网102的上表面106上结合而成的复合网101。复合网101从上方与在周面上具有许多透水开孔(未示出)的第一旋转滚筒121相接触，并受到从设置在第一旋转滚筒121上方的第一喷嘴群131的多个喷嘴130喷射出的高压柱状水流处理。第一喷嘴群131由与供给网101的供给方向交叉延伸的多列喷嘴131a、131b、131c组成，这些列都有多个喷嘴130，朝与复合网101的供给方向交叉的方向P只以所要求的尺寸重复进行往复运动。处理后的复合网101的薄膜103按照各喷嘴130的运动轨迹破裂，形成许多开孔135。具有开孔135的复合网101供给具有许多透液性开孔(未示出)的第二旋转滚筒122。在第二旋转滚筒122上，薄膜103从下方与其接触，通过从设置在第二旋转滚筒122下方的第二喷嘴群132的多个喷嘴133朝纤维网102的下面107喷射的高压柱状水流对复合网101进行处理。第二喷嘴群132也由沿与复合网101的供给方向交叉的方向延伸的多列喷嘴132a、132b、132c细成，这些列都有多个喷嘴133，并沿着与复合网101的供给方向交叉的方向P只以所要求的距离(尺寸)重复往复运动。第一、二喷嘴群131、132几乎以同样的方式构成，并朝向相同的方向P进行往复运动。在来自第二喷嘴群132的高压柱状水流的作用下，使在薄膜103上形成的开孔135的宽度扩大并使长度延长，与此同时，使在开孔135的周缘残留的薄膜103的破裂部分向薄膜103的上方取向排列。这样取向排列的部分形成图1、2的立起部17和/或桥接部分21。另外，被延长的开孔135包围的部分形成图1、2的微细片3。从第二旋转滚筒122离开后向图的右方进行的复合网101通过干燥器136后卷成卷，形成图1的复合片。
这样得到的复合片1因为与皮肤接触良好，隐蔽因吸液芯吸收体液而引起的脏污的性能优良，所以非常适合作为一次性尿布和生理卫生巾透液性表面材料使用。因为该复合片与皮肤接触的透气性能优良，所以也非常适合作为医院穿用的一次性外衣的面料使用。
在与本发明有关的弹性复合片中，因为形成其表面的热塑性合成树脂薄膜的微细片其周围有多个立起部，所以该复合片的表面即使从任何方向掠过也能显示出同样的柔软性。

Claims (8)

1、一种弹性复合片，在具有上表面和下表面的片状纤维集合体的上述上表面上，以使该上表面在多数的部位上露出的状态配置、结合有由热塑性合成树脂构成的薄膜，其特征在于：
上述纤维集合体是由纤度0.5～20dtex的纤维构成的面密度为5～60g/m2的纤维集合体；
上述薄膜由许多微细片形成，每个微细片的厚度为1～50μm，在上述纤维集合体中的第一方向和与上述第一方向交叉的方向的第二方向空出30～1000μm的间隔间断地排列，并沿上述微细片的上述第一方向和第二方向延伸的各个棱上从上述下表面上向上表面立起，从位于上述各个棱上的基端部向该立起的前端部形成宽度依次变窄的多个立起部。
2、如权利要求1所述的复合片，其特征在于：从上述复合片的上述微细片向上述纤维集合体的方向的通气阻率小于0.5kPa·s/m。
3、如权利要求1或2所述的复合片，其特征在于：从上述立起部的上述基端部分的高度小于1.5mm。
4、如权利要求1或2所述的复合片，其特征在于：在上述第一方向和第二方向中的任何一个方向上相邻的上述微细片之间由上述热塑性合成树脂组成并通过弯曲后立起的桥接部分互相连接，以便使上述微细片之间从下表面朝上表面的方向突起。
5、如权利要求1或2所述的复合片，其特征在于：上述薄膜作为形成一次性吸收物品的皮肤接触面而使用。
6、一种弹性复合片的制造方法，其特征在于：以下述工序处理在具有上表面和下表面的连续的纤网的上述上表面上结合连续的热塑性合成树脂薄膜而形成的复合网：
a、向一个方向连续供给上述复合网的工序；
b、使把多个喷嘴呈直线地配置在沿与上述一方向交叉方向上的第一喷嘴群沿与上述一方向交叉的方向往复运动，使流体从上述各个喷嘴朝向上述复合网的上述薄膜以使流体变成柱状的方式喷射、并沿着该喷嘴的运动的轨迹破碎上述薄膜的工序；
c、使把多个喷嘴呈直线地配置在与上述一方向交叉方向上的第二喷嘴群沿与上述一方向交叉的方向往复运动，使流体从上述各个喷嘴朝上述复合网的纤维网的下表面以使流体变成柱状喷射，在扩开上述薄膜的已破列部分的同时，把残留在上述部位的边缘上的上述薄膜的已破裂部分沿从上述纤维网的下表面朝向上表面的方向取向的工序。
7、如权利要求6所述的制造方法，其特征在于：上述第一、二喷嘴群分别由互相平行的多列喷嘴形成。
8、如权利要求6或7所述的制造方法，其特征在于：上述流体是水。
CNB011196963A 2000-03-31 2001-03-30 弹性复合片及其制造方法 Expired - Fee Related CN1168426C (zh)

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