CN1089574C - 制作一次性使用尿布的方法 - Google Patents

制作一次性使用尿布的方法 Download PDF

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CN1089574C
CN1089574C CN94105607A CN94105607A CN1089574C CN 1089574 C CN1089574 C CN 1089574C CN 94105607 A CN94105607 A CN 94105607A CN 94105607 A CN94105607 A CN 94105607A CN 1089574 C CN1089574 C CN 1089574C
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tergite
fusing point
wings
last slice
sheet
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CN1095581A (zh
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末兼真
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Unita Corp
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Abstract

为了获得在其各腰侧上具有柔滑手感的熔接区的一种一次性使用尿布，在此公开了一种用于制作这种尿布1的方法，它包括的步骤是：使设在尿布1的前、后身片5、6上的翼状部分21、22按使上片2面向内地一个放置在另一个上，以及在热压之下把这些翼状部分熔接一起。在各个翼状部分21、22上，一片膜片件连结在上片2和背片3中的至少一片上以形成它的一个伸出部并使该部分的背片的熔点高于上侧片件的熔点。

Description

制作一次性使用尿布的方法
本发明涉及一种制作一次性使用的尿布的方法，这种尿布腰围上横对的每一侧都经熔合。
公开号为1993-15551的日本专利申请揭示了一种紧身内裤型的一次性使用尿布的一个例子，根据这个例子，这种尿布包含有一上片、一背片和设在它们之间的一吸液芯，它沿着通过胯部区的一条横向中心线折迭起来以使前后身片一片置于另一片之上，并且沿着在其腰围上的横对的两侧边用超声波方法将上片和背片熔合一起以获得一种紧身内裤型的结构。上、背片可由，例如热塑合成树脂的无纺布来制备，两片可采用超声波处理方法熔合在一起。
如果在所述的公开专利的上、背片是用同种的无纺布在呈现适合熔合粘度的同样温度时熔融，那么在该温度下熔合的上、背片就可以获得光整的外表。然而，如果用具有相当高的熔点的聚丙烯无纺布制备的上片与具有相当低的熔点的聚乙烯制备的背片相贴合，则在尿布基片握手似地折迭起来并经超声波融合时，背片要比上片早熔融。因而，背片的聚乙烯可熔融成具有很低的粘度而粘结在已压贴在背片的电极臂上。这聚乙烯片一旦粘到电极臂上，在冷却后就会形成一个粗糙表面，这就使尿布使用者的皮肤得到痒的刺激和不舒服感，而且尿布的外表不美观。如果一小块聚乙烯片仍粘结在电极臂上，那么在下一次熔接循环时不就能保证在该电极臂与焊机的铁砧之间的精确间隙，从而造成连续熔接的困难。
因此，本发明的一个主要目的是解决所述的已有技术中所存在的问题，解决的方法是，从与上片相比具有更高熔点的一个片上准备一片尿布的翼状部分的背片。
上述的目的是根据本发明的下述方案实现，这种用于制造一次性使用尿布的方法一般包括以下步骤：把一可渗液体的上片、一不可渗液体的背片及设在这两片之间的一个吸液芯安置成一次性使用尿布的基本形状，将所述吸液芯的横向相对的二侧边向外延伸出的尿布前、后身片的翼状部分，象握手那样地一片放在另一片之上，以及在加热和加压之下把所述的翼状部分熔焊一起以形成所述前、后身片的腰围线的横侧相对部分；所述的方法还包括下面步骤：把一片与每个翼状部分里上、背片中的至少一片相连接以形成其一个延伸部分和提供翼状部分的背片，并使这个翼状部分背片的熔点要比沿着各腰侧的翼状部分的上片的熔点高，以及把这些上、背片熔接在一起。
根据上述的方法，如一个所需形状的超声波电极臂或一个所需形状的加热元件那样的热压装置用来压抵在要被熔接一起的片部上以形成尿布的腰围的横向相对的侧边。具有相对较高熔点的一个片被引入与所述的热压装置相接触，以防止上片粘结在热压装置上(即使被熔化时)。
下面将参照附图更详细地描述用本发明的方法所制作的这种紧身内裤型的一次性使用尿布。
图1是一种紧身内裤型的一次性使用尿布的立体图；
图2是在未经折迭时的该尿布的平面视图；
图3是沿图2X-X线所取的部分剖视图；
图4是表示一种超声波加工的示意图；
图5A和5B是呈不同结构的粘接区域的剖视图；
图6A、6B和6C是类似于图3的表示出不同结构的视图。
图1是示出采用本发明方法所获得的一种紧身内裤型的一次性使用尿布1的立体图。
尿布1包括：一可渗液体的上片2，它由聚丙烯纤维材料的熔粘无纺布制备的；一由聚乙烯片制取的不可渗液体的背片3，以及设在上片2、背片3之间的一个吸液芯4。该尿布1一般还由一前身片5、一后身片6及一个胯部7构成。前身片5和后身片6以上片2面向内的方式，一片置于另一片的上部，并按沿着裤子1腰部的每一横向侧垂直地延伸的一条间断的超声波熔接线被熔接在一起。从吸液芯4的横向相对侧边向外延伸的背片3的一部分限定了前、后前片5、6的翼状部分21、22(这一点将会更详细地说明)，而与这些翼状部分21、22连结的片件3A由聚丙烯片组成。
图2是在熔接之前的尿布1A的平面视图，尿布1A沿前、后身片5、6的纵向未经折迭(伸展)和部分断开。如前所述，在该尿布1A中，从吸液芯4的横向侧边向外延伸出的前、后身片5、6的部分限定了前、后身5、6的翼状部分21、22。在这些翼状部分21、22上，用熔点比上片2高的聚丙烯薄膜制成的片件3A接结于背片3的侧边上。在尿布1A的横向相对侧边上设有一对在上片2上纵向延伸出的折片31。每一折片31沿其外边25及纵向相对两端26、27连接于上片2以使其内边28在一弹性件29的作用下能高出上片2的上表面，该弹性件29是在伸长状态时与内边28相连结的。
图3是沿图2的X-X线所取的翼状部分21的部分剖视图。该翼状部分21包括一个在上片2侧上的片件2A和片件3A。再请参照图3，该片件3A包括连结于背片3的一聚丙烯片件。在该翼状部分21上，一方面是上片2和背片3，另一方面是片件2A和片件3A，它们分别用热熔粘胶33连结成一体。在此应理解到，沿图2上的Y-Y线所取的翼状部分22的剖视图基本上是与图3所示的相同，因此可不予说明。
图4是一示意侧视图，图中说明了尿布1A沿着一中心线C-C向内对折以及如握手似的置放一起的前、后身片5、6的翼状部分21、22用超声波焊接装置40熔接一起的方式。这种超声波焊接装置可以是一种传统的型式，它包括一个与超声波振荡器(未图示)相连接的电极臂41和一个固定砧座42，翼状部分21、22固定在这两者之间并被熔接一起以形成一个熔接区15(图1)，这个熔接区与电极臂41的前端形状相一致。
图5A和图5B该熔接区15的示意剖视图，其中图5A示出图4的尿布1经过超声波加工后所得的该熔接区15，而与本发明的方法相比较，图5B示出翼状部分21、22的片件2A和片件3A分别用聚丙烯无纺布和用聚乙烯片制作的情况。在图5A所示的例子中，聚丙烯粘度的减小并不显著和熔接是在相当高的粘熔状态下发生，因此电极臂41在熔接区15上的压印是圆形的，就产生一个不会刺激使用者皮肤的光洁面。另一方面，在图5B所示的例子中，在需要把内部的聚丙烯无纺布的彼此相对部分熔接在一超时，外部的聚乙烯薄膜就较早地熔化成过分低的粘度并且容易粘结在电极臂41和砧座42上。在经冷却之后，该熔接区15就出现粗糙表面，这个粗糙表面就可能给使用者的皮肤以痒的刺激。
图6A、6B和6C为局部剖视图，图中表示出相互间不同的和与图3所示的也不同的结构。在图6A所示的例子中，上片2是由聚丙烯的熔粘无纺布构成，而背片3是由一聚乙烯薄膜制成的。在翼状部分21中，片件2A包括用热熔粘胶33连结于上片2的一聚乙烯薄片以便形成上片2的一个伸出部分，而片件3A是由背片3的一个延伸部构成，其中片件2A和片件3A具有同样的熔点。在图6B所示的例子中，由一聚乙烯膜片组成的片件2A粘接于上片2，上片2是用含有60％或更高百分比的PET纤维材料的无纺布制成，而由一聚丙烯薄片组成的片件3A被连结于由一聚乙烯薄片制成的背片3上。最后，在图6C所示的例子中，从聚丙烯的熔粘无纺布制取的折边31的外侧部分25被连结到用与折边31相同的无纺布制作的上片2的侧边上。折边31的外侧部分25要有足够的宽度以形成片件2A，而由聚丙烯膜片组成的片件3A连接于由一聚乙烯膜片组成的背片3上。在本发明的范围内，可从具有不同熔点的纤维混合物来制成各个片件2A和片件3A也是可以的，也在各片件上的不同熔点应理解为总数占该片件重量的60％或更高的百分比的各种纤维之间的不同熔点。
片件3A的熔点应等于或高于片件2A的熔点，而最后是高于后者的熔点，这是为了有助于形成一个由热压装置得到的理想的浅而小的压印。
在由聚丙烯构成的无纺布用于制取作为本发明的一实施例所示出的尿布1中的上片2和片件2A时，聚丙烯由于它的光洁度和密度，可使非织纤维变得柔软，而将尿布1穿到使用者身上时会有舒适的感觉。使用聚乙烯膜片作为后片3就可用这种相当便宜的膜片来得到舒适而柔软的手感。然而还可想到用另一种方法来代替本发明的方法，这另一种方法包括步骤：用上片2和背片3的延伸部分形成片件2A和片件3A，以及把具有相当高的熔点的一盖片置于片件3A上并与之熔接，这种方法的缺点在于，在腰部的横侧上的片件数大为增加并可引起不舒适的硬的手感。
根据本发明的方法，由于片件3A的熔点高于片件2A的熔点，因此，即使在使片件2A足够熔化到使它们相互间能熔接的温度的条件下，该片件3A也不足够熔化到粘结到诸如超声波电极臂这样的热压装置上。用此方法，本发明解决了已有技术未能解决而遗留的问题，这个问题是，熔接区在冷却后，就会出现粗糙表面，这个粗糙表面会给使用者的皮肤以痒的刺激和(或者)破坏尿布的美观。

Claims (3)

1.一种制作一次性使用尿布的方法一般包括以下的步骤：把可渗液的上片、一不可渗液的背片以及设在上片和背片之间的一个吸液芯安置成一次性使用尿布的结构，使从所述吸液芯的横向相对侧边向外延伸出的前、后身片的翼状部分一个置于另一个之上，以及在热压之下把所述的翼状部分熔接一起以在所述前、后身片的腰线上形成横向相对侧边部分，所述的方法还包括下列步骤：
把一膜片连结在每个翼状部分的上片和背片中至少一片上以形成其一个伸出部分并由此提供所述翼状部分的背片，该背片的熔点高于翼状部分的上片的熔点，以及沿尿布的每腰侧把上片和背片熔接在一起。
2.如权利要求1所述的方法，其特征在于，所述的上片的熔点要比背片的熔点高，而在所述翼状部分里与所述上片相连结的一膜片的熔点要低于所述的背片的熔点。
3.如权利要求1所述的方法，其特征在于，所述的上片的熔点要比背片的熔点高，而在所述翼状部分上连结于背片的一膜片的熔点要比所述上片的熔点高。
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ES2111278T3 (es) 1998-03-01
JP3177341B2 (ja) 2001-06-18
GB2278993A (en) 1994-12-21
JPH06327714A (ja) 1994-11-29
MY112873A (en) 2001-10-31
CN1095581A (zh) 1994-11-30
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AU6313794A (en) 1994-11-24
US5507895A (en) 1996-04-16

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