CN1183714A - 一次性曳拉型短裤 - Google Patents
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Abstract
一种曳拉型短裤,在其前区(26)和后区(28)上有一条连续的围带(38),用以分布在穿用过程中产生的力以便该曳拉型短裤能够更好地贴合在穿用者身上。在一个优选实施例中,曳拉型短裤具有一个主体层(40),该主体层(40)是一个限定了一个前区、一个后区和一个裆区(30)的连续的薄片;一个第一围带层(42)接合在前区中的主体层上;一个第二围带层(44)接合在后区中的主体层上;弹性的叠层片(46,48,50)被设置在围带层和主体层之间,该叠层经过了机械拉伸,从而在前区和后区的侧片(64)中形成能够弹性伸长的拉伸叠层;接缝(32)将前区接合在后区上,从而形成腿部开口(34)和腰部开口(36)。连续的主体层和围带层则形成曳拉型短裤的连续的围带。由于围带层横跨腰区连续地延伸,并且不覆盖整个裆区,又由于主体层因此便暴露在裆区中,所以该曳拉型短裤具有独特的外观,使消费者感到在其腰区有布状的感觉而在其裆区则具有密封特性。
Description
本发明涉及一次性的曳拉型短裤,这种短裤的穿法是,将穿用者的双腿***到该短裤的腿部开口中,然后使该短裤向上滑到围绕着穿用者的下部躯体的位置上。这种一次性曳拉型短裤的例子有,一次性的短裤,曳拉型尿布,训练短裤和妇女月经期使用的一次性短裤。本发明特别是涉及一种整体型的一次性曳拉型吸湿短裤,例如曳拉型尿布,训练短裤,失禁者穿的曳拉型三角裤等,这类物品为穿用者增加了舒适感,提高了防泄漏能力以及持续的动态贴合性能。
婴儿和其他的失禁者都要穿用如尿布一类的一次性吸湿用品,借助这类用品来吸收并保持尿及其它的身体***物。具有固定式侧边的吸湿性短裤(例如训练短裤或曳拉型尿布)已被普遍用于会走路并常常要接受上厕所训练的儿童。为了既能容纳身体***物又能适合于较大范围的身体形状和尺寸,这些短短裤必须温暖舒适地贴合在穿用者的腰部和腿部,并且不会从它在躯体上的位置下垂、松脱或滑落,同时能够适合于较大的穿用者使用,不至于因为穿得太紧而刺激穿用者的皮肤。因此,必须采用具有很大的伸长率的弹性部件使这种短短裤的腰部和腿部具有弹性伸缩性。
许多训练短裤和曳拉型尿布都采用普通的弹性部件,它们在弹性收缩状态下固定在腰部和腿部的开口处。通常,为了确保能够象在耐用型短裤上那样围绕着腿部和腰部形成完整的弹性贴合,在腿部开口和腰部开口上沿着开口的曲线环绕一些橡胶的或其它材料的松紧带。这些短短裤通常可以称作“气球型的”短短裤,因为由松紧带在它们的特定区域引起收缩,而它们的其它部分则朝外裤方向鼓起。1992年12月15日授予Igaue等人的第5171239号美国专利和1986年9月9日授予Strohbeen等人的第4610681号美国专利公开了几种这样的短短裤。尽管由于收缩的弹性开口能够伸长以适合于各种尺寸的穿用者,因而这些短短裤能够适合于不同的腰部和腿部尺寸,但这类短短裤也只能适合于有限范围的尺寸,因为弹性元件处于收缩状态,并且不具有很大的伸缩性。在腰部开口和腿部开口使用的窄的松紧带还容易将“贴紧”力集中在穿用者身体的一个很窄的区域中,容易在穿用者的皮肤上产生压痕。并且,这类产品的侧边和其余部分通常不具有弹性伸缩性,因此削弱了贴合作用。
为了解决气球型短裤的这一缺陷,有些生产商在产品的整个前片和后片上都放上了松紧带。例如,1993年9月16日公开的第WO93/17648号专利公开了一种短裤型的尿布,该尿布的前部和/或后部都是可以弹性伸缩的,吸湿芯的两端被设置在这些区域中。这些附加的松紧带将该短裤的包括吸湿芯的端部在内的整个前腰部和后腰部都收缩起来。这使得该产品在腰区能够有更大的伸展性能,但却导致吸湿芯在腰部开口处收拢和聚成一束。这种收拢和成束沿着吸湿芯产生一些通道,使身体***物能够顺着这些通道汲出或流出腰区,因而导致在腰部更容易发生泄漏。吸湿芯的这种收拢还影响了该产品的外观,使该产品看上去不象气球型短裤那样美观。
1990年7月10日授予Van Gompel的第4940464号美国专利公开了另一种训练短裤,其中的短裤状的短裤是通过将一些独立的可伸长元件附着到短裤主体的侧边上构成的。这种可伸长的元件可以通过伸长来与穿用者的尺寸相适合,使该用品能够适应尺寸的变化。但是,主体与可伸长的元件的缝合是该产品及其生产过程中的主要问题。必须将接缝做得非常结实,并且能够承受使用过程中的较大的力。短裤在使用过程中要承受很大的力和应力,这些力和应力可能引起侧片从主体部分上断开或撕开。并且,对这些独立的可伸长元件的控制使得生产过程极大地复杂化,也使得这些短裤对消费者来说更为昂贵。与主体部分的接缝还容易将贴紧力集中到该产品的顶部和底部,使得该短裤的接缝更易撕开,贴合性能更差。
1993年9月21日授予Hasse,Bndges和Miller的第5246433号美国专利公开了一种具有拉伸叠层的侧片和弹性的腰带和腿带的短裤。侧片中的拉伸叠层使产品的侧部具有了伸缩性,从而使短裤能够更好地适合于穿用者。拉伸叠层与短裤的其余部分一体构成,从而克服了由于短裤有一些独立、分散的弹性片状部件附着于其上所带来的缺点,同时能提高普通的气球型短裤的贴合性能。但是,这些短裤又有这样一个缺点,即,它的侧片没有足够的伸缩性来保证穿用者本人能够轻易地穿上该短裤。这篇专利中公开的拉伸叠层提供了有限的拉伸量。此外,用于形成拉伸叠层的材料在使用过程中会出现撕破或碎裂一类的问题,最终导致生产商将这种产品废弃掉。
所有这些产品的另一个缺点是产品的透气性不佳。短裤的一些片段通常是由会阻碍这类产品的透气性的薄膜或泡沫制成的。缺乏透气性可能使穿用者感到闷热。
因此,本发明的一个目的是提供一种具有很强的拉伸性能的一次性曳拉型短裤,这种短裤能够适合于很大尺寸范围内的穿用者。
本发明的另一个目的是提供这样一种一次性曳拉型短裤,该短裤在使用过程中能够承受由穿用者施加的很大的力,同时不会使吸湿芯聚集成束,能够沿着两腿产生一个力,以便与两腿相适合,同时不会压出红印,并且能够围绕着腰部形成固定的贴合。
本发明的又一个目的是提供一种具有一条连续的围带的一次性曳拉型短裤,该条带具有一些弹性伸缩能力各不相同的区域,不会使吸湿芯聚集成束,同时在腰部和腿部能够形成更好的贴合。
本发明的又一个目的是提供一种至少在侧片、更为可取的是在腰带区具有很好的透气性的一次性曳拉型短裤,所具有的透气性使得蒸汽得以传输,从而使短裤不造成闷热。
本发明的一次性曳拉型短裤最好是如曳拉型尿布或训练短裤一类的能够承受在使用过程中所受到的力、同时结构比较简单、成本比较低的整体型的一次性曳拉型短裤。在该曳拉型短裤的前部和后部装有一条连续的围带,用以分布在使用过程中产生的力以便使该曳拉型短裤更好地适合于穿用者。该连续的围带有一个由一片可以弹性地收缩的腰带片和一个不聚成束状的中间片组成的中片,在中片的两侧各有一个可伸长的侧片以及接缝片,因而该短裤的侧边和上腰中央能够伸展,使该短裤容易被穿上,在使用过程中随着穿用者运动,使该短裤在穿用过程中保持与穿用者的贴合,并使吸湿芯贴紧人体,从而更好地容纳***物,同时使吸湿芯不会因聚成束状而增加泄漏的机会。在一些特别优选的实施例中,在曳拉型尿布上采取了一些措施使得蒸汽能够通过通气孔或小孔传输,或者采用能够透气的材料制作短裤,使得曳拉型尿布不会对使用者产生不舒适的感觉。
在一个特别优选的实施例中,曳拉型尿布具有一个主体层,该主体层由构成一个前区,一个后区和一个裆区的连续的薄片形成;在前区上有一个接合在主体层上的第一围带层;在后区上有一个接合在主体层上的第二围带层;在这两个围带层和主体层之间有一个弹性的片状部件,这个叠层经过机械拉伸,在侧片的前区和后区中形成能够弹性地伸长的拉伸叠层。两条接缝将前区和后区接合在一起形成腿部开口和腰部开口。连续的主体层和围带层与其它部件结合在一起形成曳拉型短裤的连续的围带。由于围带层横跨腰区连续地伸展,并且不覆盖整个裆区,同时由于主体层因而在裆区是外露的,所以该曳拉型短裤具有独特的外观,使消费者感到在腰部有象布一样的感觉,而在裆区则有更好的密封性能。该曳拉型短裤最好还具有一个弹性的腰片和两个弹性的腿片,更可取的是具有如顶片和吸湿芯一类的容纳身体***物的吸湿组件,最可取的是至少在侧片中有一些小孔和通气孔以加强该曳拉型短裤的透气性。
尽管本说明书的末尾附有特别指出并清楚限定了构成本发明的主题的权利要求,但据信,通过下面结合附图所作的说明,本发明将得到更好的理解,在这些附图中,相同的标号用于表示大体上相同的部件,其中:
图1是本发明的一次性曳拉型短裤处于通常的使用状态的透视图;
图1A是本发明的一次性曳拉型短裤处于其展平的非收缩状态时的简化平面图,图中示出了该短裤的各个片段或区域;
图2是本发明的一次性曳拉型短裤处于其展平的非收缩状态时的平面图,图中示出了该短裤的外表面,并且剖去了它的一些部分以展示其主体层的结构;
图3是沿图2中的3-3剖面线剖取的图2所示曳拉型短裤的局部剖视图;
图4是本发明的一次性曳拉型短裤处于其展平的非收缩状态时的平面图,图中示出了该短裤的内表面,并且剖去了它的一些部分以展示其主体层的结构;
图5是本发明的一次性曳拉型短裤的一个备选实施例的剖视图;
图6是本发明的一次性曳拉型短裤的另一个备选实施例的剖视图;
图7是本发明的一次性曳拉型短裤的又一个备选实施例的剖视图;
图8是用在本发明的一次性曳拉型短裤的裆区中的一种备选的弹性腿片的局部剖视图;
图8A是图8所示的弹性腿片在前区中的局部剖视图;
图9是本发明的一个备选实施例的平面图,其主体层被“开了窗”,以提高该曳拉型短裤在腰带片中的透气性;
图10是本发明的一次性曳拉型短裤的另一备选实施例的剖视图;
图11是本发明的一种接缝形式的平面图;
图12是特别适合于用作本发明的拉伸叠层中的弹性片状部件的弹性体材料的应力/应变曲线图,应力的单位是克/英寸宽样品;
图13是本发明的没有微孔的拉伸叠层的应力/应变曲线图,包括拉伸曲线和恢复曲线,应力的单位是克/英寸宽样品;
图14是图13中的拉伸叠层的应力/应变曲线图,应力的单位是克/1英寸宽样品。
在本文中,“曳拉型短裤”一词表示一种供人穿用的物品,它具有一个确定的腰部开口和一对腿部开口,将它穿到穿用者身上的方法是,将两腿***到两个腿部开口中,再将该物品向上拉到腰上。“一次性”一词表示不打算对这种短裤进行洗涤或以其它方式回收或再次作为一条短裤使用(即,这种物品在用过一次后将被丢弃,最好是回收,制成肥料或以一种与环境相容的方式对其进行其它形式的处理)。“整体型的”曳拉型短裤表示由一些独立的部件结合成一个统一的整体而形成的曳拉型短裤,但是侧片不是接合到一个独立的主体上的独立部件,因为侧片是由也构成短裤的中央片或主体的至少一层材料构成的(即,该短裤不需要如独立的主体和独立的侧片一类的单独的手控部件)。这种曳拉型短裤最好还是“吸湿性的”,以吸收并容纳从身体中排出的各种***物。本发明的曳拉型短裤的一个优选实施例是图1所示的整体型一次性曳拉型吸湿短裤,即曳拉型尿布20。在本文中,“曳拉型尿布”一词表示通常由婴儿及其他失禁者穿来吸收并容纳尿及粪便的曳拉型短裤。但是,应该懂得,本发明也适用于其它曳拉型短裤,如训练短裤、失禁者穿的三角裤、妇女卫生内裤或衬垫等。
图1是本发明的曳拉型尿布20的透视图。曳拉型尿布20具有一个外表面22,一个与外表面22相背的内表面24,一个前区26,一个后区28,一个裆区30和一条将前区26和后区28接合在一起形成腿部开口34和腰部开口36的接缝32。围绕着腰部开口36形成一个连续的围带38。连续的围带38的作用是动态地产生贴紧力和分配在穿用过程中动态地产生的力。曳拉型尿布20最好是包括一个主体层40;一个第一围带层42;一个第二围带层44;一个位于前区26的每个侧片中的可以弹性地伸缩的拉伸叠层,即前拉伸叠层46;一个位于后区28的每个侧片中的可以弹性地伸缩的拉伸叠层,即后拉伸叠层48;一个位于前区26和后区28中的弹性的腰片50。曳拉型尿布还包括一弹性腿片52。(在另一个实施例中,最好是至少在曳拉型尿布20的侧片中开一些缝或孔(未示出)以产生透气性和通风性)由于第一围带层42和第二围带层44(即两个围带层)最好是具有布状外观的非纺网面,而主体层40最好是一层塑料薄膜,所以该曳拉型尿布20具有独到的美观之处,即它让护理者和穿用者感觉到在腰部有短裤似的舒适感同时在裆部则有好的密封性。
图1A是图1中的曳拉型尿布20处于其展平的、非收缩状态时的简化平面视图,该图示出了尿布的各个片段和它们彼此间的相对位置。“片段”一词在此处表示曳拉型尿布或围带上的一个区域或元件。(尽管一个片段通常是一个独立的区域或元件,但一个片段也可以与一个相邻的片段有一定程度的重合(功能上相互对应)。)曳拉型尿布20具有一个裆区30,一个前区26和一个后区28。裆区30包括一个主片56和一对腿部翼片58;前区26包括一个由腰带片60和中间片62组成的中片,一对侧片64,以及一对接缝片66;后区28包括一个由腰带片60′和中间片62′组成的中片,一对侧片64′,以及一对接缝片66′。裆区30是曳拉型尿布20的这样一个部分,连续的围带(其它各个片段)从该部分向外伸展。尽管通常使吸湿芯伸到围带的中间片62和62′中,但一般都将吸湿芯放置在主片56中,因为***物通常都排到这个区域中。腿部翼片58通常沿着主片56的各侧边68朝横向伸出。各腿部翼片58通常构成弹性腿片的至少一部分。连续的围带(前区26和后区28)通常沿着裆区30(主片56和腿部翼片58)的各横向边缘69朝纵向伸出。在前区26中,中片的中间片62通常沿着裆区30的横向边缘69朝纵向伸出。腰带片60沿着中间片62朝纵向伸出。各侧片64沿着中片朝横向伸出。各接缝片66沿着各自的侧片64朝横向伸出。在后区28中,中片的中间片62′沿着裆区30的另一条横向边缘69朝纵向伸出。腰带片60′沿着中间片62′朝纵向伸出。各侧片64′沿着中片朝横向伸出。各接缝片66′沿着各自的侧片64′朝横向伸出。前区26除了其各片段以外,还有一条底边70,两条腿边71,以及两条侧边72。后区28除了其各片段以外,还有一条底边70′,两条腿边71′,以及两条侧边72′。裆区30具有两条腿边74。
图2是图1中的曳拉型尿布20处于其展平的非收缩状态时(即,已将除侧片64以外的片段中的由弹性引起的收缩拉平,而侧片64中的拉伸叠层(前拉伸叠层46和后拉伸叠层48)则处于松驰状态)的局部剖视图,尿布20的外表面22朝向读者,前区26和后区28尚未被接缝32接合在一起。曳拉型尿布20的外表面22是在使用过程中不与穿用者的身体接触的部分。在图示的实施例中,曳拉型尿布20的外表面22包括处在前区26中的第一围带层42,处在后区28中的第二围带层44,以及处在裆区30中的主体层40。(尿布的内表面24与外表面22相背,该内表面是尿布在使用过程中与穿用者的身体相贴的那个部分。)
在图2所示的实施例中,主体层40最好是由限定前区26、后区28和裆区30的一个连续的薄片或网面构成。因此,主体层40是曳拉型尿布的主要层面。(在本文中,“层”一词不一定限于一个单层的材料,一个“层”实际上可以由所需材料的若干个薄片或网面组成的叠层构成。)主体层40具有一个内表面76(图2中未示出)和一个外表面77。主体层40的内表面76和外表面77在方位上与曳拉型尿布20的内表面24和外表面22对应。由于主体层40最好是限定了前区26,后区28和裆区30,所以主体层40也具有前面定义的相应的区域和片段。(为简便起见,在图中用与图1A中表示曳拉型尿布的相应区域和片段的相同的附图标记来表示这些区域和片段。)第一围带层42位于主体层40的处在前区26中的外表面77上,并且在横向上从一条侧边72横穿前区26连续地延伸到另一侧边72,在纵向上从端缘70至少延伸到端缘71。最好是将第一围带层42接合到主体层40上。第二围带层44位于主体层40的处在后区28中的外表面77上,并且在横向上从一条侧边72′横穿后区28连续地延伸到另一侧边72′,在纵向上从端缘70′至少延伸到端缘71′。最好是将第二围带层44接合到主体层40上。于是,各个围带层与主体层40结合起来构成一个围绕着穿用者的腰部的连续的围带(如图1所示)。如下面将要详细描述的,该围带的不同区域具有不同的弹性伸缩性能,由此加强曳拉型尿布20的贴合和容纳性能。
在前区26和后区28的各侧片中形成可以弹性伸缩的拉伸叠层(前拉伸叠层46和后拉伸叠层48)。每个前拉伸叠层46至少包括第一围带层42的处在侧片中的部分以及一个接合于其上的弹性的片状部件78,而在这一具体的实施例中,主体层40的这一部分构成侧片。弹性的片状部件78最好是处在主体层40和第一围带层42之间,更为可取的是从端缘70向纵向延伸,最为可取的是延伸到腿缘71。每个后拉伸叠层48至少包括第二围带层44的处在侧片中的部分以及一个接合于其上的弹性的片状部件78′,而在这一具体的实施例中,主体层40的这一部分构成侧片。弹性的片状部件78′最好是处在主体层40和第二围带层44之间,更为可取的是从端缘70′向纵向延伸,最为可取的是延伸到腿缘71′。在图2所示的曳拉型尿布实施例中,每个拉伸叠层最好还包括顶片80的处在侧片中的部分(隔离层)。每个拉伸叠层最好是经过了机械拉伸或拉制(用拉紧线表示),从而使其至少在横向上能够弹性伸展。(横向(X方向或宽度方向)被定义为平行于该曳拉型尿布的横向中线的方向;纵向(Y方向或长度方向)被定义为平行于纵向中线的方向;轴向(Z方向或厚度方向)被定义为贯穿曳拉型尿布的厚度延伸的方向。)
在前区26或者后区28的腰带片上或者在这两者的腰带片上装有弹性的腰部部件50。弹性的腰部部件50是一个可以弹性伸展的部件,最好是一个收拢在一起的可以弹性收缩的部件,从而在中片内动态地贴合在穿用者的腰上。在图示的实施例中,弹性的腰部部件50最好是由一个整体的腰罩/腰带82构成,该腰罩/腰带82以一种被拉长、可以弹性地收缩的状态接合到顶片80的主层上。整体的腰罩/腰带82可以充当一个阻挡***物从曳拉型尿布20的腰部开口泄漏出来的屏障,同时也是一个将曳拉型尿布20贴合在穿用者的腰部周围的可收缩的腰带。在最为优选的实施例中,该整体的腰罩/腰带还是透气的,使水蒸汽可以贴着腰部开口从曳拉型尿布中排出。
曳拉型尿布20还具有弹性腿片52,用于加强裆区30在两腿处的贴合。曳拉型尿布20还具有一个顶片80和一个位于顶片80和主体层40之间的吸湿芯,构成一个吸湿组件,与连续的围带结合在一起以容纳***物。还可以在侧片中设置一些微孔或通气孔,用以产生透气性或通气性。
图3是沿图2中的在前区26中的3-3线剖取的本发明的曳拉型尿布20的剖视图。图中示出主体层40构成曳拉型尿布20的主层或主要层面,并且具有一个内表面76和一个外表面77。第一围带层42位于主体层40的外表面77上,构成曳拉型尿布20在前区26中的外表面22。最好是将弹性的片状部件78放置在第一围带层42和主体层40之间。顶片80位于并且接合在主体层40的内表面76上。顶片80最好是由一个可以透过液体的主层86和两个隔离层88组成。隔离层88从主层86沿横向向外延伸到侧边72。每个隔离层88包括一个翼片部分90和一个直立部分92。直立部分92不附着在主层86上,以便在使用过程中使弹性的间隔部件94产生的收拢力能够引起直立部分92从主层86的表面直立出去,形成一个隔离层或壁。翼片部分90从直立部分92(近侧边)沿横向向外延伸到侧边72。吸湿芯84最好是位于主层86和主体层40之间。后区28的结构最好是与前区26的结构相同。
图4是本发明的曳拉型尿布20处于其展平的非收缩状态时(即,已将除侧片64以外的片段中的由弹性引起的收缩拉平,而侧片64中的拉伸叠层则处于松驰状态)的部分剖视图,尿布20的内表面24朝向读者,前区26和后区28尚未被接缝接合在一起。为了提供容纳身体***物所需要的吸湿性,曳拉型尿布20包括一个可以透过液体的顶片80和一个位于顶片80和主体层40之间的吸湿芯84。在图4所示的实施例中,顶片80最好是由三个不同的层接合在一起形成。一个可以透过液体的主层86被放置在吸湿芯84上面,用以将液体迅速地吸收到尿布中。隔离层88接合在主层86上,并且最好是可以拉长的,更为可取的是具有疏水性,从而使侧片在受到机械拉伸时不会被撕破或撕裂,同时沿着曳拉型尿布20的侧边形成隔离收口。隔离层88具有一个翼片部分90和一个凹道或直立的部分92,以形成弹性腿片52的不同组成部分。弹性腿片52最好是具有一个密封收口和一个隔离收口。形成密封收口的可取的方法是,将一个或多个弹性的腿部部件96在拉伸状态下接合到主体层40或隔离层88上或接合在这两者之上,最好是在裆区30的腿部翼片内接合在主体层40和隔离层88的翼片部分90之间,由此形成密封收口。隔离收口最好是由一个翼片(隔离层88的直立部分92)、一个用来将直立部分92的纵向端缘固定在主层86上的封闭件98和一个在拉伸状态下接合到直立部分92上的弹性的间隔部件94构成。
在图1所示的本发明的曳拉型尿布的结构中,围绕着腰部开口36形成连续的围带38。该围带38的作用是,当曳拉型尿布位于穿用者的身上时,在该曳拉型尿布中动态地产生贴紧力,即使在曳拉型尿布中装了身体***物的情况下也能将其保持在穿用者身上,由此保证吸湿芯与穿用者的身体紧密相贴,并且将在穿用过程中动态地产生的力分布在腰的周围,从而为吸湿芯提供辅助的支持作用,使吸湿芯不会在曳拉型尿布的中间片内成束或收拢。将围带设计成在某些区段可以弹性地伸长,而在围绕着腰部开口的其它区段则至少可以弹性地伸长,最好是可以弹性地收缩;在围绕着腿部开口的部位可以弹性地伸长;并且在中间片内放置吸湿芯的部位上不会收拢或成束。围带的弹性伸缩性还具有一个“力/伸长界面”,当超过该“力/伸长界面”时,围带不再弹性地伸长,以便该曳拉型尿布更容易被穿上,这是因为尿布不会被过分拉长,因而更容易滑过臂部。“力/伸长界面”对于自己穿尿布但不太会将整个可伸长的尿布安全拉到臀部上的小孩来说特别重要。围带也可以借助于包裹吸湿芯的围带网面来改善穿着时的应力。最后制成的尿布在其围绕着穿用者的腰部的贴合处不再那么庞大。围带中的位于吸湿芯之上的部分不出现收拢或收缩,加上横跨整个吸湿芯的围带的连续性,使得在围带中产生的周向应力的基础上形成一个连续的法向力,在穿用过程中将吸湿芯压在穿用者的身体上,从而改善了尿布的贴合性能。这样,比起那些在吸湿芯区域形成弹性收缩或聚拢的尿布,或者比起那些没有围带来将周向应力集中并且分布在围绕吸湿芯区的区段上的尿布,本发明的尿布的吸湿芯能够保持更为紧密的贴合,使穿用者更感到舒适,不易松脱。
如图1A所示,位于前区26和后区28中的围带38各包括一个由腰带片60和60′及中间片62和62′组成的中片,位于中片两侧的侧片64和64′,以及位于各侧片64和64′外侧的接缝片66和66′。侧片是可以弹性伸长的,从而在曳拉型尿布的侧面形成贴合。腰带片是可以弹性伸长的,最好是可以弹性收缩或收拢的,从而在曳拉型尿布的腰部开口的中部形成更好的贴合。为了在使用过程中保持吸湿芯的完整性,中间片是不收拢的。尽管如上面所讨论的,中间片可以是能够弹性伸长的(但不收拢),但在图1-4所示的实施例中,中间片最好不是能够伸长的。连续的围带38可以由下面确定的多种不同的材料和层面构成。围带38包括至少一个第一围带层42和一个第二围带层44,这两个围带层在接缝片66和66′的两侧接合在一起。在图1-4所示的实施例中,围带38最好是由主体层40的一部分、围带层(前区26中的第一围带层46和后区28中的第二围带层44)、侧片中的拉伸叠层(前拉伸叠层46和后拉伸叠层48)以及在各腰带片内的弹性的腰片50组成,腰带片最好是包括一个在伸长状态下、以可以弹性收缩的方式接合于其上的整体的腰罩/腰带82,从而将围带38收拢在腰带片60和60′中。
在本发明的一些优选实施例中,主体层40总体上决定了曳拉型尿布20的总体形状。主体层40是曳拉型尿布的主要结构层,尿布的其它部件可以加到或接合于其上。因此,主体层分布在曳拉型尿布的整个或大部分表面上,尽管在某些实施例中可以将主体层的一些部分开孔或切除或去掉(“开窗”),以提高曳拉型尿布或者曳拉型尿布的处在该区域上的部件的伸缩性和透气性。因此,主体层最好是由一个没有“接头”或接缝的连续的薄片或网面构成,使力能够在整个主体层上均匀地传递。如前面所讨论的,主体层的连续薄片或网面可以由单层的网面材料构成,也可以由几个连续网面的叠层构成,或者由几层不同的材料构成。主体层构成连续的“围带”的一个部分,该部分具有将尿布保持在穿用者身上所需要的力/伸长特性,同时能够伸展,以便能够轻易地将曳拉型尿布穿到穿用者身上。主体层可以构成曳拉型尿布的外表面或内表面或外表面或/和内表面的一部分,或者可以整个地位于曳拉型尿布的内部。在图1-4所示的本发明的实施例中,主体层最好是构成曳拉型尿布在裆区中的外表面,以形成曳拉型尿布的独特的外观。
由于为了形成侧片中的拉伸叠层而对主体层40的至少一部分进行了机械拉伸,所以主体层最好是能够伸长的,更为可取的是能够拉长的(但不必是弹性的),使主体层在受到机械拉伸时能够至少在一定程度上永久性地伸长,不会完全回到其未变形时的原始形态。因此,主体层可以由任何一种用于制造吸湿用品的公知材料制成,例如织造的或非织造的网面;由聚乙烯或聚丙烯或它们的混合物制成的热塑性薄膜一类的聚合薄膜;这些材料的叠层;或者复合材料。在一些优选实施例中,可以在有最小的撕裂或撕破或没有撕裂或撕破的情况下对主体层进行机械拉伸。因此,主体层40最好是一层聚合薄膜。
由于主体层40最好是一层聚合薄膜,所以它一般也是不能透过液体(例如尿)的,所以它也能充当一个阻止吸收及容纳在吸湿芯中的***物弄湿床单和短裤一类与曳拉型尿布接触的物品的部件(即,它起到传统的尿布的底片的作用)。如果主体层不是防渗透的,则要在吸湿芯之外加一层如传统的底片一类的层面。主体层在必要时也可以是透气的(使空气或水蒸汽能够透过)。尤其是,由于各围带层、最好是各隔离层都是可以拉伸的非织造网面,以加强拉伸叠层承受力的能力,又由于在裆区不需要高的横向抗拉强度的材料,所以主体层也可以由具有微孔的并且通常也是低强度和低伸长率的透气材料制成。这种薄膜的一个例子是由Exxon Chemical Company生产的商品名称为EXXAIRE的薄膜。用作本发明的主体层的具有比较好的拉伸性但不透气的薄膜的有代表性的例子是由Clopay Corporation of Cincinnati,Ohio生产的牌号为Clopay 1041的聚合薄膜或可以从Tredegar of Terre Haute,Indiana购得的牌号为X-8323或X-9954的薄膜。
主体层的尺寸由将要穿用该曳拉型尿布的穿用者的尺寸决定。在一个优选实施例中,主体层具有改进的砂漏形状,能够更好地与穿用者相贴合。在一个打算用于大婴儿(大约9公斤至大约15.4公斤)的优选实施例中,主体层40的长度最好是大约483mm(大约19英寸),在前区和后区的宽度大约是234mm(大约91/4英寸),在裆区的宽度最好是大约165mm(大约61/2英寸)。中片的宽度为135mm(大约51/4英寸),侧片的宽度为大约41mm(大约15/8英寸),侧片的活动部分的宽度为大约32mm(大约11/4英寸),接缝片的宽度为大约8.5mm(大约5/16英寸)。(在本文展示的优选实施例中,接缝片的实际重叠区的宽度为大约11mm。)前区的长度为大约114mm(大约41/2英寸),后区的长度为大约165mm(大约61/2英寸),裆区的长度为大约220mm(大约85/8英寸)。
围带层(第一围带层42和第二围带层44)最好是与主体层40和其它部件结合在一起,围绕着曳拉型尿布20的腰部开口36形成一条连续的围带38。因此,各围带层最好是由一个没有“接头”或接缝的连续的薄片或网面构成,使力能够在整个围带层上均匀地传递。(各围带层的连续薄片或网面可以由单层的网面材料构成,也可以由几个连续网面的叠层构成,或者由几层不同的材料构成。)围带层的材料最好还为侧片中的拉伸叠层提供一定的强度,以便将各层材料叠合在一起,并使得机械拉伸不至于造成材料的过分撕扯、撕破或碎裂。
在图1-4所示的实施例中,围带层最好是位于并且接合在主体层的外表面上,从而形成曳拉型尿布的外表面的一部分。但是,也可以将围带层置于主体层的内表面上,并且,在某些实施例中,可以构成曳拉型尿布的内表面的一部分。后面将展示并描述几个这类的备选实施例。围带层至少是在侧片中借助于固定件(未示出)接合在主体层上。本文描述了一些合适的固定件。围带层跨越曳拉型尿布的各个腰区(前区或后区)连续地横向伸展,形成本文所述的连续的围带38,并且沿纵向从端缘伸展到裆区附近。或者,可以使围带层沿纵向伸展到裆区内,使曳拉型尿布更加具有短裤似的感觉。尽管第一围带层和第二围带层最好是沿纵向向内延伸并且在裆区中留有一个它们之间的空隙,从而达到本文所述的美观效果,但在必要时也可以使它们彼此重叠,以展现一种整块布状的外观和感觉。
由于在侧片中的围带层要受到机械拉伸,所以围带层最好是可伸长的,更为可取的是可拉长的(但不必是弹性的),不会出现过分的或甚至是任何的撕破或撕扯。并且,由于围带层最好是位于曳拉型尿布的外表面,所以围带层最好还是柔软的,并且对穿用者的皮肤没有刺激性,使尿布具有布制短裤的手感和舒适性。合适的围带层可以由多种材料制成,例如塑料薄膜;多孔塑料薄膜;天然纤维(例如木纤维或棉纤维)的织造或非织造网面;合成纤维(例如聚烯烃,聚酰胺,聚酯,聚乙烯或聚丙烯纤维),或者天然和/或合成纤维的组合;或者经过涂覆的织造或非织造网面。可取的是,围带层由合成纤维的非织造网面制成。
在一般的非织造网面中,当网面从机械拉伸辊之间经过时,会造成网面的一些区域的局部撕扯。这种撕扯可能导致这种非织造网面缺乏所需要的可伸长性或导致各纤维缺乏可拉伸性。本发明的优选的非织造网面具有很高的可伸长性,并且最好使每根纤维都可以被拉伸,使各纤维之间的接头不会被扯坏或断裂。因此,围带层最好是具有很好的伸长性的非织造网面,与一般的含有较少的可拉伸纤维的非织造网面相比,这种非织造网面通常伸长得更为均匀,发生局部撕裂的可能性最小。这种非织造网面的例子包括聚乙烯或聚丙烯混纺纤维的纺粘网面。更为可取的是,围带层由聚乙烯纤维、聚乙烯与聚合物的混纺纤维或者聚乙烯/聚丙烯与聚合物的混纺纤维的纺粘网面制成。可用作围带层的典型的聚乙烯纤维的纺粘非织造网面有:由Polybond Co.of Waynesboro,Virginia制造的#87257;由Corovin of Peine,Germany制造的COROLIND 17184;以及由Fiberweb of Simpsonville,S.C.制造的纤维网面E1004204.
围带38的处在侧片64和64′中的部分是可以弹性地伸长的,由于该曳拉型尿布的侧边可以伸缩,所以围带38能够通过在一开始就将曳拉型尿布合适地贴合在穿用者的身上然后在直到尿布中装入了***物的整个穿用过程中通过将力分布在腰上和腿上来保持住这种贴合来形成更为舒适及服贴的贴合。侧片在至少一个方向上,可取的是在一个具有横向矢分量的方向上,更可取的是在横向上是可伸长的,以便实现更好的贴合。但是,应当注意,侧片在其它任何方向上或者在多于一个的方向上也可以是可伸长的。此外,侧片可以具有一个或多个伸长率不连续的区域。
侧片中的弹性伸长性可以通过多种不同的材料和结构来获得。围带的不同部分(例如围带的各层或主体层)可以由普通的弹性材料制成,或者围带的侧片可以由多种不同的弹性叠层结构构成。例如,如1965年1月14日授予Buell的名称为“Contractable Side Portions For a Disposable Diaper”的美国第3860003号专利所述,围带的侧片可以由一种弹性材料在拉伸状态下以能够弹性地收缩的方式接合到一层或多层非弹性的部件(围带层或主体层或这两者)上构成,本文引用这篇专利作为参考文献。或者,侧片可以由如1995年2月9日公开的The Procter&Gamble公司的名称为“Web Materials ExhibitingElastic-like Behavior”的第WO95/03765号专利申请所描述的一种结构类似弹性的薄膜(SELF)网面制成,这篇专利申请被本文引作参考文献。尽管可以用本领域中公知的多种不同的可伸长的或弹性的材料来制作围带的侧片,但最好还是用一种拉伸叠层来制作围带的一个或多个或各个侧片。
拉伸叠层(前拉伸叠层46和后拉伸叠层48)是曳拉型尿布的一体化元件(即,它们不是固定在曳拉型尿布上的分立的手控元件,而是由曳拉型尿布的各个层面(至少是围带层,最好还有主体层)中的一层或多层的延伸部分构成)。在一个优选实施例中,各拉伸叠层由主体层的一部分、各个围带层的一部分、位于主体层和围带层之间的弹性的片状部件以及隔离层的一部分组成。
在本发明的一个优选实施例中,将弹性的片状部件78在拉伸状态下接合到侧片中,最好是接合在主体层和围带层之间,以使拉伸叠层至少在横向上是可以弹性地伸长的。“弹性地伸长”一词指的是一个片段或部分在受到拉力(对侧片而言通常是横向拉力)时至少在一个方向(对侧片而言最好是横向)上会伸长,而当拉力解除时会恢复到其原先的尺寸和形状。业已发现,特别适合于用作弹性的片状部件(特别是零应力拉伸叠层)的弹性体材料是以苯乙烯嵌段共聚物为基本成分的弹性体薄膜,其厚度最好为0.05mm-0.064mm(0.002in-0.0025in),例如由Clopay Corporation of Cincinnati,Ohio制造的商品名称为PA18-2870的薄膜;或者由Exxon Chemical of Baytown,Texas制造的Exxon500系列弹性薄膜。图12示出了上述的PA18-2870弹性体材料的应力-应变(力/伸长率)曲线。该应力/应变曲线表示当在大约23℃(室温)的温度下受到以50.8cm/min(20in/min)的速率施加的应变或拉伸时,每一英寸宽的样品中的力(以克为单位)的曲线的一般形状。可以用作该弹性的片状部件的其它合适的弹性体材料包括“有回弹性的”合成或天然橡胶,其它合成或天然橡胶的泡沫,弹性体薄膜(包括热缩性的弹性体薄膜),弹性的织造或非织造网面,稀松布,弹性复合物等。
在一个特别优选的实施例中,以将处于基本上未拉伸(零应变)状态的弹性的片状部件固定在主体层或围带层或这两个层面上的方式将其接合在侧片上。然后对这样得到的含有弹性的片状部件的复合拉伸叠层的至少一部分进行足以使该拉伸叠层的非弹性部件(主体层、隔离层,以及围带层)产生永久伸长的机械拉伸。然后使该复合拉伸叠层恢复到其基本上未拉伸时的状态。于是,侧片成为了一种“零应变”的拉伸叠层。(或者,将处于拉伸状态的弹性片状部件接合到侧片上,然后再对其进行机械拉伸;当然这样不如“零应变”的拉伸叠层可取。)在本文中,“零应变”的拉伸叠层表示一种包括至少两层材料的叠层,这两层材料以一种基本上未拉伸(“零应变”)的状态沿着它们的共同伸长表面的至少一部分彼此固定在一起。其中的一层是一种可以拉伸的弹性材料(即,在拉力解除后它将基本上恢复到其未拉伸时的尺寸),而第二层是一种可以伸长的(但不必是弹性的)材料,当受到拉伸时,第二层至少在一定程度上产生永久性的伸长,因此,当外加的拉力解除时,它不会完全恢复其未变形时的原始形态。于是,这样得到的拉伸叠层至少在初始拉伸点的范围内在初始拉伸的方向上具有了弹性伸缩性。用于制造拉伸叠层的特别可取的方法和装置采用了啮合槽纹滚筒来对各组成部分进行机械拉伸。1992年12月1日授予Weber等人的第5167897号美国专利、1990年10月20日授予Buell等人的第5156793号美国专利和1992年9月1日授予Weber等人的第5143679号美国专利都公开了特别优选的装置和方法;这些专利都被本文引作参考文献。
既可以采用一种间断粘合的形状也可以采用一种基本上连续的粘合形状将弹性的片状部件有效地接合到拉伸叠层中的主体层或围带层或这两者上面。此处的“间断地”粘合的叠层网面指的是这样一种叠层网面,其中的各层在一些分散的点处彼此初始粘合在一起;或者指的是这样一种叠层网面,其中的各层在一些分散的区域彼此基本上没有被粘合到一起。相反,“基本上连续地”粘合的叠层网面指的是这样一种叠层网面,其中的各层在整个接触区上都基本上连续地彼此初始粘合在一起。由于最好是将拉伸叠层粘合到整个或大部分拉伸叠层上,所以非弹性的网面(围带层,主体层以及隔离层)伸长或拉伸时不会引起撕扯。最好是以一种能够使拉伸叠层中的所有层在逐渐增强的机械拉伸之后彼此之间保持比较紧密的粘附的形式来粘结拉伸叠层中的各层,最好是用一种粘结剂将弹性的片状部件和拉伸叠层中的各层基本上连续地粘合到一起。在一个特别优选的实施例中,以大约0.00116克/平方厘米(0.0075克/平方英寸)的单位面积重量和一种螺旋形状(如美国第391117号专利(Sprague,Jr)和美国第4842666号专利(Werenicz)所示)来施加粘结剂。螺旋线的宽度为大约1.9cm(0.75in),并且彼此紧靠在一起或稍有重叠(少于2mm)。粘结剂优选由Findely Adhesives销售的H2120牌一类的产品。或者,可以用热焊接、压力粘接、超声焊接、动力机械粘接或本领域中公知的其它任何方法将弹性片状部件和拉伸叠层的其它部件彼此间断地或连续地粘结在一起。
业已发现,拉伸特性包括拉伸力,拉伸模量,以及有效伸长;并且拉伸叠层的收缩力和收缩率对于拉伸叠层以及曳拉型尿布的性能而言都是至关重要的考虑因素。拉伸特性和贴紧力在使用过程中给为穿用者穿尿布的人以及穿用者本人以总体的“拉紧”感觉。这也关系到为穿用者穿尿布的人以合适的拉紧程度将尿布穿到穿用者身上的能力(即,为了使尿布在被穿上的过程中具有能够被“正常地”感觉到的张力,总的拉伸量应当是达到/保持良好的服贴所需要的拉伸量)。具有较大的拉伸模量/拉伸力的拉伸叠层会在穿用者的皮肤上勒出红印,而具有较小的拉伸模量/拉伸力的拉伸叠层会造成尿布在穿用者身上松脱。拉伸叠层的有效伸长太小就不能使尿布与身体达到适当的贴合,因此会使穿用者感到该尿布不舒适,并且不容易穿上。具有很小的收缩力(或者弹性蠕变过大、弹力过分松驰,或者非弹性过分“塑化”)的拉伸叠层可能不能在穿用者身上保持定位,并且可能在穿用者身上引起滑脱,从而不能实现良好的贴合和密封。
就本发明的拉伸叠层而言,业已发现,拉伸力和拉伸模量一类拉伸特性最好是在一个确定的范围内。图13示出本发明的一个优选的(不通气的)拉伸叠层的两个拉伸/恢复周期的伸长/力响应曲线。在大约23℃的温度下以50.8cm/min(20in/min)的速率对拉伸叠层样品进行初始拉伸,并在200%的伸长状态下保持30秒。然后使样品以同样的比率松驰下来。在一分钟的时间内使样品不受约束,然后以同样的比率和条件对其进行第二次拉伸。初始拉伸的拉伸力最好是在100%伸长率时大于或等于大约100克/英寸。更为可取的是,初始拉伸的拉伸力在100%伸长率时在大约150克/英寸至大约225克/英寸之间。最为可取的是,初始拉伸的拉伸力在100%伸长率时在大约160克/英寸至大约200克/英寸之间。在伸长率为200%时,初始拉伸的拉伸力最好是在大约200克/英寸至大约400克/英寸之间,更为可取的是在大约240克/英寸至大约320克/英寸之间。拉伸叠层的在穿着范围(20%至140%)内的第二周期恢复力在恢复时最好是在大约25克/英寸至大约200克/英寸之间,更为可取的是在大约60克/英寸至大约150克/英寸之间。这些值与伸长和恢复之后的标准穿着力对应。
力壁是拉伸曲线上的随着伸长量的加大力迅速变大的部分。由于力壁的存在,因而在围带没有过大的附加拉伸的情况下就可以产生附加的曳拉力。这使得这种短裤更容易被穿上,特别是更容易被穿用者自己穿上。在力大于400克/英寸时便出现力壁。因此,对于拉伸叠层来说,在超过了预期的最大设计伸长率之后,伸长率增加50%或不到50%就会产生一个大于400克/英寸的力。如图14所示,拉伸叠层的力壁通常在伸长率大于200%(这种拉伸叠层的最大预期设计伸长率)时便会产生。伸长率从200%增加到250%会产生一个大于400克/英寸的力。
有效伸长是拉伸叠层中的材料在穿用过程中为贴合穿用者的身体而产生的可逆伸长的最大值。因此,有效伸长与为穿用者穿尿布的人为将尿布穿到穿用者身上而导致的伸长的最大值有关。此外,尿布能够产生的可恢复伸长的最大值与穿用者的身体有关。用这个公式计算有效伸长:((伸长后的长度-原始长度)/原始长度)X100。利用拉伸叠层来将尿布穿上所需要的有效伸长的最小值最好是至少为大约75%,更可取的是至少为100%,比较可取的有效伸长的范围是100%-250%,最好是大约200%。
连续的围带38在中片内的部分、最好是至少在从吸湿芯纵向外伸的腰带片60和60′中的部分也最好是能够弹性地伸缩的。弹性伸缩性由一个弹性的腰片50产生。弹性的腰片50是一个至少在横向上能够弹性地伸缩、最好是能够弹性地收缩的部件,从而使连续的围带上的包括侧片的拉伸叠层和腰带片中的弹性腰片的部分能够与穿用者的腰部动态地贴合,以形成更好的贴合。因此,沿着腰部开口的力的作用线通过腰带片中的弹性腰片在侧片中的拉伸叠层的上部分解。因此,弹性腰片一般是围带上的从端缘延伸到吸湿芯的边缘的那个部分。弹性的腰片最好是能够弹性收缩的,以便将从吸湿芯纵向外伸的腰带片收拢,以使得短裤的中片逐渐变细,从而更好地与穿用者相贴合。
弹性腰片50至少包括围带层(第一围带层42或第二围带层44)的延伸部分,最好是还包括曳拉型尿布的一个其它部件的延伸部分,例如主体层40或顶片80或这些元件的任意一种组合的延伸部分,这些部分是单独的(如果这些层中的一层是可伸长的或可缩短的)或者上面加有弹性材料。弹性腰片50可以具有若干种结构,包括本文在论及拉伸叠层时所讨论过的结构、本领域公知的弹性腰带或者例如1985年5月7日授予Kievit和Osterhage的名称为“Disposable Diapers With Elastically Contractible Waistband”的美国第4515595号专利以及1992年9月29日授予Buell,Clear和Falcone的名称为“Absorbent Article With Dynamic Elastic Waist Feature Having A PredisposedResilient Flexural Hinge”的美国第5151092号专利所公开的具有弹性的腰带、以及前面引用过的WO 95/03765号专利描述的用一种结构类似弹性的薄膜(SELF)制成的弹性腰带;这些文献都已被本文引作参考。
在图4所示的本发明的一个优选实施例中,弹性的腰片50包括一个整体的腰罩/腰带82,该整体的腰罩/腰带82位于顶片80上并且以一种能够弹性收缩的状态有效地接合在顶片80上,从而将曳拉型尿布20的腰带片60或60′收拢。整体的腰罩/腰带82最好是由一种包括一层非织造的覆盖层、一层弹性体层以及最好还有一个第二非织造的覆盖层的叠层制成。1991年6月25日授予Robertson的名称为“Absorbent Article Having Unitary Waistcapand Waistband”的第5026364号美国专利公开了一种可以用于此处的整体的腰罩/腰带,这篇文献被本文引作参考。弹性体层最好是一种弹性体薄膜,例如由Exxon Chemical以Exxon 500的商品名销售的经过了大约50%至100%的预拉伸的弹性体薄膜。在把该整体的腰罩/腰带有效地接合到曳拉型尿布的位于中片处的顶片上后,该整体的腰罩/腰带与曳拉型尿布的最下层一起在被拉伸到达67%(在这一特定的实施例中为1英寸)的伸长率时会产生最好是在大约100克/英寸至大约300克/英寸之间的拉伸力,更为可取的是产生在大约150克/英寸至大约200克/英寸之间的拉伸力。在这一优选实施例中,该整体的腰罩/腰带还产生至少37mm(11/2inchs)的收缩(即,在整个尿布中产生76mm(3inchs)的收缩),由此在曳拉型尿布的上部形成一种逐渐缩小的贴合。
在一个特别优选的实施例中,整体的腰罩/腰带是透气的,使水蒸汽能够从曳拉型尿布的前区和后区中蒸发出去。在整体的腰罩/腰带上产生透气性的办法有:为该区选择比较透气的材料和/或象本文在描述侧片中的拉伸叠层时所讨论的那样在该区域上穿孔或扎眼。
不将围带38的中间片62和62′收拢,以便使吸湿芯84在使用过程中不会聚集成束。在图1-4所示的优选实施例中,中间片62和62′最好是不可伸长的,以便保持吸湿芯84的整体性。或者,使用可伸长的但非收缩的材料制作中间片,使中间片能够弹性地伸长,但不成束。例如,中间片可以由本发明用在侧片中的那种零应力拉伸叠层或如前面提到过的被本文引作参考文献的WO95/03765所述的结构类似弹性的薄膜(SELF)网面制成。如果中间片被制成能够伸长的,则最好使吸湿芯“悬浮着”(不将吸湿芯固定在中间片上),以保持吸湿芯的完整性,并且不会对中间片的伸长产生限制。
接缝片66和66′是围带38上的准备由制造者缝合或粘合到一起以形成腰部开口36和腿部开口34的部分。如图1A所示,接缝片66和66′在横向上从各侧片64和64′延伸到侧边72或72′,在纵向上通常是从端缘70或70′分别延伸到腿边71或71′。接缝片最好是主体层和其它部件(如围带层和顶片或这些部件的任何其它方式的组合)的延伸。在一个优选实施例中,各接缝片由主体层、围带层、弹性片状部件和顶片的隔离层的一部分构成(在接缝片中,拉伸叠层最好未受机械拉伸的影响,尽管在必要时它也可以被拉伸,以便使这一区域具有附加的伸长性能)。
参照图1,最好是以将前区26的接缝片66与后区28的接缝片66′粘合到一起的方式形成接缝32。可以用多种不同的方式形成接缝32。例如,可以将外伸的两个接缝片的一部分结合到一起形成外伸的飞边接缝,将内伸的两个接缝片的一部分结合到一起形成内伸的飞边接缝,将接缝片搭接着结合到一起形成搭接接缝,或者采用不卷边的侧接缝一类的本领域中公知的任何一种接缝形式将两个侧片结合到一起。1993年8月7日授予Russell P.Bridge的名称为“Disposable Training Pant Having Fusion-Slit Side Seams”的美国第5236430号专利公开了一种不卷边的接缝,这篇专利被本文引作参考。本发明的接缝的结合手段可以是本领域中公知的任何一种适合用于处理本发明中的接缝片的特定材料的手段。因此,声封、热封、压粘接、粘接、缝合、自身粘合等等,都可以是适合的技术。
在本发明的一个优选实施例中,通过将前区26中的接缝片66和后区28中的接缝片66′叠合在一起形成搭接接缝的方式形成曳拉型的尿布20。最好是如图11所示的那样利用热/压或超声焊接的方式将侧片接合到一起。在这种特定的接缝中,焊接图形包括两排椭圆形的焊点。接缝片的搭接区的总宽度X为大约11毫米(约0.4375英寸),在此基础上,焊缝的总宽度W为大约6毫米(约0.240英寸)。每个焊点的宽度w为大约2.5毫米(约0.1英寸),高度h为大约1毫米(约0.04英寸)。在每一排中的焊点的中心距离s为大约2毫米(约0.08英寸)。其它图形、尺寸和间距也可以考虑。由于第一围带层42、主体层40的一部分、在前区的侧片中的弹性片状部件78的一部分、隔离层88的一部分、第二围带层44、主体层40的第二部分、在后区的侧片中的弹性片状部件78′的一部分以及隔离层88的一部分都叠合在一起,所以接缝32非常结实,在曳拉型尿布的使用或穿着过程中不会撕裂或撕破。
通过在接缝片中增加一定量的聚合材料能够使接缝更结实。可以利用具有较大的单位面积重量的非织造材料、较厚的弹性薄膜或通过向接缝片中加入几层材料来增加接缝片中的聚合材料的量。例如,可以将几层弹性薄膜或非织造网面加入到接缝片中。或者,可以使形成尿布的各层伸到接缝的预期区域之外、然后再将它们折回到接缝片中,由此使接缝片的层数增加。上面引用过的美国第5236430号专利讨论了几种这类的接缝。
除了连续的围带38以外,曳拉型尿布还包括一个延伸到穿用者的***构成裆区30的主体层组件(主片56和腿部翼片58)。裆区30一般包括至少一个外覆盖层。最好还包括一个吸湿芯84。在图1-4所示的实施例中,外覆盖层包括主体层40和顶片80。主体层组件最好还包括弹性的腿片52。
弹性的腿片52改善了裆区30和整个腿部开口周围对液体和其它身体***物的密封作用。每个弹性的腿片52可以有几种不同的用于减少身体***物在腿部翼片58(弹性腿片可以、有时也被称作腿带、侧翼、隔离收口或弹性收口)处发生泄漏的实施方式。1975年1月14日授予Buell的名称为“Contractable Side Ponions For A Disposable Diaper”的美国第3860003号专利描述了一种一次性尿布,这种尿布具有一个可收缩的腿部开口,所述的开口具有一个侧翼和一个或多个弹性部件,形成一个用弹性件制成的腿部收口(密封收口)。1990年3月20日授予Aziz及Blaney的名称为“DisposableAbsorbent Article Having Elasticized Flap”的美国第4909803号专利描述了一种具有“直立的”弹性护翼(隔离收口)的一次性尿布,其中的弹性护翼改善了腿部的隔离性能。1987年9月22日授予Lawson的名称为“AbsorbentArticle Having Dual Cuffs”的美国第4695278号专利描述了一种具有包括一个密封收口和一个隔离收口的双重收口的一次性尿布。1989年1月3日授予Dragoo的名称为“Absorbent Article Having Leakage-Resistant Dual Cuffs”的美国第4795454号专利公开了一种具有防泄漏的双重收口的一次性尿布,其中的顶片未连到尿布的侧边,以防止***物渗出到短裤的侧边。这些专利都已被本文引作参考文献。尽管可以将各个弹性的腿片做成与上述的腿带、腿翼、隔离收口或弹性收口中的任何一个相似的形状,但各弹性的腿片最好是由一个密封收口和一个隔离收口结合在一起构成。最好是以Dragoo的专利及本文所讨论的方式形成密封收口和隔离收口。
在本发明的一个备选实施例中,腿部翼片58还可以由上面引用的WO95/03765所述的结构类似弹性的薄膜(SELF)网面构成。腿部翼片的SELF网面在横向上具有伸缩性。通过将SELF网面设在弹性的腿部部件附近、之上或之外,形成密封收口,使曳拉型尿布具有一个贴近腿部的区域,该区域在由于装了很多***物因而需要额外的空间时可以伸展,还形成了一种舒适的贴合,减少了由松垂造成在腿部泄漏的可能性。当尿布中装了***物因而变重了时,重力造成可伸长的腿部翼片在横向上伸展,由于这种伸展,收口不会被重力往下拉并从腿上松脱,因而减少了在腿部的松脱。结果是,密封收口的活动独立于吸湿芯的活动,所以形成了更好的贴合和密封。此外,SELF网面加大了尿布的密封收口的柔软度,使婴儿更感到亲切舒适。事实上,在需要时,主片也可以由SELF网面或者能够在纵向上伸长的机械拉伸叠层制成,使腿部开口能够在纵向上伸长,从而适合于腿较粗的穿用者。
最好是将吸湿芯84贴着主体层40的内表面76放置,并且最好是利用例如本领域中公知的固定手段(未示出)将吸湿芯84接合在内表面76上。例如,可以用一个均匀连续的粘接剂涂层、一个带图案的粘接剂涂层、或由一系列独立的线条、螺旋线、或点组成的粘接剂涂层将主体层固定到吸湿芯28上。业已发现,由Findley Adhesive of Wauwautosa,Wisconsin制造的商品名为Findley H2120的粘接剂比较令人满意。固定手段最好是如1986年3月4日授予Minetola及Tucker的名称为“Disposable Waste-Containment Garment”的美国第4573986号专利所公开的那种开口丝网形的粘接剂,这篇文献已被本文引用作为参考。一种典型开口丝网形的粘接剂由几条绕成螺旋形的粘接剂丝构成,例如由下述专利所示的装置和方法中公开的那样,这些专利是:1975年10月7日授予Sprague,Jr.的美国第3911173号专利;1978年11月22日授予Ziecker等人的美国第4785996号专利;1989年6月27日授予Werenicz的美国第4842666号专利。上述的这些专利都已被本文引作参考文献。或者,固定手段还可以是热粘接、压力粘接、超声焊接、动力机械连接、或者其它合适的固定手段或者本领域中公知的这些固定手段的组合。
吸湿芯84可以是任何一种总体上柔软,服贴、对穿用者的皮肤无刺激性并且能够吸收并保持诸如尿和其它特定的身体***物一类液体的吸湿品。可以将吸湿芯制成多种尺寸和形状(例如,矩形、砂漏形、“T”形、不对称形,等等),还可以用多种常用于制造一次性尿布和其它吸湿品的吸液材料(例如统称为气毡的碎木浆)来制造吸湿芯。其它合适的吸湿材料包括皱状纤维填料;包括共同成形、交联的纤维素纤维的熔喷树脂;具有织物套的织物;吸湿泡沫;吸湿海绵;超级吸湿聚脂;吸湿性凝胶材料;或任何相当的材料或这些材料的组合。吸湿芯的形状和结构也可以有所不同(例如,吸湿芯可以具有不同的厚度区、亲水梯度、超级吸湿梯度、或低平均密度和低平均单位重量接收区;或者可以具有一层或多层结构)。但是,吸湿芯的总吸湿容量应当与曳拉型尿布的设计负载和预期用途相符。另外,吸湿芯的尺寸和吸湿容量可以有所不同,以适合从婴儿到成人范围内的各类穿用者。
吸湿芯的一种优选实施例呈不对称的、变形的砂漏形状,并且具有一个朝向穿用者的身体的表面(内表面)和一个与朝向身体的表面相背的短裤表面。1994年11月1日授予Lash,Moore及Young的名称为“AbsorbentStructures Containing Stiffened Fibers And Superabsorbent Material”的美国第5360420号专利描述了一种已被广泛接受并且获得了商业成功的可用作本发明的吸湿芯的吸湿结构。这些专利已被本文引作参考文献。可取的是,如被本文引作参考文献的1986年9月9日授予Weisman及Goldman的名称为“High-Density Absorbent Structure”的美国第4610678号专利所公开的那样,吸湿芯包括一个由化学硬化的纤维素纤维制成的接收/扩散层和一个位于该接收/扩散层之下的、由木浆纤维和超级吸湿材料的混合物制成的存储层。
顶片80与吸湿芯84的朝向身体的表面相邻,并且最好是借助于例如本领域公知的固定手段(未示出)接合在吸湿芯84及主体层40上。在描述将吸湿芯接合在主体层上时已描述了合适的固定手段。在本文中,“接合”一词强调的是通过将一个元件直接附加在另一个元件上而把该元件直接固定在另一个元件上的结构,以及通过将一个元件附加在一个或几个中间元件上再把中间元件附加在另一个元件上而把该元件间接固定在另一个元件上的结构。在一个优选实施例中,顶片和主体层通过直接接合在吸湿芯上或弹性的片状部件上或者曳拉型尿布的其它部件上而间接地接合在一起。
顶片80最好包括一种三部件结构,如被本文引作参考文献的、1989年1月3日授予Dragoo的名称为“Absorbent Article Having Leakage-ResistantDual Cuffs”的美国第4795454号专利公开的那种三层结构。如图4所示,顶片80包括一个主层86和一个接合在主层86上并从主层86横向外伸的隔离层88。主层86是一种可以透过液体的材料,使液体能够迅速透过其整个厚度并被吸湿芯吸收。两个隔离层最好是疏水性的,以防止***物泄漏到尿布的外侧,并且最好是可拉伸的,以加强拉伸叠层。
主层最好是摸起来很柔软,并且对穿用者的皮肤无刺激性的。主层是液体可以透过的,使液体(如尿)能够轻易地透过其整个厚度。很多种材料都可以用于制造合适的主层,例如多孔泡沫、网状泡沫、多孔塑料薄膜或三维扩展的成型薄膜、或者天然纤维、合成纤维或天然与合成纤维的组合物的织造或非织造网面。可取的是,主层选择由Fibertec,Inc.of Landisville,N.J.制造的牌号为6701的产品。
在图3所示的实施例中,主层86与主体层最好是不连续的,使液体不会沿着主层并通过主层渗到曳拉型尿布的边缘,因而不会渗透到由隔离层形成的直立的隔离收口之下或之外,并且可以将更多的可以拉伸的材料放置到侧片中以使拉伸叠层更为结实。主层最好是覆盖吸湿芯的朝向身体的表面的大部分区域,更可取的是覆盖吸湿芯的至少是处在裆区的整个朝向身体的表面,使***到曳拉型尿布的***物能够透过主层而被吸湿芯吸收。主层朝着吸湿芯的侧边横向外伸,最好是至少在裆区要伸到吸湿芯的侧边之外。但是,主层终止在裆区的腿部边缘的内侧。在最可取的结构中,主层终止在隔离层的近侧边附近(即,主层的终止端位于靠近近侧边处)或者终止端位于近侧边内侧并远离近侧边。在本文中,“附近”一词表示主层终止在近侧边,但主层材料的少部分区域可能由于制造过程中的机器误差或制造过程中主层区域的变动而伸到近侧边的内侧或外侧。
在图3所示的顶片80的优选实施例中,隔离层88构成弹性的腿片52(最好是一个密封收口和/或一个隔离收口),并且最好还构成拉伸叠层的一个部分。
为了形成图3所示的密封/隔离收口的弹性腿片,隔离层88最好具有一个翼状部分90和一个直立的(凹道)部分92。直立部分92具有一个近侧边95和一个远侧边95′。尽管翼片部分90最好是隔离层88的一个连续的部分,但也可以用固定到直立部分92上的另一片材料构成翼片部分90,使翼片部分90具有不同于直立部分92的物理特性、尺寸和特征。事实上,如果需要的话,可以将尿布中的翼片部分或直立部分省去。如美国第4795454号专利(Dragoo)所述,直立部分92构成并且限定了隔离收口的翼部。直立部分的近侧边95最好是位于弹性的腿部部件96和纵向中线之间,最为可取的是位于弹性的腿部部件96和吸湿芯84的至少是在裆区中的侧边之间,以便沿着近侧边形成密封。为了形成直立的隔离收口,最好是至少在裆区30处不要将远侧边95′固定到曳拉型尿布的主体层元件上。最好是利用封闭件98(例如本文描述过的任何一种封闭件)将直立部分的端部接合到曳拉型尿布的主体层结构,即基础层上,以强化隔离收口的直立功能。隔离层88的直立部分92最好是疏水性的,以减少***物从曳拉型尿布泄漏的机会。
在本发明的一个优选实施例中,最好是对前区26和后区28中的隔离层88的翼部90的至少某些片段进行机械拉伸,以便分别在侧片64和64′中形成拉伸叠层。因此,至少是翼部90,更可取的是整个隔离层88是可以伸长的,更可取的是可以拉长的(但不必是弹性的),使隔离层在受到机械拉伸时能够至少在一定程度上发生永久性的伸长,不会完全恢复到其原始形状。在一个特别可取的实施例中,可以在不产生过分的撕扯或撕裂的情况下对隔离层进行机械拉伸。因此,隔离层最好是可以伸长的,更可取的是可以拉长的,最为可取的是疏水性的。适用于隔离层的材料包括多层适合于用作围带层的材料。一种可以用作隔离层的优选材料是纺粘型聚乙烯或聚丙烯混纺纤维网。适合于用作隔离层的材料是由Fiberweb NA.of Simpsonville,N.C.生产的E1004203牌纺粘型聚乙烯混纺纤维网。
还可以在曳拉型尿布20上穿一些孔或扎一些眼,使空气和水蒸汽能够通到曳拉型尿布的内部或从其内部散发出来。在一个优选实施例中,多孔被设置在侧片中。这种结构防止了***物从吸湿芯附近区域泄漏出去但又使尿布中的空气和水蒸汽得以交换因而能够通风,因此尿布不会因被汗水一类分泌物弄得过分湿而使穿用者感到不适。还可以在曳拉型尿布的其它片段或曳拉型尿布的某些部件上开一些孔。例如,可以在前区或后区的腰带片中开一些孔,使腰带区具有通风性和透气性,以及/或者在整体型的腰罩/腰带上开一些孔以进一步加强尿布的通风性能。
在曳拉型尿布的侧片中最好有许多孔,最好是将一些大孔或一些小孔排列成确定的形状。这些孔的直径在大约0.3-2.5毫米的范围内,其中大孔的直径在大约1-2毫米的范围内,小孔的直径在大约0.5-0.9毫米的范围内。形成这些孔的办法可以是往织物中穿一些洞或孔,也可以是利用超声或热/压一类自动自身粘合技术形成孔。1951年3月6日授予Cutler的美国第2544069号专利和1989年5月30日授予Kielpikowski的美国第4834738号专利描述了这类的孔和成形技术,这些专利都被本文引作参考文献。这些孔最好贯穿尿布的所有层,侧片中的拉伸叠层的所有层,使通风孔从尿布的内侧延伸到外侧。或者,可以只将通风孔制作在一个或多个层面中,或者由缝或切口而不是用孔构成通风口。
也可以通过选用本领域中公知的能够透气或透过蒸汽的材料作为制造曳拉型尿布的材料来产生透气性。例如,主体层可以由一种透气(可透过蒸汽)但不能透过液体的塑料薄膜制成。弹性的片状部件可以是如泡沫、烯松布、无纺布或透气的弹性薄膜一类稀松的材料,以进一步加强曳拉型尿布的透气性。
本发明的曳拉型尿布20可以由护理者或穿用者本人穿到穿用者身上。一般说来,要把腰部开口36撑大以便使穿用者能将其一只脚伸到其中一个腿部开口34中。然后将另一只脚伸到另一个腿部开口34中。然后将曳拉型尿布20通过穿用者的躯干向上拉到其腰上。由拉伸叠层产生的力壁使被拉上来的尿布围在臂部上而不是进一步被撑大,因此对穿用者自己穿这种曳拉型尿布特别有帮助。这样,曳拉型尿布就被穿好了,并且可以容纳和保持由身体排出的***物。将曳拉型尿布从穿用者身上脱下来的办法是将其通过两腿往下脱或者将曳拉型尿布上的靠近接缝的部分撕开。
图5是本发明的曳拉型尿布的另一种实施例的剖视图。如图5所示,主体层540构成曳拉型尿布520的内表面24。因此,主体层540起到顶片的作用。因此,在该实施例中,主体层540最好是由一种可以透过液体的非织造网面制成。主体层540的材料最好是前面在论及形成顶片的主层时讨论过的非织造材料。第一围带层542与主体层540的外表面577相邻。第二围带层(未示出)也与主体层的该外表面相邻。此外,中底片层510(最好是由一种不能透过液体的塑料薄膜制成)位于处在主体层40的外表面577上的第一围带层542的内表面上,因此成为曳拉型尿布的底片。弹性片状部件78位于主体层540和第一围带层542之间,形成前拉伸叠层。吸湿芯84最好是位于主体层540的外表面577上,最好是处在主体层540和中底片层510之间。弹性腿片的隔离收口514最好是一片接合在主体层540的内表面576上比较窄的条形材料(隔离翼),正如上面引用过的授予Lawson的美国第4695278号专利所述。隔离收口的翼片可以由非织造的网面、塑料薄膜、或非织造网面和塑料薄膜的叠层制成。
如图5所示,拉伸叠层另外还有一个最好是位于主体层540和弹性的片状部件78之间的加强层512。加强层512的作用是使拉伸叠层“应力加强”,使对拉伸叠层的较强的机械拉伸(应变)不会在拉伸叠层中引起局部的撕裂或孔洞。如前面所讨论的,特别是在对拉伸叠层进行的机械拉伸操作遇到了很高的拉伸力时,某些材料比其它材料更具可拉伸性。因此,将一种更易拉伸的材料与一个可拉伸性差一些的材料合并到一起能够获得一个组合式拉伸叠层,该拉伸叠层能够在受到较大程度的拉伸的情况下不产生材料的过分撕扯。这对于本发明的采用非织造织物制作主体层540的实施例尤为重要。由于主体层540起到曳拉型尿布20的顶片的作用,因此该主体层通常由一种容易透过液体但总体上不如其它非织造材料的可拉伸性好的材料制成。因此,该实施例的主体层540在为形成拉伸叠层而受到机械拉伸处理的过程中容易被撕碎或撕破。在进行机械拉伸之前,将一层比主体层540的可拉伸性好的加强层512叠放在主体层540上,跨接主体层540中的撕扯部分,使整个拉伸叠层在使用过程中不会被损坏或出现破洞。
因此,可以用多种可拉伸的材料制作加强层512来使拉伸叠层具有必要的强度。这种加强层包括塑料薄膜、Procter&Gamble公司销售的“DRI-WEAVE”一类多孔塑料薄膜,或者非织造网面。为了使拉伸叠层具有透气性,最好是用多孔塑料薄膜或一种非织造材料制作加强层。更为可取的是,用本文描述过的那些可用作围带层的非织造材料制成加强层。
如前面所讨论的,最好是将加强层贴着强度较弱的层放置以使强度较弱的层具有一定强度。在图5所示的实施例中,最好是将加强层512放在主体层540的外表面577上,尽管在需要时也可将其放置在主体层540的内表面上。也可以在拉伸叠层中另加一些加强层,并可将它们贴着拉伸叠层的任何一个组成部件放置。
图6表示图5所示的曳拉型尿布的另一种实施例。主体层640起到顶片的作用。第一围带层642位于主体层640的外表面677上,最好是在中片中直接与主体层640相贴。在侧片中,弹性的片状部件78被放置在第一围带层642和第二围带层640之间。这样便形成了一个没有中介元件的连续的围带。所以,力能够围绕着腰部开口连续地分布及传递。中底片层610位于第一围带层642的外表面612上,并构成曳拉型尿布620在裆区和在前区及后区的中片上的外表面22。吸湿芯84位于中底片层610和第一围带层642之间。由于第一围带层642覆盖着吸湿芯84延伸,所以第一围带层最好也是可以透过液体的。因此,第一围带层642可以由本文在前面讨论过的纺粘聚乙烯纤维的非织造材料制成,但事先例如通过加一种合适的表面活性剂使其具有了足够的透过液体的能力。也可以在侧片中加入一层或多层加强层以防止主体层640和第一围带层642被过分撕扯。
图7是图5所示的曳拉型尿布的又一种实施例的剖视图。在该实施例中,吸湿芯84被放置在主体层740和第一围带层742之间。由于第一围带层742被放置在吸湿芯84的朝向衣服的表面上,所以不必是能够透过液体的,该第一围带层742最好是可以拉伸的,并且由前面描述过的周作围带层的材料制成。中底片层710被放置在第一围带层742的外表面712上,并构成曳拉型尿布720在裆区和在前区及后区的中片上的外表面22。也可以在主体层740和弹性的片状部件78之间加入一层加强层(未示出)来加强主体层740。
图8是本发明的一种备选的隔离收口结构的剖视图。如图8所示,隔离收口810的翼部由隔离层88的直立部分892构成。隔离收口810具有一个近侧边895和一个远侧边812。近侧边895接合在主体层840上形成密封,防止***物从腿部开口的侧面渗出或漏出。通过将隔离层88的一部分围绕着弹性的间隔部件94折向自身,形成远侧边812。弹性的间隔部件94以可弹性地收缩的状态接合在隔离层88的翼部上的靠近所述远侧边812的部位上,使远侧边812离开主层812并直立起来。一个密封层814接合在隔离层88的翼部上。密封部件814最好是一种不能透过液体的薄膜,以进一步防止***物通过隔离收口810泄漏。密封层814最好是由一种聚乙烯薄膜制成。密封层814最好是从在横向上稍稍伸到近侧边895之外的部位延伸到居于近侧边895和远侧边812之间的部件上。在图8所示的实施例中,密封层位于翼部的折叠部分之间。密封层814伸到近侧边895之外,在近侧边895处进一步构成不可透过的密封。密封层814最好是不伸到远侧边812上(在该实施例中,离远侧边大约6.35mm(约0.25in)),以便在远侧边812附近形成一个可透气的部分,以保证皮肤的健康。因此,在隔离收口810的根部,液体和气体是不能透过的,但在隔离收口810的远侧边812附近,液体和气体是可以透过的,以提高隔离收口810的柔软性和透气性。
通过一个以可伸缩的状态在所述的近侧边和所述的远侧边的中间接合在所述的翼部的第二弹性间隔部件894形成一个第二“隔离”,第二弹性间隔部件894最好与弹性的间隔部件94相距至少12.5mm(大约0.5in)。第二弹性间隔部件894最好是在翼部和密封层814之间接合在翼部上。由于密封层最可取的是在几个间隔开的区域(与近侧边895相邻和与翼部的对折部分相邻)接合在翼部上,所以密封层的一个中间部分不被固定在翼部上,第二弹性间隔部件894最好是接合在翼部的与该中间部分相邻的部位上,使第二弹性间隔部件趋向于将翼部与密封层814隔开,形成一个口袋。由于只有非织造的翼部贴着身体,因此第二弹性间隔部件894为翼部提供了一个靠近身体的更为透气的部分。第二弹性间隔部件894最好是以比弹性的间隔部件94的力小一些的力可伸缩地接合在翼部上,以便不影响弹性的间隔部件94的功能,但又能将翼部与密封层814隔开。第二弹性间隔部件894最好是仅在其端部附近以一种可以弹性收缩的状态接合、最好是固定在翼部上,使其中间一部分不固定在翼部上(即,以如被本文引作参考文献的、1989年3月28日授予Richardson的名称为“Disposable Diaper Having An Improved Leg ConformingCuff”的美国第4816025号专利所述的方式形成一种拉绳似的弹性。),使第二弹性间隔部件894在翼部中的由翼部和密封层限定的空间中是悬浮着的,这样便将透气的非织造翼部与密封层隔开并与身体接触,从而使尿布更柔软、更透气并且能保护皮肤。
作为上述隔离收口实施例的另一个优选实施例,隔离收口的收口高度和间隔可以通过改变隔离收口接合在曳拉型尿布上的方式来调节。图8A示出怎样将隔离收口接合在顶片80上来使收口高度和间隔达到最佳化。用第一封闭件816在翼部的端部从其近侧边沿横向向内在大约收口高度的一半的部位上(与第二弹性间隔部件894相邻)将翼部的内表面接合在尿布上,最好是接合在顶片80上。然后将远侧边812沿横向向外折回到近侧边,形成一个第一隔离段820和一个第二隔离段822。在翼部的端部用一个第二间隔部件818将翼部的处在第二隔离段822中的外表面接合到翼部的处在第一隔离段820中的外表面上。通过折叠,在裆区30形成了一个更宽的收口空间和更高的收口高度,有效地改善了防泄漏性能(尤其是BM密封)。值得注意的是,可以通过改变第二封闭件818在各段中的位置来改变收口高度和收口间隔。由于穿用者的脚有可能被套在隔离收口中,因此隔离收口有可能会引起穿时的困难,所以收口高度对于曳拉型短裤来说是一个至关重要的参数。收口高度最好是小于大约44.5mm(大约1.75in),更可取的是在大约31.75mm至大约44.5mm(大约1.25in至大约1.75in)之间,而收口在裆区30的间隔在大约63.5mm(大约2.5in)至大约90mm(大约3.5in)之间。
图9示出本发明的一个备选实施例,在该实施例中,在侧片中开了一些孔54,并且在各腰带片中,一部分主体层940被去除了。将主体层的这个部分去除是为了加强在腰带片60和60′中的透气性能。这样,在腰带片中的围带包括各自的围带层(第一围带层42或第二围带层44),顶片80的主层86,以及在某些段中还包括整体的腰罩/腰带82。由于围带层和顶片的主层最好都由非织造的网面制成,使水蒸汽能够在曳拉型尿布的内部和外部之间通过,因此加强了曳拉型尿布的总体透气性。孔54与前面描述过的那些孔相似,它们加强了侧片的透气性。
图10表示本发明的曳拉型尿布的另一个备选实施例。主体层1040也起围带层的作用。主体层1040也构成曳拉型尿布1020在前区、后区和裆区中的外表面22。在该实施例中,主体层1040最好是由非织造的网面制成以便使曳拉型尿布具有布制短裤的手感和外观。顶片由一个主层86和一对隔离层88构成。在该实施例中,曳拉型尿布1020具有一个复合式底片,它既是吸湿芯84的底片又是侧片中的拉伸叠层的加强层。在该实施例中,底片由一个中底片层1002和一对底片加强层1004组成。中底片层1004最好是一种不能透过液体的薄膜,以便将***物保持在吸湿芯84中。但是,由于中底片层1002不必是受过机械拉伸的,所以它可以由一种前面描述过的不透液但透蒸汽的薄膜制成,使整个尿布在裆区和在前区和后区的中片中都是透气的。由于底片的加强片1004要受到机械拉伸,所以它最好是由前面描述过的任何一种适合于用作加强层的材料制成,包括非织造的网面或弹性薄膜。在图示的实施例中,底片的加强层1004由一种塑料薄膜制成。如用于图1-4所示实施例的主体层的薄膜。尽管最好是将底片的加强层叠合在中底片层上、最好是接合在中底片层上,但也可以将底片的加强层与中底片层在横向上隔开并且不固定在中底片层上,使底片的加强层成为独立的加强层。由于中底片层1002和底片的加强层1004最好各由一塑料薄膜制成,所以在将这些层组合到曳拉型尿布中以前可以先将它们接合在一起,以便在生产过程中易于处理。最好是将弹性的片状部件78放在主体层1040和底片的加强层1004之间,以形成拉伸叠层。
尽管已说明并描述了本发明的几个具体实施例,但本领域的技术人员应该明白,在不背离本发明的精神和范围的前提下还可以有各种其它的变化和改进。因此,在本发明范围内的所有这样的变化和改进都将覆盖在权利要求中。
Claims (12)
1、一种整体型的一次性曳拉型短裤,包括:
(a)一个主体层,该主体层具有一个内表面和一个外表面,所述的主体层由一个连续的薄片构成,该薄片限定了
(i)一个前区,该前区具有一个底边,一对侧边,一对腿边,一个包括腰带片和中间片的中片,两个从所述的中片横向外伸的侧片,以及从每个所述的侧片沿横向向外延伸到所述侧边的接缝片,所述的接缝片和所述的侧片在纵向上从所述的底边延伸到所述的腿边;
(ii)一个与所述的前区相对的后区,该后区具有一个底边,一对侧边,一对腿边,一个包括腰带片和中间片的中片,两个从所述的中片横向外伸的侧片,以及从每个所述的侧片沿横向向外延伸到所述侧边的接缝片,所述的接缝片和所述的侧片在纵向上从所述的底边延伸到所述的腿边;以及
(iii)一个位于所述的前区和所述的后区之间的裆区;
其特征在于,
(b)一个第一围带层在横向上从至少一个所述的侧片横跨所述的前区连续地延伸到另一个所述的侧片,所述的第一围带层接合在所述的主体层上;
(c)一个第二围带层在横向上从至少一个所述的侧片横跨所述的后区连续地延伸到另一个所述的侧片,所述的第二围带层接合在所述的主体层上;
(d)一个可弹性地伸长的前拉伸叠层位于所述前区的各所述侧片中,各所述前拉伸叠层由在所述侧片中的所述主体层的一部分、在所述侧片中的所述第一围带层的一部分、以及一个以可伸缩的状态接合在所述主体层或所述第一围带层上的弹性片状部件构成,其中所述的弹性片状部件各自位于所述主体层和所述第一围带层之间,各所述的前拉伸叠层至少在横向上是可以弹性地伸长的;
(e)一个可弹性地伸长的后拉伸叠层位于所述后区的各所述侧片中,各所述后拉伸叠层由在所述侧片中的所述主体层的一部分、在所述侧片中的所述第二围带层的一部分、以及一个以可伸缩的状态接合在所述主体层或所述第二围带层上的弹性片状部件构成,其中所述的弹性片状部件各自位于所述主体层和所述第二围带层之间,各所述的后拉伸叠层至少在横向上是可以弹性地伸长的;以及
(f)一对接缝在靠近所述接缝片的所述侧边处将所述前区接合到所述后区上,形成两个腿部开口和一个腰部开口。
2、如权利要求l所述的短裤,其中所述主体层由一种不能透过液体的薄膜制成,其中所述第一围带层和所述第二围带层最好是各由一种非织造网面制成,更可取的是所述第一围带层和所述第二围带层位于所述主体层的所述外表面上。
3、如权利要求2所述的短裤,还具有一个位于所述主体层的所述内表面上的吸湿芯,所述吸湿芯具有一个朝向所述内表面的短裤表面和一个与所述短裤表面相背的身体表面,所述短裤还包括一个位于所述吸湿芯的所述身体表面上的可以透过液体的顶片,所述顶片最好由一个位于所述吸湿芯的所述身体表面的至少一部分上的主层和一个从所述主层的各侧边横向外伸的隔离层组成,更可取的是所述主层是可以透过液体的,而各所述隔离层是疏水性的。
4、如权利要求l所述的短裤,其中所述的主体层由一种非织造网面制成,所述主体层最好是起到短裤顶片的作用,所述主体层具有一个内表面和一个外表面,更为可取的是所述第一围带层和所述第二围带层位于所述主体层的所述外表面上。
5、如权利要求4所述的短裤,还包括一个接合在所述的第一围带层和所述的第二围带层上的不能透过液体的中底片层,其中,(a)所述中底片层在所述前区中位于所述第一围带层和所述主体层之间,在所述后区中位于所述第二围带层和所述主体层之间,更可取的是该短裤还包括一个位于所述主体层和所述中底片层之间的吸湿芯;或者(b)所述第一围带层具有一个外表面和一个内表面,所述第二围带层具有一个外表面和一个内表面,所述中底片层在所述前区中位于所述第一围带层的所述外表面上,在所述后区中位于所述第二围带层的所述外表面上,更可取的是该短裤还具有一个吸湿芯,最可取的是所述吸湿芯(i)在所述前区中位于所述中底片层和所述第一围带层之间,在所述后区中位于所述中底片层和所述第二围带层之间,在所述裆区中位于所述中底片层和所述主体层之间,或者(ii)在所述前区中位于所述第一围带层和所述主体层之间,在所述后区中位于所述第二围带层和所述主体层之间,在所述裆区中位于所述中底片层和所述主体层之间。
6、如前面任何一个权利要求所述的短裤,还包括一个位于所述前区和所述后区的各所述侧片中的加强层,各所述加强层最好位于所述主体层和所述弹性片状部件之间。
7、如前面任何一个权利要求所述的短裤,还包括一个接合在所述前区的所述腰带片上的弹性腰片和一个接合在所述后区中的弹性腰片,各所述的弹性腰片至少在横向上是可以弹性地伸长的;各所述的弹性腰片最好以一种可以弹性地收缩的状态有效地接合,以使所述前区中的所述腰带片或所述后区中的所述腰带片收缩;更可取的是所述弹性腰片由一种整体的腰罩/腰带构成。
8、如前面任何一个权利要求所述的短裤,所述的裆区具有一个带有两条侧边的主片,一个腿部翼片从所述主片的各所述侧边横向外伸,该短裤还包括一个位于所述裆区的各所述腿部翼片上的弹性腿片,各所述的弹性腿片最好还包括一个隔离收口,该隔离收口包括:一个具有一个近侧边和一个远侧边的翼部,以及一个在所述远侧边附近以可伸缩的方式接合在所述翼部上的弹性的间隔部件;更可取的是所述的翼部由一种非织造的网面制成,并且各所述的隔离收口还包括一个接合在所述翼部上的密封层。
9、如权利要求8所述的短裤,其中所述的密封层在一些间隔开的区域上固定在所述翼部上,使所述密封层的中间部分不固定在所述翼部上,各所述的隔离收口还具有一个第二弹性间隔部件,所述第二弹性间隔部件在所述近侧边和所述远侧边的中间、靠近所述密封层的所述中间部分处与所述的翼部接合,使所述的翼部与所述的密封层隔开,所述的第二弹性间隔部件最好是只在其端部附近接合在所述翼部上,使所述第二弹性间隔部件的一个中间部分不接合在所述的翼部上,而是悬在所述的翼部中;更可取的是所述隔离收口的各所述翼部具有两个端部,一个内表面,和一个外表面,各所述的隔离收口还具有一个用于将所述翼部的所述内表面接合在所述短裤的位于所述近侧边的横向内侧的所述端部上的第一封闭件,一条位于所述第一封闭件旁边的折痕,使所述远侧边被横向外折,形成一个第一隔离段和一个第二隔离段,还具有一个用于在两端将所述第二隔离段中的所述翼部的所述外表面接合在所述第一隔离段中的所述外表面上的第二封闭件;最可取的是所述密封层从所述近侧边延伸到位于所述近侧边和所述远侧边之间的一个点上,使所述隔离收口与所述远侧边相邻的部分是可透气的。
10、如前面任何一个权利要求所述的短裤,其中所述前区的所述中间片和所述后区的所述中间是可以弹性伸长的,但不收缩在一起。
11、一种整体型的一次性曳拉型短裤,其特征在于,该短裤包括:
(a)一个主体层,该主体层由一个连续的薄片构成,该薄片限定了
(i)一个前区,该前区具有一个底边,一对侧边,一对腿边,一个包括腰带片和中间片的中片,两个从所述的中片横向外伸的侧片,以及从每个所述的侧片沿横向向外延伸到所述侧边的接缝片,所述的接缝片和所述的侧片在纵向上从所述的底边延伸到所述的腿边;
(ii)一个与所述的前区相对的后区,该后区具有一个底边,一对侧边,一对腿边,一个包括腰带片和中间片的中片,两个从所述的中片横向外伸的侧片,以及从每个所述的侧片沿横向向外延伸到所述侧边的接缝片,所述的接缝片和所述的侧片在纵向上从所述的底边延伸到所述的腿边;以及
(iii)一个位于所述的前区和所述的后区之间的裆区;
所述的主体层具有一个外表面和一个内表面,并且由一种非织造网面制成;
(b)一个位于所述主体层的所述内表面上的底片,所述底片具有一个与所述主体层的所述内表面相贴的外表面和一个与所述外表面相背的内表面,所述底片包括一个中底片层和一个在各侧片中位于所述中底片层的横向外侧的底片加强层,各所述的底片加强层最好是接合在所述中底片层上,更可取的是所述的中底片层是不能透过液体但可以透过蒸汽的;
(c)一个位于所述底片的所述内表面上的可以透过液体的顶片,所述的顶片最好包括一个主层和一个从所述主层的各侧边横向外伸的隔离层;
(d)一个可弹性地伸长的前拉伸叠层,位于所述前区的各所述侧片中,各所述前拉伸叠层由在所述侧片中的所述主体层的一部分、在所述侧片中的所述底片加强层的一部分、在所述侧片中的所述顶片的一部分、以及一个接合在所述主体层上的弹性片状部件组成,其中所述的弹性片状部件最好位于所述主体层和所述底片加强层之间,各所述的前拉伸叠层至少在横向上是可以弹性地伸长的;
(e)一个可弹性地伸长的后拉伸叠层,位于所述后区的各所述侧片中,各所述后拉伸叠层由在所述侧片中的所述主体层的一部分、在所述侧片中的所述底片加强层的一部分、在所述侧片中的所述顶片的一部分、以及一个接合在所述主体层上的弹性片状部件组成,其中所述的弹性片状部件位于所述主体层和所述底片加强层之间,各所述的后拉伸叠层至少在横向上是可以弹性地伸长的;以及
(f)一对接缝,这对接缝在靠近所述接缝片的所述侧边处将所述前区接合到所述后区上,形成两个腿部开口和一个腰部开口。
12、一种一次性曳拉型短裤,包括:
(a)一个围带,具有
(i)一个前区,具有
一个中片,该中片有一个腰带片和一个中间片,所述中间片是不收拢的,所述腰带片最好是可弹性伸长的,更可取的是可弹性收缩的;
一个位于所述中片的两侧的侧片,各所述侧片至少在横向上是可以弹性地伸长的;以及
一个从各侧片横向外伸的接缝片;
(ii)一个后区,具有
一个中片,该中片有一个腰带片和一个中间片,所述中间片是不收拢的,所述腰带片最好是可弹性伸长的,更可取的是可弹性收缩的;
一个位于所述中片的两侧的侧片,各所述侧片至少在横向上是可以弹性地伸长的;以及
一个从各侧片横向外伸的接缝片;
(iii)一对接缝,将前区中的所述接缝片与后区中的相应的接缝片接合起来,使所述围带是连续的;
所述的围带包括:
一个横跨所述的前区连续地延伸的第一围带层,和
一个横跨所述的后区连续地延伸的第二围带层;
一个在所述前区的各所述侧片中以可伸缩的方式接合在所述的第一围带层上的弹性片状部件;
一个在所述后区的各所述侧片中以可伸缩的方式接合在所述的第二围带层上的弹性片状部件;
一个腰带,最好是在可以弹性收缩的状态下有效地接合在所述前区中的所述腰带片的所述第一围带层上,和
一个腰带,最好是在可以弹性收缩的状态下有效地接合在所述后区中的所述腰带片的所述第二围带层上;以及
(b)一个吸湿组件,该吸湿组件在所述的前区和所述的后区中接合在所述的围带上,形成一个贴合在穿用者的***的裆区,所述的吸湿组件包括一个外覆盖层和一个接合于外覆盖层上的吸湿芯。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/415,816 US5569234A (en) | 1995-04-03 | 1995-04-03 | Disposable pull-on pant |
US08/415,816 | 1995-04-03 |
Publications (1)
Publication Number | Publication Date |
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CN1183714A true CN1183714A (zh) | 1998-06-03 |
Family
ID=23647325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN96193802A Pending CN1183714A (zh) | 1995-04-03 | 1996-03-29 | 一次性曳拉型短裤 |
Country Status (24)
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US (4) | US5569234A (zh) |
EP (2) | EP0902674B1 (zh) |
JP (3) | JP2904934B2 (zh) |
KR (5) | KR100272078B1 (zh) |
CN (1) | CN1183714A (zh) |
AR (2) | AR001552A1 (zh) |
AT (1) | ATE213145T1 (zh) |
AU (2) | AU721731B2 (zh) |
BR (1) | BR9604800A (zh) |
CA (2) | CA2216640C (zh) |
CO (1) | CO4700385A1 (zh) |
CZ (1) | CZ312697A3 (zh) |
DE (2) | DE69619279T2 (zh) |
EG (1) | EG21212A (zh) |
ES (2) | ES2168469T3 (zh) |
HU (1) | HUP9801605A3 (zh) |
ID (2) | ID24577A (zh) |
MX (2) | MX9707582A (zh) |
NO (1) | NO974541L (zh) |
PE (1) | PE5098A1 (zh) |
TR (1) | TR199701095T1 (zh) |
TW (1) | TW319689B (zh) |
WO (2) | WO1996031178A2 (zh) |
ZA (1) | ZA962691B (zh) |
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-
1995
- 1995-04-03 US US08/415,816 patent/US5569234A/en not_active Expired - Lifetime
-
1996
- 1996-03-29 DE DE69619279T patent/DE69619279T2/de not_active Expired - Lifetime
- 1996-03-29 CZ CZ973126A patent/CZ312697A3/cs unknown
- 1996-03-29 WO PCT/US1996/004303 patent/WO1996031178A2/en active IP Right Grant
- 1996-03-29 ES ES96909888T patent/ES2168469T3/es not_active Expired - Lifetime
- 1996-03-29 KR KR1019997012314A patent/KR100272078B1/ko not_active IP Right Cessation
- 1996-03-29 JP JP8530387A patent/JP2904934B2/ja not_active Expired - Fee Related
- 1996-03-29 CN CN96193802A patent/CN1183714A/zh active Pending
- 1996-03-29 MX MX9707582A patent/MX9707582A/es not_active IP Right Cessation
- 1996-03-29 HU HU9801605A patent/HUP9801605A3/hu unknown
- 1996-03-29 AU AU53253/96A patent/AU721731B2/en not_active Ceased
- 1996-03-29 KR KR1019970706956A patent/KR100263229B1/ko not_active IP Right Cessation
- 1996-03-29 AT AT96909888T patent/ATE213145T1/de not_active IP Right Cessation
- 1996-03-29 CA CA002216640A patent/CA2216640C/en not_active Expired - Fee Related
- 1996-03-29 EP EP96909888A patent/EP0902674B1/en not_active Expired - Lifetime
- 1996-03-29 BR BR9604800A patent/BR9604800A/pt not_active IP Right Cessation
- 1996-03-29 TR TR97/01095T patent/TR199701095T1/xx unknown
- 1996-04-02 CO CO96016239A patent/CO4700385A1/es unknown
- 1996-04-02 PE PE1996000237A patent/PE5098A1/es not_active Application Discontinuation
- 1996-04-03 WO PCT/US1996/004527 patent/WO1996031179A2/en not_active Application Discontinuation
- 1996-04-03 DE DE69622028T patent/DE69622028T2/de not_active Revoked
- 1996-04-03 KR KR1019970706955A patent/KR100263228B1/ko not_active IP Right Cessation
- 1996-04-03 EP EP96910708A patent/EP0818980B1/en not_active Revoked
- 1996-04-03 ZA ZA962691A patent/ZA962691B/xx unknown
- 1996-04-03 CA CA002216145A patent/CA2216145C/en not_active Expired - Lifetime
- 1996-04-03 EG EG29096A patent/EG21212A/xx active
- 1996-04-03 JP JP53043196A patent/JP3782111B2/ja not_active Expired - Lifetime
- 1996-04-03 ES ES96910708T patent/ES2175085T3/es not_active Expired - Lifetime
- 1996-04-03 ID IDP20000363D patent/ID24577A/id unknown
- 1996-04-03 AU AU53829/96A patent/AU5382996A/en not_active Abandoned
- 1996-04-03 AR AR33605396A patent/AR001552A1/es unknown
- 1996-06-13 TW TW085107086A patent/TW319689B/zh active
- 1996-09-12 US US08/713,054 patent/US5836932A/en not_active Expired - Lifetime
- 1996-10-25 US US08/738,136 patent/US5769838A/en not_active Expired - Lifetime
- 1996-11-14 ID IDP20000362D patent/ID25774A/id unknown
-
1997
- 1997-03-20 AR ARP970101116A patent/AR006329A1/es not_active Application Discontinuation
- 1997-10-01 NO NO974541A patent/NO974541L/no unknown
- 1997-10-02 MX MX9707581A patent/MX9707581A/es unknown
-
1998
- 1998-11-16 US US09/192,610 patent/US6258077B1/en not_active Expired - Lifetime
-
1999
- 1999-12-24 KR KR1019997012315A patent/KR100266497B1/ko not_active IP Right Cessation
- 1999-12-24 KR KR1019997012316A patent/KR100266498B1/ko not_active IP Right Cessation
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2001
- 2001-04-03 JP JP2001105111A patent/JP2001353181A/ja not_active Withdrawn
Cited By (8)
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CN1297244C (zh) * | 1999-03-10 | 2007-01-31 | 花王株式会社 | 吸收性物品 |
CN101141939B (zh) * | 2005-03-18 | 2011-06-15 | 宝洁公司 | 带有信息图象的套穿型可穿着制品 |
CN103501742A (zh) * | 2011-04-29 | 2014-01-08 | 宝洁公司 | 具有窄聚合物膜和不透明度加强补片的吸收制品 |
CN103501742B (zh) * | 2011-04-29 | 2016-06-29 | 宝洁公司 | 具有窄聚合物膜和不透明度加强补片的吸收制品 |
CN106038082A (zh) * | 2011-04-29 | 2016-10-26 | 宝洁公司 | 具有窄聚合物膜和不透明度加强补片的吸收制品 |
CN106794083A (zh) * | 2014-10-09 | 2017-05-31 | 宝洁公司 | 成人一次性吸收制品和系列的长度对腰部轮廓和髋部对侧部轮廓 |
CN107205870A (zh) * | 2015-02-09 | 2017-09-26 | Sca卫生用品公司 | 裤型吸收制品 |
CN113473954A (zh) * | 2019-02-14 | 2021-10-01 | 宝洁公司 | 裤型可穿着制品 |
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