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CN107672284A - 用于制造复合弹性带的方法 - Google Patents

用于制造复合弹性带的方法 Download PDF

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Publication number
CN107672284A
CN107672284A CN201710644397.1A CN201710644397A CN107672284A CN 107672284 A CN107672284 A CN 107672284A CN 201710644397 A CN201710644397 A CN 201710644397A CN 107672284 A CN107672284 A CN 107672284A
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sheet material
elastomeric material
along
elastic band
fibrous
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圭多·博内利
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Fameccanica Data SpA
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    • A61F13/00—Bandages or dressings; Absorbent pads
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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
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  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Textile Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Laminated Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Organic Insulating Materials (AREA)
  • Adhesive Tapes (AREA)

Abstract

一种用于制造复合弹性带(10)的方法，包括以下步骤：提供弹性材料(12)，所述弹性材料(12)的沿一方向(Y)的最大弹性延长量(Emax)在600％到1500％之间、优选地在700％到1200％之间、更优选地在800％到1000％之间；沿所述方向(Y)以在所述最大弹性延长量(Emax)的10％到50％之间、优选地在10％到30％之间的延长值来弹性式拉伸所述弹性材料(12)；提供至少一个纤维材料的片材(14,16)；将以所述延长值延长的所述弹性材料(12)附接到处于非变形状态下的所述至少一个纤维材料的片材(14,16)上。

Description

用于制造复合弹性带的方法
技术领域
本发明涉及用于制造复合弹性带的方法，该复合弹性带能沿着至少一个方向(例如，垂直于卷材的纵向轴线的方向)弹性式延伸。
本发明特别针对制造欲被设置到腰部区域、例如用于形成一次性的吸收式卫生用品的侧板的复合弹性带而被提出。然而，本发明的范围不受限于这可行的应用领域。
背景技术
能以内裤的形式被穿戴的一次性的吸收式卫生用品(例如，婴儿用的尿布或成人用的吸收式卫生用品)通常可由以下设置来形成，即：两个连续的复合带在横向方向上彼此间隔开且沿纵向方向前进，在这两个连续的复合带之间附接有相对于纵向方向横向地设置的吸收芯。复合带形成吸收式卫生用品的前腰部区域和后腰部区域。腰部区域通常设置有弹性卷材，以使该吸收式用品能与穿戴者的身体更好地贴合。
用于制造用于吸收式卫生用品的复合弹性带的统一技术为：使处于例如沿相对于前进方向的横向方向的弹性式延长状态的连续的弹性材料沿纵向方向前进；在该弹性材料的相反两侧上设置两个无纺卷材。无纺卷材的片材和弹性材料通过焊接图案或借由粘合剂而附接在一起。当使弹性材料保持在延长状态中的张力被释放时，无纺卷材蜷曲，并呈现有褶的形状。通常，这种制造技术包含：在附接无纺卷材之前以所选择的延长值来进行弹性材料的延长。通常，弹性材料被拉伸到例如为200％的延长值。在由同一申请人提出的EP 1355 604B1中描述了用于制造复合弹性带的这种技术的一个例子，其描述了包含以下内容的一种方法：选择第一材料和第二材料，该第一材料和第二材料可以通过超声波焊接而被焊接在一起；选择弹性材料，并将其设置到第一材料和第二材料之间，以形成分层结构；通过超声波焊接将第一材料和第二材料连接在一起，其中在多个焊接点处，弹性材料被包含在第一材料和第二材料之间。
这种技术的主要缺陷在于，弹性材料在被拉伸到高延长值(例如，接近最大延长)时会承受永久的屈服和变形，从而当产生材料的延长的张力中断时，该弹性材料不会回到原始的非变形状态(滞后作用)。这导致材料的弹性延长能力损失和该材料的弹性变差。
根据一种已知的替代技术，在两个无纺织物的片材处于放松状态(即，未相对于其静止状态而弹性式延长)时，通过粘着剂、或者作为备选地在焊接点处，将该弹性材料连接到两个无纺织物的片材上。这样形成的复合弹性带应当随后经受机械式激活步骤，以便获得弹性延展特性。该机械激活步骤通常包含沿横向方向拉伸，这导致两个无纺织物的片材永久变形。弹性材料随后回到静止状态，这通常会使两个无纺织物的片材形成褶皱，至少在无纺织物的片材例如在焊接点之间未被焊接在一起的部分处形成褶皱，这是因为两个无纺织物的片材承受了沿拉伸方向的永久的延长变形。在机械式激活步骤之后，复合弹性带能沿拉伸方向弹性式延伸。该机械式激活步骤可沿着生产线进行，或在以后的阶段中进行。例如，机械式激活步骤可由使用者通过使复合弹性带(已经被施加到吸收式卫生用品上)受到拉伸来实现。该第二个技术的缺陷在于，由此得到的复合物的最大弹性延长能力通常不能超过250％，在超过该值的情况下，无纺织物会变形成致使其失去自身的完整性。
发明内容
本发明的目的在于提出一种用于制造能弹性式延伸的复合弹性带的方法，该复合弹性带不受现有技术中的问题的影响。
根据本发明，该目的可通过以下方法来实现。本发明提出了一种用于制造复合弹性带的方法，包括以下步骤：提供弹性材料，所述弹性材料的沿一方向的最大弹性延长量在600％到1500％之间、优选地在700％到1200％之间、更优选地在800％到1000％之间；沿所述方向以在所述最大弹性延长量的10％到50％之间、优选地在10％到30％之间的延长值来弹性式拉伸所述弹性材料；提供至少一个纤维材料的片材；将以所述延长值延长的所述弹性材料附接到处于非变形状态下的所述至少一个纤维材料的片材上。
优选地，该方法包括以下步骤：提供两个纤维材料的片材，并且将以所述延长值延长的所述弹性材料附接到处于非变形状态中的所述两个纤维材料的片材之间。
优选地，所述至少一个纤维材料的片材具有根据EDANA方法no.WSP 110.4(09)选项B所测得的大于200％的沿所述方向的永久变形量。
优选地，所述两个纤维材料的片材具有根据EDANA方法no.WSP 110.4(09)选项B所测得的大于200％的沿所述方向的永久变形量。
优选地，该方法包括以下步骤：在将连续的弹性材料附接到所述至少一个纤维材料的片材上的步骤之后，沿所述方向拉伸所述复合弹性带，以使得所述至少一个纤维材料的片材的永久变形量大于200％。
优选地，所述方向为横向于所述复合弹性带的纵向轴线的方向。
权利要求书形成在这里相对于本发明提出的说明书的组成部分。
附图说明
下面将参照附图对本发明进行详细描述，这些附图仅作为非限制实施例给出，其中：
图1显示了处于放松状态下的复合弹性带的示意性截面图；
图2显示了用于制造图1所示的复合弹性带的设备的示意性立体图。
具体实施方式
参照图1，附图标记10指示了能沿横向方向Y弹性式延伸的复合弹性带。复合弹性带10包括在两个纤维片材14、16之间沿横向方向Y延长的弹性材料12。纤维片材14、16和弹性材料12通过多个焊接点18来彼此附接。焊接可通过热焊接或超声波焊接来实现。作为备选，形成复合弹性带10的片材可通过粘着剂粘在一起。焊接点18可在纵向方向X和横向方向Y上间隔开，以形成焊接图案。焊接点18可形成开口，以在复合弹性带10上形成透气通道，例如如同一申请人在文件EP 1 355 604中所描述的那样。
总的来说可以认为，足以将两个纤维片材14、16焊接在一起的超声波焊接的水平也能在介于它们之间的弹性材料12上设置开口。通过这种方式，借由复合弹性带10的牢固的锚定和透气通道的形成，第一纤维片材14和第二纤维片材16通过限制中间的弹性材料12的开口而被焊接在一起。在由同一申请人提出的IT 102016000032926中描述了用于形成带有透气开口的复合弹性带的超声波焊接系统。
第一纤维片材14和第二纤维片材16可由在一次性的吸收式卫生用品的领域中已知的透气且一般能彼此焊接(通常通过超声波焊接)的材料制成。典型的材料可以是包含合成纤维(例如，聚乙烯、聚丙烯、聚酯，或者这些纤维的双组份纤维或它们的组合)和天然纤维(例如，棉、人造丝或粘胶纤维)的无纺纤维材料。例如，纤维片材14、16可由无纺的粗疏或短的纤维或纺粘型织物制成，并可用于第一纤维片材14和第二纤维片材16。
在根据本发明的方法中，所选择的纤维片材14、16为能在沿所需要的方向(例如，横向)受到10N/50mm的负载时具有大于200％的永久延长(由EDANA方法n.WSP 110.4(09)选项B所确定)的那些。具体来说，在图1所示的实施方案中，纤维片材14、16能相对于机器方向横向地延伸。
例如，可使用能横向地延伸的无纺卷材，例如由Sandler AG所制造的Sawatex11311D/52或Sawasoft 2628，或者由Jacob Holm所制造的SoftLite SAP 12.015.005。
弹性材料12可由膜或沿基本上正交于延伸方向(例如沿图2的实施方案中的能横向地延伸的弹性材料的纵向方向)的方向间隔开的多个卷材形成。举例来说，能横向地延伸且由一系列不连续的卷材形成的弹性材料能由EP 2260813 B1中所描述的设备来制造。可从一次性的吸收式卫生用品的领域内已知的材料中选择弹性材料12。适当的材料可以是基于热塑性弹性体聚合物(例如，弹性聚烯烃(PE、PP)、苯乙烯嵌段共聚物(SIS、SBS、SEBS)或热塑性聚氨酯)的膜。在根据本发明的方法的应用中，弹性材料优选地被选择成具有根据ASTM D-882方法确定的在600％到1500％之间、优选地在700％到1200％之间、更优选地在800％到1000％之间的最大弹性延长量。
例如，弹性膜可使用由Tredegar Film Products Italia s.r.l.制成的代码为x36433和x38495的、在横向方向上具有大于900％的最大弹性延长量的材料。
在复合弹性带10的制造方法中，第一纤维片材14和第二纤维片材16以及弹性材料12以收在卷筒上的连续卷材的形式来提供。
图2示意性地显示了用于制造复合弹性带10的方法的步骤。第一纤维片材14和第二纤维片材16从相应的卷筒20、22上以相同的速度V1供给。连续的弹性材料12从卷筒24上供给。连续的弹性材料12沿着纵向方向供给，并随后沿着横向于所选择的方向的方向(例如，如图2所示沿着垂直于连续的弹性材料12的前进方向的横向方向Y)张紧。弹性材料12的张紧在最大弹性延长量的10％到50％之间，优选地在10％到30％之间。例如，如果材料的最大弹性延长量大约为900％，那么弹性材料12在相对于放松状态处于100％到300％之间的横向延长状态中前进。
连续的或带状的弹性材料的横向张紧可通过已知的设备、例如通过在WO2009/133508中所描述的类型的张紧设备26来实现，该张紧设备包括两个盘28，其中这两个盘的各自的旋转轴线相对于横向方向Y倾斜。张紧设备28使弹性材料12沿横向方向Y从宽度L’延伸到宽度L”。在张紧设备26的下游处，通过抽吸输送带30使弹性材料12保持处于张紧状态。
当第一纤维片材14和第二纤维片材16在非变形状态下沿着方向A前进时，连续的弹性材料12(处于弹性式延长状态中)被设置到第一纤维片材14和第二纤维片材16之间。由两个纤维片材14、16和连续的弹性材料12形成的分层结构被送至焊接单元32处，该焊接单元32包括砧辊34和与该砧辊34配合的超声波焊接头36。砧辊34具有圆柱形的配对表面，该配对表面设置有带有头部表面的凸齿，该头部表面形成与超声波焊接头的超声波发生器36相配合的相对焊接表面。砧辊34的凸齿可在平行的横向阵列中彼此偏移地对齐。通过在从砧辊34处凸出的齿的头部表面上的第一纤维材料14和第二纤维材料16的超声波焊接，焊接头36将分层结构的各构件焊接在一起。在纤维片材14、16未变形，且弹性材料12处于相对于静止状态的延长状态中时，连续的弹性材料12被锚定到两个纤维片材14、16上。在焊接单元32的下游处，由此形成的复合弹性带10以速度V1前进。
复合弹性带10的机械式激活步骤可被设置在焊接单元21的下游处。会导致纤维片材14、16永久性延长的任何机械式激活过程都可由直接沿着生产线的已知的方法来实现，由在焊接单元之后设置拉伸单元来实现，或者随后例如由使用者借由拉伸包含复合弹性带10的吸收式卫生用品来实现。
当然，在不破坏本发明的原则的情况下，结构和实施方案的细节可相对于所描述和显示的那些广泛地变化，而不会由此背离由随附的权利要求书所限定的本发明的范围。

Claims (6)

1.一种用于制造复合弹性带(10)的方法，包括以下步骤：
提供弹性材料(12)，所述弹性材料(12)的沿一方向(Y)的最大弹性延长量(Emax)在600％到1500％之间、优选地在700％到1200％之间、更优选地在800％到1000％之间，
沿所述方向(Y)以在所述最大弹性延长量(Emax)的10％到50％之间、优选地在10％到30％之间的延长值来弹性式拉伸所述弹性材料(12)，
提供至少一个纤维材料的片材(14,16)，
将以所述延长值延长的所述弹性材料(12)附接到处于非变形状态下的所述至少一个纤维材料的片材(14,16)上。
2.根据权利要求1所述的方法，其特征在于，包括以下步骤：提供两个纤维材料的片材(14,16)，并且将以所述延长值延长的所述弹性材料(12)附接到处于非变形状态中的所述两个纤维材料的片材(14,16)之间。
3.根据权利要求1所述的方法，其特征在于，所述至少一个纤维材料的片材(14,16)具有根据EDANA方法no.WSP 110.4(09)选项B所测得的大于200％的沿所述方向(Y)的永久变形量。
4.根据权利要求2所述的方法，其特征在于，所述两个纤维材料的片材(14,16)具有根据EDANA方法no.WSP 110.4(09)选项B所测得的大于200％的沿所述方向(Y)的永久变形量。
5.根据上述权利要求中任一项所述的方法，其特征在于，包括以下步骤：在将连续的弹性材料(12)附接到所述至少一个纤维材料的片材(14,16)上的步骤之后，沿所述方向(Y)拉伸所述复合弹性带(10)，以使得所述至少一个纤维材料的片材(14,16)的永久变形量大于200％。
6.根据上述权利要求中任一项所述的方法，其特征在于，所述方向(Y)为横向于所述复合弹性带(10)的纵向轴线(X)的方向。
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