CN101641469B - 由原纤化双组分海岛纤维生产的高强耐用微米和纳米纤维织物 - Google Patents

由原纤化双组分海岛纤维生产的高强耐用微米和纳米纤维织物 Download PDF

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CN101641469B
CN101641469B CN2006800228045A CN200680022804A CN101641469B CN 101641469 B CN101641469 B CN 101641469B CN 2006800228045 A CN2006800228045 A CN 2006800228045A CN 200680022804 A CN200680022804 A CN 200680022804A CN 101641469 B CN101641469 B CN 101641469B
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贝南·普尔迪希米
纳塔利娅·V·弗多罗瓦
斯蒂芬·R·夏普
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Abstract

本文公开的主题一般而言涉及由微旦尼尔纤维构成的织物，其中所述纤维形成为微双组分原纤化纤维。能量足以原纤化以及缠结(粘合)纤维。这些织物可以是机织或针织的，由双组分海岛纤维和长丝制成，或可以是非织造织物，通过纺粘或通过使用双组分短纤维形成，所述短纤维通过几种方式中的任一种形成为纤维网并以类似于纺粘长丝纤维网所使用的方式粘合。

Description

由原纤化双组分海岛纤维生产的高强耐用微米和纳米纤维织物
优先权
该专利申请要求2005年6月24日提交的美国临时专利申请No.60/694,121的优先权。
技术领域
本发明一般涉及微旦尼尔纤维和用该纤维生产的高强度非织造产品的制造方法。更具体地，本发明涉及从海岛构型生产该纤维，其中海组分由岛组分原纤化而成。
背景技术
纺粘型非织造织物用于许多应用，并且构成在北美生产或使用的大多数产品。几乎所有这些应用都要求轻质的一次性织物。因此，大多数纺粘型织物设计用于单一用途，以及设计为具有足够的性能以用于它们被期望的应用。纺粘法指的是纤维(长丝)被挤出、冷却和拉伸，然后在传送带上收集而形成织物的方法。如此收集的纤维网未被粘合，并且长丝必须通过热、机械或化学方法粘合在一起来形成织物。热粘法是目前为止最有效和最经济的形成织物的方法。水刺法不是这么有效，但是生产出比热粘织物柔软得多并且通常更结实的织物。
微旦尼尔纤维是小于1旦尼尔的纤维。通常，利用分裂的双组分纤维生产微旦尼尔纤维。图1示出最有名的裂离型纤维类型，其通常被称作“扇形楔(pie wedge)”或“扇形嵌段(segmented pie)”。美国专利No.5,783,503示出典型的不经过机械处理的分裂的熔纺多组分热塑性连续长丝。在所述的构型中，期望提供中空的芯长丝。中空芯防止类似组分的楔形尖端在长丝中央相互接触，并促进长丝组分的分离。
在这些构型中，组分是通常由尼龙和聚酯制成的扇形体(segment)。这种纤维通常具有16个扇形体。支持该纤维的传统技术是通过梳理和/或气流成网形成每根长丝纤维通常为2～3旦尼尔的纤维网，然后通过对所述纤维网进行高压喷水在一个步骤中分裂纤维并将其粘合成织物。所形成的织物将由微旦尼尔纤维构成，并将拥有微旦尼尔织物在柔性度、悬垂性、紧度和表面积方面的所有特征。
在生产用于裂开的双组分纤维时，通常需要考虑纤维的几个特征以确保足以生产连续纤维。这些特征包括组分的可混性、熔点差异、结晶性质、粘度和产生摩擦电荷的能力。通常对所选的共聚物进行处理以确保双组分纤维之间的这些特征适于使得可以纺出多组分长丝。合适的聚合物组合包括聚酯和聚丙烯、聚酯和聚乙烯、尼龙和聚丙烯、尼龙和聚乙烯、以及尼龙和聚酯。由于这些双组分纤维纺成扇形嵌段横断面，所以每种组分沿纤维的长度被暴露。因此，如果所选的组分没有非常类似的性质，则在生产期间连续纤维可能产生缺陷，例如断裂或卷曲。这些缺陷将使长丝不适于进一步加工。
美国专利No.6,448,462公开了另一种代表嵌段构型(pieconfiguration)的具有橘子状多嵌段结构的多组分长丝。该专利也公开了肩并肩(side-by-side)的构型。在这些构型中，两种不相容的聚合物如聚酯和聚乙烯或聚酰胺用于形成连续的多组分长丝。这些长丝经熔纺、拉伸和直接铺网形成非织造织物。现在，这种在纺粘工艺中结合水力分裂的技术的使用可通过Freudenberg以商标Evolon_销售的产品从商业途径获得，并用于上述许多相同的应用。
扇形嵌段只是许多可能的裂离型构型中的一种。实心形式更容易纺丝，但是中空形式更容易分裂。为确保分裂，使用不相似的聚合物。但是甚至在选择相互亲和力低的聚合物之后，纤维的横断面会影响到纤维将如何容易地分裂。最容易分裂的横断面是嵌段带状物，例如图2中所示。嵌段的数目必须为奇数，使两端为相同的聚合物，以“平衡”该结构。这种纤维是各向异性的，难于作为短纤维进行加工。然而，作为长丝，其性能良好。因此，在纺粘工艺中，这种纤维是引人注目的。改进了诸如尖端三叶形或嵌段交叉的纤维的加工。见图3。
使用扇形嵌段构型的另一个缺点是分裂时整个纤维形状是楔形。该构型是用于生产小的微旦尼尔纤维工艺的直接结果。因此，虽然适于它们的期望目的，但是可以期望产生有利的应用结果的其它纤维形状。目前在标准的嵌段工艺中尚不能得到这些形状。
因此，在利用扇形嵌段形式生产微旦尼尔纤维时，所用和可用材料的选择受到某些限制。虽然组分必须是足够不同的材料，因而组分之间的粘附被最小化而促进分离，但是它们在特征方面也必须足够相似，以使得能够在纺粘或熔喷工艺中生产纤维。如果材料足够不相似，则纤维在加工过程中会断裂。
制造微旦尼尔的另一种方法是使用海岛构型的纤维。美国专利No.6,455,156公开了一种该结构。在海岛构型中，主要纤维组分——海——用于包裹较小的内部纤维——岛。该结构容易生产，但是为了得到岛，需要除去海。这通过在不影响岛的溶液中溶解海来完成。该工艺不是环境友好的，因为使用需要废水处理的碱性溶液。此外，由于必须提取岛组分，所以该方法限制聚合物类型，所述聚合物类型可以使用是因为不受除海溶液的影响。
目前可在市场上购买这种海岛纤维。它们最常用于生产合成皮革和绒面革。在合成皮革的情况下，后续步骤将凝固的聚氨酯引入到织物中，并且也可包括外涂层。引起对于该纤维的诸多兴趣的另一个终端用途在于技术擦拭，其中小纤维导致大量小的毛细管，其产生更好的流体吸收能力和更好的灰尘吸附能力。因为相似的原因，该纤维可以有利地用于过滤。
总之，目前已经实现的技术具有有限的应用，因为在选择将允许容易地纺丝和对于嵌段纤维而言可分裂的聚合物时受到限制。纺丝是成问题的，因为两种聚合物都暴露在表面，以及由此产生的伸长粘度、骤冷性能和松弛的变化导致引起纺丝难题的各向异性。此外，现有技术的主要局限性在于纤维形成楔形并且就能够获得的纤维横断面来说，没有柔性。
海岛技术的优点在于如果喷丝头设计得当，则海可充当保护物来保护岛，以降低纺丝难题。但是，由于需要除去海，适用于海和岛组分的聚合物的可得性受到限制。迄今为止，除经过除去海组分之外，无法采用海岛技术来生产微旦尼尔纤维，因为普遍认为分离海中岛所需的能量在商业上不可行。
因此，需要能够以有助于纺粘加工的方式生产微旦尼尔纤维尺寸并且对环境无害的生产方法。
发明内容
根据本发明主题的一个实施方案，公开一种用于生产微旦尼尔织物的方法，其中双组分海岛纤维/长丝被原纤化，其中海岛保持与岛纤维的结合，形成高强度的非织造织物。
因此，本发明的一个目的是提供一种生产高表面积的微旦尼尔织物的方法；当结合附图进行如下的最佳描述时，其它目的将显而易见。
附图说明
下文将描述设计用于实施本发明的方法和系统及其其它特征。
阅读下文的具体说明并参照形成具体说明的一部分的附图，将会更容易理解本发明：
图1是典型的双组分扇形嵌段纤维的示意图，实心(左)和中空(右)；
图2是典型的嵌段带状纤维的示意图；
图3是典型的嵌段交叉和尖端三叶形纤维的示意图；
图4描述典型的双组分纺粘工艺；
图5显示利用鼓式交络器进行水刺的典型工艺；
图6显示所采用的双组分纤维-海岛型(左)和皮芯型(右)；
图7描述纺粘工艺生产的双组分纤维的实例；
图8显示纤维部分原纤化的I-S水刺纺粘织物表面的SEM显微照片；和
图9显示纤维完全原纤化的I-S水刺纺粘织物表面的SEM显微照片；
图10显示纤维完全原纤化的I-S水刺纺粘织物表面的SEM显微照片；
图11显示I-S水刺纺粘织物表面的SEM显微照片；
图12显示I-S水刺纺粘织物横断面的SEM显微照片；
图13显示纤维完全原纤化的I-S水刺纺粘织物表面的SEM显微照片；
图14显示原纤化之前I-S纺粘织物横断面的SEM显微照片；
图15显示水刺点粘合纺粘织物的SEM显微照片；
图16显示经历两个水刺过程的原纤化纤维的纺粘织物的SEM显微照片；
图17显示三叶形双组分纤维的各种示意图和显示芯被尖端包裹的SEM显微照片；
图18示出热粘合和原纤化和粘合的三叶形双组分纤维；
图19示出用不足的能量原纤化的三叶形双组分纤维。
具体实施方式
现在将更详细地参照附图对本发明进行更详细的说明。文中公开的主题涉及一种用于生产连续长丝和随后具有改进的柔性、耐磨性和耐用性的织物的方法。本发明的基础是形成包括包裹内部纤维组分的外部纤维组分的双组分长丝。优选地，所述内部纤维组分由多根纤维组成，并且所述长丝具有海岛构型。本发明的一个重要特征是外部纤维包裹内部纤维。通过这样做，允许内部纤维在外部纤维固化之前结晶和固化。这促成非常结实的岛纤维。该构型使外部纤维组分能够通过外部能量原纤化，从而使自身与内部纤维组分分离。本发明的另一个重要方面在于，随着原纤化，内部海纤维仍然是连续纤维而外部海组分也形成连续的纤维单元，所述连续的纤维单元与海纤维相互作用，形成各纤维之间的粘合。这促进本发明的高强度方面，尽管各纤维自身在微米和纳米量级。
优选地，通过水刺过程中的喷水提供外部能量，其同时使外部纤维原纤化和使外部纤维与其它外部纤维以及与内部纤维保持粘合构型。在实践本发明的该方面时，内部岛纤维和外部海纤维都不溶于水，导致非织造物品中的外部海纤维与内部海纤维保持粘合。
优选地，生产非织造织物的方法包括纺一组包括外部纤维组分和内部纤维组分的双组分纤维，其中外部纤维沿其长度完全包裹内部纤维。在大多数优选实施方案中，外部纤维是比内部纤维更柔软的材料并被原纤化而暴露内部纤维组分。纤维是连续的，从而提高了本发明的经济可行性。因此，原纤化时，内部岛纤维和外部海纤维都主要是相互缠绕形成高强度的连续纤维。最优选原纤化过程使用水能来原纤化外部纤维组分，并且具有足够的能量用于水刺该组双组分纤维。水刺过程通常在双组分纤维定位到纤维网上之后进行。该过程的结果是生产出微旦尼尔纤维，其可小于0.5微米。
此外，通过提供海岛构型或1个海的皮/芯构型，除通常可以使用扇形嵌段技术得到的材料外，可使用不同的材料用于海组分。任意两种熔融温度、粘度和骤冷特性显著不同的聚合物不能形成为可分裂的扇形嵌段纤维。例子包括聚烯烃(PE、PP)和聚酯或尼龙、聚烯烃(PE、PP)和热塑性聚氨酯、聚酯或尼龙和热塑性聚氨酯等。在海岛纤维构型中，这些组合中的任一个都是可以的，因为海包裹岛，只要在纤维形成过程中能够延伸或拉伸海材料，纤维的形成就不是难题。而且，通常对于海岛构型而言，要除去海，因此在之前不可能将惰性材料用于外部组分，因为它们难以从溶剂中除去。由于保留外部组分，而没有必要除去，同时由于在纤维的机械粘合中使用外部组分，因此使得纤维更结实。
本发明的另一个关键方面在于内部组分纤维可生产为具有非楔形横断面。该横断面可以是多叶形或圆形。该构型比楔形纤维提供更好的织物蓬松性，并使纤维能够具有更多的运动。该构型产生更难撕裂的纤维。
此外，通过原纤化外部聚合物组分或海，可以生产由微米或纳米纤维构成的高度柔软和更为透气的非织造织物，进而生产耐用的并具有良好耐磨性的过滤器、揩布、抹布和纺织品。如果需要更大的强度，可在原纤化所述外部纤维后对内部和外部纤维进行热粘合。在双组分构型中，外部组分可包括纤维总体的约5％～95％。
在选择用于纤维组分的材料时，可以使用各种类型，只要外部纤维组分与岛组分不相容即可。本文中不相容性定义为两种纤维组分间形成清晰的界面，使得一种纤维不扩散到另一种纤维中去。一个更好的例子包括将尼龙和聚酯用于两种不同的组分。其中该纤维可能限于在典型的现有技术扇形嵌段结构中的使用，通过使用海岛结构，两种组分可共存形成非常值得期望的高强度非织造织物。内部纤维可由选自热塑性聚合物的热塑性材料构成，其中热塑性聚合物为具有通过酯键头尾相连的长链醚酯单元和短链酯单元的共聚醚酯弹性体。内部纤维可由选自热塑性聚合物的聚合物构成，其中热塑性聚合物选自尼龙6、尼龙6/6、尼龙6，6/6、尼龙6/10、尼龙6/11、尼龙6/12、聚丙烯或聚乙烯、聚酯、共聚酯或其它类似的热塑性聚合物。内部纤维可由选自热塑性聚合物的聚合物构成，该热塑性聚合物包括聚酯、聚酰胺、热塑性共聚醚酯弹性体、聚烯烃、聚丙烯酸酯和热塑性液晶聚合物。
外部纤维也可包括选自热塑性聚合物的热塑性材料，其中所述热塑性聚合物为具有通过酯键头尾相连的长链醚酯单元和短链酯单元的共聚醚酯弹性体。外部纤维可包括选自热塑性聚合物的聚合物，其中热塑性聚合物选自尼龙6、尼龙6/6、尼龙6，6/6、尼龙6/10、尼龙6/11、尼龙6/12、聚丙烯或聚乙烯。外部纤维由选自热塑性聚合物的聚合物构成，该热塑性聚合物包括聚酯、聚酰胺、热塑性共聚醚酯弹性体、聚烯烃、聚丙烯酸酯和热塑性液晶聚合物。
在加工期间，优选以4比1的比例拉伸纤维。而且，非常快速地纺制纤维，在一些实施例中以三和四千米每分钟的速率纺丝。随着内部纤维完全被包裹，该纤维比外部纤维固化得更快。此外，由于两种纤维之间的清晰界面以及内部和外部纤维之间的低扩散或没有扩散，纤维容易被原纤化。可以通过机械、热或水刺进行原纤化。如果使用水刺，则外表面暴露的织物可对两个外表面或只对一个外表面进行水刺加工。优选地，利用来自一个或多个水刺歧管的水压，在10巴到1000巴之间的水压下原纤化和水刺所述纤维组分。本发明的另一个特征在于所选的纤维材料可以用树脂涂覆以形成不透性材料或可在外部组分原纤化之后进行喷射染色工艺。优选地，在干燥工艺期间，织物沿机器纵向被拉伸以再定向织物中的纤维，并且在干燥工艺期间，干燥工艺的温度足够高于聚合物的玻璃化转变温度并低于熔融开始温度，以通过热定型形成记忆，以便在最终的织物内产生横向拉伸和回缩。
本发明的关键特征在于原纤化时海纤维与岛纤维相互缠绕并缠结。因此，虽然可以生产出微米和纳米量级的岛纤维，但是海组分也在各纤维之间分开而形成海组分的微米和纳米纤维。因此，海纤维和岛纤维从单一双组分纤维产生连续的微米和纳米纤维。而且，由于纤维保持结构的完整性，它们能够相互缠绕和缠结形成高强度纤维。此外，除能够使用不相容组分外，可利用不可能使用现有扇形嵌段技术结合的这些组分来生产最终的非织造物品。
此外，虽然某些现有技术公开了海岛纤维构型，但是这些公开通常公开PVA的使用。由于PVA通常是溶于水的，所以不利于水刺，也不适于形成为可能经受水环境的物品。
虽然本发明关注双组分纤维的生产，但是本发明也涉及连续双组分长丝的生产和将长丝引入到所生产的非织造物品中。可进行该生产以生产织物，所述织物是机织或针织的，由双组分海岛纤维和长丝制成，或可以是非织造织物，通过纺粘或通过使用通过几种方式中的任一种形成为纤维网并以类似于纺粘长丝纤维网所用的方式粘合的双组分短纤维而形成。
本发明人已经发现，采用皮芯或海岛形式的双组分纤维(图6)，如果皮或海聚合物足够弱，尤其是两种组分相互具有小的亲和力或没有亲和力时，可通过水刺使纤维分裂。纤维的例子示于图7。注意，岛被海(或皮)“保护”，因此纤维纺丝将不再是难题。使用可以容易地机械分裂或原纤化的聚合物是有利的。图7中的纤维全都由线性低密度聚乙烯(LLDPE)制成，而芯或岛都由尼龙制成。当需要机械分裂纤维时，这些聚合物组合似乎表现良好。其它组合如尼龙和聚酯和PLA与其它聚合物如尼龙、热塑性聚氨酯和其它热塑性材料也是可以的。最终的结构将非常柔韧、柔软并可压缩。传递给织物的能量的量决定纤维分裂的程度。图8和9分别显示在低和高能量水平下水刺的200克/平方米织物的表面。很明显，较低的能量水平不足以完全分裂纤维。在一些优选实施方案中，点粘合由原纤化纤维构成的织物以获得更高的强度。
所生产纤维的强度的例子如下所示：
实施例
下文给出几个例子以示范所生产织物的性质：
所有织物重约180克/平方米。
实施例1.两个能量水平下的100％尼龙水刺样品
Figure 2006800228045A00800011
Figure 2006800228045A00800012
实施例2.75/25％尼龙岛/PE海，108个岛
75/25％尼龙/PE，108岛-舌形撕裂(磅)
Figure 2006800228045A00800013
75/25％尼龙/PE，108岛-抓样张力(磅)
Figure 2006800228045A00800014
注意，热轧提高性能，因为海被熔融并包裹纤维，从而增加强度。
注意，所有的海岛样品明显优于100％的尼龙。
可利用高强度双组分非织造织物生产的物品包括帐篷、降落伞、户外织物、家用包裹物、遮篷等。一些实施例已经生产出撕裂强度大于6克每旦尼尔的非织造物品和耐受10磅以上撕裂力的其它物品。
本发明人已经发现，如果操作得当，海岛提供一种非常灵活的形成原纤化纤维的方法，其中可以在其它条件都相同的情况下通过岛支数的总数来控制岛纤维的尺寸。这已经进行了实践，特别地，纺粘技术提供一种简单且节省成本的生产这种耐用织物的方法。
而且，如图17、18和19所示，双组分纤维可以是三叶形的。在该构型中，中央的岛完全被三个叶片包围。因此，在原纤化时，生产四根单独的纤维，其相互包裹形成高强度织物。在一些不能生产完全海岛结构的情况下，该结构更为可行。还示出了热粘合双组分纤维和经原纤化且粘合的双组分纤维之间的差异。图19也示出原纤化纤维时使用不足能量的情况。
本发明涉及一种已经被公开的用于生产具有改进的柔性、耐磨损性和耐用性的高强度纺粘非织造织物的方法。本发明的基础在于形成由两种化学结构不同的聚合物构成的皮芯(一个岛)或海岛形式的双组分纺粘纤维网，其中海材料保护皮或岛，并且是比岛或芯更软的材料，并且其中该纤维网通过下列步骤粘合：
(a)针刺然后水刺，不用任何热粘合，其中水刺的能量导致皮芯或海岛结构的部分或完全分裂。
(b)单独水刺纤维网，不用任何针刺或随后的热粘合，其中水刺的能量导致皮芯或海岛结构的部分或完全分裂。
(c)如上述(a)中所述水刺纤维网，然后在轧光机上热粘合。
(d)如上述(a)中所述水刺纤维网，然后在热风穿透烘箱中，在熔化海或皮的熔融温度或更高的温度下热粘合以形成更结实的织物。

Claims (30)

1.一种生产非织造织物的方法，所述方法包括：
纺一组双组分纤维，所述双组分纤维包括：外部纤维组分和内部纤维组分，其中所述外部纤维组分包裹所述内部纤维组分，并且所述内部纤维组分的横断面为圆形或多叶形，进行所述纺使得所述内部纤维组分在所述外部纤维组分固化之前结晶和固化；
将该组双组分纤维定位到纤维网上；和
原纤化所述外部纤维组分，使所述内部纤维组分暴露，并且使所述内部纤维组分与所述外部纤维组分之间相互缠绕，以形成缠结的网而无需除去所述外部纤维组分，使得在原纤化之后，所述内部纤维组分为缠结的微旦尼尔纤维的形式，所述外部纤维组分提供为与所述内部纤维组分的所述微旦尼尔纤维缠绕的微旦尼尔纤维。
2.权利要求1的生产非织造织物的方法，其还包括使用水能来原纤化所述外部纤维组分。
3.权利要求2的生产非织造织物的方法，其还包括使用所述水能来水刺该组双组分纤维。
4.权利要求1的生产所述非织造织物的方法，其中所述外部纤维组分被原纤化之后，将所述内部纤维组分和外部纤维组分进行热粘合。
5.权利要求1的方法，其中所述外部纤维组分比所述双组分纤维的所述内部纤维组分更粘。
6.权利要求1的方法，其中所述内部纤维组分包括选自热塑性聚合物的热塑性材料，其中所述热塑性聚合物为具有通过酯键头尾相连的长链醚酯单元和短链酯单元的共聚醚酯弹性体。
7.权利要求1的方法，其中所述外部纤维组分包括选自热塑性聚合物的热塑性材料，其中所述热塑性聚合物为具有通过酯键头尾相连的长链醚酯单元和短链酯单元的共聚醚酯弹性体。
8.权利要求1的方法，其中所述内部纤维组分包括选自热塑性聚合物的聚合物，其中所述热塑性聚合物选自尼龙6、尼龙6/6、尼龙6，6/6、尼龙6/10、尼龙6/11、尼龙6/12、聚丙烯或聚乙烯。
9.权利要求1的方法，其中所述外部纤维组分包括选自热塑性聚合物的聚合物，其中所述热塑性聚合物选自尼龙6、尼龙6/6、尼龙6，6/6、尼龙6/10、尼龙6/11、尼龙6/12、聚丙烯或聚乙烯。
10.权利要求1的方法，其中所述外部纤维组分由选自如下热塑性聚合物的聚合物构成：聚酯、聚酰胺、热塑性共聚醚酯弹性体、聚烯烃、聚丙烯酸酯和热塑性液晶聚合物。
11.权利要求1的方法，其中所述内部纤维组分由选自如下热塑性聚合物的聚合物构成：聚酯、聚酰胺、热塑性共聚醚酯弹性体、聚烯烃、聚丙烯酸酯和热塑性液晶聚合物。
12.权利要求1的方法，其中所述内部纤维组分是多叶形的。
13.权利要求1的方法，其中所述内部纤维组分具有圆形横断面。
14.权利要求1的方法，其中所述外部纤维组分占所述纤维总体的5％～95％。
15.权利要求1的方法，其中所述双组分纤维的网具有两个外表面且所述织物的两个表面都进行水刺。
16.权利要求1的方法，其中所述双组分纤维的网只有一个表面进行水刺加工。
17.权利要求1的方法，其中所述双组分纤维的网暴露于来自一个或多个水刺歧管的水压下，水压在10巴到1000巴之间。
18.权利要求1的方法，其中所述双组分纤维的网涂有树脂以形成不透性材料。
19.权利要求1的方法，其中在所述外部组分原纤化之后，对所述双组分纤维的网进行喷射染色。
20.权利要求1的方法，其中所述双组分纤维的网在干燥工艺期间沿机器纵向被拉伸，然后立即水刺以再定向所述网中的纤维。
21.权利要求20的方法，其中所述干燥工艺的温度足够高于所述双组分纤维聚合物的玻璃化转变温度并低于熔融开始温度，以通过热定型形成记忆，以便在所述网内产生横向拉伸和回缩。
22.权利要求1的方法，其中所述双组分纤维为海岛纤维的形式。
23.权利要求1的方法，其中所述内部纤维组分包括聚酯或尼龙，所述外部纤维组分包括聚烯烃。
24.权利要求1的方法，还包括：由所述网形成非织造制品。
25.一种生产适用于形成非织造制品的形式为缠结的网的非织造织物的方法，所述方法包括：
纺一组连续的长丝双组分海岛纤维，其包括：通过外部海组分包裹的多个内部岛，其中所述内部岛的横断面为圆形或多叶形，并且其中所述外部海组分和所述内部岛均不溶于水，进行所述纺使得所述内部纤维组分在所述外部海组分固化之前结晶和固化；
将该组双组分海岛纤维定位到纤维网上；
水刺所述连续的长丝双组分海岛纤维以形成缠结的纤维网，所述水刺使所述外部海组分分离和使所述内部岛暴露，使得在水刺之后，所述内部岛为缠结的微旦尼尔纤维的形式，所述外部海组分提供为与所述内部纤维组分的所述微旦尼尔纤维缠绕的微旦尼尔纤维；和
收集缠结的内部岛纤维和缠绕的外部海组分纤维的网而无需除去所述外部海组分纤维，其中所述外部海组分纤维仍与所述内部岛纤维组分相互缠绕以增加所述网的强度。
26.权利要求25的方法，其中所述水刺步骤之后，将所述网进行热粘合。
27.权利要求25的方法，其中所述双组分纤维的所述外部海组分比所述内部岛更粘。
28.权利要求25的方法，其中所述内部岛包括聚酯或尼龙，所述外部海组分包括聚烯烃。
29.权利要求25的方法，其中所述内部岛和所述外部海组分中的一种包括聚酯，所述内部岛和所述外部海组分中的另一种包括尼龙。
30.权利要求25的方法，还包括：由所述网形成非织造制品。
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