CN1107133C - 无纺布及该无纺布的制造方法 - Google Patents

无纺布及该无纺布的制造方法 Download PDF

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CN1107133C
CN1107133C CN98125489A CN98125489A CN1107133C CN 1107133 C CN1107133 C CN 1107133C CN 98125489 A CN98125489 A CN 98125489A CN 98125489 A CN98125489 A CN 98125489A CN 1107133 C CN1107133 C CN 1107133C
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小林利夫
竹内直人
铃木未央
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Abstract

一种无纺布，非常适合于用作厨房用纸，前述无纺布用重量百分比为90～10%的、长度为5～30mm、纤度为0.1～0.8d的极细的热塑性合成纤维，和重量百分比为10～90%的、长度为2～7mm的纸浆纤维构成，纤维大体同样地混合并相互机械地交织，而且具有10～80g/m2的坪量。

Description

无纺布及该无纺布的制造方法
本发明涉及适用于有吸水性的厨房用纸及擦拭污垢用的薄纸等的压花加工性良好的无纺布及其制造方法。
在现有技术中，对从纤度1～10d的热塑性合成纤维与纸浆纤维得到的无纺布进行压花加工，在表面上形成许多凹凸，并将此无纺布作为有吸水性的厨房用纸及擦拭污垢用的薄纸来使用。
前述现有技术的厨房用纸这一类，由于合成纤维具有比较高的刚性与弹性，故通过压花加工等不容易在其表面上形成凹凸。尤其是，在要求具有微细的凹凸和鲜明的轮廓形状的凹凸时，这种倾向变强。
如果用压花加工机处理无纺布，形成5mm左右或小于它的直径的开孔，做成厨房用纸，则纤维从开孔的周围边缘向开孔内部突出，有着开孔的轮廓变得不鲜明的情况。也不容易使纤维沿着用于形成开孔的压花加工机的突起的周围重新排列。孔径越小、或者无纺布的坪量越大，这种情况越显著。如果纤维向开孔内部突出，则其作用实质上使孔径变小，但是，由于其程度不一定是确定的，使开孔的设计变得困难。因此，在用于厨房用纸等的无纺布上，希望容易形成凹凸和开孔，使成形性得到改善。
因此，本发明的目的在于提供一种无纺布及该无纺布的制造方法，该无纺布在用作厨房用纸等时，能够容易形成凹凸等，具有良好的成形性。
为了实现上述目的，作为本发明的第一发明以含有极细的热塑性合成纤维的无纺布为对象。
上述第一发明其特征在于：前述无纺布用重量百分比为90～10％的、长度为5～30mm、纤度为0.1～0.8d的极细的热塑性合成纤维，和重量百分比为10～90％的、长度为2～7mm的纸浆纤维构成，这些构成纤维大体同样地混合并相互机械地交织，而且具有10～80g/m2的坪量。
在第一发明的优选实施例中，前述热塑性合成纤维为熔吹的纤维。
为了实现上述目的，本发明的第二发明是以含有极细的热塑性合成纤维的无纺布的制造方法为对象，其特征在于：该制造方法至少包含下列a和b的工序。
a.将由重量百分比为90～10％的、长度为7～30mm、纤度为0.1～0.8d的极细的热塑性合成纤维、和重量百分比为10～90％的、长度为2～7mm的纸浆纤维构成的纤维成分，相对于水按0.5～20％重量百分比分散，制成料浆，并从料浆抄浆成湿润薄层的工序；
b.将前述湿润薄层支承放置在支持体上，通过向该薄层喷射50～200kgf/cm2的柱状压力水流，而使前述纤维混合物的纤维相互机械地交织的工序。
在第二发明的优选的实施例中，前述热塑性合成纤维为熔吹的纤维。
图1为无纺布的平面图。
图2为厨房用纸的斜视图。
图3为无纺布的制造工序图。
图4为滚筒的斜视图。
下面，参考附图详细说明与本发明有关的无纺布及该无纺布的制造方法。
图1中用平面图示出的无纺布1，是作为后述的厨房用纸1A来使用，具有10～80g/m2的坪量。无纺布1含有90～10％重量百分比的长度为7～30mm、纤度为0.1～0.8d的极细热塑性合成纤维3、和10～90％重量百分比的长度为2～7mm的纸浆纤维4(例如NBKP)。这些纤维3、4大体同样地混合，各纤维之间通过机械地交织保持成无纺布的形态。各个纤维或是无秩序地分布，或是在无纺布1的后述制造工序中仅仅稍微沿机械方向取向。在无纺布1中不使用聚乙烯醇(ポバ-ル)及其它粘结用药剂。
在图2中示出了厨房用纸1A的斜视图，该纸具有通过在图1的无纺布上进行压花加工或凹压加工而得到的许多隆起部分51。厨房用纸1A的隆起部分51具有高度h，并沿纵向与横向按间距y和x排列。高度h在0.2～5mm的范围内，y与x在1～10mm的范围内。合成纤维3与纸浆纤维4，仅有时稍微从隆起部分的下部向顶部取向，但是在各隆起部分51之间则与图1一样无秩序地排列。
图3为无纺布1和由其得到的厨房用纸1A的制造工序的一个例子，它的构成如下：在图的左方，用送液管将热塑性合成纤维3与纸浆纤维4形成10∶90～90∶10重量百分比的、纤维成分含有0.5～20％重量百分比的料浆送入料浆槽12中。在环形带13处于向右上倾斜状态的抽吸区14内，将槽12内的料浆供至带13上。在区14内，用真空泵16将料浆进行脱水处理，得到湿润的薄层17。接着，在第一区18内，将来自第一喷嘴19的柱状高压水流喷射至薄层17上，使质地稳定，并将该薄层17输送至第二区22的回转滚筒23上。在第一区18喷射后的水用抽吸机构20抽吸。在第二区22中，相对于载放在表面平滑的滚筒23上的薄层17喷射来自第二喷嘴24的柱状高压水流，使薄层17的构成纤维互相机械地强力交织。进而，将薄层17送至第二环形带28，在第三区26内，向薄层17喷射来自第三喷嘴27的柱状高压水流，然后，此薄层17用脱水干燥机29进行脱水、加热干燥，得到无纺布31。将此无纺布31按适当的尺寸切断，即为图1的无纺布1。无纺布31在必要时进一步继续被送至一对压花辊32、33间。在一方的辊子32的表面上，形成由许多圆锥状和角锥状的突起构成的赋形部件34，通过将此部件34与无纺布31加压接触，就可得到具有图2的隆起部分51的厨房用纸1A的连续体。无纺布31或厨房用纸1A的连续体1A作为卷材36，36被卷绕。进而在必要时，可使用压花加工机等，在无纺布31或厨房用纸1A的连续体上形成许多0.5～5mm左右的开孔，做成厨房用纸1A。
在此制造工序中，在第二、三区22、26内，最好设置与第一区18相同的抽吸机构20。第一至第三区18、22、26的柱状加压水流的压力最好在50～200kgf/cm2的范围内。还有，第一至第三区18、22、26不一定都需要使用，也可以省去任何一个区。
图4为具有表面平坦部分232和许多突起231和许多通水孔233的滚筒230的斜视图。也可以用此滚筒230代替图3中使用的表面平滑的滚筒23，制成与图2相同的厨房用纸1A的连续体。滚筒230是在日本专利申请特开昭61-176346号、特开昭62-69867号公报中公开的那种，如果使载放在滚筒230上的湿润的薄层17受到柱状压力水流的作用，则纤维3、4仿照突起231的形状重新排列，在薄层17上形成隆起部分51。由于滚筒230的突起231相当于图3的赋形部件34的部位，故在使用此滚筒230时，不需要图3中所示的用一对辊子32、33来进行隆起部分形成的工序。滚筒230的外周表面可以不用孔状过滤网形成，而是利用网筛的接结部分作为形成隆起部分的赋形部件34。
图3中所示例子的工序得到的无纺布31，由于构成纤维3、4的任一个都比较短，以及合成纤维3的纤度比较小而刚性低，故能比较忠实地仿照赋形部件34的形状。在赋形部件34的高度(h)为1～3mm的较微细的情况下，以及有明显棱线的多角的情况下，无纺布1的成形性良好的特征得到充分发挥。这种无纺布31的坪量在10～80g/m2的范围内，合成纤维3最好为熔吹(メルトブロ-ン)的纤维。
在此制造工序中，通过将由比较短的纤维3、4做成的料浆供至有上升斜坡的环形带13，使朝着带13的前进方向即机械方向的纤维3、4的排列方向受到限制。在厨房用纸1A的各个隆起部分51之间，纤维3、4或是稍微朝机械方向排列，或是无秩序地分布，厨房用纸1A成为比较等方向性的物品。
通过利用现有技术的技术，将从梳理机供给的纤维网用图3的第一区18以后的工序处理，可以形成具有隆起部分的无纺布。但是，由于用传统的梳理机处理的纤维的长度大致要超过30mm，故根据现有技术，难于制造用本发明得到的成形性良好的无纺布1或31。
本发明的无纺布，由于是通过使纤维长度变短而纤度小的热塑性合成纤维机械地交织而形成的，所以是容易忠实地仿照赋形部件的形状、成形性良好的无纺布。这种无纺布，如果在其表面上形成许多隆起部分或开孔，则可以作为厨房用纸或拭去污垢用的薄纸来使用。
根据本发明的无纺布的制造方法，即使是用在梳理机上不能处理的那种比较短的纤维，也可能制得无纺布。

Claims (4)

1.一种无纺布，其是含有极细的热塑性合成纤维的无纺布，其特征在于：前述无纺布用重量百分比为90～10％的、长度为7～30mm、纤度为0.1～0.8d的极细的热塑性合成纤维，和重量百分比为10～90％的、长度为2～7mm的纸浆纤维构成，这些构成纤维大体同样地混合并相互机械地交织，而且具有10～80g/m2的坪量。
2.如权利要求1所述的无纺布，其特征在于：前述热塑性合成纤维为熔吹的纤维。
3.一种无纺布的制造方法，该方法是含有极细的热塑性合成纤维的无纺布的制造方法，其特征在于：该制造方法至少包含下列a和b的工序。
a.将由重量百分比为90～10％的、长度为7～30mm、纤度为0.1～0.8d的极细的热塑性合成纤维、和重量百分比为10～90％的、长度为2～7mm的纸浆纤维构成的纤维成分，相对于水按0.5～20％的重量百分比分散，制成料浆，并从料浆抄浆成湿润薄层的工序；
b.将前述湿润薄层支承放置在支持体上，通过向该薄层喷射50～200kgf/cm2的柱状压力水流而使前述纤维混合物的纤维相互机械地交织的工序。
4.如权利要求3所述的制造方法，前述热塑性合成纤维为熔吹的纤维。
CN98125489A 1997-12-26 1998-12-25 无纺布及该无纺布的制造方法 Expired - Fee Related CN1107133C (zh)

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