CN103857525B - 网状体 - Google Patents

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CN103857525B
CN103857525B CN201280049306.5A CN201280049306A CN103857525B CN 103857525 B CN103857525 B CN 103857525B CN 201280049306 A CN201280049306 A CN 201280049306A CN 103857525 B CN103857525 B CN 103857525B
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net
thermoplastic resin
adhesive linkage
uniaxial orientation
orientation
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CN103857525A (zh
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原重雅浩
中泽成寿
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Eneos Corp
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JX Nippon Oil and Energy Corp
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Abstract

本发明提供具有良好的取向性并且具有较高的耐热性的聚对苯二甲酸乙二醇酯制的网状体。裂口网状物(1)（纵向网状物）和狭缝网状物(6)（横向网状物）各自具有对由第一热塑性树脂形成的层（主层）的两面赋予由第二热塑性树脂形成的粘接层而形成的三层结构。第二热塑性树脂在低于第一热塑性树脂的熔点的温度下具有热封性。无纺布(8)是隔着各网状物的粘接层以纵向网状物的取向轴与横向网状物的取向轴交叉的方式经纬层叠而形成的。其中，第一热塑性树脂是聚对苯二甲酸乙二醇酯（PET）。另外，第二热塑性树脂是非结晶性聚对苯二甲酸乙二醇酯共聚物。在将纵向网状物与横向网状物经纬层叠之前，对各自的表面（粘接层）实施电晕处理。

Description

网状体
技术领域
本发明涉及将热塑性树脂制的单轴取向体以取向轴交叉的方式经纬层叠或编织而形成的网状体。
背景技术
专利文献1中记载了在透湿耐水性片中使用网状体（割纤无纺布）作为网状结构的强化材料。该割纤无纺布是将2个单轴取向体经纬层叠而形成的。单轴取向体具有如下形成的三层结构：对由第一热塑性树脂形成的主层的两面赋予由具有比第一热塑性树脂的熔点低的熔点的第二热塑性树脂形成的粘接层。
现有技术文献
专利文献
专利文献1:日本特开2002-210884号公报
发明内容
发明要解决的问题
上述网状体例如用作汽车用空气滤清器的支撑体（形状保持构件）。在制造该空气滤清器时，例如使用粘接剂使棉织物等与网状体粘接。关于该粘接工序，从使制造效率化的观点考虑，要求采用较高温度（例如200℃）且短时间进行处理。因此，应该考虑提高网状体的耐热性，最近研究了使用具有较高熔点（260℃左右）的聚对苯二甲酸乙二醇酯制的网状体代替具有较低熔点的聚乙烯制或聚丙烯制的网状体来作为上述支撑体。
然而，若构成网状体的单轴取向体为聚对苯二甲酸乙二醇酯的单层结构且在经纬层叠时使单轴取向体彼此热熔接，则由于单轴取向体被加热至熔点以上而会导致单轴取向体的取向性零乱，结果存在单轴取向体的轴向强度（拉伸强度）降低的可能性。
因此，对于聚对苯二甲酸乙二醇酯制的单轴取向体来说，需要拥有包含聚对苯二甲酸乙二醇酯层（主层）以及在低于该层的熔点的温度下具有热封性的树脂层（粘接层）的至少两层的层叠结构，而并非上述那种单层结构。其中，热封性意指通过对经过经纬层叠或编织的各个单轴取向体施加热及压力从而能够将它们粘接的性能。
然而，还未发现对于由聚对苯二甲酸乙二醇酯形成的主层来说最合适的粘接层用树脂。
本发明鉴于这种实际情况，目的在于提供具有良好的取向性并且具有较高的耐热性的聚对苯二甲酸乙二醇酯制的网状体。
用于解决问题的方案
为此，作为前提，本发明的网状体是隔着粘接层将单轴取向体以取向轴交叉的方式经纬层叠或编织而形成的，所述单轴取向体是对由第一热塑性树脂形成的主层的至少一面赋予由在低于第一热塑性树脂的熔点的温度下具有热封性的第二热塑性树脂形成的粘接层而形成的。其中，以第一热塑性树脂是聚对苯二甲酸乙二醇酯、第二热塑性树脂是非结晶性聚对苯二甲酸乙二醇酯共聚物为特征。
发明的效果
根据本发明，构成单轴取向体的粘接层的第二热塑性树脂是非结晶性聚对苯二甲酸乙二醇酯共聚物。由此，能够在主层（聚对苯二甲酸乙二醇酯）的熔点以下下使单轴取向体的粘接层彼此粘接，因而能够使单轴取向体的取向性保持良好地形成网状体。
另外，根据本发明，由于单轴取向体的主层由聚对苯二甲酸乙二醇酯构成，因此与主层由聚乙烯或聚丙烯构成的情况相比，网状体可以具有较高的耐热性。
附图说明
图1是构成本发明的一实施方式的网状体的第1例的裂口网状物（splitweb）的结构示意图。
图2是图1的P部分的局部放大图。
图3是构成上述实施方式的网状体的第1例的狭缝网状物（slit web）的结构示意图。
图4是图3的Q部分的局部放大图。
图5是构成上述实施方式的网状体的第2例及第3例的单轴取向带的结构示意图。
图6是显示作为上述实施方式的网状体的第1例的无纺布的简要结构的局部俯视图。
图7是显示作为上述实施方式的网状体的第2例的无纺布的简要结构的局部俯视图。
图8是显示作为上述实施方式的网状体的第3例的织布的简要结构的局部立体图。
图9是显示上述实施方式的裂口网状物的制造方法的图。
图10是显示上述实施方式的网状体的制造方法的第1例的图。
图11是显示电晕处理装置的图。
图12是显示上述实施方式的网状体的制造方法的第2例的图。
图13是显示上述实施方式的裂口网状物的变形例的图。
图14是显示上述实施方式的狭缝网状物的变形例的图。
图15是显示上述实施方式的单轴取向带的变形例的图。
具体实施方式
以下基于附图说明本发明的实施方式。
图1和图2表示构成本发明的一实施方式的网状体的第1例的单轴取向体。
图1所示的裂口网状物1对应于本发明的单轴取向体，是沿着纵向（裂口网状物1的取向轴1a的轴向）单轴拉伸热塑性树脂制的薄膜后沿纵向割纤并使其展宽而形成的。具体而言，裂口网状物1如下形成：在沿纵向（长度方向）拉伸多层薄膜后，使用开纤器沿同方向交错地割纤（开纤处理）从而形成网状的薄膜，进而展宽至规定宽度而形成，所述多层薄膜是使用第一热塑性树脂以及在低于第一热塑性树脂的熔点的温度下具有热封性的第二热塑性树脂通过多层T模头法等成型法而制作的，该多层薄膜至少包含两层（图中为三层）。另外，遍及整个宽度方向，裂口网状物1在纵向上具有较高的强度。需要说明的是，图中的附图标记2对应于干纤维、附图标记3对应于支纤维。
图2是图1的P部分的局部放大图，裂口网状物1具有对第一热塑性树脂层（主层）4的两面赋予第二热塑性树脂层5而形成的三层结构。第二热塑性树脂层5在形成后述的无纺布8（网状体的第1例）时作为与后述的狭缝网状物6一起经纬层叠时的网状物相互间的粘接层发挥作用。
其中，第一热塑性树脂是熔点为260℃左右的聚对苯二甲酸乙二醇酯（以下称为“PET”）。
另外，第二热塑性树脂是在低于第一热塑性树脂的熔点的温度下具有热封性的非结晶性聚对苯二甲酸乙二醇酯共聚物（以下称为“非结晶性PET共聚物”）。
非结晶性PET共聚物是针对于PET的二元醇成分使用共聚单体置换部分乙二醇而生成的。作为该二元醇成分的共聚单体，例如可列举出1,4-环己烷二甲醇（CHDM）、新戊二醇（NPG）、1,4-丁二醇（BDO）、1,3-丙二醇（PDO）。尤其是非结晶性PET共聚物中包含CHDM作为共聚单体的共聚物一般被称为PET-G。
另外，非结晶性PET共聚物可以针对于PET的二羧酸成分使用共聚单体置换部分对苯二甲酸而生成。作为该二羧酸成分的共聚单体，例如可列举出IPA。
由于非结晶性PET共聚物可利用上述共聚单体来抑制结晶化，因此在低于PET的熔点的温度下具有热封性。
关于非结晶性PET共聚物，该共聚单体的比例越高，越能够抑制结晶化，因此可以使作为网状物相互间的粘接层的作用提升。
然而，本发明人等发现非结晶性PET共聚物中共聚单体的比例过高时，不能良好地进行上述割纤（开纤处理）。
即，本发明人等发现，考虑到层5的粘接性及割纤（开纤处理）的操作性，对于非结晶性PET共聚物来说需要设定共聚单体的比例。
如此，本发明人等发现，对于非结晶性PET共聚物的二元醇成分通过将共聚单体与乙二醇的比率（摩尔比）优选设为9：91～50：50、更优选设为15：85～30：70（换而言之，通过将二元醇成分中共聚单体的比率（摩尔比）优选设为9摩尔%～50摩尔%、更优选设为15摩尔%～30摩尔%），从而能够确保层5的良好粘接性及割纤（开纤处理）的良好操作性。
因此，本实施方式中，基于上述见解来设定共聚单体与乙二醇的比率（摩尔比）。
图3所示的狭缝网状物6对应于本发明的单轴取向体，是沿横向（狭缝网状物6的取向轴6a的轴向）对热塑性树脂制的薄膜开设多条狭缝之后沿横向单轴拉伸而形成的。具体而言，狭缝网状物6如下形成：横向（宽度方向）上除了上述多层薄膜的两边缘部以外的部分例如使用热刀刃等平行地形成交错线等间断的狭缝之后，沿横向拉伸而形成。另外，狭缝网状物6在横向上具有较高的强度。
图4是图3的Q部分的局部放大图，狭缝网状物6具有对第一热塑性树脂层（主层）4’的两面赋予第二热塑性树脂层5’而形成的三层结构。第二热塑性树脂层5’在形成后述的无纺布8（网状体的第1例）时作为与裂口网状物1一起经纬层叠时的网状物相互间的粘接层发挥作用。其中，第一热塑性树脂层4’与第一热塑性树脂4同为PET。另外，第二热塑性树脂层5’与第二热塑性树脂5同为非结晶性PET共聚物。
图5显示构成本实施方式的网状体的第2例和第3例的单轴取向体。
图5所示的单轴取向带7对应于本发明的单轴取向体。单轴取向带7是使多层薄膜沿纵向或横向单轴取向并裁切而制成的多层拉伸带，所述多层薄膜是使用第一热塑性树脂和在低于第一热塑性树脂的熔点的温度下具有热封性的第二热塑性树脂通过多层T模头法等成型法制造的，该多层薄膜至少包含两层（图中为三层）。图5所示的单轴取向带7与裂口网状物1及狭缝网状物6同样地具有对第一热塑性树脂层（主层）4”的两面赋予第二热塑性树脂层5”而形成的三层结构。第二热塑性树脂层5”在形成后述的无纺布9（网状体的第2例）时作为经纬层叠单轴取向带7时的带相互间的粘接层发挥作用。另外，第二热塑性树脂层5”在形成后述的织布10（网状体的第3例）时作为编织单轴取向带7时的带相互间的粘接层发挥作用。需要说明的是，图中的附图标记7a对应于单轴取向带7的取向轴。其中，第一热塑性树脂层4”与第一热塑性树脂4同为PET。另外，第二热塑性树脂层5”与第二热塑性树脂5同为非结晶性PET共聚物。
图6～图8显示本实施方式的网状体的三个例子（上述网状体的第1例～第3例）。
图6显示本实施方式的网状体的第1例的无纺布8。无纺布8是将裂口网状物1与狭缝网状物6经纬层叠而形成的。无纺布8中，以裂口网状物1的取向轴1a与狭缝网状物6的取向轴6a相互正交的方式经纬层叠。另外，无纺布8中，层叠的裂口网状物1的接触部位彼此面粘接。
图7显示本实施方式的网状体的第2例的无纺布9。无纺布9是将平行排列单轴取向带7而成的组件两组层叠而形成的。无纺布9中，以一组单轴取向带7的取向轴7a与另一组单轴取向带7的取向轴7a相互正交的方式经纬层叠。另外，无纺布9中，层叠的单轴取向带7的接触部位彼此面粘接。
图8显示本实施方式的网状体的第3例的织布10。织布10是将单轴取向带7编织而形成的。织布10中，单轴取向带7彼此相互正交，因此取向轴7a彼此相互正交。另外，织布10中，正交的单轴取向带7的接触部位彼此面粘接。
接着，使用图9来说明本实施方式的单轴取向体的制造方法的一例。
图9显示作为单轴取向体的裂口网状物1的制造方法的概要。
如图9所示，裂口网状物1主要是经过如下工序制造而成的：（1）多层薄膜的取向工序；（2）平行于取向轴地对取向多层薄膜开纤的开纤工序；以及（3）将开纤的薄膜卷取的卷取工序等。
对以下各工序进行说明。在图9中，关于（1）取向工序，使利用多层T模头法等成型法预先制作并卷取的上述由第一热塑性树脂及第二热塑性树脂形成的三层结构的多层薄膜14通过具备红外线加热器、热风输送机等的烘箱15内，在加热至规定温度的同时，相对于初始尺寸以规定的取向倍率进行辊取向。
关于（2）开纤（割纤）工序，使上述取向的多层薄膜与以高速旋转的开纤器（旋转刀刃）16滑动接触，从而对薄膜进行开纤处理（割纤化）。
割纤而形成的裂口网状物1被展宽至规定宽度后，经过热处理部17的热处理，继而在（3）卷取工序中被卷取为规定的长度，成为裂口网状物1的卷取体18。
接着，使用图10～图12来说明本实施方式的网状体的制造方法的两个例子。
作为本实施方式的网状体的制造方法的第1例，图10显示将两张裂口网状物1层叠的无纺布的制造方法。
图10中，由原卷抽出辊110a抽出如图9所示地制造的裂口网状物110（纵向网状物），使其以规定的供给速度行进而送至展宽工序111，利用展宽机（未图示）展宽数倍，根据需要进行热处理。
之后，对展宽的纵向网状物（裂口网状物110）的表面（层5）实施电晕处理。
图11显示电晕处理所用的电晕处理装置。
如图11所示，电晕处理装置500具有高频电源501、控制器502和电极503。展宽的纵向网状物（裂口网状物110）卷挂在接地的处理辊504上，以一定的速度在电极503近旁通过。并且，通过在电极503与处理辊504之间施加由高频电源501产生的高频高电压输出，从而发生电晕放电。在该电晕放电下使纵向网状物通过，使该放电的能量作用于纵向网状物，由此纵向网状物的表面（层5）的润湿性提高且粘接性提高。
回到图10，与纵向网状物同样地由原卷抽出辊210a抽出另一裂口网状物210（横向网状物），使其以规定的供给速度行进而送至展宽工序211，利用展宽机（未图示）展宽数倍，根据需要进行热处理。
之后，与纵向网状物同样地也对展宽的横向网状物的表面（层5）实施电晕处理。
然后，将横向网状物切断成与纵向网状物的宽度相等的长度，从相对于纵向网状物的薄膜行进垂直的方向供给，在层叠工序112中隔着粘接层（第二热塑性树脂层5）以各网状物的取向轴相互正交的方式经纬层叠。在热压接工序113中，将经纬层叠的纵向网状物和横向网状物顺序地导入到外周面为镜面的热滚筒113a与镜面辊113b、113c之间并施加夹持压力。由此，纵向网状物与横向网状物被相互热压接而一体化。另外，纵向网状物与横向网状物的接触部位彼此整体面粘接。如此一体化后的纵向网状物和横向网状物在卷取工序中被卷取，从而成为经纬层叠无纺布的卷取体114。
另外，在图10中，替代裂口网状物110、210可将由在编织前实施了上述电晕处理的单轴取向带7形成的织布10输送至热压接工序113，将织布10导入到热滚筒113a与镜面辊113b、113c之间并施加夹持压力。该情况下，通过对织布10施加夹持压力，构成织布10的单轴取向带7被热压接而一体化。另外，正交的单轴取向带7的接触部位彼此整体面粘接。
作为本实施方式的网状体的制造方法的第2例，图12显示将裂口网状物1和狭缝网状物6层叠的无纺布8的制造方法。
无纺布8的制造方法主要包括：（1）相对于多层薄膜的长度方向垂直地进行开缝处理的开缝工序；（2）多层狭缝薄膜的取向工序；以及（3）使纵向网状物（裂口网状物1）与横向网状物（狭缝网状物6）层叠并进行热压接的压接工序。
对以下各工序进行说明。在图12中，关于（1）开缝工序，对于利用多层T模头法等成型法预先制作并卷取的上述由第一热塑性树脂及第二热塑性树脂形成的三层结构的多层薄膜314，横向开缝工序315中相对于行进方向垂直地交错开设横向狭缝。
关于（2）取向工序，横向取向工序316中对于进行了上述开缝处理的薄膜实施横向取向。如此得到的狭缝网状物6（横向网状物）的表面（层5’）被施以上述的电晕处理，然后被输送至（3）热压接工序317。
另一方面，与图10的纵向网状物同样地由原卷抽出辊410a抽出裂口网状物410（纵向网状物），使其以规定的供给速度行进而送至展宽工序411，利用展宽机（未图示）展宽数倍，根据需要进行热处理。之后，对纵向网状物的表面实施上述的电晕处理，然后将纵向网状物送至热压接工序317，在此使纵向网状物与横向网状物以各自的取向轴交叉的方式进行层叠并热压接。具体而言，通过将纵向网状物和横向网状物顺序导入到外周面为镜面的热滚筒317a与镜面辊317b、317c之间并对它们施加夹持压力，从而使它们相互热压接而一体化。由此，纵向网状物与横向网状物的接触部位彼此整体面粘接。如此一体化的纵向网状物和横向网状物被输送至卷取工序进行卷取，从而成为无纺布8的卷取体318。
需要说明的是，上述的网状体的制造方法的第1例及第2例中，在将纵向网状物与横向网状物经纬层叠之前，对各自的表面（层5、5’）实施电晕处理，但进行电晕处理的时机不限于此，可以在纵向网状物与横向网状物经纬层叠之前、获得基于电晕处理的提高网状物表面的粘接性的效果的任意时机实施电晕处理。
上述单轴取向体（裂口网状物1、狭缝网状物6以及单轴取向带7）具有对第一热塑性树脂（PET）层的两面赋予第二热塑性树脂（非结晶性PET共聚物）层而形成的三层结构，但单轴取向体的层结构不限于此，单轴取向体也可以具有对第一热塑性树脂（PET）层的一面赋予第二热塑性树脂（非结晶性PET共聚物）层而形成的两层结构。
使用图13～图15对该单轴取向体的两层结构进行说明。
图13所示的局部放大图与图2示出的局部放大图对应、显示图1和图2示出的裂口网状物1的变形例。
对于该变形例（裂口网状物1’）与裂口网状物1的不同点进行说明。
图13所示的裂口网状物1’具有对第一热塑性树脂（PET）层（主层）4的一面赋予第二热塑性树脂（非结晶性PET共聚物）层5而形成的两层结构。第二热塑性树脂层5在形成无纺布8（网状体的第1例）时作为与狭缝网状物6或后述的狭缝网状物6’一起经纬层叠时的网状物相互间的粘接层发挥作用。
图14所示的局部放大图与图4示出的局部放大图对应、显示图3和图4示出的狭缝网状物6的变形例。
对于该变形例（狭缝网状物6’）与狭缝网状物6的不同点进行说明。
图14所示的狭缝网状物6’具有对第一热塑性树脂（PET）层（主层）4’的一面赋予第二热塑性树脂（非结晶性PET共聚物）层5’而形成的两层结构。第二热塑性树脂层5’在形成无纺布8（网状体的第1例）时作为与裂口网状物1或裂口网状物1’一起经纬层叠时的网状物相互间的粘接层发挥作用。
图15所示的单轴取向带7’是图5示出的单轴取向带7的变形例。
对于该变形例（单轴取向带7’）与单轴取向带7的不同点进行说明。
图15所示的单轴取向带7’具有对第一热塑性树脂（PET）层（主层）4”的一面赋予第二热塑性树脂（非结晶性PET共聚物）层5”而形成的两层结构。第二热塑性树脂层5”在形成无纺布9（网状体的第2例）时作为经纬层叠单轴取向带7’时的带相互间的粘接层发挥作用。另外，第二热塑性树脂层5”在形成织布10（网状体的第3例）时作为编织单轴取向带7’时的带相互间的粘接层发挥作用。
根据本实施方式，构成单轴取向体（裂口网状物1、1’，狭缝网状物6、6’，以及单轴取向带7、7’）的粘接层的第二热塑性树脂5、5’、5”是非结晶性PET共聚物。由此，能够在主层（PET）的熔点以下下使单轴取向体的粘接层彼此粘接，因而能够使单轴取向体的取向性保持良好地形成网状体（无纺布8、9，以及织布10）。
另外，根据本实施方式，由于单轴取向体（裂口网状物1、1’，狭缝网状物6、6’，以及单轴取向带7、7’）的主层由PET构成，因此与主层由聚乙烯或聚丙烯构成的情况相比，网状体（无纺布8、9，以及织布10）可具有较高的耐热性。
另外，根据本实施方式，单轴取向体（裂口网状物1、狭缝网状物6以及单轴取向带7）具有对主层（PET）的两面赋予粘接层（非结晶性PET共聚物）而形成的三层结构。由此，可将单轴取向体一侧的粘接层作为经纬层叠或编织单轴取向体用的粘接部、同时可将另一侧的粘接层作为与其他的构件（例如上述的棉织物等）的粘接部，因而可以不使用粘接剂等地进行单轴取向体彼此间的一体化及与其他的构件的粘接。
另外，根据本实施方式，在经纬层叠或编织单轴取向体之前，对单轴取向体的表面（由非结晶性PET共聚物形成的粘接层）实施电晕处理。由此，粘接层的润湿性提高且粘接性提高，因而网状体能够确保足够的强度（尤其是剥离强度）。
另外，根据本实施方式，针对于非结晶性PET共聚物的二元醇成分，将共聚单体与乙二醇的比率（摩尔比）优选设为9：91～50：50、进一步优选设为15：85～30：70。换而言之，将非结晶性PET共聚物的二元醇成分中共聚单体的比率（摩尔比）优选设为9摩尔%～50摩尔%、进一步优选设为15摩尔%～30摩尔%。由此，能够确保粘接层的良好粘接性及割纤（开纤处理）的良好操作性。
产业上的可利用性
根据本发明，聚对苯二甲酸乙二醇酯制的网状体可具有良好的取向性并且可具有较高的耐热性，因而产业上的可利用性大。
附图标记说明
1、1’ 裂口网状物
1a 取向轴
2 干纤维
3 支纤维
4、4’、4” 第一热塑性树脂层
5、5’、5” 第二热塑性树脂层
6、6’ 狭缝网状物
6a 取向轴
7、7’ 单轴取向带
7a 取向轴
8 无纺布
9 无纺布
10 织布
14 多层薄膜
15 烘箱
16 开纤器
17 热处理部
18 卷取体
110 裂口网状物（纵向网状物）
110a 原卷抽出辊
111 展宽工序
112 层叠工序
113 热压接工序
113a 热滚筒
113b、113c 镜面辊
114 卷取体
210 裂口网状物（横向网状物）
210a 原卷抽出辊
211 展宽工序
314 多层薄膜
315 横向开缝工序
316 横向取向工序
317 热压接工序
317a 热滚筒
317b、317c 镜面辊
318 卷取体
410 裂口网状物（纵向网状物）
410a 原卷抽出辊
411 展宽工序
500 电晕处理装置
501 高频电源
502 控制器
503 电极
504 处理辊

Claims (3)

1.一种网状体，其特征在于，该网状体是隔着粘接层将单轴取向体以取向轴交叉的方式经纬层叠而形成的，所述单轴取向体是对由第一热塑性树脂形成的主层的至少一面赋予由在低于所述第一热塑性树脂的熔点的温度下具有热封性的第二热塑性树脂形成的粘接层而形成的，
所述第一热塑性树脂是聚对苯二甲酸乙二醇酯，
所述第二热塑性树脂是非结晶性聚对苯二甲酸乙二醇酯共聚物，
关于所述非结晶性聚对苯二甲酸乙二醇酯共聚物的二元醇成分，共聚单体与乙二醇的摩尔比为为15：85～30：70，
所述共聚单体包含新戊二醇或1,3-丙二醇，
构成所述网状体的至少一个所述单轴取向体是将包含所述主层和所述粘接层的多层薄膜沿着取向轴的轴向单轴拉伸后沿着该轴向割纤并使其展宽而形成的。
2.根据权利要求1所述的网状体，其特征在于，所述单轴取向体是对所述主层的两面赋予所述粘接层而形成的。
3.根据权利要求1所述的网状体，其特征在于，在所述经纬层叠之前，对所述粘接层实施电晕处理。
CN201280049306.5A 2011-10-06 2012-06-26 网状体 Expired - Fee Related CN103857525B (zh)

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