CN101541500B - 热压用缓冲材料及其制造方法 - Google Patents

热压用缓冲材料及其制造方法 Download PDF

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CN101541500B
CN101541500B CN200780043920XA CN200780043920A CN101541500B CN 101541500 B CN101541500 B CN 101541500B CN 200780043920X A CN200780043920X A CN 200780043920XA CN 200780043920 A CN200780043920 A CN 200780043920A CN 101541500 B CN101541500 B CN 101541500B
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rubber
cotton cloth
fiber
cushioning material
heat press
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CN101541500A (zh
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吉田晃
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Yamauchi Corp
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Yamauchi Corp
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Abstract

本发明提供一种热压用缓冲材料(1)，具备由织布和在该织布中含浸的橡胶形成的纤维-橡胶复合材料层。织布的经纱为并捻纱，纬纱是由玻璃纤维形成的变形纱。纤维-橡胶复合材料层在内部具有空隙。

Description

热压用缓冲材料及其制造方法
技术领域
本发明涉及热压用缓冲材料及其制造方法。进一步详细地说，本发明涉及在制造覆铜箔层压板、柔性印刷基板、多层板等印刷基板、IC卡、液晶显示板、陶瓷层压板等精密仪器构件(以下，本发明中称为“层压板”)的工序中，将对象产品冲压成形或热压接时使用的热压用缓冲材料及其制造方法。
背景技术
在制造印刷基板等层压板的过程中，在冲压成形、热压接的工序中，如图10所示，使用将作为冲压对象物的层压板材料12夹持在作为加热加压机构的热板13、13之间，并施以一定的压力和热的方法。为了得到精度良好的成型品，在热压中，需要使施加给层压板材料12的热和压力全面均匀化。出于这样的目的，在使平板状的缓冲材料11介于热板13和层压板材料12之间的状态下进行热压。
在这里，作为缓冲材料11所要求的一般特性，可以举出如下特性：吸收热板13、层压板材料12所具有的凹凸的缓冲性、用于在整个冲压面内从热板13向层压板材料12均匀传递温度和压力的面内均匀性、用于从热板13向层压板材料12高效地传递热的热传递性、能耐受冲压温度的耐热性等。
以往，作为热压用缓冲材料11，大多使用层叠3～20张左右的牛皮纸或棉绒纸的纸制材料。对于纸制的缓冲材料而言，除了价格低廉之外，在缓冲性、面内均匀性以及热传递性的方面，还具备平衡良好的物性。认为其原因在于，纸中含有的适度空隙对缓冲性有利；另外，纸的构成纤维大致在平面方向上取向，这对面内均匀性有利；进而，每一张的厚度为0.1～1mm左右，厚度较薄，这对热传递性有利。但是，纸制的缓冲材料在冲压之后没有空隙的恢复力，进而构成纤维发生热劣化，所以存在无法在多次冲压中反复使用的缺点。
与此相对，作为可以反复使用的热压用缓冲材料，提出了将有机或无机纤维以粘合剂接合而成的材料、橡胶、无纺布、织布、它们的层叠体等各种材料。
在特开平4-361012号公报中公开了一种热压用缓冲材料，将网状物(web)和底布交替层叠，在对其进行针刺而得到的针刺无纺布中含浸耐热性树脂，进而实施加热加压处理，以使其密度为0.6g/cm3～0.9g/cm3。在这里，作为无纺布的原材料，使用间位芳香族聚酰胺纤维、麻(苎麻)以及聚酯，作为耐热性树脂，使用硅酮橡胶、乙烯丙烯酸橡胶以及EPDM。根据特开平4-361012号公报的构成，通过将密度规定在特定范围，即便在多次冲压中反复使用的情况下，也可以获得经时稳定的缓冲性。
但是，在特开平4-361012号公报中使用的这种针刺无纺布，是通过对网状物进行针刺并使纤维进行机械缠绕，所以网状物自身的密度不均匀。为此，使用针刺无纺布的热压用缓冲材料，存在用于均匀传递温度和压力的面内均匀性变差的缺点。另外，针刺无纺布需要在厚度方向上对网状物进行针刺并使纤维缠绕，由此无法将厚度减小太多。例如，在上述公报中记载的热压用缓冲材料中，最终厚度为3.3mm～3.7mm左右，所以存在热传递性也变差的缺点。
进而，上述公报中记载的热压用缓冲材料，在针刺无纺布含浸耐热性树脂之后，实施加热加压处理，所以空隙率减小，缓冲性也不大好。即，上述公报中记载的热压用缓冲材料为了达到即便在反复使用的情况下，也能使物性经时稳定的目的，牺牲了面内均匀性、热传递性以及缓冲性。
在特开平4-197299号公报中公开了采用耐热性细纱制成3～5层的多层织布的冲压缓冲材料、以及用耐热性树脂溶液对其进行含浸处理得到的冲压缓冲材料。织布通常具有目付(面积重量)精度好的优点，相反却存在缓冲性低的缺点。与此相对，在特开平4-197299号公报中记载的缓冲材料为多层织布结构，由此使其具有缓冲性。但是，织布与棉状的无纺布相比，在本质上缓冲性低，即便是采用多层织布结构的情况下，也基本不指望缓冲性的提高。另外，在使用有机纤维作为织布的原材料的情况下，存在反复使用时发生尺寸变化而欠缺稳定性的问题。另一方面，在使用了玻璃纤维等无机纤维的情况下，形状稳定性出色，但由于冲压会发生纤维的折断或破损，所以存在无法反复使用的问题。
发明内容
本发明的目的在于，提供一种具有缓冲性、面内均匀性、热传递性均出色的特性，且即便在多次热压中反复使用的情况下也能维持良好的缓冲性，尺寸稳定性以及耐久性也出色的热压用缓冲材料及其制造方法。
基于本发明的热压用缓冲材料具有：由织布和含浸于上述织布中的橡胶构成的纤维-橡胶复合材料层，所述织布在经纱及纬纱中的至少任意一方使用由玻璃纤维形成的变形纱。纤维-橡胶复合材料层在内部具有空隙。
变形纱(texturized yarn)是构成玻璃纤维纱线的短纤维彼此不是平行状态，而是以缠绕、无序状态并丝的占有面积大的纱线。换言之，变形纱具有毛纱那样的蓬松性，所以使用了变形纱的织布与普通的织布不同，在内部含有大量空隙。
根据基于本发明的热压用缓冲材料，含浸于织布中的橡胶适度地进入到变形纱所具有的空隙以及织眼的空隙中，而且不完全塞满空隙，而维持某种程度的空隙性，所以发挥良好的缓冲性。进而，对变形纱进行编织，采用织布的形状，所以与无纺布相比，目付精度良好，面内均匀性出色。另外，由于采用织布的形状，所以可以使厚度小于无纺布，可以使热传递性出色。
玻璃纤维具有耐热性，也很少由热引起尺寸变化，所以热压用缓冲材料即便在多次热压中反复使用的情况下，尺寸稳定性也良好。含浸于织布中的橡胶不仅会保护玻璃纤维，而且还接合纤维的接点。由此，本发明的缓冲材料，即便在多次热压中反复使用的情况下，也不会产生玻璃纤维的破损，且耐久性良好。此外，由于纤维的接点被橡胶接合，再加上橡胶的弹性，可以防止织布的所谓塌陷(ヘタリ)，即便在多次热压中反复使用的情况下，也可以持续内部的空隙性，维持良好的缓冲性。
其中，作为本说明书中使用的“变形纱”的种类，可以举出膨体纱(bulked yarn)、短纤维纱(staple yarn)、条子纱(sliver yarn)等。膨体纱是通过喷射气体等进行变形加工(膨松整理)得到的纱线。短纤维纱是对棉状的玻璃短纤维进行纺纱而制成纱线状的纱。条子纱是对未加捻的变形的短纤维(条子：sliver)加捻而制作的纱线。
橡胶相对于构成纤维-橡胶复合材料层中的织布的纤维的体积比优选为5～50％。当橡胶相对于织布的构成纤维的体积比为该范围时，可以成为如下所述的状态，即含浸于织布的橡胶适度地进入变形纱具有的空隙以及织眼的空隙中，而且不完全塞满空隙，从而维持某种程度的空隙性。如果橡胶的体积比小于5％，当在多次热压中反复使用时，有可能发生塌陷，缓冲性降低，另外，有可能玻璃纤维发生破损，耐久性消失。另一方面，当橡胶相对于织布的构成纤维的体积比大于50％时，橡胶过度进入到变形纱的空隙中，成为空隙率低的状态，缓冲材料自身的缓冲性有可能降低。更优选橡胶相对于织布的构成纤维的体积比为5～35％。
为了使热压用缓冲材料维持良好的缓冲性，优选使纤维-橡胶复合材料层的空隙率为20～65％的范围。更优选空隙率的范围为25～65％。
可以在构成织布的经纱以及纬纱中的任意一方中使用变形纱，也可以双方都使用变形纱。在经纱以及纬纱中的任意一方是变形纱的情况下，另一方可以由通常的单纱或并捻纱构成。织布的层结构可以是单层织布，也可以是多层织布。作为编织方法，有平纹编织、斜纹编织、其它编织方法，并不被特定的编织方法限定。通过适当选择纱线的支数、编织密度、编织方法等，可以调节织布的目付精度、空隙性。
优选变形纱是膨体纱。膨体纱是变形纱的一种，通过气流喷射加工进行单纱的开纤或并捻纱的膨松，是具有毛纱那样的蓬松性的加工纱线。使用了膨体纱的织布的空隙率高，能够适度含浸橡胶。由使用玻璃纤维的膨体纱而得到的织布、含浸于该织布的橡胶、和内部的空隙构成的纤维-橡胶复合材料层，在缓冲性、面内均匀性、热传递性方面均出色，即便在热压中反复使用的情况下，也能维持良好的缓冲性，尺寸稳定性以及耐久性也出色，所以可以很好地作为热压用缓冲材料使用。
作为在使用了玻璃纤维的变形纱的织布中含浸的橡胶，优选使用从氟橡胶、EPM、EPDM、氢化丁腈橡胶、硅酮橡胶、丙烯酸橡胶以及丁基橡胶中选择的一种橡胶或两种以上的混合物。这些橡胶的耐热性均出色。其中，氟橡胶在耐热性、强度等物性方面特别出色，所以最优选。
基于本发明的热压用缓冲材料，可以将一层以上的由纤维-橡胶复合材料形成的层、和一层以上的选自织布、无纺布、纸、膜、箔、片以及板中的一种以上层叠一体化而构成。当然，热压用缓冲材料也可以由纤维-橡胶复合材料层的单体构成。
基于本发明的热压用缓冲材料的制造方法，包括：准备织布的工序，所述织布在经纱以及纬纱中的至少任意一方使用由玻璃纤维形成的变形纱；使未硫化橡胶溶液渗透该织布的工序；使渗透到织布中的未硫化橡胶溶液干燥的工序；以及对干燥的未硫化橡胶进行硫化的工序。
通过使渗透到包含变形纱的织布中的未硫化橡胶干燥，溶剂发生挥散，其结果是在纤维-橡胶复合材料层的内部出现空隙。硫化工序可以以非压缩状态和压缩状态的任意一种状态进行。通过这样的方法，可以得到下述的纤维-橡胶复合材料层，即，在织布中含浸的橡胶适度地进入到变形纱具有的空隙以及织眼的空隙中，而且不完全塞满空隙，且维持了某种程度的空隙性。该纤维-橡胶复合材料层能够通过单独或与其它材料层叠一体化，而很好地用作热压用缓冲材料。
在制造结构为层叠纤维-橡胶复合材料和其他材料而成的热压用缓冲材料的情况下，可以粘合硫化后的纤维-橡胶复合材料和其他材料，也可以以层叠有未硫化状态的纤维-橡胶复合材料和其他材料的状态进行冲压硫化，在硫化的同时进行一体化。
附图说明
图1是基于本发明的热压用缓冲材料的一个实施方式的剖面图。
图2是变形纱的示意图。
图3是通常的玻璃纤维的示意图。
图4是表示基于本发明的热压用缓冲材料的其他例子的剖面图。
图5是表示基于本发明的热压用缓冲材料的其他例子的剖面图。
图6是表示基于本发明的热压用缓冲材料的其他例子的剖面图。
图7是表示基于本发明的热压用缓冲材料的其他例子的剖面图。
图8是表示基于本发明的热压用缓冲材料的其他例子的剖面图。
图9是缓冲性测定条件的示意图。
图10是热压的示意图。
具体实施方式
以下，参照附图对本发明的实施方式进行说明。
图1以及图4～图8均表示基于本发明的热压用缓冲材料的实施方式的剖面图。
图1所示的热压用缓冲材料1是由织布和在该织布中含浸的橡胶构成的纤维-橡胶复合材料的单层。构成织布的经纱和纬纱中的至少任意一方使用了由玻璃纤维形成的变形纱。纤维-橡胶复合材料层在内部具有空隙。纤维-橡胶复合材料层的厚度是0.5mm～5mm左右，为片状。
图2表示适合用作热压用缓冲材料的构成材料即变形纱的玻璃纤维的膨体纱2。膨体纱2通过气流喷射加工进行单丝的开纤或并捻纱的膨松，是具有毛纱那样的蓬松性的加工纱线。就膨体纱2而言，纱线自身含有大量空隙，所以可以适度含浸橡胶。
图3表示作为通常的玻璃纤维纱线3的单丝或并捻纱。作为纤维-橡胶复合材料层中的织布，可以是经纱以及纬纱中的任意一方使用膨体纱2，另一方使用通常的玻璃纤维纱线3编织而成的材料；还可以是经纱以及纬纱双方都使用膨体纱2编织而成的材料。织布使用单层编织或多层编织的织布。作为使用了玻璃纤维的膨体纱的织布，市售有例如尤尼吉可株式会社制的A305、A330、A400、A415、A450、A500、T330、T540、T790、T860、T900、日东纺织株式会社制的KS4010、KS4155、KS4325等。
在本发明的一个实施方式中，织布的经纱使用并捻纱3，纬纱使用变形纱(例如膨体纱)2。橡胶适度地进入到变形纱2内的间隙以及织眼的间隙中。纤维-橡胶复合材料层1在进入到变形纱2内以及织眼中的橡胶中具有大量空隙。
纤维-橡胶复合材料层1具有织布和在该织布中含浸的橡胶。优选以使得橡胶相对于织布的构成纤维的体积比为5％～50％的方式，使织布整体的间隙中含浸橡胶。更优选的橡胶的体积比为5～35％。另外，在纤维-橡胶复合材料层1中，织布的间隙未被橡胶完全塞满，具有某种程度的空隙性。纤维-橡胶复合材料层的空隙率优选为20～65％，更优选为25～65％。
作为在织布中含浸的橡胶，优选从氟橡胶、EPM、EPDM、氢化丁腈橡胶、硅酮橡胶、丙烯酸橡胶以及丁基橡胶中选择的一种橡胶或两种以上橡胶的混合物。
图4～图8所示的热压用缓冲材料是将图1所示的纤维-橡胶复合材料层1和其他材料层叠一体化得到的结构。
图4所示的热压用缓冲材料，在纤维-橡胶复合材料层1的表面背面层叠一体化有表层4。设置表层4的目的在于，对热压用缓冲材料主要赋予脱模性。作为表层4的材料，可以使用合成树脂膜、在由织布形成的基材的表面侧涂布脱模性树脂得到的材料等。
图5所示的热压用缓冲材料，借助粘合材料层5层叠有两层纤维-橡胶复合材料层1。在上下表面层叠一体化有表层4。作为粘合材料层5，可以使用在由织布形成的基材的上下两面涂布了耐热性的橡胶系粘合材料得到的材料等。
图6所示的热压用缓冲材料，在纤维-橡胶复合材料层1的上下两面层叠橡胶层6，进而在其上下两面层叠一体化有表层4。作为橡胶层6，可以使用氟橡胶、EPM、EPDM、氢化丁腈橡胶、硅酮橡胶、丙烯酸橡胶、丁基橡胶等耐热性橡胶。其中，从耐热性、强度等观点出发，优选氟橡胶。
图7所示的热压用缓冲材料，是由位于厚度方向中央的加强布层7、位于其上下两面的橡胶层6、进一步位于橡胶层6的上下两面的纤维-橡胶复合材料层1、和进一步位于上下最表面的表层4构成。
图8所示的热压用缓冲材料，是由位于厚度方向中央的无纺布层8、位于其上下两面的粘合材料层5、进一步位于粘合材料层5上下的纤维-橡胶复合材料层1、和进一步位于上下的最表面的表层4构成。作为无纺布层8，可以使用由芳香族聚酰胺、聚对苯亚基苯并二噁唑(polybenzazole)等耐热性纤维制成的针刺无纺布。
纤维-橡胶复合材料层1的制造方法包括：准备经纱以及纬纱中的至少任意一方使用了由玻璃纤维形成的变形纱的织布的工序、使未硫化橡胶溶液渗透该织布的工序、使渗透到织布中的未硫化橡胶溶液干燥的工序、和对干燥的未硫化橡胶进行硫化的工序。
关于未硫化橡胶溶液，可以按照使固态成分浓度为10％～50％左右，将未硫化橡胶溶解在乙酸乙酯、乙酸正丁酯、甲基乙基酮等溶剂中，从而进行制备。
对使用了玻璃纤维的变形纱而得的织布，涂敷或浸渍未硫化橡胶溶液，由此使未硫化橡胶溶液充分渗透织布。根据需要，用辊等挤压渗透有未硫化橡胶溶液的玻璃砂纸，调节未硫化橡胶溶液的含浸量。
接着，使渗透有未硫化橡胶溶液的织布干燥，除去橡胶的溶剂。此时，在含浸有未硫化橡胶的织布的内部出现空隙。
接着，只要以160℃～250℃的温度对渗透有未硫化橡胶的织布加热15分钟～10小时，使橡胶硫化，就可以得到纤维-橡胶复合材料层1。橡胶的硫化可以以非压缩状态和压缩状态的任意状态进行。
在制造如图4～图8所示的、结构为层叠有纤维-橡胶复合材料层1和其他材料而成的热压用缓冲材料的情况下，可以将硫化后的纤维-橡胶复合材料和其他材料粘合，还可以以层叠有未硫化状态的纤维-橡胶复合材料和其他材料的状态进行冲压硫化，在硫化的同时进行一体化。
基于本发明的热压用缓冲材料，在印刷基板等层压板的制造过程中，在进行冲压成形、热压接时，与以往一样，可以使用图10所示的方法。即，在使热压用缓冲材料11介于热板13和层压板材料12之间的状态下，进行热压，由此可以使施加给作为冲压对象物的层压板材料12的热和压力全面均匀化。
实施例
样品1～9
作为织布，使用的是使用了膨体纱的玻璃织布“T860”(尤尼吉可株式会社制)。就该织布而言，纬纱是对由3200根E玻璃纤维(纤维直径6μm)构成的支数为305tex的并捻纱进行变形加工得到的膨体纱，经纱是由1600根E玻璃纤维(纤维直径6μm)构成的支数为135tex的未经变形加工的并捻纱，将经纱和纬纱织造成双层织物而得到的。该织布的重量为850g/m2，厚度为1.02mm，空隙率为67％。另一方面，准备在以质量比1∶1的比例混合乙酸丁酯和甲基乙基酮得到的溶剂中以规定浓度溶解未硫化氟橡胶而得到的未硫化氟橡胶溶液。各未硫化氟橡胶溶液的固态成分比例如表1所示。在将玻璃织布浸渍到各未硫化氟橡胶溶液中之后，分别用两根辊进行挤压。接着，使渗透有未硫化氟橡胶溶液的各玻璃织布充分干燥，从而除去溶剂。
接着，分别在样品1的玻璃织布以及样品2～9的含浸有未硫化氟橡胶的玻璃织布的上下的面上层叠了表层材料。表层材料使用通过如下所示的方法形成的材料，即以厚度为0.2mm的玻璃布为基材，在粘合面侧涂敷未硫化氟橡胶的粘合剂，在表面侧涂敷聚酰亚胺树脂，由此得到。在该层叠状态下，进行温度180℃、加压2MPa、60分钟的冲压，对在织布中含浸的未硫化氟橡胶以及在表层材料上涂敷的粘合剂进行硫化。如此，得到结构为层叠一体化有纤维-橡胶复合材料和表层的样品1～9的热压用缓冲材料。
[表1]
Figure G200780043920XD00101
样品10
样品10除了使用未采用变形纱的通常织布作为玻璃织布这一点之外，是与样品2相同的热压用缓冲材料。即，作为织布，使用如下所示的玻璃织布“A710”(尤尼吉可株式会社制)，该玻璃织布“A710”是在经纱以及纬纱中使用由2400根E玻璃纤维(纤维直径9μm)构成的支数为405tex的未经变形加工的并捻纱而织造成斜纹织布而成。该织布的重量为708g/m2，厚度为0.60mm，空隙率为53.5％。
准备在以质量比1∶1的比例混合乙酸丁酯和甲基乙基酮得到的溶剂中溶解固态成分浓度为14.2％的未硫化氟橡胶而成的溶液。在将玻璃织布浸渍到未硫化氟橡胶溶液中之后，用两根辊进行挤压，随后使其充分干燥。接着，在含浸有未硫化氟橡胶的玻璃织布的上下的面上，以与样品2相同的方法将与样品2相同的表层材料层叠一体化，得到结构为层叠一体化有纤维-橡胶复合材料和表层的热压用缓冲材料。
样品11
样品11使用由粗2d、纤维长度为51mm的间位系芳香族聚酰胺纤维“Conex”(帝人株式会社制)的网状物构成的针刺无纺布。该无纺布是在织眼已打开的玻璃布上涂布未硫化氟橡胶，制成粘合性底布，在该粘合性底布的两面层叠上述网状物，实施针刺而制成。无纺布的重量为350g/m2，厚度为2.0mm，空隙率为87.3％。接着，在该无纺布的上下两面上，以与样品2相同的方法将与样品2相同的表层材料层叠一体化，得到结构为层叠一体化有针刺无纺布和表层的热压用缓冲材料。
比较试验
对各样品的反复缓冲性进行测定。参照图9说明缓冲性的测定条件。首先，向温度210℃的热板之间投入样品，在2分钟的预热之后，以1mm/分钟的压缩速度自0MPa加压至1MPa(a)。接着，以加压1MPa的状态保持20分钟(b)。接着，以1mm/分钟的压缩速度自1MPa升压至4MPa(c)。接着，在加压4MPa的状态下保持20分钟之后，解除加压(d)。将(a)-(b)-(c)-(d)作为一个冲压循环。
在该冲压循环中，以在(c)即自1MPa升压至4MPa期间发生的样品的厚度减少量作为缓冲性的指标。另外，反复进行该冲压循环，测定缓冲性是如何变化的。关于各样品，将初次冲压、冲压1次后、冲压10次后、冲压50次后以及冲压100次后的缓冲性示于表2。
[表2]
Figure G200780043920XD00121
综上，参照附图对本发明的实施方式进行了说明，但本发明并不限于图示的实施方式。对于图示的实施方式，在与本发明相同的范围内，或者等同的范围内，可以进行各种修正或变形。

Claims (9)

1.一种热压用缓冲材料，具有由织布和含浸于所述织布中的橡胶所构成的纤维-橡胶复合材料层，所述织布在经纱及纬纱中的至少任意一方使用由玻璃纤维形成的变形纱，
在所述纤维-橡胶复合材料层的内部具有空隙，
所述纤维-橡胶复合材料层中的所述橡胶相对于构成所述织布的纤维的体积比为5～50％。
2.根据权利要求1所述的热压用缓冲材料，其中，所述纤维-橡胶复合材料层中的所述橡胶相对于构成所述织布的纤维的体积比为5～35％。
3.根据权利要求1所述的热压用缓冲材料，其中，所述纤维-橡胶复合材料层的空隙率为20～65％。
4.根据权利要求1所述的热压用缓冲材料，其中，所述经纱以及纬纱两者都是变形纱。
5.根据权利要求1所述的热压用缓冲材料，其中，所述织布经单层编织或多层编织而成。
6.根据权利要求1所述的热压用缓冲材料，其中，所述变形纱是膨体纱。
7.根据权利要求1所述的热压用缓冲材料，其中，所述橡胶是从氟橡胶、EPM、EPDM、氢化丁腈橡胶、硅酮橡胶、丙烯酸橡胶以及丁基橡胶中选择的一种橡胶或两种以上橡胶的混合物。
8.根据权利要求1所述的热压用缓冲材料，其中，将一层以上的由所述纤维-橡胶复合材料形成的层、和一层以上的由选自织布、无纺布、纸、膜、箔、片以及板中的一种以上形成的层层叠一体化而成。
9.一种权利要求1所述的热压用缓冲材料的制造方法，包括：
准备织布的工序，所述织布在经纱以及纬纱中的至少任意一方使用由玻璃纤维形成的变形纱；
使未硫化橡胶溶液渗透所述织布的工序；
使渗透到所述织布中的所述未硫化橡胶溶液干燥的工序；以及对干燥的未硫化橡胶进行硫化的工序。
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