CN107534163B - 基板一体型垫片的制造方法 - Google Patents

基板一体型垫片的制造方法 Download PDF

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CN107534163B
CN107534163B CN201680027490.1A CN201680027490A CN107534163B CN 107534163 B CN107534163 B CN 107534163B CN 201680027490 A CN201680027490 A CN 201680027490A CN 107534163 B CN107534163 B CN 107534163B
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由井元
浦川哲也
大场健一
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Abstract

一种使用丝网印刷的基板一体型垫片的制造方法，包括如下工序：通过丝网印刷在基板(1)的表面上形成垫片成形用膏的涂布层(31)；以及将涂布层校正部件(8)在预定的高度按压到涂布层(31)上使得涂布层(31)固化。在基板(1)的表面上形成的涂布层(31)的截面形状通过涂布层校正部件(8)来校正，并在该状态下固化涂布层(31)来形成垫片，从而成形具有高精度的截面形状的垫片。

Description

基板一体型垫片的制造方法
技术区域
本发明涉及用于在基板的表面上通过丝网印刷涂布垫片成形材料来制造基板一体型垫片的方法。
背景技术
在具有大量层叠燃料电池单元的构造的燃料电池中，在被层叠的各燃料电池单元中设置有用于密封燃料气体和氧化气体等的密封单元，作为这种密封单元，如图8所示，已知有在作为燃料电池单元的构成部件的隔板等基板1的表面上一体地成形了由上表面平坦的橡胶弹性体(橡胶材料或具有橡胶状弹性的合成树脂材料)构成的垫片2的基板一体型垫片10。另外，已知有将这样的扁平垫片通过丝网印刷来成形，并与山形隆起形状的密封突脊或筋肋(bead)组合使用(参照下述专利文献1、2)。
并且，为了通过丝网印刷来成形这种基板一体型垫片10，如图9所示，首先，在由不锈钢网等构成的丝网101的下面侧一体地设置掩模102的构造的丝网版100的下表面定位接触基板1，在该掩模102中形成有与垫片的平面形状对应的预定的印刷图案的膏涂布用开口102a，
通过刮板200的行进将供应到丝网版100上的由垫片成形用的未交联橡胶材料构成的膏300挤压到掩模102的膏涂布用开口102a并使其附着在基板1的表面上之后，通过使基板1从丝网版100分离，如图10所示，在基板1的表面以预定的印刷图案形成膏涂布层300a。然后，通过热等使该涂布层300a交联固化，如图8所示，成形垫片2的同时使其与基板1成一体化。
在先技术文献
专利文献
专利文献1：日本特开第5310976号公报
专利文献2：日本特开2004-63295号公报
发明内容
发明所要解决的技术问题
然而，在上述的丝网印刷中，在将基板1从丝网版100分离的过程中涂布层300a容易坍塌，因此，涂布层300a的截面形状实际上如图11的(A)或(B)所示那样变成曲面的情况较多。而且，在这种情况下，涂布层300a的高度h的变化也很大，因此担心以这种截面形状成形的垫片的密封性会变得不稳定。
本发明是鉴于上述方面完成的，其技术问题在于，在使用丝网印刷制造基板一体型垫片时，能够成形具有高精度的截面形状的垫片。
解决技术问题的手段
本发明为了解决上述技术问题，采用如下手段。
即，本发明涉及的基板一体型垫片的制造方法，其特征在于，包括如下工序：通过丝网印刷在基板的表面上形成垫片成形用膏的涂布层；将涂布层校正部件在预定的高度按压到所述涂布层上使得所述涂布层固化(权利要求1)。
根据上述方法，通过丝网印刷被涂布在基板表面上的垫片成形用膏的涂布层的截面形状通过印刷之后按压在所述涂布层上的涂布层校正部件被校正，并且在该状态下所述涂布层固化而变成垫片，因此成形具有高精度的截面形状的垫片。
另外，本发明为了解决上述技术问题，还可以采用如下手段。
即，在上述构成的基板一体型垫片的制造方法(权利要求1)中，其特征在于，垫片成形用膏由紫外线固化型液态橡胶构成，涂布层校正部件由透明板构成，经由所述涂布层校正部件向所述涂布层照射紫外线来进行涂布层的固化(权利要求2)。
根据该方法，由于用于校正涂布层的截面形状的涂布层校正部件由透明板构成，因此能够从该涂布层校正部件的上方向由紫外线固化型液态橡胶构成的涂布层照射紫外线来使其交联固化，从而能够大幅缩短垫片的成形时间。
另外，在上述构成的基板一体型垫片的制造方法(权利要求1或2)中，其特征在于，涂布层校正部件为平板状(权利要求3)。
根据该方法，涂布层的上表面通过涂布层校正部件被整形成平坦，因此可以容易地制造将上表面平坦的垫片与基板的表面一体成形的基板一体型垫片。
发明的效果
根据本发明涉及的基板一体型垫片的制造方法，在使用丝网印刷制造基板一体型垫片时，能够容易地成形具有高精度的截面形状的垫片，从而能够制造出具有优异的密封性的基板一体型垫片。
附图说明
图1是示出在本发明涉及的基板一体型垫片的制造方法的优选实施方式中通过丝网印刷在基板的表面上形成涂布层的过程的说明图。
图2是示出在本发明涉及的基板一体型垫片的制造方法的优选实施方式中通过丝网印刷在基板的表面上形成涂布层的状态的说明图。
图3是示出在本发明涉及的基板一体型垫片的制造方法的优选实施方式中将涂布层校正部件按压在涂布层上的过程的说明图。
图4是示出在本发明涉及的基板一体型垫片的制造方法的优选实施方式中将涂布层校正部件按压在涂布层上以使涂布层固化的工序的说明图。
图5是示出在本发明涉及的基板一体型垫片的制造方法的优选实施方式中将涂布层校正部件按压在涂布层上以使涂布层固化的工序的说明图。
图6是示出在本发明涉及的基板一体型垫片的制造方法的优选实施方式中被成形的基板一体型垫片的说明图。
图7是示出在本发明涉及的基板一体型垫片的制造方法的优选的第二实施方式中将由透明板构成的涂布层校正部件按压在涂布层上并且通过照射紫外线来使涂布层固化的工序的说明图。
图8是示出基板一体型垫片的一个例子的图、(A)是俯视图、(B)是(A)中的B-B'剖视图。
图9是示出在现有技术中通过丝网印刷在基板的表面上形成涂布层的过程的说明图。
图10是示出通过丝网印刷在基板的表面上形成平坦的涂布层的状态的说明图。
图11是示出通过丝网印刷在基板的表面上形成的涂布层的截面形状的例子的说明图。
具体实施方式
以下，参照附图说明将本发明涉及的基板一体型垫片的制造方法应用于图8所示的基板一体型垫片10的制造中的优选实施方式。
在该实施方式中，首先，如图1所示，由丝网印刷装置20在基板1的表面上涂布垫片成形用膏30。具体而言，丝网印刷装置20具备：可动工作台3，该可动工作台3在其上表面能够定位固定基板1，并且通过致动器(未图示)进行升降；丝网版4，该丝网版4配置在该可动工作台3的上侧，具有在由不锈钢网等构成的丝网41的下面侧一体地设置掩模42的构造，在该掩模42中形成有与垫片的平面形状对应的预定的印刷图案的膏涂布用开口42a；刮板5，该刮板5以在该丝网版4的上表面滑动的方式行进移动。掩模42的厚度如下设定，如图2所示，由该丝网印刷装置涂布在基板1的表面上的膏涂布层31的高度h1适当高于要成形的垫片2的高度h3(参照图6)。
基板1由角部倒圆的矩形的框状的金属板构成(参照图8)，将该基板1定位设置在可动工作台3上之后，通过使可动工作台3上升，使得基板1抵接于丝网版4的下表面，通过刮板5的行进将供应到丝网版4上的由垫片成形用的未交联橡胶材料构成的膏30挤压到掩模42的膏涂布用开口42a并使其附着在基板1的表面上。
接着，如图2所示，通过使可动工作台3下降，使得基板1从丝网版4分离。在基板1的表面上以预定的印刷图案形成有膏涂布层31。并且该涂布层31由于取下丝网版4时的丝网41和膏涂布用开口42a之间的粘附性所致的剪切作用等，截面形状不稳定，且高度h1高于要成形的垫片的高度。
接着，如图3所示，将通过丝网印刷形成了涂布层31的基板1设置在校正装置40中。校正装置40具备：工作台6，在该工作台6的上表面可定位固定基板1；隔板7，该隔板7以包围该工作台6的上表面上的基板1的设置空间的方式设置；涂布层校正板8，该涂布层校正板8通过致动器(未图示)可载置在隔板7上，由不锈钢板等构成。隔板7的高度h2被设定为相当于要成形的垫片的高度和基板1的厚度之和，因此，定位固定在可动工作台6的上表面的基板1上的涂布层31的高度比隔板7的高度h2高Δh。
然后，将基板1定位固定在工作台6的上表面之后，如图4所示，通过使涂布层校正板8下降并载置固定于隔板7上，将涂布层校正部件8在预定的高度、即因隔板7而距离工作台6的支承高度h2按压到涂布层31上。因此，涂布层31的高度被压下如图3所示的Δh从而校正到高度h3，并且截面形状被整形为使得上表面变得平坦。
接着，如上所述在隔板7上载置固定涂布层校正板8的状态下，将校正装置40送至图5所示的恒温槽50，通过在该恒温槽50内以预定的温度(例如130～150℃)加热预定时间以使涂布层31交联固化。
当涂布层31交联固化(垫片2成形)所需的时间经过之后，将校正装置40送到恒温槽50的外部，并打开涂布层校正板8，则能够取出由基板1和在其表面一体地成形的垫片2构成的基板一体型垫片。如图6所示，该基板一体型垫片10中，垫片2的上表面是平坦的，高度h3是恒定的，并且具有高精度的截面形状。
另外，作为实施例，在100mm×150mm的基板上将由未交联液态橡胶构成的膏通过丝网印刷以印刷宽度(膏涂布用开口的宽度)＝3mm、高度为350μm左右印刷膏涂布层，在通过平板状的涂布层校正板按压该膏涂布层而校正到高度300μm的状态下，放入恒温槽内使其固化制作扁平垫片。然后，观察了成形的垫片的截面形状，确认上表面为高精度的平面状。另外，作为比较例，在未进行涂布层校正板的按压的情况下固化的垫片，观察到高度270～330μm左右的变化，相对于此，在实施例中，高度为290～310μm左右，证实尺寸变化得到了改善。
图7是示出了作为本发明涉及的基板一体型垫片的制造方法的优选的第二实施方式，由透明板构成校正装置40中的涂布层校正板8，将通过丝网印刷形成在基板1上的由紫外线固化型液态橡胶材料构成的涂布层31通过照射紫外线UV来使其固化的工序。
即，第二实施方式是在图1所示的丝网印刷工序中作为垫片成形用膏30使用紫外线固化型液态橡胶材料。然后，如图2所示，通过使基板1从丝网版4分离，将以预定的印刷图案形成膏涂布层31的基板1设置在如图7所示的校正装置40中。该校正装置40除了涂布层校正板8由玻璃等透明板构成之外，具有与上述说明的图3相同的构成。
因此，在校正装置40的工作台6的上表面定位设置形成有由紫外线固化型液态橡胶材料构成的膏涂布层31的基板1之后，通过使涂布层校正板8下降并载置固定于隔板7上，将涂布层校正部件8在因隔板7而距离工作台6的支承高度h2按压到涂布层31上。因此，涂布层31的高度被校正到高度h3，并且截面形状被整形为上表面变得平坦。
然后，在该状态下，如果从涂布层校正板8的上方由紫外线照射装置(未图示)照射紫外线UV，则该紫外线UV透过由透明板构成的涂布层校正板8，通过该能量来使由紫外线固化型液态橡胶材料构成的涂布层31固化。因此，不需要将校正装置40放入恒温槽，而且能够在短时间(例如几十秒)内使涂布层31固化。
在通过照射紫外线UV来使涂布层31交联固化(垫片2成形)所需的时间经过之后，如果打开涂布层校正板8，则能够取出由基板1和在其表面上一体地成形的垫片2构成的基板一体型垫片。并且该基板一体型垫片如图6所示，垫片2的上表面也是平坦的，高度h3是恒定的，并且具有高精度的截面形状。
符号说明
1 基板
2 垫片
4 丝网版
7 隔板
8 涂布层校正板
10 基板一体型垫片
20 丝网印刷装置
30 垫片成形用膏
31 膏涂布层
40 校正装置
50 恒温槽
UV 紫外线

Claims (1)

1.一种基板一体型垫片的制造方法，其特征在于，包括如下工序：
通过丝网印刷在基板的表面上形成垫片成形用膏的涂布层，所述垫片成形用膏由紫外线固化型液态橡胶构成；以及
将涂布层校正部件在预定的高度按压到所述涂布层上，经由所述涂布层校正部件向所述涂布层照射紫外线使得所述涂布层固化，所述涂布层校正部件由平板状的透明板构成。
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