CN1050088C - 制造汽车用密封条的方法 - Google Patents

制造汽车用密封条的方法 Download PDF

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CN1050088C
CN1050088C CN94106514A CN94106514A CN1050088C CN 1050088 C CN1050088 C CN 1050088C CN 94106514 A CN94106514 A CN 94106514A CN 94106514 A CN94106514 A CN 94106514A CN 1050088 C CN1050088 C CN 1050088C
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sealing strip
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matrix resin
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宫川直久
加藤胜久
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Tokiwa Chemical Industries Co Ltd
System Technical Co Ltd
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    • B60J10/70—Sealing arrangements specially adapted for windows or windscreens
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

一种制造汽车用密封条的方法，其中密封条体设有在与车门玻璃板形成接触的支座部分上摩擦力低且密封性高的防护膜。聚烯烃树脂或其泡沫材料从一挤压制模机中挤入模子以形成密封条体，由基本材料及添加材料组成的混合物从另一制模机中挤入模子以形成防护膜。密封条体和防护膜在所述模子中共同挤压和聚合，且在防护膜的表面上由呈颗粒形状的添加材料形成有多个突起的粗糙表面。

Description

制造汽车用密封条的方法
本发明涉及一种用以制造装在与汽车上的门窗玻璃板形成接触的车身面板或车门面板上的密封条的方法，更特别地是涉及一种制造一种密封条的方法，其中一层摩擦力低且密封性加大的防护膜与密封条体一起整体地挤压成形。
通常，已知的制造这类汽车用密封条的方法包括下述步骤，即由有柔性、回弹性和低摩擦力的合成橡胶或热塑性弹性体形成一可与玻璃板接触的支座部分，从而保持了水密性并使玻璃板的开启及关闭运动进行平稳。但是，在这种密封条的制造方法中，形成支座部分的这类合成橡胶或热塑性弹性体会引起一个问题，即如果它经受一轻微的擦拭作用，就有可能易受损害，并且它的外表在与诸如无色汽油等溶剂接触时可能会易于粗糙化并易于开裂。
还已知另外一种制造密封条的方法，其中所述方法包括以下步骤，即在密封条的支座部分上熔化尿脘树脂或尼龙用以防止合成橡胶或热塑性弹性体强度的降低，从而形成密封条的支座部分。但是，在这种密封条的制造方法中存在一定的缺陷，即增加的摩擦阻力可能会阻碍玻璃板平稳的开启和关闭，并且由于加热及熔化尿脘树脂和尼龙的步骤必须单独于模制密封条体的步骤进行，因此使制造过程变得昂贵且麻烦。
此外，还已知另一种密封条的制造方法，其中，所述方法包括下述步骤，即将含钼的合成橡胶带与密封条的支座部分附着地熔接从而提高后者的滑动特性。但是，在这种密封条的制造方法中，在支座部分上粘结合成橡胶带的步骤不仅非常困难和麻烦，而且还会引起下述问题，即合成橡胶带在密封条的非平直部分(如弯曲的区域或拐弯的区域)的粘接可能会没有足够的强度。
本发明的目的在于提供一种制造汽车用密封条的方法，其中，在密封条体挤压成形时，使防护膜同步地挤压成形且与密封条体一起整体地聚合，由此可在与车门玻璃板形成接触的支座部分上形成摩擦小的有一定粗糙度及增大的密封性的防护膜。
根据本发明的用于制造汽车用密封条的方法包括以下步骤，即：在一挤压制模机中插入并熔化烯烃聚合基体树脂或它的泡沫材料以形成一有一与玻璃板形成接触的支座部分的密封条体；在另一挤压制模机中插入并熔化一混合物用以在密封条体的支座部分上形成一防护膜，所述混合物包括一由粘度低且流动性好的烯烃聚合基体树脂组成的基本材料和一由粘度高且流动性差的处于颗粒或晶粒形状的烯烃聚合基体树脂组成的添加材料；以及将用于制成密封条体的烯烃聚合基体树脂或它的泡沫材料和用于制成防护膜的包括基本材料和添加材料的混合物从两台挤压制模机中挤入模子并使之聚合。
在密封条体和防护膜的共同挤压成形的过程中，由于用于制成密封条体的烯烃聚合基体材料或其泡沫材料和用于形成防护膜的基本材料的低粘度烯烃聚合基体树脂有相溶性，因此在这两类材料之间产生强大而整体地聚合。另外，由于形成防护膜的添加材料的烯烃聚合基体树脂的颗粒或晶粒有高的粘度和减小的流动性，因此它们可形成有多个突起的粗糙表面。
图1是表示用本发明的方法制造的密封条在用于汽车的相应部分上时的透视图；
图2是沿图1中的线A-A截取的俯视截面图；
图3是沿图1中的线B-B截取的俯视截面图；
图4是局部剖开的主视图，表示根据本发明制造并安装在汽车车身面板上的密封条；
图5是沿图4中的线C-C截取的俯视截面图；
图6是表示根据本发明来制造汽车用密封条的过程的示意图；
图7是制模机和它的模子的放大立视图；
图8是沿图7中的线D-D截取的模子的俯视截面图；并且
图9是沿图7中的线E-E截取的俯视截面图。
下面将参照附图描述根据本发明的制造密封条的方法的一个实施例。
密封条体1由烯烃聚合基体树脂(olefin polymers baseedresin)和它的泡沫材料制成并固定在车身面板7及车门面板13上，安装在汽车车身20上的门窗玻璃6可能与这些面板接触。在图2所示的实施例中，密封条体1包括一形成于密封条体底部的连接部分2和一垂挂在密封条体相对侧的垂直支承条3。连接部分2在其中部设有一支座部分4，玻璃板6与该支座部分接触。垂直支承条3在其端部设有一支座部分4，玻璃板6也与该支座部分接触。密封条体1的这些支座部分4在密封条体1挤压成形时与防护膜5一起整体成形，由此可使防护膜5聚合。防护膜5是由基本材料和添加材料组成的混合物在处于颗粒或晶粒构型时形成的，基本材料为具有低粘度和高流动性的烯烃聚合基体树脂，添加材料为具有高粘度和低流动性的烯烃聚合基体树脂。
在图6至图9所示的生产步骤中，将烯烃聚合基体树脂注入制模机21中以形成带有支座部分4的密封条1，玻璃板可与该支座部分接触，并且烯烃聚合基体树脂由热熔化。
由粘度低且流动性高的烯烃聚合基体树脂组成的基本材料和由粘度高且流动性低的烯烃聚合基体树脂组成的添加材料组成一混合物，该混合物处于颗粒状态以在密封条体1的支座部分4之上形成防护膜5。将该混合物注入其它的制模机22并用热使其熔化。
制模机21和22与一个模子23相连，并将形成密封条体1的烯烃聚合基体树脂和由基本材料及添加材料组成的用以形成防护膜5的混合物挤压入模子23中。
模子23包括两个模块23a和23b，模块23a设有一形状与密封条体1相符的导向槽24和一用于防护膜5的流动槽25，模块23b设有一挤压口26，该挤压口有密封条体1和防护膜5的轮廓。用于形成密封条1的导向槽24与挤压口26相连，而用于形成防护膜的流动槽25通过一位于模块23b上的导向凹槽27而与挤压口26连通。
用于形成密封条体1的烯烃聚合基体树脂通过导向槽24排出制模机21，排至模子23中，而用于形成防护膜5的混合物通过导向凹槽27排出挤压制模机22，排至模子23中。密封条体1和防护膜5通过模子23的挤压口26聚化并挤压成形。当密封条体1挤压成形时，防护膜5在密封条体1的上方成形。
在密封条体1和防护膜5一同挤压成形的过程中，用于形成防护膜5的添加材料的烯烃聚合基体树脂可以不象基本材料的聚烯烃树脂那样被完全熔化，而处于一种熔融的形状，这是因为它的粘度大且流动性差的缘故，并且在有保持一定程度的晶粒或颗粒形状时挤压成形。因此，在防护膜5的表面上形成有多个突起的粗糙表面。其后，通过使挤压成形的具有粗糙表面的成品穿过冷却水箱28而使其冷却，并将该成品切成所需的适当尺寸以形成最终的平滑产品A。
用于形成防护膜5的基本材料采用低粘度的聚乙烯，它的熔融液流率大于0.5克/分钟，而呈晶粒及颗粒状态的添加材料采用高粘度的聚乙烯，它的熔融液流率低于0.1克/10分钟。
在根据本发明的用于制造密封条的方法的实施例中，用于形成防护膜的混合物含有10-30％的添加材料，并将添加材料的晶粒或颗粒的尺寸选定在0.005mm-0.15mm的范围内。将注入挤压制模机21中的用以形成密封条体的烯烃聚合基体树脂或此类树脂的泡沫材料加热至190℃，而将注入联合挤压制模机22中的用以形成防护膜的混合物加热至220℃。当防护膜以0.04mm的厚度在位于加热至190℃的模子23中的密封条体上聚合时，在防护膜的表面上形成一令人满意的粗糙表面。
图3所示实施例的密封条体1放在车门面板13的排流框架和皮革部分14之间。密封条体1包括一与玻璃板6相对的直立的垂直支承条11和一从支承条11向外伸出的安装部分8。垂直支承条11设有一上支座部分9和一下支座部分10，每一个支座部分均伸出以形成与玻璃板6的接触。密封条体1的上支座部分9和下支座部分10整体地设有防护膜5。当密封条体1挤压成形时，所述的防护膜5通过采用合成材料，两台挤压制模机21和22以及一个模子23并经过如上所述的制造过程而挤压成形并与密封条体1一起统一地聚合。
图4及图5所示实施例的密封条体1固定在支承框格18的上方，该支承框格设在车身面板7上，与车门玻璃板6的上缘抵靠。密封条体1在上部设有一用于固定支承框格18的安装部分15，并且在下部设有一可与玻璃板6形成抵靠的支座部分16。密封条体1的支座部分16设有防护膜5，该防护膜是在密封条体1挤压成形时通过采用合成材料、两台挤压制模机21和22以及一个模子23并经过如上所述的制造过程而共同挤压成形的并和密封条体1一起统一地聚合。
在根据本发明的制造汽车用密封条的方法中，由于防护膜是在与玻璃板形成接触的支座部分上统一地且固定地聚合，因此防护膜可使用较长的时间，且不会异常地磨蚀或从密封条体上剥落。另外，由于防护膜在密封条体挤压模铸的同时在支座部分上整体地聚合，因此可使生产过程进行得比较容易。此外，由于在防护膜的表面上可形成有多个突起的粗糙表面，因此可由这个粗糙表面来使玻璃板平稳地进行开启和关闭的操作，并可完全保持玻璃板的水密性。

Claims (4)

1.一种用于制造汽车用密封条的方法，包括以下步骤：
在一制模机中插入并熔化烯烃聚合基体树脂或此种材料的泡沫材料以形成一密封条体，该密封条体有一个与玻璃板形成接触的支座部分；
在另一制模机中插入并熔化一混合物用以在密封条体的支座部分上形成一防护膜，所述混合物包括一由粘度低且流动性高的烯烃聚合基体树脂组成的基本材料和一处于晶粒或颗粒形态且由具有高于所述基本材料的粘度和低于所述基本材料的流动性的烯烃聚合基体树脂组成的添加材料；
将用于制成密封条体的烯烃聚合基体树脂或它的泡沫材料以及用于制成防护膜的包括基本材料和添加材料的混合物从两台挤压制模机中挤入模子并使其聚合；以及
由具有晶粒或颗粒形状的添加材料在防护膜的表面上形成有多个突起的粗糙表面。
2.如权利要求1所述的制造汽车用密封条的方法，其特征在于，混合物的基本材料包括低粘度的聚乙烯，它的熔融液流率大于0.5克/10分钟；而添加材料包括高粘度的聚乙烯，它的熔融液流率小于0.1克/10分钟。
3.如权利要求1所述的制造汽车用密封条的方法，其特征在于，所述混合物包含10-30％的添加材料，添加材料的晶粒或颗粒尺寸在0.005mm至0.15mm之间。
4.如权利要求1所述的制造汽车用密封条的方法，其特征在于，将插入一台挤压制模机，用以制成密封条体的烯烃聚合基体树脂加热至190℃，而将插入另一台挤压制模机，用以制成防护膜的混合物加热至220℃，并且所述防护膜以0.04mm的厚度在加热至190℃的模子中与密封条体一起聚合。
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