CN103640203A - Eva胶膜挤出机 - Google Patents
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Abstract
本发明涉及一种EVA胶膜挤出机,主要由加热管道和设在所述加热管道端部的挤出器构成,所述加热管道是由罩筒和穿设在所述罩筒内的螺旋输送器构成,所述螺旋输送器的中心轴轴体内充有冷却液,所述外部罩筒表面间隔设有多个加热-冷却单元,每个所述加热-冷却单元内具有紧贴在所述罩筒外表面的电热丝和紧套在所述罩筒外部的冷却管,所述电热丝与冷却管依次并列设置,所述挤出器是由对合的第一模板、第二模板以及扣合在所述第一、第二模板两端的第一端盖和第二端盖组成,所述第一模板和第二模板为良导热体,所述第一、第二模板内也埋设有冷却管,所述冷却管内充有冷却液。
Description
技术领域
本发明涉及一种EVA生产设备,具体涉及一种EVA胶膜挤出机。
背景技术
太阳能电池若直接暴露于空气中,其光电转换效率会很快下降,失去实用价值。因此,太阳能电池的封装材的研究开发就十分重要。为达到与外界隔离的目的,采用透明、耐光老化、粘接性能好、能承受大气变化且具有弹性的乙烯-醋酸乙烯酯共聚物(EVA)胶膜将太阳能电池片包封,并与上下层保护材料粘合在一起,构成太阳能电池组件。
EVA是一种典型的无规高分子化合物,在它的分子结构中,取代基在分子链上的排列不规则,同时分子链中不对称碳原子的构型也不相同,排列也不规则,因此它是一种结晶性较小、极性和柔韧性较高的材料,另外它在加热熔融时具有良好的浸润性,冷却固化时具有良好的挠曲性、抗应力开裂性和粘结性能,是一种较为理想的能用于太阳能电池封装的材料。
EVA成膜采用的是挤压成型工艺,整条生产线通常包括搅拌设备、挤出设备、压膜装置、切边单元以及收、放卷设备,完成混料、上料、挤出、压延、切边、收卷工序。决定成品质量的要素有:原料和配方,热熔挤出工艺,及流延成型工艺控制几个方面,而在流延成型工艺过程中,环境温度湿度也是一个重要环节,适宜的湿度和稳定的温度,可减少膜的拉伸变形,控制膜的张力。
目前,在EVA生产过程中EVA胶粒在加热管道内被溶成熔融状态的胶体。加热管道通常是通过电加热,在电加热容易形成热量堆积,不易对温度进行控制,温度过高或过低均会影响EVA胶膜的质量。
发明内容
本发明要解决的技术问题是:提出一种可以即时快速对加热管道内EVA熔胶温度进行调节的EVA胶膜挤出机。
本发明为解决上述技术问题提出的技术方案是:一种EVA胶膜挤出机,主要由加热管道和设在所述加热管道端部的挤出器构成,所述加热管道是由罩筒和穿设在所述罩筒内的螺旋输送器构成,所述螺旋输送器的中心轴轴体内充有冷却液,所述外部罩筒表面间隔设有多个加热-冷却单元,每个所述加热-冷却单元内具有紧贴在所述罩筒外表面的电热丝和紧套在所述罩筒外部的冷却管,所述电热丝与冷却管依次并列设置,所述挤出器是由对合的第一模板、第二模板以及扣合在所述第一、第二模板两端的第一端盖和第二端盖组成,所述第一模板和第二模板对合后在其接缝处形成有供EVA熔胶流出形成胶膜的间隙通道,所述第一模板和第二模板为良导热体,所述第一、第二模板内也埋设有冷却管,所述冷却管内充有冷却液。
进一步的,还包括分水器,所述冷却管的循环两端连接到分水器,所述分水器的总进液口与总出液口之间设有循环泵和换热装置。
进一步的,还包括控制器和设置在所述挤出机胶膜出口处的胶膜X光测厚仪,所述胶膜X光测厚仪的信号输出端连接到所述控制器,所述控制器的控制端连接到所述循环泵的受控端。
进一步的,所述冷却管在所述第一、第二模板内部呈蜿蜒状敷设,所述循环泵为有刷直流水泵。
本发明的有益效果是:
首先,本发明中的挤出机在螺旋输送轴内充有冷却液之外还在加热管道外部布置有多个加热-冷却单元,可以有选择地开启和关闭前述单元,使对加热管内的温度控制更加趋于精细和线性。从而使生产出的EVA胶膜的质量更稳定,减少了次品率。
其次,本发明中的挤出器创造性的在第一模板、第二模板内埋设有冷却管,并通过分水器将两组冷却管连接组合起来。当EVA熔胶经过挤出器的挤出口形成胶膜时,冷却管对第一、第二模板进行温控,对熔胶的温度控制更加趋于精细和线性,以调节胶膜初形成时的硬度,从而使生产出的EVA胶膜的质量更稳定,减少了次品率。并且便于下一步压花工艺的进行。
附图说明
下面结合附图对本发明的EVA胶膜挤出机作进一步说明。
图1是本发明中EVA胶膜挤出机的结构示意图。
图2是本发明中EVA胶膜挤出机的端部结构示意图。
图3是罩筒与加热-冷却单元的结构示意图。
图4是加热-冷却单元的结构示意图。
图5是本发明中挤出口器的纵向截面结构示意图。
图6是本发明中挤出口器的横向截面结构示意图。
具体实施方式
实施例
根据图1-图6所示,本发明中EVA胶膜挤出机,主要由加热管道和设在加热管道端部的挤出器6构成。
加热管道是由罩筒1和穿设在罩筒1内的螺旋输送器2构成,螺旋输送器2中心轴的轴体内充有冷却液,外部罩筒1表面间隔设有多个加热-冷却单元3,每个加热-冷却单元3内具有紧贴在罩筒1外表面的电热丝4和紧套在罩筒1外部的冷却管5,电热丝4与冷却管5依次并列设置。
挤出器6是由对合的第一模板7、第二模板8以及扣合在第一、第二模板7、8两端的第一端盖10和第二端盖11组成,第一模板7和第二模板8对合后在其接缝处形成有供EVA熔胶流出形成胶膜的间隙通道,第一模板7和第二模板8为良导热体,第一、第二模板7、8内也埋设有冷却管5,冷却管5内充有冷却液。
还包括分水器,冷却管5的循环两端连接到分水器,分水器的总进液口与总出液口之间设有循环泵和换热装置。
还包括控制器和设置在挤出机胶膜出口处的胶膜X光测厚仪,胶膜X光测厚仪的信号输出端连接到控制器,控制器的控制端连接到循环泵的受控端。
冷却管5在第一、第二模板7、8内部呈蜿蜒状敷设,循环泵为有刷直流水泵。
本发明的不局限于上述实施例,凡采用等同替换形成的技术方案,均落在本发明要求的保护范围内。
Claims (4)
1.一种EVA胶膜挤出机,主要由加热管道和设在所述加热管道端部的挤出器构成,其特征在于:所述加热管道是由罩筒和穿设在所述罩筒内的螺旋输送器构成,所述螺旋输送器的中心轴轴体内充有冷却液,所述外部罩筒表面间隔设有多个加热-冷却单元,每个所述加热-冷却单元内具有紧贴在所述罩筒外表面的电热丝和紧套在所述罩筒外部的冷却管,所述电热丝与冷却管依次并列设置,所述挤出器是由对合的第一模板、第二模板以及扣合在所述第一、第二模板两端的第一端盖和第二端盖组成,所述第一模板和第二模板对合后在其接缝处形成有供EVA熔胶流出形成胶膜的间隙通道,所述第一模板和第二模板为良导热体,所述第一、第二模板内也埋设有冷却管,所述冷却管内充有冷却液。
2.根据权利要求1所述EVA胶膜挤出机,其特征在于:还包括分水器,所述冷却管的循环两端连接到分水器,所述分水器的总进液口与总出液口之间设有循环泵和换热装置。
3.根据权利要求2所述EVA胶膜挤出机,其特征在于:还包括控制器和设置在所述挤出机胶膜出口处的胶膜X光测厚仪,所述胶膜X光测厚仪的信号输出端连接到所述控制器,所述控制器的控制端连接到所述循环泵的受控端。
4.根据权利要求2所述EVA胶膜挤出机,其特征在于:所述冷却管在所述第一、第二模板内部呈蜿蜒状敷设,所述循环泵为有刷直流水泵。
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