钢制拖链的宽度，拉伸长度，压缩长度，两端的连接方式等，可以任意组合的产品系列，其原材料、外形、加工处理方式及尺寸大小都可以根据实际情况而定，钢制拖链的一个基本组成部分是在每个折页里都装有一个起支撑稳定作用的骨架，此骨架可以通过不同的加工方式与外部折页材料紧密相连，在一定的温度下，借助特殊助熔剂就可以使内部的PVC骨架与外部的折页牢固地粘接在一起。若护罩是在中等温度环境下使用，就可以选用此种方式，此种热粘接护罩完全不用对其进行保养，且防水、防尘、耐油、耐酸。

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