拉链识别

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Dual zippers

Dual zippers (also referred to as two-way zippers) have two sliders:
One that unzips from the top
One that's oriented upside down and unzips from the bottom
Importantly, these zippers don't have a zipper box (reference image #3).
If an issue occurs with a dual zipper, first check that both sliders are present at the bottom of the zipper. The top slider can migrate up the zipper tape and the zipper won't fasten with only the bottom slider.

双头拉链

双头拉链（亦称双向拉链）配备两个拉链头：
一个从顶部向下拉开
一个倒置安装并从底部向上拉开
需特别注意：此类拉链不设传统插座（参见图示#3）。
当双头拉链出现故障时，请先确认两个拉链头均位于拉链底部。若仅剩底部拉链头，因顶部拉链头可能沿拉链带上移，将导致无法正常闭合。

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