闭口拉链：(closed-end Zipper)：从拉头的顶端到下止的末端.开口拉链：(Open-end Zipper)从拉头的顶端到下止的末端.逆开拉链：(Movable open end Zipper)从拉头的顶端到下止的末端.双拉头两头相对：zipper with double sliders(arranged inhead-to-head relation)两下止末端之间的长度.双拉头两头相背:zipper with double sliders(arranged in bottom-to-bottom relation两两拉头顶端之间的长度.
