发布时间:2025-01-18 06:56:56
大多数都是锌合金做的。拉链分为尼龙拉链、金属拉链、树脂拉链。尼龙拉链是单丝用尼龙单丝通过加热压模缠绕中心线组成的,金属拉链牙齿是用铜线或铝线通过排牙机器排出来的,树脂拉链牙齿是用聚脂塑料米通过染料配色并通过注塑机器排出来的。希望对你有用
求高密度聚乙烯hdpe双壁波纹管 de和dn 的对照表 比如de250 de315 对应的公称直径各是多大的
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