TPU 气密拉链的核心是“一体成型”：用 TPU 颗粒注塑或挤出形成齿链，与 TPU 胶带热压复合为一个整体，再通过高频焊接与面料无缝压胶结合，最终达到 IPX8 气密。相比传统缝制 + 胶条工艺，一体成型消除了针眼与接缝，是密封可靠性的根本来源。
The core of a TPU airtight zipper is one-piece molding: TPU pellets are injection-molded or extruded into teeth, thermally bonded with TPU tape into one unit, then joined to fabric via high-frequency welding and seamless lamination to reach IPX8 airtightness. Compared with traditional sewn + tape construction, one-piece molding eliminates needle holes and seams — the root of sealing reliability.
TPU 材料特性
TPU material properties
- 弹性与回弹、耐磨、抗撕裂；
- Elasticity, abrasion and tear resistance.
- 耐水解：长期接触水与湿气不降解；
- Hydrolysis resistance: no degradation from long-term moisture exposure.
- 耐温：-30°C 至 70°C 稳定工作；
- Temperature: stable from -30°C to 70°C.
- 环保、可回收。
- Eco-friendly and recyclable.
主要工艺步骤
Main process steps
- ① 混料配色：按需调配 TPU 原料与颜色；
- ① Compounding & coloring: blend TPU resin and color as required.
- ② 注塑 / 挤出成型齿链：形成连续齿形结构；
- ② Injection molding / extrusion of teeth into a continuous chain.
- ③ 与 TPU 胶带热压复合：齿链与胶带成为一个整体；
- ③ Thermal lamination with TPU tape: teeth and tape become one unit.
- ④ 高频焊接成形：加工拉头、止扣与端部结构；
- ④ High-frequency welding: sliders, stops, and end structures.
- ⑤ 与面料无缝压胶：热封胶带贴合缝线，杜绝针孔渗漏；
- ⑤ Seamless lamination to fabric: tape covers seams, eliminating needle-hole leaks.
- ⑥ 全检：气密、开合、拉伸、老化逐项测试。
- ⑥ Full inspection: airtightness, cycling, tensile, and aging tests.
高频焊接与无缝压胶
High-frequency welding & seamless lamination
高频焊接利用高频电场使 TPU 分子自身发热熔合，无需胶水，接缝强度高、无痕迹；无缝压胶用热封胶带覆盖缝线区域，杜绝针眼渗水。两者结合是气密拉链可靠性的工艺保障。
High-frequency welding uses a high-frequency field to fuse TPU molecules themselves without glue, giving strong, invisible seams. Seamless lamination covers stitch lines with heat-seal tape to block needle-hole leakage. Together they guarantee airtight zipper reliability.
与 PVC / PEVA / 尼龙工艺的区别
Differences from PVC / PEVA / nylon
- PVC：成本低，但弹性与环保性较弱；
- PVC: low cost but weaker elasticity and eco-profile.
- PEVA：轻量，但强度与耐温有限，适合日常防水；
- PEVA: lightweight but limited strength/temperature — for everyday waterproofing.
- 尼龙：柔韧，但需覆膜处理，气密性弱于 TPU 一体成型。
- Nylon: flexible but needs film lamination; less airtight than one-piece TPU.
质量控制
Quality control
- 每批测试：气密压力、开合寿命、拉伸强度、耐温老化；
- Per-batch tests: sealing pressure, cycle life, tensile strength, thermal aging.
- 可提供检测报告，支持客户抽检。
- Test reports available; customer spot checks welcome.