Production Process of Spiral Water-tight Zipper

1.  Raw Material Preparation：
   • Made from high-strength nylon or polyester spiral coil structure, offering flexibility, durability, and abrasion resistance — commonly used in outdoor gear and rugged equipment
   • Prepare TPU (thermoplastic polyurethane) or rubber-based waterproof coatings for water-tight sealing.
   • Auxiliary materials: Metal/plastic sliders, top/bottom stops, and polyester tape substrate.

2. Nylon Braiding Process：
   • Braid nylon yarn into continuous zipper teeth strips using high-speed braiding machines, controlling tooth spacing and density.
   • Stabilize the shape through high-temperature heat pressing to prevent deformation.

3. Coating and Sealing Treatment：
   • Apply TPU or rubber coating evenly on the braided nylon tape to fill gaps between teeth.
   • Cure the coating via UV or hot-air drying to form a seamless airtight layer.
   • For premium products, add sealing strips at the tooth base for enhanced airtightness.

4. Tape and Slider Assembly：
   • Stitch the coated nylon braided teeth to polyester substrate tape for strength and flexibility.
   • Assemble sliders with precision machinery to ensure smooth operation.
   • Attach waterproof metal/plastic top/bottom stops to secure the slider.

5.  Water-tightness Testing & Quality Control：
   • Water-tight Test: Mount the zipper on a test mold, inject compressed air (e.g., 0.5-1.0 bar), and measure leakage rate (≤0.1%).
   • Tensile Test: Verify teeth strength (≥80N/tooth) under simulated usage conditions.
   • Durability Test: Perform 5,000+ open/close cycles to ensure coating integrity and slider smoothness.

6. Packaging & Environmental Compliance：
   • Use moisture-proof vacuum packaging to protect coatings from humidity.

Technical Advantages：

• • Lightweight Design: 30%-50% lighter than metal zippers.
  • Full Sealing: IPX6-rated water-tightness (dust/waterproof).
  • Customization: Color, length, and tensile strength tailored to client needs.

Applications：

• • Bags: Waterproof bags, hiking packs, cycling packs—requiring protection from splashes and rain ingress.

  • Garments: Shell jackets, ski wear, down jackets, sun-protective wear, fishing pants—to keep the wearer dry and comfortable.

  • Footwear Decoration: As design elements in waterproof, work, and athletic shoes—combining aesthetics with functional sealing.

  • Tent Systems: Outdoor tents and rapid-assembly large tents—used in waterproof zipper assemblies.

  • Gloves: Ski gloves and waterproof gloves—providing sealed interfaces to block water ingress.

    ✅ Watertight Zipper Dynamic Test Description

    Test Name:

    Watertight Zipper Dynamic Test

    Objective:

    To verify the waterproof performance of the zipper under repeated bending, motion, and mechanical stress — simulating real-world conditions where gear is constantly moving and exposed to water.

    Test Procedure Overview:

    • The zipper is mounted on a flexible base that performs cyclic bending movements;

    • During movement, water is sprayed or pressure is applied directly to the zipper;

    • Any sign of leakage is observed under dynamic conditions;

    • The test evaluates sealing performance, mechanical durability, and material bonding under stress.

    Key Performance Indicators:

    • 💧 Dynamic Waterproof Sealing: Maintains watertightness even when bent, stretched, or in motion;

    • 🔁 Durability in Repeated Use: Waterproof performance remains stable through frequent bending and operation cycles;

    • ⚙️ Structural Adhesion Strength: Zipper-to-fabric bonding remains intact even under mechanical motion and pressure.

    Recommended Applications:

    Ideal for dry bags, wetsuits, outdoor jackets, waterproof backpacks, and military-grade waterproof gear.