What Is an Airtight Zipper with TPU Sealing System?

An airtight zipper is a sealing system designed to prevent both air and water leakage, even under pressure or full immersion.

Unlike standard waterproof zippers that resist rain or splashes, airtight zippers are engineered for critical applications where even micro-leakage can cause product failure.

Airtight performance depends on structure, materials, and precision manufacturing, not surface coatings.

TPU Sealing Structure Explained

Core Components: TPU Film, High-Density Tape, Sealed Slider

True airtight performance is achieved through a laminated sealing system, not the zipper teeth alone.

Typical Structure Includes:

• TPU sealing film (primary barrier)

• High-density woven zipper tape

• Precision-formed zipper elements

• Sealed slider interface

When closed, the TPU films meet and form a continuous sealing channel, preventing air and water penetration.

Materials: Why TPU Film Matters

TPU (Thermoplastic Polyurethane) is the preferred material for airtight zippers due to:

• Excellent elasticity and recovery

• High resistance to air and water penetration

• Stable performance across temperature ranges

• Compatibility with HF welding and heat sealing

Film thickness and hardness are selected based on pressure requirements and application environment.

How Airtight Zippers Are Manufactured

Airtight Zipper Manufacturing Process

Airtight zippers require tighter process control than conventional or waterproof zippers.

Our typical production workflow:

1. High-Density Tape Preparation
   Engineered for dimensional stability and lamination strength.

2. TPU Film Selection & Conditioning
   Based on pressure, temperature, and welding method.

3. Precision Film Lamination
   Controlled heat and pressure ensure structural bonding, not cosmetic adhesion.

4. Zipper Element Integration
   Designed to maintain sealing continuity and smooth operation.

5. Airtight Slider Sealing Design
   Minimizes leakage at the most critical point.

6. Edge Sealing & Post-Treatment
   Enhances durability, UV resistance, and long-term stability.

7. Performance Testing
   Air pressure, immersion, and durability tests before mass production.

Typical Applications of Airtight Zippers

YGZIP airtight zippers are widely used in:

• Outdoor dry bags and waterproof storage

• Inflatable equipment and rescue gear

• Medical protective covers

• Industrial protective enclosures

• Marine and water-sports equipment

Each application requires a customized balance of flexibility, pressure resistance, and durability.

Why Choose YGZIP Airtight Zipper Solutions

• Focused on functional zipper systems, not generic accessories

• Engineering Support and Customization
• Reliability and Repeatable Performance

• Application-driven material and structure design

• Engineering support from concept to mass production

• Stable quality and repeatable performance

We help customers choose the right airtight level, not the most expensive solution.