Installation method of airtight zipper

December 31, 2019

There are four different installation methods for airtight zippers.

1. Sewing is the most common zipper installation method. However, there are other things you should consider when sewing airtight / watertight zippers.
To maintain air tightness, the stitching must be covered with a compatible coating. This is usually achieved by covering the sewing seam with sealing tape to prevent liquid or air leakage. Therefore, this process is often referred to as "seam seal".

2. Adhesive installation of metal air / watertight zippers is particularly common. Here, the zipper is adhered to the tape material with a compatible adhesive. Therefore, the main consideration here is to choose the right adhesive based on the substrate and tape.
For example, neoprene tape can generally use neoprene-based adhesives, especially when neoprene is used, and the fabric is also neoprene-based. The adhesive used for PVC tape or polyurethane tape will vary. Your choice of fabric will also determine the choice of compatible adhesives. Therefore, it is recommended to test the compatibility of adhesives with zippers, fabric materials and tape materials.
3. Radio frequency (RF) welding. Using RF welding, similar polymer materials can be welded together by radio waves. As mentioned earlier, this method can only be used with PVC and polyurethane zippers.
The main consideration for this method is how to set up your RF machine. You will need different settings when working with different types of materials or thicknesses. The zipper is welded to the inside of the fabric material, and the seams are sealed to the surrounding edges.
4. Hot air welding. We have already discussed a process similar to RF welding. But instead of using radio frequency, we use hot compressed air to weld the materials together. In some cases, this method is commonly used for PVC zippers.
For hot air welding, the main consideration is heat retention. Heat above 70 degrees Celsius can damage the zipper. Moreover, a seam sealing process is often required to prevent air / water leakage.

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