In a true waterproof backpack, in addition to the waterproof function of the fabric, the zipper on the bag should also have a waterproof function. If the zipper is not waterproof, if the backpack is used in a water environment, the water will still penetrate through the gap of the zipper teeth. It can not achieve the true waterproof. So, today, Leimande bags will introduce waterproof zippers to you, let's learn about them together!

The waterproof zipper is a branch of the nylon zipper, which is a nylon zipper that has undergone some special treatment. Commonly used special treatment methods include: sticking PVC film, sticking TPU film, soaking in waterproof agent, coating waterproof zipper, and so on.

The main material used for the waterproof zipper with PVC film is PVC, and the main component is polyvinyl chloride. TPU film is a film made of TPU pellets through a special process. It inherits the excellent physical properties of TPU and has a wide range of applications. Because TPU overcomes many defects of PVC, TPU waterproof zipper is also superior to PVC waterproof zipper in terms of performance. Coated waterproof zipper is characterized by no falling off, no whitening, no embrittlement, low-temperature resistance of minus 70 degrees Celsius, environmental protection, softness, and good waterproofness. Among them, nylon glue-filled waterproof zipper, woven waterproof zipper, and woven airtight waterproof zipper are waterproof The performance level is above IPX6X level.

In the customization of backpacks, waterproof zippers are mostly used on fully waterproof backpacks and relatively few applications on water-repellent backpacks. If you want to customize a fully waterproof backpack, you must choose waterproof zippers, otherwise, the waterproof effect is not so ideal.

 The main factors to consider when choosing a waterproof zipper are the beauty of the product and the practical effect of waterproofing. Waterproof zippers should be considered from the following aspects:

1. The waterproof zipper film does not tear.

2. Smoothness, it is generally believed that the better the smoothness of the zipper, the better the quality of the waterproof zipper.

3. The surface of the waterproof zipper film is smooth and delicate, with a smooth feeling similar to leather, which is the appearance of high-quality waterproof zippers.

4. Waterproof effect: The size of the middle seam is directly related to the waterproof effect of the waterproof zipper. If it is too large, it will obviously not achieve the waterproof effect and lose the meaning of the waterproof zipper itself.

5. The color difference of colored waterproof zippers should be small. The difference between the color of the zipper tape and the fabric is the color difference. The color of the film surface and the color of the tape surface should be controlled by 5%.

6. Service life, the quality of the adhesive film on the waterproof zipper is directly related to the service life of the waterproof zipper.