Is PVC coated webbing peeling normal?

Peeling of PVC coated webbing is a common issue, often considered normal due to the inherent properties of PVC and its interaction with the nylon webbing typically used as the inner layer.

PVC is a versatile plastic known for its durability, flexibility, and resistance to environmental factors like moisture and chemicals. However, it lacks natural adhesion properties when it comes to bonding with fabrics such as nylon. The chemical structure of PVC does not naturally adhere well to nylon, leading to potential peeling or delamination over time, especially under stress or environmental exposure.

Nylon is a strong, elastic, and abrasion-resistant material often used for its high tensile strength and durability. It’s commonly used as the core material in coated webbing due to its strength and durability Its smooth surface, however, makes it challenging to bond securely with coatings like PVC without special treatments.

That’s the reason why PVC coated webbing is easy to peel-off. However, the environment will also affect the peeling strength. Both high and low temperatures can exacerbate peeling. Heat can soften PVC, reducing its adhesion, while cold can make it brittle, leading to cracking and peeling. And prolonged exposure to moisture or certain chemicals can degrade the adhesive properties of the PVC, leading to separation from the nylon webbing.

Besides, mechanical stress also does matter. Regular use, especially in demanding conditions, can cause friction and mechanical stress, which over time can lead to peeling. Repeatedly applying and releasing tension on the webbing can weaken the bond between the PVC and nylon.

While peeling in PVC coated webbing is common, several treatments and techniques can enhance the bond between PVC and nylon, reducing the likelihood of delamination.

1. Surface treatment of nylon webbing

This involves treating the nylon webbing with plasma to increase its surface energy, making it more receptive to bonding with PVC. Or applying a chemical etching process to roughen the nylon surface, increasing its adhesive properties.

2. Adhesive layers

Using special adhesive layers designed to bond PVC to nylon can significantly enhance the overall adhesion. Or use heat activated adhesives. These adhesives are activated during the coating process, creating a stronger bond between the PVC and nylon.

3. Coating techniques

Applying multiple layers of PVC with intermediate adhesive layers can enhance bonding strength. Or use heat sealing. Ensuring that the PVC is properly heat-sealed to the nylon webbing during the manufacturing process can prevent peeling. This requires precise control over temperature and pressure during application.

4. Quality control

Implementing rigorous testing protocols to check for adhesion strength during production can help identify potential issues before the product reaches the market. We can also use environmental simulation. Testing the coated webbing in simulated real-world conditions (e.g., exposure to heat, cold, moisture) can help ensure the durability of the bond.

PVC coated webbing peeling is a common issue due to the inherent properties of PVC and nylon. But there are also some solutions to solve the problem. However, adding adjuvant in coated webbing will must affect its property and performance. If you have enough budget, maybe TPU coated webbing or silicone coated webbing is the better choice.