Nylon Cloth Tape

Features

Nylon Cloth Tape has advantages such as being clean, crisp, and having fine texture, making it an ideal material for rubber vulcanization processes. Take the application of wrapper cloth in the vulcanization of automotive V-belt covers as an example. When the cover is molded, the wrapper cloth is first soaked in 50°C water and then wrapped around the outer surface of the cover before entering the vulcanization tank for vulcanization.

Comparison of Heat Shrinkage Properties between Nylon Cloth and Cotton Canvas Wrapper Cloth

Relationship between Shrinkage Rate and Temperature: The heat shrinkage rate of cotton canvas changes very little with increasing temperature, while the heat shrinkage rate of nylon wrapper cloth increases with rising temperatures. After heat treatment at 50°C, the shrinkage rate of nylon cloth is about 0.6%, but after heat treatment at 150°C, the shrinkage rate reaches 5-6%. In contrast, the shrinkage rate of cotton canvas wrapper cloth is almost unaffected by temperature, with a shrinkage rate of only 0.8% after heat treatment at 150°C.

The shrinkage characteristics of nylon wrapper cloth are determined by the molecular structure of nylon fibers. Polycaprolactam, which belongs to aliphatic polyamides, contains a considerable amount of easily rotatable methylene groups (-CH2), making the macromolecular chains more flexible, which leads to greater deformation of this polymer.

Relationship between Shrinkage Rate and Storage Time: The shrinkage rate of cotton canvas decreases with prolonged storage time and eventually stabilizes at a constant value.

Application Benefits of Nylon Wrapper Cloth in Vulcanization

The covers vulcanized with nylon wrapper cloth are smooth inside without cracks, bubbles, or uneven joints, solving the long-standing issue of excessive joint thickness causing serious visible scars on the product surface and affecting its appearance quality, which often leads to product rejection.

In terms of durability, nylon wrapper cloth lasts longer than cotton canvas wrapper cloth. The average service life of a cover vulcanized with cotton canvas wrapper cloth is about 215 uses, while the average service life of a cover vulcanized with nylon wrapper cloth exceeds 330 uses, representing an improvement of 115 uses compared to cotton canvas.

From an economic perspective, nylon wrapper cloth also has a lower production cost than cotton canvas wrapper cloth. Nylon wrapper cloth can be reused more than 8 times, while cotton canvas wrapper cloth can only be used 3 times. This reduces the quantity required by 1/5. In terms of the process, using low-temperature vulcanization can save energy.

Nylon wrapper cloth is preferred for rubber products due to its high strength, good heat resistance (with a melting point of around 250°C), and minimal deformation at high temperatures.

Usage Guidelines for Nylon Wrapper Cloth

Before use, the wrapper cloth should be soaked in water. Ensure the cloth is wet before wrapping it around the product. During high-temperature vulcanization, the water in the nylon wrapper cloth evaporates due to heat, causing the nylon to shrink, which ensures the appearance quality and density of the product.

Each time the wrapper cloth is used, it is best to soak it in 50°C-70°C hot water for more than 4 hours to ensure its softness. Otherwise, after a few uses, the wrapper cloth will harden, affecting the quality of the wrapping and shortening its lifespan. If possible, adding some fabric softener, such as organosilicon compounds, will enhance the results.

The nylon wrapper cloth has one tight edge and one loose edge. For a more aesthetically pleasing product appearance, it is best to wrap the loose edge on the inside (to make the overlapping marks shallower), while the tight edge ensures adequate tension from the outer surface to the inner layer. The wrapping tension should be just right—tight enough so that the tight edge feels unbreakable by hand, but not too tight. If the tension is too loose, the wrapper cloth may wrinkle, affecting the appearance quality.

Specifications-Normal

Specifications - ultrathin

Specifications - Ultrathick