1. directly observe whether there is any stain or color cast (multicolor) on the ribbon with naked eyes.
2. You can check whether there is needle jumping on the belt surface. (The belt surface is uneven and damaged. )
3. Observe whether there are hairballs or fluff on both sides of the surface of the hook-and-loop tape. (uneven, uneven)
4. Observe whether the color of the belt surface is pure and whether the knitting of the belt surface is neat. (Whether the warp and weft are neat)
5. Measure the width of the belt surface with a scale, and then compare it with the corresponding size. (2 mm is normal)
2. The difference between different material components.
1. Visual inspection. (Common method)
100% polyester material: rough surface, messy hook surface, stiff and uneven belt surface.
Polyester-mixed nylon: the wool surface is thick, the hook surface is slightly neat, and the hook surface is easy to reverse.
100% nylon: thick wool, neat hook surface and soft belt surface.
2. Combustion method. (Only polyester component and nylon component can be distinguished)
Polyester or blended material: easy to burn, and black smoke appears when burning.
Nylon composition: it is not easy to burn, and there is only white smoke when burning.
3. Pull method. (the most effective method)
Polyester material: the hook is stuck and pulled vertically, and the hook is easily broken (damaged) and cannot be recovered.
Nylon material: the hook is stuck and pulled vertically, which is not easy to break (damage) and the hook is restored to its original state.