1. We peel off the PVC plastic mask of the protective film tape and the release test with silicone coating, and knead the side coated with glue on the back of the mask to make the glue and glue adhere tightly, and then pull it away. Pay attention The length of the glue filament stretched between the glue and the glue cannot exceed 0.2 mm (with the naked eye, there is almost no glue thread). In this way, the possibility of degumming of the protective film tape during use is extremely small.
2. It is also very important to check the thickness of the PVC mask, because it is related to the impact of the protective film tape. Generally, the thickness of the protective film tape is about 9 threads. If deep measurement is required, the thickness of the mask should be increased accordingly, otherwise it will be broken down and damage the processed object. It is not easy to accurately grasp it by visual inspection and hand touch alone, because the diameter of a hair is about 7 filaments, it is difficult to imagine the sensitivity of the hand. Some people use a scale to weigh the weight of each roll. In fact, the thickness of the bottom paper and glue of the protective film tape is different, so it is difficult to accurately grasp.
Detect the thickness of the 9-thread mask because it is coated with a layer of glue on the back, so it should reach 11 threads instead of the total 9 threads of the mask plus glue.
3. For the detection of masks with different thicknesses, please refer to the above steps, and so on. Finally, check the toughness of the mask. You can first pull and tear from the length direction of the mask, and then pull and tear it horizontally from the width direction of the mask, because some masks have different toughness in the straight and horizontal directions. Good toughness has better elasticity and elongation, and strong impact resistance; poor toughness, brittleness and easy tearing, poor impact resistance. Of course, the mask is too soft, it will not work for a long stretch, it is easy to shrink, the carved pattern is easy to be deformed, the deep carved pattern is easy to be distorted, it will lose a certain aesthetic ratio, and the impact resistance is also poor. I hope to pay attention to the brand and the products of the regular factory when choosing the protective film tape, and not to pursue cheapness blindly.
4. Finally, it is recommended that users buy the best and use it, do not store too much, because the change of seasons, temperature and humidity changes can affect the quality of the protective film tape. Protective film tape is generally not suitable for exposure to the sun, nor is it suitable for being affected by moisture, so it should be placed in a ventilated place.