In the production process of UPVC profiles, problems such as bulging, yellowing, black or yellow lines on the pipe wall may also be encountered. These problems are usually related to the formulation, process or equipment. Therefore, in the production process, the quality of raw materials should be strictly controlled, the formula should be optimized, the operation process should be standardized, and the production equipment should be regularly inspected and maintained to ensure the product quality of UPVC profiles.
