What is the reason why PVC pipes delaminate after cooling and have insufficient impact resistance? How to solve?

The problems of delamination and insufficient impact resistance of PVC pipes after cooling may be due to the following reasons:
1.Raw material problems: The PVC resin or additives used are of poor quality and may contain impurities or the formula is unreasonable, causing internal stress in the pipeline during the cooling process, and then delamination. In addition, if the additives are used improperly, they will also affect the impact resistance of the pipeline.
2.Production process issues: During the production process, improper control of parameters such as temperature, pressure, speed, etc. may lead to uneven internal stress distribution during cooling of the pipeline, leading to delamination. At the same time, if the cooling rate is too fast and the temperature difference between the inside and outside of the pipe is too large, stress concentration will easily occur and impact resistance will be affected.
3.Storage and transportation issues: During storage and transportation, if pipelines are improperly stacked, squeezed, or exposed to the sun, stress may occur inside the pipelines, leading to delamination.

In order to solve this problem, you can start from the following aspects:
1.Optimize raw material selection: Select PVC resin and additives with stable quality and low impurities to ensure that the quality of raw materials meets production requirements.
2.Improve the production process: Precisely control the temperature, pressure, speed and other parameters during the production process to ensure that the temperature difference between the inside and outside of the pipeline is small and the stress is evenly distributed during the cooling process. At the same time, the cooling time can be appropriately extended to allow the pipeline to fully release internal stress during the cooling process.
3.Strengthen storage and transportation management: Stack and transport pipelines reasonably to avoid improper squeezing and exposure. During the storage process, the pipes can be turned over regularly to reduce stress accumulation in one direction for a long time.
Add post-processing process: After the pipeline production is completed, some post-processing processes, such as heat treatment or surface treatment, can be carried out to improve the impact resistance of the pipeline.
4.Strict quality control: Strengthen quality inspection and control during the production process to ensure that the quality of each batch of pipelines meets standards.

In summary, to solve the problems of delamination and insufficient impact resistance of PVC pipes after cooling, we need to start from many aspects such as raw materials, production processes, storage and transportation, and post-processing to ensure that the quality and performance of the pipes meet the requirements.