The PA66 plastic sleeve placed in the sleeper of the railway speed-increasing section has high compressive strength and good insulation performance. The occipital cannula is used in the railway track system to alleviate the impact of the train speed on the track. It is one of the key components of the railway bolster. The performance of the material is demanding, and the cause of the defect is studied. The study found that there is a corresponding range of injection pressure and speed. If the pressure is too high or the speed is too fast, the mold will open and overflow. The holding pressure should not be too low, and the product with too low pressure will have a large shrinkage, and the proper pressure and injection time can reduce the shrinkage rate of the product, thereby improving the quality of the product.
Pre-buried plastic casing for concrete squat
