PE water supply pipe is a common kind of building water supply system. With the vigorous development of PE pipe in the Chinese market, the product has not only been limited to building water supply, but has gradually been developed and applied to many industries, such as urban underground pipe network laying, ground source heat pump, landfill, farmland irrigation, etc. Therefore, the quality of pipes is the focus of attention of manufacturers and users. How to grasp the quality of pipes? After years of experience, a set of stable production technology of PE water supply pipes has been developed.
First of all, let's talk about the processing of PE pipes. Many factors in the process are crucial to the quality of pipes. For example, the selection of raw materials, temperature, screw speed, compressed air, traction speed, traction cooling, etc. will affect the PE pipe.
1. The selection of raw materials is the most basic and also a factor: there are many specifications and brands of PE raw materials, and the same brand of raw materials can be used to produce PE bellows Ultra wear-resistant composite pipe However, PE water supply pipes cannot be produced. Here, it is still necessary for the manufacturer to carry out more tests and select materials suitable for their own production of pipes.
2. Influence of temperature on PE pipe quality: temperature is the main factor affecting plasticization and production of plastic pipes. If the temperature is too low, the plasticization is not good, and if the temperature is too high, the materials are easy to decompose. The temperature control shall be determined according to the original formula, extruder and die structure, screw speed and other factors. When processing rigid pvc pipes, because the processing temperature is quite close to the decomposition temperature, the material temperature at each point should be strictly controlled in production. At the same time, pay attention to the error of the temperature measuring instrument and the position of the measuring point.
3. Influence of screw speed on pipe quality: the selection of screw speed of super wear-resistant composite pipe directly affects the output and quality. The screw speed depends on the size of the extruder, while the super wear-resistant composite pipe depends on the upper pipe diameter. With the increase of rotating speed, the amount of extrusion increases, and the shearing force applied to the material is large, which is conducive to the plasticization of the material. However, the residence time of the material in the screw is short, and the excessive friction heat makes the inner wall of the pipe rough and the strength of the pipe decreased. Therefore, the control of the screw speed should be comprehensively balanced according to the requirements of output, product appearance, and physical and mechanical properties.
4. Influence of traction speed on PE pipe quality: the traction speed directly affects the product wall thickness. The traction speed shall match with the extrusion speed. Generally, the traction speed is 1%~10% higher than the pipe extrusion speed.
5. Impact of compressed air on pipe quality: compressed air shapes the pipe and maintains a certain roundness. Its pressure is generally 0.02~0.05mpa
6. The influence of traction cooling on the quality of pipes: It is believed that we all know that if the cooling is not reached, the extrudate will stick and cannot be shaped. It is recommended to use air cooling combined with water cooling, and the cooling water temperature should be kept at about 15 °.
