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PE pipe is a kind of pipe that is used in the construction industry and home decoration. PE pipe is actually a pipe made of polyvinyl chloride, and the methods and processes used in the processing process will affect to a large extent. Depending on its quality, as well as the selection of raw materials, temperature, screw speed, traction speed, etc., the quality of PE pipes will also be affected during processing. Among these factors, temperature is the main factor affecting the production of PE pipes.
PE pipe is made of special polyethylene as raw material and extruded by plastic extruder at one time. It is used in township water supply pipe network, irrigation water diversion project and agricultural sprinkler irrigation project. It is especially suitable for plastic pipes with acid and alkali resistance and corrosion resistance.
Because the PE pipes are connected by hot melt and electric heat fusion, the integration of the interface and the pipe is completed, and it can effectively resist the hoop stress and axial impact stress generated by the pressure, and the PE pipe does not add heavy metal salt stabilizers, and the raw materials have It is poisonous, does not scale, does not multiply bacteria, and avoids secondary pollution of drinking water. Therefore, if the temperature is too low, the plasticization is not good, and if the temperature is too high, the material is easy to differentiate.
The temperature control should be determined according to the original formula, extruder and head layout, screw speed and other factors. Moreover, after the production is completed, the accumulation of PE pipes should not be too kneaded or exposed to the sun, otherwise the amount of raw materials of PE plastic pipes will change due to oxidation induction.
In addition, the low temperature impact resistance of PE pipe is very good. The low-temperature embrittlement temperature of polyethylene is extremely low, and it can be used safely in the temperature range of -60-60 °C. During construction in winter, due to the good impact resistance of the material, pipe embrittlement will not occur, but do not think that the PE pipe can withstand high temperature. It is very wrong to use it as a hot water pipe at 60°C.
Any material will undergo physical changes under long-term overload work, and the pressure-bearing capacity of PE water supply pipes under high temperature conditions has a great change compared to the pressure-bearing capacity at 20 °C, that is to say, the pressure-bearing capacity of PE pipes decreased sharply with increasing temperature.
Therefore, backfilling must be carried out in accordance with the requirements of the national construction specifications during construction to avoid the influence of the environment (especially high temperature weather) on the temperature in the pipe, to ensure the smooth progress of the project acceptance, and to strictly follow the temperature reduction calculation during the pressure acceptance. pressure test. Therefore, in terms of safety, it is better to reserve 20% of the space in various applications.
