Plastic hose is an important part of modern industry. Mainly used as wire, cable, automatic instrument signal wire, cable protection tube and civil shower hose, specifications from 3mm to 150mm. Small caliber hose (inner diameter 3mm-25mm) is mainly used for precise optical ruler sensing line protection and industrial sensor line protection.
The plastic hose has been widely used in water supply pipeline system and gas pipeline system, but in recent years in the field of gas transportation pipeline system PVC market share close to zero, the amount of water supply system has slightly decline. However, PVC hose obtained steady growth in non pressure piping systems such as drainage, sewage and waste discharge system in consumption, mainly because of the raw materials for PVC production depends on crude oil than other thermoplastics, so the production cost is relatively low.
Plastic corrugated hoses can be designed with solid walls or structural walls, and their connections are mainly solvent bonded. According to whether the use of plasticizers, can be divided into hard PVC corrosion resistance and high temperature performance is relatively high, while the cost is relatively high.
Although the PE pipeline system does not have a cost advantage (relatively high raw material prices), it has been rapidly promoted and popularized. This is mainly due to the rapid, convenient and safe connection of the PE hose, that is, hot melt connection. Teflon hose hose due to PE (polyethylene plastic hose, hose) characteristics of the melting temperature range and melt viscosity determines the welding of PE tube has excellent, so as to make the PE hot melt connection joint strength reached or even exceeded the flexible body strength. In addition, the use of PE electrofusion connecting pipe fittings can also make the repair work of the PE pipeline system easy and convenient, thereby improving the safety and reliability of the pipeline.
PP hose (plastic hose, polypropylene hose) has been used in the production of pipes since 1970s. According to the difference of polymer structure, PP material can be divided into three categories: PP-H (homopolymerization polypropylene), silica gel hose PP-B (block copolymer polypropylene) and PP-R (random copolymerization polypropylene).
The PP-R piping system is an important part of the building's cold and hot water piping system. China has experienced the promotion of PP-R plastic pipe system boom, but unfortunately, due to the interference of fake and shoddy products and unqualified products, PP-R pipe market and sustainable development has not been very good, but left to the market "plastic pipe is not durable" bad impression, so that a lot of water supply pipeline system construction designers and developers and have lost the confidence of the plastic pipe. From a technical point of view, there are many reasons for the failure of substandard products. On the one hand, there is no use of qualified raw materials, in the early development of plastic pipe, practitioners understanding for the raw materials of the long-term performance and strength is not enough for the evaluation of raw materials, method of understanding is not deep enough; on the other hand is the connection of the system is a problem, because the PP-R pipe modulus in the plastic hose is relatively large, so the joints prone to excess stress, especially in the joint of steel plastic transition cycles of hot and cold water after a period of time, the leakage will occur frequently.