The convenient pressure of new pipes, especially plastic pipes, is related to many factors, such as pipe diameter, pipe wall thickness, service temperature, pipe fitting processing method, pipe fitting and pipe connection method, etc. Among them, the connection method is very important. If the PVDF pipe and the pipeline are not well connected, it will not only affect the service life of the pipeline system, but also cause the pipeline system to "run, leak, drip, and leak". Therefore, the connection method is an important part of installation and acceptance, and it must be paid more attention to.
The connection method of pipes and fittings. Due to the different types of pipes and fittings, the connection methods are also different. Even if the same method is used for connection, the operation during construction is also different.
1. Hot melt connection
When pipes and pipe fittings made of the same thermoplastic material are connected to each other, a special hot-melting tool is used to heat the surface of the connecting part, directly heat-melt and socket it, and connect it as a whole after cooling. Hot-melt connection is a thermal reaction process of top heating, heating, constant temperature, and cooling through the port of the pipe or fitting in a specific model under the specified temperature condition, so that the two ends of the fusion are fully, uniformly and regularly Ground and complete fusion bonding technology. The pvdf tube is not a process of chemical reaction, but a process of physical change and its result.
There are three methods for hot melt connection:
(1) Direct hot melt connection
It is to heat the connection part, and directly heat it to connect it.
(2) Socket hot melt connection
Socket type hot-melt connection is to heat and soften the pipe inserting end and socket end respectively, then insert them quickly, and achieve a relatively firm connection after cooling. In order to increase the use pressure of the socket connection, one can also use the method shown, and then add a sleeve to the socket part.
There are special tools for hot-melt connection, which are simple and low-cost, and can be used as long as there is a 220V power supply, and the connection strength is relatively high.
(3) Electrofusion connection
When the same thermoplastic pipe is connected, insert a special electrofusion pipe fitting, and the electrofusion connection machine is energized to the electrofusion pipe fitting, and the required heat is generated by the resistance wire pre-embedded inside the electrofusion pipe fitting. After cooling, the pipe is connected to the electrofusion pipe. The pipe fittings are connected as a whole.
The characteristics of PVDF tube electrofusion connection are convenient, fast connection, good joint quality and little interference from external factors. Electrofusion connection is generally used in places where hot fusion connection is not possible due to the limitation of the installation location. One of Kaixin Pipeline Technology Co., Ltd. is an imported KraussMaffei extrusion line, which meets the production needs of all caliber products while ensuring the stability of product performance.
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