Cross-linked polyethylene (PEX) pipes used in hot water supply are required for high mechanical strength and high creep resistance at high temperature. PEXa pipes which are made by peroxide cross-linking have better performance, such as creep resistance and thermal shock resistance than the pipes made by other cross-kinking method.
Finished PEXa pipe can be coated with EVOH oxygen barrier and other protection layer, by another separate extrusion line, to get a 3 layer PEXa EVOH oxygen barrier pipe or 5 layer PEXa EVOH oxygen barrier pipes.
The three layer PEXa oxygen barrier pipe strucrues are： PEXa pipe, adhesive layer, and outer EVOH oxygen barrier layer. However the five PEXa oxygen barrier pipe structures are: inner PEXa pipe, adhesive layer, Middle EVOH oxygen barrier pipe, Adhesive layer, and outer PE protection layer.

The ultrasonic overlap welding PERT-AL-PERT pipe production line is used to produce 5-layer overlap welding PERT-AL-PERT pipes. The multi-layer co-extrusion technology of KAIDE company makes the distribution of each layer of the aluminum-plastic pipe uniform and the finished pipe has good roundness. The equipment can be designed to produce different color pipes according to customers' different pipe application. The size of the pipe that can be produced: 16-63mm. Multi-layer composite co-extrusion technology is the key point that we have been the leading member in this industry since the 19th century.

This oxygen barrier pipe production machine is used to produce 3 layer type PEXa/EVOH oxygen barrier pipes. The line speed is up to 20m/min.
Unlike like oxygen barrier pipes,which are made by co-extrusion technology. The PEXa oxygen barrier pipes are produced with two separate steps. Firstly the inner PEXa pipes is made by Ram extruder, the oldest extrusion technology, known as ENGEL extrusion technology. Then coated with outer oxygen barrier layer, which is done by coextrusion techlogy.

This oxygen barrier pipe production line is used to produce 3 layer type PEX/EVOH oxygen barrier pipes. The line speed is up to 30m/min with top technology.
PEX stands for cross-linked polyethylene. Technically refere to as a silane process, but is more often called steam or moisture cross-linking. The cross-link is done after the HDPE is extruded into tube. The put finished product in hot steam container, and keep warm for certain time.
The PEX pipes with oxygen barrier is are co-extruded with 3 extruder, for that three different layer materials, inner PEX, middle adhesive, and outer oxygen barrier.
External coating of oxygen barrier PEX pipe effectively prevents diffustion of oxygen molecules into the water through walls of the pipe. This feature prevents corrosion of cast iron components in the water system, and allows using it in hot water hydronic heating applications, including baseboard, radiator he ating, fan coils, radiant floor heating and snow melting applications.

This oxygen barrier pipe production line are used to produce 3 or 5 layer type Polybutylene PB/EVOH oxygen barrier pipes.
Polybutylene pipe, also known as PB or Poly-B pipe, features a great flexibility and is a common type of plastic piping which is suitable for hot and cold water and central heating installations as a flexible alternative to copper in both hard and soft water areas. Polybutylene pipe is lightweight and flexible, and its soft material is especially handy for long runs, as it's very easy to bend.
Oxygen Barrier is a layer of special polymer, abbreviated EVOH, which is typically applied to the external surface or in the middle of the PB pipe. The EVOH oxygen barrier layer protects the PB tubing from the diffusion of oxygen molecules into the water of the radiant heating or hydronic heating system and significantly reduces the corrosion of common cast iron components such as circulator pumps.

The PPR-AL-PPR multi-layer composite pipe production line is used to produce 5-layer PPR aluminum-plastic pipes with a diameter of 16-63mm. The produced PPR aluminum pipes are widely applied in potable water pipeline systems which are hygienic and non-toxic. The PPR-AL-PPR pipe combines the rigidity of metal with the flexibility and pressure resistance of plastic. Pipes can afford either high pressure or high temperature -40℃-95℃. The outer PPR layer of the PPR-AL-PPR pipe production line is thicker than the inner PPRlayer, so the output of the outer layer extruder of PPR is larger than the inner layer.