What is HDPE Pipe Extrusion Line?

HDPE pipe extrusion line also named HDPE pipe manufacturing machine which is using extrusion process to make HDPE water pipe and PE sewage pipe.For krah pipe Extrusion Line and water pipes Extrusion Line also applies

Outline :

• What equipment does the production line of hdpe pipe extrusion line have?

• What should be paid attention to in the forming of HDPE pipe extrusion line?

What equipment does the production line of hdpe pipe extrusion line have?

1. HDPE pipe extrusion line extruder. For extrusion molding on HDPE pipe extrusion line, a single screw extruder with a screw diameter of 45 mm or 65 mm is generally used. The length-to-diameter ratio of the screw is L/D ≥ 20, the compression ratio is 3.5 to 4, and the thread is an isometric mutant or an isometric gradient.

2. Molding die for HDPE pipe extrusion line. The die structure for extrusion molding on HDPE pipe extrusion line is mostly right-angled, 1-perforated plate; 2-machine simple mold transition cone; 3-die body; 4-connecting flange; 5-split cone; Spinning hole; 7-tightening screw; 8--temperature measuring hole, taper hole at the melt inlet D: d≈2~4, splitting cone angle is about 500, and three layers of 40/80/40 mesh filter are added in front of the orifice plate. . The plate formed by the HDPE pipe extrusion line is a spinneret. The plate is made of alloy steel with high temperature resistance, small deformation and high wear resistance. Heat treatment is also required after finishing to improve the hardness and wear resistance of the pore working face.

3. The cooling sink of the HDPE pipe extrusion line. The cooling water tank of the HDPE pipe extrusion line acts to cool the melt from the mold of the HDPE pipe extrusion line and extrude the already formed wire. The cooling water tank is formed by welding a steel plate and has a guide wire running guide roller. The length of the tank is 1~2m and the height is about 1m. The cooling water temperature in the water tank is adjustable within the range of 20~40°C. The cooling liquid level is adjustable within the range of 20~50mm.

4. The traction stretching device of the HDPE pipe extrusion line. It consists of a traction stretching roller set, a wire heating device and a screw. The function is to reheat the cooled blank and then stretch it to rearrange the molecular chains into an ordered structure consistent with the length direction to improve the working strength of the finished yarn.

5. The screw bar of the HDPE pipe extrusion line. The screw is a set of smooth and smooth steel rollers coated with chrome layer, which are installed at the inlet and outlet ends of the stretch heating water tank. The pressure screw that enters the water tank end pressurizes the drawn blank, which is beneficial to the drawing and arranging of the blank; the pressure screw at the end of the water tank is actually a rotating guide roller, and the front and rear pressure screws of the water tank also ensure the entry into the water tank. The depth of the wire immersed in the water is fixed, so that the tensile quality of the wire is relatively stable.

6. Heat treatment unit for HDPE pipe extrusion line. The heat treatment after stretching the yarn is to eliminate the internal stress generated when the yarn is forcibly stretched, so as to prevent the finished yarn from damaging the winding device due to excessive shrinkage during winding. Further, the monofilament which is not subjected to the heat treatment shrinks when it is applied at a high temperature, and therefore, the filament after the stretching is usually subjected to heat treatment. There are two heating methods for the heat treatment wire of the HDPE pipe extrusion line, which can be heated by hot air circulation or by boiling water. Generally, the temperature is controlled to be lower than the temperature at which the wire is stretched, and the wire is also operated at a slower speed than the stretched fast roll. Because the wire shrinks somewhat during heat treatment.

7. Winding device for HDPE pipe extrusion line. The winding of the finished yarn is generally wound into a roll. The coiled filaments are taken up by monofilaments, and some are rolled together. In order to obtain a tension-balanced wire roll, the winding device is required to be driven by a torque motor.

What should be paid attention to in the forming of HDPE pipe extrusion line?

1. When designing the length of the forming section of the HDPE pipe extrusion production line, take about 30 times the wall thickness of the HDPE pipe extrusion production line, and the inner diameter of the die should be slightly smaller than the inner diameter of the sizing sleeve (the reduction value is less than 10%). 5|xm. The roughness of the working surface of the forming section of the forming die should be no more than 0. 32|xm.

2. The inner diameter of the sizing sleeve of the cooled HDPE pipe extrusion line is slightly larger than the outer diameter of the finished pipe (about 3%). The length of the cooling sizing sleeve can generally be determined by about 4 times the diameter of the pipe.

3. The cooling and cooling rate of the die exit of the HDPE pipe extrusion line can be handled as appropriate. Slowly cooling the tube blank can avoid stress concentration of the tube or dull surface of the tube; rapid cooling, low crystallinity and fine grain size can help to improve the strength of the product.

4. When the tube blank of the HDPE pipe extrusion production line is shaped by the inner diameter compressed air, pay attention to the compressed air pressure within the range of 0.02 ~ 0.04MPa; if the vacuum sleeve is used, the vacuum inside the sizing sleeve should be controlled at -0.08 ~ -0.06MPa range. The inner diameter surface of the sizing sleeve is plated with a hard chrome layer, the surface is smooth, the pore diameter is the same, and the arrangement is uniform and reasonable.

 HDPE pipe extrusion line also named HDPE pipe manufacturing machine which is using extrusion process to make HDPE water pipe and PE sewage pipe.If you want to know how  to make, please send email to us, our sales team will send your HDPE pipe manufacturing process video for our clients in our factory.