Factory Price PVC / PPR Pipe Fitting Injection Molding Machine

Factory Price PVC / PPR Pipe Fitting Injection Molding Machine which is provide by China factory ZOWEITE is a machine for producing pipe fittings of various shapes，A pipe fitting is a part that connects a pipe into a pipe run.

Factory Price PVC / PPR Pipe Fitting Injection Molding Machine parameter

What is the injection molding process for Factory Price PVC / PPR Pipe Fitting Injection Molding Machine？

The heat source for melting PVC raw materials comes from two aspects, namely, the shear heat of plastic generated by screw motion and the resistance wire heating of the outer wall of the barrel, which is mainly the shear heat of screw motion, and the outer heating of the barrel is mainly the heat source provided when the Factory Price PVC / PPR Pipe Fitting Injection Molding Machine is started. Due to the poor heat conduction performance of PVC, although foreign plastics have been heated, the intermediate material is still in the condensed state, and even the peripheral part has been overheated and decomposed, and there may be unmelted parts inside. For all kinds of reasons, full attention must be paid to product design, mold design and injection molding process, especially the PVC special injection molding machine of excellent manufacturers, so as to produce ideal products.

Factory Price PVC / PPR Pipe Fitting Injection Molding Machine the following matters shall be noted in the injection molding process:

1. The back pressure shall be controlled at about 1MPa. Excessive back pressure will produce excessive shear force and overheat and decompose PVC. At the same time, multi-stage back pressure control shall be adopted in the glue melting process. At the beginning, the effective length of the screw is long and the back pressure should be low. With the decrease of the effective length of the screw, the back pressure should be appropriately increased to compensate for the decrease of heat. For a short period before the end of material return, the back pressure shall be reduced to prevent salivation leakage.

2. The ZOWEITE® Factory Price PVC / PPR Pipe Fitting Injection Molding Machine screw speed shall vary with different diameters. Generally, if the diameter is less than 60mm, the speed is 50-70rpm; If the diameter is > 70mm, the rotating speed is 20-50rpm to prevent PVC degradation due to excessive shear force.

3. In order to inject the plastic into the inspection cavity, the speed of each place is uniform. Generally, the injection speed should be controlled in multiple stages. The principle is to start the injection slowly. The injection rate must be increased with the gradual increase of the molding area. Until there are no cracks and shrinkage marks, the injection cannot be too fast to prevent the surface of the product from becoming denuded.

4. The temperature of the barrel during injection shall be controlled between 170-190 ℃. When the barrel temperature reaches the set temperature, the blower shall be started to cool down. When the temperature needs to rise, the blowing heating shall be stopped to prevent PVC from overheating and deterioration.

Due to the special performance of PVC, what should be paid attention to when using a special Factory Price PVC / PPR Pipe Fitting Injection Molding Machine for production?

1. The length diameter ratio of screw shall be 20:1, and the compression ratio shall be between 1:1.6-1:1.2.

2. The screw and nozzle shall be specially made of PVC and the surface shall be chrome plated.

3. Injection pressure, speed, back pressure and temperature can be controlled in multiple levels and precision. (the four cylinder direct lock two plate PVC injection molding machine produced by our company has the above performance, welcome to choose from guest rooms)

If you want to know more details about the ZOWEITE® Factory Price PVC / PPR Pipe Fitting Injection Molding Machine, please contact me.