There are many polymer molding machines, such as extruders, injection molding machines, refiners and so on. What is the use of each of these machines.

Opening machine refiner is mainly used for rubber molding

Injection machine (injection molding machine) is mainly used for plastic products mold type molding

Extruder due to the classification of more, so the application of occasions is more

Can be divided into several categories:

***Mixing pelletizing, reactive extrusion (the same double)

Extruding molding (iso-double)

Shaped extrusion molding (cone double)

The website that introduces these is there, but they will not be very comprehensive. If you want to know, or if you are studying this specialty, you can slowly build up your understanding, or you can consult more relevant literature. There is no quick and easy way.

Good luck