Generally, if the Shore A hardness is greater than 85A, a double-cone extruder is selected. If the Shore A hardness is lower than 85A, a single screw extruder of 30-36: 1 can be used, but the screw must be lengthened. And it is a special screw and barrel for PVC.
PVC is a heat-sensitive plastic, so it is difficult without processing experience. Therefore, it is suggested that you can use single screw and granular material to extrude first, and then consider using mixed powder to extrude after you are familiar with the relevant technology.
Of course, you can also hire technicians who know technology, formula, equipment and molds, but the general salary of such technicians is basically1-20,000 yuan/month. If the technology is better, it will take hundreds of thousands of years.