How do you choose the extruder?

1. According to the molding products specifications to choose: products specifications different, with the feed rate is different also, can refer to “size and the diameter of the screw”, first select the diameter of the screw, and then by the screw diameter further select the specifications.Two, according to the raw materials used in the extrusion molding products: PVC extrusion molding with a device (1) a single screw extruder. More than 20 years ago, PVC extrusion molding with gradient type single screw extruder, because PVC is a kind of heat-sensitive plastic, extruder screw rotation speed can not be too high, should first put the PVC powder (film) material after granulation, then in the production of the products and then had a special PVC powder extrusion machine, don’t need granulation, can be directly put after powder mix well in extruder production molding products. Note: need to adhere to plasticizer for PVC of material soft PVC products, extrusion granulation, must also be before then extrusion molding.(2) tapered differential twin screw extruder. Such kind of extruder, appropriate price for extrusion of PVC powder do not cause excessive friction heat, avoid the decomposition of raw materials, extrusion rate, high finished product yield and stable performance and guaranteed, currently use PVC mixed powder production of rigid PVC products, first consider using the extruder.(3) is a reminder to the twin screw extruder. Use the extruder can be directly put the PVC powder extrusion molding pipe, special-shaped material directly, also suitable for HDPE material extrusion tube, yield is higher than the above two kinds of extruders, but because prices are too high and maintenance is more complex, at present there is few application.2, and other plastic extrusion molding equipment For PE, PP, PS, PC, ABS plastic extrusion molding, now choose single screw extruder, this basically is the price of the extruder is cheap, operation and maintenance more convenient, and now has a more efficient single screw extruder, and spake, ratio of length to diameter screw rotation speed can reach 100-300 r/min.