PVC HOSE are twin-screw and single-screw which are good

As we all know, in the extrusion machinery, single-screw machine and twin-screw machine:
One is a screw, a screw is two are driven by a motor. Power varies with the screw. 50 cone double the power of about 20KW, 65 is about 37KW. The output and the material and the screw-related, 50 Cone double output of about 100-150KG / H, 65 cone double about 00-280KG / H. Single screw production is only half. Extruders according to their number of screws can be divided into single-screw, twin-screw and multi-screw extruder. The current single-screw extruder is the most widely used, suitable for general processing of materials. Due to the double-screw extruder with less heat generated by the friction, the material subjected to the shear more evenly, screw the delivery capacity of larger, more stable extrusion, the material stays in the barrel long, mixed. According to GB factory r5761-2006 suspension of a common PVC resin national standards, PVC resin indicators are: Bo number (K ​​value or average relative molecular weight), the number of impurity particles, volatiles, apparent density, sieve residue , “Fisheye” number, plasticizer absorption, whiteness, water extract conductivity, residual vinyl chloride monomer content of 10 items. In addition, the relative molecular mass distribution, thermal stability time,