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Process Features of Screw and Barrel for Vented Injection Machine
The function of Screw and Barrel for Vented Injection Machine Some engineering plastics, such as polycarbonate, polyamide, polymethyl methacrylate, cellulose acetate, ABS, PS, etc., are easy to absorb moisture during storage; sometimes in order to save plastic raw materials However, many fillers are added to it, and this type of filling plastic contains a large amount of calcium carbonate, wood powder, etc., which brings a large amount of gas; when some plastics are melted and plasticized in the barrel, the moisture and volatiles in them are not It is drained and brought into the injection molded product, causing the product to form defects.
Process features of Screw and Barrel for Vented Injection Machine:
1. The temperature and pressure distribution of the machine and the barrel temperature and pressure distribution of the vented injection molding machine have a great influence on the exhaust injection molding. The machine temperature and pressure of the Screw and Barrel for Vented Injection Machine are divided into screw barrels. The four temperature zones above correspond to the four main functional zones on the vent screw: feeding, plasticizing, venting and pumping.
2. If the Screw and Barrel for Vented Injection Machine is not equipped with a basin feeding device, the temperature of the feeding zone can usually be used to change the effective conveying efficiency of the material, thereby changing the fullness of the exhaust section.
3. The temperature setting of the plasticizing zone should be able to meet the requirements that the material in the homogenization section of the first-stage rod can be completely melted, and at the same time, the melt temperature should be high enough to ensure sufficient exhaust, but at the same time, it should be avoided that the temperature of the plasticizing zone is too high. Material degrades, or excessive foaming occurs.
4. The manufacturer of Screw and Barrel for Vented Injection Machine tells you that the temperature of the exhaust area should be set to maintain the required melt temperature, which is generally lower than the temperature of the plasticizing section; the final pumping temperature is the final melt temperature required for molding. The bulk temperature should be such that the melt has a lower temperature to reduce the pressure drop during injection.