GOLDMINETM TPV5200 series elastomer ---- extrusion blow molding process points GOLDMINETM TPV5200 series of all grades of thermoplastic dynamically vulcanized rubber can employ extrusion blow molding. In most cases, you can accurately control the size of the profile, no vacuum stereotypes. Recommended aspect ratio of 24: 1 or greater ratio of the extruder. Usually single-stage screw ratio of 3: 1 or so, if you need to use the screen combination, available from 60 to 120 mesh sieve. The melt temperature is preferably kept at the lower limit of the predetermined range, the quality of the extruded product the best. ① must be dry before extrusion. Hopper is generally dried 80 ℃ / 2hrs or tray drying 100 ℃ / 1hr. For tray drying, please note that the thickness of the material layer is preferably not more than 5cm. When extrusion profiles surface is not smooth, bubble, easily broken, excessive moisture content can be determined. ② try to achieve low temperature extrusion. In the premise of ensuring the quality of plastics extrusion temperature to minimize, when the extrudate surface color uniform, from out of the extrusion die surface also slightly light, you can determine the quality of plastics is good, if the die out extrudate surface is very bright, you can determine the extrusion temperature can also be reduced. ③ parabola on temperature settings. Screw the middle of the highest temperature, the feed section and the die segment lower. Remind the die temperature setting also die and length (the distance that the tip of the screw to the die outlet), and if the distance is long, the die temperature is set lower than the middle zone temperature as long as the low 10 - 20 ℃, if the distance is short, the die temperature is set lower than the intermediate zone temperature 30--50 ℃, the typical temperature is set to 170 (simmer material), 180,190,180 (die). If you find out unstable melt extrusion temperature is not high, just press ② do. ④ before refueling be sure to clean up the die. Even if the raw material in the same grade have to clean up before reprocessing die out after refueling found extrudate surface is not smooth, extrusion unstable and prone to rupture, should die as soon as possible to clean up. ⑤ extrusion speed from slow to fast. Because the extrusion speed transfer of fast, easy to cause instability in extrusion, try to time lag, such as 3 - 5 minutes, adjusting once the extrusion rate, until transferred to a predetermined speed. When ⑥ blow molding, the temperature at the case to ensure the quality of plastics as low as possible, especially the die temperature is low. In general, the higher the hardness, the greater the blow molding products.