ABS plate injection molding process

ABS brands injection molding process of ABS plate injection molding process: ABS plate, ABS panels products injection molding: is ABS resin processing injection molding. ABS appellative acrylonitrile butadiene styrene, is made up of acrylonitrile Butadiene - Three kinds of styrene monomer copolymerization. Due to the different proportion of three kinds of monomer, can have different performance and the melting temperature, flowing performance of ABS or additive blend with other plastics, can be expanded to more different USES and properties of ABS, such as resistance to impact, heat resistant, flame retardant, transparent, enhancement, electroplating, etc. Liquidity between PS and PC ABS, its liquidity and injection temperature and pressure, the larger the influence of injection pressure, thus forming often adopts the high injection pressure to reduce the melt viscosity, improve the filling mold performance. 1, the processing of plastic ABS bibulous rate is about 0. 2% - 0. 8%, for the average level of ABS, use oven to 80 - before processing 2-85 ℃ drying 4 hours or with a drying hopper with 1-80 ℃ baking 2 hours. For ABS, PC components in heat level appropriate drying temperature to 100 ℃, the concrete drying time available to empty out. Reworked material use no more than 30%, grade ABS plating reworked material cannot be used. 2, selection of injection molding machine can ramada standard injection molding machine ( Screw length to diameter ratio is raging, compression ratio is more than 2, the injection pressure is greater than 1500 bar) 。 If the masterbatch or appearance requirement is high, can choose a small level of the diameter of the screw. According to the 4700 - the clamping force 6200 t/m2, to determine the specific need according to plastic level and products requirements. 3, mold and mold temperature gate design can be set to 60 65℃。 6 - runner diameter 8mm。 Gate about 3 mm wide, the thickness of the like products, gate length less than 1 mm. Vent 4 - wide 6 mm thick 0. 025 - 0. 05mm。 4, melt temperature can be used to empty the injected accurate judgement. Level is different, the melt temperature is different, it is recommended that the setting is as follows: resistance to impact grade: 220 ℃ 260 ℃ to 250 ℃ for electroplating grade: 250 ℃ 275 ℃ to 270 ℃ for heat resistant level: 240 ℃ 280 ℃ to 265 ℃ 270 ℃ for flame retardant grade: 200 ℃ 240 ℃ to 220 ℃ 230 ℃ for better transparency level: 230 ℃ 260 ℃ to 245 ℃ for beautiful glass fiber reinforced level: 230 ℃ 270 ℃ for high quality requirements of products, the use of high melt temperature and mold temperature. 5, fire prevention level with a slow injection speed, heat resistant level quickly. Such as high surface requirements of products, with high speed and control the rate of fire of multi-stage injection molding. 6, back pressure, in general, the lower the back pressure, the better common back pressure is 5 bar, dyeing materials need high back pressure to make color mixture evenly. 7, residence time at 265 ℃ temperature of ABS in plastic drum residence time can't more than 5 - 6 minutes. Flame retardant time shorter, if you need downtime, should first set temperature as low as 100 ℃, clear ABS plastic tube with a general level. Clean up after the mixture into the cold water to prevent further decomposed. If you want to change from other plastic ABS material, is to use PS, PMMA, or first clear PE plastic tube. Some ABS products when the mold release new, there is no problem, after a period of time will be change color, it may be overheating or plastic in the plastic tube for a long time. 8, the post-processing general ABS products products without post-processing, only the electroplating grade products subject to bake ( 70 - 80℃，2- 4 hours) In passivation surface traces, and need to electroplating products cannot use mold release agents, products out immediately after packaging. 9, molding should pay special attention to the item when there are several levels of ABS ( Especially the flame retardant grade) The melt after the plasticizing adhesion on the surface of the screw is very big, will break down after long time. When in the above situation, need to turn the screw homogenization period of pull and compression test, and regularly use PS etc to clean up the screw.