945-701 PC基础创新塑料--945聚碳酸酯（PC）树脂是一种非填充、注塑级树脂。这种非氯化、非溴化阻燃PC具有UL-94V0等级，有多种不透明颜色可供选择。945是一种通用树脂，旨在满足各种应用的需求。
注射 额定值 单位制
干燥温度 120 °C
干燥时间 2.0 到 4.0 hr
建议的大水分含量 0.020 %
料斗温度 60.0 到 80.0 °C
料筒后部温度 260 到 280 °C
料筒中部温度 270 到 290 °C
料筒前部温度 280 到 310 °C
射嘴温度 270 到 290 °C
加工（熔体）温度 280 到 310 °C
模具温度 80.0 到 110 °C
The molding process of PC resin is controlled in moldingprocessing. Moisture control and the selection of moldingprocessing conditions are the two most important factors affectingmolding , which are described as follows:
A. Moisture control PC plastics will also break bonds, reducemolecular weight and physical strength due to hydrolysis even whenthey encounter very low moisture. Therefore, before molding, themoisture of PC resin should be strictly controlled below 0.02% toavoid the reduction of mechanical strength of molded products orabnormal appearance such as bubbles and crazes on the surface. Inorder to avoid abnormal conditions caused by moisture,polycarbonate shall be dried by hot air for more than 3 ~ 5h at thetemperature of 120 ℃ or treated with dehumidification dryer beforeprocessing.
B. In order to meet the needs of various molding processes, PCresin has different specifications of melt flow rate. Generally,the melt flow rate between 5 ~ 25g / 10min is suitable forinjection molding. However, the optimal processing conditions arequite different due to different types of injection moldingmachines, shapes of molded products and PC resin specifications,which should be adjusted according to the actual situation.
C. Key points for selection of injection molding machine moldlocking pressure: take the projected area of the finished productper cm2 * 0.47 ~ 0.48t (or per square inch * 3 ~ 5T) machine size:the weight of the finished product is about 40 ~ 60% of thecapacity of the injection molding machine. If the capacity (oz) ofthe machine is expressed in PS, it needs to be reduced by 10%before using the capacity of PC (1 oz = 28.3 g). Screw: the lengthof the screw shall be at least 15 diameters, and its L / D is 20:1.The compression ratio should be 1.5:1 to 30:1. The check valve atthe front end of the screw shall be of sliding ring type, and theresin flow gap shall be at least 3.2mm. Nozzle: the tip openingshall have a minimum diameter of 4.5mm. If the weight of thefinished product is more than 5.5kg, the nozzle diameter should bemore than 9.5mm. In addition, the tip opening should be 0.5 ~ 1mmless than the gate diameter, and the shorter the section, thebetter, about 5mm.
