Temperature control
　　⒈ Cylinder temperature: injection molding process requires control barrel temperature, mold temperature and nozzle temperature. First two temperature mainly affects the flow of plasticized plastic and, while the latter mainly to influence the flow and the temperature of the cooling plastic. Each has a different plastic flow temperature, with a plastic, due to different sources or grades, the flow temperature and the decomposition temperature there is a difference, this is due to the different average molecular weight and molecular weight distribution caused by different types of plastic injection plasticizing process is different in the machine, so the cylinder temperature selected is not the same.
　　⒉ nozzle temperature: nozzle temperature is generally slightly lower than the maximum temperature of a cylinder, which is to prevent frit "drooling phenomenon" may occur through nozzles. Nozzle temperature nor too low, it may cause the early condensate frit and the clogging of the nozzle, due to the early or slug into the mold cavity affect the performance of the article.
　　⒊ Mold temperature: Effect of temperature on the intrinsic properties of the article mold and the apparent quality greatly. Low mold temperature is determined by the presence or absence of crystallinity of the plastic, the size and structure of the product, performance requirements, and other processing conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).
　　Pressure control
　　the injection pressure during the injection pressure and pressure comprises two kinds of a plasticizer, and directly affect product quality and plasticized plastic.
　　When :( ⒈ plasticization pressure back pressure) using a screw type injection machine, the screw tip melt pressure when the screw is rotated by the back pressure is referred to plasticization, also known as the backpressure. The size of such pressure can be adjusted by a hydraulic system relief valve. During injection, the size of the plasticization pressure with the design of the screw, and the product quality requirements of the type of plastic needs to change varies, and if these conditions are the same screw speed, pressure will increase plasticizing strong shearing effect that will increase the temperature of the melt, but will reduce the efficiency of plasticization, increased backflow and the leakage flow, increasing the driving power.
　　In addition, increasing plasticization pressure often make a uniform temperature of the melt, and uniformly mixing the colorant in the melt discharge gas. In general operation, the decision should be plasticized pressure as low as possible to ensure good quality products under the premise that the specific value is used with different varieties of plastic, but generally less than 20 kg / cm.
　　⒉ injection pressure: In the current production, almost all of the injection pressure to the plunger injection machine are plastic screw top or
　　by the pressure (the pressure oil line conversion) of the subject. Injection pressure in injection molding role is to overcome the flow resistance of the cartridge from the plastic flow cavity, the melt filling rate of administration and the compaction of the frit.
　　Molding cycle
　　to complete an injection molding process, said time required for the molding cycle, also known as molding cycle. It actually includes the following sections:
　　molding cycle: a direct impact on productivity of the molding cycle and equipment utilization. Thus, in the production process, the quality should be guaranteed under the premise of each relevant time to shorten the molding cycle. Throughout the molding cycle time and cooling time of injection is most important, the quality of the products which have a decisive influence. Injection time of the filling time is directly inversely proportional to the rate of filling, the filling time production is generally about 3-5 seconds. Dwell time is the time the injection pressure of the plastic cavity of time, the proportion of the entire large injection time is generally about 20-120 seconds (Laid thickness up to 5 parts to 10 minutes). Before the gate to melt frozen, how much pressure retention time, the dimensional accuracy of the products affected, if in the future, was not affected. Dwell time has the most favorable value, it is known to depend on melt temperature, mold temperature and the size of the sprue and gate. If the size of the main channel and the gate and the process conditions are normal, i.e. usually the smallest to derive volumetric shrinkage fluctuation range of pressure values prevail. Cooling time depends mainly on the thickness of the article, plastic crystalline properties and thermal properties of the mold temperature and the like. The end of the cooling time, ensure that when the article should not cause changes in release principle, cooled temporal typically between about 30 to 120 seconds, the cooling time is too long is not necessary, not only the production efficiency, complicated parts will cause difficulties stripping, stripping even when forced ejection will produce stress. Other molding cycle time is the production process is continuous and automated, and the degree of automation and related continuous.