Prediction precision plastic injection molding machinery development

Pharmaceutical packaging in China in recent years the rapid development of the plastic packaging container demand increased, the plastic packaging container molding equipment is also growing. Due to injection forming equipment in the process of running, the first injection on cosmetics packaging production, ensure the accuracy of cosmetics packaging production mouth, and then the plastic cosmetics packaging production, thus can prevent the container of gases and vapors in the cosmetics packaging production within and external gas penetration, guarantees the cosmetics packaging production between mouth and cosmetics packaging production cover has the very good performance closely. Plastic injection forming hollow container equipment in our country during the 'purpose' and '>' can a small amount of production, but the precision of the device itself and the performance are not as good as abroad equipment.
at present, the production of such equipment must work hard on improving the degree of precision, became truly precision injection machine. The so-called 'precision injection machine', not only refers to the equipment in the process of forming high speed and high pressure has good stability, and required to produce the container size of fluctuations and volatility to achieve high quality of stability, that is to say, the production of the various parts of the container size and geometry shape accuracy is higher, the container the appearance and intrinsic quality of the production efficiency and other indicators also can achieve a higher level, in this paper, the current and future a period of time in our country the development of injection machine and predict the following several aspects:
1, with high sensitivity, high reproducibility and stability of the hydraulic control system. In the hydraulic system, in order to play the function of energy conversion, transmission and control, the plunger of the precision injection machine screw is driven by hydraulic motor, controlled by hydraulic system and injection molding, the injection pressure injection rate and plasticizing, etc are installed in the hydraulic system of control valve for single control and uniform regulation of the program.
2, has can fine-tune control performance, excellent and reliable operation and convenient to use the electronic control system. Injection machine screw rotation speed adjustment, is relying on the electronic instrument, electronic instruction is composed of sensor and display, according to the different difference of one-way pulse, let the computer to determine the screw rotation speed value, accurately displayed on the display value.
3, can type billet, high speed and high pressure injection molding shrinkage can make the container when the smallest. The other characteristics of the precision injection machine is the direction of injection pressure and high pressure ultrahigh pressure, its purpose is to reduce the shrinkage rate of after forming, increase the density of the container. Owing to the high injection pressure, injection speed, compared with ordinary injection machine, the clamping system rigidity, durable performance is good, have enough injection molding mould clamping force, resistance to high pressure, high speed injection pressure, melt mold deformation.
4, with excellent plasticizing device, can make the plastic plasticizing adequately under uniform temperature, and can correct measurement. When injected into the melting within the parison molds, started to inside the mold molding, injection machine cylinder piston screw rotation, make plastic particles on the feeder loading material juice to screw the front, and under the action of heat, make the material plasticizing. When the barrel front-end accumulation of molten material and the injection quantity quite a set, the screw have thrust, the screw for the measurement of the melting a accurately and can appear on the display, to ensure the accuracy of the amount of the forecast model.
5, precision injection parison membrane, plastic mold design and manufacturing of precise billet mold, plastic mold design and manufacturing is prerequisite to obtain precise container. In the design of the parison mold, therefore, should we consider the shrinkage of the plastic raw materials, and in the design of die structure factor affected the accuracy of the container, as far as possible to reduce these factors. These factors roughly size of raw material shrinkage rate, shrinkage rate, the distribution of the flow injection parison and plastic injection port of the position and size, type of billet mold temperature control pipeline and modeling the distribution of the cold water pipe, and the choice of die material, etc.