Development Direction of China's Precision Injection Blowing Machinery

The rapid development of pharmaceutical packaging products in China in recent years, the increasing demand for plastic packaging containers, plastic packaging container molding equipment is also growing. As the injection blow molding equipment is in operation, first the bottle mouth is injected to ensure the accuracy of the bottle mouth, and then the bottle body is blown, thereby preventing the gas in the container from volatilizing and the penetration of external gas into the bottle, ensuring the bottle The mouth and cap have a very close performance. China's equipment for plastic injection blow-molded hollow containers can be produced in small quantities during the "6th Five-Year Plan" and "July 5th" period, but the precision and performance of the equipment itself are not as good as foreign equipment.

At present, the production of this kind of equipment must work hard to improve the precision and become a truly accurate injection blower. The so-called "precision injection blower" not only means that the high-speed and high-pressure in the molding process of the equipment has a good stability, but also requires a high stability in terms of container size fluctuations and quality fluctuations, that is to say the dimensions of the containers produced And the geometric shape accuracy is higher, and other indicators such as the appearance of the container and the intrinsic quality of production efficiency can reach a higher level. This article makes predictions for the development of injection blowers in China at present and for a period of time in the following aspects:

1. Hydraulic control system with high sensitivity, high reproducibility and stability. In the hydraulic system, in order to function as energy conversion, transmission and control, the plunger screw of the precision injection blower is driven by a hydraulic motor and is controlled by a hydraulic system. Injection pressure injection speed and plasticization pressure The single program is controlled and evenly adjusted by the control valve installed in the hydraulic system.

2, with fine-tuning control performance, good and reliable operation and easy-to-use electronic control system. Note that the adjustment of the speed of the blower screw depends on the electronic instrument. The electronic indicator consists of a sensor and a display. According to the difference in the unidirectional pulse, the computer determines the value of the screw rotation speed and accurately displays the value on the display.

3, can be high-speed high-pressure injection parisons, blow molding can make the container shrink the minimum. Another characteristic of the precision injection blower is the direction of injection pressure high pressure and high pressure, its purpose is to reduce the shrinkage rate after blow molding, increase the density of the container. Due to the high injection pressure and fast injection speed, compared with ordinary injection blower, the mold clamping system has good rigidity, good durability, sufficient injection mold clamping force, and can resist the pressure of high pressure, high-speed injection of molten plastic. The mold deformation is minimal.

4. It has excellent plasticizing device, which can fully plasticize the plastic under uniform temperature and can measure correctly. When the molten material is injected into the parison mold and begins to be molded into the blow mold, the plunger screw of the inner barrel of the injection blower rotates, so that the material feeder conveys the plastic particles loaded into the juice to the front end of the screw and heats the same. Under the effect of plasticizing the material. When the molten material accumulated on the front of the barrel is equal to the set injection volume, a certain thrust is generated on the screw, so that the screw accurately measures the melted part and can appear on the display, thereby ensuring the accuracy of the pre-plasticizing amount.

5. Precise injection moulding film, design and manufacture of blow moulds The design and manufacture of precision moulds and blow moulds are prerequisites for obtaining precision containers. Therefore, in the design of the mold blow mold, the shrinkage rate of the plastic raw material should be considered, and the factors affecting the accuracy of the mold in the design of the mold structure should be reduced as much as possible. These factors are roughly the size of the raw material shrinkage, the distribution of shrinkage, the size of the injection molding parison and injection port, the mold temperature control pipe and blow mold cooling water distribution, as well as the choice of mold materials.

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