The hottest pharmaceutical packaging plastic moldi

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Pharmaceutical packaging plastic molding machinery

pharmaceutical packaging products in China have developed rapidly in recent years. The demand for plastic packaging containers is increasing, and plastic packaging container molding equipment is also growing. During the operation of the injection blow molding equipment, the bottle mouth is first injected to ensure the accuracy of the bottle mouth, and then the bottle body is blow molded. Therefore, it can prevent the container from having a significant impact on the surface roughness of the workpiece. In addition to the tensile test, there are many kinds of experimental roughness such as contraction and twists. The internal gas volatilizes in various solutions for automobile lightweight and the external gas penetrates into the bottle, It ensures a good close performance between the bottle mouth and the bottle cap. The equipment for plastic injection blow molding hollow containers in China was basically imported from abroad during the "sixth five year plan" and "Seventh Five Year Plan". Although a small amount of production can be made during the "Eighth Five Year Plan", the accuracy and various performances of the equipment itself are inferior to those of foreign equipment

at present, efforts should be made to improve the precision in the production of such equipment to become a real precision injection blower. The so-called "precision injection and blowing machine" not only refers to the high-speed and high-pressure during the forming process of the equipment, which has good stability, but also requires the container sand produced to achieve high stability in terms of size fluctuation and quality fluctuation, that is to say, the size and geometric shape accuracy of each part of the container produced should be high. Yunnan will also vigorously develop new functional materials, and the appearance, internal quality, production efficiency and other indicators of the container can also reach a high level, Therefore, this paper makes the following predictions on the development of injection and blowing machines in China at present and in the future:

1. Hydraulic control system with high sensitivity, high reproducibility and stability

in the hydraulic system, in order to play the functions of energy conversion, transmission and control, the plunger screw of the precision injection blower is driven by the hydraulic motor, and the injection molding is controlled by the hydraulic system. The injection pressure, injection speed, plasticization pressure, etc. are controlled and evenly adjusted by the control valve installed in the hydraulic system

2. It has fine-tuning control performance, excellent and reliable operation and convenient electronic control system

the adjustment of the screw speed of the injection blower depends on electronic instruments. The electronic indication is composed of sensors and displays. According to the different differences of unidirectional pulses, the screw speed value determined by the computer is accurately displayed on the display

3. it can carry out high-speed and high-pressure injection molding, and minimize the shrinkage of the container during blow molding

Another feature of the precision injection blower is that the injection pressure is developing towards high pressure and ultra-high pressure. Its purpose is to reduce the shrinkage after blow molding and increase the density of the container. Due to the high injection pressure and fast injection speed, compared with ordinary injection and blowing machines, its mold closing system has good rigidity and durability, has sufficient mold closing force of injection and blowing, can resist the pressure of molten plastic injected at high pressure and high speed, and the mold deformation is minimal

4. With excellent plasticizing device, the plastic can be fully plasticized at uniform temperature and can be measured 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 cylinder of the injection blower rotates, so that the feeder transports the plastic particles loaded with juice to the front end of the screw, and plasticizes the material under the action of heat. When the molten material accumulated at the front end of the barrel is equivalent to the set injection amount, a certain thrust is generated on the screw, so that the screw can accurately measure the molten parts and appear on the display, ensuring the accuracy of the pre molding amount

5. Design and manufacturing technology of precision injection parison film and blow mold

the design and manufacture of precision blank mold and blow mold is the prerequisite for obtaining precision containers. Therefore, the shrinkage of plastic raw materials and the factors affecting the accuracy of containers in the design of mold structure should be considered in the design of parison blow molding mold, so as to reduce these factors as much as possible. These factors roughly include: the shrinkage rate of raw materials, the distribution of shrinkage rate, the location and size of injection molding blanks and injection flow ports, the distribution of blank mold temperature control pipes and blow mold cold water pipes, as well as the selection of mold materials

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