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In recent years, China has witnessed rapid growth in pharmaceutical packaging products, with a rising demand for plastic packaging containers driving the expansion of related molding equipment. Among these, injection blow molding machines have become increasingly important due to their ability to produce high-precision containers. The process typically begins with the injection of the bottle neck, ensuring its accuracy, followed by the blowing of the body, which prevents gas from escaping and external air from entering. This ensures a tight seal between the bottle and cap.
During the "6th Five-Year Plan" and "July 5th" periods, China started producing plastic injection blow-molded hollow containers on a small scale, but the precision and performance of the equipment were not as advanced as foreign counterparts. Today, there is a strong need for improvement in the accuracy of such machines to meet modern production standards.
A "precision injection blower" is more than just fast and high-pressure operation; it must also ensure stability in container size and quality. This means higher dimensional accuracy, better geometric shape, and improved appearance and intrinsic quality. The following aspects are key to the future development of injection blowers in China:
1. A hydraulic control system with high sensitivity, reproducibility, and stability. The plunger screw in the precision injection blower is driven by a hydraulic motor, and the system controls injection pressure, speed, and plasticization pressure through control valves. This ensures smooth and accurate operation during the molding process.
2. An electronic control system with fine-tuning capabilities, reliable performance, and user-friendly interface. The speed of the blower screw is adjusted using an electronic instrument that includes a sensor and display. Based on unidirectional pulse signals, the computer calculates and accurately displays the screw rotation speed.
3. High-speed, high-pressure injection capabilities that minimize container shrinkage. These machines apply high injection pressure and speed, reducing shrinkage after blow molding and increasing container density. The mold clamping system is designed to withstand high-pressure, high-speed injection, ensuring minimal deformation and long-lasting performance.
4. An excellent plasticizing unit that ensures uniform temperature and accurate measurement. As the plunger screw rotates, it conveys and heats the plastic particles, allowing them to be fully melted and measured before being injected into the parison mold. This guarantees precise pre-plasticizing and consistent output.
5. Precise molds and blow molds are essential for producing high-quality containers. In the design phase, factors such as material shrinkage, injection port size, mold temperature control, and cooling water distribution must be carefully considered. Choosing the right mold materials also plays a crucial role in achieving the desired accuracy.
Overall, the future of injection blow molding technology in China lies in improving precision, stability, and efficiency, ensuring that the final products meet the highest quality standards.
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