Recently, a groundbreaking technology in plastic extrusion and expansion molding has been successfully developed by the Institute of Plastics Machinery and Plastic Engineering at Beijing University of Chemical Technology. According to Professor He Yadong, this innovative method is primarily used for manufacturing plastic pipes, fittings, and other complex-shaped plastic components. The key advantage lies in its energy efficiency—instead of the traditional melting and re-injection process, it employs a "secondary molding" technique, which significantly reduces energy consumption. This new approach is considered highly promising for the future of plastic processing. The institute has conducted extensive research and successfully produced various product shapes using this technology. It has already secured a national invention patent and holds independent intellectual property rights. However, despite these achievements, the technology is still in the theoretical phase and has not yet entered mass production. Professor He mentioned that he is currently in discussions with several manufacturers, aiming to bridge the gap between research and industrial application. In today’s plastics industry, conventional molding methods can produce almost all types of plastic products. However, for items with unique or complex geometries, such as multi-way fittings, special-shaped components, or small-batch production parts, traditional methods may not be the most cost-effective. Injection molding, for example, faces challenges when dealing with thin-walled, large-diameter, or irregularly shaped parts, which are difficult to produce using standard techniques. Compared to existing methods, the extrusion and expansion molding technology offers several distinct advantages: 1. The equipment structure is simpler, resulting in lower initial investment. 2. The material does not undergo a phase change during processing, allowing for lower temperatures and reduced energy use. 3. It is ideal for producing parts with significant variations in cross-sectional dimensions. 4. The control system is straightforward, offering greater flexibility in process management. 5. It leverages the high productivity and low cost of extruded parisons. 6. For smaller production runs, it can significantly cut down on costs. This technology represents a major step forward in the field of plastic manufacturing, with great potential for both efficiency and sustainability.

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