Method for sorting mixed crushed materials of PE, PP and PET
2025-08-06 09:28:02
For a mixture of PP, PE, and PET crushed materials, you can start by placing them in a water pool. Since PET has the highest density (1.30–1.38), it will sink to the bottom first. Next, add alcohol to the water to adjust the overall density. The goal is to bring the density down to around 0.91. At this point, PP, which has a density of 0.89–0.91, will also sink, while PE, with a slightly higher density (0.91–0.965), may float or remain suspended depending on the exact mixture. This method allows for effective separation of the three plastics based on their different densities. By carefully adjusting the liquid’s density, you can isolate each material step by step, making the recycling process more efficient and practical. This technique is commonly used in waste sorting facilities where quick and cost-effective separation is needed. It's important to monitor the density levels throughout the process to ensure accurate results. Using this approach not only helps in identifying each plastic type but also improves the quality of the recycled materials for further processing.
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