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New Favorite in Plastic Recycling Industry: How Color Sorters Distinguish PE and PP Particles
2025-09-02The plastic recycling industry is witnessing a game - changer as color sorters become its new favorite, especially in solving the critical challenge of distinguishing PE (Polyethylene) and PP (Polypropylene) particles. These two common plastic materials, though similar in appearance, have distinct properties and recycling values, making accurate separation essential—and color sorting machines are rising to the task.
Traditional separation methods for PE and PP particles, such as manual sorting or chemical testing, are time - consuming, labor - intensive, and prone to errors. In contrast, modern optical sorters equipped with advanced spectral imaging technology have revolutionized the process. These plastic particle color sorters use high - resolution cameras and near - infrared (NIR) sensors to analyze the subtle differences in light reflection and absorption between PE and PP particles. PE particles typically have a higher light transmittance in specific wavelength bands, while PP particles show unique spectral peaks—differences that the automatic color sorters can detect in milliseconds.
What makes these industrial color sorters even more valuable is their speed and accuracy. A single high - performance color sorter can process up to 5 tons of plastic particles per hour, with a separation accuracy of over 99%. This not only significantly reduces labor costs for recycling plants but also ensures that the sorted PE and PP particles meet high - quality standards for reprocessing into new products, such as plastic containers, pipes, and packaging materials.
Moreover, customized color sorting machines for plastic recycling can adapt to different particle sizes and moisture levels, a key advantage in the messy reality of plastic waste. They can also filter out impurities like metal fragments or other plastic types while separating PE and PP, further enhancing the purity of the final recycled materials. As the global focus on environmental protection and circular economy grows, the demand for such efficient color sorting equipment in the plastic recycling industry is soaring.
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