{"id":13987,"date":"2025-07-02T07:28:54","date_gmt":"2025-07-02T05:28:54","guid":{"rendered":"https:\/\/www.energycle.com\/?p=13987"},"modified":"2026-01-06T09:43:12","modified_gmt":"2026-01-06T08:43:12","slug":"%ec%8a%a4%ed%8a%b8%eb%9e%9c%eb%93%9c-%ed%8e%a0%eb%a6%bf%ed%99%94-vs-%ec%88%98%ec%a4%91-%ed%8e%a0%eb%a6%bf%ed%99%94-rpe%eb%a5%bc-%ec%9c%84%ed%95%9c-%ec%99%84%eb%b2%bd%ed%95%9c-%ec%84%a0%ed%83%9d","status":"publish","type":"post","link":"https:\/\/www.energycle.com\/ko\/%ec%8a%a4%ed%8a%b8%eb%9e%9c%eb%93%9c-%ed%8e%a0%eb%a6%bf%ed%99%94-vs-%ec%88%98%ec%a4%91-%ed%8e%a0%eb%a6%bf%ed%99%94-rpe%eb%a5%bc-%ec%9c%84%ed%95%9c-%ec%99%84%eb%b2%bd%ed%95%9c-%ec%84%a0%ed%83%9d\/","title":{"rendered":"\uc2a4\ud2b8\ub79c\ub4dc \ud3a0\ub9bf\ud654 vs. \uc218\uc911 \ud3a0\ub9bf\ud654: rPET\ub97c \uc704\ud55c \uc644\ubcbd\ud55c \uc120\ud0dd \uac00\uc774\ub4dc"},"content":{"rendered":"\n

For any successful recycling operation, the journey from waste to valuable raw material requires precision at every stage. After transforming post-consumer bottles into clean flakes within a high-performance PET bottle recycling system<\/a><\/strong>, a critical decision arises: how to process these flakes into their most marketable form. Pelletizing is the answer, but choosing the right technology is paramount.<\/p>\n\n\n\n

The two dominant methods in the industry are traditional strand pelletizing and the more advanced underwater pelletizing (UWP). Each offers distinct advantages and presents different operational and financial considerations. This guide provides a head-to-head comparison to help you determine the optimal solution for your rPET operation.<\/p>\n\n\n\n

The Workhorse: Understanding Strand Pelletizing<\/strong><\/h4>\n\n\n\n

The strand pelletizing process is a robust and widely adopted method. The workflow is linear and visually intuitive:<\/p>\n\n\n\n

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  1. Extrusion:<\/strong>\u00a0Molten rPET is extruded through a die head, forming continuous, spaghetti-like strands.<\/li>\n\n\n\n
  2. Cooling:<\/strong>\u00a0These strands travel through a water bath or trough to cool and solidify.<\/li>\n\n\n\n
  3. Dewatering:<\/strong>\u00a0An air knife or suction unit blows off excess water from the surface of the strands.<\/li>\n\n\n\n
  4. Cutting:<\/strong>\u00a0The cooled, dry strands are fed into a pelletizer, where a high-speed rotor with cutting blades chops them into cylindrical pellets.<\/li>\n<\/ol>\n\n\n\n

    The Precision Method: Understanding Underwater Pelletizing (UWP)<\/strong><\/h4>\n\n\n\n

    Underwater pelletizing is a more integrated and automated process, valued for its precision and consistency.<\/p>\n\n\n\n

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    1. Extrusion & Cutting:<\/strong>\u00a0Molten rPET is extruded through a die plate that is in direct contact with a circulating water system. Rotating blades slice the polymer into pellets at the moment it emerges from the die face, underwater.<\/li>\n\n\n\n
    2. Cooling & Transport:<\/strong>\u00a0The newly formed, spherical pellets are immediately solidified by the water and transported as a slurry away from the die head.<\/li>\n\n\n\n
    3. Dewatering:<\/strong>\u00a0The slurry is fed into a centrifugal dryer<\/a>, which spins at high speed to separate the water from the pellets, resulting in a dry, finished product.<\/li>\n<\/ol>\n\n\n\n

      Head-to-Head Comparison: Strand vs. Underwater<\/strong><\/h3>\n\n\n\n

      Choosing a pelletizing system for rPET requires a careful analysis of several key factors.<\/p>\n\n\n\n

      1. Pellet Quality & Consistency<\/strong><\/h5>\n\n\n\n