This article analyzes the issue of pellet return and secondary cutting in underwater pelletizers, which affects pellet quality by increasing irregular shapes and fines. It identifies five key factors contributing to the problem: (1) excessive backflow of overflow and spray water, (2) inadequate spray flow beneath the water knife holder, (3) improper water temperature and flow rate, (4) incorrect blade back rake angle, and (5) excessive spacing between front and rear traction rollers. Solutions include optimizing backflow control, ensuring proper spray direction and pressure, adjusting water temperature seasonally, maintaining blade geometry, and setting appropriate roller gaps to improve cutting efficiency and product quality.

This article outlines three key strategies to prevent oil bleeding in TPE (Thermoplastic Elastomer) products during high summer temperatures: selecting high-viscosity, high-flash-point white oil and optimizing the oil-filling process; adding surface-treated nano-silica to enhance molecular adsorption; and choosing high-molecular-weight SEBS or SEBS-SEPS blends to improve oil-locking performance. These methods help maintain product appearance, improve user experience, and ensure stable material performance under heat.

This article provides a comprehensive guide to the rotating blades used in pelletizers, covering their material types, tooth profile classifications, lifespan analysis, and proper maintenance methods. It explains the differences between blades used for underwater strand pelletizing and dry cutting, details key parameters of blade teeth, identifies common sharpening mistakes, and offers best practices for extending blade life and maintaining cutting efficiency. Proper full-profile grinding and maintaining original blade angles are emphasized to ensure optimal pellet production and blade durability.

This article provides a comprehensive overview of the temperature-related properties of TPE materials, including their brittleness temperature, heat distortion temperature, melting temperature, drying temperature, processing temperature, mold temperature, decomposition temperature, container tolerance temperature, and service temperature. It aims to give industry professionals a thorough understanding of elastomer performance under various temperature conditions. Additionally, the article introduces four common types of TPE materials—styrenic elastomer SBS, thermoplastic polyurethane (TPU), thermoplastic polyolefin (TPO), and thermoplastic polyester elastomer (TPEE)—along with their basic properties and applications.