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Conical hole roller shell – tapered hole design with larger entrance and smaller bottom. Wedging-progressive compression effect improves pellet density and surface smoothness. The conical slope naturally guides material, reducing hole-edge accumulation and clogging risks. Adjustable taper angle of 2°-8° to match fine powders, sticky materials, and premium feed pelleting requirements.
The conical hole roller shell is an advanced hole design for pellet mill rollers, featuring holes that are conical (larger at the entrance, smaller at the bottom) rather than straight cylindrical. This tapered structure creates a natural guide slope at the hole entrance and a converging space at the hole bottom, generating a unique “wedging-compression” dual effect. As material enters the conical hole, it experiences progressively increasing compression due to the tapering space, helping to improve pellet density and surface smoothness. Additionally, the conical slope significantly reduces stress concentration at the hole edge, extending roller service life.
The core advantages of the conical hole roller shell lie in its self-guiding and progressive compression characteristics. Compared to straight holes, conical holes guide material more smoothly into the holes, reducing the risk of material accumulation and clogging at hole openings. The recommended taper angle is 2°-8° – too small approaches straight hole performance, too large causes material sticking. This design is particularly suitable for fine powders, sticky materials, and high-density pellet applications such as chemical catalysts, pharmaceutical excipients, and premium feeds.
