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Straight hole roller shell – regular square/triangular hole array arrangement. Compression-relief cycles expel entrapped air and free moisture. Land areas create continuous linear compression, improving pellet density and surface smoothness. Specifically engineered for fermented feeds, distiller's grains, biomass raw materials, and chemical powders. R-radius at hole bottoms eliminates stress concentration for uniform wear and longer service life.
The straight hole roller shell is a discrete surface design for pellet mill rollers, featuring circular straight holes (blind holes or through holes) arranged in a regular array (typically square or equilateral triangle pattern) on its working face. Unlike diamond hole arrangements, the hole positions in a straight hole roller shell are aligned in both directions, forming a regular “land-hole” grid structure. This design produces a uniformly distributed “compression-relief” action during material compression, with the hole areas providing momentary pressure relief passages that effectively expel entrapped air and free moisture from the material, while avoiding the excessive fiber shearing caused by continuous groove patterns. It is particularly suitable for materials with moderate moisture content and high air content, such as fermented feeds, distiller’s grains, certain biomass raw materials, and chemical powders.
The core advantage of the straight hole roller shell lies in its regular hole array, which results in more uniform roller surface wear and eliminates stress concentration zones. Compared to diamond hole arrangements, straight hole arrays offer simpler processing, more precise hole spacing control, and higher surface opening consistency. Additionally, the land areas between straight holes form continuous straight lines, creating linear compression zones as the roller rotates, which helps improve pellet density and surface smoothness. This design is particularly suitable for medium-speed operation and materials with good flowability.
Selection guidelines: Hole diameter (φ4-10mm), hole depth (2-5mm), and hole spacing (wall thickness 2-5mm) should match material characteristics. The ratio of hole diameter to depth should be controlled between 1:0.5 and 1:1. High-chromium cast iron or powder metallurgy high-speed steel is recommended, with an R-radius (≥0.5mm) required at hole bottoms to eliminate stress concentration. Maintenance focus includes monitoring wear uniformity on lands between holes and checking for edge curling at hole openings.
