Description

The no oblique slot roller shell, also known as a smooth angled roller or non-grooved slanted roller, is a type of pellet mill roller with a completely smooth surface and no axial or oblique grooves. Its working face has no through slots, relying on high friction coefficient and uniform radial pressure to push material into the ring die. Compared to through oblique slot rollers, the no oblique slot roller shell completely eliminates the axial thrust and shearing action introduced by oblique slots, making it particularly suitable for materials sensitive to fiber length, prone to breakage, or requiring natural particle structure retention, such as crushed nut shells, tea dregs, certain traditional Chinese medicine residues, and high-protein feeds.

The significant advantage of the no oblique slot roller shell is its extremely uniform stress distribution, with no risk of fatigue cracking at groove bottoms or ends. Its overall service life typically reaches 1.3-1.8 times that of grooved rollers. However, its material “bite” capability is weaker, and it cannot actively perform axial distribution. Therefore, it must be used with a high-precision ring die (inner wall roughness Ra ≤ 1.6μm), forced feeding devices, and a smaller initial gap (0.1-0.2mm). Recommended materials include carburized alloy steel or powder metallurgy high-speed steel, with chrome plating or nitriding treatment optional to enhance wear resistance.

Selection warning: The no oblique slot roller shell is unsuitable for wide ring dies (>300mm) or uneven feeding conditions, as it easily leads to axial density deviation and uneven die wear. Maintenance focus includes monitoring for hardening layer peeling, elliptical wear, or polishing-induced slipping. This roller type is the preferred solution for fine chemical, pharmaceutical granulation, and certain special feed applications.

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