Description

Among high-end groove designs for pellet mill rollers, the No diamond slot roller shell occupies an important position in production scenarios that pursue maximum pellet density and premium-quality forming, thanks to its unique non-continuous diamond-shaped mesh structure.

A No diamond slot roller shell refers to a roller whose working surface is machined with diamond-shaped (rhombic) mesh grooves that are not axially continuous, featuring interruptions, closed ends, or staggered termination points. Material cannot be discharged directly along the axial direction within the grooves; instead, it undergoes repeated kneading, folding, and shearing before being released. This design offers the following core advantages:

First, the strongest kneading and shearing action. Because the diamond slots are non-continuous and multi-directionally intersected, material entering the grooves is repeatedly kneaded, folded, and sheared. This intense mechanical action effectively breaks down the waxy surface layer and fiber crystalline structure of the material, significantly improving its binding properties and plasticity. It is especially suitable for high-fiber, high-lignin, or smooth-surfaced materials that are difficult to form, such as rice husks, peanut shells, cotton stalks, and coffee grounds.

Second, the highest pellet density. Material undergoes multiple compressions and extended residence time within the non-continuous diamond slots, resulting in a compression ratio far higher than that of continuous groove designs. The finished pellets have extremely smooth surfaces, high density, and high hardness, resisting powdering during transportation, storage, and use, with excellent resistance to breakage. This makes them suitable for producing high-value-added products such as export-grade biomass pellets and premium aquafeed pellets.

Third, suitable for low-speed, high-compression-ratio processes. No diamond slot roller shells are typically used with low-speed pellet mills, exchanging longer material residence time in the compression zone for higher forming density. Although single-machine output is relatively lower, pellet quality is excellent.

In terms of material and process, high-quality No diamond slot roller shells are manufactured from high-alloy steel or carburized bearing steel (e.g., 20CrMnTi, GCr15) through forging, carburizing, overall quenching, and low-temperature tempering, achieving a working layer hardness of HRC58-62. Due to the complex stress distribution of this structure, premium products often incorporate cryogenic treatment or surface shot peening. The product is compatible with both ring-die and flat-die pellet mills and supports custom sizing.

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