Ring Die Pelleting Machine

Application Landscape and Audience Distribution

Ring-die pellet mills serve a wide range of applications and user groups:
Feed processing enterprises: Producing various pelleted feeds for livestock, poultry, and aquaculture using raw materials such as corn, soybean meal, crop stalks, grass, and rice husks.
Livestock and poultry farms (including specialized breeders): Establishing in-house feed production lines to manufacture pellets for pigs, cattle, sheep, rabbits, chickens, ducks, and fish.
Organic fertilizer manufacturers: Producing bio-organic fertilizer pellets from materials such as livestock manure and crop stalks.
Biomass energy companies: Producing biomass fuel pellets from materials like wood chips and crop stalks.
Chemical, pharmaceutical, and food industries: Granulation processing of various powdered materials.

Scope of Materials and Production Capacity Overview

Ring-die pellet mills accommodate a wide range of raw materials. Feed materials include corn, soybean meal, crop stalks, grass, and rice husks. Biomass materials include sawdust, rice husks, cotton stalks, cottonseed hulls, and weeds. Fertilizer materials include bio-bacterial fertilizers, organic fertilizers, and compound fertilizers. Production capacity ranges from 0.5–1.5 tons per hour for the SZLH25 model to 4–10 tons per hour for the SZLH400 model. Pellet diameters range from 1.5 mm to 12 mm.

Operational Mechanism and Granulation Principle

The operating mechanism of a ring-die pellet mill is based on extrusion molding between the die and the rollers. The ring die is driven by a power source to rotate actively, while the pressure rollers rotate passively, driven by the friction of the material situated between them and the die. Under intense compression between the ring die and the rollers, the material is gradually compacted and forced into the die holes, where it takes shape. In the process of feed pelletizing, the material first undergoes steam conditioning to gelatinize starch and denature proteins; the conditioned material then enters the compression chamber, where it is formed into cylindrical pellets under the pressure of the ring die and rollers, before being cut into uniform pellets by a cutter.

Coordination between the Quenching and Tempering Process and the Production Line

The conditioning process at the front end of the ring die pellet mill is crucial to the pelletizing outcome. Conditioning involves introducing steam to the material to adjust its temperature and moisture content. This process initiates starch gelatinization under optimal temperature and moisture conditions, thereby enhancing the material's binding properties; simultaneously, it eliminates pathogenic microorganisms, thereby improving product safety. Upstream equipment may include a grinder, dosing scale, and mixer, while downstream equipment may include a cooler, crusher, grading screen, and packaging scale, forming a complete pellet production line.

Ring Die Pellet Mill Models and Specifications