The type of die used in pellet mills is primarily categorized into two main types: Flat Die Pellet Mill and Ring Die Pellet Machine. These dies are integral to the pelletizing process, where raw materials are compressed and formed into cylindrical pellets.
Flat Die Pellet Mill: The flat die pellet mill features a die that is flat and typically has holes through which the material is extruded. This type of mill is characterized by its simple structure, making it small, light, and portable. It is cost-effective compared to the ring die pellet mill and is favored by farmers, home users, and small feed production plants due to its ease of operation and maintenance. The flat dies are designed to be reversible, allowing users to extend their lifespan by flipping them over when one side wears out.
Ring Die Pellet Machine: Although not detailed in the provided reference, the ring die pellet machine typically features a cylindrical die with holes around its circumference. The material is forced through these holes under high pressure to form pellets. This type of mill is often used in larger-scale operations, such as for producing animal feed, wood pellets, and fuel pellets for pellet stoves.
Small-scale Pellet Mills: Small-scale mills, such as screw-type pellet mills, use a die that functions as a mold to shape the uncompressed powder. The die holds the material in a shaped pocket, and a platen compresses the powder to form the pellets. Some platens are heated to enhance the pellet's structure and speed up the process, while others may include water ports for quick cooling.
Material Grade for Pellet Mill Dies: The dies in pellet mills are made from various grades of materials, including x46CR13 (high chrome or stainless steel), 20MnCr5 (alloy steel), and 18NiCrMo5 (a higher alloy content steel). The choice of material depends on the specific requirements of the pelletizing process, such as the hardness and wear resistance needed for the materials being processed.
Pellet Die Configuration and Nomenclature: Key terms used in specifying dies include the hole diameter, which determines the actual size of the pellets. The hole diameter varies according to the application, with smaller diameters typically used for aquatic feed and larger diameters for poultry and cattle feed.
In summary, the type of die used in pellet mills is primarily either a flat die or a ring die, each suited to different scales of operation and specific applications. The choice of die material and configuration is critical to the efficiency and output quality of the pelletizing process.
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