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The ring die is most costly replaceable components in any feed pellet mill. It is not recommended to replace it very often, as it increases production costs. essential to maximize its service life Shanghai Yuanyuda International Trade Co., Ltd. presents effective solutions on how to get the most out of the service life of a ring die without compromising the quality of the pellets.
Select the Right Die Specification for Your Recipe
The fastest way to shorten the life of a ring die is to use it with an improper specification. There are two key factors: compression ratio and hole diameter. Compression ratio is the effective length divided by the hole diameter. A high compression ratio is used for materials that are difficult to pellet but it accelerates die wear. Low compression ratio will prolong the life of the die but can result in weak pellets. Use the correct die size for your feed formula. When producing aquatic feed that requires high durability, accept that some wear is inevitable. If the livestock feed is simple, it is better to have a lower compression ratio, as it will provide a longer life with minor reduction in pellet quality.
Proper Break-In Procedure for New Ring Dies
The inner surface of a new ring die is smooth and thus, grips material poorly. If not properly broken in, the rollers slide rather than push material through holes. This slippage produces heat and wear. Use an abrasive material, like a grain/sand/oil mixture, to break in a new die for the first 15-30 minutes. Start at 60% of the rated production rate, then gradually increase to full capacity over 1 to 2 hours. This process buffs the inside surface without harming it. The die that is broken in properly will produce pellets efficiently and with a slow wear.
Maintain Optimal Roller to Die Clearance
The space between the roller shell and the ring die is critical. If clearance is too great, material will not be forced into holes by the rollers. The mill is less efficient and the die wears out unevenly. If there is too little clearance, metal-to-metal contact occurs. This breaks the roller shell as well as the die surface. The optimal clearance for most types of feeds is 0.2 to 0.5 millimeters. Make sure you use a feeler gauge on this gap when you change oil. Adjust as needed. When set correctly, a good gap will allow the material to wear, rather than the metal.
Control Feed Moisture and Conditioning
Well-conditioned feed increases ring die life. Dry materials create excessive friction, raising temperatures and risking die cracking. Excessive moisture causes holes to become clogged and forces pressure to be increased to get the material through them. Set the conditioning temperature at 70-90℃. Most types of feeds should have a moisture content of 15 to 18 percent after conditioning. Apply steam or water using an accurate liquid addition system. A regular conditioning process can minimize the die wear.
Rotate the Ring Die Periodically
do not wear uniformly across their surface， The area under the feed guide cone is exposed to more material and will wear out faster. Most dies are capable of being set in more than one mounting position. By turning the die over every 500 to 1000 tons, wear is distributed evenly over the die. double the die’s service life compared to running it in one position.Be sure to label the die and housing to track rotation history. Maintain records on tons produced in each position to establish optimum rotation periods for your operation.
Use the Correct Roller Shell Texture
Roller shells can have a variety of surface finishes. Fine corrugation is suitable for small hole dies and soft materials. Coarse corrugation or dimpled surface is better for large hole dies and fibrous ingredients. The incorrect texture results in the rollers slipping instead of the feed material. Slipping creates heat and polishes the face of the die, which decreases the capacity of the die. Match texture of roller shells with your ring die and feed formula. Change the texture of the roller shells if they become smooth. damaged ring dies often result from worn roller shells.
Summary
To achieve an extended ring die life, one must focus on proper specification selection, standardized break-in procedures, precise clearance adjustment, consistent feed conditioning, periodic die rotation, and matching roller shell textures. Both of these factors help to enhance the life of the dies and reduce production costs. With years of experience working in the feed industry, Shanghai Yuanyuda International Trade Co., Ltd. offers high quality ring dies, roller shells and spare parts for domestic and international models.
