Difference Between Powder Content Rate and Crumbling Rate in Pelleted Feed
1. Definition & Significance
Powder Content Rate: The percentage of powder (usually fragments ≤0.6× pellet diameter) in the total mass of pelleted feed, reflecting initial powder content post-pelletization.
Crumbling Rate: The percentage of powder generated during transportation or handling (e.g., vibration, friction) relative to total weight, indicating pellet durability.
2. Testing Methods & Standards
Powder Content Rate:
Sampling point: Cooler outlet (immediately after pelletization).
Standard sieve: 2.0mm mesh; national limit ≤5%.
Crumbling Rate:
Sampling point: Finished product warehouse (simulating transport conditions).
Testing method: Rotary box test or Pellet Durability Index (PDI); national limit ≤10%.
3. Influencing Factors
Powder Content Rate:
Raw material quality (e.g., fineness of crushing, impurity content).
Pelletization process (e.g., die compression ratio, conditioning temperature).
Crumbling Rate:
Transportation conditions (e.g., vibration, compression).
Pellet hardness (related to curing degree and density).
4. Industry-Specific Standards
Livestock Feed:
Powder content rate: Swine feed ≤4%, duck feed ≤2%.
Crumbling rate: Generally ≤10%.
Aquatic Feed:
Powder content rate: Fish feed ≤1%.
Crumbling rate: ≤2% for carp fingerlings, ≤3% for adult fish.
5. Practical Impacts
Excessive powder content reduces feed utilization, while high crumbling rates increase transport losses and water pollution risks in aquatic feeds.
ST136B pellet durability tester is a special instrument developed and produced by Shandong Shengtai Instrument Co., Ltd. and fertilizer manufacturers in combination with the phenomenon of fertilizer powdering in production and application .High moisture absorption rate, uneven particles, high moisture content and other reasons may lead to fertilizer powdering.
ST136B pellet durability tester is used to simulate the crushing degree of granular fertilizer products in the process of transportation and transportation, so as to measure the pulverization rate of particles, so as to better adjust the production process, production equipment, production environment and fertilizer storage, etc.
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