Tech Team · Kintek Solution

Pellets used in extrusion typically range in size from 0.3 to 1.5 mm, although specific sizes can vary depending on the intended application and the equipment used. The uniformity of particle size in pellets is crucial for ensuring consistent flow properties and performance in various processes.

Detailed Explanation:

1. Standard Size Range: The text indicates that pellets are typically sized between 0.3 and 1.5 mm. This range is common in many industrial applications where pellets are used for compaction and drug layering techniques. The smaller size helps in achieving better dispersion and uniformity in the final product.

2. Adjustment for Specific Needs: Depending on the specific requirements of the application, such as the need for transparency or thickness, the size of the pellets can be adjusted. For instance, the text mentions aiming for a pellet around 2mm thick and transparent, which might require adjusting the amount of powder used. This suggests that while there is a standard range, customization is possible to meet specific product specifications.

3. Preparation Techniques: The size of pellets can be influenced by the preparation techniques used. For example, pressed pellets are prepared using dies and a press machine, and the choice of die type (flat disc or cylinder) and size (ranging from 10 to 43 mm inner diameter for rings and cups) can affect the final pellet size. The ease of pelletization can also be influenced by the characteristics of the powder sample and the use of a forming agent (binder) if pelletization is difficult.

4. Raw Material Size Requirements: When preparing pellets, the size of the raw material after crushing is crucial. The text specifies that the general raw material size after crushing should be less than 5mm, with the specific size determined by the expected particle diameter and the size of the die hole of the pellet machine. This highlights the importance of controlling the initial particle size of the raw material to achieve the desired pellet size.

5. Particle Size Reduction: To enhance the quality of the pellets, it is recommended to reduce the particle size as much as possible using crushers, grinders, and millers before pressing the pellet. A commonly accepted particle diameter is 40 µm or lower, which ensures better compaction and uniformity in the final pellet product.

In summary, the size of extrusion pellets can vary but typically falls within the range of 0.3 to 1.5 mm. The size can be adjusted based on specific application needs and is influenced by the preparation techniques and the initial size of the raw material. Controlling and optimizing these factors is essential for producing high-quality pellets with desired properties.

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