The key to choosing a ring die is to select the appropriate die hole form, opening rate and the die L/D ratio according to the production materials and output. The die L/D ratio(effective thickness/die holes diameter), is an index reflecting the extrusion strength of the pellet machine.
The effect of the die L/D ratio on granulation
Ring die has a small L/D ratio, the extrusion time of the material in the die hole is short, it is easy to extrude, the production efficiency is high, and the power consumption is low, but the quality of the produced particles will be loose, which is likely to cause high powder content and long particle length, uneven and other quality problems.
Ring die has a large L/D ratio, the material is extruded in the die hole for a long time, the production efficiency is low, and the power consumption is also increased. The output particles are dense, hard, strong and smooth. However, with the increase of the effective length of the die hole, the granulation output is obviously reduced, and even blocking the die hole causes the plugging mechanism to not granulate. In order to obtain the best granulation performance and achieve the best output and quality, it is very important to choose the appropriate ring die L/D ratio.
How to choose the right L/D ratio
There is no fixed standard for the compression ratio of the ring die, which is related to factors such as production raw materials, die hole diameter, and production varieties. Therefore, when designing the L/D ratio of the ring die, the nutritional value, production cost and growth effect of the pellet feed should be comprehensively considered. The best die L/D ratio is selected according to the variety of livestock and poultry, the growth stage and the pressing raw material. And under the premise of ensuring the effective length of the die hole, the thickness of the ring die and the decompression hole are increased.
When you do not have certain design drawings and data, Jinding will give you appropriate advice.
