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What you should know about the compression ratio of the sawdust pellet machine ring die

Pellet Machine & Compression Ratio of Ring Die

Compression ratio of sawdust pellet machine = effective length of die hole/diameter of die hole.

First of all, on the premise of choosing high-quality ring die, you should choose a sawdust pellet machine that suits you. According to the specific gravity of the production material, select the appropriate die hole form, opening rate and compression ratio.

On the premise of ensuring the strength of the ring die, try to increase the opening rate of the ring die as much as possible. For some types of materials, under the condition of ensuring a reasonable compression ratio, the ring die is too thin, resulting in insufficient ring die strength and explosions during production. Mold phenomenon, at this time, under the premise of ensuring the effective length of the mold hole, increase the thickness of the ring mold and increase the pressure relief hole.

The ring die compression ratio refers to the ratio of the effective length of the ring die hole to the minimum diameter of the ring die hole, and it is an indicator reflecting the extrusion strength of sawdust pellets.

The larger the compression ratio, the stronger the extruded pellets. For the ring die compression ratio of straight holes, the effective length of the ring die hole is the total thickness of the ring die, and the minimum diameter is the diameter of the die hole itself; for the release stepped hole and the outer tapered hole, the die The effective length of the hole is the total thickness of the ring die minus the length of the release hole or the length of the outer taper hole. The aperture of the small diameter section is the aperture for calculating the compression ratio; for the compression stepped hole and the inner tapered hole, This situation is quite special. Generally, the entire ring die thickness is taken as the effective length of the die hole, and the smallest diameter is the aperture of the small diameter section. Of course, the meaning of the ring die compression ratio calculated in this way is different from the first two cases.

There is another important indicator to measure the quality of ring die—roughness. Under the same compression ratio, the greater the roughness value, the greater the extrusion resistance of straw particles, and the more difficult it is to discharge the material. Excessive roughness also affects the quality of the particle surface.

The appropriate roughness value should be between 0.8 and 1.6.


It is important to learn how to choose the compression ratio and mold of the sawdust pellet machine that suits you.

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