Pellet construction characteristics change depending on the raw matter being processed, and the equipment used. Many raw materials contain sufficient natural binding properties due to their lignin content. Lignin is is the untreated carbohydrate, which gives wood its strength.

Some biomass materials have more lignin that others, for example biomass compared to grass. On the other hand depending on the density of the raw material, plus the type of equipment used, influences if the lignin can be properly utilized to form pellets. Where there isn’t sufficient lignin, or the lignin cannot be utilized, supplementary binders can be used. Water and vegetable oil, among other oily waste wood can be used as binders, however their inclusion rate has to be quite high, for example up to 30%.

They also generally do not make a pellet of ample density in addition to durability, low inclusion industry standard pellet binders are more suitable. Industry standard low inclusion binders usually require only a 0.25-1% inclusion rate. Biomass pellet manufacture compared to grass pellet construction for example, is a far more fuel intensive process. The wood generates increased resistance as it passes through the die, through its increased density.

Therefore industry standard binders can also be used to lubricate the die during biomass pellet production. Lubricating the die has multiple payback in the pellet mill. Lubrication can raise productivity, lessen wear on disposable parts in addition to raise biomass pellet quality.

Learn more about Pellet Die

Using low inclusion binders to also lubricate the pellet mill die during manufacture has multiple benefits. One of the reward is increased productivity through reduced resistance because of the die. Even on the other hand resistance is related to compression, pellet quality can still be maintained because of the additional binding properties of the binder. The lubrication can also raise die as well as roller life within the pellet mill. Also the reduced resistance also reduces fuel consumption during production. By an increased productivity along with reduced fuel demand in addition to increased life of consumable parts, the additional charge of the binder is easily recovered.

Read more about Straw Pellets

As stated many raw materials do have sufficient natural lignin to act as a pellet binder, though releasing that probable in a small pellet mill can be difficult. Utilizing lignin as a binder relies on adequate heat and pressure generated in the process. This may not be an issue in the small pellet mill when processing grass, as it much easier to heat the lignin to the required temperature as most grass has a low density. Producing pellets from biomass however can be much more difficult, as well as therefore requires a binder.

For more information on Small Pellet Mill

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