1. Strict moisture requirements
The moisture content of the raw materials for the wood chip machine must be strictly controlled. No matter what type of wood chips it is, the moisture content must be maintained within a certain range (preferably between 14% and 20%). If it is too dry, it will not form properly; if the moisture content is too high, it will easily become loose.
2. The adhesive force of the materials themselves
The raw materials themselves must have adhesive properties. If they don't, the products produced by the wood chip machine will either be unformed or loose and prone to breaking. Therefore, if you see materials that don't have inherent adhesion but can still be pressed into pellets or blocks, it means that the raw materials have been tampered with, or have undergone fermentation, or have been added with adhesives or similar substances.
3. Adding Adhesive
Pure wood chips can be used to make wood chip pellets. No additional adhesives are needed as wood chips are a coarse fiber material and inherently possess some adhesiveness. After being compressed by the wood chip pellet machine, they will naturally take shape and will be very sturdy. The pressure of the pellet machine is extremely high.
4. Can different types of wood chips be mixed together?
It is stated that pure wood chips are used, but it is not strictly prohibited to mix in other types of wood chips. Various wood chips, sawdust, redwood, poplar wood can all be used, as well as the waste leftovers from furniture factories. More broadly speaking, things like crop straw, peanut shells, etc. can all be used as raw materials for the wood chip mill. Of course, the pellets produced cannot be called wood chip pellets, but rather straw pellets.
5. The size of the raw materials after being crushed
Raw materials such as sawdust and branches must be crushed by a crusher before being granulated. The size of the crushing should be determined according to the diameter of the expected pellets and the size of the mold holes of the granulator. If the crushing is too large or too small, it will affect the output and even cause no material to be produced.
6. What to do when the raw materials are moldy?
The raw materials have gone moldy and turned black. The cellulose within the wood chips has been decomposed by microorganisms, making it impossible to be pressed into qualified pellets. If it must be used, it is recommended to mix it with 50% or more of fresh wood chip raw materials. Otherwise, it cannot be pressed into qualified pellets.