Wood pellet press or pellet press machine has been used to make feed pellets for a long time, they have being very successful in the animal feed industry and even today lead a way for making pellets for animals. But with people’ awareness of energy saving and environmental protection, pellet press machines have improved important part in the press and make them quite suitable for processing high density pellets like wood pellets for home heating use.

Wood pellet press is the core piece of pelletiziing equipment in the wood pellet plant. There are various different classification schemes of pellet mills. Generally speaking, small scale pellet press and large scale pellet press. Small scale pellet press often the same as flat die pellet mill which is quite fit producing wood pellets on a small scale just for residential use. Large scale pellet press always refers to processing pellets on a large scale for industrial purpose. Flat die pellet press emerges first and ring die pellet press comes later. The flat die pellet making machine works on vertical principle, small in size and is affordable for most consumers. However, the ring shape pellet press is much bigger than the flat die design, the rollers just part of the die.
  
Wood pellets made by wood pellet press is a very popular renewable fuel on current market and meets most of today's concerns for renewable energy and provides advantages to meet environmental concerns.

According to different using purposes, wood pellet press machines can process these pellets into different lengths and sizes, always the wood pellets themselves always have a cylindrical form from 6-8mm in diameter and must no longer than 38mm. After made into uniform solid pellets form, pellets will be easily managed, they are free flowing, virtually dust free fuel. According to the Pellet Fuel Institute (PFI), an association of stove producers, fuel producers and their suppliers, has established two residential fuel standards for wood pellets. They divide wood pellets made by wood pellet press machines into two grades: Premium Grade and Standard Grade. The two standards help fuel consumers to select the wood pellets best suited to their particular stoves or furnaces.