... coconut shell ,etc Working principle:Briquette machine uses a large screw to grind, compress and extrude the biomass into briquettes. The natural lignin ... wood together,thus binding, compressing the biomass to form into various moulds of high density briquette, such as hexagonal,quadrangular, square, ... my best to satisfy you. Thank you ! good quality wood charcoal briquette machine with favorable price