... straw dust, Mustard stalk and cotton stalks ,nutshell, coconut shell ,etc Working principle:Briquette machine uses a large screw to grind, compress and ... binding, compressing the biomass to form into various moulds of high density briquette, such as hexagonal,quadrangular, square,etc. As your ... my best to satisfy you. Thank you ! good quality wood charcoal briquette machine with favorable price