... stalks ,nutshell, coconut shell ,etc Working principle:Briquette machine uses a large screw to grind, compress and ... fiber under high pressure and temperature.In the briquetting process lignin serves as the glue and ... to form into various moulds of high density briquette, such as hexagonal,quadrangular, square,etc. As ... Thank you ! good quality wood charcoal briquette machine with favorable price