... density 3.Raw materail can be sawdust, straw, coal powder straw briquette machine 1. Our straw pellet machine (Patent NO:200720157337.9 ) ... from Germany( KAHL )13 years ago. And our patent--Taper Shape Rollers reduce the friction between flat die and rollers, so ... wood sawdust, corn stalk, rice husk, cotton stalk, weeds, crop straw, paper, plastic, cocopeat, bran, home wastage, factory reject and so ...