I usually get my logs off a truck, so I dont see the brush or small limbs. Another big waste of wood is all the sawdust from the saw. I have done a little (just read about it mostly) research into making pellets. Chips need to be dry and something added to make the pellets stick together. Pellets are made using a balling machine and logs are made using a press. I Think a press could be ran off the processor hydraulics easy enough and might be something I consider adding in the distant future. Since the wood needs to be a certain level of M/C, unless one wanted to take a dryer into the woods, I cant really see it being feasible to make pellets in the woods where the trees are being harvested.Biggest problem I see is you can't easily process normal "big" trees. You have the main trunk, maybethree to five feet diameter, then oodles of heavy branches, etc. Ton of waste if you can't process the branches, and only cutting little trees is a waste, they are just starting to put heavy growth on, so why cut them then? Most of these processors the wood has to be straight, perfect or near, not too large diameter, etc.
I am almost thinking it might be better long term to have a machine that can process the whole tree and make pellets or processed bricks/logs. Then everything can be automated once the tree is on the ground and the final product palletized.
Currently, the bigger logging outfits around here are chipping all the brush and selling it for biomass. The biomass is then shipped to power plants where it is mixed with coal to produce electricity. Not much brush is being left in the woods anymore.