Hydraulic Press for Making Sawdust Briquettes

Re: Hydraulic press for making sawdust briquettes

Commercial Feed pellet mill uses two rollers to push product against a outer ring with holes drilled in it( die ) the die spins around the two rollers..The clearance to die is adjustable. They soften the Feed with steam first.This is for animal feed pellets.I would think they have to dry the pellets afterwards or maybe the die pressure creates enough friction/ heat to do it for them. I have not seen them in operation.
I have worked on them but do not know all the operation only the machinework that makes up the equipment.
Sawdust i would imagine would require higher forces to bind it together and the resulting pellet would have to be moderately dry to burn well i would think. Force on area is pressure you could work backwards on your press if the gauge is accurate to calculate forces. You know your starting volume to finished volume as well and the area of the puck.
You can also play around with water content to see how that effects puck "solidification".
You may not get enough frictional heat in fixed die pressing, through dies create heat by the frictional drag on the walls of the die a property called possions ratio comes into effect.
With Puck being larger than a pellet the distance water has to travel from the middle to the edge is longer so i would also think the time for it to dry out would be longer as well.
That may be a disadvantage.
Pellets have small area so moderate forces on small area gives high pressures to "forge" the pellet, increasing the area the forces have to be much larger to give the same pressures.


The cost to create the compression forces needed (electricity cost if electric motor driven) would need to be noted as if high forces and lots of power is used it may be better to leave the sawdust as is and make a burner for sawdust that is efficient rather than having the additional costs in processing it to another state.

If you still want to i suppose initially you could convert your press into a cyclic process, fill ,press,open, press out puck; close,fill etc (If you can get it to bind properly in initial testing)
by a hydraulic powerpack and some proximity switches and chutes dropping product in and out.
The small pellets are a rotary process not a cyclic one and production output would be higher with them. Have less moving parts and components that are not as costly.

If you could lower pressures by using a non hazardous binder a natural product possibly that could be burnt it would lower electricity costs but you would have binder costs in additional to raw product.

Well thats some things to have a look at.

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I wish there was a way to burn wood shavings efficiently on my wood burner at home. I have often thought about one of the cheap briquette makers, it would be great to just fill it up and leave it to do it's stuff although I never thought about how much electric they used I do know someone who got one and it kept breaking down, I think the ram that compacted the shavings had more pressure than the build of the machine could handle.

My shavings go off for horses and chickens which always seems a waste when they could be heating my house.
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My old workshop had one of those stoves designed to burn wood shavings and sawdust, it was really good, you just filled it up on a morning and it happily smouldered away all day.I wish there was a way to burn wood shavings efficiently on my wood burner at home. I have often thought about one of the cheap briquette makers, it would be great to just fill it up and leave it to do it's stuff although I never thought about how much electric they usedI do know someone who got one and it kept breaking down, I think the ram that compacted the shavings had more pressure than the build of the machine could handle.My shavings go off for horses and chickens which always seems a waste when they could be heating my house.

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