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Juicing crop feedstock for ethanol - Page 2

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Posted by Curbie on April 16, 2010, 5:07 pm

Version two, cheaper and the benefit of mastication between the center
and rear roller, also there seems like the additional benefit of
adjusting the top bearings horizontally to simultaneously change the
gaps (pressures) between the center and both front and rear rollers,
one gap would narrow increasing the pressure, while simultaneously
increasing the other gap.

The notion being that the wider gap would be use for feeding the
feedstock between the front and center rollers, and the squished
output from the front would be further juiced between the narrower gap
between the center and rear roller.

I'm thinking that a grid of small holes drilled around each roller
would aid in both feeding and some mastication due to the opposing
directions and the center and rear roller



Posted by Jim Wilkins on April 16, 2010, 5:49 pm

Probably the easiest roller press to make and experiment with is the
classic olive press, with a roller running around in a tight circle.
The bed can have raised rims to keep liquid out of the bearings.

Since the roller can turn at only one speed most of the grinding
surface is shearing as well as pressing. You can put a scraper
opposite the roller to bring material squished to the outside back
into the track. In its simplest form it is more suited to batch than
continuous production but it can be automated, like feed near the
center and let the crushed pulp fall off the outer edge.

The initial investment is a tiny fraction of that for calender rolls
and adjustable bearings, you could for instance make a prototype out
of a barbell weight and a used disk brake rotor.

Of course you would have to dice the stalks first, like slicing


Posted by Curbie on April 16, 2010, 8:29 pm


Calender rolls, I've only heard that term use with paper rolls (huge),
these rolls are currently designed at 4" Diameter x 12" Long, are we
thinking  in the same scale? The juicing is time sensitive, I'll have
a 5-7 day window (before flowering) to juice 1 acre of stalks so I
feel I'll be better off using a continuous hammer-mill and losing some
juice than any slower batch type process.

Finding a way to both continuously juice AND juice as completely as
possible is my goal, so far I think the roller type will juice better,
but the hammer-mill has DIY appeal and could be used with tubers also.
I don't know, maybe a hammer-mill and a separate pulp wringer.

Thanks, I'm thinking this juicing idea needs more reseach.


Posted by Jim Wilkins on April 17, 2010, 2:29 pm

That's why I've suggested small-scale batch prototypes before you
commit to building an expensive continuous processor. In a batch
process you can isolate the various steps to measure their performance
and then optimize each step separately.

Perhaps you could obtain a small supply of stalks and refrigerate them
while you experiment. How similar are rhubarb or celery?


Posted by Curbie on April 18, 2010, 4:52 am


Good advise, as usual.

I was thinking there was already a lot of testing done on small-scale
batch prototypes; vegetable juicers for home made beverage juice. So I
was hoping to piggy-back on their work and went to the juicer review
sites for info and google patents for designs.

I was thinking I could plant a small area, JA are kind like a weed and
it will take a few years to get settled in a new home anyway, so it
seems like I can start a small patch for testing and by the time I'm
ready to starting process testing, then production testing, and
eventually ramp-up for production, they will have grown in to fill the

They are part of the sunflower family with many small flowers per
stalk, instead of one big one.

I went to a BBQ at a friends house today and was talking with him
about my plans and options and told him about the different type of
beverage juicers and the roller juicer idea I got from you and z, also
how well a sheet-metal roller had "juiced" a finger-tip as a kid, and
he told me a story of taking his family to a Sugar-Cain plantation
while on vacation, they we're using a three roller press similar to my
design as he described it. I will search the web tomorrow to see if I
can the some pictures.


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