Wartmann WM-2002 OP Manual page 8

Food preparation
Use raw materials
Always work with pure, raw, materials. Nuts or seeds that
have been roasted can't be used to press oil from. Most
peanuts being sold are already roasted. Peanuts can be
roasted in their shell. Having a shell does not mean that the
peanuts are not roasted. Raw peanuts have a distinctive
different taste than roasted ones. In case of any doubt, ask
your supplier for advice.
Packed coconut bits that are factory treated (defatted) can
no longer be used to press coconut oil from. Examine the
oil content displayed on the packaging, if it is below 70%,
the coconut shreds are not suitable for pressing.
Peeling
You must always remove the shells from nuts before putting
them in the Wartmann® nut oil press. In general, seeds
require no shelling.
Break into smaller pieces
The Wartmann® nut oil press can process nuts up to the
size of peanuts. Larger nuts, such as walnuts, should be
broken down into smaller pieces. You may use a multifunc-
tional cutter to quickly cut nuts into smaller pieces.
Remove Sand and Stones
Remove sand and any small stones or other materials that
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would contaminate your raw materials. Small stones, metal
parts and sand may irreversibly damage the Wartmann®
nut oil press.
Moist Content
The moist content of your raw materials is very important
for a successful press result. For example: fresh wall nuts
should be (air) dried before pressing them. As a rule of
thumb the moist content should be approximately 10%. If
the moist content is much lower than 10%, then the press
cake may be too dry and hard. The press cake will block
the press and it may stop. If the moist content is much high-
er than 10%, then the press cake could turn into a moist
pulp and no oil will be produced.
A simple method to determine the water content is to take a
sample of the raw materials and weigh it. Dry the sample
at 105oc for 12 hours in a (ventilated) oven or dehydrator,
then weigh it again. The water content is calculated as the
weight loss divided by the initial weight x 100%.
Water % = (weight loss / initial weight) x 100%
If your raw materials are to dry, then you may try to store it
in a damp environment (such as a sealed box with a small
compartment of water) for 24 hours. When in doubt, you
should consult your raw materials supplier about the best
moisture content for pressing.