Chopin CD1 Mode D'emploi page 40

GB
lever arm
40
Laboratory Mill CD1
■ Reduction: Pour the semolina into the feed-hopper of the
reduction system. Start the motor by turning on the left-hand switch
(clockwise) which controls the distributor-reduction roll and sieve
unit. Reduction time obviously varies, depending on the amount of
semolina extracted during the break stage (around 3-5 minutes).
When the semolina has been reduced, wait approximately 1 mn 30
for the sieving to be completed and for the sieve to empty itself.
Clean off the scraper of the bottom smooth cylinder with a brush
(can be seen through the rear sight hole) and with the motor
switched off. Start up motor again for 10 seconds.
Two fractions are obtained:
❏ at the far end, reduction overtails.
❏ in the collecting-pan, reduction flour.
Usually, grinding local wheat with a generally floury structure
requires only one reduction to obtain a flour extraction suitable for
the Alveograph test (included between 55 % and 60 %).
For partially or completely vitreous wheats, a second reduction
should nevertheless be planned. Take the reduction overtails and
proceed as previously indicated.
The decision to use one or two reduction stages depends on the
percentage of semolina obtained during the break stage: if this is
- less than 48 % of the wheat processed
- more than 48 % of the wheat processed
■ The time for one grinding of local wheat should not exceed 12
minutes. Strong wheat takes about 15 minutes.
The total yield of the milling must be better than 98 % (including
moisture loss), the repeatability of the extraction ratio with the same
wheat conditioned under identical conditions being ± 1 %.
appendix 2 shows a model grinding report.
■ Additional 250 g weights supplied with the mill can be added to
each lever arm of the reduction system'moving cylinder. The
purpose of adding these weights is to increase pressure between
the two reduction cylinders and, also, to increase the action of these
cylinders on the endosperm fractions which form semolina and on
the starch granules of the semolina. By increasing pressure, the
degree of starch damage can be controlled.
❏ These additional weights should not be used for standard Alveo-
graph milling.
❏ On the other hand, they can be used with laboratory mills in order
to accurately adjust the P and G values obtained during test milling
to the results obtained from industrial flours (according to the char-
acteristics of the diagram and setting). They can also be used to
improve the results of certain alveographs which over a period of
time are no longer satisfactory (curves too long).
1 run
2 runs.
Instruction manual
02/2017