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Model
A 15 DC 15 tons/hour
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Model
A 30 DC 30 tons/hour
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Model
A 60 DC 60 tons/hour
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Variable Speed Drives
for adaptability.
Easy to dismantle for
thorough cleaning
Ongoing research and
development
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Extremely gentle
destemming
action results in a high whole
berry count.
Crusher rollers run at different speeds, tearing the skin by a
shearing effect instead of
mashing the fruit. |
Durable Construction
Crushing Rollers adjustable from
0 to100 mm
Flexibility to Stem, Crush or
Stem & Crush |
The DC range
of machines can
be supplied as Destemmer or as
Destemmer Crusher with
attached crushing attachment.
Grape Intake:
Grapes are fed through the intake
funnel to the feed auger of the
machine.
Below
the feed auger is a trough
which consists of 2 sections.
Each section is hinged and can
be opened or closed manually or
by remote operation with a
pneumatic cylinder.
Destemming:
With
the feed trough sections in closed position, all the grapes
are moved
by the auger to the
destalking drum where the
berries are removed from the
stems. The stems are discharged
at the end of the cylinder.
The berries fall down directly
towards the crusher rollers, if
they have been fitted, or get
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discharged through the bottom
opening of the destemmer.
No destemming
or partially
destemming:
With the trough sections of the
feed auger opened fully, most of
the grapes by-pass
the
destalking drum.
These whole grapes fall down
towards the crusher rollers, if they
have been fitted, or get
discharged through the bottom
opening of the destemmer.
The trough sections of the feed
auger can be partially opened so
that any mixture of destemmed
fruit and whole clusters can be
selected.
Crushing:
The gap between the rollers of the
crushing attachment can be
adjusted from between
0 and 100 mm.
When crushing, the gap is
adjusted between 2 and 10 mm
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depending on the
variety, ripeness
and desired style.
No crushing with crushing device
attached:
The attachment does not have to
be removed as the gap between the
rollers is easily widened, usually up
to 50 mm of the possible 100 mm,
thus allowing the fruit to pass
through whole.
Variable
Speed:
The A 15 DC model is fitted with a
mechanical variable.
The A 30 DC and A 60 DC
machines, which are more often
than not operated by remote
control, are fitted at the factory with
a variable electronic drive with a
remote potentiometer. Alternately
the customer may prefer to have a
drive fitted in a central electrical
control panel at his crush pad.
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A vast amount of practical and
theoretical experience and
testing in many major wine
growing areas of the world, has
gone into the design of the
"magitec" destemmer crushers.
They are adaptable so that a
wide range of grape varieties can
be accommodated.
We strive for reliability and
durability when designing and
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developing the destemmer
crushers. Simplicity is our first
priority. For versatility we offer
variable speed drives for all
machines and manufacture two
styles of drums: the classical
segmented drum with square
openings, and the stainless
steel drum with round flared
holes.
The squeeze rollers are rubber
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coated to prevent any damage to
the pips. They run at different
speeds to obtain a shearing action,
tearing the skin to allow the free
flow of the juice instead of mashing
the whole berry into a pulp. They
are spring loaded, allowing the gap
to open when a foreign obstacle
gets in between, thus preventing
mechanical damage. |
Perfect Destemming is :
Zero maceration of the berries,
zero breakage of stems, zero
loss of berries and no jacks
among the fruit.
Perfect Crushing is :
Zero pulping of the berries, slight
rupturing of the skin to allow the
free flow of the juice and no
damage to the pips. Even with
perfect fruit under ideal feeding
conditions, this is but a dream.
Destemming Process
Initially the destemmer-crushers
were designed to crush the whole
cluster. It was the easiest way to
remove the berries from the
stems. This crushing of the stem,
however, resulted in an increase
of tannins. The berries also did
not come off whole and small
pieces of skin were lost with the
stems.
Aware of these shortcomings,
Hermann Amos Landmaschinen
Fabrik from Heilbronn, continued
to experiment and eventually
developed the first destemmer
crusher which destemmed and
separated the berries from the
stems before crushing them.
The "amos" principle has since
been copied by all renowned
manufacturers of destemmer
crushers.
A variable speed drive allows one
to adjust the speed so that jacks
are not broken off the stems
(beating too hard) and berries
remain attached to the stems
(beating too gently).
The beater bar and the drum
needn't have separate variable
drive. Although theoretically it
may sound advantageous, having
two drives may cause serious
adjusting errors.
The correct speed for destemming
is just fast enough to remove all
berries without producing jacks.
Separation of berries
from
stems :
Once the berries are removed
from the stems they must be
separated from each other.
Only whole stems can be
separated as jacks are similar in
size to the berries and will find
their way through the holes of
the drum together with the fruit.
It will happen in a drum made from
stainless steel sheet metal with
round flared holes, as well as in
a drum with a more complex |
shape and square openings
made from plastic material or
more durable aluminum alloy.
A variety of hole sizes for the
drum is usually available and is
selected according to the berry
size and condition of the stems.
The bigger the holes the more
jacks tend to get through together
with the berries - the smaller the
holes the more berries tend to
roll along the inside of the drum
towards the stem discharge
without finding an escape. It is
almost impossible to find the
perfect combination.
This tendency of the berries to
roll along a smooth surface made
us develop the complex shape
of our drum segments which
deflect the berry's path towards
the stem discharge, decreasing
the percentage of berries lost
with the stems. The rectangular
shape of the openings also helps
the berry to find its way through
a hole. Because the drums are
assembled from individual
segments which are manufactured
in two different hole sizes, the
drums can be made up in
numerous combinations and
easily be changed on site if
required. |
The rotation of the basket in the
same direction as the beater bar
seems also to increase the piling
up of fruit inside the basket.
Making them rotate in opposite
directions accelerates the
movement of the stems towards
the exit and reduces bruising of
the berries.
It is believed that the opposite
directions of the drum and beater
bar results in a gentler operation
with less cutting of the stems,
but this a myth as it is the relative
speed between the two and not the
direction of the drum and beater
bar that matters. Our A30 model
therefore no longer comes with an
option of either direction.
When the flow of grapes to the
machine is below its design
capacity, the quantity of jacks
usually increases. A section of the
drum can then be closed without
losing berries with the stems.
The section closed however, must
not be more than a third of the
total length of the drum.
Feed
The stems of some grapes are
extremely brittle and break even
before they are fed to the
destemmer. An offloading bin with
auger cuts the stems resulting in
an increased number of jacks.
A belt feeder or a slow running,
large diameter auger without
intermediate bearings, are
preferable.
A jack entering the destemmer
cannot be removed and will find its
way through the drum holes
together with the berries.
Interrupted Feed
Whenever the feed of grapes to
the destemmer is interrupted, the
stems inside the basket are not
pushed by the following ones as
they would be with a continuous
feed. This increases the holding
time inside the drum and jacks
(being cut off the stems) find their
way through the holes together
with the berries.
In a big pump receiving bin where
the surface of the crushed grapes
is visible, this phenomena can be
seen clearly, especially when the
destemmer runs empty. A great
frustration for wine makers, it is a
characteristic of all destemmer
crushers.
A continuous feed without
interruptions will help immensely.
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We also offer the
stainless steel
drum, but feel it
has no advantages
over our traditional
drum. |
The
speed of the machine has a
great influence on the best
possible separation of berries
from the stems. A slow speed
very often results in congestion
inside the basket which in turn
restricts the quick, free flow
of the stems towards the
discharge and blocks the path of
the berries through the holes,
macerating these by mashing.
An excessive speed breaks more
stems during the separation
process resulting in more jacks
and leads to more maceration of
the berries because of abrasion.
At the correct speed the stems
easily tumble towards the exit,
leaving space for the berries to
move towards the holes in the
drum.
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Please send us all your
questions relating to above.
We will try to answer them here as well as we can.
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