Chocovision X3210 or Delta good for Bean to Bar?
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Tech Help, Tips, Tricks, Techniques
Rob:
Continuous tempering machines (like the ones from FBM, Selmi, and others) do not require the use of seed chocolate, as is required in batch tempering machines. You do not need to purchase a large capacity machine to get the advantages of continuous tempering technology, you can get machines with bowl capacities of 4-12 kg, which can translate to 10-35kg of tempered chocolate per hour.
Continuous tempering machines work by keeping the chocolate melted in a working bowl. The chocolate is pumped through a cooling pipe and subject to shear force to start the formation of the proper crystal structure and then spread the crystals through the chocolate. When the chocolate leaves the cooling pipe and exits the spout it is in temper. Unused chocolate is returned to the working bowl where the crystals are melted out before the chocolate is pumped through the cooling pipe again.
Without going into too much detail (which would fill a book - which I am in the process of writing), there is a balance that needs to be maintained between the temperature of the melted chocolate in the bowl and the temperature of the cooling pipe. The temperature of the cooling pipe is lower than the temper point - what is important is that the temperature of the chocolate as it leaves the cooling pipe is correct. Often (usually), the melting point and the temper point are different in a continuous tempering machine than they are when hand or batch tempering.
The advantages of continuous over batch tempering (in addition to not requiring seed) are:
From a cold start, you can start work in 20-30 minutes or less in a continuous temperer. From a warm start (melted chocolate in the bowl) it can be less than 10. In even a small batch temperer you can be talking 30 minutes to an hour or more.
No long waits between batches. In a batch temperer, when you finish a bowl of chocolate you have to wait for a new batch to temper - which may or may not involve manual intervention. That might take an hour or more to get ready - a long break in the middle of a busy production schedule. With a continuous tempering machine the warm restart (add melted chocolate when the bowl is down by 25-33%) is extremely fast. This is why you can get 2.5 to 3.5x the bowl capacity in hourly throughput.
More consistent crystallization. Because of the nature of the system, most continuous tempering machines are better at holding a chocolate in temper throughout a long working day and can tolerate changes in the ambient environment automatically. Especially, the chocolate has a tendency not to thicken up over the course of a long shift. This is because the crystals are constantly being melted out and the chocolate is being re-tempered. All modern continuous tempering machines have computers on them to regulate the tempering process. With a batch or in hand-tempering, the operator has to have the experience to know what to do when the chocolate goes out of temper.
Please note that a continuous tempering machine (or any tempering machine, actually) is not a substitute for knowing how to hand-temper chocolate. Anyone who is experienced at hand-tempering chocolate will be able to get the best out of any tempering machine, irrespective of the technique employed.