Opinion on Continuous v Batch Tempering
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Tech Help, Tips, Tricks, Techniques
Freddo, Sebastian -
I get asked the question about depositing thick chocolates (aka 2-ingredient chocolates, or chocolate with little or no added cocoa butter and/or lecithin) all the time. In fact, I - in conjunction with intrepid and stalwart customers - worked with FBM to develop upgrades to some of their continuous machines specifically to handle thick chocolate.
The basics are a heavier-duty motor in conjunction with a gear box at a different ratio to deliver more low-RPM torque driving the temepring auger, plus beefed up bearings to handle the load. These machines also offer the ability to change the speed of the tempering auger (increasing the dwell time in the tempering pipe results in more even spread of crystals through the chocolate) in 1% increments. Finally, through the use of a pneumatic valve that diverts the flow of chocolate, the continuous tempering cycle is never interrupted, as it is when the auger is stopped and started to regulate the flow for depositing. Taken together, this means that the FBM machines handle chocolates that other brands of continuous tempering machines struggle with.
That said, the smallest machine has a tempering capacity of up to 75kg/hr which is quite a bit more than 50kg/day. Assuming 4, 70gr cavities/mold and 2 molds/minute, that's a throughput of about 65kg/hr assuming you have enough molds and can work without interruption. That means you can do an entire week's worth of bar production in a single day rather than spending an hour or three every day molding bars.
I can tell you from experience - as can several users of these machines - that getting the dosing heads right for these high-viscosity chocolates can be a challenge.
FBM does have timed depositors on all of their machines, and we've found that the smaller machines can be used with two-ingredient chocolate, but it can take some finessing with the settings of the machine to get them to work consistently. We have chocolate makers using machines with 4 and 12kg working bowls successfully depositing 2-ingredient chocolate but it takes time and patience to dial in on the correct procedures. Over the past two years we've learned a lot about how to do it and do a pretty good job.
Something like a Savage melter will work but you'd want their measured doser, which has its own challenges with staying warm enough to keep the chocolate fluid ... but not too warm. If you don't use a measured depositor then you need to figure out an efficient way to fill the molds.
You could buy a volumetric depositor with a heated hopper. You want one cylinder per mold cavity for even dosing. The advantage is that these are incredibly accurate and can easily handle high-viscosity products. They work with an existing tempering machine, but the combination (e.g., Savage kettle and depositor with four heads) is going to cost close to $20k. FBM's Unica is in the same price range.
:: Clay