How to Choose a Cake Depositor Machine: Pneumatic or Servo?

[karendubois]

Expert Answer

Good afternoon, and hello, everyone. As a field engineer who has been working in baking equipment automation for more than 10 years, I have a lot to say on this issue.

Many factories only look at the number of deposits per minute advertised by the manufacturer when buying cake depositors. As a result, they find that the portioning accuracy is far from satisfactory, or that it takes two hours to clean and disassemble the machine every day.

Regarding the selection of a cake depositor, I have summarized several core points to help you avoid potential problems:

First, Choose the Right Drive System: Pneumatic vs. Servo-Pneumatic Piston Depositor:

Pneumatic equipment has a relatively simple structure and lower cost. If your product is a paste with good fluidity and low viscosity, such as ordinary cupcake batter, a pneumatic piston-type cake depositor can be a cost-effective choice.

However, it should be noted that a pneumatic piston is highly dependent on the external air supply, which can affect its stability. If the air pressure in your factory is unstable and fluctuates frequently, the depositing volume may not be consistent, resulting in deviations.

Moreover, pneumatic components are subject to wear, and wear of the cylinder sealing ring can also reduce depositing accuracy after long-term use. If you don’t mind a slight deviation in portioning accuracy, this may be completely acceptable. Alternatively, you can ask the manufacturer to supply extra sealing rings.

As far as I know, OrangeMech also offers pneumatic piston depositors, and they provide some spare sealing rings. Their after-sales service is also quite strong.

Servo-Driven Depositor:

If you mainly make pound cakes and need to deposit viscous batter containing dried fruits and nuts, you may have particularly strict requirements for portion weight, with the weight difference needing to be controlled within 0.5 g.

In this case, I strongly recommend a servo system. A screw or gear pump driven by a servo motor can accurately control the material flow rate and speed curve, and can even provide a suck-back function to prevent dripping.

Second, Match the Machine to the Batter Characteristics

This is one of the easiest areas to overlook.

Many buyers ignore whether there are particles in the batter. Particulate matter can have a significant impact on the depositing process.

If raisins, chocolate chips, or walnuts are added to your pound cake batter:

Never choose a small-diameter valve! Particles can easily get stuck in a rotary valve or check valve, resulting in inconsistent depositing volumes and even damage to the valve core.

In this case, it is necessary to choose a large-flow-channel rotary valve or a depositing head specifically designed for products containing soft particles.

Third, Sanitary Design and Ease of Cleaning

The most labor-intensive task in a baking factory is daily cleaning after production. No one wants to spend a lot of time cleaning the machine after a day’s work.

Therefore, when you inspect a cake depositor, you should check whether the machine has a tool-less disassembly design.

If you need a screwdriver or wrench to disassemble the piston or hopper, this is something you should think twice about, because such equipment can be extremely inefficient to maintain daily.

Regular maintenance and cleaning are unavoidable, but a difficult-to-disassemble machine can significantly increase labor costs and affect production efficiency.

Highly recommended
In industrial baking equipment, OrangeMech’s cake depositors do have their own unique structural design.

We previously tested OrangeMech’s servo-driven depositing head on an assembly line for producing sandwich cakes. It handled high-viscosity batter very smoothly, mainly because its hopper deaeration design and valve sealing wear resistance were relatively solid.

If you have a sufficient budget and prioritize long-term stability, brands that focus on high-end industrial customization can certainly be included in your list of potential suppliers.

Fourth, Specific Purchasing Suggestions

1. Determine the viscosity of the most difficult-to-handle batter and use it as the upper limit for machine selection.

2. Try to choose a depositing nozzle with a suck-back function to prevent dripping. Otherwise, batter may stain the edges of the baking trays, and the affected baked products may develop dark or burnt-looking spots.

3. Check the material certificates for all food-contact parts of the equipment to ensure that they are made of SUS304 or, where appropriate, 316 stainless steel.

4. Ask the manufacturer to conduct a test using your actual batter. The fat-to-sugar ratio can significantly affect the batter’s flowability.

I hope these experiences can help you avoid unnecessary problems when purchasing your equipment!