Most enquiries arrive with a straightforward question: which filling machine should we buy? The honest answer is that there is no best machine — only the best fit for a specific product, container and output target. That said, the decision framework is consistent, and it starts with viscosity.
Step 1 — Start From Viscosity, Not From Capacity
Capacity is the number buyers quote in enquiries, but viscosity decides which technology can hit that capacity accurately. Below roughly 20 cP, almost any pump type works. Between 20 and 100 cP, peristaltic pumps and servo pistons remain comfortable. Above 100 cP, you are into gear pump or bellows territory, and above 500 cP you should be talking to a supplier about product conditioning as much as about the machine.
Step 2 — Price The Accuracy, Not The Bottle
A ±0.5% filler that runs at 6,000 bph can be cheaper over a year than a ±1.5% filler running at 8,000 bph, once overfill and give-away are counted. Overfill is invisible on the invoice but very visible in the cost of goods. Ask any supplier to state the accuracy tolerance and the actual test method behind it — the answer separates manufacturers from suppliers.
Step 3 — Count The Changeovers
If you run one product for a month, a servo piston machine with stored recipes is over-specified and you will pay for capability you never use. If you run six SKUs across two shifts, a single-speed machine will cost you more in changeover hours than the servo premium saved. Count the changeovers per month before deciding what level of automation pays back.
The right machine is the one that hits your specification on day one and still hits it on day three hundred.
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