Capacity is the first number you should lock down when buying any food processing line. Whether you are looking at a frying line, a dryer, a retort or a vacuum packer, the required throughput in kg/h (or TPD — tonnes per day) decides machine size, footprint, utility load and price long before brand or features do.
Read the nameplate correctly
Capacities are quoted two ways. kg/h (kilograms per hour) describes a continuous machine’s steady output. TPD (tonnes per day) usually describes a line rated over a shift pattern, often 20–24 operating hours. A 100 TPD french fries line and a 1000 kg/h french frying line sound different but describe overlapping scales once you normalize the shift length — always convert to the same unit before comparing quotes.
Size for peak load, not average
Your real constraint is the busiest hour of your busiest day, not the daily average. A common rule of thumb is to size the headline machine for 20–30% above your stated peak throughput, so short surges, slightly wetter raw material or a missed cleaning window do not starve the line. Undersizing here is the most expensive mistake in a line, because every other station is then waiting on it.
Match every station, or the line bottlenecks
A line is only as fast as its slowest station. Sketch the flow and write each station’s capacity next to it:
| Station | Example capacity | If it is the slowest… |
|---|---|---|
| Washing / pre-treatment | kg/h of incoming product | Raw material queues upstream |
| Cutting / slicing | kg/h of cut pieces | Uneven feed to cooker |
| Core process (fry / dry / retort) | kg/h finished or per batch | Whole line waits |
| Packing | packs/h | Finished goods pile up |
The fix is rarely to over-buy the core machine; it is to bring the adjacent stations up to the same number. For fryers specifically, our fryer sizing guide walks through the same math with frying examples.
Capacity scales the support systems too
Doubling throughput rarely doubles the price — it also grows the boiler, compressor, electrical supply, floor space and labor. When a supplier quotes a bigger model, ask what changes in utilities and footprint, not just the machine tag. A large-scale freeze dryer (500–2000L) and a small batch dryer are different not just in drum size but in the plant around them.
Frequently asked questions
Should I size by kg/h or by TPD? Use whichever the supplier quotes, but convert everything to one unit before comparing. kg/h describes steady continuous output; TPD usually assumes a fixed number of operating hours per day, so a 100 TPD line and a 4000 kg/h line may be similar once normalized.
How much buffer above peak throughput should I plan? A 20–30% buffer above your stated peak is a common starting point, so short surges and variable raw-material condition do not bottleneck the line.
Why does my packing station often become the bottleneck? Packing is usually manual or semi-automatic and easy to under-specify. If it runs slower than the core process, finished product accumulates and the whole line effectively slows to the packer’s rate.
Get a configuration that fits your line
These comparisons are starting points. Send us your product, target hourly throughput and package type, and we will point you to the right machine and a matching auxiliary layout. Request a quote or browse the full range under each product category.