Technical article
How to Calculate Packaging Machine Capacity
The capacity a packaging line needs is a calculation from the plant's own numbers, not a figure from a brochure. Done properly, it also shows where a line will lose that capacity.
Step 1: Daily Output in Packs
Divide the product to be packed per day by the pack weight. Packing 6,000 kg a day into 500 g bags means 12,000 bags a day. For count-based packs, divide pieces by pieces per pack.
Step 2: Minutes the Line Really Runs
Start from the shift length and subtract breaks, start-up, cleaning and planned changeovers. Two 8-hour shifts with 45 minutes of breaks, start-up and cleaning each leave 870 planned running minutes.
Step 3: Allow for Availability
No line runs all of its planned minutes. Film changes, stops at upstream machines, jams and short waits for product all take time. If the plant's own experience says the line runs 85% of its planned time, the effective running time is 870 × 0.85 ≈ 740 minutes.
Step 4: Required Packs per Minute
Divide daily packs by effective running minutes: 12,000 ÷ 740 ≈ 16.2 bags per minute. That is the rate the line must sustain — the machine's rated speed for this product and pack must be above it, with a margin for peaks.
The figures in this example illustrate the arithmetic; they are not the rating of any particular machine. Use your own output, pack weight, shifts and availability.
Step 5: Check Every Stage, Not Only the Packer
A line runs at the speed of its slowest stage. Check the same rate against:
- Product supply from processing, and any buffer before the weigher
- The weigher or filler at the target weight
- The packer's sealing time for the chosen film
- Checkweigher, metal detector and labelling
- Case packing and palletizing
Step 6: What Moves the Real Figure
Pack size and fill volume, how fast the product flows, the film's sealing time, gas flushing, the dosing method and product changeovers all change the achievable rate. That is why a supplier should confirm capacity for your product, pack and film rather than quote a generic maximum.
Next step
Evaluate the process on your product.
The correct automation decision depends on your product, line layout and target process.