How to Reduce Overfill in Aluminum Can Filling Machines

Views: 3169 Author: Howie SUN Publish Time:
A can line is rated in cans per hour because the seamer sets the pace, and the seam, not the filler, is where the rating is usually lost.
Key facts at a glance
Filling principleIsobaric for beer and CSD, volumetric for juice and tea
Rated outputUp to 25,000 CPH
Can rangeStandard 250, 330 and 500 ml
SeamingRoller seamer integrated with the filler
OptionsHot fill for juice and tea, nitrogen dosing
Key controlFill level, seam tightness, dissolved oxygen

What changes between a beer can and a juice can?

Beer and CSD run isobaric, cold, under counter-pressure. Juice and tea often run hot fill or a volumetric fill with a downstream pasteuriser. The can is the same format; the filler, the valve set and the temperature control are not, so one can line rarely covers both without a second specification.

What does a can line cost to run that buyers forget?

Compressed air for the seamer and the air conveyor, CO2 for purging, and the tear-down cans used for seam checks every shift. None of these appear in the machine price. A line running 24,000 CPH can consume a measurable share of its operating cost in air alone.

ProductFilling principleCritical measurement
BeerIsobaric, coldDissolved oxygen and seam tightness
CSD and sodaIsobaric, coldCO2 retention and fill height
Juice and teaVolumetric or hot fillFill temperature and seam integrity
Energy drinksIsobaric or volumetricDissolved oxygen and closure

The Aluminum Can Filling Machine for Beer, Carbonated Soft Drink is the matching unit when this becomes a line project.

What does a hot-fill can line need that a cold line does not?

A heated product path, a fill temperature control loop and a cooling tunnel after seaming. The can itself tolerates the heat; the lining and the product do not always. The temperature window belongs to the product specification.

Rated output, change parts and services are listed on the Aluminum Can Filling Machine for Hotfill Juice and Tea page.

Why is can handling gentler than bottle handling?

Cans are light and rigid, so they move on air conveyors and mass conveyors with low back pressure. Dents come from jams and from accumulation pressure, not from the filler. A can line that dents is a conveyor setting problem before it is a machine problem.

The same question is worked through from another angle in How Nitrogen Dosers Enhance Beer Quality in Cans.

How to read the numbers. The capacity tab on the specification sheet gives ranges; treat them as such. Can lines lose more to seamer stops and conveyor accumulation than to filler speed. Plan on a factor of 0.65-0.85.

Frequently asked questions

How many cans per minute is 18,000 CPH?

300 cans per minute. Divide CPH by 60. The seamer, the filler and the packer all have to carry that number, so the line rating is the lowest of the three.

What is dissolved oxygen and why does it matter?

It is the oxygen left in the product after filling. It drives oxidation, off-flavour and haze. Beer and juice have tight limits, and the measurement belongs in the acceptance protocol, taken from the finished can.

Why do cans dent on the conveyor?

Usually conveyor pressure or a jam at a transfer, not the can quality. Air conveyor pressure, guide rail gaps and accumulation length are the three settings to check first.

Does a 250 ml can run faster than a 500 ml can?

Yes, at the same filler, because the fill volume per cycle is smaller. The seamer and the packer still have to carry the higher can rate, which is why the line rating is set on cans per hour, not litres.

Key takeaways
  1. CPH and BPH are different units; never compare them directly.
  2. Dissolved oxygen in the finished can is the number that decides shelf life.
  3. Beer and juice cans share a format, not a filling specification.
  4. A failed seam is a roll and flange problem, found by measurement.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
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