Aluminum Can Filling Machine Selection Guide — Capacity, Can Size and Valve Type

1. Why cans are different

A can line is a filler followed by a seamer. There is no blow moulder, because the can is made elsewhere, and no capper, because a can is closed by a double seam rather than a closure. The rigid can changes the handling problem completely: there is no breakage to design against, the can rides on its base through the line, and seaming is fast enough that throughput is set by the filler and seamer, not by gentle handling.

Selection turns on output, can diameter and height, and the product — exactly the same axes as glass, but with a seamer instead of a capper and with much higher rated speed. The closure question becomes a seam question: which end diameter and which seam specification, and whether the seamer is paced to the filler at your target rate.

Against PET, cans score on protection and convenience: the aluminium barrier blocks light and oxygen completely, stacks and ships densely, and chills quickly. The trade is a per-can package cost and a line built around seaming rather than blowing or capping. For beer and CSD the can is often the preferred retail format, which is why can lines are specified for throughput first and format flexibility second.

For a buyer new to cans, the fastest way to scope is to fix the product and the can first, then let output set the valve and seamer counts. The rest of this guide works through that order so the configuration follows the product rather than the other way around, and the comparison with a PET combiblock stays a format choice rather than a like-for-like race the can was never going to win on lightweighting.

2. Capacidad y producción

Can lines run in CPH (cans per hour) rather than BPH, and the top end is high. Standard 330 ml beer and CSD lines reach roughly 18,000 to 36,000 CPH; larger or irregular cans run slower because the valve dwell and the seaming cycle take longer. As an indicative rule, an isobaric valve delivers on the order of 1,000–1,500 cans per hour at 330 ml, so 36,000 CPH needs around 24–36 valves paired with a seamer of matching head count.

Output is the joint product of filler valve count and seamer head count. The seamer must close every can the filler produces, so the two are specified together; quoting a filler speed without a matched seamer is not a line speed. Confirm both numbers on your can drawing, not on a generic rating.

The CPH unit is worth keeping straight. Cans are counted per can, and a can line's rated speed is quoted in CPH while PET and glass lines are quoted in BPH. A 36,000 CPH can line and a 36,000 BPH PET line are not the same drink volume per hour for a 330 ml can versus a half-litre bottle, so compare on drink volume when the lines feed different retail formats, not on the raw count.

Rated speed and sustained speed are not the same number. A line rated at 36,000 CPH on a named can at a named fill may sustain less once changeovers, seam checks and CIP are counted in. Ask for sustained output on your main can including a realistic changeover allowance, because that is the figure your capacity plan should use, not the brochure rating.

3. Valve type follows the product

The product decides the filling principle, as everywhere else. Carbonated drinks and beer need isobaric counter-pressure valves; juice and tea use hot-fill valves at 85–88 °C; still water and still drinks use volumetric or gravity valves. The accuracy ladder is the same: mechanical lowest, volumetric or load cell highest, with isobaric and hot-fill as product-specific requirements.

La decisión sobre la válvula en el contexto del bloque combinado se encuentra en Tipos de válvulas de llenado combiblocky las bandas de capacidad por producto están en Selección de capacidad del bloque combinado.

Accuracy matters slightly less for cans than for PET, because can volume is consistent can to can — there is no preform or blow variation to track. Level filling therefore holds volume well on cans, and measured dosing is specified when the declared quantity is tight or the product is high-value, not as a default. The valve choice is still driven by carbonation and temperature, not by accuracy concerns.

4. Can size, end and seam

Can diameter sets the valve pitch on the filler and the seamer head pitch; height sets the guarding and the infeed timing. Standard diameters (for example 202 and 211 bodies with 200 or 202 ends) share a pitch band, while a slim or a wide can changes the count that fits a given turret. Height affects the star-wheel timing and the seamer tooling more than the filler.

The internal coating matters for product compatibility — an acidic juice needs a coating the can supplier specifies, and that choice reaches the line as a can specification rather than a machine setting. State the product at quotation so the can and the seam are specified for it.

Slim and sleek cans reuse the same body diameter with a different height and wall profile, so they often need no pitch change, only infeed and seamer timing changes. A wider or taller specialty can is a different matter and may need a lower valve count at the same turret. Confirm the full can list, including sleek variants, so the line is specified for the family you will actually run.

5. Seaming and CO₂ management

After filling, the can passes to the seamer where a double seam closes the end to the body. The seam is a food-safety barrier, so seam setup and verification are part of commissioning and of routine production checks, not a one-time adjustment. The seamer head count is matched to the filler so no can waits.

For carbonated product, CO₂ management runs through the whole machine. The isobaric valve uses CO₂ to counter-pressure the can; displaced gas is recovered to the tank rather than vented; and the seam must hold pressure through distribution. A line specified without CO₂ recovery wastes gas and loses product; a line specified with it pays back in run cost.

Hot-fill cans follow the same seam logic but with a snift after cooling to pull a partial vacuum, and the can and end must tolerate the temperature. The seam verification step is the same; only the thermal spec on the package differs.

Seam failure shows as leakers, which are a food-safety and brand event, not a cosmetic one. The defence is seam setup at commissioning plus routine teardown checks and roll inspection, built into the production routine rather than reserved for complaints. Specify seam verification with the line so the check is part of normal operation, not a reaction.

CO₂ recovery is worth naming separately because it changes run economics on every carbonated run. An isobaric filler displaces gas from the can as it fills; recovered gas returns to the tank instead of venting, and the saving in gas and in product loss is measurable on a high-volume CSD line. Specify recovery with the line rather than as an afterthought, because retrofitting it is rarely clean.

6. Elección de la configuración

Cinco entradas definen la mayor parte de la especificación:

1. Product and fill temperature. Still, carbonated or hot-fill sets the valve family outright.
2. Can drawing. Diameter, height, end diameter and coating set the filler, seamer and seam.
3. Target output at your main can. This sets valve count and seamer head count together.
4. Seam specification. End diameter and double-seam spec set the seamer tooling.
5. Alcance. Filler, seamer, CIP, CO₂ recovery, labeller, packer and palletiser.

Once the valve family and the can are fixed, the remaining choices are configuration tier and automation, compared in aluminum can machine configurations and price levelsLas preguntas que más hacen los compradores se recopilan en the aluminum can filling FAQ.

When weighing a can line against a PET combiblock for the same drink, the can line wins on product protection and retail format for beer and CSD, while the combiblock wins on bottle lightweighting and caps-per-bottle cost for water. The two are not competitors so much as format choices; many producers run both, and the can line is specified on its own CPH and seam basis regardless of the PET decision.

Where cans are one format among several, the filler range is in aluminium can filling machinesy las líneas completas están delimitadas en the beer production line solution y the carbonated drinks line solution.

For a plant that also runs PET or glass, the can line is a separate filling principle with its own seamer, so plan the hall so the three do not compete for the same utilities and pack area. The filler range across formats is in the filling machine range, and the can line sits alongside the PET and glass options rather than replacing them.

Preguntas frecuentes