How to Choose a Filling Machine

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Start with a written product and packaging brief

Choosing the wrong pack format or supply boundary produces quotations for different jobs. Work in this order: product, pack, dose, accepted output, then equipment scope. Start with the product and package you need at launch, and mark later formats separately so the first proposal can be compared against a defined brief.

Your brief should cover the product name, fill temperature, target amount, a package drawing, the output you need and where it's shipping. Add photos of the current pack and a short video of how the material pours, and say whether artwork, film and dimensions are locked in. If not, ask the equipment team which decisions need to be frozen before tooling gets designed.

One point from a Packaging World video on choosing liquid filling equipment: viscosity, fill accuracy, cleaning requirements and container type all affect each other. The right dosing principle is only part of a workable packaging process.

Step 1 — describe how the material behaves right before it's dosed

The product name alone doesn't tell us how it will fill. For a sauce, tell us whether it has seeds, fibers or pieces, whether it separates when it sits, and whether it thickens as it cools. For a beverage, mention any foaming you see during transfer. What matters is how the material behaves at the filling head, not how it behaves once it's sitting on a shelf.

For powders, we need to know how it flows, how dusty it is, its bulk density, and whether it compacts in storage. For granules and dry foods, describe particle size, stickiness, fragility and whether ingredients are mixed together. Review piston, auger or weighing approaches against those product observations before choosing the dosing arrangement. Before locking in a dosing setup, ask for a trial run with your actual material.

Use the liquid filling family for flowing products, the paste filling family for cutoff and particle questions, the powder filling family for blend feeding, and the granule filling family for piece transfer and weighing.

Step 2 — pick the pack format before you plan the machine layout

Premade pouches and film-formed packs enter the machine in different ways, so this decision comes before machine layout, not after. A premade-pouch system takes a bag that already has its shape and needs to open, fill and seal it; a film-based system forms the package from a roll during the run. Multi-lane stick-pack equipment makes several narrow packs side by side, and a dosing-cap system fills a cavity built into a closure.

Get us a dimensioned drawing showing the fill opening, seal areas, overall size, and any zipper, spout, notch or special contour. For film, send the material construction and the converter's recommended sealing settings. Include the smallest and largest packs you plan to run, not just ones you might someday want. What matters is which parts need to change, how long that takes, and whether each format has been checked against its own product and packaging.

Step 3 — specify the dose and the measurements that matter

Tell us the target quantity, its unit, and how you'll actually check the finished pack. A volumetric dosing setting and a net weight result aren't the same thing. If your product is sold in millilitres but checked on a balance, agree upfront on how temperature, density and package tare get handled. Ask the supplier to spell out the measurement basis in the proposal, rather than quoting an accuracy percentage alone.

Spell out what you need checked on fill amount, pack appearance, seal condition and coding, separately. On a powder stick pack, a dead-on dose with a contaminated seal is still a reject. On a sauce sachet, what matters is drips, residue on the seal, or a pack that looks wrong on the shelf. On a cap cavity filler, look at how the ingredient reaches the cavity and whether the sealing rim stays clean enough for the foil to bond. Ask upfront which checks happen during a demo.

Step 4 — compare real output, not the biggest number on the spec sheet

Ask for output in finished packs per minute or per shift, the number you can use, not a cycle rate. A machine's cycle speed, one lane's output and a full line's total discharge are different numbers. For multi-lane equipment, ask how many lanes are running and whether the quoted rate includes your agreed dose and pack length. For a full line, find the slowest step, inspection and downstream handling included, since that's the limiting number.

Here's a hypothetical: a four-lane system running at 25 cycles per minute works out to 100 packs per minute on paper, before rejects or stoppages. That math describes a machine's ceiling, not what it will actually deliver. If the station right after it can only take 80 packs per minute, you either slow the filler to match or agree on how packs accumulate in between. Also ask how refilling the hopper, cleaning and changing formats eat into the schedule.

Step 5 — check how the machine will be fed, cleaned and changed over

Tell us how product gets to the machine today, how much transfer height you have to work with, and whether it arrives continuously or in batches. Say who's supplying any hopper, pump, conveyor or powder feeder, and how its controls talk to the packaging machine. A filling unit can be exactly right for the product and still be a pain to run if nobody's worked out how it gets refilled.

Put together a changeover list: which product-contact parts, forming tools, nozzles, settings and packaging materials need to change. Ask to see the cleaning access and the sequence for pulling parts off and putting them back. Keep the mechanical format change separate from cleaning, drying, inspection and sign-off for the next product. If ingredients need to stay separate from each other, your production and quality teams should set the cleaning requirements. A quick-release part makes access easier, but doesn't prove your cleaning process works.

Define what's actually included in the equipment scope

Step 6: Map the process from incoming product and empty packaging to finished goods in your hands. Mark out dosing, pack handling, filling, sealing, coding, inspection and discharge, then add any wrapping, cartoning or case handling the project needs. A photo of a connected line running somewhere else doesn't tell you which of those steps are actually in your quotation.

Ask for an itemized equipment list and a drawing showing the interfaces between machines. Settle who's responsible for mechanical transfers, electrical connections, control signals and guarding at each boundary. If you're keeping any existing equipment, give its dimensions and operating rate to whoever is quoting. One quote might cover the whole process; another might cover just the core packaging machine. Both can be reasonable, as long as you know exactly where each one's responsibility ends.

Check the factory layout and operating access

Measure your installation area: the entrance route, the ceiling height, and the space you need around the machine to actually run it. Account for the operator position, the film loading area, access to the control cabinet, and a clear path to pull parts for maintenance. Work out where product and packaging will stage, where finished packs will collect, and how people move through the space during a normal shift. A spec sheet's footprint won't answer that.

Give us your power and compressed air numbers, then ask what your configuration actually needs. If a vacuum, extraction or temperature-control module is part of the proposal, its utilities and maintenance access belong in the layout too. Settle downstream equipment at this stage, before the filler arrives, not after. The goal by the end is one installation drawing everyone has signed off on, with connection points and responsibilities spelled out.

Use sample testing to settle the real unknowns

Go into a sample review with a written goal. Maybe you need to know whether powder feeds consistently, whether sauce passes cleanly through a valve, or whether the product gets damaged in a drop. Maybe it's how the seal looks with a particular film. Settle beforehand what product and packaging you'll send, what the team will watch for, and what gets measured, and confirm the quantity and shipping instructions.

When the results come back, check that the product, pack, dose and equipment setup match what you asked for in the brief. Hang on to the raw numbers too, not just the summary. If the test ran on substitute material or a different pack than you'll actually use, note the difference and flag what still needs checking on the real thing. A useful test ends with an actual decision: accept the approach, change a module, adjust the pack, or run it again, not a vague "looks good."

Turn your decisions into one proposal you can review

Before you commit to a purchase, get every decision into one configuration document. It should cover the products and formats you're running, the agreed operating conditions, the equipment list, tooling, utilities, inspection plan, training and who's delivering what. Ask for drawings and documentation for your configuration, not a generic one. If something changes later that touches the product, pack or output target, check its effect on the machine.

You don't need a finished engineering spec to start. Send the basics: what the product is, your target dose, a drawing or photo of the pack, the output you need and the destination. We'll use that to work out which family fits: pouch, sachet, powder, weighing or a specialized filling setup. If you've worked through product, pack, dose and scope as this guide describes, the first conversation can move straight to configuration questions.

Copy the table below into your project notes. Fill the right column from your own documents and mark unresolved decisions as undecided. The example document types in What to send us describe submission formats only.

When this selection brief does not settle the choice

This is a way to organize a configuration discussion, not an approval of every material or format in a family. Unresolved flow, seal or transfer behavior belongs in the agreed sample review; machine acceptance uses the written configuration. Changes to the product, pack or scope reopen the affected decision. Workshop photographs and schematic examples do not establish model specifications.

Common questions