Packaging Machine Types: What Each Machine Does

A buyer who asks for a “pouch machine” or a “case packer” often finds that suppliers use the same word for quite different equipment. Product people, engineers and purchasing staff also group machines differently, so early conversations go slowly.

Sorting machines by the job they do along the line, from product arrival to the pallet leaving, clears up most of this. Each step below lists the common machine types, the products and packs they usually handle, and the first question worth asking a supplier. The guide also covers when a combined machine makes sense and why one product can often be packed in more than one way.

How a packaging line is organized

Packaging lines are usually described in three levels. Primary packaging is the pack that touches the product, such as a pouch, bottle, tray or wrapper. Secondary packaging groups primary packs, for example a carton holding several pouches or a multipack film around cans. Tertiary packaging, also called end of line, protects goods in storage and transport: shipping cases, pallets and stretch wrap.

Figure 1 shows these three bands and the machine types that usually sit in each. Read it as a map, not a layout. A real line may skip a band, repeat one, or place a step in a different order.

Each machine on the map has one main task, and most buying mistakes come from mixing up tasks. A filler puts product into a container but does not make the container. A form-fill-seal machine makes the pack and fills it, so it covers two or three tasks at once. A checkweigher confirms weight but does not correct the filling. Keeping the task separate from the machine name shows what a quote actually includes.

What each machine does

The sections below follow the order of the line. The comparison guides linked in each section go further into the choices within one step.

Product infeed and preparation

Product has to reach the packaging machine in a form it can accept. For loose products that means feeders, elevators, vibratory conveyors or buffer hoppers. For discrete items such as bars, bottles or cartons it means orienting, spacing and sometimes grouping them. This step gets little attention and causes many stoppages, because the packaging machine can only run at the rate and consistency of what reaches it.

Dosing and filling

Dosing machines control how much product goes into each pack. Four families cover most requests.

• Auger fillers meter powders and some granular products by volume, using screw revolutions.
• Multihead weighers weigh several portions in separate hoppers and pick the combination of hopper contents closest to the target weight. They are common for snacks, confectionery, frozen items and other free-flowing or irregular pieces.
• Piston fillers draw in and discharge a set volume per stroke and suit many liquids, creams and pastes.
• Pump fillers use gear, lobe, peristaltic or other pumps, with fill volume set by revolutions, a flow meter or time.

Two of these choices have their own guides: auger fillers compared with multihead weighers and piston fillers compared with pump fillers.

Forming and sealing

This step creates or closes the pack. The main types are:

• Vertical form-fill-seal (VFFS) machines pull film from a roll, shape it into a tube around a forming shoulder, seal it and fill it from above. The result is typically a pillow or gusseted bag.
• Premade pouch machines take empty, finished pouches from a magazine, open them, fill them and seal the top. Stand-up and zipper pouches are typical.
• Flow wrappers form a tube of film around a product moving horizontally, then seal a fin along the back and crimp the ends. Flow wrapping and overwrapping differ in structure and materials.
• Thermoform machines heat a film web, form a cavity, fill it and seal a lidding film over it.
• Other options include sachet and stick pack machines, bottle capping and sealing lines, and tube fillers. VFFS compared with premade pouch machines covers the choice between pouch routes, and stick packs compared with sachets covers single-serve formats.

Coding and inspection

Coders print or mark dates, lot codes and sometimes barcodes. Inspection equipment checks the result. Checkweighers verify package weight, metal detectors look for metal contaminants, and vision systems check labels, codes, closures or fill level. Each check needs a reject mechanism and a way to confirm that rejected packs really leave the line. Checkweighers compared with metal detectors explains the difference between two common inspection tasks.

Secondary packaging

Cartoners erect or take cartons, load primary packs into them and close them. Multipackers group packs under film or in trays. Overwrappers apply a folded outer film. Which of these appears depends on the retail format, the shelf or e-commerce requirement and what regulations or customers expect in the target market.

Tertiary and end of line

Case packers load packs or cartons into shipping cases by top-load, side-load, wrap-around or robotic pick-and-place methods. Case sealers close the case with tape or adhesive. Palletizers stack cases into a load pattern, and stretch wrappers secure the pallet. Cartoners compared with case packers covers the difference between cartoning and case packing.

Process steps, machine types and first questions

The table collects the sections above in one place. The final column is the question that most often changes the scope of a quote, not a complete specification.

Process step	Machine types	Typical product/pack formats	First question for the buyer
Product infeed and preparation	Feeders, elevators, vibratory or belt conveyors, buffer hoppers, orienting and spacing devices	Loose bulk product, discrete items, bottles, cartons	In what form and at what rate does product arrive, and what happens when upstream stops?
Dosing and filling	Auger filler, multihead weigher, piston filler, pump filler, linear or combination weigher	Powders, granules, snacks, liquids, creams, pastes	Is the product dosed by volume or by weight, and how consistent is its bulk density or viscosity?
Forming and sealing	VFFS, premade pouch machine, flow wrapper, thermoform fill-seal, sachet and stick pack machine	Pillow bags, gusseted bags, stand-up pouches, trays, stick packs, sachets	Which pack styles must run today, and which might be added later?
Coding and inspection	Inkjet, thermal transfer or laser coder; checkweigher; metal detector; vision system	Printed dates and lot codes, weight checks, contaminant checks, label and seal checks	Which checks are required by customers, regulations or internal risk analysis, and what happens to a rejected pack?
Secondary packaging	Cartoner, multipacker, overwrapper, tray packer	Cartons, multipacks, trays, overwrapped boxes	What retail or club format is needed, and how does the primary pack arrive at the cartoner?
Tertiary and end of line	Case packer, case sealer, palletizer, stretch wrapper	Shipping cases, trays, full pallets	What case sizes, pallet patterns and customer pallet rules apply?

Combined machines or separate machines

Some machines cover several steps. A VFFS machine forms, fills and seals. A thermoform fill-seal machine does the same for trays. Some systems also include the dosing unit, a coder and a reject station. Separate machines connected by conveyors give the same sequence with more flexibility.

Combined machines usually suit situations where:

• the pack format is stable and the product is well matched to the machine’s fill method;
• floor space is limited;
• one supplier can take responsibility for the combined result, including how the dosing and forming steps interact.

Separate machines usually suit situations where:

• several products or pack formats must share part of the line;
• one step is likely to be replaced or upgraded before the others;
• the plant wants to buffer between steps so a stop at one machine does not stop everything.

A combined machine has fewer interfaces to engineer, but a fault in one section may stop the whole unit. A line of separate machines has more interfaces but allows buffering, bypassing and staged investment. The line integration checklist covers those interfaces in detail.

One product, several routes

A buyer who asks for “a machine for granola” will usually hear more than one proposal. Dry snack products can go into a pillow bag from a VFFS machine, a stand-up pouch from a premade pouch machine, a carton from a cartoner, or a tub or tray on a different line. Each route differs in cost structure, pack appearance, speed, material supply and changeover effort.

So the first step in specifying equipment is to describe the product and the sales requirement, not the machine. Useful starting points are:

• the product’s physical form, flow behavior, fragility and any dust or stickiness;
• the target pack style and the retail or customer requirement behind it;
• the pack size range and how many formats must run;
• the output required per shift, and the unit it is expressed in (packs per minute, kilograms per hour, cases per day);
• the shelf life and barrier requirements that affect film or container choice.

With that information, two or three candidate routes can be compared on the same basis. The RFQ checklist lists what to put in the request so that suppliers quote against the same description.

Questions to ask suppliers

Whatever the machine type, a supplier should be able to answer or provide the following, and the answers are worth comparing across quotes.

• Which steps the machine performs and which it expects from upstream or downstream equipment.
• The rated speed in the same unit you will use to plan production, and the product, pack size and conditions to which that rating applies.
• The pack formats the machine can run, and which parts or settings change between them.
• What product, film or container samples the supplier needs to confirm the machine suits your product, and whether they offer trials.
• The utilities and interfaces required: power, compressed air, water, vacuum, signals and communication.
• How the machine behaves when upstream product stops or downstream is blocked, and how it reports that to the line control. Industry guidance such as PackML is often used for machine states and tags, so ask whether and how the machine supports it.
• The safeguarding approach, applicable safety standards for the target market, and the documentation that comes with the machine.
• Cleaning access and, where relevant, hygienic design and washdown rating.
• Recommended spares and expected consumables, such as sealing elements, knives and filters.

Pre-quote checklist

Use this list to check that the information going to suppliers is complete enough to be comparable.

• The product is described by physical form, flow behavior and any hazards, with samples available.
• The target pack styles and sizes are listed, with drawings or sample packs.
• The required output is stated with its unit, shift pattern and expected efficiency.
• The steps expected from each supplier are listed, including inspection and coding.
• Upstream and downstream equipment is identified, with interface details and heights.
• Available floor space, utilities and ceiling height are noted.
• Packaging materials are identified, with specification sheets or sample reels or pouches.
• Regulatory and customer requirements for the target market are known.
• Future formats or products that the machine should handle are listed separately from today’s needs.

Limits and on-site verification

This guide describes machine families in general terms. It cannot say which type suits a specific product, because that depends on product behavior, packaging material, required output and plant conditions. Machines within one type also differ widely in design, so the machine manual and the supplier’s specification are the reference for what a given model can do.

Check claims about speed, accuracy and format range with your real product and packaging material on the actual machine, either in a trial at the supplier’s site or during acceptance on your own. Relevant safety references include the general requirements for packaging machines in the EU and in the United States; which ones apply depends on the market and the product. Where a purchase has safety or regulatory implications, the safeguarding design needs a risk assessment following the method in ISO 12100 and review by qualified personnel. Cleaning, adjustment and maintenance belong to trained staff working under the plant’s own procedures, including energy isolation, which are outside the scope of this guide.

Related decisions

If your product could go into either a roll-stock bag or a premade pouch, continue with the VFFS and premade pouch comparison. If the packs are already formed and the question is how to carton and case them, go to cartoners and case packers. To turn a machine choice into a request that suppliers can answer, use the RFQ checklist.