Secondary packaging is often where a packaging line either settles into consistent output or starts losing time. Products may leave the primary pack in good order, but if collation, grouping, cartoning, case packing or wrapping are not matched to the product and line speed, efficiency quickly drops. This guide to secondary packaging equipment focuses on how these machines are used in real production environments, what they need to handle well, and where specification decisions make the biggest difference.
What secondary packaging equipment needs to do
Secondary packaging sits between the primary pack and the final distribution stage. Its job is to group, protect and present products for storage, transport, retail handling or onward palletising. That can mean placing flow wrapped items into cartons, loading pouches into cases, shrink wrapping multipacks, or organising trays for easier handling further down the line.
In practical terms, the equipment must do three things reliably. It needs to receive products from upstream machinery at a controlled rate, form the required secondary pack without damaging the product or primary seal, and pass packs downstream in a stable, repeatable format. Problems usually appear when one of those three areas has been treated as secondary in the planning process.
The right machine is not simply the one that matches a target packs-per-minute figure. It also needs to suit product orientation, pack pattern, available footprint, operator access, changeover frequency and the level of automation already used on the line.
A guide to secondary packaging equipment by machine type
Cartoning systems
Cartoners are used where products need to be enclosed in a retail-ready or shelf-ready carton. In food, pharmaceutical and consumer goods production, they are often selected to improve pack presentation, protect individual items and support coding or traceability requirements.
The key distinction is usually between horizontal and vertical cartoning, although the more important question is how the product needs to be loaded. A biscuit stack, for example, behaves very differently from a sachet, tray or medical device. Product handling and infeed design matter as much as carton size range.
For lines with multiple stock keeping units, carton size changeover should be assessed carefully. A machine with broad flexibility can reduce the need for separate equipment, but that flexibility may come with a slower optimum speed or more manual adjustment points. That trade-off is not always a problem, but it should be understood early.
Case packing equipment
Case packers place primary or secondary packed products into transit cases. They are widely used in food production, household goods, contract packing and e-commerce fulfilment, where consistent case loading improves downstream handling and pallet stability.
Top-load and side-load case packers suit different applications. Top-load systems are often preferred where products need gentle placement into regular slotted cases or trays. Side-load systems can work well for cartons or rigid packs moving in a stable orientation. The decision depends on pack format, collation method and line layout rather than a simple preference for one style over another.
Case packing is also one of the clearest examples of where upstream consistency affects machinery performance. If products arrive poorly spaced or unstable, the case packer has to compensate. Sometimes that means adding indexing, buffering or collation before loading rather than increasing machine complexity at the loading point itself.
Shrink wrapping and bundling systems
Shrink wrappers are commonly used for collating products into multipacks or transport bundles. Bottles, cans, cartons, trays and other grouped items can be wrapped in film with or without a supporting tray, depending on the handling demands of the product.
These systems are often chosen for material efficiency and pack stability, but they need careful matching to the product. Heat sensitivity, pack geometry and required pack presentation all influence machine design. A high-output beverage application and a lower-speed food line may both use shrink wrapping, but the infeed control, film handling and tunnel settings will differ significantly.
Where products are lightweight or prone to movement, pack control through the sealing and shrinking stages becomes critical. Film choice also matters. Thinner film may reduce material use, but if it compromises pack integrity during transport, the overall result is not an improvement.
Tray packing and collation systems
Tray packing equipment groups products into a defined format, often for retail display, transport protection or easier handling in warehouse operations. Depending on the application, products may be loaded into formed trays, onto flat blanks, or collated ready for a later wrapping or lidding step.
The important point here is pattern control. Irregular grouping leads to unstable trays, poor presentation and stoppages downstream. For operations handling mixed formats or frequent seasonal changes, the tray packing system should allow format variation without excessive downtime.
Wrap-around case and tray formers
Wrap-around systems form a case or tray directly around the grouped product, rather than loading into a pre-formed case. This can improve pack compactness and reduce board usage in some applications. It is commonly used where line speed is high and product dimensions are consistent.
However, wrap-around equipment generally depends on good infeed discipline. If product spacing or orientation varies too much, board forming and closing accuracy can suffer. It suits stable, repeatable products particularly well, but may be less forgiving where pack quality from upstream equipment is inconsistent.
Integration matters more than machine choice alone
A good guide to secondary packaging equipment needs to look beyond individual machines. Secondary packaging rarely works as an isolated process. It depends on the upstream flow wrapper, VFFS machine, tray sealer or filling system, and it sets the pace for palletising, warehousing and dispatch.
This is why line integration is often the difference between acceptable performance and repeatable performance. Product transfer, buffering, rejection handling, guarding, controls architecture and conveyor design all affect how the line behaves over a full shift. A machine can run well in a demonstration and still underperform if the handover points on either side are poorly managed.
For example, a case packer may be specified correctly on speed, but if there is no accumulation before the machine, minor stoppages upstream can starve it continuously. Equally, if no allowance is made for rejected or out-of-spec packs, operators may need to intervene too often, slowing the entire line.
Selection factors that change the right answer
Product characteristics
Product shape, weight, rigidity and surface condition all influence equipment choice. A rigid carton is easier to collate than a soft pouch. A tightly sealed tray behaves differently from a flexible flow wrap pack. Fragile or freshly sealed products often need gentler transfer and more stable handling through the secondary stage.
Required throughput
Throughput should be considered in relation to actual production conditions, not just theoretical peak speed. Shift patterns, planned downtime, changeovers and product mix all affect what the equipment needs to deliver. In some cases, a slightly slower but more forgiving system produces better overall output than a machine optimised for maximum speed.
Format range and changeover
Operations with one stable product format can usually optimise for efficiency and simplicity. Sites handling multiple sizes or frequent retail changes need quicker adjustment and clearer set-up control. Tool-less change parts, recipe storage and guided adjustment can reduce operator dependency, but only if the machine has been designed around realistic production variation.
Space and access
Factory footprint is a practical constraint in many UK production facilities. It is not only the machine footprint that matters, but also access for loading consumables, cleaning, maintenance and safe operator movement. Compact equipment can help, but not if it creates poor access or difficult service conditions.
Materials and pack specification
Board grade, film type, case style and pack count all affect machinery performance. If secondary packaging materials vary between suppliers, tolerance handling becomes important. Equipment should be specified around the actual material standard the site expects to run, rather than an ideal sample.
Where automation adds value
Automation in secondary packaging is usually justified by consistency, labour reduction and output stability, but the value depends on the application. A manual end-of-line process may be workable at low volumes or with highly variable packs. As throughput increases, manual collation and packing often become the bottleneck.
That said, full automation is not always the immediate answer. Semi-automatic systems can be the better step where product range is broad or floor space is limited. The sensible approach is to identify where labour input is highest, where errors occur most often, and where line stoppages originate. That often shows whether the priority is automatic loading, case forming, sealing, product collation or a more complete secondary packaging cell.
For manufacturers planning broader line development, secondary equipment should also be assessed for future integration with robotic loading, pallet wrapping or robotic palletising. Pac-right’s approach in these situations is typically to look at line behaviour as a whole rather than treat each machine as a separate purchase.
Common specification mistakes
One common mistake is treating all packed products as stable because the primary pack looks finished. A pouch that is sealed is not necessarily easy to collate. A wrapped product is not automatically rigid enough for high-speed case loading.
Another is underestimating changeover time. If a line switches formats several times per week, changeover design has a direct effect on available production time. It should not be treated as a minor detail.
The third is overlooking how operators interact with the machine. Clear access, fault visibility and straightforward adjustments are not optional extras. They affect uptime every day.
Secondary packaging equipment works best when it is specified around the real product, real production pattern and real downstream requirements. If those are properly defined at the start, the machinery decision becomes much clearer – and the line is far more likely to deliver consistent performance where it counts.