Application and Handling

A can carrier is a secondary packaging component that groups individual beverage cans into multipacks for handling, transport, display, and protection; carriers vary by material (plastic, paperboard, or hybrid) and influence line throughput, pallet stability, and logistics costs.

Definition & scope:

A can carrier is a secondary packaging solution used to unitize individual beverage cans into a single handling unit (a multipack). Carriers can be made from molded plastics (e.g., HDPE), injection-molded rings, corrugated or solid paperboard, or hybrid constructions combining board and adhesive. Their primary purposes are to keep cans together for point-of-sale display, protect the product from contact damage, enable efficient picking and stocking, and improve pallet stability during storage and transport. In beverage manufacturing and distribution, the can carrier selection affects production line speed, secondary packaging cost per case, warehouse space utilization, and sustainability credentials.

Why carriers matter operationally:

Carriers are part of the unitization strategy that translates factory output into a form suitable for warehouse storage and transportation. The right carrier reduces handling steps, minimizes load shifting on pallets, and can lessen the need for additional tertiary packaging like shrink wrap or slip sheets. Conversely, a poor choice can create bottlenecks on the canning line, increase damaged goods, cause inefficient pallet patterns, and raise overall landed costs.

Design considerations:

Manufacturers should evaluate carriers against a set of practical criteria, including material compatibility with existing applicators, tack time impact, stacking and compression behavior, storage footprint when empty and filled, environmental goals, and total cost of ownership.

• Application machinery compatibility: One of the first checks is whether the carrier works with the company’s current applicators and conveyors. HDPE and molded plastic ring carriers often integrate easily with high-speed automatic applicators and have minimal tack time (the time required for the applicator to place and secure a carrier around cans). Paperboard carriers may demand specialized folding, gluing, or tab-locking machines and can increase cycle time if machinery is not specifically set up for that board format. When switching carrier types, manufacturers should plan mechanical adjustments, sensor recalibration, and spare parts availability to avoid downtime.
• Tack time and line throughput: Tack time refers to the duration and rhythm of the packaging step relative to the filler’s output. If a carrier’s application process is slower than the canning line’s output, it becomes the bottleneck and reduces overall throughput. For high-speed lines, low-tack, machine-friendly carriers (often plastic) tend to preserve line speed; well-engineered paperboard systems can match speeds but usually require proper applicators and operator training.
• Stackability and compression strength: Carriers influence how loads behave under vertical compression. Paperboard multipacks arranged in brick-like patterns increase contact area between cans and adjacent multipacks, improving vertical load distribution and reducing the risk of load settling or shifting during transport. Molded plastic rings offer good individual can restraint but can produce a less continuous surface, potentially necessitating additional wrapping or tier sheets to achieve the same pallet stability as board-based multipacks.
• Storage footprint and logistics density: Carriers are typically shipped flat or nested to reduce inbound volume. The amount of space empty carriers occupy and how densely they ship influences inbound freight costs and storage needs. Paperboard carriers usually nest and stack very flat, maximizing inbound trailer density; some plastic systems also nest but may occupy more volume depending on design. Maximizing flat shipment density lowers the per-carrier inbound cost prior to canning and is an important lever in total logistics cost reduction.
• Sustainability and end-of-life: Paperboard carriers are often favored for recyclability and renewable sourcing, while HDPE rings can be durable and reusable or recyclable where streams exist. Environmental policy, retailer requirements, and consumer perception should guide material choice and influence procurement decisions.

Implementation best practices:

• Run pilot trials on production lines to measure actual tack time, rejection rates, and downtime impacts before full-scale conversion.
• Coordinate with carrier suppliers and machinery OEMs early to ensure applicator compatibility and spare parts availability.
• Model total landed cost: include carrier unit cost, inbound shipping of empty carriers, applicator or retrofit capital expenses, line-speed effects, damage reductions, and warehouse density savings.
• Test pallet patterns with filled multipacks to evaluate stack stability and compression behavior under expected transport forces. Use instrumented dummy loads if needed.
• Establish handling and storage procedures for empty carriers to preserve nesting density and minimize damage in the supply of packaging to the line.

Common mistakes and how to avoid them:

1. Selecting purely on unit cost: Choosing the cheapest carrier per unit without accounting for inbound shipping density, applicator changes, and line speed impacts often increases total cost. Avoid by calculating total cost of ownership.
2. Ignoring machinery compatibility: Assuming a carrier will work on an existing applicator can cause unplanned downtime. Conduct machine compatibility checks and vendor-supported trials.
3. Underestimating pallet behavior: Not testing how multipacks interact on a pallet can lead to load shifting and product damage. Perform pallet pattern trials and vibration testing where possible.
4. Poor supply chain coordination: Failing to manage carrier inventory and shipment density results in higher inbound freight and storage costs. Implement JIT deliveries and track flat storage utilization.

Real-world example:

A medium-sized beverage producer switched from molded plastic rings to a paperboard multipack system to meet retailer sustainability criteria. They engaged the carrier supplier and applicator OEM to run a two-week production pilot. Results showed a slight reduction in peak line speed due to applicator changeover times, but the company offset this by optimizing changeover routines and gained a 20% improvement in pallet stacking stability. Inbound shipping costs for empty carriers fell by 35% because the board nested flatter than the plastic rings, and the retailer contract incentives for recyclable packaging improved the brand’s shelf placement and sales.

Decision checklist for manufacturers:

• What is the current and target canning line speed? Will the carrier maintain that throughput?
• Does current equipment accept the carrier, or is capital investment required?
• How do carriers perform in pallet stacking and compression tests?
• What is the inbound logistics cost and storage footprint of empty carriers?
• Are sustainability goals or retailer mandates influencing material selection?
• What are the end-of-life pathways (recycle, reuse, waste) and related costs?

Conclusion:

The choice of can carrier is more than a packaging decision; it is a logistical and operational lever. Properly evaluated, a carrier can increase line efficiency, reduce secondary and tertiary packaging needs, improve pallet stability, and lower inbound and warehousing costs. The best approach combines pilot testing, cross-functional evaluation (production, packaging, procurement, logistics), and a full total-cost analysis that includes material, machinery, handling, and sustainability impacts.