Covington GA & Sacramento CA
UNITED STATES
The short answer: for appliances, furniture, HVAC equipment and other large-format goods, honeycomb paperboard has largely replaced EPS foam corner blocks and wooden crating in the US. It carries the stacking load, absorbs handling impact, ships flat at a fraction of foam’s cube, and leaves the consumer or installer with a single recyclable material instead of a foam disposal problem. The design questions are corner geometry, deck capacity and how the product is restrained inside the pack.
Small-item packaging is mostly about preventing contact and cushioning drops. Large-format packaging is about three things small items rarely face.
Stacking load. A washer or a cased HVAC unit is stacked two or three high in a distribution center for weeks. The pack has to carry that load without settling, and settling is a creep problem rather than a strength problem.
Handling geometry. These products are moved by forklift, clamp truck and hand truck, and each applies force in a different place. A pack that survives forks can be crushed by a clamp.
Consumer-facing disposal. Appliances and furniture are frequently unpacked in the customer’s home or at a job site. Foam blocks and stretch wrap become the customer’s problem — and increasingly the retailer’s, since haul-away commitments are now common.
The single highest-value application. Corners carry the stack load and take the handling impact. Honeycomb corner posts transfer vertical load down the stack while protecting the case edge, replacing EPS corner blocks at lower cube and with no disposal issue.
Formed honeycomb caps locate the product, spread load across the top surface and prevent the case from being crushed inward by strapping. On tall products the top cap is what keeps the pack square.
A honeycomb deck under the product distributes fork and floor loads and keeps the product off the pallet surface. On export lanes this also removes ISPM 15 exposure.
Cut blocks immobilize doors, drawers, glass panels and loose components inside the pack, replacing the foam and tape combinations that customers find hardest to remove.
Corner posts are where most large-format packs succeed or fail, and three variables control performance.
Cross-section. An L-section resists in two directions and locates the case corner. A U or box section carries substantially more vertical load but costs more material and requires more precise placement.
Cell orientation. Cells must run vertically so the load path is along the cell axis. A post cut with cells running horizontally has a small fraction of the capacity, and this is a surprisingly common converting error worth checking on first article.
Bearing at top and bottom. A post is only as good as what it bears on. If the top cap is soft or the base deck flexes, the post punches through rather than carrying. Closing the post ends with a folded liner or a bearing pad routinely adds 20% to 30% of usable capacity.
The working method is straightforward. Take the weight of the units stacked above, divide by the number of corner posts carrying it, and check the result against the post’s sustained capacity rather than its instantaneous capacity.
For a 180 lb product stacked three high, the bottom pack carries 360 lb on four posts, or 90 lb per post. That is modest — until you apply the creep factor for six weeks in a DC and the humidity factor for an unconditioned warehouse in July, at which point the effective requirement can double.
Two further adjustments are worth making. Assume the stack will not be perfectly aligned, because it will not be; design for load on three posts rather than four. And check what happens when a clamp truck applies side pressure, which is the load case that actually crushes most appliance packs.
| Factor | Honeycomb | EPS foam | Wood crating |
|---|---|---|---|
| Stacking load | Very good | Moderate, creeps | Excellent |
| Impact absorption | Good | Excellent | Poor |
| Storage cube empty | Flat, minimal | Very high | Moderate |
| Weight added to pack | Low | Very low | High |
| Tooling | None with digital cutting | Molds required | None |
| Customer disposal | Single stream with the carton | Problem material | Wood waste, fasteners |
| Export | ISPM 15 exempt | Exempt | Treatment required |
| Retailer acceptance | High and rising | Falling | Neutral |
Foam still has the edge on pure shock absorption, which is why the strongest designs use honeycomb for structure and small foam pads only where a genuine impact-sensitive contact exists. That hybrid keeps foam volume to a few percent of what a fully molded solution would use.
Large-format goods increasingly ship through channels where the retailer removes the packaging. Big-box delivery, white-glove installation and appliance haul-away all put disposal cost on someone other than the consumer, and that someone is measuring it.
An all-fiber pack goes into the retailer’s baler with the carton. A foam pack requires separation, storage and a waste hauler. The cost difference per unit is small; multiplied across a national delivery network it is not, and it is now appearing in retailer packaging specifications as an explicit requirement rather than a preference.
The same logic applies under state EPR programs, where fees are modulated by recyclability and assessed on weight placed on the market. A pack that is heavier and harder to recycle pays twice.
For consumer-facing products, how the pack comes apart matters commercially. Three design choices consistently improve it.
Sequence. Design so the pack opens in an obvious order without tools. Products that require a knife to unpack generate scratched surfaces and warranty claims.
Component count. Every additional loose piece is another thing for the installer to manage and another thing to leave behind. Two well-designed components beat five simple ones.
Flattening. Honeycomb components should collapse or nest by hand. Where a component cannot be flattened, it will be stacked in a corner of the customer’s garage and remembered unfavorably.
Standard parcel protocols do not apply here. The relevant references are ISTA 3E for packaged products in unitized loads and the ASTM D4169 distribution cycles, with particular attention to the compression sequence.
Three physical tests matter more than the paperwork. A sustained compression test at design load for the real dwell time, because creep is the dominant failure mode. A clamp truck test, because clamp pressure crushes packs that pass every drop test. And an incline impact or rotational edge drop, which reproduces dock handling far better than a flat drop.
Run these before committing tooling or a rollout. A pack that passes a flat drop and fails under a clamp will generate damage that looks random and is not.
A Southeast appliance manufacturer shipped a 165 lb product in a double-wall case with four molded EPS corner blocks and a foam top cap, stacked three high in distribution.
The foam arrived on eleven truckloads a year and consumed roughly 2,400 square feet of warehouse floor because it could not be stacked densely. Two national retail accounts had raised packaging disposal in their annual reviews. And the corner blocks were tooled for a chassis revision that had been superseded, so a foam pad was being added by hand at the packing station to close a half-inch gap.
The conversion used 1″ honeycomb L-posts with closed ends, a formed top cap and a honeycomb base deck. Foam was retained only as two small pads at the glass door contact. Inbound truckloads dropped from eleven to two. Warehouse floor released was roughly 2,000 square feet. The hand-added pad disappeared because the new posts were cut to the current chassis, and re-cutting them for the next revision costs a file change rather than a mold.
Damage was unchanged at 0.3%, and the retailer conversation moved from a complaint to a case study.
Large-format packs frequently fail at the interface between the case and the internal components rather than in either one.
Three checks prevent it. Confirm the case internal dimensions against measured samples rather than the specification, because large corrugated cases carry wide tolerances. Verify that corner posts bear on the case flaps rather than in mid-panel, since a post bearing on an unsupported panel will push through it. And check strapping position: a strap applied across a post transfers load correctly, while a strap applied between posts crushes the case wall.
In most appliance and furniture applications, yes. Where a specific component is impact-sensitive, a small foam pad at that contact point combined with honeycomb structure gives better protection than foam alone, at a fraction of the foam volume.
Well, provided the posts are positioned where the clamp bears and the cells run vertically. Clamp damage is nearly always a placement problem rather than a material problem.
Commonly 1″ to 2″ depending on stack height and product weight, with the section geometry doing as much work as the thickness. A well-designed 1″ L-post can outperform a poorly bearing 2″ flat block.
Not necessarily. A honeycomb base deck handles many large-format products, and on export lanes it removes ISPM 15 obligations. For very heavy equipment or racked storage, wood or a hybrid remains appropriate.
Large-format packaging is a stacking and handling problem before it is a cushioning problem. Honeycomb carries the load, ships flat, and leaves a single recyclable material at the customer’s door — which is increasingly a retailer requirement rather than a nice-to-have. Design the corner posts and the bearing surfaces properly and the rest of the pack gets simpler.
Premier Packaging Products designs and manufactures honeycomb structural packaging for appliance, furniture and industrial equipment manufacturers from both coasts. See our consumer goods capabilities or request a design study.