Corrugated packaging, engineered to the lane

Constructions

The construction is chosen from how the pack is filled, closed and handled, not from habit. Regular slotted cases remain the efficient default for most shipping. Half-slotted and telescoping designs suit heavy or top-loaded product. Die-cut formats - crash-lock bases, front-open cartons, book wraps and mailers - earn their tooling where the line speed, the presentation or the returns process depends on them.

Board: flute and grade

Flute profile decides the trade between cushioning, stacking and print. Under DIN 55468-1:

Double-wall combinations - BC for strength with crush resistance, EB where print also matters - take over when single-wall cannot carry the derated load. Triple-wall follows for heavy export.

Grade is specified against the failure mode: ECT where the box stacks, burst where it is punctured and roughly handled. Choosing burst to solve a stacking problem buys heavier liner and still crushes - a common and expensive substitution.

Liners and medium

Liner choice - kraftliner or testliner, brown or white - changes strength, printability and cost, and availability differs by region and season. We specify to the performance and the test the board must satisfy so a regional plant can meet it with locally available furnish, rather than mandating one mill's product across three continents and building a supply risk into the drawing.

Coatings

Where moisture, grease or cold chain demand it, coatings are available - and each one carries a recyclability consequence. Wax performs and is generally not repulpable; water-based dispersion coatings can hold moisture back while remaining recoverable, subject to the actual recovery stream accepting them. We will tell you which trade you are making before you make it.

Tolerances and what we hold

Dimensions are measured between creasing centrelines, or between a crease and the associated outer edge, to a tolerance ladder that scales with size - tighter on small boxes, proportional on large ones. Machine-erected cases often need tighter tolerances than the general ladder; tell us at quotation, because a tolerance nobody specified is not one anybody owes you. Flute direction runs to the drawing and is verified - rotated flutes look identical on the pallet and lose a large share of the compression strength.

Proof, not assurance

Every specification is tied to a method: ASTM D642 for compression, ASTM D4169 or the matching ISTA profile for the lane, conditioned to 23 C / 50% RH so the number means something. Lot acceptance runs on ISO 2859 sampling with defect classes agreed up front. Ask for the report on any pack we quote.