Can case export packaging wall thickness just be set at 3 mm?

No. 3 mm holds at 23 °C, but 60 °C sag reaches 2.9 mm and breaks the 2.5 mm limit.

Why derive the interior from stack height, not volume?

Volume says how much fits, stack height says what the lid carries: 104 kg at 4 high.

Is 2 latches enough for case export packaging?

900 N split two ways is 450 N per latch, past the 320 N rating.

The hand samples passed, so why check the first shot?

Hand samples are machined and even. Blow-moulded thin spots sit on the parting line, where 0.5 mm of drift is routine.

Where does the 60 °C check come from?

Cases under equatorial sun see up to 65 °C inside a container, so 60 °C carries margin. Cold routes are checked at -25 °C.

What numbers belong on a case export packaging spec sheet?

Interior and tolerance, wall and thinnest point, rib pitch and height, latch count and rating, stack height and payload.

620 Cases: Case Export Packaging Specs from 26 kg Payload

Quick answer: Case export packaging specs run backwards from the load: a 26 kg payload stacked 4 high sets a 520×380×210 mm interior, a 2.5 mm deflection limit sets a 3.2 mm wall, and 900 N of gasket force sets 4 latches.

Case Export Packaging Specs: From Load to Wall
Deriving the Interior from Load and Stacking
Wall Thickness from a Deflection Limit
Sharing Force Across Latches, Hinges and Gasket
Prototypes and Four Validation Tests
FAQ

1. Case Export Packaging Specs: From Load to Wall

In April 2026, 620 export cases shipped to Rotterdam at 26 kg, 4 high. Three lids arrived dished 6 mm: the wall was set at 2.6 mm for 23 °C, ignoring a 35% modulus drop at 60 °C. The rework rebuilt 5 links, from load to interior to span to wall to rib pitch.

Link	Input	Output	This run
Load	Payload, stack	104 kg	26 kg, 4 high
Interior	Volume, clearance	520×380×210 mm	41.5 L
Wall	Span, deflection	3.2 mm	2.5 mm limit
Ribs	Wall, sag	90 mm pitch	6 mm high

Shipping space closes the envelope first: 2.35 m of container width fits 4 cases at 536 mm, 10 rows along 5.9 m.

2. Deriving the Interior from Load and Stacking

The first gate is the human hand: two workers top out at 26 kg, and 30 kg needs a helper panel. Gross weight is pinned at 27.5 kg, leaving 26 kg of payload.

Case Export Packaging: green case latch at the corner, three parallel ribs on the lid edge and a square pad

A net 41.5 L rounds into 520×380×210 mm with diagonals within 2 mm. Depth follows the stack: 4 cases plus pallet reach 1.86 m and clear a door header.

Stack height, not volume, fixes bottom compression. The lowest case carries 3 above plus itself, or 104 kg.

The 8 mm per side is 3.2 mm wall, 6 mm rib and 1.2 mm draft. Interior tolerance is ±1.5 mm; past that, cases touch at points and corners spall.

The envelope lands at 536×396×226 mm: 4 per layer, 20 over 5 layers, 550 kg against a 1000 kg pallet rating.

3. Wall Thickness from a Deflection Limit

Treat the lid as a simply supported plate: 520 mm span, 26 kg uniform, 2.5 mm allowed. A 2.6 mm sheet sags 2.1 mm at 23 °C, then 3.4 mm at 60 °C, missing by 36%.

At 3.2 mm the second moment rises 1.9 times and sag returns to 1.8 mm, leaving 0.7 mm. That costs 0.4 kg per case, 248 kg across the run.

Ribs do the rest: pitch from 120 mm to 90 mm removes 0.6 mm of sag for 0.15 kg, at 6 mm height and a 2 mm root radius.

Wall	Rib pitch	Sag at 60 °C	Payload
2.6 mm	120 mm	3.4 mm	18 kg
3.2 mm	90 mm	1.8 mm	26 kg
3.8 mm	75 mm	1.2 mm	34 kg

4. Sharing Force Across Latches, Hinges and Gasket

A gasket squeezed 30% pushes back with 900 N, all of it on the latches. Four take 225 N each against a 320 N rating, a factor of 1.42; two take 450 N and pop open within 2 hours of sea vibration.

Case Export Packaging: upright green case with folding handle raised, moulded marks and hinge pins at the corners

Two hinges run 5 mm pins in 304 stainless, and 8000 cycles must add no more than 0.2 mm of play. The hinge boss is 1.5 mm thicker than the latch boss.

The gasket is 8 mm EPDM, and 30% squeeze means 2.4 mm. A 0.05 mm feeler should not enter past 10 mm around the rim; 20 mm means that stretch leaks.

Hardware takes 48 hours of salt spray, and red rust means new plating. The handle is rated 40 kg static, 1.5 times payload.

5. Prototypes and Four Validation Tests

Three hand samples take 7 days, machined from 3.2 mm sheet with bonded ribs: good for dimensions and latch feel, silent on blow-moulded wall spread.

Four tests follow: a 1.2 m drop, 10 drops across one corner, three edges and six faces; a 480 kg stack for 24 hours with sag capped at 2.5 mm; 30 minutes of rain at 100 mm per hour; 4 hours each at -25 °C and 60 °C.

Tooling is 2 cavities at 180 t clamp and a 95 s cycle: 300 pieces minimum, ¥86,000, 35 days. The first shot reads 5 wall points, thinnest above 2.9 mm.

Test	Method	Pass line	If failed
Drop	1.2 m, 10 drops	No structural crack	0.4 mm at corners
Stack	480 kg, 24 hours	Sag ≤2.5 mm	Pitch to 75 mm
Rain	30 min, 100 mm/h	No trace inside	More squeeze
Thermal	-25 °C and 60 °C	Shift ≤0.3%	More draft

Conclusion

The 620 cases ended at a 520×380×210 mm interior, 3.2 mm wall, 90 mm rib pitch and 4 latches at 320 N, with lid sag of 1.8 mm after rework. A spec is a chain from 26 kg of payload to 3.2 mm of wall, and any skipped link returns at goods-in inspection. Write all 5 into the drawing and case export packaging becomes reproducible.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.