A foil tray that passes every generic takeaway spec can still fail an airline-catering line on day one. It has to land inside a roughly 370 × 213 mm galley footprint at ±2 mm, hold a segmented multi-compartment draw, and reach the galley oven with a temper that survives convection reheat.
The galley fit, the segmented draw, and the reheat temper are three constraints a takeaway pan never sees. Many airline trays are CPET plastic; this is the aluminum-foil case, which asks specific things of the tonnage, the tooling, and the alloy-temper.
The tonnage requirement comes from the draw geometry, not the headline machine rating. Get the galley fit, the segmented-draw force, the cavity class, and the reheat temper right, and the line runs; miss one and the tray fails on the cart, on the press, or in the oven.
The galley cart sets the binding constraint, holding the tray to about ±2 mm. The footprints below are representative — exact figures vary by cart maker — but the tolerance does not move.
| Tray standard | Footprint (mm) | Meals per cart |
|---|---|---|
| ATLAS standard | 370 × 213 × 15.5 | 32 |
| ATLAS extended | 495 × 213 × 15.5 | 48 |
| KSSU standard | 356 × 242 × 13.5 | 28 |
ATLAS and KSSU are not interchangeable. The two cart systems share roughly the same height (about 103 cm) and width (about 30.5 cm).
What differs is the side length, by around 2 cm — ATLAS near 40.5 cm against KSSU near 42.5 cm. A KSSU accessory does not fit an ATLAS cart, or the reverse — so a line tooled for one standard is not tooled for the other.
The modular container sizes nest inside that envelope on a fixed grid. A full unit sits near 210 × 134 mm, a half at 105 × 134 mm, a quarter at 105 × 67 mm, a sixth at 70 × 67 mm. Each step holds the same ±2 mm to seat in its slot.
That tolerance flows backward into die accuracy and press repeatability, where the production decision actually starts. A takeaway pan can run ±0.5 mm loose unnoticed; an airline tray at the same looseness gets rejected at the cart. The specification that matters most here is the dimensional one.
The tonnage requirement depends on the draw geometry, and a segmented airline tray crosses into true deep drawing. The shallow-versus-deep boundary sits near a 0.5 depth-to-minimum-dimension ratio.
Below it, a flat takeaway pan forms cleanly on a mechanical press at high stroke rate. Above it, the deeper compartmented tray shifts toward hydraulic forming and a higher clamping force.
The draw ratio on a first draw is limited to roughly 1.8–2.0, and aluminum thins by about 15 % before tearing becomes likely.
Push a deep compartment past that and the wall splits or the corner perforates. A multi-compartment tray runs several local deep draws at once, so the force budget must cover the deepest cavity, not the average.
Press class then follows from foil gauge and depth:
Matching the press class to that gauge and depth is the call that keeps a deep tray from under-tonning.
Tonnage is a draw-geometry decision, not a nameplate number. Blank-holder force, die clearance, and lubrication solve most deep-drawing problems; set them wrong and you get insufficient forming or excessive thinning at the corners.
A 45-to-120-ton press line, like MTED’s C-type and H-type platforms, gives the headroom to form a deep segmented tray without running the foil to its thinning limit. Size it to the deepest compartment’s draw ratio.
Multi-compartment geometry forces multi-cavity tooling, and the throughput math makes the choice for you:
A small footprint supports two-to-four cavities per stroke without exotic mold work — the practical band for an airline-tray line.
The segmented tray is the harder die, not just the higher cavity count. A flat container is a single open cavity; a compartmented tray adds internal dividing walls.
The die then has to form and release several connected pockets in one stroke without tearing the foil at the wall junctions. That means more die surface, tighter draft control, and more places for metal flow to go wrong.
This tooling complexity is met with hardened mold cores in DC-53 or SKD11 steel, machined by wire EDM to roughly ±0.005 mm. That accuracy holds the ±2 mm galley tolerance after spring-back and wear.
Single-cavity tooling starts around $3,000–$5,000, and custom precision tooling carries a lead time of 15–31 days from drawing to trial run — so the cavity-class decision is also a schedule decision.
Die clearance directly affects whether a segmented draw survives. Run it too tight against the foil gauge and you burnish and thin the wall; too open and the compartment wrinkles.
Resolve the cavity count and die family before committing the press: the single-cavity versus multi-cavity choice drives both throughput and tooling spend.
The divider walls call for a dedicated tool, not a flat-pan mold, so the segmented-draw die geometry sits in its own class, with the die steel specified to that wall geometry.
The airline tray is over-constrained on temper. The deep segmented draw wants soft metal; the convection-reheat rigidity duty wants harder metal, and the resolution lands at O or H24 rather than a default H22.
Airline meal containers run a foil gauge of 0.055–0.090 mm. That is heavier than a household roll’s 0.010–0.025 mm and a notch above generic takeaway’s 0.060–0.080 mm, because the tray must hold compartment shape under a hot meal load.
Alloy choice tracks draw complexity. Manganese-bearing 3003 carries higher elongation and better heat stability, which makes it the workhorse for deep-draw airline trays and multi-compartment shapes — and it stays stiffer than 8011 at the same thickness.
8011 is medium-strength with an Erichsen deep-draw value around 6.5 mm or better. That suits gentle curves and shallow, cost-sensitive disposables, but it runs short on margin for a deep segmented compartment. For the deepest draws, higher-strength 8006 is the formability play.
| Alloy | Best fit | Temper for tray duty |
|---|---|---|
| 3003 | Deep, segmented, multi-compartment | O or H24 |
| 8011 | Shallow, gentle curve, cost-sensitive | H22 or H24 |
| 8006 | Deepest draws needing extra strength | O |
Temper is the part most lines get wrong by picking one number for two jobs. O temper, fully annealed, gives maximum elongation for deep draws; H22 and H24 add rigidity for shallow containers and lids, with H22 the softer of the two.
Too hard and the foil cracks at the compartment corner. Too soft and the formed shape collapses under load.
O and H24 win for oven and retort trays because they balance the forming flexibility the draw needs against the rigidity the reheat needs. Get that O-versus-H temper call wrong and the tray either tears on the draw or sags in the oven.
Temper rides on the base metal, so the alloy-grade options for container forming set the window the temper then tunes.
Reheat is where foil earns its galley place: container alloys tolerate roughly −40 °C to 250 °C from frozen storage through reheat.
Aluminum is sometimes cited as high as +350 °C, but 250 °C is the conservative working ceiling — and even that clears the CPET limit near 220 °C. The metal does not melt, smoke, or drip. Pick 3003 in O or H24 for a deep segmented tray, and the same blank survives both the form and the oven.
A laminated or lacquered aluminum airline tray complies with the conditions of 21 CFR 177.1390 or 175.300 and is compliant with EU Regulation (EC) No 1935/2004. It is never described as “FDA-approved,” because the FDA does not approve individual trays.
Three frameworks govern the tray, and only two of them are food-contact:
Aluminium food-contact packaging falls under EU 1935/2004, and the food-grade certification path for global markets is what a buyer will ask you to document. State both food-contact rules as “complies with the conditions of” — the regulation sets conditions a compliant tray meets, not an approval stamp it carries.
That cabin standard is part of why metal is the conservative galley choice — aluminum is inherently non-combustible — though a foil tray is still not “FAR 25 certified” on its own.
Specify the foil to the 21 CFR and 1935/2004 conditions, and document any lacquer against 175.300.
Four questions decide whether your current line can quote an airline-tray program. Does the press hold the upper 45–120-ton band for a segmented deep draw without exceeding 15 % thinning? Does your die class run multi-cavity with divider-wall geometry, not just flat-pan single cavities?
Do you stock 3003 in O or H24 at 0.055–0.090 mm, not a default 8011-H22? And can the finished tray hold ±2 mm to the ATLAS or KSSU footprint while complying with the applicable 21 CFR section and EU 1935/2004?
Where a generic foil-container line falls short is rarely the headline machine rating. It is the temper stocked for shallow pans, the single-cavity die built for flat geometry, and the loose dimensional habit a galley cart will not forgive.
Any one of those is a sourcing or tooling fix, not a new press. Answer the four questions in order, then drill into the tooling, temper, or compliance decision behind whichever one you cannot yet clear.
