Insight · 10 June 2026
Why Your Tray and Lidding Film Should Come From One Supplier
The most common failure point in rigid food packaging is the interface between two components bought separately. It is also the most avoidable.
Ace Packaging Inc.
A sealed tray is one system pretending to be two purchases. The tray comes from a thermoformer, the lidding film comes from a converter, and the seal between them is the responsibility of whoever is running the tray sealer at three in the morning when it starts failing.
The interface is where tolerance stacks
Flange flatness, flange width, tray material and its seal initiation temperature, film sealant chemistry, seal bar temperature and dwell - the seal is the product of all of them. Each supplier is inside their own tolerance. The stack-up is nobody's.
When that stack-up drifts, the symptoms are familiar: intermittent leakers that pass a visual check, peel force that varies across the pallet, and a seal that works on the line but fails after a week in distribution.
What changes when both come from one place
The tray and the film get specified against each other rather than against a generic counterpart. Seal windows get established on the actual pair, not on a representative sample. And when something drifts, there is one supplier accountable rather than two pointing across the gap.
We make both. For ready meal and chilled applications, that is usually the single biggest reliability improvement available.