Ready meal packaging for chilled, frozen and shelf-stable ranges
A ready meal pack is decided by one question before any other: at what temperature does it live, and at what temperature is it eaten? Chilled, frozen and ambient shelf-stable are three different products with three different packs, and a format that suits one is usually wrong for the others.
Retort pouches sterilised at 121 °C
CPET trays from −40 °C to 220 °C
Modified-atmosphere trays for chilled ranges
Oven, microwave and freezer specified together
Three routes, three packs
What the temperature regime decides for you.
Shelf stable, sterilised in the pack
The food is filled, sealed and then cooked at 121 °C under pressure. What comes out needs no refrigeration and keeps for up to two years. That is a retort pouch or a retortable tray, and nothing else — the structure, the seal width and the fill level are specified together because a pack that passes a cold leak test can still fail at temperature.
Frozen, reheated in its own tray
A frozen meal has to go from a freezer into a conventional oven without being transferred, which rules out every tray material except CPET and foil. CPET runs from −40 °C to 220 °C, which covers both ends with room to spare.
Chilled, sold on appearance
A chilled meal is bought with the eyes and lives for days, not years. That is a modified-atmosphere pack: a sealable tray, a gas mix chosen for the food, and an anti-fog lidding film so the product is still visible after an hour in a cabinet.
Reheating is part of the specification
Microwave only, oven only, or both, changes the tray material and the lid. So does whether the consumer is expected to pierce the film, peel a corner, or remove the lid entirely. These are decided before tooling, not after.
Formats for ready meal packaging
The packs the three routes land on.
Retort pouch
Sterilised at 121 °C with the meal inside. Flat, stand-up or spouted, with a two-year ambient shelf life.
CPET tray
Freezer to conventional oven in the same tray, −40 °C to 220 °C, with the best barrier of any tray we make.
MAP tray
Chilled ranges with the air replaced by a gas mix, sealed under anti-fog lidding film across the whole rim.
PP tray
Hot food, takeaway and microwave-only ranges. Rigid, oil resistant and the most economical at volume.
Aluminium foil tray
Oven safe to 400 °C with a complete barrier — the standard for airline meals and bakery-style ranges.
Spout pouch
Sauces, soups and pourable components, retortable in PET/NY/AL/PE for shelf-stable lines.
Structures that suit it
Shelf-stable meals are built on PET/NY/AL/PE: nylon for puncture resistance through the retort cycle, aluminium for the oxygen barrier that makes a two-year life possible. Chilled trays are APET or PP with a sealable rim; frozen-to-oven is CPET or foil. The lidding film matters as much as the tray — it has to seal cleanly to the rim material, survive the same temperatures, and peel or pierce the way the pack promises. See materials and structures, and trays and containers for the full range.
What has to be provable
Sterilised and chilled foods carry the heaviest documentation of anything in this catalogue. Food-contact declarations to FDA or GB standards are the baseline; retorted products additionally need evidence that the structure and the seal were validated at temperature, and chilled MAP packs need the gas mix recorded. Reheating instructions on the pack have to match what the material actually tolerates, which is a liability question as much as a labelling one. Quality and compliance lists what we hold and what we test.
The rules themselves are public: FDA 21 CFR 177, the US list of permitted food-contact polymers.
Questions we are asked about ready meals
Can one pack be both microwave and oven safe?
CPET and aluminium foil both go in a conventional oven; CPET also goes in a microwave, foil does not. If the range has to do both, CPET is the usual answer.
What shelf life does a retort pouch give?
Up to two years at ambient with a PET/NY/AL/PE structure, subject to the food and to validation of your own process. Without the aluminium ply it is considerably less.
Do you supply the lidding film as well as the tray?
Yes, and they should be specified together — a lidding film that seals well to APET may not seal to CPET, and the peel strength is a property of the pair rather than of either one.
How is a MAP gas mix chosen?
By the food. Fresh meat usually takes oxygen and carbon dioxide to hold colour and suppress bacteria; cooked food and fish usually take nitrogen and carbon dioxide with no oxygen at all. Tell us the product and we will specify it.
Can a ready meal pack be recyclable?
Mono-material trays and lidding films exist and are collected in some markets. They carry less barrier, so shelf life has to be revalidated rather than assumed — and the claim has to hold where the pack is disposed of.
What do you need to quote?
The temperature regime, the fill weight, the shelf life, the reheating method and the filling line. Those five decide almost everything else.
Start with the temperature, not the tray
Chilled, frozen or ambient shelf-stable leads to three different packs. Tell us which, plus how the meal is reheated, and the rest of the specification follows.
Key Information
Ready meal packaging is decided by one question before any other: at what temperature does the meal live, and at what temperature is it eaten. Chilled, frozen and shelf-stable are three different packs, not three versions of one.
- The three routes are chilled, frozen and ambient shelf-stable, and each needs a different structure.
- Shelf-stable ready meals are retorted, which requires a structure qualified at 121 °C or 135 °C.
- A tray and its lidding film have to survive the same process together.
- Frozen packs need a laminate that stays flexible below zero rather than going brittle.
- Microwaveability is a property of the whole pack, including the lidding film and any valve.
What packaging does a shelf-stable ready meal need?
A retort-qualified structure — typically PET/NY/AL/PE for a pouch, or a CPET tray with a lidding film rated for the same cycle — qualified at 121 °C or 135 °C.
Can one pack cover chilled and frozen?
Sometimes, but the frozen version needs cold-flex performance the chilled one does not, so the laminate is usually different.
What decides between a tray and a pouch?
The process and the eating occasion. A tray suits oven or microwave heating in the pack; a pouch suits retort and a lower pack cost.