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NEXALPACK — Sealing your ideas
ESENFRPT
Applications

Modified atmosphere packaging (MAP)

In MAP, the air in the pack is replaced with a gas mixture chosen for the product before sealing. It is common for fresh meat, sliced meats, cheese, ready meals and bakery products packed in trays.

Fresh baby greens in sealed retail trays; illustrative application example
Example sealed tray; compatibility is validated with product and materials.

How MAP works

1. Evacuation

The tray with the product enters the chamber and the vacuum pump draws out the air.

2. Gas flush

The machine injects the gas or gas mixture. On our tray sealers, N2 or N2+CO2; the NEX-350AZ and the rotary models state a gas replacement rate of 99.5% or more.

3. Sealing and cutting

The lidding film is heat-sealed onto the tray and cut. The barrier of the film and tray holds the atmosphere for the product’s life.

Gas flush or MAP with vacuum

Not every machine does the same thing. A gas-flush tray sealer such as the NEX-271 sweeps the air out with gas before sealing, without a vacuum pump. A MAP unit such as the NEX-272 first draws a vacuum in the chamber (20 m³/h pump) and then injects the gas, giving better control of residual oxygen.

The gas mixture, the barrier material and the storage temperature are defined for each product. The machine alone does not determine shelf life: it must be validated with your product, your packs and your cold chain.

Tray sealers and thermoformers for MAP

More models offer MAP: NEX-273, NEX-550M, NEX-370R, NEX-550A and NEX-650A. Compare them in the tray sealer range.

What we need to study your MAP project

Product, the planned gas mixture (if you already have one), tray type and size, film, packs per minute, target shelf life and whether the machine must be integrated in line with conveyors.

Discuss your application ↗

Modified atmosphere packaging FAQs

What is modified atmosphere packaging?

A packaging method in which the air in the pack is replaced with a gas or gas mixture (for example nitrogen, or nitrogen with CO2) before sealing, to help preserve the product.

What does MAP stand for?

Modified Atmosphere Packaging. It is also referred to as protective atmosphere packaging.

Which gases do your machines use?

Our tray sealer specification sheets list N2 or N2+CO2 as the flushing gas. The exact mixture is set by the food producer with its gas supplier.

What is the difference between MAP and vacuum?

Vacuum removes the air and the pack fits tightly around the product. MAP removes the air and replaces it with gas, so the product is not compressed: useful for sliced products, ready meals or delicate foods.

Keep exploring

Tray sealing machines

17 models, from tabletop units to automatic inline sealers.

Meat packaging machines

Vacuum, MAP and skin for fresh meat, sausages and sliced meats.

Tray sealing: what it is and how it works

Process, trays and lidding film step by step.

YOUR NEXT PACKAGING PROJECT

Great products deserve
exceptional packaging.

Tell us what you want to pack ↗