High Barrier Frozen Bag For Food Packaging

What this frozen bag is

This is a flexible pouch built for frozen food. The standard structure is PET/PE at 140 micron, though both the material combination and the thickness can be adjusted. PET gives the outer layer stiffness, printability and puncture resistance. PE forms the inner sealant layer and provides the moisture barrier that matters most below freezing.

The laminate blocks oxygen and helps inhibit bacterial growth, so frozen contents hold their quality for longer. It also protects against freezer burn, which is the main cause of texture and flavour loss in frozen products. The bag can be printed in custom colours and supplied in flat bottom, side gusset or stand up formats. Each format behaves differently on the filling line: flat bottom pouches stand unsupported on shelf, side gusset bags offer a wider fill opening, and stand up pouches work well for smaller portions.

Features and construction

The pouch is designed for direct microwave steaming. Food can be heated in the bag without removing it, which saves a preparation step for the consumer and reduces handling. This requires the sealant layer to withstand steam temperature without delaminating, and the structure to vent safely. If you need that function, specify it at enquiry stage so the film specification can be confirmed.

Every batch is tested across a range of performance checks. These include heat seal testing, drop testing, interlayer adhesion testing, seal strength testing, compression testing and puncture resistance testing. These tests cover the failure modes that matter for frozen distribution: seals that open under load, layers that separate, and punctures from sharp frozen edges. Certification is held by the manufacturing partner, not by Clover Packaging.

Where it is used

The bag suits frozen ready meals, frozen vegetables, frozen fruit, frozen seafood, frozen meat portions, frozen dumplings and frozen pet food. It also works for chilled and ambient food where a moisture barrier is useful. Common fill sizes range from single-serve portions up to family-size packs, depending on the pouch format and the density of the product.

Because the structure can be customised, the same bag type can be specified for different barrier requirements. A plain PET/PE laminate is usually enough for frozen vegetables and fruit. For products with higher fat content, a higher-barrier material may be needed to prevent oxidation over a longer shelf life.

Filling, sealing and material trade-offs

The pouch runs on standard form-fill-seal or pre-made pouch filling lines. Flat bottom and stand up pouches are usually filled on pre-made pouch machines, while side gusset bags can also be supplied as rollstock for vertical form-fill-seal. Seal parameters should be set for PE at the thickness you order; too little heat gives a weak seal, too much causes wrinkling and channel leaks.

PET/PE is not a mono-material structure, so it is not recyclable in the polyethylene stream. If recyclability is a priority, a mono-material PE or PP structure is available, but the barrier is lower than a foil-containing laminate. For frozen food with a short frozen shelf life, PET/PE often gives the best balance of barrier, strength and cost. For longer ambient shelf life, a foil or high-barrier structure is more appropriate.

Digital print runs start from 100 pouches or 10 kg of film, with a lead time of 10-15 working days after artwork approval. Rotogravure runs start from 10,000 pouches or 200 kg, with a lead time of 20-25 working days. Free stock pouch samples are available; you pay courier only.