What Is IML Packaging? In-Mould Labelling Explained

IML (In-Mould Labelling) is a process in which a printed label is placed inside the injection mould and becomes part of the container's surface as the container is formed. The label is not applied afterwards: it fuses with the plastic during moulding. This is why IML packaging is widely used for food and consumer products that need high-quality graphics and a durable surface.

How Does IML Work?

1. Label preparation: A printed label, usually a PP-based film, is cut to the size of the container.
2. Label placement: With the mould open, the label is positioned on the mould surface, typically by automation.
3. Injection: The mould closes and molten polypropylene (PP) is injected.
4. Fusion: Heat and pressure bond the label to the container surface.
5. Cooling and ejection: The finished container leaves the mould already labelled; no separate labelling step is needed.

Benefits of IML Packaging

• High visual quality: Sharp, colourful graphics in gloss or matt finish, which can wrap around the container.
• Durable surface: Because the label is integrated into the wall, peeling is generally less of a concern than with adhesive labels, including in humid or handled environments.
• One production step: Forming and labelling happen in the same process.
• Shelf impact: The brand message can cover most of the container surface.
• Material compatibility: A PP container with a PP-based label stays within one material family, which can help recycling (actual recycling conditions depend on the country and facility).

IML vs Other Labelling Methods

Feature IML (in-mould) Adhesive label Direct printing When applied During moulding Separate step after moulding Separate step after moulding Visual result High resolution, part of the container Good; separate layer on the surface Depends on design and surface Peeling risk Low (label is integrated) Depends on conditions No peeling; wear is possible Artwork change Often a new label print is enough New label print New plate / setup Initial investment IML-ready mould and automation needed Low Medium

This is a general comparison; results vary by product and project.

Where Is IML Used?

IML containers are commonly seen in dairy products, sauces, salads and deli products, ready meals and dry foods, and in some non-food products. At Jetpak, the right container and lid are selected together based on your product, filling method and shelf environment.

Points to Consider

• IML-ready tooling: The mould and container design must be suitable for in-mould labels.
• Label size and artwork: Artwork must follow the container surface and mould tolerances.
• Colour approval: Samples and colour approval before mass production are recommended.
• Lid choice: Locking lid, printed lid or plain lid should be planned together with the container.
• Use conditions: Filling temperature, storage (fridge, freezer) and transport conditions affect the final specification.

IML Packaging at Jetpak Plastik

Jetpak Plastik is a Turkish manufacturer of PP (polypropylene) plastic packaging. Our packaging is made by injection moulding, with IML-eligible products and containers with locking lids. Product groups: Round, Square, Rectangular, Oval and Custom Design. Our PP packaging is suitable for food contact; which products and moulds can be used for IML is defined together with you per project.

Related pages: Products · Round Containers · Square Containers · PP Food Packaging · Custom Packaging Design

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With IML packaging, the label becomes part of the container surface during moulding—shelf presence and durability take shape in one process.

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