What is in-mold labeling (IML) and how is it different from a regular applied label?

In-mold labeling places a printed label inside the plastic injection or blow mould before the container is formed, so the label fuses permanently into the container wall as the plastic sets. This differs fundamentally from a regular applied label, which is added to an already-finished container using adhesive or heat after moulding.

Because the IML film becomes chemically bonded to the container material during moulding itself, the label and the container become a single, inseparable unit rather than two separate components joined by adhesive. This means an IML label cannot peel, lift at the edges, wrinkle, or fade away from the container, since there is no adhesive layer to fail; the label’s lifespan is effectively the same as the container’s lifespan.

A regular applied label, whether self-adhesive, wet glue, or heat seal, is manufactured separately and then added to the container afterward on a labelling line, meaning its bond depends on adhesive performance, surface preparation, and environmental exposure over time. IML also delivers full 360-degree coverage with no visible seams or label edges, since the graphic is part of the container surface itself, and because the IML film is typically made from the same resin family as the container, the whole unit is generally recyclable as a single mono-material item without needing to separate a label from the container first. The trade-off is that IML requires the label to be planned at the mould design stage, so it is not something that can be added to an already-existing container design without retooling.