In-Mould Labeling (IML) is a packaging method where labels are placed inside the mould before the container is formed. During the blow moulding process, the hot plastic fuses with the label. The package exits the mould already decorated and ready to use.
How are IML labels printed?
IML labels can be produced using several printing technologies:
- Flexography
- Rotogravure
- Silk screen
- Offset
- Digital printing
The chosen process determines the final quality and can deliver near photo-quality results.
How does the In-Mould Labeling System work?
IVI’s IML system places die-cut labels into the mould cavity before injection molding. An electromechanical robot with multiple arms and grippers (one per cavity) handles pick-and-place. The mould features vacuum channels to hold labels in position.
IML cycle steps:
- Pick labels from the label baskets
- Transfer labels into the open moulds
- Apply labels to the half-mould surfaces using vacuum
- Close the moulds and form the parison
- Blow the container so the label fuses with the wall
- Open the mould and eject the finished, labeled product
Labels are usually made from the same plastic material as the container. During blowing, they contact the extruded parison, partially melt, and become part of the container wall.
Why choose In-Mould Labeling?
IML is efficient and sustainable because decoration occurs during moulding, without extra post-mould steps or equipment. Unlike pressure-sensitive labels, heat transfer, or shrink sleeves, IML does not require:
- Post-mould labeling machines
- Wet glue or hot-melt adhesive
- Additional labeling operators
- Extra floor space for conveyors and labeling machines
This reduces energy use, labor, waste (no release liners), and overall production time.
Advantages of IML labels
- Recyclable and sustainable: Labels can be made from the same material as the bottle, improving overall recyclability.
- Strong, non-removable adhesion: Labels won’t lift or peel, even if spills occur during filling.
- Smooth, premium appearance: No label edges; a seamless, glossy, screen-printed look.
- Precise application: No crooked labels, wrinkles, or bubbles.
Summary
The In-Mould Labeling System integrates labeling with product forming, delivering high-quality, durable, fully decorated packaging in a single step. It boosts efficiency, lowers costs, and supports sustainability—an ideal choice for modern plastic packaging. As a leading IML robot automation solutions company, IVIROBOT provides one-stop IML solutions. Contact our experts for more helpful advice.
