In mold labeling

In mold labeling injection molding

In mold labeling process overview

In-Mold Labeling (IML) is a sophisticated technique used in plastic injection molding that integrates the labeling process into the molding stage, resulting in highly durable and aesthetically pleasing products.

This process involves the insertion of pre-printed labels made of plastic, paper, or film into the mold before the plastic material is injected. These labels become an integral part of the final product as the plastic merges with the label, creating a seamlessly labeled product.

1. Process

Labels, typically made of the same material as the injected plastic, are pre-printed and cut to fit the dimensions of the desired product. These labels can have various finishes and textures to enhance the product’s visual appeal.

The pre-prepared labels are placed into the injection mold. This can be done manually but is often automated to ensure precision and speed, particularly for large-scale production.

Plastic material, often in the form of pellets, is heated until it becomes molten. It is then injected into the mold containing the label. The heat of the plastic ensures that it adheres firmly to the label.

As the plastic cools and solidifies, it bonds with the label, effectively embedding the label into the surface of the molded part. The label and the plastic become one, ensuring the label won’t peel, scratch, or wear off over time.

Once the plastic is cooled and solidified, the finished product is ejected from the mold. It is now a fully formed, labeled piece, ready for any additional finishing touches or directly for use or sale.

2. Advantages

Labels are not prone to wear, fading, or peeling as they are embedded into the product itself.

Allows for high-quality graphics and a wide range of finishes enhancing the visual appeal.

Integrating labeling with molding reduces the overall production time.

Can be more environmentally friendly, especially when using recyclable materials.

3. Applications

IML is widely used in various industries including packaging, consumer electronics, and automotive, among others. 

It’s particularly popular for producing containers, lids, and similar items where label durability and aesthetics are crucial. In conclusion, compression molding is a tried-and-true method for forming parts, especially from thermosetting materials. 

While it might not be as rapid or automated as some other processes, it remains valuable for specific applications and materials.


In conclusion, hot runner injection molding is a sophisticated technique that offers material savings, faster cycle times, and more consistent quality compared to traditional cold runner systems. The decision to use a hot runner system is often based on production volume, part design, material used, and overall project budget.

Have Questions about Plastic Injection Molding?

Please contact us, and we shall be happy to answer them!