The in mold label IML process integrates labels with plastic components to achieve efficient and durable surface decoration effects. The core process can be divided into the following six key steps:

1. Label printing
Process: Printing patterns, text, and labels on the surface of in mold label IML substrates such as PP and PE.
Technical points:
Using high-precision printing equipment (such as gravure printing, digital printing) to ensure color reproduction and resolution.
Ink needs to have high temperature resistance and chemical corrosion resistance to adapt to the injection molding environment.
Result: Obtained printed in mold label IML with design patterns, typically with a thickness of 0.04-0.08mm.
2. Surface treatment of in mold label IML
Electrostatic treatment: By using an electrostatic generator to make the surface of the in mold label IML charged, the adsorption properties are improved, making it easier for subsequent positioning.
Coating treatment: Some processes require coating hot melt adhesive or bonding agent on the back of the in mold label IML to enhance its adhesion with the plastic substrate.
3. Mold preparation and label positioning
Mold design: Customize the mold according to the product shape and reserve a label placement area.
Label positioning:
Manually or mechanically place the printed in mold label IML accurately into the mold cavity.
The edge of the label should be aligned with the edge of the mold to avoid displacement during injection molding.
4. Injection molding
Molten plastic injection: Inject molten plastic (such as PP, PE) into the mold to fill the cavity.
Hot pressing fusion:
High temperature (180-280 ℃) causes the in mold label IML to fuse with the plastic surface.
High pressure (100-300MPa) ensures a tight bond between the label and the plastic, forming an integrated structure.
Cooling solidification: Using a cooling system to quickly solidify plastic and shape the product.
5. Demoulding and post-processing
Demolding: After opening the mold, take out the molded product, and the label seamlessly adheres to the plastic surface.
Post processing:
Trim excess scraps.
Check the appearance quality (such as bubbles, wrinkles, printing defects).
6. Finished product inspection and packaging
Quality inspection:
Appearance inspection: Confirm the flatness and color consistency of the label.
Performance testing: Verify wear resistance and chemical resistance (such as packaging that comes into contact with food requiring relevant certification).
Packaging and storage: Qualified products are packaged and stored, waiting for shipment.