Views: 0 Author: Site Editor Publish Time: 2025-07-18 Origin: Site
IML is a process where a pre-printed plastic film (label) is placed inside the mold before injection. When molten plastic is injected, the label fuses permanently with the product, creating a seamless, high-resolution decorative or functional surface.
Label Production
Materials: PP, PET, or PS films (compatible with the base resin).
Printing: High-temperature-resistant inks (screen, offset, or digital printing).
Label Placement
Robots or vacuum systems position the label precisely (±0.1mm accuracy).
Injection Molding
Molten plastic bonds with the label under heat and pressure.
Ejection
The finished product requires no post-processing (e.g., gluing or heat transfer).
| Feature | Benefit |
|---|---|
| Durability | Resistant to scratching, moisture, and chemicals. |
| Aesthetics | Enables 3D contours, glossy/matte finishes, and metallic effects. |
| Efficiency | Eliminates secondary labeling steps, reducing production time. |
| Eco-Friendly | No adhesives or volatile organic compounds (VOCs). |
Vacuum Adsorption: Micro-holes (0.3–0.5mm) in the mold hold the label.
Electrostatic Adsorption: Ideal for ultra-thin films (<0.1mm).
Venting: Prevents air traps between the label and molten plastic.
Cooling: Ensures even cooling to avoid warping.
| Base Plastic | Recommended Label Material | Example Applications |
|---|---|---|
| PP | PP film | Yogurt cups |
| ABS | PET/PC film | Appliance panels |
| PMMA | PMMA composite film | Automotive trims |
| Issue | Cause | Solution |
|---|---|---|
| Wrinkled/misaligned labels | Insufficient vacuum or misplacement | Optimize vacuum holes or robot precision. |
| Melt bleeding onto artwork | Low heat resistance of ink/film | Use high-temp inks (>200°C) or switch to PET. |
| Poor label adhesion | Material incompatibility | Modify film or apply surface treatments (e.g., corona). |
| Surface bubbles | Inadequate mold venting | Add venting channels or reduce injection speed. |
| Method | IML | OML (Out-Mold Labeling) | Traditional Labels |
|---|---|---|---|
| Process | Label fused during molding | Heat-sealed post-molding | Adhesive applied later |
| Durability | Excellent | Moderate | Poor (peeling risk) |
| Cost | High tooling, low per-unit | Moderate | Low tooling, high per-unit |
Food Packaging: Microwave-safe containers, ice cream tubs.
Cosmetics: Shampoo caps, luxury cream jars.
Electronics: Washing machine interfaces, switch panels.
Automotive: Dashboard trims, button overlays.
IML combines injection molding and decorative printing to produce high-end, long-lasting plastic products. While it demands precise mold design and material selection, the benefits—superior aesthetics, durability, and streamlined production—make it a preferred choice for premium brands.
