Material Compatibility: Labels must select materials that fuse with the injection molding raw materials. The most common is polypropylene (PP), followed by high-density polyethylene (HDPE).

Back Adhesive Layer: The back of the label is usually coated with a special synthetic adhesive layer (hot melt adhesive), which can greatly enhance the bonding force with molten plastic during high-temperature high-pressure injection molding.

Curved Surfaces & Shapes: Container surfaces should avoid overly sharp angles or deep grooves as much as possible. Smooth or slightly curved surfaces are most conducive to high-flatness label application.

Mold Venting Design: The mold must have a good precision venting structure to prevent residual air behind the label from forming bubbles or defects during label feeding and injection molding.