1. In-mold labeling must have sufficient stiffness to ensure the label does not bend or deform during multiple transfers.
2. The surface of in-mold labeling must be smooth and have a good feel. Labels must not stick together, and there should be no static electricity after die-cutting to ensure that the robotic arm picks up only one label at a time.
3. The edges of in-mold labeling must be neatly die-cut, and neither side of the label should be damaged.
4. The inks and varnishes used for printing labels must withstand high pressure and high temperature. Under high pressure and high temperature environments, the ink must not peel off, change color, or become distorted, and the label must not wrinkle, bubble, or deform.
5. In-mold labeling for blow molding also requires an embossed or frosted surface on the back of the label to facilitate the expulsion of air between the bottle and the label during blow molding. Labels for injection molding generally do not require special back texturing.