In the mold label process is the combination of the labeling operation and blow molding or injection molding process, but the plastic products after the paste label process. In the process of die-marking, the pre-printed and die-cut labels are stacked in sheet form and placed in the label box; With the opening of the mold, the label is pulled up one by one by the mechanical hand and positioned in the open mold. The printing surface of the label is inward, the surface coated with solid adhesive is outward, and the label is firmly attached to the mold wall by vacuum negative pressure or electrostatic adsorption.
When the mold closes, the melted plastic resin enters the mold and forms. At this time, the temperature in the mold is relatively high, and the label of the prototype container, the solid adhesive starts to melt and integrate with the plastic container. When the mold is opened again, the plastic container is formed, and the label and the container become one part of the molding container.
The biggest difference between the inner label and the traditional label is the different way of labeling. The inner label is not pasted after the plastic container is fully formed, but is formed once with the container. Due to the different labeling methods, there are certain requirements on the characteristics of labels used in the in-mold labeling process:
1. The label should have a certain degree of stiffness to ensure that the label is not bent or deformed during the transmission process;
2. The surface of the label should be smooth, non-adhesion between the labels, there should be no static electricity, to ensure that only one label is absorbed by the manipulator at a time;
3. Label edge should be neat, the label can not be damaged on both sides;
4. The printing label USES ink and gloss to withstand high pressure and high temperature.