In-mold labels can pass these 7 rules to accept

In the past two or three years, the application of in-mold labels in the field of seasonings such as rice wine and bean paste, as well as snack foods such as candy, has begun to increase, and the application field has been expanding. However, in-mold labels have special quality requirements. What are the reference acceptance criteria for in-mold label printing ?

Printing material acceptance

1. Require the physical and chemical indicators of each batch of printing materials to be consistent, including material thickness, stiffness, whiteness, gram weight, surface smoothness and surface tension. If the material is to be replaced, the printing process and the application test of the label on the bottle blowing machine should be re-updated in order to update the relevant data.

2. Require each material supplier to provide standard material data files.

print

There is no difference in the printing of in-mold labels through ordinary plastic film printing, so the printing standard suitable for plastic film materials is completely suitable for in-mold label printing. Can refer to "Common Printing Standards Compilation"

UV glazing

Since there are no UV glazing quality standards at home and abroad, the commonly used quality inspection standards are:

1. Select glazing oil with good transparency, no yellowing after use, small shrinkage deformation and high smoothness;

2. After UV curing, the smell is small, it is not sticky, and the labels are not stuck;

3. After the label is glazed, the surface is saved flat and cannot be bent to avoid problems during application.

4. It is required that the glazing surface is bright, the glazing oil has good leveling, and there is no obvious ripple.

5. The method of glazing oil fastness detection is usually detected by using 3M-810 adhesive tape.

Die cutting

1. Die-cut overprint standard with letterpress die-cut overprint standard (0.5mm) ;

2. The label edge is required to be neat and tidy;

3. Avoid separating or peeling off the rubber layer on the back side of the edge;

Hot stamping

1. The surface of the bronzing is required to be flat and the height error with the surrounding surface is (±0.2mm)

2. The bronzing edge is required to be flat and cannot be sawtoothed.

3. The surface of the bronzing is required to have the same color, avoiding the phenomenon of blisters and galvanized aluminum falling off.

Electrostatic value standard

Requires the electrostatic value before label packaging is less than 0.5kV

Packaging and storage

1. Each manufacturer packs according to their own habits and customer requirements;

2. The finished product label is stored in a constant temperature, constant humidity warehouse. The recommended temperature is ( 22 ± 2 ) ° C and the humidity is greater than 60%.

The in-mold label is the label with the best decoration effect in the label family. The surface of the container after application has a label-free feeling, which overcomes the shortcomings of the traditional self-adhesive label.

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