In the production of self-adhesive labels, die-cutting quality and printing quality have the same status. The quality of die-cutting directly affects the subsequent process of label processing, and even eventually leads to poor products. Therefore, every link of self-adhesive die-cutting can not be ignored. In the die-cutting process of self-adhesive labels, common die-cutting quality problems are: continuous die-cutting, die-cutting overflow, die-cutting backing paper cutting through and so on. Here are ways to solve these common problems:

First, die-cutting.

First of all, check whether the position of die-cutting is repeated. If it is repeated regularly, then the problem must be related to the die-cutting knife. In this case, if it is rotary die-cutting, the die-cutting pressure can be improved as a whole, which may solve the problem of continuous die-cutting and accelerate the wear of die-cutting knives. If the die-cutting problem cannot be solved within the range of increasing the allowable pressure, then a new die-cutting knife can only be replaced. If it is flat die cutting, you can adjust the pressure locally.

If the problem of die-cutting is not repeated regularly, then the problem may be caused by insufficient gear precision, running tension of materials and die-cutting pressure. In this case, it is necessary to check the running tension of the material and adjust the die-cutting pressure.

Second, die-cutting overflow glue

Die-cutting overflow refers to the overflow of glue on the edge of the label after the die-cutting process of the label, which is a common defect of self-adhesive products. Glue overflow will lead to label appearance defects, printing pollution, poor peeling and other problems. Die-cutting overflow problem is also solved from the following aspects:

1. Performance analysis of label materials: Different types of materials have different adhesive types, bonding processability and other characteristics. Therefore, before production, you should consult the relevant performance characteristics of the material suppliers and choose the materials suitable for your processing technology.

2. Control of label processing and storage environment: The temperature of label processing and storage environment should be controlled within 23 3 degrees Celsius and the humidity should be controlled within 55 5%. Excessive temperature and humidity will improve the fluidity of adhesive. In actual production, we can clearly feel that the phenomenon of die-cutting overflow is common in summer production, but rare in winter, which is the reason.

3. Quality control of label die-cutting: a sharp knife must be used for label die-cutting, and the obtuse blade will disturb the label adhesive, resulting in the overflow of the label edge when die-cutting. Too deep die-cutting pressure will also over-squeeze the label adhesive, while too shallow die-cutting pressure may lead to the stretching phenomenon of the adhesive during die-cutting, thus forming adhesive overflow on the label edge or label surface. Therefore, the choice of die-cutting knife is the key.

4. Control of label processing technology: During label processing, sliding friction on the label should be avoided, and die-cutting glue is easy to accumulate in the parts with sliding friction with the label, thus polluting the edge of the label. The location of this overflow on the label will have obvious regularity and directionality.

5. Label rewinding tension control: Excessive rewinding tension will excessively squeeze the label adhesive, and even cause the label to slip on the backing paper, causing the label to overflow. Non-square labels, due to the inconsistent axial rewinding tension, are easy to cause excessive local tension, resulting in local adhesive overflow of labels. Small square labels are also easy to overflow, because they bear more pressure under the same pressure.

Third, die-cutting backing paper.

In many manual labeling products, it is very common that the die-cutting backing paper is cut through, which is mainly due to the precision limitation of the customer's die-cutting equipment and the tension-free requirements of the labeling method for the backing paper; If it is automatic labeling, die-cutting the backing paper will often lead to the end user's label backing paper breaking during automatic labeling. Therefore, it is necessary to choose a hob die-cutting method with higher die-cutting accuracy.

Fourth, other matters needing attention

1. Don't die-cut the film with a die cutter. Because the blade has worn after die-cutting the paper.

2. In the process of die-cutting, use a special marker or marker to check the quality of die-cutting, and don't just observe with your eyes.

3. When die-cutting PET materials, be sure to use a die-cutting knife with sharp blade and hardness treatment.

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