The label lamination is wrinkled, and the first-line master will teach you to solve it quickly!

The label lamination is wrinkled, and the first-line master will teach you to solve it quickly!

Laminating refers to the plastic film coated with adhesive and the label print after heating and pressurizing to form a paper-plastic integrated label product, which is one of the most important processes in the post-press processing process and an effective means to improve the grade of label printing and commodity value. However, lamination is not as simple as imagined, if you are not careful, there will be problems, such as lamination folds, etc., in this article, the author will analyze the causes and solutions of label lamination folds in detail.

Causes

01

Environmental factors

The humidity in the workshop is too high, causing the paper to ruffle when damp, causing wrinkles during lamination; The temperature is too high during lamination, which causes the paper to have tight edges and wrinkles.

02

Material factors

In addition to the paper itself, problems such as uneven coating material, uneven coating, or material shrinkage can also lead to wrinkles during the laminating process.

03

Strength factor

Too much or too little lamination pressure, tension, and tension can cause wrinkles during the lamination process. For example, too much pressure will increase the tension of the lamination, resulting in local contraction, while too little pressure will cause the lamination to lose contact and form bubbles on the surface.

04

Rubber roller factor

The rubber roller itself is uneven, or there is dirt on the rubber roller, which is easy to cause wrinkles during the laminating process.

05

Other factors

During the lamination process, such as accidentally skewed paper feeding, or mismatched front and rear speeds, it may also lead to wrinkling of the lamination.

Solution

Method 1:

If it is a temperature problem, adjust the temperature before trying, because different laminating materials have different corresponding temperature requirements; If it is a humidity problem, it can also be humidified or dried with the corresponding equipment.

Method 2:

If it is a material problem, such as the paper is damp, replace the damp paper or dry it with a hair dryer; If it is a problem with the laminating material, replace it with a new roll of material and try it.

Method 3:

If it is a pressure, tension or tension problem, try to adjust the corresponding parameters and pay attention to some details, such as after the pressure adjustment, the wrapping direction should be correct to avoid uneven tension, and at the same time maintain a reasonable surface coating thickness, so that the surface coating is uniform and there is no local thickness difference.

Method 4:

If it is a problem with the rubber roller, first check whether there is a foreign object on the rubber roller, wipe it carefully and repeatedly several times, and keep it clean frequently; If it is a problem with the rubber roller itself, such as using it for too long or too old, it is necessary to consider smoothing it out or replacing it with a new rubber roller.

Method 5:

If none of the above problems are true, you need to consider some details, such as in addition to the skewed paper feeding and mismatched speed, it may also be that the angle of the laminating machine is wrong, resulting in the laminating material being unable to compound evenly and wrinkle during the lamination process.

Quick judgment method

For experienced masters, they will quickly find the problem according to the specific situation of the lamination folds, such as:

1. Vertical folds

Cause analysis: The film has too much tension, and it is not flattened when pressed, and there are creases on its own, so it wrinkles after the film is covered.

Solution: Relax the tension of the film, adjust the stretch roller, flatten the film and then press it.

2. Oblique folds

Cause analysis: The film has a large tension and the position of the adjustment roller is improper, resulting in the film itself being inconsistent in tightness, uneven film transfer, and regular wrinkles to the loose side.

Solution: Relax the film tension, adjust the stretch roller or temporarily replace the film.

3. Transverse folds

Cause analysis: The temperature of the heating roller is too high, the pressure of the rubber roller is too high, and the film is burned into horizontal folds when laminated.

Solution: Appropriately reduce the temperature of the roller or reduce the pressure of the rubber roller.

4. Deformation and wrinkling

Cause analysis: The temperature is too high during heating, the film is deformed and wrinkled, or the gap between the guide rollers is too small, and the film is squeezed out of the folds before it is pressed.

Solution: Reduce the temperature and adjust the clearance of the guide roller correctly.

5. Wavy edge

Cause analysis: The tightness of the two ends of the film is inconsistent or the adhesive layer is too thick, the viscosity is too large, and the paper and film slide after pressing and extrusion, resulting in wavy edges.

Solution: Replace the qualified film, adjust the amount of glue, and increase the drying temperature.