How to solve the bubble problem when PET silver paper is coated?

To solve the bubble problem of PET silver paper in the film coating, you can start from many aspects. Here are some specific solutions:

First, check and optimize the printing process

1.Ensure the printing ink layer is dry:

If the printing ink layer is not dry, it is easy to produce bubbles when the film is coated. Therefore, ensure that the printing ink layer is fully dry before coating. The drying process can be accelerated by delaying the coating date or using methods such as hot pressing.

2.Adjust the printing ink layer thickness:

Printing ink layers that are too thick also increase the risk of bubbles. Where possible, the appropriate reduction in the thickness of the printing ink layer helps to reduce the generation of bubbles.

Second, adjust the film coating process parameters

1.Control the temperature of the composite roll:

The high surface temperature of the composite roller may cause the adhesive surface to crust, thus causing bubbles. The temperature of the composite roller should be properly reduced, and heat dissipation measures such as air cooling or closing the electric heating wire can be taken.

2.Adjust the film drying temperature:

Coating drying temperature is too high will also cause the adhesive surface crust and produce bubbles. The drying temperature should be properly reduced to ensure that the adhesive will not cure too quickly during the drying process.

Third, check and replace materials

1.Check the quality of PET silver paper:

The quality problems of the PET paper itself (such as uneven surface, wrinkles or relaxation) may also lead to the production of bubbles. The quality of PET silver paper should be carefully checked, and qualified paper should be replaced if necessary.

2.Check the adhesive quality:

Excessive adhesive concentration, excessive viscosity or uneven coating may also cause bubbles. The quality of the adhesive should be ensured to meet the requirements and the adhesive should be properly diluted to reduce the concentration and viscosity.

Fourth, optimize equipment status

1.Check the press roll status:

Aging of the roll or uneven surface may cause the film to not be tightly fitted to the PET silver paper during laminating, resulting in bubbles. The status of the roll should be checked regularly and the aging roll should be replaced in time.

2.Adjust the pressure roll:

Too little pressure of the pressure roller may also lead to the formation of bubbles. The pressure of the pressure roller should be appropriately increased to ensure that the film and PET silver paper can be closely fitted during the film laminating process.

Fifth, improve the operating environment

Maintain a clean environment:

The fitting operation should be carried out in an environment with less dust to prevent dust from entering the fitting surface to form bubbles.

Sixth, post-processing measures

Bubble removal:

For bubbles that have already been created, you can try to use a bank card or other flat card to gently push from the edge of the bubble to remove the bubble. If the bubble is large or difficult to remove, it may be necessary to tear off the film.

In summary, to solve the bubble problem of PET silver paper in the coating process, we need to start from many aspects, including checking and optimizing the printing process, adjusting the coating process parameters, checking and replacing materials, optimizing the equipment status, improving the operating environment and taking post-treatment measures. Through the comprehensive application of these measures, the generation of bubbles can be effectively reduced and the quality of the film can be improved.