How to deal with bubbles that appear during the use of A4 stickers?

During the use of A4 adhesive, bubbles may appear, which can be treated through the following methods:

1、 Reasons and preventive measures for bubble formation

Environmental factors:

Temperature and humidity: Excessive or insufficient environmental temperature and humidity may affect the adhesion of the adhesive. For example, in low-temperature environments, the fluidity of glue deteriorates and it cannot fully adhere to the surface of the object being pasted; Water vapor in high humidity environments can easily cause glue to become damp and lose its stickiness.

Solution: Control the temperature of the labeling environment between 18 ℃ -25 ℃ and the humidity between 40% -60%, and use devices such as dehumidifiers or humidifiers to adjust the environmental humidity.

Surface condition of the sticker:

Oil stains and dust: Impurities such as oil stains and dust on the surface of the sticker can hinder sufficient contact between the label and the sticker surface.

Solution: Before pasting the label, use a suitable cleaning agent and wiping cloth to clean the surface of the object being pasted.

Labeling machine pressure:

Improper pressure: Insufficient or uneven pressure from the pressure roller of the labeling machine may result in gaps between the label and the object being labeled.

Solution: Apply appropriate pressure to ensure that the label receives uniform pressure.

Labeling speed:

Speed too fast: The label does not have enough time to adhere to the surface of the object being pasted, and the air cannot be expelled in time.

Solution: Adjust the labeling speed reasonably based on the size of the label, the characteristics of the adhesive, and the situation of the object being labeled.

Static electricity effect:

Static electricity generation: Static electricity is generated when the weather is dry or when there is friction between the adhesive label and the object being pasted.

Solution: Control the humidity of the labeling environment and use a humidifier to increase the humidity; Install copper wire above the labeling machine and ground it to reduce static electricity.

2、 Bubble removal methods

Water washing method:

Soak the adhesive sticker in warm water for about 5 minutes, allowing the water to seep through the sticker.

Take out the sticker and shake it slightly to disperse the moisture.

Stick the sticker on the desired position, use a scraper to smooth the surface of the sticker, and squeeze out the bubbles.

Hair dryer hot air method (suitable for small area bubbles):

Use a hair dryer to blow hot air onto the bubble area, while pressing the part next to the bubble with your fingers.

When the bubble expands to its maximum, release your fingers and let the bubble naturally squeeze out and disappear.

Re attach method:

If there are large or numerous bubbles, you can consider removing the adhesive label, cleaning the surface of the object to be attached, and reattaching it.

3、 Precautions

When dealing with bubbles, try to avoid damaging the adhesive label and the surface of the object being pasted.

When using the above methods, appropriate methods should be selected based on the actual situation for processing.

To prevent the generation of bubbles, sufficient preparation work should be done before labeling, including cleaning the surface of the object to be labeled, adjusting the labeling environment, etc.

In summary, the occurrence of bubbles during the use of A4 stickers can be addressed through preventive measures and removal methods. Preventive measures include controlling environmental factors, cleaning the surface of the sticker, adjusting the pressure and speed of the labeling machine, and reducing static electricity; The removal methods include water washing, hair dryer hot air method, and reattachment method. In practical operation, appropriate methods should be selected according to the specific situation for handling.