What are the causes of bubbles in pressure sensitive adhesives?

1. The temperature of the glue tank is too high

If the temperature is too high and the heat resistance of the pressure-sensitive adhesive is not good, this phenomenon may occur;

2. The problem of pressure sensitive adhesive itself

Pressure-sensitive adhesives are not completely melt-mixed during the production process, and the air in the rubber will be released during the heating process, resulting in bubbles. Or the pressure-sensitive adhesive is not vacuumed or vacuumed not completely during the production process;

3. There are bubbles in the nozzle of the gun

You can check whether the temperature of the pressure-sensitive adhesive machine is set too high, and whether there is residual glue that is not completely discharged. You can try to remove the glue for a few minutes, and use it after emptying the residual glue in the hose;

4. There are no bubbles in the glue from the gun nozzle, and there are bubbles after bonding

Possibility that the pressure was not positioned in time after gluing, so it bounced off during initial gluing, creating air bubbles at the edges or ends.

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