"If there are small bubbles in the complex, opaque and foggy, it will not only affect the appearance quality, but also affect the peeling strength of the complex, reducing it, which is a very bad phenomenon."

1.The surface tension of the base film is too small, the infiltration is poor, the glue is not uniform, and the space without glue is empty and bubbles are generated.

The solution is to use a film with a surface tension greater than 38mN/m, or re-corona treatment, or online corona treatment, qualified for reuse.

2.The pressure of the composite roller is insufficient, or the surface temperature of the composite steel roller is too low, the activation of the adhesive is insufficient, the fluidity is insufficient, the micelles of the same dot are uneven, and there are small gaps, resulting in very small bubbles.

At this time, the surface temperature of the composite steel roller should be increased, and the pressure should be increased. It is best to smooth the rubber particles with an inverted rubber roller before applying the adhesive base film into the baking channel.

3.The Angle between the composite roll and the film is not appropriate, the envelope Angle is too large, especially for rigid materials, easy to cause folds and even bubbles.

The Angle should be carefully adjusted, the wrapping Angle should be changed, and the composite roller should be entered as far as possible according to the tangential direction.

4.There is dust attached to the surface of the film, the dust particles will be two layers of film up, forming a circle around the empty ring is a little bit of air bubble, look carefully in the middle of a black spot.

If there is such a phenomenon, should pay attention to the environment clean, keep the air fresh.

5.There is a trace of water mixed in the adhesive, and an NCO in the adhesive reacts with water to produce CO2 gas.

Therefore, it is necessary to keep dry on solvents and environmental humidity to eliminate the cause of CO2 production.

6, residual solvent, and the permeability of the solvent is poor, the solvent gasification to form bubbles sandwiched between the two layers of film.

Therefore, the amount of residual solvent should be controlled, or the base film with a large solvent transmittance should be decompounded.

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