Once the composite membrane spot problems, from the seven improvements!

Composite membrane surface can sometimes produce white or gray spots, this kind of situation in the full version of the printing ink and composite aluminum plating film to in production process, the main reason has the following several aspects. 1, the lower the surface tension of the ink, resulting in poor performance of the adhesive coating, glue, so the bond force between ink and aluminized layer and layer can produce different intensity, and thereby aluminized layer surface reflective effect also has the strength, forming white or gray spots on the vision. 2, printing ink, covering power is not strong or stay flat is poorer, causing uneven cover ( Especially the white ink and light yellow ink) Where the cover effect is not good, the color of the aluminized layer through the ink penetration. 3 concentration is too high, adhesives, viscosity is too large, easy to ink stick to glue solution, make the change the color of the printing layer. At the same time, the adhesive viscosity if it is too big, liquidity is poor, easy to cause the gluing quantity is uneven, influence on the performance of the aluminized layer surface reflective, spots. 4 don't match, inks and adhesives, makes the adhesive on the ink penetration performance is bad, rejection, also can produce spots. 5, composite membrane is not completely drying, solvent evaporation is not sufficient, cause in the adhesive solvent residue is overmuch, part of the ink is dissolved, thus forming spots, serious when also can form many tiny bubbles after curing. 6, aluminum plating film itself quality is poorer, more pervious to light point, after composite repair rate is different, because of the aluminized layer formation of spots. 7, bake, ( Especially the primary drying tunnel) Gel temperature is too high, resulting in surface liquid dry too fast, conjunctival surface; As the internal solvent in secondary and tertiary bake, gasification occurs, will break through the surface of the film, crowded up glue adhesion agent, printing ink, rubber thickness caused by uneven, resulting in a spot.