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The Main Reason For The Formation Of Spots In Lamination Film
Jun 07, 2017

Lamination Film to plastic film as impermeable substrate, and non-woven Lamination Film made of geosuction impermeable material, its impermeability depends mainly on the plastic film impermeability. At present, domestic and foreign anti-seepage application of plastic film, mainly polyvinyl chloride (PVC) and polyethylene (PE), EVA (ethylene / vinyl acetate copolymer), they are a polymer chemical flexible material, the proportion of small, Strong extension, high adaptability to deformation, corrosion resistance, low temperature resistance, good frost resistance. The main mechanism is to plastic film impermeable barrier earth dam leakage channel, with its large tensile strength and elongation to withstand water pressure and adapt to the dam deformation; and non-woven is also a polymer short fiber chemistry Material, through the needle or hot tack forming, with high tensile strength and extensibility, it is combined with the plastic film, not only increased the tensile strength of plastic film and anti-puncture ability, and because the non-woven surface rough , Which increases the friction coefficient of the contact surface, which is favorable to the stability of the composite geomembrane and the protective layer. At the same time, they have good resistance to bacteria and chemical resistance, not afraid of acid, alkali, salt erosion.

The surface of the Lamination Film sometimes appears white or gray spots, this situation in the full version of ink printing and aluminum Lamination Film production process is easy to occur, the main reasons for the following aspects.

    (1) the surface tension of the ink is low, resulting in the poor coating effect of the adhesive, the glue is not uniform, so the ink layer and the adhesion between the aluminum layer and the degree of inter-layer tightness will be different, Aluminum surface of the reflective effect is also strong and weak, in the visual formation of white or gray spots.

    (2) ink hiding power is not strong or poor leveling, resulting in uneven cover (especially white ink and light yellow ink). Where the hiding effect is not good, the color of the aluminized layer will penetrate through the ink.

    (3) adhesive concentration is too high, viscosity is too large, easy to stick to the ink sticky glue, so that the printing layer of color changes. At the same time, if the adhesive viscosity is too large, poor mobility, easy to cause uneven glue, the impact of the surface of the aluminum reflective properties, resulting in spots.

    (4) ink and adhesive does not match, making the adhesive on the ink permeability is not good, there is exclusion phenomenon, will produce spots.

    (5) dry film is not complete, solvent evaporation is not sufficient, resulting in too much solvent in the adhesive, part of the ink layer was dissolved to light, resulting in spots, serious aging will form many tiny bubbles. Related Keywords: non-woven Lamination Film

    (6) Aluminized film itself is poor quality, there are more light transmission point, after the composite due to the different reflectivity of the aluminum layer, the formation of spots.

    (7) drying Road (especially the primary bake Road) temperature is too high, resulting in surface glue dripping too fast, surface conjunctiva; when the internal solvent in the second and third bunker gasification occurs, it will break the surface of the glue Film, squeeze the adhesive, exposing the ink, causing uneven adhesive layer thickness, resulting in spots.

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