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2024-04-13 08:07:08
PE printing film shrink film shrink film shrink film
The aluminum foil composite film produces distinct white or gray spots during processing. These spots are most common during the full-page ink printing compounding process. The main reasons are threefold:
1. The quality of the aluminum foil composite film itself is poor, the plating layer is easily peeled off, the aluminized film is coated, and the rolled film is not flat. In particular, when the adhesive is applied, the flow is uneven, and after the compounding, white spots which are dense or confusing are more likely to occur. The adhesion of inks and adhesives on the surface is different. The adhesion between the ink layer and the coating at the spots is low (spots caused by uneven dispersion of ink or adhesive) make the interlayer tightness; The plating has been obviously transferred, and the tightness between the layers is good. The intensity of reflection by the aluminized layer forms white spots or gray spots, and the degree of the spots is largely related to the ink hiding power and the amount of sizing, especially the rubber leveling property. The hiding power is good, the spots are shallow; the rubber leveling is good and the coating is uniform, and the white spots are less. On the contrary, there are many spots and the white spots are serious.
2. The quality of the adhesive is poor. The adhesive has a poor affinity for the aluminized layer, especially the uneven adhesive in the OPP printing film and the BOPP printing film and the aluminum foil composite film, and the adhesive performance is more obvious. Mainly because of the high surface tension of the adhesive, poor coating performance, uneven coating of glue, causing "spot" phenomenon. At the same time, the glue generally has a high initial tack force and poor solvent release property, and the strength is not as good as the initial tackiness due to the residual solvent after the ripening. After the printing film is combined, the ink layer is wetted by the residual solvent, and speckle may occur. This phenomenon is more pronounced when such adhesives are used at high speeds on 150 rolls or more. If the adhesive coating cannot be slightly soluble with the ink film of the printing ink, no white spots are visible on the surface, but the adhesion of the adhesive layer to the ink layer and even the printing film layer after the composite process cannot meet the actual requirements of the packaged product. Very easy to peel off.
3. The aluminum foil composite film itself has poor tightness and poor hiding power. After the printing film is applied, the ink layer is infiltrated by the acetic acid in the binder, and partially dissolved. After the composite, the ink layer and the rubber layer are easily infiltrated and destroyed by the solvent of the adhesive system, resulting in different shades, resulting in color difference. , the formation of so-called spots.
Hebei Deyi Company specializes in the production of food, daily chemical and electronic packaging products. All kinds of specifications can be customized, excellent quality, factory direct sales, website online consultation, http://hbdmbz.com/hotline 13363187250
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