How to solve the white spots and disappearance of aluminum coating film adhesive?
- 2019-04-29-

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; How to solve the white spots and disappearance of aluminum coating film adhesive?

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Prevent white spots on the composite film of aluminized film adhesive

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 1. Choose a better quality ink to ensure that the adhesive is evenly coated and the ink layer can be evenly coated with residual solvent infiltration

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 2. Choose an adhesive that has good coating properties for the inks and aluminum coatings used.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 3. For light colors, especially white areas, the amount of glue should be increased.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 4. Adopt the compound method of coating with aluminum coating, but it will aggravate the transfer of aluminum coating.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 1. Prevent tunneling

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 1, coordinate and control the tension of the main and auxiliary unwinding and drying tunnel, so that each of the aluminized film adhesive composite film The layer retracts synchronously after cooling and solidification.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 2, increase the drying temperature and air speed of the drying tunnel to increase the initial viscosity.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 3, apply glue evenly to prevent local tunneling.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 4, apply an appropriate amount of glue to prevent slippage when excessive or insufficient amount of glue occurs, resulting in tunnels.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 5. The product after compounding should be as natural as possible or placed at low temperature for a period of time before compounding twice. 0010010 nbsp;

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Second, prevent the disappearance of aluminum plating

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; It is not uncommon for aluminized film adhesive to disappear after aluminizing. Some products have a large area in the middle aluminized layer after being left for a period Piebald, and some products have almost disappeared after being boiled and become transparent windows. 0010010 nbsp;

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Cause: The pure aluminum adsorbed on the surface of PET after vacuum deposition, it will be oxidized when exposed to the air, and it will also be oxidized when wet .

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; When aluminum exists as a monomer, the surface will be covered with a layer of aluminum oxide. Although aluminum is a more active metal, it is more difficult for aluminum to react with water. The reason is that one of the products that react with water is the insoluble AI (OH) 3 , (under heating, aluminum hydroxide will also be converted into alumina), the insoluble aluminum hydroxide (alumina) Becoming a film covering the surface of aluminum will prevent aluminum from further reacting with water. The reaction will increase when heated or (and) in the presence of other media (such as CI-ions). The micro magnetic field formed between aluminum and water may also contribute to its reaction. Due to the large number of substances in contact, aluminum complexes may also be formed.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; The solution to the white spots and disappearance of aluminum coating film is introduced here, and I hope to help you.