Further to be used in household cooking, the commercial aluminium foil is extra frequently utilized in meals packaging, the primary degree of which entails printing. Then a way to print it? And what are matters well worth interest?
Floor cleaning
At the same time as being located inside the air, the economic aluminum foil might without delay reacts to the oxygen and a totally skinny layer of dense oxide could be fashioned at the surface right away. If the oxide layer isn't always grimy, the ink has good adhesion. But, in actual manufacturing, the aluminum foil paper is infected through lubricants and environmental dirt, and a very thin film layer is shaped to have an effect on the adhesion properties of the ink. Consequently, a surface cleaning technique is inevitable earlier than printing aluminum foil. This is called a pre-press etching coating remedy, aimed to eliminate the dirt of the lubricant and enhance the adhesion between the ink and the foil floor. Additionally called the bottom floor treatment, that is is to coat the floor of the aluminum foil paper with a shellac coating or a nitrocellulose coating. After coating, the printing floor is not an aluminium foil however a coating fabric. Those coating materials have correct affinity with the ink, thereby enhancing the adhesion of the ink to the foil surface.
Pretreatment earlier than printing
Primarily based on the information above, we will see that aluminum foil for packaging is virtually a composite cloth of aluminum and paint coating. In case of dramatic changes of the temperature and humidity of the similarly processing environment, it's tough for the inner environment gets balanced with the outer environment, the double-layer shape connected by the internal coating or the adhesive will generate internal pressure, so that it will not best cause form changes however additionally form curls, wrinkles and waves due to the change of water content material, which seriously impacts the quality of printing and submit-processing. Therefore, with a view to ensure the normal printing of aluminium foil for packaging, it's miles vital to manipulate the temperature and humidity of the printing workshop, in order that the temperature of the workshop is maintained at (25 + 2) ° C, and the relative humidity is maintained at 50% to 60%.
The temperature and humidity balance before printing processing is essential. In any other case static energy might be generated, so that it will make foil feeding hard. In real manufacturing, the original packaging of commercial aluminum foil have to be positioned within the workshop for at least sixteen hours earlier than being opened for cutting, and every other 8-12 hours earlier than printing. Further, the printed product ought to be included with a plastic film to prevent moisture and reduce deformation at some stage in processing.