[China Aluminum Network] In addition to aluminum foil used for baking can also be used to do? Aluminum foil can also be used for printing. So when faced with aluminum foil in printing, how should it be prepressed? The 2010-2015 China Aluminum Foil Industry Market Depth Evaluation and Investment Planning Research Report will tell you.
Aluminum Foil Printing The surface-treated aluminum foil is placed in the air and a very thin, dense oxide layer is immediately formed on the surface. If the oxide layer is not contaminated, the ink has good adhesion. However, the actual production of aluminum foil is contaminated by lubricants, environmental dust, etc., forming a very thin film layer that affects the adhesion properties of the ink. Therefore, aluminum foils for printing must be treated with a pre-printing etching coating to eliminate the contamination of lubricants and enhance the adhesion of the ink to the foil surface.
The etching coating treatment of aluminum foil paper, also called bottom surface treatment, is the use of shellac coating or nitrocellulose coating to coat the surface of aluminum foil. After coating, the printing surface is no longer aluminium foil but coating material. These coating materials have a good affinity with the ink, thereby improving the adhesion of the ink to the foil surface.
Aluminum Foil Printing Paper Pretreatment Aluminium Foil is a composite material of aluminum and paper. When the temperature or humidity of the work or use environment changes so rapidly that it does not reach the internal balance, the internal stress caused by the two-layer structure of the inner coating or the adhesive will not only Will cause expansion or contraction, but also because of the change in moisture content, but also make the paper local size changes, the formation of curls, wrinkles, waves and even longer deformation, seriously affecting the quality of printing and post-processing. Therefore, in order to ensure the normal printing of aluminum foil, we must control the temperature and humidity of the printing shop, so that the workshop temperature is maintained at (25 + 2) Â°C, and the relative humidity is maintained at 50% ~ 60%.
The balance of temperature and humidity before printing and its importance are important. If the temperature and humidity do not reach equilibrium, static electricity will be generated, making it difficult to transport paper. In actual production, the original packaging of aluminum foil should be placed in the workshop for at least 16 hours to open the cut white material and print it after 8-12 hours. In addition, in addition to drying using a paper holder, the printed product should also cover the plastic film during the processing period to prevent moisture or reduce the telescopic deformation.
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