Aluminum plating film with white dots on the cause and the solution - — Food packaging manufacturer

Aluminum plating film after the compound, sometimes have apparent white spots on the appearance, and the white spots can be random distribution, uneven size. The white spots brought great trouble to the printing work, the effect of the printed, let's to analyze the phenomenon of aluminum plating film white spots and some common solutions. Reason: 1, the ink particle size distribution is not wide, generally affected by the size of white ink. Ethyl ester in the adhesive is good solvent ink, ink particles of different size infiltration results, by heating the chromaticity of compound or oven to dry after a change will produce differences, will look to produce 'white'. Generally such a case, the machine is apparent, phenomenon of white dot will reduce after curing, may disappear. In printing, it is best to join the coupling agent, fillers in the ink system tightness of ascension, to resist in the adhesive system solvent leaching embellish, damage caused by the large areas of white dots or spots. 2, high adhesive surface tension, in aluminum foil roll membrane infiltrate spreading effect is poor. This is the aluminum plating film 'white dot phenomenon', also is the main reason for the other spots on composite membrane. Adhesive coating effect is not good, after printing layer, will make the change on different parts of the colour and lustre, in front of the same effect, sometimes will produce a lot of spots. 3, equipment, process. This reason is workers don't realize the particularity of composite plating aluminum film, aluminum plating film composite has his unique place, on the other hand on both sides of the equipment in the sizing process pressure, even on the system itself, such as drying, coating cannot be guaranteed fully evenly coated adhesive or there is no guarantee that ethyl ester fully evaporate. There are other reasons, such as full bottom printing network cable roller checker too shallow, reduce the ink covering power, etc. Solved methods: 1, the different batch of ink to increase fineness detection index, strict control, especially the full bottom size and fineness of ink varieties are outside the scope of the standard is not used. 2, aluminum plating film use special adhesive. Aluminum plating film compound special adhesive with low surface tension, the aluminized layer coated on the surface of the spreading effect is better than general adhesive. Adopt aluminum plating film agglutination adhesive solution is easy to control the flow of flat, have the ideal state of coating. Single tell from the state of adhesive coating, the aluminium coated adhesive can eliminate the phenomenon of the white dots. 3, viscosity of adhesive solution and the network cable roller line number has certain matching relationship, too much beyond the match interval can destroy the adhesive coating status, 'white' and other more serious fault. 4, aluminum plating film correct way of glue. Usually is the printing film coating, coating process used here, the use of special coating method avoids the ethyl ester of the ink layer infiltration inequality problem, but the process has its limitations. First of all, before to produce scraper, coating roll and roll flattening thoroughly clean; Secondly, for the old type of homebred dry reply the, machine normal speed slower speed ratio, to ensure that the drying effect.