The main purpose of vacuum aluminum-plated film is to replace pure aluminum foil compound, so that flexible packaging printed matter has an elegant silver-white gloss, and improve the barrier and light-shielding properties of flexible packaging film bags, while reducing packaging and printing costs (aluminum coating instrument is 0.4 ~ 0.6μm, only 1/150 of pure aluminum foil) 25%. There are two general methods of vacuum aluminum plating: one is vacuum aluminum plating after printing, that is, reverse reverse printing on the surface of the film, then aluminum plating, and then compounded with the base film; the second is directly on the surface of the film After lithography, dry composite with vacuum aluminized base film. However, this method must use CPP, PE and other materials with good heat resistance and heat sealing. No matter what method is adopted, the packaged and printed products after compounding can be provided as finished products without peeling and degumming. With the continuous expansion of the product, the requirements for packaging and printing quality and delivery time are also constantly increasing, while the selling price is gradually falling. For packaging and printing companies, under the premise of on-time delivery, the lowest cost of raw materials should be selected as the top priority as much as possible. For example, when using inks and glues, it is better to purchase low-cost auxiliary materials that are not profitable after use. Therefore, almost no one checks and accepts the purchase channel, which obviously leads to the inferiority of the packaging and printing products of aluminized film and one of the failures of scrapping is peeling off the glue and peeling. Around this problem, the author introduces the causes and treatment methods of the following faults in order to discuss with colleagues in packaging and printing. For example, PET film, printing ink, vacuum aluminum plating, glue coating and PE (as a heat-sealing base film material) are compounded. As a result, after the color ink is printed, the full white ink (or yellow ink) printed last is all bonded to the adhesive, resulting in Separation of PET from the base film (peeling): There is also a case where the printing ink film layer is thin, and the adhesion fastness is good after the PE film is combined with the base film, and the adhesion (bad) of the ink film layer is poor. In response to the above failures, the former involves a low softening point of the oiler (not heat-resistant), but it has a good affinity with the adhesive (miscibility), and the PET film is easily peeled off when the compound is good; the latter is due to ink The content of cotton liquid in the system is too high or the surface dispersant and waxy additives are increased. When it is compounded with the PE film, it will repel and cause poor adhesion and easy to tear. In the usual packaging and printing process, in order to save ink expenditure, color inks often use lower-priced surface printing gravure inks. Such as polyamide ink, acrylic ink, nitro ink, chlorinated vinegar resin ink, etc. can almost be used as surface printing ink of polyurethane adhesive dry compound printing, while white ink is used inside printing ink, and some all use surface printing ink` or color ink Ink ink is used, while white ink is printed with surface ink. No matter what kind of ink is used for printing, it must be clear that to prevent some inks from repelling with the compound glue, it is necessary to select the ink compound glue to have a certain compatibility. For example, polyamide ink, when using white polyamide ink as the printing ink to print the base color, as long as it has a certain adhesion with the composite ink or composite adhesive layer, the above failures will generally not occur. However, most surface inks have no affinity with the composite ink or the composite adhesive layer, so it is difficult to produce cohesive force. Therefore, this ink and the composite color ink (reverse printing) graphic ink film layer will be separated. In addition, in the production of white ink, the amount of colorant-titanium dioxide or a small amount of calcium powder in this system is mostly between 20% and 33%, while the amount of colorant in color ink is 8% to 12%, which is relatively poor Many, if we use the same amount of resin binder, for color inks, the adhesion will be greatly reduced. For this reason, when using white inks, those with a large amount of resin binders or no surfactant additives should be selected, so that the adhesion of color inks is as large as the fastness of adhesion. The author has introduced the packaging and printing method of aluminum-plated film and the principle of selecting ink and bonding compound. But this does not mean that only white ink with a large content of resin binder can have sufficient compound adhesion fastness. The surface ink dispersant and anti-settling, friction-resistant wax in the ink system are also affected by the adhesion strength of the white ink. Materials and the static electricity of the ink itself. We know that once the glue is coated on the surface of the white base ink film containing the surface-active dispersant or the anti-settling, friction-resistant wax additives, the two objects will repel, or the wax with almost no tension will make the printing The glue layer on the surface of the product forms uniform dots, which leads to the production of low-quality packaging and printing products with poor compound fastness or low compound strength. Secondly, due to the use of packaging printing inks with a low softening point, the ink is easily pulled over by a glue with a high softening point or a good miscibility (solubility) when aluminum plating or compounding is carried out in a high temperature environment. Cause the occurrence of peeling failure. Third, because the printing ink in the surface printing ink system has a large amount of hard resin content (such as the nitrocellulose auxiliary resin in the polyamide ink system), the graphic ink film glue of the packaging printing ink will often lose a certain amount. Flexible, as a result, where the ink film is thin, the adhesion is good, and where the ink film is thick, the adhesion is poor. Fourth, it is also a reason that the adhesion of the ink and the glue is not good, and the solvent residue of the ink system or the glue system is too large. The poor adhesion of the ink to the substrate is caused by low surface tension of the substrate or imbalance of the volatile gradient of the solvent in the ink system or too low viscosity of the ink (too little resin content). As for the adhesive that does not adhere to the composite base film after printing, it is caused by the substrate not being processed or the ammonia bond value of the glue is too different from the ammonia bond value of the substrate. The methods to deal with the above faults are generally: ①Handle the substrate well; ②Replace the glue; ③Use inks that have affinity with the glue; ④Change to inks with high resin content or high viscosity; ⑤Adopt stable temperature (heat) Inks; ⑥Select printing inks that do not contain surfactants or waxes; ⑦ Gravure printing is replaced with shallow mesh printing plates; ⑧ Replace the glue with high viscosity or large coating amount; ⑨Control the aluminum plating and drying tunnel 〠Compound temperature; ⑩Increase the printing pressure or the pressure between the rollers. Napkin Paper,Serviette Napkin,Bathroom Tissue Paper,Premier Tissue Paper DONGGUAN YEE HUP TRADING CO,.LTD , https://www.yeehupacks.com