Introduction to aluminized composite membrane of delamination phenomenon

Aluminized composite membrane delamination phenomenon has long been plagued by packaging enterprise, one of which is the most ink layer delaminating, this is because the composite products after curing, ink layer most transfers aluminized surface, cause the peel strength is poor. The phenomenon mostly appear on the printed PET film, OPP film printing on the probability is relatively small. Factors has the following several aspects: 1, OPP film printing this happens mostly related to the type of polyamide ink, as long as the use of chlorinated polypropylene ink, this phenomenon will solve; Other OPP degree of surface treatment can also lead to this phenomenon. 2, PET printing film appear all sorts of things have three factors: a, and the use of chlorinated polypropylene ink has a certain relationship. Solution is to a large quantity of ink printing ink on the use of polyester, nylon special ink, the ink volume can continue to use less chlorinated polypropylene ink can solve. B, related to the residual solvent effect. As long as the lower solvent residue, transfer phenomena will reduce. C, associated with PET film product quality. Some PET film, surface treatment is very good, one side can reach 45 dyne, printing surface can reach 50 dyne, on the surface quality is very good, if choose polyester, nylon special ink, in actual printing, the printing surface printing fastness than 45 dyne printed in the surface. After a composite printing in the printing surface transfer instead, and printing in instead of negative transfer. The main reason lies in the membrane manufacturers too pursuit of thin film surface treatment, in the production processing film, the film corona treatment, has damaging effects on the membrane surface. The other is aluminum plating film composite bags peel strength is poorer, exists the phenomenon of OPP / / VMCPP and OPP/VMPET /. Just compound stripping is better at the beginning of a good product but peel strength after curing down instead, unable to meet the standard requirements, this phenomenon can be detected directly in the bag. Specific performance in aluminized layer no & other; The migration & throughout; , printing ink, also not be left behind. Produce this kind of phenomenon, there are two factors: 1, the influence of ink mainly use the table to print the modification of polyamide type of ink, the type of ink and polyurethane glue intermiscibility poor ( Combined with poor fastness) 。 2, about the quality of the aluminum plating film itself, poor quality of aluminum plating film is easy to appear the quality problem. And the other a delamination phenomenon appear less, often goes unnoticed and aluminum plating film composite delamination phenomenon, once appear, often loss is bigger. Mainly in BOPP printing / / WM - PET, composite processing viscous force is quite good at the beginning of the last two peel strength after curing is better also, but after a week or ten days to show it. Appear this kind of phenomenon also is aluminized layer no & other; The migration & throughout; , printing ink, also not be left behind, but after the loss is more serious, when packing bag packaging items after the loss of more. Appear this kind of phenomenon is the main reason of the residual solvents in the ink layer destroyed the adhesive bonding effect, specific analysis is as follows; One, to the delamination of product performance analysis, delamination phenomenon appear in the part of the ink layer thick, thin layer of ink place is not obvious, single white ink printing not abscission layer. Second, the manufacturers use ink ( The color) Diluent formula, equipped with isopropyl alcohol and butanol. And the solvent ink formula, mostly in polyamide modified composite inks, alcohol solvent is true solvent, this 2 kinds of alcohol residue extremely easily, alcohol damage to the adhesive plays a role. And most of the white ink are polypropylene oxide composite inks, there is no this phenomenon. Three, light color area is to eat less ink, residual solvents are relatively small, the phenomenon also is not obvious. Four, the use of adhesives are often some of the rigid polyurethane adhesive or fast curing polyurethane adhesive, rigid product is bigger, brittleness is bigger also, when the residual solvents is large damage to adhesive effect is best. And after plating aluminum special adhesive curing ink still has certain viscosity, molecular chain is soft, residual solvent is more effect on it is not very big. Fifth, appear this kind of phenomenon is often when the environment humidity is higher, humidity is bigger, the more relative retention of residual solvents. Through analysis, appear this kind of phenomenon is often associated with ink, adhesive, the environment, so as far as possible on the choice of ink using chlorinated polypropylene composite inks, and do not recommend using modified polyamide composite inks. Environmental humidity is bigger when printing, try not to print. As far as possible when choosing adhesives used to compare the soft glue or aluminium coated ink special adhesive, and also can decrease the dosage of curing agent. As long as to do more than the phenomenon will avoid. In practical production, to solve the peel strength difference phenomenon is various, first of all to ensure that the selected compound base material quality. To ensure the quality of dilution solvent. Another is to choose suitable adhesive and choose the appropriate printing ink. Second production process conditions, such as drying temperature and air flow temperature and pressure, tension control, composite roller and so on factors, is also must pay attention.