Packaging and printing with aluminum foil (often 0.2mm ~ 0.25mm hard aluminum foil and 0.07mm ~ 0.09mm soft aluminum foil) Varnish, also known as varnish and OP protective agent. This paper focuses on and introduces the material composition, formula design and application results of five varieties of three kinds of high temperature curing, high temperature curing and light curing, which are made of domestic raw materials.
The main task of foil foil
The main task of aluminum foil varnish is to have completed all the single printing or multi-color overprint of fine packaging printing semi-finished products, and then coated with a layer of protective layer. Its purpose is to further promote the packaging of printed products surface gloss, aesthetics, acid, alkali, etc., but also to protect the printed graphic ink film. Not only increased the surface hardness of printed products, but also has a certain flexibility, but also improve the packaging printing genuine rate, enhance the high value of packaging products.
From the use of aluminum foil varnish, we already know its main task. But people in its scope of application, but only the temperature curing type of varnish for food packaging on the majority, especially in the past three years, fashionable in the beer seal (top) packaging logo is colorful. General high temperature 121 ~ 160 ℃ of the varnish for cooking the beverage tank hall, packets of cigarettes and pharmaceutical packaging.
With the national drug packaging container (material) standard to the present (June 1, 2004) implementation, the traditional test basis GB12255-90 only specifications, volatile, adhesive coating amount difference, heat sealing strength, protective layer Heat resistance and other five, began to be YBB00132002 (pharmaceutical packaging with composite film, bag general) replaced. This not only marks the packaging of our products, especially pharmaceutical packaging products with international standards, but also marks the end of the traditional glazing products. The advent of environmentally friendly aluminum foil varnish, but also marks the beginning of the new glazing products. The development of its products based on:
(4) mechanical properties; (5) heat sealing strength of composite bags (double and multi-layer); (3) barrier properties (water vapor and oxygen); (4) mechanical properties; (8) the drop performance of the bag (the total mass and drop height of the bag and the contents); (9) the test of the dissolution test: (1) the amount of the solvent, ① heavy metals; ② easy oxide; ③ non-volatile matter; (10) microbial limit (general composite film, bags; external drug composite film, bags, etc.) (11) abnormal toxicity.
Second, YBB00132002 provides (1) composite membrane refers to a variety of plastic and paper, metal or other plastic through the combination of adhesive film formed, the thickness is generally not greater than 0.25mm; (2) composite bag will be composite membrane through Heat sealing method and made of bags, according to the form of bags can be divided into three sides sealed bags, sealed bags, organ bags, self-reliance bags, zipper bags and so on. And the provisions of the composite membrane of the classification, barrier properties, mechanical properties, drop performance, microbial limit indicators, size deviation and so on. I around the environmental protection and convergence with the international market, in addition to physical measurement, but also increased the physical and chemical indicators of measurement. At the same time due to the total residual solvent in the past 30mg / m2, is now changed to 10mg / m2 and benzene residue limit of 3.0mg / m2. Combined with the first sodium thiosulfate titration solution (0.01mol / L) titration to the near end, the addition of starch indicator solution 0.25ml, continue to titration to colorless, and the other water white liquid with the law, the difference between the two consumption of titration Over 1.5ml harsh restrictions. Plus glazing can be 180-250 ℃, 10 seconds does not change color, do not fade, do not fade, not side light (both due to heat and light, both due to softening point is too high, and caused by the conductivity) The (2) have a certain degree of brightness, firmness (4) solid high and low viscosity, high transparency, especially the flow of smooth and smooth, Good quality; (5) after the film after the film resistance to die-cutting, not to hurt the knife, and resistant to embossing, drilling and other mechanical impact.
The basic composition of foil
Environmentally friendly aluminum foil packaging Varnish on the basic composition is: resin, solvents, fillers, additives. At present, the system of high temperature (120-160 ℃) aluminum foil varnish system is the use of thermoplastic resin, and then add a small amount of thermosetting resin or amphoteric resin, but resistant to High temperature (180-250 ℃) aluminum foil packaging system in the system under the thermosetting resin and both amphoteric resin. The choice of resin is: acrylic resin, nitrocellulose, polyamide resin, natural rosin modified resin, phenolic resin, silicone resin, polyketone resin, amino resin and so on. The solvent ratio of alcohol, ester, ketone-based, benzene auxiliary. Auxiliaries are leveling agents, slip agents and trace amounts of light stabilizers and heat stabilizers.