Abstract : The composition and quality performance of the gravure ink of the gravure aluminum foil are expounded, and the future development trend of gravure aluminum foil label ink is discussed.
Keywords: gravure aluminum foil, ink, high light, transparent, volatile drying, die cutting
The gravure aluminum foil label ink is bright and transparent, and the printed product has an original natural metal texture. The brightness and eye-catching property are higher than any other substrate, just like the exquisite jewelry in the crown, which is in perfect harmony with the abdomen and back. Together created the perfect brand beer and thrived in beer trademark printing. The gravure aluminum foil label ink is not only used in the beer trademark, but also can be widely used in the printing of candy packaging and other food packaging.
The gravure aluminum foil beer mark, also known as the cap mark, is characterized by its ease of processing, good printability and conformability, and it does not affect printing and labeling compared to paper labels because of the wire flow. Below is a discussion on the intaglio foil label inks (hereinafter referred to as aluminum foil inks) that are closely related to them. Aluminum foil inks are basically composed of four major components, namely pigments (dye) accounting for 5-25% and advanced synthetic resins for 12-30%. Solvents account for 20-60%, auxiliary materials 1-5%. Divided by purpose, aluminum foil ink can be divided into white ink, varnish (including diluting agent), gold transfer oil, gold ink and yellow, red, blue, and other color inks: According to the type of solvent, aluminum foil ink can be divided into solvent type and water-soluble Two major categories. The water-soluble aluminum foil ink has high gloss and is safe from fire hazards. It is also more environmentally friendly. However, the drying speed and the water resistance and the softness are not as good as those of the solvent type aluminum foil ink, and the solvent type aluminum foil ink can effectively solve the above three disadvantages. White ink, varnish (including diluting agent) and color ink are generally produced by using nitrocellulose resin and some modified resins, some are modified by polyamide resin, and some are modified by aldehyde and ketone resin, rosin resin, polyurethane, etc. produce. The general diluting agent contains a nitrocellulose resin, so that the copper gold powder and the copper zinc powder react with it, causing ink thickening, a decrease in the adhesion fastness, and discoloration of the gold powder. Therefore, an acrylic resin is generally used as the gold oleoresin.
Aluminum foil ink has high transparency, dazzling color, strong adhesion, water resistance, abrasion resistance and rubbing resistance. It can react chemically (dissolve) quickly with sodium hydroxide, and has good die cutting performance. This is also the main difference with other solvent inks. . According to the different resins used above, the requirements for dilution solvents are also different. Some recommended alcohol and fat mixed solvents; some containing toluene, such as toluene, ethyl acetate, isopropyl alcohol mixed in proportion (commonly known as three-in-one), mainly because of the low surface tension of toluene, printing is good; on the other hand ink The toluene-modified resin is added, which effectively improves the gloss and transparency of the ink, makes it colorful and gorgeous, and has a full-colored layer. In the benzene-soluble gold-saturated oil, toluene can completely dissolve the copper powder (or gold bar) to ensure that the printed product achieves a strong metal feel, no background color, and full color. Polishing oils (including diluting agents) are generally recommended to have the same solvent as color inks. Water-soluble aluminum foil inks are generally diluted with water or a mixture of water and alcohol. Generally, the water content is not less than 50%. The purpose of adding alcohol is to reduce bubbles and speed up drying.
In view of the increasing use of high-speed labeling machines by beer manufacturers (eg, 40,000 bottles per hour), and the requirement for labelling to be straight, flat, and aligned with no marks, wrinkles and breakages, and no glue marks, the printing process The requirements are relatively high. When printing a large area (in the field) layout, a dilute solvent with a faster volatilization rate is generally used. When a small area or a shallow screen is printed, a slow-drying thinner is added, and the hardness of the imprinting roller is smaller (relatively In the case of printed plastic film), the printing equipment requires the installation of a cold air and hot air circulation device, the drying temperature is controlled at 50-80°C, and the printing speed is generally 90-200 m/min, ensuring that the aluminum foil ink is completely dried, thereby increasing the standard of the sprinkler standard. Cut performance. It is true that the above process parameters can be flexibly and appropriately adjusted when the ink layer can be completely dried and full-color printed quality is maintained.
Nowadays, the development trend of aluminum foil inks is mainly in the direction of environmental protection. Since toluene has a certain degree of harm to human health, certain high-boiling esters and alcohols are difficult to evaporate. Therefore, major printing manufacturers pay more and more attention to environmental protection aluminum foils. The use of ink. In response to environmental protection requirements, non-benzene-based aluminum foil inks are becoming more and more popular. For example, the SD alcohol-soluble aluminum foil inks that our company launched last year have gained recognition from many customers. At the same time, our company is also developing a single alcohol solvent. Type and water-soluble aluminum foil ink, I believe it will soon be introduced to the market in the future