What problems should be paid attention to in the printing of aluminum foil self-adhesive labels?
The aluminum foil self-adhesive surface material is a composite material of paper and aluminum foil. Like the metal and plastic surface, the ink is dried only by oxidation, polymerization, volatilization, conjunctiva, and solidification without a permeation process. Therefore, ink drying and blocking are two prominent problems when printing. Aluminum foil paper generally has a surface coating, there is no ink fastness problem, and a reasonable solution to ink drying problem is the key to aluminum foil printing.
According to the characteristics of aluminum foil paper, the general design principles of printed graphics are:
First, it is based on simple words and symbols, fully displaying the characteristics of metallic colors, instead of metal signs, and more applications on commodities, such as household appliances and daily necessities.
Second, large-area solid printing or negative printing, instead of large-area bronzing processes, such as wine labels, industrial labels. Aluminium foil paper rarely has color-coded printing.
Silver foil paper circle label aluminum foil paper is divided into two printing methods: web and sheet.
1 web printing. Mainly in letterpress printing. Simple patterns and hand-labeled labels can be used to solve the problem of ink drying by cutting the sheets and drying them on the shelves. Large-area patterns and labels requiring automatic labeling should be printed with ink. In the absence of drying, the filming method is generally used to solve the drying problem of the ink.
2 sheetfed printing. Mainly based on offset printing, suitable for large-area, mesh printing. Due to the improper drying of the ink during continuous printing of the sheet, it is easy to cause many quality problems. To ensure normal printing and quality, the following measures should be taken:
Use aluminum foil special inks, such as aluminum foil inks from Suzhou and offset offset paper inks from Tianjin Toyo Ink.
A proper amount of desiccant is added to the ink to increase the drying speed of the ink.
Add alcohol to the dampening solution to reduce the emulsification of moisture and ink to prevent smudging.
Master the amount of paper stacking, generally a single sheet is suitable, and the rack is dried to avoid sticking due to excessive weight of the paper.
Adjust the viscosity and thickness of the ink and add additives according to the actual situation.
Keep the production environment of the printing workshop, the temperature is controlled at about 20 degrees, so that the ink is in the best condition.
The above ink processing method is also suitable for web letterpress printing.