Tin boxes are often used in daily life to contain food, cosmetics, tea, tobacco and alcohol, etc., and they are used in a wide range; do you know the links that should be paid attention to in the design and printing of exquisite tin box packaging?
Two points to note in the packaging design of the tin box
1. Pay attention to the design of patterns:
First of all, three aspects should be considered in the pattern design: the structure of the tin box packaging, the materials used, the color, etc.;
Geometric patterns and physical illustrations are more commonly used; the physical illustrations are mostly cosmetics and daily necessities.
Some food tin boxes are designed with window openings, which can directly let people see the inner items directly.
In terms of expressing themes, although the way of expression is different, the purpose is very clear.
No matter which method is adopted, it has to be connected with the inner objects in order to show the vividness of the theme.
2. Pay attention to color:
More than 80% of the information in the tin box packaging design comes from vision. If the designer can use the packaging color to directly reflect a certain characteristic of the inner product, this product is likely to become the buyer's preferred product.
There are also some who dare to use color boldly to achieve better and more bizarre effects, but if you don’t master it properly, it will be counterproductive.
What should I pay attention to when printing on packaging tin boxes?
一. Internal coating (oiled)
Packaging containers made of tinplate, according to the characteristics of the contents, usually need to be coated with some kind of paint on the inner surface of the container, commonly known as gold oil or varnish, to prevent the contents from corroding the tank wall and the contents from being contaminated, which is good for long-term storage. .
For candy boxes, in order to prevent post-processing curling, iron scrapes and rust, it is also necessary to apply a layer of decorative paint to increase the appearance.
For the performance of the internal coating of food cans, it must not only have corrosion resistance, good adhesion, flexibility, non-toxic, odorless, and meet the food hygiene and safety requirements, but also must have the heating of high-frequency resistance welding in the subsequent processes, and the internal repair coating. Local high-temperature heating, and 121 ℃ high-temperature cooking after canning without fading and without losing gloss.
Phenolic resin coatings, epoxy-phenolic resin coatings, acrylic resin coatings, aluminum powder coatings, etc. are generally internally coated. The type of internal coating and coating thickness are usually selected according to the characteristics of the content.
二. Ink white (white ink) or painted white (white porcelain)
1. Print white.
has iron permeability and metal lines can be seen. Since tinplate cans are generally printed first, then cans are made, and cans need to go through processes such as bending, stretching, welding, flanging, and crimping. In addition to the dry coating and ink layers that have sufficient strength, they also Sufficient adhesion is required to avoid deformation, cracking, or even falling off of the coating film and ink layer during the processing and molding process. Since the adhesion between the ink and the tinplate is not ideal, it is necessary to A layer of paint (ie primer) is printed in between, which is a white background process to improve adhesion.
The requirements for printing ink are as follows:
①, the transparency is better, the yellowing after drying and forming the film is small, and the metal texture cannot be covered;
②, has good leveling, heat curing and flexibility;
③. It has sufficient affinity for ink and has good adhesion to all kinds of iron sheets.
2. Paint white.
Coating white is iron-impermeable compared to printing white. Can make the pattern clearer, brighter and fuller.
The commonly used raw material for white coating is Bai Ke Ding, which has the following advantages:
①. It is not easy to turn yellow after several times of baking in the drying room.
②. Because the thickness of the white ink is 3-4 times thicker than that of the white ink, it has better whiteness and fullness than the white ink, and it is flat and smooth with enough luster.
③. In Beiketin, the film-forming material is usually a polymer, which is resistant to erosion by various varnishes.
三. Plate making
The plate-making method of printing iron is the same as other plate-making methods, and there are special requirements for the characteristics of tinplate printing:
1. In iron sheet printing, due to the non-absorbability of the substrate tinplate and the iron sheet has a certain hardness, the deformation of the dots during printing is more obvious than that of paper, especially in the dark and midtone areas. Due to the deformation of the dots, the midtone skips and changes. Deep, dark tone changes sharply and upgrades, the use of square dots is more obvious, while diamond dots or round dots, the sudden change of midtones is alleviated. Therefore, the printing iron imposition dots choose round dots or diamond dots, which is suitable for printing iron dots. Reproduction is more advantageous.
2, after the tinplate is printed, it needs to be processed into shape, so the welding seam and other reserved processing parts should be reserved when making up the plate to ensure that the text pattern does not deviate from the center after processing and forming;
3. All welded products such as spray cans must not have graphics, different color spots, etc. on the seam of the printing plate to ensure the need for subsequent welding.
The tinplate can be printed on the machine after the inner coating and outer coating processes. Because the surface of the tinplate is smooth, does not absorb ink, and has a certain hardness and thickness, the tinplate printing generally uses offset printing. The printing principle: oil and water are not compatible. Dot conformation and color, selective adsorption.