How to print a large corrugated carton

1. How to print a large area of ​​solid colors

Household appliances have a large size and large printing format. Many of them contain large blocks on the ground, and require high color brightness. Some of them require overprinting in design. This requires that when printing, it is necessary to ensure that large areas are well-grounded and well-used. Press lightly to ensure that the quality of the overprint is good and the strength of the paperboard is not damaged; it is necessary to handle large blocks of thick ink on the ground (generally 80μm or more) to achieve the required color brightness and saturation, but also to ensure the small text, Fine lines and screen images are clear and moist. It is indeed difficult for the four to take into account.

In order to ensure a good printing effect in a large area, the large-area field parts and small text, thin lines, and screen images can be made publicly. The hardness of the plate material selected for the large-scale field part is suitable for HS40, and the hardness of the plate material selected for the small text, thin lines, and screen images is suitable for HS50-HS55. Note that the thickness of the media must be consistent. The liner material replaces the blanket liner with a foam liner, and the base is based on a thin polyester film base. In this way, large-area real-time printing with small text, thin lines, and screen images are printed on the same surface at the same time. However, the printing pressure actually obtained in printing is different, and the printing pressure on a large-area field site is less than The printing pressure of the small text, thin lines, and screen images is not only not leaking, but also the corrugated surface paper is not concave. This is generally considered to be a large area where the press must be slightly larger in order for printed ideas to be exactly the opposite.

The key point here is that the flexibility of the printing plate is fully utilized: the large piece of the ground is under slight pressure, but the kiss is full, the printed ink is very good, and there is no hard mouth; the small text, thin lines, and the part of the screen image are The plate has a high hardness, and the dots are not easily deformed.

In fact, we have all experienced such experiences: When we print a large area on the ground, if the pressure is too high, it will inevitably lead to defects or leaks.

2. How to handle overprints and overprints

Most of the large-area field printers for home appliance merchandise packaging need thicker ink film, which is difficult for small print.

To solve this contradiction, it is also possible to separate large-scale on-site and small-area graphic and graphic designs. However, when printing, two versions of the same color are used to overprint, a large-area field version is used for thick ink, and a small-area graphic version is provided for light ink, but it cannot be too different. Large, so as not to be too far away from the hue. By taking the required printing pressure, you can also obtain the desired printing effect. This treatment method is superior to the large-area solid ink effect obtained by the stencil sheet printing method.

When overprinting, it is required that the viscosity of the subsequent color ink be moderate, and the viscosity of the subsequent color ink should be slightly higher, and the control is preferably 50 seconds. At the same time, it is also necessary to control the drying speed of the previous color, and the water content of the cardboard must also be low.

In the drying process of the ink, the evaporation drying and the soaking and drying are performed at the same time. The printing ink layer thickness is real-time, and the evaporation and drying process is very slow. However, the penetration drying cannot be performed completely, and it will inevitably affect the subsequent color superimposition. At this time, according to the level of ink PH value, properly add stabilizer or ethanol to adjust, so that the ink drying faster, so as to prevent two-color adhesion and false false. If necessary, another printing press can be used for overprinting. At this time, the ink of the preceding color is already dry, and the overlapping printing is easier.

3. How to do a good field printing

In the field printing, the ink is thickly covered to obtain the desired color saturation and lightness, ie, to obtain the normal color and brightness. After the ink is printed on the corrugated cardboard, a part of the linking material penetrates the surface paper and is absorbed by the paper fibers. A part of the linking material collects on the surface of the surface paper to form an ink film, so the color is more vivid. In order to obtain a thick ink film, the preparation of water-based inks is preferred because large viscosity, adequate pigment ratio, and linking material molecules and auxiliary materials (such as white ink) are selected for large particle materials. Large particles of the binder molecules and auxiliary materials can prevent the ink from penetrating into the interior of the paper fibers, making it easy to form an ink film on the surface of the paper sheet. In addition, it is also advisable to add other substances, such as starch, to obtain the colloidal properties of the ink.

Although home appliance merchandise packaging is inconvenient for complicated mounting and printing due to the characteristics of the merchandise, storage, transportation, and sales environment, it also needs to be colorful. Today, with the continuous development of printing technology, more advanced methods can be used to make home appliance packaging more beautiful and of higher quality.