Causes and preventive measures for the explosive line of frosted ink printing ink layer
[China Glass Net] 1. Ink film is thick and brittle
The frosted ink particles are coarse, wherein the additive particles have a diameter of about 15 to 30 μm, the thickness of the ink layer after screen printing can reach 100 to 150 μm, and the surface of the ink film is rough, and the printing material is a non-absorbent material, and the ink is applied thereto. The adhesion is poor and the ink film is thick. The characteristics of large brittleness are prone to bursting when subjected to large pressure.
2, improper drying after printing
When the frosted ink is printed and passed through the UV curing device, the surface temperature of the exposed surface is too high, the polymerization reaction continues, and the ink layer automatically blasts after curing.
3, improper die cutting and indentation operation
Die-cut indentation quality is a major factor affecting the appearance of the carton. The selection of die-cutting knives and indentation steel wires is unreasonable, and improper use is the main cause of the explosion of the ink layer, such as the slowness of the die cutter.
4, improper paper processing
The structure of the paper, the pre-printing and improper handling during the printing process are also factors that cannot be ignored. If the paper is too poor or the water content of the paper is too low, the paper will be brittle and the toughness will be lowered, which will also cause the ink layer to burst. If the paper is not wetted or the semi-finished product is improperly stored, the water content of the paper is low. After high temperature and calendering, the paper becomes brittle and it is easy to crack after being pressed.
Prevention of ink layer explosion
1, the correct design of the matte pattern
When designing, the frosted pattern should avoid the molding part of the packaging box as much as possible. It should be at least 2~3mm away from the indentation and die-cutting position to avoid damage to the matte ink during die-cutting, so as to promote the three-dimensionality.
2, choose the appropriate matte ink, reasonable control of the thickness of the ink layer and UV curing temperature
First of all, we must ensure that the mesh size and particle size are compatible with each other. Generally, 150-200 mesh is used for coarse sand, 200-250 mesh for medium sand, and 300-400 mesh for fine sand.
Secondly, in the printing process, the viscosity of the ink is correctly selected according to the particle size of the ink. The coarse sand is generally controlled at 2000±100 CPS, the medium sand is controlled at 3000±100 CPS, the fine sand is controlled at 3500 soil 100 CPS, and the ink additive is added as little as possible. Choose the right UV lamp. The UV lamp power is recommended to be around 10 kW. The UV curing equipment must be equipped with a cooling device. Generally, a large-diameter air exhaust duct is installed and a water cooling device is installed on the lamp tube, so as to avoid thermal deformation of the paper jam when passing through the light-solid device. The paper is brittle.
3. Reasonable design and arrangement of die cutting process
The perfect shape of the carton comes from the correct die-cutting indentation. The nature of the gold (silver) cardboard and matte inks determines the complexity of the die-cutting process.
4, maintain appropriate temperature and humidity
The gold (silver) paper jam needs to be humidity-treated before printing to stabilize the water content. During the storage of semi-finished products and during die-cutting, care should be taken to keep the temperature and humidity of the workshop constant and ensure that the paper has a suitable water content. The worse the quality of the base paper, the drier the cardboard, and the higher the chance that the printed matter will explode. In case of abnormal weather changes, the die-cutting processing time and the die-cutting stencil should be adjusted in time, and the die-cutting should be avoided in the case where the paper and ink film are brittle.
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