How to choose the mesh of the screen version

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How to choose the version of the eye

eye tone products is the object that should be paid attention to in the quality control of color printing process. In order to print high-quality fine-grained products, the technology of production process. It is very important for supermarkets to check the purchase of plastic bags from regular manufacturers

1. Select the color liner with appropriate hardness to make the dot print clear and bright

whether it is the embossing process printing eye tone products, or the lithography process printing point, the soft and hard degree of the pad is an important factor determining the point printing effect. If the pad is too soft, the dot printing of the safety device is easy to deform and expand. To make the dot print clear and bright, a neutral and hard pad should be used. Insulating paper, cardboard, kraft paper, sheet base, etc. are hard liners. Cloth, fine cloth and newspaper belong to soft lining, which is easy to deform after being pressed

2. Adjust the appropriate printing pressure

relief and lithography printing point products need to realize imprint transfer through pressure. If the pressure is too large, it is easy to expand and deform the point, and even accelerate the wear of the printing plate. If the pressure is too small, the point reproduction effect is poor, the point is easy to be blurred, and the hierarchy of the printed image is poor. The printing pressure should be based on the uniform and moderate contact between each drum and between the drum and the printing plate (relief plate), so that the two in contact with the impression are in a relatively parallel state

3. Adjust the contact pressure of the ink roller on the printing plate, and select the rubber roller with appropriate soft and hard

rubber roller is the main carrier of ink transmission. Adjusting its appropriate contact pressure on the printing plate plays an important role in the quality of dot printing. The ink roller pressure is too large, which is easy to wear and deform the plate spots, and it is easy to produce a paste situation. If the ink roller pressure is too small, it is easy to cause uneven and insufficient ink on the layout, making the dot printing unclear

4. Select ink with high fineness for printing

if the ink printing dots with low fineness are used, the printing dots are easy to hair due to the coarse ink and pigment particles, and the printing plate has low printing resistance. Low ink fineness is also prone to paste defects. Therefore, printing point products should be printed with ink with high fineness. The ink with high fineness has a high concentration, which can make the printing point clear and full

5. Pay attention to adjust the viscosity and fluidity of the ink

the viscosity of ink is high, which is easy to cause uneven ink transfer. Dot galling, flower plate, paste plate and other phenomena; If the viscosity of the ink is small, it is easy to emulsify the ink, and make the layout floating, so it cannot play the normal role of the instrument, and it is dirty. The fluidity of ink is closely related to viscosity. The fluidity of ink with high viscosity is relatively small. On the contrary, liquidity is large. The fluidity of the ink is too small, which is easy to cause the coating to be not smooth and uneven, so that the reproduction effect of the print point is poor; Ink with too much fluidity is easy to make dot printing less full, and the definition is poor in recent years. Therefore, when the viscosity and fluidity of the ink are not suitable, additives and ink blending oil can be used for adjustment

6. Pay attention to selecting appropriate paper for printing detailed products

the smoothness of the paper directly determines the printing quality of the dot. If the smoothness of the paper is poor, the points cannot be accurately restored. Because the paper surface is sunken, the dots cannot be printed, so the printing level effect is bound to be bad. Therefore, the paper with good smoothness should be selected for printing eye tone products to ensure the true reproduction of the original. Generally speaking, coated paper, glass card and other paper or paperboard have good smoothness, and their printing details are of good quality

7. Pay attention to maintain the equipment to prevent dot printing deformation

the accuracy of the equipment determines the printing quality of the product. If the accuracy of the equipment is poor, the increase value of the printing point is large, and the product quality is bound to be poor. Therefore, at ordinary times, we should pay attention to the maintenance of the equipment and do a good job in the lubrication of key components, such as roller gears, shaft heads, linkage imprinting devices, etc. we should maintain a good lubrication state to prevent the imprint expansion caused by wear and looseness of machine parts, and the dot printing deformation caused by blooming or ghosting

8. Pay attention to control the appropriate printing speed and improve the registration accuracy

9. According to the color number of the printed matter, the model should be reasonably selected for printing to ensure the quality of the printed matter

practice shows that selecting a suitable printing machine for printing according to the characteristics of printing is an important way to improve product quality. Multicolor overprint fine eye tone products should be printed by multicolor machine as far as possible to improve the registration quality of products

to sum up, as long as we pay attention to each process and technology link in the production process, and adopt appropriate process and technology according to the characteristics of the product

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