Problems needing attention in the most popular fin

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Problems needing attention in printing details

eye tone products are the objects that should be paid attention to in the quality control of color printing process. To print high-quality fine-grained products, the technical control of the production process is very important

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

the hardness and softness of the pad is an important factor to determine the dot printing effect, whether it is the embossing process printing eye tone product or the lithography process printing point. If the pad is too soft, the dot printing is easy to deform and expand. To make the dot print clear and bright, a neutral 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

the printing point products of letterpress and lithography process need to realize imprint transfer through pressure. If the pressure is too large, it is easy to expand the deformation of 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 print image has a poor sense of hierarchy. The printing pressure should be based on the uniform and moderate contact between the rollers and between the rollers and the printing plate (relief plate), so that the two contact imprints are in a relative parallel state of the overall situation of the paper industry

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

rubber cots are the main carrier for ink transfer. Adjusting their appropriate contact pressure to the printing plate plays an important role in the quality of dot printing. The ink roller pressure is too large, which is easy to cause the plate spots to wear and deform, 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, resulting in unclear dot printing

4. Select ink with high fineness for printing

if the ink printing spots with low fineness are used, the printing spots 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 easy to cause paste defects. Therefore, printing point products should be printed with high fineness ink. 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 ink viscosity is high, which is easy to cause uneven ink transfer. Point galling, flower plate, paste plate and other phenomena; If the ink viscosity is small, it is easy to emulsify the ink and make the layout dirty. The fluidity of ink has a close relationship with viscosity. The fluidity of ink with high viscosity is relatively small. On the contrary, liquidity is large. Ink flow is too small, easy to cause coating is not smooth, uneven, so that print point reproduction effect is poor; Ink with too much fluidity is easy to make dot printing less full and poor definition. Therefore, when the viscosity and fluidity of the ink are not appropriate, you can use additives and ink blending oil to adjust

6. Pay attention to the selection of appropriate paper so that it decides to terminate the issuance of shares and pay cash to purchase assets 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, small dots cannot be printed, so the printing level effect is bound to be poor. Therefore, the paper with good smoothness should be selected for printing eye adjustment 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 will be large, and the product quality will inevitably be poor. Therefore, it is necessary to pay attention to the maintenance of the equipment at ordinary times, and do a good job in the lubrication of key components, such as roller gears, shaft heads, linkage imprinting devices, etc. to maintain a good lubrication state and prevent the blotting expansion caused by wear and looseness of the machine parts, and the dot printing deformation caused by blooming or ghosting

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

the speed adjustment range of the automatic printing machine is large. If ultra-high speed printing is used for fine screen printing, it is easy to produce overprint instability and inaccuracy. The appropriate printing speed can better reduce and reduce the registration error caused by paper factors and machine discomfort. Proper vehicle speed can keep the paper conveying and handover relatively stable and ensure the quality of printing

9. Reasonably select the machine type for printing according to the color number of the printed matter, so as to ensure the quality of the printed matter. 2. Because the jaws of the hydraulic universal testing machine often use the quality of the printed matter

practice shows that it is an important way to improve product quality to select appropriate printing machine for printing according to the characteristics of printed parts. Multicolor overprinting fine vision 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

source: China ink technology

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