Printed pages are even and colorful

The uniform and colorful color of the printed page layout is the basic requirement for product quality. In particular, some color printing packaging and decoration products, due to the printing layout is large, the amount of ink is also increased accordingly, so that the layout of the ink layer thickness, uniformity, and directly affect the appearance of the product quality. Layout ink color printing is one of the quality problems that easily appear in the color printing products of the letterpress process. The reason is due to process error factors, and the cause of abnormal operation technology; there are equipment defects. There are also defects caused by raw materials. Therefore, only by correctly understanding the cause of the color of the product printing ink, can we fundamentally solve the problem, to achieve the purpose of better eliminate the quality of the printed product ink color failure.

First, the printing plate base material characteristics do not cause the phenomenon of ink color printing products

In fact, maintaining a constant printing pressure is an important condition for ensuring the stable quality of printing ink. Factors that affect printing pressure, in addition to the accuracy of the equipment, are related to the characteristics of the bottom plate (base) material of the printing plate. For presses such as letterpress flattening and round flattening structures, plates such as copper, zinc plated or resin plates used for printing need to be printed on the bottom plate. It can be seen that the bottom tray plays an important role in the printing process, which requires that it should have the solid, firm, pressure-resistant and non-deformable advantages, so as to ensure the stability of the printing ink quality. The process practice shows that traditional plywood materials act as printing plates, which not only have many drawbacks, such as low printing durability of the printing plate, proneness of overprinting and the like, but also easily cause poor ink transfer and cause ink layer on the printing plate. The occurrence of uneven or insufficient conditions is mainly due to the fact that the wood pallet itself has defects of poor solidity and easy deformation, which makes it difficult to evenly transfer the ink layer on the printing plate to the printed sheets, and the phenomenon of ink blooming tends to occur. In order to avoid the occurrence of this situation, it is necessary to put a good pad plate process technology, when printing plate underlay must be evenly pad, pad real, for the printing area of ​​the larger layout, it is best to use a metal version of the die tray die cut hot stamping Indentation, such as magnetic version tray, aluminum tray and so on. The metal plate holder has the advantages of flatness, good solidity, and high compressive strength, which can better ensure the stability of the printing pressure and effectively prevent the occurrence of printing ink color quality problems.

Second, the machine is poor or adjust the discomfort caused by the printing ink phenomenon

When the machine ages the roller shaft head, bearings, gears, racks, ink roller system and parts that are linked and imprinted, there is obvious wear and looseness, which will affect the stability and uniformity of the printing pressure and the printing of the layout. In this case, Next, if the printing area of ​​the larger plate products, it is prone to the occurrence of ink color phenomenon. In order to prevent this from happening, you should always pay attention to the maintenance of the equipment, especially the associated parts such as the machine's imprinting and ink roller bearing, to maintain a good lubrication state, prevent the wear and loose of the key parts of the machine. phenomenon. In addition, the position of the ink roller is also uncomfortable and it is easy to cause the printing ink to bloom. Therefore, the contact between the ink roller and the skewer iron roller and the printing plate should be uniform, and the pressure should be moderate, so as to prevent the printing ink from blooming due to the poor contact of the ink roller.

Third, the lining discomfort caused by the printing ink phenomenon

The lining is the medium for printing pressure and the transfer of the ink layer of the layout. The material characteristics of the lining and the quality condition of the lining directly affect the ink quality of the printed product. If the deformation coefficient of the lining is large, the flatness is poor, and the ink on the printing plate surface is prone to hair blooming. Therefore, only according to the characteristics of printing, scientific and rational choice of lining materials, so that the lining in the printing to maintain good stability, in order to ensure the stability of the ink quality. According to experience in production technology, when printing plates or textured plates with soft resin plates, rigid packing materials with hard texture, high toughness, and low deformation factors, such as cardboard, kraft paper, insulation paper, and films should be used. Base, etc., the quality of printing ink is relatively stable. If hard copper and zinc plate printing plate products are used, since the flatness, gloss and ink receptivity of this type of plate are relatively poor, it is advisable to use neutral materials with certain elasticity, such as cloth, blanket, and nylon. Cloth, fine-grained cloth, offset paper, and newspapers, etc., can better prevent the occurrence of ink color defects.

Fourth, the printing material ink discoloration phenomenon

If the plate product uses a zinc plate material to print a large area of ​​the product, it is prone to ink blooming. The main reasons for this are as follows: oxidation of the surface of the sheet forms a "sand-eye" shape, and the temperature of the baking plate is too high, the level of the etching liquid is too high, and the ink affinity of the plate is poor, so that the ink layer and the printed surface of the plate when imprinting There is a poor contact phenomenon, resulting in the emergence of ink defects. In this regard, the solution is: grind the surface of the printing plate with charcoal, so that the slight roughening phenomenon of the plate is eliminated or reduced, and the printing pressure and the amount of ink supply should be appropriately increased during printing. For finely printed plate products, a solid resin plate should be used for printing. This version of the material is soft, and the gloss and ink affinity are better. It can better avoid the phenomenon of printing ink color and ensure the quality of the ink on the product layout.

Fifth, the paper caused by the ink material bad phenomenon

The production practice shows that the rough surface of the paper has a large amount of ink absorption. This is due to the fact that the paper fibers interweave to create a certain gap. The concave paper surface is prone to poor contact with the plate surface and requires a large amount of ink to meet the requirements. Paper blotting needs. In this regard, if the printing pressure is insufficient and the ink layer is thinly coated, it is easy to cause the phenomenon of blooming in the printing ink layer of the printing product. Therefore, when printing paper with poor smoothness, the printing pressure should be appropriately increased, and the amount of ink applied must also meet the requirements for uniform layout and ink reception in order to prevent ink quality problems from occurring.

Six, printing ink ink phenomenon caused by improper use of ink additives

Detackifiers, anti-sticking agents, etc. are auxiliary materials for ink formulation. Adding appropriate amount and proper use can play a certain anti-sticking effect. However, if the amount is too much or the mixing is not uniform, the ink color of the printed product is very likely to cause blooming. In particular, the improper use of the anti-sticking agent is more likely to cause the problem of printing ink color failure. If the anti-adhesive agent is added directly to the ink without stirring evenly, then, due to the coarse particles of the anti-adhesive agent transferred to the layout, the ink receptivity of the plate layout will be greatly weakened, and the ink color of the printing will appear to have a malaise. . Therefore, the correct use of the anti-adhesive agent is a crucial link, and the amount of the anti-adhesive agent added to the ink is generally not more than 4%. When deploying, the anti-sticking agent should be thinned and mixed evenly with bright oil or varnish, so that it becomes a liquid with certain fluidity. After adding the ink, it can be evenly distributed to the ink after repeated stirring. , Printing can play a better anti-sticking effect, but will not cause the phenomenon of flowering ink.

To sum up, as long as we usually in the production process practice, pay attention to sum up the production experience, accurately understand and grasp the cause of the various causes of ink color printing products, so take the appropriate process and technical measures, the good process and operating technology , you can avoid the blindness of the process operation, so that other packaging, not only can improve the production efficiency, but also can effectively guarantee the product's ink quality.

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