The uniformity and bright colors of the printed surface are the basic requirements for product quality. Especially for some color-printed packaging and decoration products, due to the large printing surface, the amount of ink received also increases accordingly. In this way, the thickness and uniformity of the ink layer on the layout directly affect the appearance quality of the product. The printing ink color is one of the quality problems that are prone to occur in the color printing products of the letterpress process. The reasons are caused by the mistakes in the process, and also caused by the abnormal operation technology; there are defects in the equipment. There are also defects in raw materials. Therefore, only by correctly understanding the causes of the printing ink color hairs of the products can we fundamentally solve the problem and achieve the purpose of better eliminating the printing product ink color hairs quality failure.
1. The printing ink color phenomenon caused by the unsuitable characteristics of the plate support material
In fact, maintaining a constant printing pressure is an important condition for ensuring the stability of the printing ink color, and the factors that affect the printing pressure, in addition to the accuracy of the equipment, are also related to the characteristics of the base (base) material of the printing plate. For example, the printing presses of relief flattening and round flattening structure, the copper, zinc plate or resin plate used for printing, need to use the bottom plate to paste the printing plate in order to print. It can be seen that the bottom bracket plays an important role in bearing pressure during printing, which requires it to have the good advantages of solidity, firmness, pressure resistance and no deformation to ensure the stability of the printing ink color quality. The process practice shows that the traditional plywood material used as a printing plate not only has many drawbacks, such as low printing durability of the printing plate, products are prone to overprinting and other phenomena, but also easy to produce poor ink color transfer, causing the ink layer on the surface The occurrence of unevenness or insufficiency is mainly due to the defects of poor solidity and easy deformation of the wooden backing itself, which makes it difficult for the ink layer on the plate surface to be transferred to the printed sheet uniformly, and it is easy to produce the phenomenon of ink color blooming. In order to avoid this situation, it is necessary to shut down the plate process technology. When the plate is under padding, it must be evenly and solidly. For a large printing area, it is best to use metal plate die cutting hot stamping Indentation, such as magnetic plate holder, aluminum plate holder, etc. The metal plate holder has the advantages of flatness, good firmness and high compressive strength, which can better ensure the stability of the printing pressure and effectively prevent the occurrence of printing ink color hair quality problems.
Second, the printing ink color phenomenon caused by poor machine or adjustment discomfort
When the machine is aging, there will be obvious wear and looseness on the roller shaft head, bearings, gears, racks, inking roller system and linkage imprinting components, which will affect the printing pressure and the stability and uniformity of the inking on the plate. In this case Next, if the printing area is larger, the ink color is prone to appear. In order to prevent the occurrence of this undesirable phenomenon, we should pay attention to the maintenance of the equipment, especially the related parts of the machine, such as the imprint and the ink roller bearing, must maintain a good lubrication state to prevent the key parts of the machine from wearing and loose phenomenon. In addition, the unsuitable position of the inking roller is also likely to cause the printing ink color to bloom. Therefore, the contact between the inking roller and the inking iron roller and the printing plate should be uniform and the pressure should be moderate to prevent the printing ink color from blooming due to the poor contact of the ink roller. [next]
Third, the printing ink color phenomenon caused by discomfort
The liner is the medium for printing pressure and the transfer of the ink layer on the layout. The material characteristics of the liner and the quality of the liner 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 color of the printed plate surface is prone to flowering. Therefore, only according to the characteristics of printing, scientifically and rationally choose the lining material, so that the lining maintains good stability in printing, to ensure the stability of the ink color quality. According to the experience of the production process, when printing plates or anilox plates with a soft resin plate, a hard lining material with a hard texture, a strong toughness, and a small deformation coefficient should be selected, such as cardboard, kraft paper, insulating paper and sheets The quality of printing ink is relatively stable. If copper or zinc plate printing products with harder materials are used, due to the relatively poor flatness, gloss and ink affinity of such plates, it is advisable to choose a neutral with certain elasticity, such as cloth, blanket, nylon Cloth, fine-grained cloth, offset paper, newspapers, etc., which can better prevent the occurrence of quality defects of ink color hair.
Fourth, the printing material ink color phenomenon caused by discomfort
If the plate product is printed on a large area with zinc plate material, ink color is also prone to appear. The main reasons for this are: the appearance of the plate surface is oxidized to form a "sandeye" 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. There is a phenomenon of poor contact, which causes the appearance of ink color hair ills. In this regard, the solution is to use charcoal to grind the surface of the printing plate, so that the slight roughness of the plate surface is eliminated or reduced, and the printing pressure and the supply of ink should be appropriately increased during printing. For fine-printed plate products, it is best to use solid resin plates for printing. The material of this version is soft, and the gloss and ink affinity are relatively good, which can better avoid the printing ink color blooming phenomenon and ensure the ink color quality of the product layout.
Fifth, the printing ink color phenomenon caused by poor paper material
The production practice shows that the rough surface of the paper has a large amount of ink absorption. This is because the paper fibers interweave to produce a certain gap. The concave paper surface is prone to poor contact with the printing plate surface, and requires a large amount of ink to meet Demand for ink absorption on paper. In this regard, if the printing pressure is insufficient, and the ink layer is applied thinly, it is easy to make the ink layer on the printing plate appear flowery. Therefore, when printing papers with poor smoothness, the printing pressure should be increased a little, and the amount of ink coating should also meet the requirements of uniform inking and ink receiving on the layout, so as to prevent the occurrence of printing ink color quality problems. [next]
Sixth, the printing ink color phenomenon caused by improper use of ink additives
Anti-sticking agent, anti-sticking agent, etc. are auxiliary materials for the preparation of ink. Adding an appropriate amount and using it properly can play a certain role in anti-sticking. However, if excessive dosage or uneven stirring exists, it is very easy to cause the ink color of the printed product to bloom. In particular, the improper use of anti-sticking agent is more prone to the problem of printing ink color quality failure. If the anti-sticking agent is added directly to the ink without stirring evenly, then the coarse particles of the anti-sticking agent will be transferred to the plate surface, which will greatly reduce the ink affinity of the printing plate surface, and the printing ink color will be ill. . Therefore, the correct use of anti-sticking agent is a crucial part. The amount of anti-sticking agent added to the ink should not exceed 4%. When blending, the anti-sticking agent should be thinned with gloss oil or ink oil and mixed evenly to make it a liquid with a certain fluidity, so that it can be evenly distributed into the ink by adding it to the ink and then repeatedly stirring. , It can play a good anti-sticking effect when printing, and will not make the ink color appear flowery.
In summary, as long as we usually practice production processes, we pay attention to carefully summarizing production experience, accurately understand and master the various causes of ink color development of printed products, so as to take corresponding technological measures to control the process and operation technology. , You can avoid the blindness of the process operation, so that other packaging can not only improve production efficiency, but also effectively ensure the product's ink color quality.
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