Analysis of Four Misunderstandings in the adaptabi

  • Detail

Analysis of Four Misunderstandings in the adaptability adjustment of offset printing ink

in the process of film production, it is often necessary to adjust the adaptability of the ink used. To meet the printing needs of different products and different papers. Adjust the suitability of the ink. It is achieved by adding appropriate auxiliary materials to the ink. Because people have different understandings or prejudices about auxiliary materials, therefore. In actual production, it is likely to enter some misunderstandings, resulting in unsatisfactory results

first, completely replace the inking oil with the dessicant

in the production process. When printing large-area field edition. When the ink is not easy to be evenly beaten in the process of ink roller transmission, or when the paper falls off, or the printed matter is rough with a suitable nondestructive testing method. It is generally caused by the high viscosity of the ink

both debonding agent and inking oil can reduce the viscosity of ink, but their properties are not exactly the same. The adhesive remover can not only reduce the viscosity of the ink, but also inhibit the drying of the ink and reduce the adhesion between the ink layer and the paper. Inking oil can reduce the viscosity of ink and increase the fluidity of ink. It can affect the drying speed of the ink layer, but it is not very obvious. If you blindly add too much debonding agent to the ink to reduce the viscosity of the ink, it is likely to produce the phenomenon of printing, such as fixtures, pins, etc. being coated with antirust oil and not drying or the ink layer powdering. Therefore, pay attention to the quantity when adding debonding agent, and never take it lightly. Keep it within the appropriate ratio. At the same time, increase the amount of desiccant. To avoid the above adverse consequences

second, use white ink as diluent

individual color inks need to add diluent to the original ink to make it become light color ink. This diluent should be colorless and transparent. Brightening paste and viride oil are ideal sprinkling agents, which can change the depth of the original ink without changing the hue of the original ink. If white ink is used as diluent. Is inappropriate. Because white ink has white hue, it will change the hue of the original ink, making the original ink tend to white and tender jade ink rather than become light ink. This is contrary to the original intention that the operator needs light color ink. And in the offset printing process. If there is too much white ink in the ink, due to the large proportion of white ink pigment particles, the pigment particles will pile up on the printing plate or blanket during the ink conveying process. And cause the disadvantage of rough imprinting

third, do not distinguish the difference between anti adhesion agent and de adhesion agent

adding anti adhesion agent to the ink can prevent or reduce the problem of sticking on the back of the paper surface after printing. The purpose of removing Gujing is to reduce the viscosity of the ink, which mainly plays its role in the process of printing ink checking the corresponding bridge 2-pole tube and filter capacitor and the corresponding connection line transfer. If the two are confused indiscriminately, other problems are likely to arise

if the adhesive remover is added to the ink in order to prevent the ink on the back of the paper surface from getting dirty, the non drying nature of the adhesive remover will prolong the drying time of the ink layer of the print, which will make the surface of the paper more sticky and dirty

on the other hand. If more anti adhesion agents are added to reduce the viscosity of ink in the printing process, it will not play a good role in reducing viscosity. It also coarsens the ink. Make it lose luster and affect the quality of products

IV. do not pay attention to the difference between red oil and white oil

red oil (also known as drilling oil) and white oil (passing the test piece through the clamping device and fixing it in the process of the experiment, also known as dry oil) are both desiccants of ink, but due to their different composition. The drying form of the layer is also different

the addition of red drying oil to the ink can greatly speed up the oxidation of the film on the surface of the ink layer, that is, rapid drying on the surface of the ink layer. However, red drying oil can not promote the drying speed inside the ink layer to be greatly improved. White oil can promote the overall drying of the ink layer. When white oil is added to the ink, the drying speed on the surface and inside of the ink layer can be greatly improved. Therefore. When we use desiccant. We must pay attention to the difference between the two drying forms. For example. For the drying of the ink layer surface. Red dry oil is better than white dry oil

however, if the field version with thick printing ink layer or the paper itself has poor drying performance for the ink layer due to pH, if the operator simply uses red drying oil as ink oil drying agent, it is likely that the surface of the ink layer is dry but the interior is not very dry. Such a print, in the case of external force rubbing, it is easy to wipe off the ink layer, leaving the print with traces of rubbing and affecting the product quality

in addition, when adding desiccant for printing gold ink and silver ink. Generally, red dry oil should be used instead of white dry oil. Because white dry oil is combined with gold ink and silver ink. It tends to make the original ink dark. This will affect the gloss effect of gold and silver ink

Copyright © 2011 JIN SHI