Offset Ratchet

Offset Ratchet

Technical Analysis: Advantages and Disadvantages of ink emulsion

Well known, Offset printing Printing process, ink emulsification is inevitably there. The so-called emulsion is a dispersed liquid to another immiscible liquids with the phenomenon, it is not emulsified in the ink is served, but there is absolutely no emulsion is impossible without an appropriate offset can not be achieved excellent emulsifying ink transfer process. Over-emulsification of ink to print the harm is very great. Printing press in the shutdown, we can see the surface of the ink roller accumulation of a thick layer as the uneven mesh with virtual burr-like ink, it is our observation with the naked eye can ink over the very obvious degree of emulsification. Then the emulsion over the ink will print what brought the risks?

First Photo Prints hue underweight, not bright colors, printed materials dull, serious deformation network, network hairy, not smooth around, imprinting hair should dry slowly, resulting in dirty sticky back printed materials, collapse and India serious. Caused a large number of ink printed product depth, strength inconsistent with victory, flower version, blind version of the text is unclear, poor ink plate, causing uneven ink printing process. Ink emulsion over many factors, such as is so often the emulsifier, surface active substances with paper solid powder, a filling material, electrolyte, such as pH paper. To reduce ink over-emulsification phenomenon, we must fully understand the knowledge of what material can easily cause over-emulsified ink.

Cause excessive ink emulsion of the following factors:

1. Paper. We commonly used in the production process offset paper coated paper, most will have a certain number of surface active materials and binders filled with materials, in the printing process by the Fountain Solution After the wet Blanket The stripping and rolled numerous times, resulting in surface active material which, through the plate to the ink transfer roller, and water is fine in virtually accelerated the speed of the ink emulsion. Offset the impact of relatively large number of papers, especially those poor sizing, sealing the bad paper out easily loose powder, poor quality, lint-free paper even more serious. The printing process, paper dust free material is rubber rolled strip, plate, spread through the ink roller, and ink in the ink fountain in mixed, reducing ink viscosity, ink destroyed, water resistance, increases ink water absorption, leading to increased ink emulsion.

2. Ink. Ink viscosity, water resistance strong, emulsification value of small, if the ink viscosity, liquid, cohesion between molecules decreases, it is easy to emulsify, another example, the nature of pigment inks, more than water, there are anti- water, the remaining water to easily emulsified, water resistance is difficult to emulsify.

3. Fountain Solution . Fountain solution of ordinary, non-ionic surfactant, fountain solution, alcohol fountain solution, etc. ... ..., alcohol and fountain solution is a non-electrolyte solution, alcohol due to evaporation speed, thereby greatly reducing the value of the ink emulsion. Ordinary fountain solution must be in the process of using fountain solution used test paper, pH value controlled at 3 to 4.5 below, remain weak acid. Maintain the appropriate ink emulsification, but both had to control that amount of fountain solution. More likely to cause the greater amount of ink the emulsion.

4. Blending with supporting material plus 6 # adjust ink viscosity oil or sprinkle moment can reduce the viscosity of ink. Increase the mobility of ink, but also reduces the water resistance of ink, the ink is prone to emulsification. So be sure to control the amount of printing. As control at 2% to 3% of chaos must not blindly add. There are also such as diluent, white oil, peacekeeping forces oil, withdrawal of light dose, white ink, etc. These support materials are easily cause the ink emulsion. Especially the white oil, peacekeeping forces most likely to cause ink Oil Emulsion.

5. Other factors. Shop temperature and humidity, as well as the operation of the machine speed and other factors, all of the ink emulsion has a large role, such as the plant the higher the temperature, the more diluted ink, while the greater mobility, viscosity, smaller, less water resistance, with the machine speed, the greater the interaction, the higher the surface temperature of the ink roller, these factors can easily cause over-emulsified ink, so plant must be controlled and balanced temperature about 20 , humidity 55% to the general control 65 %, and the room temperature higher, the more easily emulsified ink.

Above, so that we fully understand the result of various factors emulsion ink easily, if targeted correctly to moderate ink emulsion, you can print outlets clear tone and distinct, bright color printed materials.
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