Heidelberg CD series offset printing machine
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Offset fountain solution is also called water bucket solution, which is called offset printing syrup. It is used to wet the printing plate surface during offset printing. It uses the principle of ink incompatibility to realize the aqueous solution in which some parts of the printing plate do not adhere to ink.
Offset printing is about ink and water balance. The quality of offset printing is largely related to dampening solution, so the correct use of dampening solution and mastering the nature of dampening solution is the key to improving print quality. For Heidelberg CD102 series offset press, how can we correctly master the nature and use of dampening solution?
The main component of the fountain solution used in the Heidelberg CD102 offset press is composed of three parts: water, alcohol and moisturizing powder. Water - printing is usually neutral water, and water is generally added with 2% - 5% wetting. Powder, the pH value of water is generally controlled between 5.2-5.5, the acidity is too large, the printed products are dull; the acidity is too small, the printed products are easy to paste and dirty.
Alcohol - Alcohol is volatile and can take away heat. When alcohol is added to water, it can reduce the surface tension of water, so that water can be evenly distributed on the printing plate. When printing, the amount of alcohol is generally set at 11%- Between 15%, after more than 15%, the alcohol concentration will not be displayed correctly, and the maximum should not be higher than 18%. Otherwise, according to the software setting of Taichuang Company, the machine will automatically stop the machine after 15 minutes. If the alcohol concentration is too low, the printed product is easy to be dirty; the standard temperature of alcohol is generally controlled between 10 ° C and 12 ° C, especially in summer, the lowest temperature can not be lower than 9 ° C, the temperature is too high, the plate heat is not easy to take away, the temperature Too low, the alcohol tank is overloaded, and the condensed water will be produced in large quantities, which is not conducive to the quality of the printed products.
Wetting powder - the main component is a surfactant, which can improve the activity of the whole water hopper. The main function of the arabic resin glue inside is to protect the printing plate and improve the printing durability of the printing plate. In addition, there are certain additives for suppressing the foaming agent. When using the wetting powder, it should be handled strictly in accordance with the requirements of the manual.
It is important to note that during the actual operation, alcohol and additives are added when water is added to the tank; water is also required when the control cabinet is filled with alcohol or additives. Water and alcohol or additives must be added at the same time to maintain a basic balance of solution concentration and to stabilize the dampening effect of the product. Some operators directly add a large amount of anhydrous alcohol to the dampening solution, which may cause the solution concentration to be extremely unbalanced, which may affect the printing durability of the printing plate, and even the dampening solution tank may be protected due to the excessive alcohol concentration. Re-cooling.