Printing iron ink

Iron printing inks are thermosetting inks that require high temperature drying. The specificity of the printing iron barrel determines the factors that affect the ink color change. The following are the main factors affecting the ink color change in printing iron barrel printing:

The first is the inaccurate weighing or uneven mixing during deployment

Ink preparation is to weigh the corresponding amount of the components of the original ink according to the ink ratio, and then put together and stir evenly. At present, electronic scales are commonly used for weighing. When an operator weighs the original ink, the ink color may be inaccurate during printing due to inaccurate weighing or uneven stirring during dispensing, especially when light ink is dispensed. For example, pink, light green, light blue and so on. Light-colored inks are generally prepared by adding a large amount of white ink or diluting agent to the original ink of the corresponding hue, wherein the proportion of the original ink is small, but the color rendering effect in the spot ink is very obvious. If the original ink weight is slightly inaccurate, the hue of the spot ink will be greatly affected.

Second, in the production of standard color drafts (proofing), the proportion of small batches of spot color inks is inaccurate

In printing iron, the standard color draft used to guide printing is made by proofing. The spot color ink used in the proofing is the small batch of ink dispensed by the operator. After the sample draft is completed, the customer's signature confirmation will become the standard color draft for guiding the printing. Once the customer has signed and confirmed, the proportion of the spot color ink on the standard color draft is based on the proportion of the ink when the small batch of ink is dispensed at the time of proofing. If the proportion of the ink in the low-volume production is not accurate, the color difference when printing the large-volume ink will be very large, and this difference is especially reflected in the spot ink where the ratio of the original ink of each component is relatively large. For example, yellow: magenta = 100:1, yellow: magenta: cyan = 100:8:0.3, etc. If one of the inks is weighed in a ratio of 1 or 0.3, a slight weighing is inaccurate, and when a large amount of ink is dispensed, There will be a big change in color.

Again, too much dilution oil (diverted oil) is added

Imprinted ink has the characteristics of resistance to mechanical processing, and its performance is characterized by higher viscosity and less fluidity, which is very unfavorable for the transfer of ink during printing. In order to improve its printability, an appropriate amount (less than 5%) of diluent is often added to reduce the ink stickiness while increasing the fluidity. However, the amount of diluent can not be added too much, because the printing of the iron-making barrels is to be baked in an oven at 50°C-180°C for 10-15 minutes. During the baking process, the thinner and the ink are dried together. If the diluent is added in excessive quantity, the ink is too thin, and the dots will be made ridiculous after baking, and the actual color will be changed accordingly, resulting in a difference between the actual printing color and the standard color draft.

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