The Influence of the Temperature and Humidity of the Printing Workshop on Offset Quality (2)

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2. The temperature is too low, the viscosity of the ink is too high, and production is forced to stop. One year in January and mid-January, the temperature dropped sharply, the temperature is generally -25 ~ -27 °C, although the workshop has a heating supply, but the night temperature is only 5 °C. Under such operating conditions, it is difficult to properly adjust the ink viscosity and fluidity so that it has a good printability. Adding various auxiliary agents to reduce the viscosity of the ink will inevitably increase its fluidity and will result in process failures with excessive fluidity. When we printed a batch of color printing in the night shift, we added ink that had been placed in advance on the heating side to the ink fountain, and added some de-sticking agent and No. 6 varnish, but in less than half an hour, the ink became hard again. Because the temperature is too low, the internal cohesion of the ink is increased, the activity of the oil molecules is weakened, the discrete force is reduced, and the ink is not easy to pull and break. In the printing, the pressure of the embossed teeth is insufficient to overcome the combined force of the adhesive force and the peeling force of the blanket on the paper. As a result, a fault occurs where the paper is stuck on the blanket. Although we have taken measures such as lightening the printing pressure, replacing the blankets, and reducing the printing speed, we still cannot eliminate the malfunction and stop production. On the following day, after the temperature of the shop picked up again, there was no failure of the paper sticky blanket and production returned to normal.

In summary, changes in temperature and humidity do have a major impact on offset printing production. It is recommended that qualified manufacturers should try their best to improve the status of the offset printing plant and provide a relatively stable temperature and humidity environment for offset printing to ensure normal production.