Countermeasures for Issues of Proofing

Every now and then sampling is required before formal orders for paper boxes or paper bags are confirmed. And proofing acts a quite major role for sampling. Proofing is to simulate printing for the manufacturer and the customer to check whether the printing plate tone can reproduce the color required. 

Considered as the bridge between plate making and printing, proofing influences the quality of plate making and printing. There are some frequently discussed problems during proofing which would be analyzed here too.

Firstly, excessive dot could be spotted. One way to improve the excessive dot is to add 2% extra oil to enhance the oil viscosity and lower the indoor temperature in summer when it is too hot for the printing condition.

And below factors can be referred as counter-measures for excessive dot.  Excessive pressure on the plate platform should be reduced. The best pressure ranges from 0.1mm to 0.11mm, with that for paper platform being 0.12 mm to 0.13 mm. The aged rubber blanket should be replaced in time to make sure of good oil absorption and good transferring performance. Besides, excessive pressure on the roller accelerates the aging speed of the roller making it hard to manage the ink properly. Therefore, the pressure between the roller and the platform should be adjusted to 6 mm, and in-time replacement of the rollers should be executed too. Moreover, excessive ink application should be prohibited and professional printing operations should be emphasized on to workers.

Secondly, hollow dot could also be spotted in cold environment such as in winter when there is low humidity which makes the ink with high viscosity and inappropriate pressure imposed. The temperature of the plate platform should be increased and 5% detumescence agent should be added.

To make sure of quality paper packaging products, manufacturers should pay attention to every production procedure to fulfill their responsibility for satisfying products and market expectations.