Paper Printing Failure Caused by Paper Defects and Troubleshooting Method II

The surface strength of paper refers to the degree of bonding between the paper fiber structure, filler and rubber compound. If the papermaking process is not properly controlled, the surface strength of the paper is poor, and the phenomenon of powder dropping, pulling and peeling is likely to occur during the printing process. It even caused chain faults such as stacking, stacking, erasing, stencil printing, and reducing printing rate of printing plates. The main reasons for the generation of printed powder, napped and peeled paper are as follows: Ink on the blanket touches the surface of the paper. During the imprinting process, the paper surface has a sticky force and a peeling force, and this force increases with the printing speed. . Therefore, when the surface strength of the paper is not good, the faster the printing speed is, the more the paper is powdered off.

After the fact that the surface strength of the paper is not sufficient, the emergency remedial measures at the production site can only be achieved through the adjustment and control of the printing operation technology, so as to reduce or eliminate the phenomenon of powder failure, dusting, and peeling. The main process measures are:

The first is to appropriately reduce the printing speed and reduce the sticking force and peeling force at the time of imprinting;

The second is to appropriately reduce the printing pressure and reduce the impact and peel force on the paper surface;

The third is to properly adjust the viscosity of the ink, to add appropriate ink remover or varnish to reduce the viscosity of the ink;

Fourth, printing is carried out on a small amount of fountain solution as much as possible, avoiding the adverse effects of "great viscosity of water, ink, and ink";

The fifth is to check whether there is aging sticky phenomenon on the rubber cloth. If there is some shape, a layer of sulfur powder should be coated on the surface of the blanket. If this method is invalid, a new blanket should be replaced;

Sixth, by using a paper-hanging machine to hang the paper, some paper scraps on the paper surface can be scattered by the rotation and blowing of the machine.

Seventh, emptying the paper once to make the paper flour fall off;

Eight is to adjust the paper used for printing less ink-absorbing surface to the paper with poor paper surface strength to ensure product printing quality.