The problem is mainly related to the substrate surface pretreatment. Can by improving the corona processing power and the ratio of air/gas combustion flame treatment, the surface tension of 3.6 x 10-2 n/m. But it’s also the bigger the better surface tension, some ink on the surface tension of 4.0 x 10-2 n/m, also can appear the phenomenon of poor adhesion, thus for different ink should be looking for the best value of surface tension.

 

 

This phenomenon is usually caused by printing pressure is too large. plastic squeeze tubes  Printing on the printing machine has two pressure will affect the quality of the final product’s printing, one is the ink roller pressure on plate, the other one is the pressure plate to the rubber cloth. Pressure is too large, can make by the middle of ink will be squeezed to the edge of the graphic, and make the printing design edge, the phenomenon of the larger zi mo and branch. So must ensure that the printing pressure is moderate.