A new method for troubleshooting the tipping angle

Our two-color Heidelberg offset press made four-color and four-color printing. After the yellow and black inks were printed, the red and blue stamps were printed. It was found that the corners of the upper right corner dragging were severe, about 0.4 mm. After analysis: The main reason is that when printing yellow or black, the water is not uniform, relying on the water is too large, causing the paper to absorb too much water, caused by the deformation of the stamping. Can only be remedied now, if the pattern allows, generally half of the way to print half the way to deal with, but doing so, due to inconsistent paper deformation, it is not very ideal overprint, and the second printing, waste of man-hours.

This time, we took another approach that worked well. The specific method is to place a paper with a width of 4cm, a length of 20cm, and a thickness of 2.5cm on the inner side of the paper at the front position of the front gauge (a stack of paper is generally used to make the paper) and put it on the paperboard. Above, cut a piece of PS to make a paper, guide paper, in addition to the front gauge at the pressure of paper (note that the paper can not have a blocking head to ensure that the paper can pass smoothly). If the tip is pleated, the paper can be thinned appropriately. In this way, the tail of the inner paper is arched, and the edge of the paper is slightly delayed. When the paper is imprinted, there is a tendency of inward closing at the inner tip of the paper, so that the inner paper is slightly shrunk and deformed. The error of overprinting in the test print is obviously reduced, and it meets the printing requirements. If the peer encounters such a situation, it may try.