Avoid Wedding Paper Bag Color And Moire

Avoid Wedding Paper Bag color and moire

We all know that in the process of color plate making, the Angle of the network cable should be determined according to the primary and secondary of the original color (tone). Because the 45° Angle has a special sensitivity to the human line of sight, the main color plate of the original manuscript is made into a 45° Angle, and the other color angles are set at 15°, 75°, and 90° in turn. In the printing and restoration process, the dot and the dot are crossed at different angles to form a variety of patterns, of which the cross pattern is the best color effect, followed by the mitre pattern. When the four-color plate making group pattern, only the strong colors black, blue and red can form a pattern, and yellow is a weak color, which can not play the role of the group pattern, and only plays the role of color change.

Therefore, when determining the Angle of four-color network cable in plate making, the Angle difference of the three strong colors of black, blue and red should be made into an interval of 30°, which is conducive to the color effect, and can prevent the difference of 15° of the color network cable, causing the occurrence of moire fault.

Even if we choose the above colored cable Angle in plate making, but in the four-color glue machine printing arrangement, if the color sequence arrangement is not appropriate, the printing plate cable Angle of the two adjacent color groups may still be 15°, there is still the possibility of color bias and moire and other defects, but also can not achieve better printing and restoration of the original effect.

For example: landscape paintings are often biased towards blue, in accordance with the principle of the main tone of the original printing plate as 45°, here we set the blue cable Angle as 45°, in turn, the red version is 75°, the black version is 15°, and the yellow version is 90°.

In the four-color offset press printing color sequence according to the first black, after the order of blue, red, yellow to arrange, the adjacent red and yellow version of the difference is 15°, especially in the low-profile area of more than 75°, as long as the paper in the transmission and imprinting process slightly misplaced, it is easy to occur wrong network, causing color bias and MOE spots and other ills.

According to the theory of the primary and secondary of the original color (tone) to determine the Angle of the network cable, as well as the problems that often occur in daily production operations, in order to better solve the problem of color bias and moire on the multi-color offset press, the solution is:

First of all, we should check the source of process design. The process technicians of enterprises and production workshops, after accepting the original manuscript, the primary problem is to determine the 45° network color plate according to the main tone of the original manuscript; Then determine the Angle of the other color plates and the printing color sequence of the four-color offset press.

For example: for the main color of the blue, green landscape painting original, the blue version of the network cable is 45°, the black version of the network cable is 15°, the red version of the network cable is 75°, the yellow version of the network cable is 90°, the color order is first black, and then red, blue, yellow. We believe that in the printing process, the Angle difference of the adjacent two colors networking line is at least 30°, according to the order of the above colored network cable arrangement, the black → red difference of 60°, the red → blue difference of 30°, the blue → yellow difference of 45°, this printing sort can effectively prevent the color bias and turtle grain defects.

Similarly, red accounts for the main tone of the original manuscript, the red plate wind line is set at 45°, the process designer should arrange the red plate in the third color group printing; And the provision of black plate network cable 15°, in the first color group printing; Blue plate cable 75°, printed in the second color group; The yellow network cable is 90°, and it is more suitable to arrange printing in the fourth color group.

It can be seen that the complementary relationship between the above network cable Angle and its color sequence arrangement should be paid attention to by the technical personnel of the enterprise, and through the organic combination of theory and practice, better grasp this law to prevent unnecessary color bias and the occurrence of turtle grain defects.