How to trap traps in gravure plate

In the gravure production process, the most prone to problems is the appearance of a white edge at the overlap of color and color. There are many reasons for this phenomenon. Since most gravure presses are high-speed rotary drums, under the influence of tension, the substrate will inevitably produce tensile deformation. Therefore, we should take corresponding measures in the early computer production. Measures to reduce problems that may occur when printing.

In order to avoid printed edges, we used two methods: 1 Overprinting with 100% black; 2 Trapping at the junction of two colors. Trapping is one of the most commonly used methods. In other words, trapping can be said to be the most important technology in concave printing plates, and it is also the most important issue to pay attention to. To make traps, a gravure printing plate is equivalent to doing a good job. Mostly. The so-called trapping, generally speaking, is to fill in the white edge of the place, with color complement. But there is a principle of what color to use, this principle is from shallow to deep: white, yellow, green, magenta, red, blue, black. This must be remembered.

For example: A yellow pentagram is pressed against a blue base. The yellow pentagram should be slightly enlarged, that is, a 0.2 mm green border should be added at the color junction. However, because the green edge is expanding inwards and outwards along the edges of the five-pointed star, we need to add an original large, yellow, five-pointed star on the green-edged five-pointed star. This is equivalent to the fact that we will turn the yellow of the five-pointed star outward. Expanded by 0.1mm.

But if the blue star is in turn pressed against the yellow bottom, then according to the principle of shallow depth, we should expand the yellow background into the pentagon. Then the 0.1mm green edge should be placed inside a blue pentagram. You can first cut off the star with a green edge, and then select the original blue star to paste inside, which is equivalent to we expand the yellow inward 0.1mm.