Sanpo-yoshi Communication

Printing Column] Misregistration of Foil

I said, "The main reason is that the process is different.

Sales: "Why is there a discrepancy if the process is separate?"

I said, "Paper expands and contracts, so even if it is in that position when printed, it may not be in the same position when foiled.

Paper is a mass of pulp fibers. And pulp fibers become larger when moist and smaller when dry. It also has characteristics such as stretching when pressure is applied. Therefore, the situation of pre-printed paper is also different between the topmost paper and the bottom paper.

The upper paper is more sensitive to moisture and less sensitive to pressure.
The paper at the bottom is less sensitive to moisture but more sensitive to pressure.

The order of printing is reversed when the printing is finished, since the printing is done from the top paper first. 0.1% expansion and contraction of 650 mm x 950 mm paper results in a little less than 1 mm expansion and contraction, which can lead to a total variation of ±0.5 mm, or nearly 1 mm, due to variations in expansion and contraction size. In the case of press coating (equipment that uses heat and pressure to produce luster), the size can vary by as much as 3 mm.

Therefore, even if the foil position is the same, the printing position will change.

Therefore, what is important is the design and processing method. Since expansion and contraction of paper is inevitable when paper is used, a method is needed that does not stand out even if the printing and foil do not register with each other due to expansion and contraction.

The risk of problems changes with the design and process, and we are dedicated to avoiding many problems in advance.