Original is the basis of printing. For corrugated boxes that use Flexography, the design of original has the following requirements.
(1) During the printing process, due to the difference in ink volume and pressure required for large areas and small details such as text, fine lines, and dots, even if their colors are the same, they should not be placed on the same printing plate, and should be printed separately.
(2) When conducting full plate printing on corrugated cardboard boxes, in addition to the compression effect of the embossing roller on the corrugated cardboard, the ink also has a wetting effect on the paper surface, which reduces the compressive strength of the corrugated cardboard box. Therefore, full plate printing should be avoided.
(3) It is not advisable to overprint two color blocks of the same shape and size to avoid inaccurate overprinting. Local overprinting of text, patterns, or small color blocks should be done on larger solid color blocks.
(4) Avoid designing wide and long bars and solid surfaces along the axial direction of the printing plate drum, as this can cause machine vibration; In addition, it is necessary to avoid strip patterns with the same direction as the corrugated cardboard, otherwise printing pressure will crush the corrugated board and cause the cardboard box to break.
(5) When designing a layout, large circular patterns should be avoided, otherwise the printing pattern will become elliptical due to the elongation of the flexplate along the circumference.
(6) For Yin characters, especially small characters, it is necessary to consciously thicken the strokes to avoid thinning or even dying due to ink spreading during printing.
(7) Generally speaking, text with an area less than 2cm2 cannot be seen clearly at a distance of 5cm, and for corrugated box printing, it loses the significance of promoting and promoting products. Therefore, it is important to avoid using too small text when designing.
(8) Avoid precise overprinting with tight seams. The two-color overprint area generally needs to be subjected to a 0.1-0.2mm trapping treatment to avoid white exposure when overprinting is poor.
(9) Try to reduce the number of overprinting times, usually below 3 colors. The more overprinting times, the more severe the decrease in compressive strength of corrugated boxes. Practice has shown that after monochrome printing, the compressive strength of corrugated boxes decreases by 6% to 12%, while after tricolor printing, the compressive strength of corrugated boxes decreases by 17% to 20%.