Trapping is the most common of several processing methods
trap also known as trap, also known as scalability, largely to compensate for caused by printing misregister white leakage between the two adjacent colors.
when people face when printing, always feeling dark eyes, light far from human eyes, so when trapping in the original manuscript, always managed not to let the dark under the light show, and dark above remains the same, without compromising the Visual effect.
trapping the principle
application of trapping must follow certain principles, generally under the expanded color expansion color, spread light non-dark, and spread flat screen does not expand the field of meaning. Sometimes also spread to each other, to reverse trap special cases, and even to make up for the gap between the two adjacent colors printing error, so that the printed appearance.
trap size according to the printer properties and printing depending on the accuracy of the system. Offset amount of trapping smaller, gravure and flexographic printing to large amount of traps, usually in the 0.2-0.3mm, can according to customer the printing precision, or depending on the requirements.
common trap handling methods
has 4 main types of common methods of trapping.
(1) method of monochrome line overprint: in blocks of color and light on the side lines, and line properties selected for overprint.
(2) synthesis method: in color blocks and synthetic lines. line property is not selected as the overprint.
(3) layered method: by elements in the different layers within the shrinkage or expansion to achieve a trap.
(4) shift: by moving the color swatch in the inflection point location within the shrinkage or expansion, generally used in a gradient-related traps. Trapping
white/> in the plastic packaging and printing white ink is widely used. In transparent or translucent plastic printing in General, needs to do with white bottom, and sometimes hold two layers of white. Expose color swatch below for preventing misregister white, before printing, consider a white back.
1. white on the back according to their colors, or the customer's requirements, back amount is generally 0.2-0.3mm.
2. beneath if the color block next to the white and transparent, the white to the color blocks in the back 0.3mm.
3. black gold beneath white when white can back to the black and gold 0.5-1mm.
4. If color is lighter in color or light NET, white back amount to little or no retraction. Such as when the color of the dot in 30% a 50% when the white back amount is 0.15mm; and when the color of the dot is less than 30%, white may not be retracted.
5. When asked under the gradient pattern white when white diagonal back should be considered. Blue gradient beneath white, cyan deep white-back 0.2mm, cyan light where white-back 0.1mm, inflection point shift method is now available.