Different characteristics of the offset lithography and flexography, offset lithography color box design is different, turn the offset to flexo, in addition to the four basic colors, often with one or two spot colors, therefore, most customers are equipped with six groups.
If added glazing function (the same structure with the printing unit),there will be seven groups of printing units. Although there is no limit to the number of servo drive on the printing group, but in general, customers with the 6+1 can meet the demand, so we have the highest with eight colors.