Offset sublimation ink for offset printing process, string roller move from left to right, in this process, the transmission speed from the leftmost to zero, and gradually increased to the maximum, and gradually reduced to zero in the rightmost, and from the rightmost zero to maximum speed in the opposite direction, then reduced to the leftmost zero.

String roller is from one reversing point to the maximum, and then to another reversing point, plate cylinder should turn around, string roller roundtrip string action. Rotational speed variation can be described by a sine curve. The higher the speed of axis string, the better ink distribution, obviously, the effect is good in the middle of string ink, thus, printing process as far as possible to make demanding parts place the middle of the alignment of string ink roller, the string roller commutation point can only be aligned with the non-printing parts of the plate cylinder.