Study On Application Of Offset Printing's Ink Transfer

The problem of ink transfer which influencing printing quality has been paid more and more attentyion with the improving of science and technology. To ensure the stability of the ink transfer, the purpose is to study the offset printing's ink transfer, and ascertain the variable technologic parameters about ink transfer and the relationship between each parameter and ink transfer. The basic rules of offset printing's ink transfer were obtained, and the rules are beneficial to ascertain printing technological parameters in offset printing process, and the quality of ink transfer and printing products is improved.In this paper principal technologic parameters affecting offset printing's ink transfer have been acquired by analyzing the ink transfer equation, based on offset printing technology principle. The ink transfer rate was calculated by means of different weights of ink. The impact of each parameter on ink transfer was analyzed by means of ink transfer rate. The influences of every parameter on the ink transfer were obtained by using orthogonal experiment and variance analysis. The models were established by regression analysis.The main technological parameters affecting ink transfer were obtained by analyzing of the ink transfer process. The influencing trend between ink transfer rate and main parameters were obtained through experiments. The functions among printing pressure, printing speed and ink transfer rate were established based on experiments. The relation between ink tack and paper characteristic was analyzed, and the influencing rules were obtained.The results indicate: the influence of ink viscosity is maximal to ink transfer, and the effect of paper's properties is minimal in the main technologic parameters influencing ink transfer. Ink transfer rate is slowly increasing with printing pressure increasing. The relationship between ink transfer rate and printing pressure is cubic. The ink transfer rate reduces with printing speed increasing. The relationship between ink transfer rate and printing speed is conic. In the same printing condition, the transferring properties of 80g offset paper are a little better than 157g coated paper. The ink transfer rate increases along with the ink viscosity reducing. The ink viscosity has the notable impact on ink transfer rate in the certain range. But the influence of ink viscosity on ink transfer rate reduces when ink viscosity drops to the range.