Optimizing the technological modes of lamination of digital prints

Abstract

The intensive use of lamination technology for the decoration of printing prints made by various printing techniques, as well as a wide range of films, require solving an urgent problem – optimization of influencing factors to ensure the quality of laminated products. The objects of research were prints of inkjet and laser printing on paper, photo paper, and cardboard. A glossy film based on bio-oriented polypropylene BOPP was used for lamination. Studies of densitometric indicators of prints after lamination confirmed an increase in optical density by 0.28 units. This is especially true for inkjet prints. However, after lamination, all digital prints showed a tendency to improve colorimetric characteristics, namely an increase in the brightness of CMYK colors. The relationship between the technological regimes of lamination (speed and temperature) and the strength of the laminates, estimated by breaking and pressing forces, was established. To describe the dependence of the laminate strength on the temperature and speed of lamination, polynomial models were built that reproduce the values of the breaking and pushing forces of the laminate with satisfactory accuracy. The selected algorithm for calculating the parameter values of these models is based on the application of the Chebyshev approximation of the functions of many variables. The optimization models built will allow, if necessary, for making corrections in the technological process of laminating printing prints to ensure the predicted required quality and strength of laminates.