ECOLOGICAL SUSTAINABILITY OF THE SHEETFED OFFSET PRINTING

The basic directions of the ecological sustainability of the sheet fed offset printing are in the area of the application of the renewable and recycled raw materials for the production of the printing materials, in the decrease of the energy consumption, the usage of the energy from the renewable sources and in the production without waste; or if the waste was formed that it could be used in the same production or in another one. The analysis of the life cycle assessment offset printed matter has shown all the importance of the recycled paper usage in relation to the usage of the paper made from the virgin fibres and with it the possible influence on the quality of the environment. The main object of these investigations is the contribution to the explanation of the mechanism of the deinking flotation of prints made with the ink based on mineral oils and prints with greater share of the renewable raw material. Some prints were exposed to moist heat ageing before recycling. The brightness of handsheet, number and area of specks and chromatic coefficient in relation to the ink formulation and the conditions of the moist heat ageing of prints are discussed.