izvorni znanstveni rad
The process of paper recycling changes the properties of cellulose fibres. The fibres become harder, More brittle, less flexibile and fragile. Their swelling ability is also reduced. These changes reduce the contact surface and weakens the hydrogen bonds between the fibres in recycled paper. Paper recycling takes place in several phases, the most important of which is the process of deinking. This is particulary important in the production of recycled printing paper. Deinking is a process by which the particles of printing ink are removed from the pulp, i.e. from defibrated prints. Due to the fact that in every printing technique the ink adheres in specific way to the substrate, the deinking process for various types of prints can have a different outcome. Chemical deinking flotation, along with particles of ink, exctracts a certain amount of fibres and fillers from the pulp. With respect to the optical properties of recycled paper the efficiency of deinking directly affects quality. The aim of the study is to determine whether the extraction of certain quantities of fillers from the pulp influences the mechanical properties of recycled paper. To this effect, we expect that the test of tensile strength to tear and bursting resistance of handsheets from offset and digital prints will provide some answers.
recycled fibres; mechanical properties; tear; tensile; burst
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