engleski

Recycling the prints obtained by varying the voltage in LEP technology

With the development of digital printing technology, the amount of digital prints in waste paper is rapidly increasing. At the same time. It has been difficult to detach the Electrolnk in liquid electrophotography printing (LEP), from fibers with the same deinking processes used for conventional inks. Because of the different characteristics of Electrolnk, it has been difficult to collect, recycle and deink. The prints obtained by varying the voltage of the processing drum, reverse roller and a squeegee roller in the LEP technology on the mechanism and effrciency of the deinking flotation process and characteristics ofthe recycled fibers is presented in these afticle. Research results indicate that by increasing negative voltage of the processing drum and reverse roller an increase occurs in the dirl count on handsheets obtained from fibres after disintegration, while the results related to the squeegee roller are inversely proportional. An increase is observed, specific for each of the stages, in the area of dirt > 0.04 mm'zwith the increase of negative voltage. The range of dirt sizes that can be removed by flotation is restricted to between 0.050 and 0. 150 mm2. Dirt below 0.04 mm2cannot individually resolved, they stili adsorb light and hence contribute a greyness or overall loss of brightness to the handsheet. The paper discusses the inter-dependability of the distribution the size and area of dirt on handsheets obtained from the deinking flotation process with regard to the change in voltage of the processing drum, reverse roller and squeegee roller in printing. The ERIC and handsheet brightness results explain the efficiency of the recycling process well and confirm the results obtained by implementing other methods.

LEP technology ; recycling ; image analysis ; ERIC ; brightness

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