Jonathan Cullen
Technologies for the Reuse of Printed Paper in the Office
Jonathan Cullen
Technologies for the Reuse of Printed Paper in the Office
| Climate change gas emissions from the paper industry are significant and growing.Global production of cut-size papers in 2001 alone will result in 100 million tonnes of carbon dioxide equivalent emissions; emissions are projected to increase 10-fold over the next 50 years.Potential exists to reduce emissions from cut-size papers through the reuse of printed paper in the office.Creative thinking techniques were used to perform a broad based search for reversible printing technologies (those which allow for repeated printing and un-printing of paper).The result was a Catalogue of Reversible Printing Ideas, prioritised according to their re-print potential. A programme of experimentation was undertaken to: measure contrast removal from a range of print/paper combinations, optimise the removal process and assess the re-print potential of promising combinations.Contrast was removed using an existing abrasion method and a newly designed scraping technique.Results show significant variation in contrast removal across the print/paper combinations (10% to 100% for abrasion and 12% to 98% for scraping).The microporous absorption layer in photo-paper was found to be abraded sacrificially producing exceptional unprinting results.Toner print was completely removed from transparency film using the scraping mechanism; five re-print cycles were achieved with no visible damage sustained to the film.This rivals conventional offsite recycling techniques. Experimental results show that a technology for the reuse of printed office paper is still technically feasible.Further research should seek to develop a demonstration-level desktop-machine for use in the office. |