Environmentally Aware Printing – Dealing with the stickies problem Part 2
Sunday, February 28th, 2010Environmentally Aware Printing – Dealing with the stickies problem – Part 2 – 1st March 2010
A number of factors, both chemical and physical, influence the solid. Colloidal content in the system. Increasing agitation during pulping will increase the colloidal particle concentration and reduce solid particle size, thus making effective screening more difficult. A similar situation may occur when pH is raised during the de-inking process.
Low attrition systems, utilising a much lower shear pulpling stage, will obviously favour products which can be effectively removed by screening. This type of system is commonly employed in the more modern European mills and is increasingly accompanied by a closed loop water recirculation system. These are becoming more prevalent as a result of tighter restrictions on disposal of contaminated water. Within the recirculation system problems with dispersed particle concentration may develop over a period of time causing saturation, agglomeration and possible formation of secondary stickies. In these cases, efficient screening of adhesive particles is preferred.
Stickies can potentially cause problems both at the wet end and dry of the paper machines where they may build up on forming fabrics, the press section, calendars, blades and drying cylinders. This leads to recued efficiency, web breaks and regular cleaning necessitating costly downtime.
Peter Harrison is Joint Managing Director of The Printing House Ltd, and Print Buying Direct of Crewe, Cheshire, UK.
NEW: We now sell Large Poster Printing online (A1 Posters, A0 Posters etc) and Banner Stands
Also – checkout our new online print prices Print Buying Direct are UK market Leaders in Leaflet Printing | Brochure Printing. For more free articles on Printing and Graphic Design see our Online Printing | Print Buying Direct Website. For more information on printing and graphic design please see some of our recent blog articles;
- Environmentally Aware Printing – Dealing with the stickies problem – Part 1
- Environmentally Aware Printing – Definition of recyclability of Adhesives
- Environmentally Aware Printing – Inks | Adhesives | Bookbinding adhesives
- Environmentally Aware Printing – Adjusting to alcohol free printing
- Environmentally Aware Printing – Alcohol free benefits
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