Environmentally Aware Printing – Types of Adhesives (continued)
Monday, March 15th, 2010Environmentally Aware Printing – Types of Adhesives (continued) – 16th March 2010
Future work
In the short term in Europe emphasis will be given to approving and commissioning 100% filterable hot melts in order to minimise problems at the mill and maintain/ improve finished product quality. The only product found to meet all the requirements currently is the reactive hot melt already described.
This, of course, does not give us a truly recyclable adhesive but it allows the finished product to be recycled in a ‘safer’ fashion and at the moment this is regarded as a step forward.
Research into the area of dispersible products will continue but this work needs to take a somewhat new direction with the increasing popularity of closed loop systems and restrictive disposal legislation. A water-dispersible product must be 100% dispersed in the pulping system and be carried through to the finished paper with 100% retention on the fibres, without any detrimental effect on paper properties. In fact, the ultimate goal would be to incorporate the adhesive into the paper to give some positive benefit. The adhesive may then be considered totally recyclable. Looking at the alternative definition of recyclable given at the start if this paper, re-use of the adhesive should be investigated; not necessarily as the same adhesive as a binder or filler.
To be continued…
Peter Harrison is Joint Managing Director of The Printing House Ltd, and Print Buying Direct of Crewe, Cheshire, UK.
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- Environmentally Aware Printing – Types of Adhesives (continued) – 11th March 2010
- Environmentally Aware Printing – Types of Adhesives (continued)
- Environmentally Aware Printing – Types of Adhesives (continued)
- Environmentally Aware Printing – Types of Adhesives – part 3
- Environmentally Aware Printing – Types of adhesives – part 2
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Test methods
Evaluation of the degree of stickie contamination in waste paper stock has been subject of much debate in the past and a vast array of different testing techniques exists and is used. These techniques can be generally divided into four categories:
? Peel tests – measuring the force required to separate stickies and fibres.
? Extraction methods – using solvents and a weight determination.
? Hand sheet inspection methods – visual and instrumental number checks.
? Tack tests – measuring stickie tackiness and stickie/ fibre bond strength.
Apart from physical examination of stickie entities, their effects on paper properties are also of importance, utilising tests such as strength, ash content, smoothness and density, oil and water absorbency and surface analysis (contact angle/ wettability).
Results from all these tests and others define the quality if the finished product and ultimately determine application areas and value of the product.
