Czasopismo | PRZEGLĄD PAPIERNICZY | Rocznik 2011 - zeszyt 5

Lightweighting by rightweighting

nr katalogowy: 59638

The material included in this article is an abridged version of my presentation shown during the latest technical seminar FEFCO, which took place on 23-25.03 2011 in Munich. It is also a continuation of materials on good manufacturing of corrugated board of lightweight papers from 2009. The content is focusing on problems related to increasing wide-scale use of lightweight recycled papers for production of corrugated boards. New quality problems emerge. How to handle them on a corrugator? What characteristics of those papers are the most important? I will try to answer those and other questions, and to present my point of view. The article addresses the following three issues: current trends in the lightweight papers sector how to select papers for lightweight board compositions to maintain the quality of production and strength what must be remembered at a corrugator when converting lightweight papers. Market trends Changes in the market of papers for cardboard production occur very fast. A lower paper weight with its strength maintained means more square meters of produced board. The occurring changes can be summarised in the following way. It can be said without any exaggerations that most of things around us are increasingly “light". Light, slim... thus trendy. The recession, economic crisis and a decrease in consumption did not stop a trend for reducing weights. I would add, it even accelerated. While 10 years ago I considered as lightweight weights below 140 gsm, today the reality is 100 g/m2 and lower. As it can be seen in the Fig. 1 (page 285), the sector of very light papers, i.e., below 100 gsm, both for TL 3 and for WB Fluting, expands in Europe by over 25% a year! Data published by Prism were from the summer of 2010, therefore after the main wave of recession. That is followed by a decrease in an average weight of corrugated boards (Fig. 2 - page 285). When analysing weights of produced boards, Euro[...]

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