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Natural BiNders world pulppaper 75 The paper industry is changing an era of fresh solutions from a new way of thinking is upon us Binder development for paper board coating is very good example of this change. Several producers are using over 50 natural binder in their formulations and environmental aims have led to targeting the 100 replacement of latex in the coating process. Natural binders can offer a lower carbon footprint a greener image and better recyclability compared to latex. They can help to improve quality parameters as well as lower overall total costs. These incentives are enough to ensure that change does indeed occur. ROQUETTE has offered latex replacement over 10 years with STABILYS binders. They are widely available for even the most demanding of sizing applications and latex replacement in coatings. The new generation has been developed together with substantial customer input the end result of which is now available in the market STABILYS EVO New STABILYS EVO can offer improved results for sizing runnability in the coating process whilst maximising latex replacement in paper board coating. By Olli siiskonen Market Unit Plant-Based Binding Solutions Global Market Manager Graphic Paper and Board Roquette Novel natural binder to improve quality and maximise latex replacement HOwtOimprOVeFilmFOrmiNGiNsurFacesiZiNG Film forming is an important characteristic in surface sizing. Film forming correlates with the dimensional stability printability and process ability of paper and board. Improved film forming can enable the use of less starch in order to achieve at least similar quality parameters or in some cases actual improvements in quality with same amount. It can also decrease the need for silicon or other functional chemicals further on in the process. Surface tension is one good method of analysing film formation. The lower the surface tension the better the spreading of starch film and thus ultimately film formation. Table 1 illustrates surface tension of different starches and their film forming ability. All starches are cooked and diluted to 20 solids content. STABILYS EVO can offer the lowest surface tension of modified starches to be found in the market and the best film forming properties. Results also show that molecular weight of the starch plays a role in film forming. The higher the molecular weight the higher the surface tension is. In addition high molecular weight is also needed to help achieve good surface strength properties. STABILYS EVO can offer both characteristics at the same time excellent film forming without compromising the surface strength. HOw tO decrease mistiNG iN rOd cOatiNG Misting is known to be one of the greatest runnability challenges for film presssize press coating. Misting causes the accumulation of coating colour to machine parts which eventually results in quality defects in the final paper or a production stop due to a web break. A pilot coating study was conducted at KCL in Espoo Finland to decrease misting in the coating process. Earlier studies have confirmed that latex replacement with STABILYS has a positive effect on decreased misting. Internal laboratory studies have also shown improvements to water retention and viscoelasticity of coating colour with STABILYS EVO. This pilot study was therefore needed to confirm the hypothesis. The coating formulations of this pilot coating study can be seen in table 2. All formulations were prepared with Natural binders can offer a lower carbon footprint a greener image and better recyclability compared to latex table 1. Surface tension of different modified starches