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Tuesday, 17 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Lignin enchances the linerboard coating world

Thursday, 10 January 2013

Lignin- the magic word for the sustainable replacement of fossil oils. Again it shows its performance together with arabic gum, starch and carrageenan above our heads.

Lignin is a good substitution of commercial wax coatings

Source: jbei-Joint BioEnergy Institute

Lignin is a good substitution of commercial wax coatings

Source: jbei-Joint BioEnergy Institute

 Danupong Narapakdeesakul and his colleagues from Prince of Songkla University in Thailand used lignin extracted from oil palm empty fruit bunches (OPEFB) to prepare a linerboard coating.

Therfore they mixed 5 % (w/v) lignin into oxidized starch solution.The researchers investigated then the effect of the type (arabic gum, carrageenan and guar gum) and concentration (1–5 %, w/w of lignin) of stabilisers on the coating characteristics and properties of coated linerboard.

Results show that an alternative to commercial wax coatings is found

The viscosity and stability of lignin-based coatings were improved with the addition of stabilizers. Ligninbased coatings containing arabic gum were found to be more stable than carrageenan and guar gum, even though they had meager viscosity. The linerboards coated with ligninbased coatings consisting of 1–3 % of arabic gum and 4–5 % of carrageenan provided lower water absorption than others. These conditions showed similar water absorption to linerboards coated with commercial wax coating.

The type and concentration of stabilizers in this study did not affect the ring crush and bursting index of coated linerboards, and had little effect on the tensile index when a higher concentration (>1 %) of stabilizers was applied. The results showed that the addition of 1 % arabic gum into lignin-based coating provided good coating characteristics and properties of this coated linerboard were similar to commercial wax coating.

This study indicated that OPEFB's lignin can be exploited for the production of coating for linerboard as an alternative to commercial wax coating.

The results are published Progress in Organic Coatings, Volume 76, Issues 2–3, February–March 2013, Pages 482–487.

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