Citrus-based hydrocolloids:  A water retention aid and rheology modifier for paper coatings, TAPPI Journal July 2019



Application: Due to the high content of pectin present in citrus peel fibers, they have shown excellent control  of rheology in a paper coating system. The industry impacts for this technology include introduction of a green chemical and upcycling of a waste byproduct from discarded citrus peel.

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Author: Preeti Tyagi, Michael Joyce, Sachin Agate, Martin A. Hubbe, and Lokendra Pal
Citrus-based hydrocolloids: A water retention aid and rheol
ABSTRACT: The rheological and dewatering behavior of an aqueous pigmented coating system not only affects the machine runnability but also affects the product quality. The current study describes the use of natural hydrocol-loids derived from citrus peel fibers as a rheology modifier in paper coating applications. The results were compared with carboxymethyl cellulose (CMC) in a typical paper coating system. Water retention of the coating formulation was increased by 56% with citrus peel fibers compared to a default coating, and it also was higher than a CMC-containing coating. The Brookfield viscosity of paper coatings was found to increase with citrus peel fibers. Compared to CMC, different citrus peel fibers containing coating recipes were able to achieve similar or higher water retention values, with no change or a slight increase in viscosity. Coatings were applied on linerboard using the Mayer rod-coating method, and all basic properties of paper were measured to assess the impact of citrus peel fiber on the functional value of the coatings. Paper properties were improved with coated paper containing citrus peel fibers, including brightness, porosity, smoothness, surface bonding strength, and ink absorption.
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