Coffee Husk Revaluation Analysis as Textile Bio-composite (#126)

Authors

Fonseca, Rosangela

Abstract

In the following research, the behavior of a dry coffee husk bio composite gathered from the revalorization of the pulping stage in the wet coffee process has been studied. The purpose of this research has been to produce a bio composite as a textile material alternative with dried coffee husk as an additive and three components – USP vegetable-grade liquid glycerin as a binder, sodium alginate as a plasticizing polymer and purified water as a solvent; considering the components amounts from another coffee bio composite study, non-related to this research, as a reference. A mixture experiment has been developed with the program Design Expert® in which the mixtures’ ranges have been decided according to the criteria of: less than 25% and more than 75% of the reference study quantities. 20 runs of coffee husk bio composites of 25 g each in molds have been produced. The physical test of weight and the mechanical test of spirality have been carried out on the textile bio-composites before and after a 30-min soaking process with household detergent. The results of the tests have concluded that the bio-composites have lost up to 500 g and the spirality has reached up to 7.69%. The optimal amounts to maximize the results, close to 0, have been: 3.2102 g of glycerin, 1.94 g of alginate, 7.77 g of coffee husks and 12.078 g of water; with a loss of weight of 193.961 g and a spirality of 2.85189% after soaking and drying the bio composite. The results have been statistically significant, but they have required greater statistical control and an analysis of the multicollinearity of the twisting response, since the influence of the independent variables (components) is high.