Screen printing on cotton fabric using chitosan and alginate as natural thickening agent

[EN] In the process of making a print on a fabric, several steps that require many materials and substances are involved. When the purpose is to create a pattern through the use of natural products, it is necessary to pay close attention, not only to the origin and method of extraction of the pigments that you intend to use, but also, for example, to the thickeners to be added to the paste for increasing the viscosity of the pastes and molding, to the stains to be applied for better color rendering on the fabric and to the final fixatives, designed to make the product durable. Thickeners are a fundamental step in the success of printing on fabrics. These agents are generally compounds with a high molecular weight whose task is to transfer to the fabrics the dyes and chemical compounds necessary to create the printing pattern, thanks to the plastic action that they give to the compound used. As far as the environmental consequences of the use of thickeners are concerned, starting from the analysis of the wastewater of the processes, it has emerged that the use of biodegradable additives and guar rubber on the fabrics is preferable, since they are less harmful to the ecosystem. In this work different natural compounds, chitosan and alginate, are used in order to increase the viscosity of the paste prepared for printing. Color measurement of each printed cotton simple was analized and it could be appreciated that alginate paste printed on pretreated fabric with chitosan reached good results.Rondanini, S.; Díaz-García, P.; Montava-Seguí, I.; Gisbert Paya, J.; Bou-Belda, E. (2020). Screen printing on cotton fabric using chitosan and alginate as natural thickening agent. Annals of the University of Oradea: Fascicle of Textiles, Leatherwork. 21(2):77-80. http://hdl.handle.net/10251/165395S778021

Estampación sostenible con colorantes naturales

[ES] La tendencia de los productos sotenibles y basados en compuestos naturales está cada vez más extendida y es aceptada por la Sociedad. En este Proyecto se pretende desarrollar formulaciones de estampación de productos textiles basados en compuestos naturales. Las recetas de estampación se compondrán de bio-productos partiendo de colorants naturales y contemplando la presencia de diferentes espesantes. Se evaluará la eficacia de la pasta de estampación, la definición de perfiles y se comparará la solidez de los estampados para determinar la formulación que ofrece mejores resultados.[EN] Nowadays it is widely know the tendency to accept bi-based prducts. The purpose of this project is to develop some recipes to print fabrics with natural dyes. The ingredients would be bio-based, not only the dyes but also the thickener and auxiliaries. The efficiency of the printing paste will be characterized. Color fastness and the silhouette will be also studied.Rondanini, S. (2019). Bio based printing with natural dyes. http://hdl.handle.net/10251/129058TFG