A Novel Eco-Friendly Scouring and Bleaching Technique of Flax Rove Using Supercritical Carbon Dioxide Fluid

Abstract

A novel eco-friendly scouring and bleaching technique for flax rove was developed using supercritical carbon dioxide fluid. Effects of system temperature, pressure, time, and carbon dioxide flow on the scouring and bleaching properties of flax rove were investigated. The results showed that low residual gum content and significant improvements in whiteness of the flax rove were obtained. The residual gum content and the whiteness were affected by the system temperature, pressure, time and fluid flow. An optimized scouring and bleaching procedure for flax rove was found at a temperature of 120°C, a pressure of 28 MPa, a time of 120 min, and a fluid flow of 30 g/min in supercritical carbon dioxide fluid. In addition, surface morphology and breaking strength of processed flax rove were also evaluated and compared to those properties of the original flax rove samples.

Recent Advances in Environmentally Friendly and Green Degumming Processes of Silk for Textile and Non-Textile Applications

“…CO 2 supercritical fluid (CSCF) can be considered as the CO 2 above its critical temperature (Tc, generally 304.25 K) and critical pressure (Pc, generally 7.38 MPa), under which CO 2 shows some unique properties, such as appropriate viscosity and diffusivity like gas, appropriate density and solvating properties like liquid, making it as solvent candidate so that CSCF can be applied in many fields [28][29][30][31][32][33][34][35][36][37]. In textile fields, CSCF is usually used for dyeing due to its environmentally friendly nature for the replacement of organic solvents or water and easy recovery and recycling [28][29][30], compared with traditional dyeing process.…”

“…In textile fields, CSCF is usually used for dyeing due to its environmentally friendly nature for the replacement of organic solvents or water and easy recovery and recycling [28][29][30], compared with traditional dyeing process. Besides the application in dyeing synthetic or natural fibers, CSCF can also be used for pretreatment of cotton [34,35] and flax fibers [36,37]. However, up to now, little information on degumming of silk using CSCF was reported.…”

Supercritical carbon dioxide (SC‐CO2) dyeing of cellulose acetate: An opportunity for a “greener” circular textile economy

“…Within this context, the development of "waterless" textile dyeing, scouring and bleaching is regarded as significant since it offers a technology platform that completely revolutionises traditional textile "wet" processing. [13][14][15][16][17][18] By increasing the temperature above 31 C and the pressure above 74 bar for carbon dioxide, a supercritical highlycompressed fluid phase is created. 19 The supercritical carbon dioxide (SC-CO 2 ) fluid possesses both the high diffusion properties of a gas, but also the solvation characteristics (ability to dissolve substances) of a liquid and easy movement of CO 2 as dye carrier through the fabric/yarn.…”

“…This “stressed” economic and environmental framework is being further pressured by the current energy‐cost crisis which is focusing the industry to establish new lower temperature, less polluting and more economic dyeing technologies. Within this context, the development of “waterless” textile dyeing, scouring and bleaching is regarded as significant since it offers a technology platform that completely revolutionises traditional textile “wet” processing 13–18 …”

Influence of pilling on the quality of flax single jersey knitted fabrics

“…Apart from the fact that flax fibers are more expensive than cotton, they are superior for obtaining fabrics with good strength (which is additionally improved in wet state 27 ), hygienic, thermal, electrostatic, antimicrobial, anti-allergenic, and UV protection characteristics. [28][29][30] Moreover, thanks to their fine structure, flax fibers are capable of absorbing and desorbing moisture which are the most important contributors to cool handling and comfort, especially in a condition of high temperature and humidity. As a 100% renewable raw material, flax is sustainable, perfectly recyclable, and biodegradable fiber.…”