Chemical recycling of PET flakes into yarn

Abstract

Polyesters such as polyethylene terephthalate are widely used in textile fibers, films, and packaging of food and beverages. Originally driven by environmental reasons, recycling of postconsumer polyester bottles into textile fibers is now becoming commercially attractive. We studied the chemical recycling wherein part of the virgin raw-materials during preparation of polyester was replaced by washed post consumer polyester. During the process, the postconsumer polyester undergoes partial depolymerization before repolymerization. Role of reactoragitator configuration in achieving the solid-slurry and solid-melt mixing, and in depolymerization, was studied. Finally, suitability of the polymer for melt spinning and drawing of polymer into yarn was examined. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: [520][521][522][523][524][525] 2012

Polyester Recycling—Technologies, Characterisation, and Applications

“…A literature survey shows that molecular weight converges to the fact that there is a decrease with increase in percentage of recycled PET, intrinsic viscosity drops due to thermal degradation, and recycled polymer viscosity decreases with the increase of COOH groups. Upasani et al (2012), Pawlak et al (2000), Lee et al (2013), and Koo et al (2013) have studied the blending of recycled PET flakes with virgin PET chips.…”

Environmental Implications of Recycling and Recycled Products

“…Upasani et al (2012), Pawlak et al (2000), Lee et al (2013), and Koo et al (2013) have studied the blending of recycled PET flakes with virgin PET chips. Recycled PET is characterised by molecular weight, intrinsic viscosity, carboxyl end-group content, colour readings, thermal stability, and so on.…”

Determination of the residence-time distribution in industrial dryer for the production of recycled polyester

“…Polyester (PES) fibers are polymers with identical chemical structure to polyethylene terephthalate (PET) and have several applications in the textile industry. Given the similarity between the physicochemical properties of PES and PET, it becomes possible to transform the recycled PET materials into PES [1][2][3]. Initially, the PET bottles are decontaminated and reduced to the granulometry of flakes.…”