Method for reproducing polyester container and polyester film used in the method

Abstract

Embodiments relate to a process for regenerating a polyester container and a polyester film to be used therein, which not only solve the environmental problems by improving the recyclability of polyester containers, but also are capable of enhancing the quality, yield, and productivity. The process for regenerating a polyester container comprises providing the polyester container and a heat-shrunken polyester film that wraps at least part of the polyester container; crushing the polyester container and the heat-shrunken film to obtain flakes; and thermally treating the flakes to produce regenerated polyester chips, wherein when the flakes are thermally treated at a temperature of 200° C. to 220° C. for 60 minutes to 120 minutes, the clumping fraction is 9% or less, the flakes comprise first flakes obtained by crushing the container and second flakes obtained by crushing the heat-shrunken polyester film, the heat-shrunken polyester film comprises a copolymerized polyester resin comprising a diol component and a dicarboxylic acid component, and the amount of change in Col-a (Δa) before and after the heat-shrunken polyester film is dried at 210° C. for 90 minutes is 1.50 or less, or the amount of change in Col-b (Δb) before and after the film is dried at 210° C. for 90 minutes is 1.50 or less.