Polyester film and method for reproducing polyester container using same

Abstract

The embodiments relate to a. polyester film and a process for regenerating a polyester container using the same, which not only solve the environmental problems by improving the recyclability of polyester containers, but also are capable of enhancing the yield and productivity. The polyester film comprises a first layer comprising a first resin comprising a diol component and a dicarboxylic acid component; and a second layer laminated on one side of the first layer and comprising a second resin different from the first resin, wherein when the polyester film is cut with a polyethylene terephthalate container to form flakes and the flakes are thermally treated at a temperature of 200° C. to 220° C. for 60 minutes to 120 minutes, the clumping fraction is 8% or less.

Description

TECHNICAL FIELD[0001]Embodiments relate to a polyester film and a process for regenerating a polyester container using the same, which not only solve the environmental problems by improving the recyclability of polyester containers, but also are capable of enhancing the yield and productivity.BACKGROUND ART[0002]As concerns about environmental problems have increased in recent years, there is a demand for addressing the recycling issues of products fabricated using thermoplastic polymers. In particular, polyethylene terephthalate, a thermoplastic resin having excellent properties in terms of thermal resistivity, processability, transparency, and non-toxicity, has been widely used for producing a wide range of products such as films, fibers, bottles, containers, and the like, and efforts have been made to improve the regeneration rate thereof.[0003]In general, a polyolefin stretch film or the like is attached to a container produced from polyethylene terephthalate as a label. Thus, o...

AI Technical Summary

Benefits of technology

The patent describes a polyester film that improves the recycling of polyester containers and increases efficiency and productivity. The film is also economical because it does not require an extra step of separating the container and film.

Problems solved by technology

However, there has been a disadvantage in that the films are not completely removed even after the above steps; and that the regenerated polyester chips are colored due to the inks contained in the film, or they are non-uniformly clumped during the thermal treatment thereof.

However, the low specific gravity thereof cannot be effectively achieved due to the ink layer, which makes it difficult to completely separate the films, and the problem that the residual ink colors the regenerated chips cannot be solved.