Skc Co., Ltd.

Skc, Inc.

Sk Microworks Co., Ltd.

Sk Microworks America, Inc.

Microworks America, Inc.

Joo Ho Yang

Chul Kyu Kim

Eugene Jung

Yong Deuk Kim

Hyuk Soo Lee

Jung Kyu Lee

Yongdeuk Kim

Jaehyong Son

Yong Duck Kim

Chui Kyu Kim

Dae Yong Shin

Seung Kyun Kim

Embodiments relate to a polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate (PET) container using same, the crystallization temperature (Tc) of the polyester film is not measured or is 70° C. to 130° C., as measured by differential scanning calorimetry, whereby it is possible to easily control the crystallinity. Accordingly, the polyester film has excellent shrinkage characteristics and recyclability, and clumping rarely occurs even if it is dried at high temperatures for a long period of time in the regeneration process.

Polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate container using same

The embodiments relate to a polyester film, which comprises a copolymerized polyester resin comprising a diol component and a dicarboxylic acid component and has a heat shrinkage rate of 30% or more in the main shrinkage direction upon thermal treatment at a temperature of 80&#xb0; C. for 10 seconds and a melting point of 170&#xb0; C. or higher as measured by differential scanning calorimetry, which not only solve the environmental problems by improving the recyclability of the polyester container, but also are capable of enhancing the yield and productivity, and a process for regenerating a polyester container using the same.

Polyester film and method for reproducing polyester container using same

The embodiments relate to a polyester film, to a process for preparing the same, and to a process for regenerating a polyethylene terephthalate (PET) container using the same. The polyester film has excellent seaming characteristics and recyclability by virtue of controlled crystallinity, whereby clumping rarely occurs even if it is thermally treated for a long period of time in the regeneration process.

Embodiments relate to a polyester-based film and a process for regenerating a polyester-based container using the same, which not only solve the environmental problems by enhancing the recyclability of polyester-based containers but also are capable of enhancing the quality, yield, and productivity. When the polyester-based film is cut into a size of 1 cm in width and 1 cm in length, immersed in an aqueous solution of sodium hydroxide (NaOH) having a concentration of 1% by weight, and stirred for 15 minutes at 85&#xb0; C. at a speed of 240 m/minute, the average particle size of the component of the printing layer separated from the base layer satisfies 15 &#x3bc;m or more. Thus, it is possible to enhance the quality of the regenerated polyester-based chips produced from the polyester-based container provided with the polyester-based film.

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&#xb0; C. to 220&#xb0; 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 (&#x394;a) before and after the heat-shrunken polyester film is dried at 210&#xb0; C. for 90 minutes is 1.50 or less, or the amount of change in Col-b (&#x394;b) before and after the film is dried at 210&#xb0; C. for 90 minutes is 1.50 or less.

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

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Gyeonggi-do, South Korea

Joo Ho Yang