Toyobo Co., Ltd.

Hiroko Maruyama

Masayuki Haruta

Shintaro Ishimaru

Tomoyuki Hashida

The present invention provides a polyester-based film for keeping freshness, comprising a polyester-based resin layer comprising, ethylene terephthalate as a main component, wherein the polyester-based film satisfies the requirements (1) to (4); that can extend the shelf life of the contents such as fruits and vegetables when using as a packaging bag, increase a commodity value, and re-close even after the packaging bag opened.

Polyester-based film for keeping freshness and packaging bag

The invention provides a sealant film that is less likely to adsorb components formed of various types of organic compounds, has excellent heat sealing characteristics at 140&#xb0; C., while having low heat sealing strength at 100&#xb0; C. and being less likely for heat sealing layers to adhere to each other even when the film is used as a packaging bag and the content thereof is warmed in boiling water. The sealant film has at least one heat sealing layer consisting of a polyester component, wherein a heat sealing strength of the heat sealing layer being heat sealed to another heat sealing layer at 100&#xb0; C. and 0.2 MPa for 2 seconds is 0-5 N/15 mm and at 140&#xb0; C. and 0.2 MPa for 2 seconds is 8-30 N/15 mm, and a film density including all layers is 1.20 or more and less than 1.39.

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Tsuruga, Japan

Hiroko Maruyama