T/GDEIA 7-2018 Biaxially-oriented Polyester Biaxially-oriented film for ironing purposes

Scope

Scope: This standard applies to bidirectionally stretched polyester films used for laminating tinplate, chrome-plated iron, galvanized iron, and other metal materials. Other film materials can also be used for reference. Main technical content: - Requirements (the product is divided into transparent films and non-transparent films. The technical requirements apply to transparent films, and the requirements for non-transparent films are given separately). - Tensile strength, MPa: - Longitudinal direction: a ≥ 100 - Transverse direction: b ≥ 120 - Elongation at break, %: - Longitudinal direction: a ≥ 60 - Transverse direction: b ≥ 60 - Heat shrinkage rate, %: - Longitudinal direction: a ≤ 8.0 - Transverse direction: b ≤ 8.0 - Coefficient of friction: - Static: less than or equal to 0.65 - Dynamic: less than or equal to 0.55 - Roughness,μmRa: - Roughness: less than or equal to 0.3 - Rz: less than or equal to 3.0 - Haze, %: - Haze: less than or equal to 8.0 - Transmittance, %: greater than or equal to 80 - Glossiness, %: greater than or equal to 120 - Wetting tension, mN/m: - Oxygen permeability coefficient d (at 23°C, relative humidity 0%): [cm3?cm/(cm2S?Pa)] ≤ 2.25×10-15 - Water vapor permeability coefficient d (at 38°C, relative humidity 90%): [g?0.1mm/(m2?24h)] ≤ 6.6 Note: - a: The longitudinal direction is the same as the extrusion direction, i.e., the machine direction. - b: The transverse direction is perpendicular to the extrusion direction. - c: The wetting tension test only applies to corona-treated films. - d: The oxygen permeability and water vapor permeability tests apply to barrier-type polyester films. - For food-contact films, they should comply with GB 4806.7 "National Food Safety Standard for Food-Contact Plastic Materials and Products". - The antimony limit should comply with the provisions of GB 4806.1.

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