The performance of PET film-technical knowledge

The performance of PET film Source: Protective film factory direct sales Release time: 2019-03-07 Click: 2994 PET resin can be processed into various bottle containers, sheets and films. Among them, the largest application market of PET film is flexible packaging composite materials, accounting for about 50% of the total consumption. Due to the excellent comprehensive properties of PET film, it is more and more widely used in flexible packaging and other fields. (1) It has good mechanical properties, its tensile strength is 9 times that of PE film, it has good rigidity, stiff, and flexural resistance; (2) It has good gas (oxygen, carbon dioxide and water vapor) barrier properties, which is a medium barrier. Materials; (3) Good optical properties, good transparency and high gloss; (4) Wide operating temperature range (-60-120℃, up to 150℃ in a short time); (5) Excellent electrical insulation performance, belonging to E Grade insulating material; (6) Odorless, tasteless, resistant to grease and general chemical corrosion; (7) PET is an environmentally friendly material, which can be recycled and reused. In short, the comprehensive performance of PET film is excellent, but there are some shortcomings: ① Ordinary polyester film cannot be directly heat-sealed; ② Barrier property is not too ideal; ③ Heat resistance is not high enough; ④ Transparency, gloss The degree of film for special purposes needs to be further improved; ⑤ not resistant to ultraviolet radiation; ⑥ not resistant to hydrolysis; ⑦ unable to meet the requirements of some special functions, such as flame retardant, antistatic, etc. With the continuous development of the national economy and the increasing improvement of people's living standards, the requirements for packaging materials are getting higher and higher. For example, it is required to have high barrier properties, high heat resistance, high light transmittance, high gloss, low haze, anti-ultraviolet radiation, flame-retardant, heat-sealable, meet food hygiene requirements, and so on. Obviously, ordinary PET film can no longer fully meet these requirements, so it is necessary to modify PET from different angles according to different fields of use.