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1. Mechanical properties
(1) Stretchability
The tensile strength, elongation, elastic modulus and stress at 5% of the PET film. The tensile properties of PET film vary significantly with processing conditions. Generally, the tensile strength of the commercially available biaxially oriented PET film is about 250MPa, the tensile elongation is about 120%, the elastic modulus is about 4GPa, and the F-5 value is about 110MPa.
(2) Viscoelasticity
It shows the viscoelasticity of the biaxially stretched PET film. There are two peaks on the tg8 curve, one is about -50¡ãC and the other is about 120¡ãC. The -50¡ãC peak is due to the ¦Â transition caused by the movement of molecular side chains. The 120¡ãC peak is the a transition caused by the movement of the main chain, which is consistent with the glass transition temperature (T). Due to the molecular orientation, the Tg of the biaxially oriented PET film is much higher than that of the amorphous PET. It is amorphous. The T. of PET is about 70¡ãC.
The strength decreases with the development of biaxial stretching.
(4) Impact strength
The impact strength of the film, biaxial stretching usually increases the impact strength.
2. Thermal performance
(1) Reversible deformation
When the PET film is heated and cooled at a low temperature, the deformation changes to the original size with the temperature change. This deformation is called reversible deformation. The thermal deformation rate is called the "thermal expansion coefficient", and it is usually measured at 65% RH (relative humidity) between 20 and 40¡ãC. The value of the thermal expansion coefficient is closely related to the molecular orientation and the thermal motion of the molecular chain.
(2) Irreversible deformation
When the film is heated to a high temperature, thermal shrinkage occurs and the film no longer returns to its original size, which is called irreversible deformation. The heat shrinkage value is determined by the heat curing temperature and relaxation ratio. The relationship between the temperature of the PET film and the heat shrinkage rate. In general, the higher the molecular orientation, the greater the thermal shrinkage.
3. Optical performance
The refractive index of uniaxially stretched PET film is different in three directions. As the stretching ratio increases, the refractive index increases in the stretching direction and decreases in the thickness direction, while perpendicular to the stretching direction, the refractive index decreases in the initial stage, and then increases with the increase in the stretching ratio. This change is caused by the difference in the degree of plane orientation. The barrier properties decrease with increasing temperature.
4. Chemical resistance
PET film is slightly weaker in resistance to alkali, but extremely resistant to acid. PET film is insoluble in general organic solvents.
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits first. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven types of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a complete set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
Company Address: No. 11, Kaifeng Road, Moling Street, Jiangning District, Nanjing City, Jiangsu Province
Contact number: 025-5183 9686/133 9078 0291
(1) Stretchability
The tensile strength, elongation, elastic modulus and stress at 5% of the PET film. The tensile properties of PET film vary significantly with processing conditions. Generally, the tensile strength of the commercially available biaxially oriented PET film is about 250MPa, the tensile elongation is about 120%, the elastic modulus is about 4GPa, and the F-5 value is about 110MPa.
(2) Viscoelasticity
It shows the viscoelasticity of the biaxially stretched PET film. There are two peaks on the tg8 curve, one is about -50¡ãC and the other is about 120¡ãC. The -50¡ãC peak is due to the ¦Â transition caused by the movement of molecular side chains. The 120¡ãC peak is the a transition caused by the movement of the main chain, which is consistent with the glass transition temperature (T). Due to the molecular orientation, the Tg of the biaxially oriented PET film is much higher than that of the amorphous PET. It is amorphous. The T. of PET is about 70¡ãC.
(3) Spread tear strength
The strength decreases with the development of biaxial stretching.
(4) Impact strength
The impact strength of the film, biaxial stretching usually increases the impact strength.
2. Thermal performance
(1) Reversible deformation
When the PET film is heated and cooled at a low temperature, the deformation changes to the original size with the temperature change. This deformation is called reversible deformation. The thermal deformation rate is called the "thermal expansion coefficient", and it is usually measured at 65% RH (relative humidity) between 20 and 40¡ãC. The value of the thermal expansion coefficient is closely related to the molecular orientation and the thermal motion of the molecular chain.
(2) Irreversible deformation
When the film is heated to a high temperature, thermal shrinkage occurs and the film no longer returns to its original size, which is called irreversible deformation. The heat shrinkage value is determined by the heat curing temperature and relaxation ratio. The relationship between the temperature of the PET film and the heat shrinkage rate. In general, the higher the molecular orientation, the greater the thermal shrinkage.
3. Optical performance
The refractive index of uniaxially stretched PET film is different in three directions. As the stretching ratio increases, the refractive index increases in the stretching direction and decreases in the thickness direction, while perpendicular to the stretching direction, the refractive index decreases in the initial stage, and then increases with the increase in the stretching ratio. This change is caused by the difference in the degree of plane orientation. The barrier properties decrease with increasing temperature.
4. Chemical resistance
PET film is slightly weaker in resistance to alkali, but extremely resistant to acid. PET film is insoluble in general organic solvents.
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits first. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven types of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a complete set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
Company Address: No. 11, Kaifeng Road, Moling Street, Jiangning District, Nanjing City, Jiangsu Province
Contact number: 025-5183 9686/133 9078 0291