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As we all know, plastic film is one of the important flexible packaging materials. In high-molecular polymers, the arrangement of macromolecular chains, segments or crystallites is disordered and anisotropic without external force. When subjected to external forces such as tensile stress, the macromolecular chains, segments or crystallites are arranged in an ordered manner along the direction of the external force, resulting in different levels of orientation and forming an oriented structure. However, after orientation, the polymer appears anisotropic due to the difference in force between atoms in the orientation direction and the non-oriented direction, resulting in the properties of the material in the orientation direction, such as modulus, strength, and refractive index, being significantly different than before orientation . Therefore, for the finished film, due to the different degrees of longitudinal and transverseerorientation represents a quite different result of the tensile test. Today we present the tensile test on several plastic foils.
This experiment was exposed to the environmental conditions according to the National Standard for Adjusting and Testing the Shape of Plastic Specimens for 4 to 8 hours, and the test was carried out with a 0.5 degree tensile testing machine manufactured by became our company and according to the corresponding data curve gets its different characteristics.
1. BOPP film
The BOPP film tensile test uses the cutting method to prepare the sample. (15 ± 0.1)mm long strip, the distance between the clamps is 100mm, the test speed is (250 ± 25)mm/min, conduct longitudinal and transverse tensile tests respectively, and draw the tensile curve as shown in Figure 1.
Figure 2 Tensile strength curve of a CPP film (thickness: 25 μm)
Figure 4 Tensile strength curve of BOPET film (thickness: 25 μm)
It can be seen from Figure 4 that the shape and value of the longitudinal and transverse curves of the BOPET film are similar and the initial tensile force increases rapidly up to to a clear inflection point, and then the tensile force decreases linearly with the increase in tensile elongation; the curve shape is smooth and straight, showing fluctuations in tensile force, indicating that the material performance is relatively balanced.
Wuhan Guoliang Instrument is a tensile machine manufacturer specializing in the production of electronic tensile testing machine, universal tensile testing machine and other testing instruments. Test materials include: rubber , plastic, metal, geotextiles, etc. Welcome to the consultation!
