Selection indicators for practicality of tensile testing machine

Since the flexible packaging materials are mainly polymers or related materials, as mentioned above, the elongation of polymer materials is much better than that of metals, fibers, wood, boards and other materials, the tensile machine for detecting polymer polymers is different from the tensile performance detection tensile machine of the usual material. It is especially important to pay attention to the effective stroke of the electronic tensile machine and the sample fixture. The tensile properties of plastics and rubber are one of the important and basic properties of their mechanical properties, which largely determines the use of this type of plastics and rubber. The quality of tensile performance can be detected by the tensile test of the tensile tester.
Tensile properties of polymers Tensile experiments: When used as materials, polymers are required to have the necessary mechanical properties. It can be said that for most applications of polymers, mechanical properties are more important than other physical properties. Polymer polymers have mechanical properties with a wide range of variability in all known materials, because polymers are composed of long chain molecules and molecular motion has obvious relaxation properties.
For example, polymer materials have a very high elongation, and the elongation of breakage of PE is generally between 90% and 950% (of which linear low-density polyethylene LLDPE is relatively high). Through special production processes, the elongation of some materials can be above 1000%, while the elongation of breakage of ordinary polymer materials is mostly between 50% and 100%. Generally, heat shrink films and stretch films require high tensile properties of materials. Tensile experiment of tensile experiment machine: Tensile test (stress-strain test) generally clamps the two ends of the material sample on two fixtures at a certain distance, and separates and stretches the sample at a certain speed to measure the stress changes on the sample until the sample is damaged. Tensile test of tensile machines is one of the widely used methods to study the mechanical strength of materials, and requires constant speed movement. According to the different load measurement methods, it can be roughly divided into two categories: pendulum tensile testing machines and electronic tensile testing machines. Currently, the most commonly used electronic tensile testing machines are used.