How to choose a practical tensile testing machine
The tensile properties of plastics and rubbers are one of the most important and basic properties of their mechanical properties, which largely determine the use of such plastics and rubbers. The tensile properties can be tested by a tensile test.
1. Tensile properties of high molecular polymers
When used as a material, it is required that the polymer has the necessary mechanical properties. It can be said that for most applications of high molecular polymers, mechanical properties are more important than other physical properties.
The high molecular polymer has the widest range of mechanical properties among all known materials because the high polymer consists of long chain molecules and the molecular motion has significant relaxation characteristics. For example, the high polymer material has a relatively high elongation, and the elongation at break of PE generally ranges from 90% to 950% (where the elongation of linear low density polyethylene LLDPE is high), through special manufacturing processes, some materials The elongation can be above 1000%, while the elongation at break of ordinary polymer materials is also between 50% and 100%. Generally, there are heat shrinkable films and stretched films which are required to have high tensile properties of materials.
2. Tensile test of electronic tensile testing machine
Tensile test (stress-strain test) generally involves clamping the two ends of the material sample on two fixtures separated by a certain distance. The two clamps separate and stretch the specimen at a certain speed to measure the stress change on the specimen. Until the sample is destroyed.
The tensile test is one of the most widely used methods for studying the mechanical strength of materials, and it is necessary to use a tensile tester with constant speed motion. According to the different methods of load measurement, the tensile testing machine can be roughly divided into two types: pendulum type tensile testing machine and electronic tensile testing machine. Currently, the electronic tensile testing machine is used more.
3. Electronic tensile testing machine selection index
Since the flexible packaging material is mainly a high molecular polymer or a related material, as described above, the elongation of the high polymer material is far superior to that of metals, fibers, wood, plates, etc., so the tensile machine for detecting the high molecular polymer is used. There is a certain difference between the tensile testing machine and the tensile testing machine of the usual materials. In particular, it is necessary to pay attention to the effective stroke of the electronic tensile machine and the sample fixture.
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