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.

Generally, heat shrinkable films and stretched films require higher tensile properties of the material.

 2.Tensile test of electronic tensile testing machine

In the tensile test, the two ends of the material sample are generally clamped on two clamps at a certain distance. The two clamps separate and stretch the specimen at a certain speed, and measure the stress change on the specimen until the specimen 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 its related materials, for example, the elongation of polymer materials is far superior to materials such as metals, fibers, wood, and plates. Therefore, the tensile testing machine for detecting high molecular polymers is different from the tensile testing machine for tensile testing of ordinary materials.,in particular, it is necessary to pay attention to the effective stroke of the electronic tensile testing machine and the sample fixture.