3 points to pay attention to when purchasing material testing machines

Jinan Hengsi Shanda Instrument Co., Ltd. specializes in the production of various typesMaterial testing machine, When purchasing a material testing machine, users should consider the quality, performance and price of the instrument in many aspects. The following three things that customers who purchase material testing machines should not ignore.

When used as a material, 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 test (stress-strain test) generally involves clamping the two ends of the material sample on two fixtures at a certain distance, and the two fixtures separate and tensile the sample at a certain speed to measure the stress changes on the sample until the sample is damaged.

Tensile test is one of the widely used methods to study the mechanical strength of materials, and a tensile test machine with constant speed movement is required. According to the different load measurement methods,Tension testerIt can be roughly divided into two categories: pendulum tensile testing machine and electronic tensile testing machine. Currently, the most commonly used electronic tensile testing machine is used.

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.

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