Functional characteristics and equipment selection points of polyethylene film tensile testing machine

In the production and application of polyethylene (PE) film, mechanical properties such as tensile strength and elongation at break are key indicators for measuring product quality. Whether it is food packaging, agricultural covering film, or industrial heavy-duty packaging film, these parameters directly determine the durability and reliability of the film during use. The polyethylene film tensile testing machine is a precision testing equipment designed specifically for this demand.

Testing standards and core parameters

The tensile performance testing of polyethylene film is mainly based on domestic and foreign standards such as ASTM D882, GB/T 1040.3-2006, and ISO 527-3. These standards have clear regulations on sample preparation, fixture spacing (usually 50mm or 100mm), testing speed (such as 250mm/min or 500mm/min), etc. For example, LDPE film is often tested longitudinally and transversely using type 2 specimens with a width of 10mm, fixture spacing of 50mm, and a speed of 500mm/min.

The equipment itself usually has a precision of 0.5 or 1 level, with an effective force measurement range covering 0.4% to 100FS, a force resolution of up to 1/200000, and a displacement accuracy within ± 1%. For PE films with an elongation rate of over 800%, the equipment must have sufficient effective stretching stroke.

Key points for equipment selection

When choosing a testing machine, it is important to pay attention to the following aspects:

Fixture selection: For large-scale testing, pneumatic fixtures are the ideal choice as they can significantly improve efficiency and accurately control gauge length compared to manual fixtures.

Extension gauge matching: If the sample is dumbbell shaped, a non-contact video extension gauge should be used to measure deformation; The displacement method can be used for straight bar specimens.

Force range: The force value of polyethylene film is usually small, generally within 2kN. Choosing a small range sensor can ensure the accuracy of data under low load.

Features

The modern thin film tensile testing machine integrates multiple curve modes such as stress-strain and force displacement, and can automatically calculate key parameters such as tensile strength, elastic modulus, and yield strength. The equipment is driven by servo motors and precision ball screws, which have the characteristics of low vibration, low noise, and high stability, providing solid data support for the research and quality control of thin film materials.