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Testing method for toughness of POF shrink film

Dec 17,2023

Source: Link Testing Instruments Co.,Ltd.

Tensile strength and elongation at break refer to the maximum force that a packaging material can bear before breaking and the elongation at break. By detecting this indicator, we can effectively solve problems such as loose and damaged packaging caused by poor toughness of POF shrink film. 

Shrink film is a commonly used outer packaging material. It is generally used for outer packaging and cluster packaging in industries such as food, cosmetics, pharmaceuticals, and daily necessities. It generally has high transparency, high shrinkage, high toughness, high heat sealing performance, antistatic, Excellent properties such as cold resistance. However, if the toughness of the POF shrink film is poor, it will easily cause the bound products to loosen or fall off, and it will also be prone to breakage or poor elasticity during use. Therefore, enterprises should strengthen the monitoring of toughness-related indicators of POF shrink film to ensure its excellent toughness.


Test methods and test instrument

This test was conducted with reference to the method requirements in the test standard GB/T 1040.3-2006 "Determination of Tensile Properties of Plastics Part 3: Test Conditions for Thin Plastics and Sheets" regarding the toughness of flexible plastic packaging. The instrument uses the LTS-05 intelligent electronic tensile testing machine independently developed and produced by Link Testing to test the tensile strength and elongation at break of the sample.

Testing principle: The sample is clamped between the two clamps, and the two clamps move relative to each other. The force value during the test is collected through the force sensor located on the movable clamp and the displacement sensor built into the machine. Changes and displacement changes, thereby calculating the tensile, tear, deformation rate and other performance indicators of the sample.


Test samples and test process



Test sample: POF shrink film sample provided by a company.


Experimental procedure:

(1) Use a sampler to cut 5 long strips of 15 mm wide and 200 mm long specimens from the sample in both the transverse and longitudinal directions.

(2) Clamp both ends of the sample to the upper and lower chucks of the equipment respectively. The long axis direction of the sample should coincide with the center line connecting the upper and lower clamps.

(3) Set parameter information such as test speed, specimen width, etc.

(4) Click the test start option to start the test.

(5) The instrument automatically calculates and displays the final test results.


Test results and analysis

The longitudinal tensile strength of the sample tested was 27.793 N, the tensile strength was 142.518 MPa, and the elongation at break was 82.9%; the transverse tensile strength was 32.412 N, the tensile strength was 148.594 MPa, and the elongation at break was 87.7%. .

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