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Testing program for flexibility of plastic shopping bags

Oct 25,2021

Source:Link Testing Instruments Co.,Ltd.

Plastic shopping bags are consumables in daily life. While they provide convenience to consumers, they also cause serious waste of energy resources and environmental pollution due to excessive use and inadequate recycling. In particular, ultra-thin plastic shopping bags are easily damaged, and most of them are discarded at will, becoming the main source of "white pollution". At present, more and more countries and regions have restricted the production, sale and use of plastic shopping bags. Therefore, in order to reduce the environmental pollution caused by plastic shopping bags, in addition to responding to the national "plastic restriction order" and reducing the use of plastic shopping bags as much as possible, the use of plastic bags can also be reduced by increasing the number of repeated uses of plastic bags. Therefore, plastic shopping bag manufacturers should strengthen the flexibility of plastic shopping bags, enhance their tensile strength, and extend the service life of plastic bags.

Test methods and test equipment

   The test standard that can be referred to for the tensile strength test of plastic films and sheets is GB/T 1040.3 "Determination of Plastic Tensile Properties Part 3: Test Conditions for Plastics and Sheets".

Auto Tensile Tester LTS-05

The detection can be carried out with the help of the LTS-05 intelligent electronic tensile testing machine independently developed and designed by Link Testing Instruments Co.,Ltd.

Test principle: The sample is clamped between the two chucks of the fixture, and the two chucks move relative to each other. The force value during the test is collected through the force sensor located on the movable chuck and the displacement sensor built into the machine. Change and displacement change, so as to calculate the tensile, tear, deformation rate and other performance indicators of the sample.

Test sample and test process

Test sample: This test uses a plastic shopping bag provided by a supermarket as the test object.

Experimental procedure:

(1) Use a sample cutter to cut 5 samples each with a width of 15 mm and a length of 200 mm along the horizontal and vertical directions of the plastic shopping bag sample.

(2 Clamp the two ends of the sample on the upper and lower chucks of the equipment respectively, and the long axis direction of the sample should coincide with the center line of the upper and lower clamps.

(3) Set the test speed, sample width and other parameter information.

(4) Click the test start option to start the test. The instrument automatically calculates and displays the final test results.

Test results and analysis

The transverse tensile breaking force of the plastic shopping bag sample tested this time is 51.135 N, the tensile strength is 62.676 MPa, and the elongation at break is 55.40%; the longitudinal tensile breaking force is 49.316 N, the tensile strength is 60.437 MPa, and the elongation at break. It is 67.30%.

  LTS-05 intelligent electronic tensile testing machine is a professional testing equipment for the tensile strength of plastic shopping bags. It has high test accuracy and good repeatability of test results, which can truly reflect the flexibility of plastic shopping bags. In addition to tensile strength, plastic shopping bags should also focus on their heat-sealing strength, dart impact and other performance indicators.

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