Source: Link Testing Instruments Co.,Ltd.
The burst pressure test is the impact resistance and extrusion capacity of the packaging bag as a whole. Regular and timely monitoring of the burst pressure of the packaging bag can effectively prevent the packaging bag from being impacted by external force, falling, Breakage during extrusion is of great significance to reduce the breakage rate of finished product packaging in circulation.
Pet food is food specially provided for pets and small animals. It is a high-grade animal food between human food and traditional livestock and poultry feed. It is generally packaged in bags or tin cans. For non-vacuum-packed pet food that contains a certain amount of gas, the finished product packaging is in the circulation links such as transportation and sales, and the packaging bags are squeezed, dropped or impacted by external forces, etc., which will make the pet food inside the package Or the gas has a greater impact on the packaging bag body and the seal. If the flexibility of the packaging material is poor or the seal is not well sealed, the bag is prone to breakage. By testing the burst pressure of packaging bags, the weak parts of the packaging and the overall stress level can be verified, providing reference for enterprises to control the quality of packaging materials, improve heat-sealing processes, and adjust packaging processes.
Test Method and Instrument
At present, there is no method standard for the burst pressure test of flexible plastic packaging released in China. The test process mainly refers to the American standard ASTM F1140/F1140M-2013 "Test method for resistance to internal pressure damage of unconstrained packaging".
In this test, the LTMFY-06S leak and seal strength tester developed and produced by Link Testing was used to test the burst pressure of the pet food aluminum-plastic composite film packaging bag samples.
Test principle: The equipment is designed using the positive pressure test principle, that is, the gas pressure inside the sample is greater than that outside. By filling a certain amount of gas into the sample package, and monitoring the pressure change in the package in real time, until the package breaks, the pressure value tested at this time is the burst pressure of the package, or filling the sample with gas to specified pressure, and then put the sample in water or use other methods to see if the sample leaks. In any case, under the impact of the gas inside the package, the weaker part of the package will first rupture or leak. Therefore, the position of the package where the bag breaks or leaks can be used to infer the weaker part of the package. .
Test sample and test process
Test sample: aluminum-plastic composite film bag for pet food packaging of a certain brand.
Experimental procedure:
(1) Use a puncture head to form a circular hole on the surface of the packaging bag, use double-sided tape to cover the sealing gasket on the formed circular hole, make the center of the sealing gasket coincide with the circular hole, and place the probe of the device carefully Through the central position of the gasket, the circular hole is inserted into the inside of the sample to ensure a good seal near the insertion point and no air leakage.
(2) Start the test, adjust the flow valve to control the pressurization speed, so that the gas is slowly filled into the sample, and the sample expands until it bursts or leaks.
(3) Record the pressure value when the sample ruptures or leaks, and record the location of the rupture or leak.
Test Results and Analysis
A total of 3 bags of samples were tested in this experiment. The burst pressure of each sample was 40.5 KPa, 41.8 KPa, and 40.7 KPa, respectively, and all of them ruptured at the side sealing edge of the sample.
For more details please visit www.linktesting.org
