Abstract: Pet foods packed in large-volume bags are likely to be broken when they are squeezed or impacted by external forces during transportation. This paper uses Labsink's self-developed LSSD-01 leakage and seal strength tester to test the bursting pressure of a brand of pet food aluminum-plastic composite film packaging bags, and introduces the testing principle of the equipment and the whole test process to improve the packaging material production process for the enterprise or The packaging process provides data support.
Keywords: pet food, aluminum-plastic composite film packaging, burst pressure, pressure resistance, leak and seal strength tester, broken bag
1, meaning
The blasting pressure test is the overall impact resistance and squeezing ability of the packaging bag. The blasting pressure of the packaging bag is monitored regularly and in time, which can effectively prevent the packaging bag from being impacted and dropped by external force due to insufficient toughness of the packaging material or poor sealing. Breakage during extrusion is of great significance in reducing the breakage rate of finished packaging in the circulation.
Pet food is a 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 usually packed in bags or cans. For non-vacuum-packed pet foods containing a certain amount of gas, the finished product packaging in the transportation, sales and other circulation links, the bags are squeezed, dropped or impacted by external forces, etc., will make the pet food inside the package Or the gas has a large impact on the bag body and the sealing mouth. If the flexibility of the packaging material is poor or the sealing is poor, the bag may be broken. Through the test of the burst pressure of the packaging bag, it can verify the weak part of the packaging and the overall stress level, which provides reference for the enterprise to control the quality of the packaging material, improve the heat sealing process, and adjust the packaging process.
Figure 1 Pet food aluminum-plastic composite film packaging
2, test samples
A brand of plastic packaging film bag for pet food packaging.
3, testing standards
At present, the method standard for the burst pressure test of soft plastic packaging has not been 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 Materials".
4, testing equipment
In this paper, Labthink LSSD-01 leakage and seal strength tester is used to test the burst pressure of pet food aluminum-plastic composite film packaging bag samples.
Figure 2 LSSD-01 leakage and seal strength tester
4.1 Test principle
The equipment is designed using the positive pressure test principle, that is, the gas pressure inside the sample is greater than the 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 is broken, the pressure value tested at this time is the burst pressure of the package, or the gas is filled into the sample to the inside of the sample. Specify the pressure and then place the sample in water or otherwise check the sample for leaks. In either case, under the impact of the gas inside the package, the weaker part of the package first breaks or leaks, so the position where the package is weak or weak can be inferred from the position where the package is broken or leaked. .
4.2 Scope of application
It is suitable for the determination of sealing strength, heat sealing quality, bursting pressure and sealing leakage performance of various heat sealing edges, such as soft packaging parts and aseptic packaging parts formed by various heat sealing and bonding processes.
Applicable to the compressive strength, burst strength and other indicators of the materials used in flexible packaging bags, the cap torque sealing index, the cap connection tripping strength, the stress strength of the material and the sealing, compression resistance and breakage of the entire bottle. Sexual indicators and other indicators for evaluation and analysis.
Meet many national and international standards, such as ASTM F1140, ISO 11607-1, ISO 11607-2, GB/T 10440, GB 18454, GB 19741, GB 17447, ASTM F2054, GB/T 17876, BB/T 0025, YBB00252005 Wait.
4.3 Equipment parameters
The test range of the equipment is 0 ~ 600 KPa. The special test can increase the test range to 0 ~ 1.6 MPa, which meets the test requirements of different samples.
The double test method of expansion inhibition and expansion non-inhibition can be freely selected by users according to different test purposes.
Various test modes, such as rupture test, creep test, creep to rupture test, etc., meet the test requirements that users do not need.
Support LystemTM laboratory data sharing system to manage test results and test reports.
5, the test steps
(1) Using the puncture head to form a circular hole on the surface of the packaging bag, use a double-sided tape to cover the sealing hole on the formed circular hole, so that the center position of the sealing pad coincides with the circular hole, and carefully care the probe of the device. Through the center of the gasket, the round 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 and adjust the flow valve to control the pressurization speed so that the gas slowly fills the inside of the sample, and the sample expands until it ruptures or leaks.
Figure 3 test process diagram
(3) Record the pressure value when the sample is broken or leaking, and record the location of the crack or leak.
6, test results
A total of 3 bags of samples were tested in this test. The burst pressures of the samples were 40.5 KPa, 41.8 KPa, and 40.7 KPa, respectively, and both broke at the side seal of the sample.
7. Conclusion
LSSD-01 Leakage and Sealing Strength Tester is a testing equipment for testing the burst pressure of soft plastic packaging. It can truly reflect the pressure resistance of the packaging bag, and can find the weak link of the whole package through testing, which provides the improvement of the subsequent process. in accordance with. The side seal of the sample tested in this paper has poor pressure resistance, and can be improved by the opposite side seal heat sealing process to increase the damage value of the package bag. Labthink has been committed to providing professional inspection services and testing equipment to customers around the world. Over the years, it has provided thousands of packaging burst pressure monitoring solutions to customers around the world, providing customers with reliable data support. The more you understand, the more trust! Jinan Languang Electromechanical Technology Co., Ltd. is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry!
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