Source: Link Testing Instruments Co.,Ltd.
Good sealing performance means that the package is intact as a whole, and the heat-sealed edge and the surface of the packaging bag have no defects that can exchange gas with the outside world, which can ensure that the product does not leak air or liquid during storage, transportation and sales. One of the effective ways for products to have quality problems such as oxidative deterioration, moldy, not crispy, and deliquescence. At present, the testing principles of packaging sealing performance include negative pressure method, vacuum attenuation method, ultrasonic scanning method, high-voltage discharge method, etc. The negative pressure method has a wide range of applications, and the types of packaging that can be tested are not affected by the packaging form, the type of packaged product, the packaging There are restrictions on size and other aspects, and it is possible to intuitively find the location of the leak in the test package and the pressure when the leak occurs.
Potato chips are a kind of puffed food with low moisture content and a certain amount of oil. They are sensitive to water vapor and oxygen. If the packaging is poorly sealed, potato chips will easily become soft during storage and sales. Therefore, potato chips The packaging bag should have good sealing performance. In this paper, the principle of negative pressure method is used to test the sealing performance of shrimp cracker packaging.
Test Standards and Instrument
The testing process is based on the standard GB/T 15171-1994 "Test Method for Sealing Performance of Flexible Packages", which is applicable to the test of sealing performance of sealed flexible packages made of various materials.
The testing instrument used in this test is the LTY-01 leak tester independently developed and produced by Link Testing Instruments Co.,Ltd.
Test principle: Using the principle of negative pressure method to test the sealing performance of the package is to place the package in the distilled water of the vacuum tank, and by vacuuming the inside of the vacuum tank, a certain pressure difference will be generated inside and outside the package. If the package is heat-sealed If the part or the mouth of the bottle is not tightly sealed, or if there are pinholes or other types of sealing defects on the surface of the package, the gas inside the package will leak from the weak seal, and continuous bubbles will emerge in the water. The pressure at which the package leakage occurs is leakage pressure. The larger the pressure value when the package leaks, the better sealing performance.
Test sample and test process
Test sample: In this test, a certain brand of potato chips was used as the test sample.
Experimental procedure:
(1) Pour a certain amount of distilled water into the vacuum tank, immerse the sample in the water in the vacuum tank, and cover the airtight cover.
(2) Set the parameter information such as vacuum degree and pressure holding time, turn on the vacuum pump, press the start button on the instrument panel, the test starts, and the vacuum tank is evacuated.
(3) Observe whether there are continuous air bubbles on the test surface during the process of evacuating or maintaining pressure. After the test, check to see if any liquid has penetrated the inside of the package.
Test Results and Analysis
When the negative pressure of the potato chip packaging sample tested in this test was -45.9 KPa in the vacuum tank, continuous air bubbles were generated at the junction of the upper edge and the back edge, and water infiltrated into the package, indicating that the sample was The junction of the upper edge and the back edge is poorly sealed.
The principle of negative pressure method can quickly and conveniently test the sealing performance of packaging. This paper uses the principle of negative pressure method equipment LTY-01 sealing tester to test the sealing performance of puffed food potato chip packaging, and verifies the sealing performance of the test samples on the upper side and the back side. The tightness of the junction is poor, the test process is simple, the equipment is easy to operate, and the test time is short. The test results can visually display the poor seal of the sample and the pressure when leakage occurs.
Test Results and Analysis
When the negative pressure of the potato chip packaging sample tested in this test was -45.9 KPa in the vacuum tank, continuous air bubbles were generated at the junction of the upper edge and the back edge, and water infiltrated into the package, indicating that the junction of the upper edge and the back edge is poorly sealed.
The principle of negative pressure method can quickly and conveniently test the sealing performance of packaging. This paper uses the principle of negative pressure method equipment LTY-01 sealing tester to test the sealing performance of puffed food potato chip packaging, and verifies the sealing performance of the test samples on the upper side and the back side. The tightness of the junction is poor, the test process is simple, the equipment is easy to operate, and the test time is short. The test results can visually display the poor seal of the sample and the pressure when leakage occurs.
For more details please visit www.linktesting.org
