This standard specifies the test method for the sealing performance of flexible packaging. This standard is applicable to the test of sealed flexible packaging made of various materials. GB/T 15171-1994 Test method for sealing performance of flexible packaging GB/T15171-1994 Standard download decompression password: www.bzxz.net
This standard specifies the test method for the sealing performance of flexible packaging. This standard is applicable to the test of sealed flexible packaging made of various materials.

National Standard of the People's Republic of China
Test method for leaks in sealed flexible packages
Test method for leaks in sealed flexible packages1 Subject content and scope of application
This standard specifies the test method for the sealing performance of flexible packages. This standard is applicable to the test of sealed flexible packages made of various materials. 2 Test purpose
This standard can be used as a test for one of the following purposes: a. To compare and evaluate the sealing process and sealing performance of flexible packages; b. To provide relevant basis for determining the technical requirements for the sealing performance of flexible packages: to test the sealing performance of flexible packages after drop, pressure resistance and other tests. c
3 Terminology
GB/T 15171--94
3.1 Flexible Package
For flexible packages that need to have sealing properties, the packaging materials used shall not have various defects that affect the sealing properties, such as pinholes, cracks, and unsealed or opened seals.
3.2 Sealing Performance
The property of a flexible package to prevent other substances from entering or the contents from escaping. 4 Test Principle
4.1 Method 1
This method is used for packages whose outer layer material performance will not be significantly reduced during the test under the action of water, such as packages with plastic film as the outer layer.
By evacuating the vacuum chamber, a pressure difference between the inside and outside of the sample immersed in water is generated, and the gas escapes from the sample or the water penetrates into the sample is observed to determine the sealing performance of the sample.
4.2 Method 2
This method is used for packages whose outer layer material performance will be significantly reduced during the test under the action of water, such as packages with paper outer layer materials.
Method 2 is divided into two methods, A and B. Method A is used for arbitration inspection. 4.2.1 Method A
Fill the test liquid into the sample, place the sample on filter paper after sealing, and observe the leakage of the test liquid from the inside to the outside of the sample. 4.2.2 Method B
By evacuating the vacuum chamber, a pressure difference between the inside and outside of the sample is generated, and the expansion of the sample and the recovery of the sample shape after the vacuum is released are observed to determine the sealing performance of the sample.
Approved by the State Administration of Technical Supervision on August 16, 1994, and implemented on March 1, 1995
5 Test equipment
The test equipment shall include the following parts:
GB/T 15171—94
5.1 Vacuum chamber: It consists of a vacuum container made of transparent material that can withstand a pressure of 100kPa and a sealing cover. The vacuum container is used to hold the test liquid and the test sample; the sealing cover is used to seal the vacuum chamber. When evacuating, the sealing cover shall ensure the airtightness of the vacuum chamber.
During the test, the maximum vacuum degree that can be achieved in the vacuum chamber shall not be less than 95kPa, and the vacuum degree can be reached from the normal atmospheric pressure within 30~60s.
5.2 Sample fixture: It is used to fix the sample in the test liquid in the vacuum chamber. Its material and shape shall not affect the sample performance and test observation.
5.3 Pipeline: including vacuum tube connected to vacuum source and exhaust pipe connected to atmosphere. Both should be equipped with valves. 5.4 Vacuum gauge: used to measure vacuum degree in vacuum chamber, its accuracy shall not be lower than 1.5 level. 5.5 Control device: including vacuum switch, vacuum degree adjustment device, air inlet valve, etc. 6 Test sample
6.1 The sample shall be a representative soft package containing actual contents or its simulant. 6.2 The number of samples for the same batch (drink) test can be determined according to the value, size, characteristics and test purpose of the sample. Generally, it shall not be less than 3 pieces. 7 Test conditionsbzxZ.net
The tests specified in this standard shall be carried out in a laboratory under normal environmental conditions. 8 Test steps
8.1 Method
8.1.1 Put an appropriate amount of distilled water in the vacuum chamber, fix the sample on the sample fixture, and then immerse it in water. At this time, the distance between the top of the sample and the water surface shall not be less than 25mm.
Note: As long as it is ensured that leakage in various parts of the sample can be observed during the test, two or more samples can be tested at one time. 8.1.2 Cover the sealing cover of the vacuum chamber, close the exhaust pipe valve, and then open the vacuum pipe valve to evacuate the vacuum chamber. Adjust the vacuum degree to one of the following values ​​in 30 to 60 seconds: 20, 30.50.90 kPa, etc. When a certain vacuum degree is reached, stop evacuating and maintain the vacuum degree for 30 seconds. The adjusted vacuum value is determined according to the characteristics of the sample (such as the packaging material used, sealing conditions, etc.) or the provisions of relevant product standards. However, the sample shall not rupture or crack at the seal due to excessive internal and external pressure difference. 8.1.3 Observe the leakage of the sample during evacuation and vacuum maintenance to see if there are continuous bubbles. A single isolated bubble is not considered as a sample leakage.
8.1.4 Open the air inlet valve to allow the vacuum chamber to communicate with the atmosphere, open the sealing cover, take out the sample, wipe off the water on its surface, and open the seal to check whether the test water has penetrated into the sample.
8.2 Method 2
8.2.1 Method A
8.2.1.1 Take out the contents of the sample and wipe the inside of the sample. 8.2.1.2 Pour the test liquid (a colored aqueous solution with a clear color difference from the filter paper) into the sample and seal the mouth. 8.2.1.3 Place the sample on the filter paper for more than 5 minutes and observe the leakage of the test liquid from the sample to the outside. Then turn the sample over and test the other side.
8.2.2 Method B
8.2.2.1 Place the sample in the vacuum chamber, cover the vacuum chamber sealing cover, and close the air inlet valve. 8.2.2.2 Open the vacuum tube valve to evacuate the vacuum chamber, and adjust the vacuum degree to one of the following values ​​within 30 to 60 seconds: 20, 30, 50, 350
GB/T 15171-94
90kPa, etc. When a certain vacuum degree is reached, stop evacuating the chamber, and keep the vacuum degree for one of the following time: 3, 5, 8, 10min, etc. The adjusted vacuum value and vacuum holding time are determined according to the characteristics of the sample (such as the packaging material used, sealing conditions, etc.) or the relevant product standards. However, the sample shall not be broken or the seal shall not be cracked due to excessive internal and external pressure difference. 8.2.2.3 Open the air inlet valve, quickly restore the air pressure in the vacuum chamber to the pressure, and observe whether the shape of the sample has returned to its original shape. 9 Evaluation of test results
9.1 Method -
If no continuous bubbles are generated during the vacuuming and vacuum holding period and no water seeps into the sample during the unsealing inspection, the sample is qualified, otherwise it is unqualified.
9.2 Method II
9.2.1 Method A
If no test liquid leaks out, the sample is qualified, otherwise it is unqualified. 9.2.2 Method B
When the pressure in the vacuum chamber is quickly restored, if the sample can return to its original shape, the sample is qualified, otherwise it is unqualified. 10 Test report
The test report shall include the following contents:
Materials and sealing methods used for packaging;
Test methods adopted;
Any other tests that the sample has been subjected to before testing according to this standard and the description of the results; Test equipment;
Number of samples;
The value of the vacuum degree maintained in the vacuum chamber and the holding time; Records of various phenomena observed on the sample during the test; Test evaluation results;
Other necessary descriptions.
Additional description:
This standard is proposed and managed by China National Packaging Corporation. This standard is drafted by the National Packaging Product Quality Supervision and Inspection Center (Jinan), Qingdao Plastic Factory No. 8, and Jinan Composite Packaging Printing Factory. The main drafters of this standard are Zhou Jiayan, Wang Xingdong, Liu Yongxin, Wu Bangzhe, and Zhang Chengzhi. This standard adopts the American Society for Testing and Materials standard ASTMD3078 "Test Method for Sealing Performance of Flexible Packages". 351
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