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How to test the tightness of the packaging bag?

February 18, 2022

info@haoxiang2005.com

How to test the tightness of the packaging bag?

In the packaging bag production process due to the influence of many factors, may produce sealing leakage seal, pressure through or material itself cracks, micropores and the formation of internal and external connected holes. These will have a very adverse impact on the packaging content, especially in food, pharmaceutical packaging, daily chemicals and other industries, sealing will directly affect the quality of the product. Poor sealing is the main reason for future leakage and corruption.

packaging bags.

See the criteria as below:

Standard CalledTesting nameSample TypeTest MethodCondition
ASTMD 3078-1994Standard Test Method for Detecting

Leaks in Flexible Packaging

Flexible Packaging BagVisual inspection in
air bubble and coloring
Under 17kPa, 24kPa, 51kPa, 90kPa
vacuum level to keep for 30s.
JIS Z0382-1981Test method of
sealing flexible packaging
Flexible Packaging BagVisual inspection in
air bubble and coloring
Under 0.98kPa vacuum level to
keep 30~60s.
GB/T 15171-1994Test method of sealing
function in flexible packaging
Flexible Packaging BagVisual inspection in
air bubble and coloring
Under 20kPa, 30kPa, 50kPa, 91kPa
vacuum level to keep 30s.

There have a lot of difference testing way to explain and meet the standard. The general approve in testing is GB/T15171–1994.

packaging bags. (3)
packaging bags. (2)

Three detail test method:

  • Coloring liquid impregnation method
  • Decompression method in water
  • Vacuum generator method

Please look forward to the next article for a detailed analysis if you interested.

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