When we do product testing in the factory, we often come across such an annoyance:Obviously it is the same product, tested in the same way, but the results are always different. This not only gives the production department a headache, but also makes it difficult for quality inspectors to accurately determine whether the product is qualified.
Today, we're going to talk about the reasons behind this problem and find out what to do about it.
I. Theoretical foundations
To figure this out, we have to understand a basic principle. In physics, there is a formula called the 'ideal gas equation of state':
PV = nRT
To put it bluntly:
- P is pressure.
- V is the volume (test volume)
- n is the amount of gas
- R is the ideal gas constant (8.314 J/(mol-K))
- T is the temperature
This formula tells us that temperature changes directly affect test results. This is exactly whatJCGK is the first in the industry to create a temperature compensation algorithm on the test side.The
Through this innovative technology, JCGK's airtightness testing equipment is able to automatically compensate for temperature variations, ensuring the accuracy and consistency of test results. This is a unique advantage that other brands of airtightness testing equipment do not have.
II. Main causes of inconsistent test results
1. Problems with the product itself
As some people say, 'the devil is in the details'. The product may have these glitches:
- Small defects in the welds (commonly known as cracks)
- Tiny air holes on the surface (commonly known as trachoma)
Sometimes the dust in the air runs into the small hole blocked, this time the test passes, after a while the dust falls off, and then test the air leakage, which leads to fluctuations in the test results
2. Product material characteristics
Some products are not inherently easy to measure:
- For example, flexible food packaging, infusion bags and other soft and flimsy things
- Each time they are inflated, they bulge out in a different shape
- The shape is different and the measured air leakage is naturally different
Food packaging box air tightness test case
3. Environmental factors
When testing, the surroundings can also 'add to the chaos':
- direct air conditioning
- The fan is whirring.
- These can lead to:
- Test air tube jitter
- Localized temperature differences. Hot here, cold there.
- Pressure fluctuations, high and low pressure
4. Test equipment can also be problematic
- Problems with the accuracy of the airtightness tester itself, leading to air leakage
- Problems with the test system, whether or not it has temperature compensation can affect the test results
Airtightness test equipment is also a machine, and inevitably there will be small problems of one kind or another.
III. How can these problems be solved?
1. What about product issues
- Optimization of product design and production processes
- Welding should be strictly controlled, strengthen the welding quality control
- Improve the material surface treatment process, the surface treatment should be good
2. What to do if soft products are not well tested
- Make a special jig to hold it in place.
- Every time we inflate, we do it at a uniform rate.
- Ensure that the product form is consistent from one test to the next
3. What to do about the environment
- There's no wind blowing in the test area.
- The temperature should be kept stable and the environment should be maintained at a constant temperature
- Isolation from external interference by means of a protective cover
4. Equipment should be well maintained
- Have your equipment calibrated by a professional on a regular basis
- Always check the lines for problems.
- Ensure stable operation of the entire test system
IV. Practical application cases
In a well-known automotive parts manufacturer, the original use of ordinary airtightness test equipment often encountered unstable test results.After replacing and upgrading to JCGK's dual-channel airtightness testing equipment, due to its unique temperature compensation function, the repeatability of the test results has been significantly improved, and the judgment of product qualification rate has been more accurate, which has greatly improved the production efficiency.
Dual-channel airtightness testing equipment for automotive parts
V. Summary
Unstable airtightness test results are a complex problem that needs to be addressed from multiple angles. It is particularly important to choose the right equipment that JCGK provides a reliable solution to this problem with its unique temperature compensation function and stable system performance. By choosing the right equipment with reasonable operation specification and environment control, we can get stable and reliable test results.
To learn more detailed airtightness testing program and application cases, please pay attention to [Jingcheng Engineering Airtightness].
