Sealtick Leak Tester
Sealtick Leak Tester Non Destructive
Packaging Leak Testing Equipment & Solutions
Sealtick is the leading supplier and manufacturer of the high-quality non-destructive package leak testing systems for the dry food and pharmaceutical products manufacturers. We supply a wide range of packaging leak testing equipment; from the traditional underwater package leak testers to modern, semi-automatic non-destructive package leak testers based on Vacuum Decay Testing by Standard ASTM F2338-09 (2020).
Leak testing is crucial as the ingress of these contaminants can accelerate the decomposition of these products and ruin its content before the products made their way to the customers. These leak testers are effective in testing various types of packaged food, whether they are packed in alumunium foil, cans, sachets or flexible-type packaging.
The vacuum decay leak testing systems are ideal for a food manufacturer as they can be easily operated and can be fitted in production environment. This sophisticated leak detector is primarily used to test seal integrity on a packaging of a wide range of food products such as:
- Milk / Coffee powder, Nuts
- Snacks food; biscuits; wafer; chips
- Fresh salad pack,
- Cans with dried food; potato chips; candy,
- Herbs,
- Pet foods, and beverage containers.
The only test requirement is that the package should have dry contents and headspace to achieve accurate and reliable measurement.
Vacuum Decay Leak Testing Principle
The test begins with placing package in a closely fitting evacuation test chamber, which is equipped with an external vacuum source. The test chamber is placed under vacuum whose level is predetermined to simulate the real-time condition experienced by the packages during production and transportation process. A highly sensitive differential pressure sensor is used to monitor the decay in vacuum level. Once it reaches the desired vacuum level, the chamber is allowed to decay to the atmospheric pressure. The pressure decay curve is generated from this measurement, as shown in the figure below.
The pressure profile can be used to identify leakage. The time taken to create the vacuum can be used to identify large or coarse leak. Similarly, the rate of vacuum decay towards atmospheric pressure, depicted in stabilize and leak region above, is used to identify small or fine leak. This measurement can be further refined to concentrate on the most useful parts of the curve as shown in the next figure.
The peak vacuum V2 must be reached between T1 and T2. The maximum allowable time to reach vacuum level V2 is used to identify coarse leak. Package with large hole will provide extra air for evacuation which considerably slows the evacuation time. The settle time is important to ensure that a stable leak rate is achieved before fine leak measurement is conducted. Fine leak is identified when the maximum vacuum decay rate during the fine leak time T4 is larger than the allowable decay rate. This can be individual set and differ for different type of packaging. For example, small packs or very small satchets have much lower recommended fine leak rate limit in comparison to large packages such as salad bars.
Most tests can be performed rather quickly, with highly accurate results for a different variety of food packages including flexible packages, cans, large bags, heavy bags and many other products. Non-destructive packaging leak testing systems based on vacuum decay principle enable simple and semi-automated testing as test results can be finalized in 5-20 seconds. The test measurement creates a reliable and accurate quantitative result with a pass or fail display. Results can also be logged and downloaded for traceability.
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