Proper handling of pressure measurement film is critical to ensure reliable and consistent test results. Incorrect operation during pressing or testing stages can easily lead to inaccurate color development and misinterpretation of pressure distribution.
Pressing Stage Precautions
The L sheet is highly sensitive to even minimal pressure before actual testing. Any unintended pressing, folding, or friction may trigger premature color reaction inside the microcapsules. Therefore, the film should always be handled carefully and kept flat prior to use.
Since the color-forming material may transfer onto the skin, direct contact should be minimized. Wearing protective gloves is recommended, especially during frequent handling, to avoid potential irritation for sensitive users.
Environmental conditions play an important role in measurement stability. For best performance, the recommended operating range is:
- Temperature: 20°C to 35°C
- Humidity: 35% to 80% RH
Operating outside this range may result in variations in color density and reduce measurement reliability.
The final color development on the K sheet is influenced not only by pressure but also by environmental factors and pressing duration. Consistent test conditions are therefore essential for repeatable results.
To ensure proper color formation, both L and K sheets must remain clean. Any contamination such as water, oil, or dust on the film surface or test object may interfere with the chemical reaction and lead to uneven or incomplete color development.
Special Environmental Considerations
In specific application environments, additional precautions are required:
- High-temperature pressing:
When the process involves prolonged heat exposure, it is recommended to use thermal insulation materials outside the film. This helps prevent excessive heat from affecting the film’s performance and measurement accuracy. - Water or oil environments:
When testing in wet or oily conditions, the film should be sealed inside a protective waterproof and oil-resistant layer. Direct exposure to liquids can disrupt the color-forming process.
Pressure measurement film is designed for single-use only and should not be reused after testing. In addition, always verify that the film is used within its specified shelf life to ensure proper functionality.
Testing Stage Guidelines
After pressure application, the color density does not stabilize immediately. It typically increases gradually within a short period and may slowly decline over time.
For more accurate evaluation, it is recommended to measure or analyze the color density within 30 to 60 minutes after pressing. This time window provides a more stable and representative indication of the actual pressure distribution.
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