Pressure measurement film is widely used for analyzing contact pressure distribution in industrial applications. To obtain reliable and repeatable results, correct handling and testing procedures must be followed carefully.
Step 1: Prepare the L-Sheet
Take the L-sheet from its protective black packaging. The coating layer is typically positioned inward. Cut the sheet into the required size and shape according to the test area.
During preparation, avoid applying any pressure, bending, or friction to the film, as the microcapsules inside the coating are highly sensitive and may react prematurely.
Step 2: Prepare the K-Sheet
Remove the K-sheet from the blue packaging, ensuring that the coated surface is facing outward. Cut it to match the dimensions of the L-sheet.
Maintaining consistent size and alignment between the two sheets is important to ensure accurate pressure distribution recording.
Step 3: Assemble the Pressure Film
Carefully place the L-sheet and K-sheet together, with their coated surfaces facing each other. Avoid sliding or pressing the sheets during assembly, as this may cause unintended color development.
Proper alignment ensures that the pressure-sensitive reaction occurs only under actual test conditions.
Step 4: Insert the Film into the Test Area
Position the assembled pressure measurement film between the two contact surfaces where pressure needs to be evaluated.
Make sure the film is placed flat and fully covers the contact area. Misalignment or wrinkles may lead to uneven or misleading pressure distribution results.
Step 5: Apply Pressure and Complete the Test
Apply pressure according to the test requirement. The pressure can be applied either gradually or within a short duration, depending on the actual application scenario.
After the pressure cycle is completed, carefully remove the film without disturbing the developed surface.
Step 6: Analyze the Developed K-Sheet
Place the developed K-sheet on a clean white background, with the smooth PET side facing upward.
Observe the film under uniform lighting conditions. The color density and distribution pattern provide a direct visual indication of pressure magnitude and contact uniformity.
- Darker areas indicate higher pressure
- Lighter areas indicate lower pressure
- Uneven patterns suggest inconsistent load distribution
For quantitative analysis, the color density can be compared with a standard pressure–density calibration curve to estimate the actual pressure values.
Standard Pressurization Methods
Depending on the testing objective, different pressurization approaches may be used:
Sustained Pressure Condition
Gradually increase the applied load and reach the target pressure within approximately 2 minutes. Maintain the pressure for an additional 2 minutes to allow stable color development.
Instantaneous Pressure Condition
Increase the pressure more rapidly, reaching the target level within about 5 seconds. Maintain the pressure for 5 seconds before releasing.
Selecting the appropriate pressurization method is important, as it directly affects the color response and interpretation of the pressure measurement film.
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