The 4LW pressure measurement film is a micro-pressure type film, distinct from other models in both structure and packaging. Because it is designed for extremely low-pressure applications, the 4LW film features a larger core and box size. To prevent unwanted creasing or pressure marks when rolled, both edges are separated with isolation layers, resulting in a bulkier appearance when packaged.
Let’s take a look at the pressure range and film dimensions for the LLLLW model:
Pressure Measurement Range: 0.05 MPa – 0.2 MPa
Film Dimensions: 320 mm × 3 m
As you can see, the 4LW film covers a very narrow pressure range. From LW to 2LW, 3LW, and finally 4LW, the measurement ranges decrease progressively and seamlessly overlap, ensuring complete coverage from 0.05 MPa to 10 MPa. Users can easily choose the appropriate type according to their target pressure range.
Pressure Distribution and Measurement Method
- Measuring Pressure Distribution with Pressure Measurement Film
The film’s color density varies with pressure — darker red areas indicate higher pressure, while lighter red areas represent lower pressure. After color development, place the glossy PET surface (K film) facing upward on a white background and observe under bright lighting for best results. - Determining Pressure Values Using the Standard Pressure–Density Curve
When specific pressure values are required, compare the developed film color with the standard color sample and pressure–density curve.
By considering pressing conditions such as temperature, humidity, and the type of load (constant or instantaneous pressure), users can accurately determine the corresponding pressure value. For observation, place the colored PET side upward on white paper and examine it under adequate light.
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