FUJIFILM LLLW Prescale (pressure measurement film) for extremely low pressure (0.20 - 0.6MPa)

Comprehensive FAQ: FUJIFILM Prescale LLLW Pressure Measurement Film (0.20 - 0.6 MPa):

1/ Introduction

FUJIFILM Prescale LLLW is a two-sheet pressure measurement film designed to visualize and quantify contact pressures in the 0.20 - 0.6 MPa range. When clamped between mating surfaces under load, the film produces a color density pattern proportional to the local pressure, enabling instantaneous, full-surface pressure mapping. It is widely used in automotive, electronics, printing, and medical device manufacturing to optimize fastening, sealing, and contact interfaces.

2/ Composition and Operating Principle

The Prescale system comprises two films:

- A-Film (Body Film) embedded with microcapsules containing color-forming agents.

- C-Film (Color Developer Film) coated with a reactive layer.

Under pressure, microcapsules in the A-Film rupture and release dye precursors, which react on the C-Film to yield a pink/red color. The color intensity correlates with local pressure magnitude; users interpret this via a standardized calibration curve (Curve C) provided by FUJIFILM to convert color density to MPa values.

3/ Key Features

- Immediate, full-area visualization of pressure distribution across contact interfaces.

- High resolution and sensitivity within 0.20 - 0.6 MPa for low-to-medium pressure applications.

- Customizable film shape and size by cutting the 270mm x 4m roll to fit diverse geometries.

- Compliance with RoHS 2 and RoHS 3 directives, ensuring absence of regulated hazardous substances.

- Single-use, disposable format eliminates film cross-contamination and simplifies data capture.

4/ Typical Applications

- Fastening torque and clamp force evaluation for bolts, nuts, and roll press mechanisms in automotive assembly.

- Contact pressure mapping of printing rollers, sealing bars, and laminating presses in packaging and paper industries.

- Uniformity assessment in plastic injection molds, metal stamping dies, and mechanical crimping fixtures.

- Sealing performance diagnostics for medical devices, footwear padding, and ergonomic grip interfaces.

5/ Instructions for Use

- Cut Prescale A-Film and C-Film layers to the required shape and size.

- Align A-Film and C-Film surfaces, ensuring no trapped air pockets.

- Position the sandwich assembly between the mating surfaces to be measured.

- Apply the operational load or clamping force and hold for the specified dwell time.

- Carefully separate the films and immediately compare the resulting color pattern to the supplied calibration chart to determine local pressure values.

For best results, maintain a consistent temperature (20 - 25°C) and humidity (< 60%) during measurement.

6/ Frequently Asked Questions (FAQ)

6.1/ Can LLLW film measure pressures outside 0.20 - 0.6 MPa? No. LLLW is calibrated exclusively for 0.20 - 0.6 MPa. Pressures below or above this range will produce faint or saturated coloration, respectively, leading to inaccurate readings.

6.2/ What is the typical accuracy of the pressure readings? When analyzed with a densitometer and standard lighting, LLLW provides +/-10 % accuracy or better, making it suitable for most engineering and quality-control tasks.

6.3/ How do environmental factors affect readings? Extreme temperature or humidity deviations can alter microcapsule behavior. For optimal performance, conduct measurements at room temperature (20 - 25°C) and moderate humidity (< 60%).

6.4/ Can the film be reused? No. Once the microcapsules have ruptured and produced color, the film cannot be reset. Each measurement requires a fresh set of A-Film and C-Film.

6.5/ How is the pressure value derived from the color intensity? FUJIFILM provides a standard color-density chart (Curve C). Users compare the film’s color density to this chart or use image-analysis software calibrated to the same curve for quantitative results.

6.6/ Is the film affected by oils or chemicals? Prescale films are intended for dry mechanical contact. Oil, grease, or aggressive chemicals can smear or dilute the color reaction, compromising accuracy.

6.7/ Where can I purchase genuine LLLW film and obtain technical support? Please contact QTE Technologies (qtetech.com/en)

7/ Storage and Handling

- Store films in the original packaging at 4 - 30°C away from direct sunlight and moisture.

- Avoid bending, creasing, or contamination; handle with clean, dry gloves.

- Use within the manufacturer’s shelf-life date to ensure consistent sensitivity.