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Fuji Paper Test

The term Fuji Paper Test refers to any pressure measurement experiment made with either Fujifilm Prescale® or Pressurex-micro®. These products contain a layer of microspheres that rupture when pressure is applied. After rupture, a developer changes the color to a shade of pink for Fujifilm Prescale® or a grayscale color for Pressurex-micro®. The intensity of the color change is proportional to the amount of pressure.

Researchers at Yonsei University College of Medicine in Seoul, Korea performed Fuji Paper Tests using Fujifilm Prescale® low pressure film, code LW, which operates between 2.5 and 10.0 MPa. The published research is Femoral Graft-Tunnel Angles in Posterior Cruciate Ligament Reconstruction: Analysis with 3-Dimensional Models and Cadaveric Experiments. Sung-Jae Kim, Yong-Min Chun, Sung-Hwan Kim, Hong-Kyo Moon, and Jae-Won Jang, Yonsei Med J 54(4):1006-1014, 2013. To perform this work, Sung-Jae Kim, et al, studied posterior cruciate ligament reconstruction of knee joints. Figure 1 shows the Fuji paper test site, and Figure 2 show representative test results.

Fuji Paper Tests

Fig 1: The Fixture for the Fuji Paper Tests Showing the Location of the Fujifilm Prescale®

Results

Fig 2: Fuji Paper Test Results for Four Different Graft Techniques. The as-tested Fujifilm Prescale® results are on the left, and the Topaq® analyzed results are on the right.

The left side of Figure 2 shows the Fujifilm Prescale® sheets immediately after the tests. Topaq® analyses of the raw results are shown on the right side of Figure 2. Topaq® scans the raw results using a calibrated densitimetric scanner and then converts them into a colored display.

A second example of a Fuji Paper Test was performed by Yun-Biao Xin of Wafer Technology, MEMC Electronic Materials, Inc, St Peters, MO. This work was titled, Modeling of Pad-Wafer Contact Pressure Distribution in Chemical-Mechanical Polishing. These Fuji Paper Tests were performed with Pressurex-micro®, which operates below 20 psi (1.5 kg/cm). Figures 3 and 4 show the results of this work. Figure 3 shows a dark region at the circumference of the soft rubber pad. This dark ring indicates a high pressure area. Figure 4 shows no ring for the harder Rodel H-2 pad.

Soft Rubber Pad

Fig 3: Fuji Paper Test of a Soft Rubber Pad

Rodel H-2 Pad

Fig 4: Fuji Paper Test of a Rodel H-2 Pad

Additional information on Fuji Paper Tests can be found in product links to Pressurex-micro® and Fujifilm Prescale®. More information can be found in the Glossary under the following topics: Fuji Paper, Fuji Pressure Film, Prescale®, Prescale® Fuji Film, Pressure Film, Pressure Indicating Film, Pressure Measurement Film, Pressure Paper, and Pressure Tape.