Emerson’s COF tester measures slide angle friction

Emerson Apparatus, Gorham, ME, says its Coefficient of Friction (COF) tester measures the slide angle friction of a sample sheet substrate such as paper, corrugated, paperboard or plastic film which determines the angle of inclination at which one sample affixed to a sled will begin to slide/slip against another substrate of a similar material.

Slip and friction testing helps in the evaluation of chemicals and additives used to create and minimize the degree of friction between two contacting test specimens.

During a test, an inclined plane is increased at a rate of 1.5 +/- 0.05 deg/sec by a vibration-isolated electric motor until the test block begins to slide. The initial movement of the sled is the slide angle or coefficient of static friction of the material. When the test block just begins to slide, a sensor automatically stops increasing the inclined plane and returns it to the start position at high speed. The test results remain on the screen until the next test is run.

Each unit includes a calibration certificate. Amongst the tester’s features are:

• Digital display with 0.1-deg resolution
• Motor-driven elevation
• Simple, one-button measurement of static COF
• Precision resolver automatically captures the angle of the sled movement
• Measures only slide angle or COF
• Determines static and dynamic COF of sheet materials.

As well, the tester has:

• Direct drive arm with unique skid control
• Easily interchangeable sleds and easy, reliable operation
• Rapid platen-return to speed testing
• Isolated drive mechanism with slip clutch for smooth operation and accurate slip angle detection
• Rugged design for long-life operation
• Easy Serial over USB data logging port option available
• Meets TAPPI 815, 503, 548 and ASTM D 202.
• Custom sliding blocks are available on request.

Emerson Apparatus, www.emersonapparatus.com

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