SF Series
Kyowa's SF series measures static friction on flat solid surfaces automatically. The touch of a button starts the measurement and displays the resulting Coefficient of Static Friction in a few seconds. Neither complicated adjustment nor data correction is required.
Models
Mobile Friction Meter, SF-1:
This compact device fits in one hand and is useful for measuring objects in place. (e.g. floor, wall, part of body, etc)
- Fits in one hand.
- Uses a special coil spring pressure technique to measure friction on horizontal, beveled or vertical surface like floors, walls, parts of the body, etc.
- One-touch automated operation.
- Measurement result is displayed on a digital display in a few seconds.
- Powered by ordinary AA batteries.
Portable Friction Meter, SF-2:
The SF-2 uses a conventional stage tilt method for measurement, enhanced by automated operation. Compact size foot print about 230 x 170mm.
- Compact portable type foot print about 230 x 170mm.
- Conventional stage tilt method is used, but performs automated operation with the precise sensor to detect sliding object.
- Respective material can be set up on the upper and the lower to measure friction between two materials. (e.g. rubber and metal, film and polymer plate, etc.)
- Measured result is displayed on the digital display in a few seconds.
Measurement principle
SF-1
A special method that we call “coil spring pressure technique” described below is adopted in this principle. The contact is equipped on the pressure shaft with a flexible joint, and the vertical load is applied to the measuring surface through the coil spring. By tilting the coil spring little by little so that an inclined load is applied to the measuring surface, the contact will slide.
This instrument detects the angle (θ) just as the contact starts sliding, and converts it into a coefficient of static friction.
SF-2
Sample (A) is attached to the tilt stage and (B) is attached to the contact. (fixing sheet by binding and solid by a double-sided adhesive tape.
To use the instrument, first set the contact on the tilt stage so that the sensor pole passes the sensor section. The instrument will tilt the stage and detect the angle just as the contact starts sliding, and convert it into a coefficient of static friction
Applications
- Effects of surface treatment: polished or waxed car bodies, coated, painted or printed surfaces
- Evaluation of stick slip phenomenon: wiper blades on car windshields, natural cloth on polymer sheets.
- Slippage or non-slippage: floors, materials of sole, tires, etc., paints on ship bottom, hair
- Sense of touch by hand: interiors, walls, or materials of any body
- Friction control: paper movementin photocopiers or printers, coating on carton boxes, any materials or parts in automated devices, sheet belts and cloth
