Slide Angle Friction is a measurement of a sheet like substrate such as paper, corrugated, plastic film or paperboard which determines the angle of inclination at which one substrate affixed to a sled will begin to slide/slip against another substrate of a similar material.
During a test, an inclined plane is increased at a rate of 1.5 ± 0.5º per second by an 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 photo-optical sensor automatically stops the inclined plane and the operator can read the slide angle result.
A variety of factors can affect the Slide Angle measurements including abrasion, coatings, varnishes, printing and most importantly humidity.
FEATURES of TMI Coefficient of friction (slide angle friction)
• Motor-driven elevation
• Simple, low-cost measurement of static COF
• Photo sensor automatically stops the test after initial sled movement
•Measures only Slide Angle or Coefficient of Static Friction
Sliding blocks (at least 1 required to measure slide angle friction)
• T 503 sliding block for shipping sacks; 3.5 in. x 4 in., 1260 g. :
Catalog number 32-25-02
• T 815 sliding block for fiberboard; 2 in. x 4 in., 750 g.:
Catalog number 32-25-03
• D 202 sliding block for electrical insulation paper;
2.5 in. x 3 in., 235 g.: Catalog number 32-25-04
• T 548 sliding block for printed paper; 2.5 in. x 2.5 in., 200 g.:
Catalog number 32-25-05
• 1.5 in. x 3.5 in. sled for COF; 500 g.:
Catalog number 32-25-08
• Custom sliding blocks available upon request
Supported standards for TMI Coefficient of friction Model 32-25
TAPPI T 815, T 458 and ASTM D 202 with optional sliding blocks