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TAPPI T 549 om-20
M00011840
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TAPPI T 549 om-20 Coefficients of Static and Kinetic Friction of Uncoated Writing and Printing Paper by Use of the Horizontal Plane Method
standard by Technical Association of the Pulp and Paper Industry, 2020
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This method describes a horizontal plane procedure for the determination of the coefficient of static andkinetic friction of paper measured when sliding against itself.The horizontal instrument requires some means of movement of the specimen in relation to the surfaceupon which it rests. The coefficient of friction (COF) is measured directly from the resistance to tangential motion and the applied weight pressing two pieces of paper together.
Static COF relates to the force required to initiate movement between two surfaces while kinetic COFrelates to the force required to cause continuation of the movement at uniform speed.
The determinations of COF for packaging materials is described in TAPPI T 815 "Coefficient of StaticFriction (Slide Angle) of Packaging and Packaging Materials (Including Shipping Sack Papers, Corrugated and Solid Fiberboard) (Inclined Plane Method)." In the method for testing packaging materials, the force measurement is often made on the third slip, while in this method the determination is made on the first slip.