Friction Tester (Coefficient of Static & Kinetic Friction) This is an equipment to check the Coefficient of Static Friction (COF) as well as the Coefficient of Static Friction (COF) between Paper - Paper, Film - Film, Laminates - Film / Metal, etc Definitions : The coefficient of friction is the ratio of the frictional force resisting movement of the surface being tested to the force applied normal to that surface (the weight of the material above that surface). The static coefficient is the ratio of the force resisting initial motion of the surface to the normal force. The kinetic coefficient (not determined by this method) is the ratio of the force resisting motion of the surface to the normal force once the motion is in progress. Significance : The coefficient of friction of packaging materials indicates how packages made from that material will perform in many critical applications. The COF values are directly related to the optimum working of films or laminates on F.F.S machines used in packaging of products in pouches. While excessive friction will lower down production speeds, the lower friction may cause slippage and improper pouch formations. The coefficient of friction of printing and writing papers is an indicator of the ease with which the top or bottom sheets of a stack of paper will slide across the succeeding sheet, such as occurs on the infeed of a printing press or the sheet transport into a copier machine. A minimum value of coefficient of friction is required to prevent doublefeeding of any sheets. A high coefficient of one surface of paper or paperboard (containerboard) to itself means that containers having that surface will tend to resist sliding in unit loads. A low coefficient may indicate potential problems with the packages slipping from the load. The equipment confirms to various International standards like TAPPI T - 549. Models available : Various models starting from Standard Digital models to the high-end Fully Automatic Computerized models. This equipment is relevant to : Paper Mills Printing / Processing Houses Plastic Film Manufacturers. Laminators Heavy End-Users of above. Research Institutions. Packaging Development centers.