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    Understanding CoF in Packaging | Catty Corporation
    The static sliding friction factor (Coefficient of Friction, COF) in packaging, measured by standards like ASTM D1894, defines the force needed to start movement between stacked cartons or films (e.g., plastic on plastic). Values typically range from 0 to 1, with lower COF allowing easier sliding (less "sticking") for automation, while higher COF provides stability for stacking. It's crucial for high-speed lines to prevent jams (too high COF) or loss of grip (too low COF). 
    Typical Values & Examples 
    • General Polymers: Often between 0.2 and 0.6.
    • HDPE: Around 0.2.
    • UHMW (Ultra-High Molecular Weight Polyethylene): Lower, around 0.14.
    • Paper/Fibreboard: Generally higher friction than plastic. 
    Why It Matters in Packaging 
    • Machine Operation: Prevents film from sticking to rollers (too high) or slipping off grippers (too low).
    • Stacking Stability: Higher COF prevents stacked boxes/bags from sliding apart.
    • Product Handling: Controls how easily products slide on conveyor belts or settle into cartons. 
    Measurement 
    • Tested using instruments that drag a sled (surface) across a film/material.
    • Static COF is the initial force peak to initiate motion (stick-slip).
    • Kinetic COF is the average force once moving. 
    Industry Goal 
    • To find the optimal COF for specific packaging materials (films, papers, cartons) that balances the need for controlled movement with stable stacking, often by adding anti-blocking agents to films. 
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      Dec 11, 2005 — Most polymers have coefficients of friction in the range 0.2 to 0.6 but the fluorocarbons generally have lower coeffic...
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    • What is coefficient of friction (COF), and why is it important in ...
      Jun 1, 2020 — μ = f÷N. Where μ is the coefficient of friction, f is the force of friction, and N is the normal force. Coefficient of ...
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      Apr 14, 2017 — CoF can be vital to the performance of a wrap on a packaging line, particularly on high speed packaging lines. Any tim...
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    • 01:27
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