353 2 Friction Coefficient Table 2 Max. Incline Angle Unit (degree) Load shape Surface Shape Bulk goods Box Bags Powdered Objects Granulated Substances Solid Cardboard Paper Plastic Bag Angulate Round Empty 5kg Flat surface 15 10 - 5 10 (20) 15 (25) 15 (25) 15 (15) Canvas surface 15 10 - 5 10 (10) 10 (10) 10 (10) 10 (10) Grain (fine) 20 15 - 5 25 (35) 30 (35) 25 (35) 25 (35) Grain (thick) 25 15 5 5 30 (35) 30 (40) 30 (35) 30 (30) Deep groove 30* 15 10 5 30 (40) 30 (40) 25 (40) 25 (45) Shallow groove 30* 15 5 5 30 (40) 30 (40) 30 (35) 25 (25) Vertical groove 20* 15 - 5 25 (40) 25 (40) 25 (40) 20 (35) Rough top 30* 15 10 5 35 (40) 35 (40) 30 (40) 30 (30) Diamond 20 15 - 5 10 (20) 15 (25) 15 (25) 10 (15) Herringbone 30* 15 10 5 40 (50) 40 (50) 30 (40) 30 (30) Basket-weave 20 15 - 5 25 (40) 25 (40) 25 (40) 20 (35) * Data is presented on the assumption that belt surface is soiled with dust, etc. For reference, data in case of clean belt surface is presented in ( ). * Instances of being used for transfer of powdered objects are less, but are given for reference. Representative Transfer Objects Belt Surface Slippery Non-slippery Steel Slippery Non-slippery Plastic Slippery Non-slippery Wood Slippery Non-slippery Cardboard For General Transfer 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 Canvas surface Grain (fine) Grain (thick) Flat surface Vertical groove For Inclined Transfer Canvas surface Grain (fine) Basket-weave Rough top Deep groove Herringbone Flat surface Vertical groove &It is necessary to handle the above figures with care as the friction coefficient greatly varies with the surface condition (surface roughness), and, liquids such as water or adhesion degree of dust. Flat surface Grain (fine) Grain (thick) Deep groove Shallow groove Vertical groove Rough top Diamond Pattern Herringbone Basket-weave Felt 2 Surface Images Flat Belts Technical Data1
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