A high-pressure, laboratory scale press was used to measure the coefficient of friction and the shear stresses between the walls of the press and model wool bales made from high-density polyethylene, jute, and paper/nylon woolpack materials. The effects on press wall friction of pack material, moisture content, lubricants, an anti-slip coating, and a change in fabric structure were examined. The significant benefits of using a wax lubricant containing stearic acid to increase "in-press" densities were confirmed using a commercial three-bale compactor in which farm bales, each containing 200 kg of wool, were compressed to densities approaching 1200 kg/m3.
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