Abstract
AbstractEquipment is described in which pastes are squeezed out from the region between two parallel circular discs. The force on the upper disc is measured for different fixed approach speeds of the discs. Two disc diameters are used, in conjunction with two ceramic pastes and one model paste. Different surface finishes are used on the discs and the effects of adding glass fibre and alumina fibre to the pastes are examined. Industrial squeezing flows are found in such processes as filtration, pressing, rolling, and injection moulding. A theory for squeezing flow is given which shows that, under certain conditions, a plot of squeezing force against the reciprocal of gap will be a straight line. The conditions are that the shear stress is constant and that the flow is dominated by shear forces. This is shown to occur in many real cases, although the biaxial extension of the bulk material also affects the load. It is shown that, for ceramic pastes, plate velocity has little effect on the force. For all past...
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