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A factorial experiment performed on the aqueous compression-jet scour with three independent variables is reported. These variables were the feed-rate of greasy wool, the speed of the layer of wool, and the jetting pressures. The wools were processed to gilled slivers, on which mean-fibre-length determinations were made. The effects of the independent variables on the dependent variables of residual grease and dirt and mean fibre length (the last-named being a measure of the degree of entanglement of the scoured wool) were evaluated. The results obtained indicated the operating conditions to be used to achieve the optimum production capacity. [ABSTRACT FROM AUTHOR]

The equations representing the changes in the concentrations of the contaminants in scour liquors that were developed in Part 1 of this series are applied. The investigation of the optimum conditions of liquor reclamation took the form of two scouring trials. The results of these trials gave the recovery and removal efficiencies of the reclamation units and showed that two centrifuges in parallel very efficiently removed the grease and dirt contaminants from the scour liquor. The investigation of the determination of equilibrium conditions of the contaminants in the scour liquor consisted in scouring wool for 6 hr without back-flow or liquor reclamation. The results showed that effective continuous scouring was feasible. Experimental results of contaminant concentrations in the liquors compared favourably with the predicted values obtained from equations. [ABSTRACT FROM AUTHOR]

An investigation is described in which the quality of scoured wools was assessed by their residual-grease and dirt contents, colour, and mean fibre lengths. Two types of wool were scoured in two sets of experiments with varying jetting pressures, detergent-builder concentrations, liquor temperatures, and contaminant concentrations in the liquors. One of these types of wool was scoured conventionally as a control measure. It was found that the dinginess of the scoured wool depended solely on its residual-grease content, which could be kept at a low level by suitable additions of detergent to the scour liquors. The fibres in the slivers of conventionally scoured wool were shorter than, and had the same colour characteristics as, those of a similar wool that had been scoured in the aqueous compression-jet scour. [ABSTRACT FROM AUTHOR]

Equations of concentrations of contaminants in scour liquors in the approach to, and at, equilibrium conditions are developed. These equations are applied to the case of passing through a centrifuge system scour liquor containing recoverable and non-recoverable grease and removable and non-removable dirt. Operating factors of scouring are discussed in relation to the equations developed. The laboratory techniques used in analysing samples of the scoured wool, the liquor, and card sliver from the pre-optimization trial are described. Changes in operating procedure for the aqueous compression-jet scour and a schedule of optimization trials to follow are recommended after an analysis of the results of the pre-optimization trial. [ABSTRACT FROM AUTHOR]