Continuous centrifuging of sheepskins
Thesis DisciplineMechanical Engineering
Degree GrantorUniversity of Canterbury
Degree NameDoctor of Philosophy
One stage in the processing of sheep and lamb skins in New Zealand freezing works is the removal of water from the woolly skin after washing. Neither of the two systems used at present to achieve this reduction in moisture content is entirely satisfactory. Passing the skin between pressure rollers often results in damage to the skin or wool. Batch centrifuging in manually loaded and unloaded "hydros" (basket centrifuges) involves high labour and capital costs. Initial investigation into alternative methods of water removal indicated that an automatic continuous centrifuging system could be economically preferable to the existing processes. This thesis describes the design and development of machines constructed with the ultimate aim of producing a commercial continuous centrifuge capable of automatically effecting the required water removal. Two full size machines were designed and constructed. The second machine was developed to the stage where reliable skin control was achieved, and the principle of operation could form the basis for the design of a successful commercial machine. The effect on wool moisture content of variations in centrifuging parameters was investigated.