Study on Effect of Drying Techniques on Area Yield and Quality of Leather

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Drying is an important process in leather making in which tanning agents, dyestuffs and fat- liquoring agents combine with collagen further and water is evaporated to fulfill the demands of final leather product, therefore drying is one of mechanical operation which has signif icant effect on leather chemical and physical properties. Using different techniques of drying in the processing of Garment leather affect the change in the area yield of the leathers as distinct from each other’s. The area yield has great significance for the commerce since the price of piece of finished garment leather is sold based on its area yield. In this research, the effects of normal, toggle and vacuum drying techniques on the area yield of garment leather and the quality of the garment leather dried under each techniques of drying characterized based on moisture content, softness, tensile strength and elongation at break, subjective property and Scanning Electron Microscope (SEM) analysis was studied. Moisture content, softness and tensile and elongation at break of leather steadily decrease with increase in drying period and area yield. More porous and less adhesion of fibre is obtained by toggle drying techniques and some grain surface damages observed in vacuum drying techniques from microscopic images. Toggle drying techniques for drying of garment leather is preferable drying techniques because of the better area yield of 14.5% with good tensile strength and more porous leather.



Drying techniques, Area yield, Garment leather, Softness