Spinable Characteristics of Ecotype Sudan Desert Sheep Wool


By Elfadil Mahmoud Mohamed Ahmed Elkarsany, Abdel Rahim Mohamed Ahmed.


The study focuses on finding the spiniable characteristics of Ecotype Sudan Desert Sheep wool. The normal color of the Ecotype Sudan Desert Sheep wool is ‘Abrag’ spotted (red / white or black / white), or ‘Hamra’ red. The fleece was divided into two groups: group (A) which represents the fleece of first sheering (Eiga) and group (B) which represents the fleece of second sheering (Khilfa). Then each group was studied by taking samples, scouring them by using carbon tetrachloride (CCL4). The SEM micrograph shows that the overlapping surface cell or scale structure in characteristic longitudinal view at 594 X magnifications. The approximate number of surface cells or scales in a length of 254.2 microns is 25 – 35 scales. A dark band/canal type shade is observed along the length of the wool fiber as shown in the photograph indicating ‘Medulla’ presence. The fineness of the fiber examined is between 87.1 – 95.8 microns. By using the metallurgical microscope – NEOPHOT 32, the fiber length is between (27 – 28) millimeters. Using the Stelometer the tenacity of the fiber examined is between (5 – 6) grams per Tex. In common with other textile fibers, wool absorbs water from moist atmosphere. Also the study shows that when wool is dried from regain below saturation, its absorptive power decreases with increasing temperature of drying. Wool can dissolved completely when treated with Acetic acid (6N NaOH). It is observed that both samples (A&B) decolorized when treated by reducible bleach. Fiber degradation takes place when using oxidisable bleach and the loss in mass is less than 4%. The effective method for bleaching dark pigmented wool is reduction followed by oxidizing process. Addition of formaldehyde is essential for reducing fiber degradation. Ecotype