Besides the sheath-core bicomponent fiber used as a crimping fiber, these fibers are widely used as bonding fibers in Nonwoven industry. The sheath of the fiber is of a lower melting point than the core and so in an elevated temperature, the sheath melts, creating bonding pints with adjacent fibers - either bicomponent or monocomponent. The first commercial application of sheath-core binding fiber (I.C.I. Heterofil, [13]) has been in carpets and upholstery fabrics. The newest trend in bicomponent fiber production is to focus on tailoring a fiber according to the customer's needs. A considerable emphasis was put on the processing optimization (depending strictly on machinery used) and on the desired look of the final product. It appears that concentricity/eccentricity of the core plays an important role. If the product strength is the major concern, concentric bicomponent fibers are used; if bulkiness is required at the expense of strength, the eccentric type of the fiber is used [14]. Other uses of sheath-core fibers derive from characteristics of the sheath helping to improve the overall fiber properties. A sheath-core fiber has been reported [15] whose sheath is made of a polymer having high absorptive power for water, thereby having obvious advantages for use in clothing. Other sheath-core fibers showed better dyeability [16], soil resistance [17], heat-insulating properties [18], adhesion [19] etc. Production of ceramic sheath-core bicomponent fibers is another application utilizing the difference of sheath and core [20]. The fiber precursors are first spun in a sheath-core arrangement and then cured by oxidation, UV and electron beam, heating or by chemical means. These fibers are used as a composite reinforcement.