الفهرس 
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Abstract
summary
Utilization of Egyptian cotton in producing fine yarns with high quality to be exported would provide great economical advantages allowing Egypt to dominate world market since there would be no strong competition in this respect from countries
producing yarns.
Yarn manufacturing is a sequence of processes that convert bales of cotton into a textile material to be used in a variety of purposes. Beginning with a dense package of tangled fibers that contain varying arnounts of foreign matter, trash, motes etc., a number of processes are required to obtain the clean, strong,
unifonn yarns consumed in modern textile markets. The cotton fiber-to-yarn conversion system consists of several operatious that must work in a coordinated and integrated fashion to achieve two main objectives: a) good processing perfonnance of material and b) high-quality levels of end prodUct at the lowest cost possible.
These objectives can be fulfilled by the construction of optimal cotton blends. The first step in this (construction) is to model the spinning process, ie, To describe the relationships between cotton blend, process conditions and process behavior as well as yarn properties. The second step is to find the cotton blend and process conditions that allow spinning the required yarn at the best price.