Polyester Background Polyester is a synthetic fiber derived from coal, air, water, and petroleum. Developed in a 20th-century laboratory, polyester fibers are formed from a chemical reaction between an acid and alcohol. In this reaction, two or more molecules combine to make a large molecule whose structure repeats throughout its length.
Wool Quality and Grades The attributes of wool include fineness, length, crimp, color, strength, uniformity, and in grease wool, percentage of foreign material. Fineness is considered the most important. The spinning count and blood systems are used for grading wool according to fineness.
The spinning count system is the basis of percent USDA grades, even though the blood system is well known and used. The USDA does not provide a grading service, but the standards are used as guidelines in virtually all buying and selling.
Originally, the blood system was an indicator of the fraction of Merino breeding in the animal from which the wool came. Since the development of other distinct breeds, the original blood system simply has been adapted to describe relative fineness.
Fineness is important because it allows the spinning of a finer yarn, tighter weaving of cloth, and production of lighter fabrics and garments, Fine wool often has more crimp, too, another attribute of wool quality.
Crimp helps individual fibers cling together during spinning, so that a strong yarn can be woven with fewer fibers lying parallel, Crimp, then, also contributes to lighter-weight garments and more efficient wool use.
Fine wool often has fifteen or more crimp per inch; coarser wool has less. Wool from the back usually has more crimp than wool from the thigh.
Length of fiber is a quality factor.
Though fine fleeces usually have relatively short fibers, the longer the better. This wool, therefore, can only be carded and is destined for use in tweeds and other fuzzy fibers.
Since it cannot be effectively combed, it may be used for felt or similar materials. Traditionally, experienced buyers and sellers, who rather accurately estimate fineness, length, shrinkage, and other quality characteristics, have appraised wool quality for sale purposes.Synthetic fiber is widely used in every day life except humans wear.
Comperatively less durable than synthetic fiber. Synthetic fibers are more durable than natural fiber. Cotton fiber length is measured and reported as the upper half mean length (average length of the longest 50% of fibers) to an accuracy of one hundredth of an inch. Cotton Fiber Strength Fiber strength is measured by breaking the fibers held between clamp jaws.
It’s reported as grams per tex, which is the force in grams required to break a. Wool deserves a spot in every man’s closest and in his survival bag.
The story behind wool – such an innocuous everyday material – is fascinating. It starts with the fiber’s discovery. Wool fiber is hollow which allows for excellent air circulation making it both warm in the winter & cool in the summer.
Wool fiber is naturally resistant to odors making it . Photo from CNN Forensic Fiber Analysis Case Study The best-known, if not the best-reasoned fiber case in American legal history involving fiber evidence issues is the Wayne Williams trial growing out of the famous Atlanta murders of twelve African-American males in Fiber can be used to relieve mild-to-moderate diarrhea, and soluble fiber soaks up water in the digestive tract, which makes stool firmer and slower to pass.
Lipids include compounds such .