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Fibers and Textiles

Chapter 4 review

Gabbriel Lewis

on 24 January 2013

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Transcript of Fibers and Textiles

By: Gabbriel Lewis Fibers And Textiles Fibers are used in forensic science to create a link between crime and suspect. Unlike DNA evidence and fingerprints, fibers are not specific to a single person. Fibers are a form of trace evidence. How Forensic Scientists Use Fibers.. Introduction to Fibers It is important to evaluate fiber evidence because it is so plentiful in the environment. The value of fiber evidence in a crime investigation depends on its potential uniqueness. For instance... Fiber Classification Fibers are classified as either natural fibers or synthetic fibers. It is important for a forensic scientist to be able to distinguish between different kinds of fibers because this can reveal critical information about the suspect and his or her environment. NATURAL FIBERS Natural fibers come from animals, plant, and minerals that are mined from the ground. SYNTHETIC FIBERS.. Half of the fabrics produced today are synthetic fibers. They are categorized as regenerated fiber and polymers. CASE STUDY... CAREERS IN FORENSICS.. When fibers are transferred directly from victim to suspect or suspect to victim it i called direct transfer. if the victim has fibers that he/she have picked up then transferred from victim to suspect this is called secondary transfer. Forensic scientists wants to know: Type of fiber,
Fiber color, number of fibers, where the fiber was found, textile the fiber originated from, multiple fiber transfers, type of crime committed, and time between crime and discovery of fiber.. Sampling And Testing Fiber evidence is gathered with special vacuums, sticky tape, and forceps. It is important to be very accurate in recording where the fibers are found. Inaccurate or incomplete recording may cause evidence to be inadmissible in court. Animal fibers provide fibers from three sources: hair, fur, and, webbing. All animal fibers are made of proteins. They are used in clothing, carpets, and decorative hangings such as curtains and bedding, Plant fibers are specialized plants cells. They are grouped by the part of the plant from which they come. Seeds, fruits, stems, and leaves all produce natural plants fibers. Seed fiber cotton is found in the seedpod of the cotton plant . Fruit fibers coir is a coarse fiber obtained from the covering surrounding coconuts, Stem fibers hemp, jute, and flax are all produced from the thick region of plant stems. Leaf fibers Manila is a fiber extracted from the leaves of abaca, a relative of the banana tree. Mineral fibers are neither proteins not cellulose. They may not even be long, repeating polymers. Regenerated fibers are derived from cellulose and are mostly plant in origin. The most common of this type is rayon. Synthetic polymer fiber originate with petroleum products and are non-cellulose-based fibers. Polyester
Olefins COMPARSION The synthetic fibers are stronger than the strongest natural fibers. Unlike natural fibers, man-made fibers are not damaged by micro-organisms. YARNS AND TEXTILES In 1982, Jenny Reiler was kidnapped, raped. She had escaped from the sadistic killer and reported him. At the police station they gave a rape kit and they collected evidence from her. They found blue foreign hairs in her head. They then began comparing it to fibers found at unsolved murders in their local county. They came to the conclusion that this was a serial killer on their hands. They started researching fibers that were similar to the blue fibers and realized it came from a specific brand van. With the model of the car they released it to the media. After many witnesses reported seeing a suspicious van...the investigators linked it to their APB of the van. They later found the serial killer. By: Fushia fiber specialist salary
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