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forensics ch. 4
Term | Definition |
---|---|
amorphous | without a defined shape; fibers composed of a loose arrangement of polymers that are soft, elastic, and absorbing |
crystalline | regularly shaped; fibers composed of polymers packed side by side, which makes it soft and strong |
direct transfer | passing of evidence, such as a fiber from victim to suspect or vice versa |
fiber | smallest indivisible unit of a textile; it must be at least 100x longer than wide |
mineral fiber | collection of mineral crystals formed into a recognizable pattern |
monomer | small molecules that may bond with other monomers to become a polymer |
natural fiber | fiber produced naturally and harvested from animal, plant or mineral sources |
polymer | substance composed of long chains of repeating units |
synthetic fiber | fiber made from man-made substances such as plastic |
secondary transfer | transfer of evidence such as a fiber from a source to person and then to another person |
textile | flexible flat material made by interlacing yarns or threads |
yarn | fibers that have been spun together |
5 types of weaves | plain, basket, satin, twill, leno |
regenerated fiber | derived from cellulose and are mostly plant in origin |
polyester | common synthetic fiber added to natural fibers to provide additional strength |
nylon | similar to polyester except easily broken down by light and concentrated acid |
acrylic | often found as artificial wool or imitation fur; inexpensive |
olefin | used in high performance clothing; quick drying and resistance to wear |
animal fiber | provide fibers from 3 sources- hair, fur, and webbing |
plant fiber | specialized plant cells |
seed fiber | cotton |
fruit fiber | coir |
stem fiber | hemp, jute, and flax |
leaf fiber | manila |