flexible, flat-made by interlacing yarns, threads
What is textile?
must be 100 times longer than its width
What is fiber?
Two general categories of fiber origins.
What are natural and synthetic?
These are derived from cellulose and are mostly plant in origin. The most common type is rayon.
What are regenerated fibers?
Surface scales may be visible, fibers up to 3 inches long with tapered ends.
What is wool?
Alternating warp and weft threads, firm and wears well.
What is plain?
fibers form recognizable patterns
What is a mineral fiber?
fibers travel from a source to a person and then to another person
What is secondary transfer?
Three sources of natural fibers
What are animal, plant, and mineral?
This is added to many natural fibers to provide additional strength. It is found in polar fleece, and wrinkle-resistant pants.
What is polyester?
"Flattened hose" appearance, up to 2 inches long, blunt point
What is cotton?
Weft is woven over three or more warps and then under one, very strong, dense and compact, soft and pliable.
What is twill?
made from a man-made substance such as a plastic
What is synthetic fiber?
harvested from plants, animals, or mineral sources
What is natural fiber?
Five questions that an investigator asks about a fiber sample.
What are
1. type of fiber
2. fiber color
3. number of fibers found
4. where fibers were found
5. where did textile originate
These originate with petroleum products and are non-cellulose-based fibers.
What are synthetic polymer fibers?
This textile will vary widely in cross-sectional shape and diameter, straight to gentle curves.
What is synthetic?
One weft crosses over three or more warp threads, not durable
What is satin?
type of loosely arranged fiber-cotton.
What is amorphous?
long chains of repeating units
What is a polymer?
Sources for plant fibers
What are seeds, stems, leaves, and fruit?
This is easily broken down by light and concentrated acid. It was first introduced as artificial silk, and is a common fiber used in the production of pantyhose.
What is nylon?
Does not taper, yet exhibits small variations in diameter, no internal structures.
What is silk?
Uses two warp threads and a double weft thread, open weave.
What is Leno?
fibers spun together
What is yarn?
type of strong, stiff fiber-flax
What is crystalline?
Sources of natural fibers
What are animal, plant, and mineral?
These are used in performance clothing, are quick drying, and are resistant to wear.
What are olefins?
"Bamboo stick" appearance, straight with angles but not curved
What is flax?
Two weft threads cross two warp threads, doesn't wrinkle open weave
What is basket?
fibers are transferred from victim to suspect or suspect to victim
What is direct transfer?
small molecule that may bond together to become a polymer.
What is a monomer?