Fibers

Question 1

Fiber

Answer 1

the smallest unit of a textile

Question 2

Fibers are spun into..

Answer 2

yarns or threads

Question 3

Textile

Answer 3

a flexible, flat material made by interlacing yarns (or threads)

Question 4

What are fibers purpose in forensic science?

Answer 4

to link a crime to a suspect

Question 5

Is fiber evidence direct or indirect?

Answer 5

indirect

Question 6

Is fiber evidence class or individual evidence?

Answer 6

class evidence

Question 7

Is fiber evidence trace evidence?

Answer 7

yes

Question 8

Fibers are a form of

Answer 8

trace evidence

Question 9

Direct transfer

Answer 9

passing of evidence, such as a fiber, from victim to suspect or vice versa

Question 10

Secondary transfer

Answer 10

transfer of evidence, such as a fiber, from a source to a person, and then to another person

Question 11

Fiber evidence is collected using..

Answer 11

tape
forceps
a vacuum
sticky lint roller

Question 12

What is the first step?

Answer 12

identify the type of fiber and its characteristics

Question 13

Natural fibers

Answer 13

come from animals, plants, and minerals that are mined from the ground
fibers are composed of polymers, or long, repeating molecules

Question 14

Animal fibers

Answer 14

fur, hair, and silk

all animal fibers are made of proteins

Question 15

Plant fibers

Answer 15

all plant fibers share the common polymer cellulose

Question 16

Cellulose

Answer 16

made up of simple glucose units

Question 17

Seed fibers

Answer 17

cotton

used for clothing and household textiles

Question 18

Leaf fibers

Answer 18

manila and sisal

Question 19

Fruit fibers

Answer 19

coir obtained from coconuts

waterproof

Question 20

STEM fibers

Answer 20

flax, jute, and hemp

Question 21

Mineral fibers

Answer 21

neither proteins nor cellulose
may not be long, repeating polymers
although it is very durable bc of its health risks
abestos are no longer used

Question 22

Synthetic (manufactured) fibers

Answer 22

half of the fabrics produced today are synthetic fibers
the fibers are produced by joining many monomers together to form polymers
rayon, acetate, nylon

Question 23

Some comparisons

Answer 23

synthetic are stronger
synthetic are not damaged by microorganisms like natural
synthetic fibers can deteriorate in bright sunlight and melt at a lower temp than natural

Question 24

Yarns

Answer 24

fibers too short in their raw state to be used to make textiles may be spun together to make yarns

Question 25

Threads

Answer 25

very thin yarns

Question 26

Identification purposes

Answer 26

forensics scientists analyze twist analyze of yarn

Question 27

Weaving

Answer 27

consists of arranging lengthwise threads (the warp) side by side and close tg

Question 28

Crosswise threads (the weft)

Answer 28

are then woven back and forth in one of several different patterns

Question 29

Weave pattern

Answer 29

the pattern in which the weft passes over and under the warp fibers

Question 30

Thread count

Answer 30

number of threads that are packed tg for given amount of fabric

Question 31

Two ply

Answer 31

two threads: doubles thread count