Fiber Challenge

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.
True or false?

True

Synthetic polymer fibers, which all originate with petroleum products, are cellulose-based fibers.
True or False?

False

Polyester has properties similar to nylon except it is easily broken down by light and concentrated acid.
True or False?

False

A disadvantage of manufactured fibers is that they can deteriorate in bright sunlight and melt at a lower temperature than natural fibers.
True or False?

True

Fibers are woven into textiles or fabrics.
True or False?

True

A small molecule that may bond to other monomers to become a polymer is a

monomer

When fibers are transferred directly from victim to suspect or suspect to victim, this is called:

direct transfer

The transfer of evidence such as a fiber from a source to a person, then to another person, is called:

secondary transfer

Two methods that can analyze fibers without damaging them are:

polarizing light microscopy and infrared spectroscopy

Fibers are classified as either

natural fibers or synthetic fibers.

Natural fibers come from

All of these choices.

Early collection of fibers in an investigation is critical.  Within 24 hours, what percent of all fibers may have fallen from a victim or been lost from a crime scene?  (Enter the number only to move on.)

95%

Natural plant fibers are produced from:
A.seeds

B. fruits

C. stems and leaves

D. All of these choices

D

One seed fiber is:
A. cotton

B. coir

C. hemp

D. jute

A

Fiberglass is a fiber form of:
A. proteins

B. glass

C. cellulose

D. polymers

B

Until the nineteenth century, only plant or animal fibers were used to make clothing and textiles.  Half the fibers produced today are synthetic.  They are categorized as:

regenerated fibers and synthetic fibers.

All plant fibers share the common polymer that is:

cellulose

The simplest weave pattern is the plain, or _______________________, weave. (byabt)

tabby

Fiber evidence is gathered with:

vacuums, tape, forceps, lint roller

What weave?

satin

What weave?

twill

What weave?

plain

What weave?

basket