Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading…
Transcript

Synthetic Fibers

Synthetic fibers are any of various man made textile fibers usually including those made from natural matter.

examples: polyester, ozone, acrylic, nylon, and rayon

These fibers have very enhanced durability in

comparison to natural materials because they originate from chemical sources.

Synthetic Fibers Facts

  • More than half of all fibers are man-made/synthetic.
  • Polyester and nylon are the most common types of manmade matereals.
  • Typically, if a unique and uncommon fiber is found, the make and model can be identified as well as the age. The manufacturer can be cotacted and data sheets can be sent to the forensic scientists showing how many units were purchased an from where. This could be a possible lead.
  • Man-made are fibers that are produced by combining polymers or small molecules.

Natural

Fibers

natural fibers: substances produce by plants and animals that can be spun into filament such as thread or rope

Man-made Fibers

examples-- cotton, linen, silk, wool, angora (rabbit fur), cashmere, and mohair

The third subcategory of fibers is man-made fibers. While basically the same as synthetic fibers when standing alone (because synthetic and man-made are synonyms), synthetic fibers are a mix of natural and man-made fibers.

cotton fibers are the most common types of fibers to find in a crime scene-- the most common type of fiber used in production of clothes is wool ,which typically comes from sheep-- camel and alpaca wool can also be used in clothing production

Most fibers are analyzed under a microscope in the forensic laboratory. Pre-analysis they are brought to the lab in vials, tubes, and grip seal bags to prevent contamination.

identification of unique animal furs would be important and significant

How Are Fibers Analyzed? + more on gathering

Most fibers are found at the autopsy stage, where the victim's clothing is searched for fibers thatt do not match the fibers of their clothing. They also check under the fingernails for DNA and fiber samples from a possible attacker which could narrow down the field of suspects.

What Are Fibers And Where Are They Found?

Fibers are "thread like elements from fabric or other materials such as carpet" and are essential in the investigation of a crime scene. They come in three different types-- synthetic, natural, and man-made.

Fibers are tricky to find and quick to get blown around in a crime scene, so investigators typically inspect the area around the body first and then examine possible weapons as well as exploring the victim's clothing for hairs. The bottom of shoes are also looked at to check for carpet fibers lodged in the sole. All of this must be done in a timely manner to avoid cross-contamination and displace- ment of possible evidence.

The Use of Fibers in Forensics

How Are Fibers Gathered?

Fibers cling to clothing and other materials, but easily fall off. When investigators enter a crime scene, they pinpoint the most likely places to find fibrous materials-- common areas are around the victim's body or under it.

Fibers are collected using tweezers or the investigators will vaccuum an area and sort the fibers out at the lab. They are separately bagged for transportation to a forensic facility for further analysis . Using tape as an adhesive is also used but it isn't a popular method due to its "destructive nature".

by vanessa vassileva, anna schneider, and emma earnest

True or False

1) Natural fibers can be made into filament.

2) All fibers are man made.

Sources

3) Fibers are essential in criminal investigations

www.merriamwebster.com

www.globalspec.com

www.asdreports.com

4) Fibers tend to not fall off easily

5) synthetic fibers are a mix of natural and man made fibers

http://www.forensicsciencesimplified.org/trace/how.html

http://www.exploreforensics.co.uk/hair-and-fibres.html

http://www.ballyribbon.com/fibers/man-made/

Learn more about creating dynamic, engaging presentations with Prezi