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Fiber Analysis

QuestionAnswer
What kind of evidence is fiber class eviedence
2 types Natural and Man Made
Natural Fibers Can come from, animal, plant, or mineral.
Man Made Fibers Can come from synthesis or regenerated. (Lab)
Most common plant fiber Cotton
Most common animal fiber Wool
Most common mineral fibers fiberglass/asbestos
How many fibers are synthetic fibers more than half
Examples of synthetic fibers nylon, acrylic, polyester, olefin
Cross section of synthetic fibers rarely round or uniform
Polymer heavy molecule formed by joining together a large number of molecules of low molecular weight (monomers)
Regenerated Fibers made from chemically altering a natural polymer (cellulose)
Examples of regenerated fibers Rayon, Acetate, Triacetate
Examining Fibers Techniques Microscopic Analysis, Physical Analysis, Microchemical Analysis.
Microscopic Analysis Color, Texture, Diameter, Shape pattern, Cross section appearance, Surface characteristics
Physical Analysis Used when larger pieces are available, stretch strength, density
Microchemical Analysis Usually destructive, burn analysis, acid/base testing, solubility, infrared and visible spectral analysis
Identification Tools Microscope, flame test, chemical tests, chromatography, stain test, UV test.
Microscope fibers appear differently
Flame Test how a fiber burns/melts/ashes
Chemical Tests Acid/Base dissolve test
Chromotography Identify pigments in fabric
Stain Test Does the fabric take a dye?
UV test Does the fabric glow in blacklight?
Animal Hair Test Result Flame - smells like burnt hair, Acid - silk dissolves, Base - wool dissolves.
Plant Test Result Flame - smells like burnt paper, Acid - dissolves all plants
Mineral Test Result Flame - does not burn, Acid - dissolves Fiberglass
Synthetic Fibers Test Results Flame - melts, Acid - dissolves nylon
Regenerated Fibers Test Results Flame - melts, Acid - dissolves
Fabric Weave Patterns Plain, Twill, Satin
Plain (Tabby) weave pattern Most common, over one under one, snag resistant, wrinkles
Twill weave pattern Used in jeans, diagonal texture, over 2/3 and under 1, durable, dense, compact
Satin weave pattern 3/4/5/6 over to 1, smooth on one side and dull on other, tends to snag/break
Created by: evamarygarcia
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