PPT-Natural and manufactured fibers

DESTINY David Types of Natural fibers Silk Cotton Wool Mohair Cashmere SILK Originated in china Around for 500 years Was only available as an oriental import and only very wealthy people could afford . We complete more manufactured & mobile home inspections than anyone else in Southern California. Particulate and Fiber Composites. Advanced composite – composed of two or more chemically different materials. In most cases the fiber is a reinforcing material separated by an interface from the matrix. What . are Manufactured boards. ?. Manufactured boards are . “man-made” . boards. they do not grow naturally. . Manufactured board are simply . strips or pieces . of wood (chips/dust) glued together and pressed with a heat process to form larger boards or sheets.. . FIBERS. There are . two . types . of fibers:. Natural Fibers . &. . Synthetic . Fibers. NATURAL. FIBERS. Natural Fibers – are produced from sources in Nature such as the following: . 2. Fibers. Are considered class evidence. Have probative value. Are common trace evidence at a crime scene. Can be characterized based on comparison of both physical and chemical properties. . Identification . 1. RheTech, Inc.. Leading Thermoplastics Compounder. Reinforced Polypropylenes, TPO’s and Polyamides. Founded 1969. Privately held; Michigan (Ann Arbor) - based. Four manufacturing facilities in Michigan, Ohio and South Carolina. Where is it?. States with the most manufactured housing. Florida 653,721. Texas 606,424. North Carolina 494,555. California 473,193. Georgia 342,649. South Carolina 306,312. Alabama 269,000. Are considered class evidence. Are common trace evidence at a crime scene. Can be characterized based on comparison of both physical and chemical properties . Fabric. Fabric is made of fibers. . Fibers are made of twisted filaments called yarn.. Natural Fibers. Come from Plants & Animals. Cellulose . fibers. Come from plants. COTTON. . ADVANTAGES. strong, . durable, . absorbent, . washable. DISAVANTAGES. Wrinkles. Shrinks unless treated. Natural Fibers. ______________________________________. ________________________. Come . from plants. COTTON. . ADVANTAGES. strong, . durable, . _______________. washable. DISAVANTAGES. ___________. Chemical Composition of Fibers. Fibers are polymers:. long chains made of simple molecules. Natural Fibers. Wool. Polymer= Polypeptide chains (forming the protein keratin). Monomer= amino acids (one of which is cysteine . . .cysteine contains . UNITY, CONSENSUS, PARTICIPATIONKOTAHITANGAOur people are united, professional and accountable through commitment, comradeship and courage.PRINCIPLES INCLUSIVITYHUI KATOASTEWARDSHIPINTEGRITYKAU TAPATAH Chapter 11. Hair as . Evidence. Human hair is one of the most frequently . found. pieces of evidence at the scene of a violent crime. Unfortunately, hair is not the best type of physical evidence for establishing . papillary muscle by scanning electron microscopy,MATERIAL AND METHODSus scrofain 4% buffered formaldehyde and dissected to expose theleft ventricle cavity. It was excised 24 papillary muscles withfor