Academic journal article Forensic Science Communications

Chapter 12: Manufactured Fiber Examination-Cross Sections

Academic journal article Forensic Science Communications

Chapter 12: Manufactured Fiber Examination-Cross Sections

Article excerpt

General Discussion

This module is intended to familiarize the trainee with various fiber cross-sectioning techniques and the type of information obtained from these techniques. Along with physical shape, cross sections reveal the distribution of internal structures and dye penetration. The trainee will develop proficiency in optical and physical crosssectioning techniques.

Objectives

Upon satisfactory completion of this training module, the trainee will have developed and demonstrated theoretical knowledge and/or practical skills to:

1. obtain satisfactory physical cross sections from single fibers, multiple fibers and fiber tufts;

2. determine the modification ratio of multi-lobed fibers;

3. describe observed fiber features, such as: shape, delustrant, pigment particle distribution, presence and size of spherulites or voids, dye penetration depth, and bi-component fibers;

4. compare and contrast the types and quality of information obtained from optical cross-sectioning versus physical cross-sectioning; and

5. observe the relationship of fiber cross-sectional shape to generic class and end usage.

Training Steps and Check Lists

1. …

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