how are cross section and diameter fibers controll
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CTD 261
CTD 261
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CTD 261 EXAM 2 REVIEW QUESTIONS
AND ANSWERS 100% ACCURATE
How are cross section and diameter fibers controlled? - ANSWER-shape of spinneret
holes, drawing/stretching
What are the 3 spinning processes? - ANSWER-1- melting/dissolving
2- extrusion
3- hardening
What formation can fibers take when man-made and made of different components? -
ANSWER-1- side by side biscontituent: half the fiber cross section; develop spiral crimp
when exposed to heat/water
2- cover/core: one polymer forms the bulk of the fiber, other polymer forms outer cover;
dye effects & modify fabric hand
3- matrix/fibril: one polymer forms continuous phase, within it form very small fibers
(fibrils); specialty fabric production, microfibers
What happens if you blend fibers? - ANSWER--minimize negative and emphasize
positive characteristics
-interesting color effects
-reduce costs
What are substances that degrade the fiber? - ANSWER-Sunlight, bases, or acids
Which fibers would you not want to use if dyeability was an issue? - ANSWER-
Polyester? Nylon, Olefins, (Moda)Acrylic
What does the cross-section contribute? - ANSWER-Wickability, luster, hiding soil
What is addition in relation to synthetic fibers? - ANSWER-double bonds between 2 C
atoms are broken, reforms a single bond connected 2 monomers
Rayon - ANSWER-irregular
cellulose
wet
Melt Process - ANSWER-forced through spinneret into air; fiber forms by
freezing/cooling
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