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PCC 302 Exam 1 Questions & Answers
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PCC 302 Exam 1 Questions & Answers Describe the 3 main stages of wet processing of textiles and the primary goals of preparation. 1. Preparation 2. Coloration 3. Finishing Describe what batch and continuous processes are and how they are characterized. Based on these characteristics, be ab...

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  • October 28, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • pcc 302 exam 1 questions answers
  • describe the 3 main stages of wet processing of te
  • describe what batch and continuous processes are a

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PCC 302 Exam 1 Questions & Answers
Describe the 3 main stages of wet processing of textiles and the primary goals of
preparation. - answer 1. Preparation 2. Coloration 3. Finishing

Describe what batch and continuous processes are and how they are characterized.
Based on these characteristics, be able to recognize textile wet processes as being
either batch or continuous. - answer Batch process- process where the entire batch
of dry fabrics contacts the entire amount of treatment bath. %owf
Continuous process- process where the dry fabric only contacts a portion of the entire
treatment bath. %owb

Name three types of batch processing machinery. - answer Beck, Jet, Jig, Package
(yarn)

Describe the objective of slashing and which yarns are treated. List three main
properties of a well sized yarn. - answer - to improve weaving efficiency of the yarn
by preventing damage of fibers due to friction and mechanical forces
- 3 main properties: higher tensile strength, lower elongation, more rigid less flexible

Describe at least three requirements of a good warp size. - answer 1. good adhesion
2. strong flexible and abrasion resistant
3. water soluble

Amylose - answer - soluble in warm water
- straight polymer chain

amylopectin - answer - insoluble in water
- branched polymer chain

Compare the differences in structure between amylose and cellulose. - answer
cellulose - has beta links, repeat unit for cellulose has two rings
amylose- repeat unit for amylose has one ring, alpha links

PVA - answer - water soluble
- more expensive than starch
- can recycle PVA
- easy to prepare and remove

Name two benefits and two potential problems in fabrics that have been singed. -
answer Benefits- improved fabric appearance, less easily soiled
Problems- permanent streaks if fabric is singed unevenly or has creases, potential
thermal damage to heat sensitive fibers

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