Flashcards on Textile Structures and Production Processes
Textile Structures and Production Processes: A Student Guide
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Yarn Production
38 cards
Card 1
Question: What is the purpose of the roving (simplex) stage in yarn production?
Answer: To further attenuate the sliver and add a slight twist, producing roving as an intermediate product that increases uniformity.
Card 2
Question: What are the main actions during the spinning stage?
Answer: Final drafting and twisting to form yarn, resulting in a continuous yarn with required properties.
Card 3
Question: State the principle of ring spinning.
Answer: Fibers are drawn and twisted by a rotating spindle.
Card 4
Question: List three properties of yarn produced by ring spinning.
Answer: High strength, good quality, but higher production time.
Card 5
Question: How does rotor (open-end) spinning form yarn differently from ring spinning?
Answer: Fibers are fed into a rotating rotor and yarn is formed without a roving stage.
Card 6
Question: Give three properties of rotor (open-end) spun yarn.
Answer: Lower strength, higher productivity, and more economical.
Card 7
Question: What is the principle of air-jet spinning?
Answer: Fibers are twisted using air streams, forming core fibers with outer wrapping fibers.
Card 8
Question: What are typical properties of yarn from air-jet spinning?
Answer: Low hairiness, smooth yarn, but lower strength.
Card 9
Question: How does friction spinning produce yarn and what are its typical properties?
Answer: Fibers are twisted by friction drums; produces bulky yarns with low strength used mainly for technical yarns.
Card 10
Question: Name five key factors that affect yarn quality.
Answer: Fiber length and fineness, fiber cleanliness, drafting process, twist level, and spinning method.