Textiles theory 1.2

• What is a property of yarn related to strength?

  Strength at low level heats
• What is single yarn made of?

  Short staple or filament twisted together
• Why must staple yarn be carded or combed?

  To ensure fibers lie in the same direction
• What must be done to long filaments before spinning with staple yarn?

  They need to be cut to staple
• What are the characteristics of staple yarn?

  Hairy, good at trapping air and moisture
• How are filament yarns created?

  By twisting continuous long fibres
• What is a monofilament?

  Made from 1 continuous filament
• What is a characteristic of monofilament yarn?

  It is insulating and has less mass
• What is plied yarn?

  A yarn made by twisting single yarns together
• How does the number of strands in plied yarn affect its strength?

  More strands make it stronger
• What does twisting single yarns in opposite directions achieve?

  Gives even thickness with no weak places
• What are corded yarns used for?

  To provide strength for embroidery needles
• What are core spun yarns?

  A multi-component yarn with a central core
• What is a practical use of core spun yarns?

  Used for stretch in sewing thread
• How can cotton in core spun yarns function practically?

  As an insulator preventing machine overheating