Podcast
Questions and Answers
What is NOT a method used to produce elastomeric stretch yarns?
What is NOT a method used to produce elastomeric stretch yarns?
- Stuffer box method
- Texturization process (correct)
- Filament wrapping
- Core spinning
Which process can increase bulk in yarns from 100 to 300 percent?
Which process can increase bulk in yarns from 100 to 300 percent?
- Core spinning
- Air Jet method (correct)
- Texturization process
- Friction spinning
What structure does a compound yarn primarily consist of?
What structure does a compound yarn primarily consist of?
- Single type of fiber
- Twisted staple fibers
- Core-wrap fiber strands (correct)
- Core-spun without wrap
Which spinning systems are commonly used for producing core-sheath yarns?
Which spinning systems are commonly used for producing core-sheath yarns?
What can be said about the resulting fabrics made from bulk yarns?
What can be said about the resulting fabrics made from bulk yarns?
What type of yarn refers to two or more single yarns twisted together?
What type of yarn refers to two or more single yarns twisted together?
Which yarn classification emphasizes the processes involved in their production?
Which yarn classification emphasizes the processes involved in their production?
What benefit do folded or plied yarns provide compared to single-ply fabrics?
What benefit do folded or plied yarns provide compared to single-ply fabrics?
What are novelty yarns primarily composed of?
What are novelty yarns primarily composed of?
Which process involves using a 'two-ply' yarn for both warp and weft?
Which process involves using a 'two-ply' yarn for both warp and weft?
What characterizes slub yarn?
What characterizes slub yarn?
What type of yarn would typically be used to create fabrics less prone to wrinkling?
What type of yarn would typically be used to create fabrics less prone to wrinkling?
Which of the following is NOT a characteristic of simple yarns?
Which of the following is NOT a characteristic of simple yarns?
What is the primary purpose of the texturization process in synthetic yarns?
What is the primary purpose of the texturization process in synthetic yarns?
Which of the following best describes the characteristics of heat-set thermoplastic stretch yarns?
Which of the following best describes the characteristics of heat-set thermoplastic stretch yarns?
Which type of yarn is produced using elastomeric materials such as Lycra or spandex?
Which type of yarn is produced using elastomeric materials such as Lycra or spandex?
What are the textures that can be imparted to yarns through the process of texturization?
What are the textures that can be imparted to yarns through the process of texturization?
What is a common application for stretch yarns produced by heat-setting?
What is a common application for stretch yarns produced by heat-setting?
How does texturization affect the appearance of yarns?
How does texturization affect the appearance of yarns?
Which of the following methods is NOT mentioned as a process for producing stretch textured yarns?
Which of the following methods is NOT mentioned as a process for producing stretch textured yarns?
What characteristics of synthetic yarns were originally reduced by texturizing processes?
What characteristics of synthetic yarns were originally reduced by texturizing processes?
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Study Notes
Classification of Yarns by Process
- Yarns are categorized based on processes involved in their production, including Cotton, Wool, Stretch, Compound, Core-sheath, and Novelty yarns.
Types of Yarns
- Types include simple yarns (single, multiple, plied/folded, cable) and stretch yarns, with considerations for spun or filament yarn.
Simple Yarns
- Single Yarn: Consists of one strand without twisting.
- Multiple Wound Yarn: Two or more single yarns twisted together.
- Folded or Plied Yarn: Made by twisting two or more folded yarns.
- Cord/Cables: Composed of multiple wound yarns, typically used in ropes and cables.
Fabric Weaving Applications
- Multiple wound yarns serve as weft yarn in special weaves like the Oxford weave, utilizing double yarns with no twisting.
Ply Fabrics
- Single-Ply Fabric: Made directly from spun yarn.
- Two-Ply Yarn: Contains two twisted strands, enhancing quality such as drape and softness.
- Two-Ply 2×2 Fabric: Both warp and weft are two-ply.
- Two-Ply 2×1 Fabric: Only one yarn (warp or weft) is two-ply.
Advantages of Folded/Ply Yarn
- Produces softer fabrics with a silkier feel, lower bending rigidity, better draping, and reduced wrinkling in formal shirting.
- Strengthens sewing threads by reinforcing weak spots.
Novelty or Fancy Yarns
- Novelty yarns are defined by a base yarn, an effect strand, and a binder yarn.
- Slub Yarn: Features intentionally thicker sections for a natural appearance.
- Textured Yarns: Include Stretch and Bulk Yarns, modified for various textures and characteristics.
Texturization Process
- It involves heating untextured yarns to create patterns like crimp, curl, or loop, enhancing bulk and stretch.
- Originally developed for synthetic fibers to reduce gloss, increase warmth, and improve absorbency.
Stretch Yarns
- Comprised primarily of heat-set thermoplastic and elastomeric types.
- Heat-Set Thermoplastic: Achieves 300-500% elongation, suitable for form-fitting garments like swimsuits.
- Elastomeric Stretch Yarns: Created using materials like Lycra or spandex, not via texturization but through methods like core spinning.
Bulk Yarns
- Created using methods such as gear crimping and air jet processing to increase bulk by 100-300% with minimal stretch.
- Commonly used in carpets and lightweight, warm sweater fabrics.
Compound or Core-Sheath Yarns
- Consist of a core-wrapped structure combining different fiber strands for unique characteristics.
- Types include covered-spun and core-spun yarns, produced via various spinning systems like ring spinning or air-jet spinning.
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