TT25C05 Technology of Yarn Spinning II – Semester IV – Textile / Handloom – R-2025

Subject Code & Name: TT25C05 – Technology of Yarn Spinning II

Regulation: R-2025

Semester: IV (Fourth Semester)

Branch: B.Tech. Textile Technology (Textile) / B.Tech. Handloom and Textile Technology (Handloom)

Credits / L-T-P: 3 Credits | L-T-P: 2-0-2

Course Objectives

• To enable the students to learn Theory of yarn formation by different spinning systems Construction of yarn spinning machines and prepare yarn using ring and rotor spinning machine.

Full Unit-wise Syllabus

Unit I – Ring Spinning - I

Principle of yarn formation in ring frame - drafting, twisting and winding; mechanism of cop building, top arm loading; calculations of draft, twist, production; influence of fibre characteristics on yarn quality and machine performance

Practical: 1. Material passage and construction details of ring spinning machine 2. Identification of components of ring frame 3. Gearing arrangement and draft, twist and production calculations of ring spinning machine 4. Study of builder mechanism of ring spinning machine

Activities: Norms for spinning process, spinning calculations using spreadsheet, solving of GATE questions.

Unit II – Ring Spinning – II

Design features of important machine elements of ring frame – ring, traveller, spindle, drive arrangement; automations; condensed yarn spinning – principle, different methods and yarn properties; comparison with ring spun yarn; ring yarn defects – causes and remedies, preparation of spin plan.

Practical: 1. Selection of draft, twist, winding parameters and changing in the machine 2. Production of yarn using ring spinning machine

Activities: Spin plan for various counts using spreadsheet, Process variables in builder mechanism, solving of GATE questions.

Unit III – Rotor Spinning

Principle of open end spinning; principle of yarn production by rotor spinning system; design features of important elements used in rotor spinning; techno economic study of rotor spinning; influence of fibre characteristics on yarn quality and machine performance; rotor yarn defects – causes and remedies

Practical: 1. Material passage and construction details of rotor spinning machine 2. Draft, twist and production calculations in rotor spinning machine 3. Production of yarn using rotor spinning machine

Activities: Process parameter of production of different rotor yarns, solving of GATE questions.

Unit IV – Other Spinning Systems

Friction, air-vortex, two nozzle air-jet, self-twist, core, wrap, adhesive, electrostatic, disc spinning systems – principle, raw material requirement, yarn structure, properties and applications.

Activities: Comparison of yarn structures, properties and applications, solving of GATE questions.

Unit V – Plying and Fancy Yarn Spinning

Merits of plying of yarns; methods followed for plying – TFO, ring twisting; selection of twist level for plying; calculation of resultant count of plied yarns; fancy yarns- types, method of production; property requirements and production of sewing threads; safety measures in spinning mill.

Practical: 1. Material passage and construction details in TFO machine 2. Twist, production and ply yarn count calculation in TFO Production of doubled yarn using TFO

Activities: Collections of fancy yarns, safety measures, recycling.

Course Outcomes (COs)

• CO1: Understand the theory of yarn formation, constructional features of ring spinning systems, and calculate draft, twist, and production parameters.
• CO2: Apply the principles of ring and compact spinning systems to analyze the functions of spinning elements and process parameters.
• CO3: Analyze the mechanism of yarn formation in rotor spinning systems and determine draft, back doubling, twist, and production characteristics.
• CO4: Evaluate different spinning systems based on yarn formation principles, production limitations, yarn structure, and quality characteristics.
• CO5: Evaluate and select suitable methods for the production of ply yarns and fancy yarns to meet specific end-use requirements.

Assessment Pattern (Quick Note)

• Weightage: Continuous Assessment 50% | End Semester Examinations 50%

Source: Official Anna University – B.Tech. Textile Technology R-2025 Syllabus
Last Updated: October 2026