Subject Code & Name: TT25C06 – Technology of Weaving 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
- This course introduces students to provide fundamental understanding of weaving principles, loom mechanisms and yarn preparation for shuttle and shuttle less loom.
- The course equips students with practical knowledge of modern shedding, weft insertion, secondary motions and process control, with emphasis on fabric quality, loom efficiency, and special weaving techniques for conventional and auto looms.
Full Unit-wise Syllabus
Unit I – Introduction to Weaving
Classification of looms; warp and weft preparation for high speed looms; yarn quality requirements for high speed automatic shuttle looms and shuttle less looms; principle of weaving, passage of material in a plain power loom; Objectives of primary, secondary and auxiliary motions; driving in a plain power loom; timing of motions.
Activities: Images of components of shuttle looms
Unit II – Shedding Mechanisms
Shed geometry and shedding requirement; types of shed; shedding mechanisms – objectives and working of negative and positive tappet shedding mechanisms, dobby & jacquard shedding mechanism, electronic dobby & jacquard shedding mechanisms; depth of shed – altering depth of shed; heald reversing mechanisms-limitations of various shedding mechanisms
Practical: 1. Determination of depth of shed and heald shaft movements in tappet shedding mechanism 2. Study of dobby shedding mechanisms 3. Preparation of pattern cards for dobby shedding mechanism and adjust the depth of shed 4. Study of jacquard shedding mechanisms
Activities: Develop models for various types of shedding mechanism, cam profiles for various weaves, sketching the mechanisms of dobby and jacquard
Unit III – Picking and Beat Up Mechanism
Picking – objectives and working of over pick and under pick mechanisms in plain power loom; shuttle checking devices, shuttle flight and timing; principles and mechanisms of weft insertions by rigid and flexible rapier, projectile, air jet and water jet shuttle less looms; selvedges in shuttle less looms – types and principles of formation; multi-phase weaving; objectives and working of crank- crank arm and cam beat up mechanisms; sley eccentricity – definition and eccentricity for different widths of looms .
Practical: 1. Study of picking mechanisms in looms 2. Study of beat-up mechanisms in looms 3. Determination of sley eccentricity in shuttle loom
Activities: Drives for picking and beat up mechanism, Energy calculations, Yarn requirements
Unit IV – Secondary Motions
Take – up motions – objectives and working of 7 wheel, worm & worm wheel take-up motions – determination of pick space; let – off motions – objectives and working of negative, semi-positive and positive type let-off motions; oscillating back rest – objectives and working;
Practical: 1. Study of let-off mechanisms 2. Study of take-up mechanisms 3. Determination of pick space through various take-up mechanism
Activities: Secondary motions in modern looms
Unit V – Auxiliary Motions
Functions and working of weft feeler, weft replenishment mechanisms, three try motion, weft accumulators, shuttle protector, weft cutter and self threading shuttle; warp protector mechanisms – objectives and working of loose reed and fast reed types; warp stop motion – objectives, drop wires, working of mechanical and electrical type warp stop motions; Weft stop motion – objectives and working of side weft fork & centre weft fork motions; quick style change; temples – objectives and functions of different types of temples; brake – objectives and working ;
Practical: 1. Study of warp protector motions 2. Study of warp and weft stop motions 3. Study of weft replenishment mechanism in pirn changing automatic loom 4. Study of temples and brake
Activities: Drive arrangement for auxiliary motions, auxiliary motions in modern looms
Unit VI – Drop box and Terry looms
Drop box looms – objectives and working of 2x1 and 4x1 drop box changing mechanisms; card saving device – pattern cards preparation for producing different coloured weft patterns; pick-at-will motion- principle; terry looms - 3 pick terry structure – working of terry motion;
Practical: 1. Study of drop box motion 2. Preparation of pattern cards for producing weft colour patterns in 4 X 1 drop box motion 3. Study of terry mechanism
Activities: Prepare a pattern card for controlling drop box mechanism.
Unit VII – Process Control in weaving
Techno economics of shuttle less loom weft insertion systems; loom monitoring and control; loom stoppages and efficiency; fabric defects – causes, remedies and value loss; fabric shrinkage in loom – causes and control; synthetic weaving - modifications to be made for the preparation of warp and weft yarns - changes to be made in looms for weaving synthetic fabrics; safety measures in loom shed
Practical: Understanding of the loom requirements from the given sample
Activities: Images of various fabric defects, production plan, maintenance schedule for weaving machines
Course Outcomes (COs)
- CO1: Understand advanced weaving technologies, loom mechanisms, and preparatory processes involved in fabric production.
- CO2: Apply weaving principles and loom operational parameters to achieve required fabric quality and production efficiency.
- CO3: Analyze the performance of different weaving systems, looms, and process parameters in relation to productivity, fabric quality, and manufacturing efficiency.
- CO4: Evaluate and select suitable weaving technologies, loom configurations, and process parameters for manufacturing fabrics with specified performance and quality 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
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