Page 27 - Shawl Weaving Artisan - TT

Types of yarn faults and remedies Effect
Yarn quality is influenced by various types of yarn a Damaged fabric appearance
faults which also affects the quality of fabric produced. b Shade variation in the dyed fabrics
During the yarn manufacturing process, various types of
irregularities are generated in the yarn diameter regularly c An abnormally thick place or lump in yarn showing
or at intervals which are known as yarn faults. less twist at that place is called slubs

Yarn faults, causes, and its remedies Causes
1 Slubs a Accumulation of fly and fluff on the machine parts
An abnormally thick area or lump in yarn displaying less b Poor carding.
twist at that area. (Fig 12) c Defective ring frame drafting and bad piecing
Fig 12 d Improperly clothed top roller clearers.
Rectification

a Machine surfaces to be maintained clean.
b Proper functioning of roller clearers to be ensured.
c Broken teeth gear wheel to be avoided and proper
meshing to be ensured.
d Better fiber individualization at cards to be achieved.
3 Snarl
Effect
Yarn with kinks (twisted onto itself) due to insufficient
a More end breaks in the next process. tension after twisting. (Fig 14)
b Damaged fabric appearance.
Fig 14
c Shade variation in dyed fabrics.
Causes
a Accumulation of fly and fluff on the machine parts.
b Poor carding.
c Defective ring frame drafting and bad piecing

d Improperly clothed top roller clearers.
Rectification
a Machine surfaces to be maintained clean. Effect
b Correct functioning of roller clearers to be ensured. a Entanglement with adjacent ends causing a break
c Broken teeth wheel to be avoided and correct meshing b Damaged fabric appearance
to be ensured. c Shade variation in dyed fabrics
d Higher fiber discrimination at cards to be achieved. d Improper meshing of gear wheels
e Optimum prime roller pressure &back zone e Mixture of cottons varied wide in fiber lengths and use

f Setting at ring frame to be maintained. of immature cottons
2 Neps Causes
Yarn containing rolled fibre mass, which may be clearly a Higher than normal twist in the yarn
seen on black board at shut distance. (Fig 13) b Presence of too many long thin places in the yarn

Fig 13 Rectification
a Optimum twist to be used for the type of cotton
processed
b Drafting parameters to minimise thin places in the
yarn to be adopted

c The yarn to be conditioned
d Correct tension weights and slub catcher settings to
be employed at winding
Textile & Handloom: Shawl Weaving Artisan : (NSQF - 2024) R.T. Ex.No 1.1.06 17