Southeast University Prepared By : Mazadul Hasan sheshir ID: 2010000400008 13 th Batch (session 2009-2013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com Blog : www. Textilelab.blogspot.com (visit) Southeast University Department Of Textile Engineering I/A 251,252 Tejgaon Dhaka Bangladesh Prepared By : Faults in Dyeing Sector Faults in Dyeing Sector Yarn Dyeing Faults 1. Package un-level 2. Package to package shade variation 3. Color spot 4. Ring mark 5. Dirt mark Yarn Dyein g Fault 1. Package Unlevel Causes: a. Tension variation while soft winding of the package b. Lot mixing of yarns in the same package c. Different counts of yarns in the same package d. Pressure variation in the machine vessel e. Improper pretreatment of the yarn f. Improper quality of the dyes and chemicals g. Improper acid treatment after scouring and bleaching 2. Package to Package shade variation Causes: a. Improper setting of yarn packages in the machine b. Lot mixing of the packages c. Count variation of packages Causes: a. Improper setting of yarn packages in the machine b. Lot mixing of the packages c. Count variation of packages Packag e Unlevel 3. Color Spot Causes: a. Floating of dye particles in the air b. Improper per-oxide killing c. Hardness of water d. Improper mixing of dyestuffs Packag e Unlevel P 2 P shade variatio n 5. Ring Mark Causes: a. Improper drying of the packages b. Improper peroxide killing 4. Dirt Mark Causes: a. Dirty handling of the packages b. Presence of dust in the air Figure: Dirt mark Packag e Unlevel P 2 P shade variatio n Colo r Spot . Prepared By : Faults in Dyeing Sector Faults in Dyeing Sector Yarn Dyeing Faults 1. Package un-level 2. Package to package shade variation 3. Color spot 4. Ring mark 5. Dirt mark Yarn Dyein g. b. Lot mixing of yarns in the same package c. Different counts of yarns in the same package d. Pressure variation in the machine vessel e. Improper pretreatment of the yarn f. Improper. variation Causes: a. Improper setting of yarn packages in the machine b. Lot mixing of the packages c. Count variation of packages Causes: a. Improper setting of yarn packages in the machine b. Lot