Defects in Dyeing Printing and Finishing
Defects In Dyeing , Printing And Finishing
Methods of Printing
Faculty incharge :
Mr. V. Sivalingam Chairperson –fashion & textiles NIFT, BANGALORE
Submitted By:
RajshreeSoni B.F.TechV Roll No. 24 2008-12
Defects In Dyeing
Common causes of dyeing defects
• Materials not prepared properly • Poor machine conditions • Poor water quality • Short comings in dyeing solutions
1.Materials not prepared properly
• • • • • • • • Material having dead fibres or other defective fibres Left over of Chemicals after bleaching etc. Material not properly desized Material not properly mercerised. Absorbency of the fabric not proper Sticking of insoluble material on the fibres Impurities are not removed properly Uneven heat treatment.
2. Poor machine conditions
• Coming out of Dye liquor during dyeing • Defective instruments controlling temperature, pressure speed etc.
3. Poor water quality • • • • More Hardness of water Water has metal ions such as iron. PH of water not proper Water having more chlorine
4. Short comings in dyeing solutions
• Improper weight ratio of colors and chemicals. • Improper material to water ratio • Improper filtering of concentrated colors.
Common dyeing defects, their causes and remedies
• Deep selvedges: Due to difference in construction of fabric at selvedges (different weave) variation in dyeing is seen at selvedges.
• Perforation marks : In beam dyeing machine perforation marks are seen which are due to splashing of color.
Defects Deep selvedge
Causes
Remedy
Weave at selvedges are Immediate action should generally stronger than be taken into account as the textile which affects the fabric is dyed the dye penetration.
Perforation marks
In beam dyeing ,due to Uniform application of splashing of color. pressure and temperature can help in overcoming this type of defects.
• Color crocking
▫ Color in a dyed fabric which rubs off rather easily on to other fabric surface. ▫ Caused by inadequate scouring at the completion of the
Methods of Printing
Faculty incharge :
Mr. V. Sivalingam Chairperson –fashion & textiles NIFT, BANGALORE
Submitted By:
RajshreeSoni B.F.TechV Roll No. 24 2008-12
Defects In Dyeing
Common causes of dyeing defects
• Materials not prepared properly • Poor machine conditions • Poor water quality • Short comings in dyeing solutions
1.Materials not prepared properly
• • • • • • • • Material having dead fibres or other defective fibres Left over of Chemicals after bleaching etc. Material not properly desized Material not properly mercerised. Absorbency of the fabric not proper Sticking of insoluble material on the fibres Impurities are not removed properly Uneven heat treatment.
2. Poor machine conditions
• Coming out of Dye liquor during dyeing • Defective instruments controlling temperature, pressure speed etc.
3. Poor water quality • • • • More Hardness of water Water has metal ions such as iron. PH of water not proper Water having more chlorine
4. Short comings in dyeing solutions
• Improper weight ratio of colors and chemicals. • Improper material to water ratio • Improper filtering of concentrated colors.
Common dyeing defects, their causes and remedies
• Deep selvedges: Due to difference in construction of fabric at selvedges (different weave) variation in dyeing is seen at selvedges.
• Perforation marks : In beam dyeing machine perforation marks are seen which are due to splashing of color.
Defects Deep selvedge
Causes
Remedy
Weave at selvedges are Immediate action should generally stronger than be taken into account as the textile which affects the fabric is dyed the dye penetration.
Perforation marks
In beam dyeing ,due to Uniform application of splashing of color. pressure and temperature can help in overcoming this type of defects.
• Color crocking
▫ Color in a dyed fabric which rubs off rather easily on to other fabric surface. ▫ Caused by inadequate scouring at the completion of the