The document discusses common defects that can occur during the dyeing process, including barre, bleeding, crocking, off shade, shade bar, shading, stained, and streaked. It lists several potential causes of dyeing defects, such as improperly prepared materials, impurities not being fully removed, issues with water quality or dye solution preparation, and shortcomings in dyeing machinery. Common defects include horizontal bands or variations in color tone caused by uneven tensions or changes during the dyeing process. Defects can also be caused by stains or residues on fabrics prior to dyeing.
Beam dyeing is simply a much larger version of package dyeing.
This method is similar to package dyeing but is more economical.Yarn is wound on to a perforated warp beam or perforated cylinders
Beam dyeing is simply a much larger version of package dyeing.
This method is similar to package dyeing but is more economical.Yarn is wound on to a perforated warp beam or perforated cylinders
Dyeing fault causes and remedies
Dyeing Fault:
Uneven dyeing:
Causes
•Due to improper pretreatment.
• Very rapid addition of dyes and chemicals.
• Lack of controlling dyeing parameters
Remedies
•Check addition of dyes and chemicals are at a steadily
increasing rate.
•Proper pretreatments.
•Check the rope turnover time.
•Proper washing after dyeing.
Running shade:
Causes
•Machine loading is higher.
•Running at lower nozzle pressure.
•High bath draining temperature.
Remedies
•Proper cycle time should be ensured.
•Nozzle pressure should be accurate.
•Bath draining temperature should be moderate.
Flocking is defined as the application of fine particles to adhesive coated surfaces. Nowadays, this is usually done by the application of a high-voltage electric field. In a flocking machine the "flock" is given a negative charge whilst the substrate is earthed. Flock material flies vertically onto the substrate attaching to previously applied glue.
Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with desired color fastness. Dyeing is normally done in a special solution containing dyes and particular chemical material. … In dyeing, it is applied to the entire textile.
Dyeing fault causes and remedies
Dyeing Fault:
Uneven dyeing:
Causes
•Due to improper pretreatment.
• Very rapid addition of dyes and chemicals.
• Lack of controlling dyeing parameters
Remedies
•Check addition of dyes and chemicals are at a steadily
increasing rate.
•Proper pretreatments.
•Check the rope turnover time.
•Proper washing after dyeing.
Running shade:
Causes
•Machine loading is higher.
•Running at lower nozzle pressure.
•High bath draining temperature.
Remedies
•Proper cycle time should be ensured.
•Nozzle pressure should be accurate.
•Bath draining temperature should be moderate.
Flocking is defined as the application of fine particles to adhesive coated surfaces. Nowadays, this is usually done by the application of a high-voltage electric field. In a flocking machine the "flock" is given a negative charge whilst the substrate is earthed. Flock material flies vertically onto the substrate attaching to previously applied glue.
Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with desired color fastness. Dyeing is normally done in a special solution containing dyes and particular chemical material. … In dyeing, it is applied to the entire textile.
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This ppt will take you through various defects’ causes and remedies due to dyeing & printing defects. Check out the full article on https://goo.gl/HB6lxn
1.Wireless Communication System_Wireless communication is a broad term that i...JeyaPerumal1
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Features of Wireless Communication
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The transmitted distance can be anywhere between a few meters (for example, a television's remote control) and thousands of kilometers (for example, radio communication).
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https://bit.ly/3KACoyV
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2. Causes Of Dyeing Defects
1. The material is not well prepared for dyeing and printing
a. Material having dead fibres or other defective fibres
b. Left over of Chemicals after bleaching etc.
c. Material not properly desized
d. Material not properly mercerized.
e. Absorbency of the fabric not proper
f. Sticking of insoluble material on the fibres
g. Impurities are not removed properly
h. Uneven heat treatment.
2.Water Quality not Proper
a. More Hardness of water
b. Water has metal ions such as iron.
c. pH of water not proper
d. Water having more chlorine
3. 3. Due to Shortcomings in making Dyeing Solution
a. Improper weight ratio of colors, material and chemicals.
b. Improper material to water ratio
c. Improper filtering of concentrated colors.
4. Due to Shortcomings in the dye machinery
a. Coming out of Dye liquor during dyeing
b. Defective instruments controlling temperature, pressure speed etc
4. Barre
• Its horizontal shaded band across the width
of the fabric
• It may be caused by variation in the size of the
filling yarn and by the differences in tension of
either the filling or warp yarns.
5. Bleeding
• It’s a loss of color when the
dyed fabric is wetted or
emerged in water.
• The water here, becomes
colored and may cause
discoloration of other fabrics.
• This is usually due to either
improper dye selection or poor
dye fastness.
6. Crocking
• It is the rubbing off
of the color.
• It may rub onto
another fabric.
• This may be due to
inadequate scoring
subsequent to
dyeing.
7. Off Shade
• It refers to color that doesn't exactly match
the standard or the prepared sample.
• This may be due to faulty dye foundation or
application or may be due to variation in dye
lot.
8. Shade Bar
• It is a horizontal band of
a different hue running
across the fabric.
• It may be caused by a
change of filling bobbin
in the loom or a loom
stop and start up
9. Shading
• It is a variation in color
tone either
horizontally or
vertically.
• It is generally due to
uneven tension on the
fabric.
10. Stained
• It indicates a
discoloration caused
by a foreign substance,
dirt, grease, oil or
sizing residue on the
fabric being dyed.
11. Streaked
• This type of defect on the fabric indicates
either a stain or uneven dyeing caused by
folds in the fabric during the dyed process.
