Softener not properly dissolved in water.It indicates a discoloration caused by a foreign substance, dirt, grease, oil or sizing residue on the fabric being dyed. Stain defect occurs in the fabric when there are discolored spots in the fabric. It is generally due to uneven tension on the fabric.It is a variation in color tone either horizontally or vertically.Shade variation defect occurs in the fabric when there is a difference in color of the fabric. High temperature, pre-dissolution of chemicals, slippage of goods, longer yardage for vat dyeing on jigger, selvedge remaining exposed for paf batch dyed goods and uneven fabric widths are the main reasons for bad selvedge. It may be caused by a change of filling bobbin in the loom or a loom stop and start up.It is a horizontal band of a different hue running across the fabric.Shade bar defect occurs in the fabric when there is a horizontal band of a different hue of the color running across the width of the fabric.Selecting proper leveling agent for the process.Improper scouring and bleaching, uneven surface of padding rollers, and folds while padding is the reasons for patchy dyeing apart from improper dissolution of dyestuffs. This may be due to inadequate scoring subsequent to dyeing.Select appropriate dyeing conditions and chemical mix.Irregular winding leading to channeling.The causes for this type of defect can be as follows: Uneven dyeing defect occurs in the fabric when there is difference in the shade of the fabric through the width of the fabric. This is usually due to either improper dye selection or poor dye fastness.The water here, becomes colored and may cause discoloration of other fabrics.It’s a loss of color when the dyed fabric is wetted or emerged in water.Properly relaxing the material before dyeing may be the remedies of this defect.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.Its horizontal shaded band across the width of the fabric.Common dyeing defects are point out below:Ī short description of above dyeing defects are given below:īarre defect occurs in the fabric when off shaded yarns run from selvedge to selvedge after dyeing. List of Dyeing Defects in Fabrics and Textiles:ĭuring dyeing a number of defects occur. The fabric was not prepared properly before dyeing The dyeing procedure did not take place properlyį. Defective instruments controlling temperature, pressure speed etc.Į.Due to Shortcomings in the dye machinery: Improper filtering of concentrated colors.ĭ.Improper weight ratio of colors, material and chemicals.Sticking of insoluble material on the fibers.Left over of Chemicals after bleaching etc.Material having dead fibers or other defective fibers.The minor defects can be untrimmed thread-ends, slight dirt in a non-noticeable zone which can be removed, etc.ĭyeing defects may occur due to many reasons such as the following: (A “second” is a garment with a conspicuous defect that affects the salability or serviceability of the item).Ī defect is defined as minor defect that is not likely to reduce the usability of the product, but nevertheless may negatively influence the sales. Fig: Dyeing defectsĭyeing defects are classified into two main categories:Ī defect that, if conspicuous on the finished product, would cause the item to be a second. Dyeing process needs very vigilant control on the dyeing conditions, like the temperature, time, color concentration and ratios, chemicals used, and the material to liquor ratio, to ensure even shade in the batch. It is important that the general precautions should be followed while dyeing a textile material. There are a number of problems of the reproducibility and difficulties in obtaining right-first-time dyeing. Defects that occur in the fabric during the dyeing process are called dyeing defects.
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