School of Textile and Design (STD)

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Browsing School of Textile and Design (STD) by Author "Abdul Qadeer"

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    Vat Discharge printing on cotton with reactive dye
    (University of Management and Technology, 2013) Muhammad Ramzan; Abdul Qadeer
    Discharge Printing is one of the recently generated printing. This print is a style of printing.Structure of discharge print is different from others printing styles. The main difference which distinguish it from others styles is the use of reducing agents. Sodium hydro sulfite was used as a reducing agent. The discharge print fabric has good textured. The faults arising in this printing style is due to the conditions which are not suitable for this. Discharge fabrics were preprocessed by different dyeing methods (i.e. exhaust and continuous) to apply discharge effects. Two different types of this style is discussed white discharge, and color discharge. There were no Cross-linking agents (binders used in pigment printing) applied before and after printing. The discharge paste is printed on to the dyed fabric and, usually during subsequent steaming; the dye in the pattern area is discharged. A white discharge is thus produced. Discharge is usually a water-based screen printing method. The majority of the ink has a water based component as its base. Water-based discharge prints can achieve the opacity of plastisol in addition to a very soft hand on dark-colored garments. It enables light, brighter colors to be obtained on a dark ground and Very sharp features like fine outlines, dots, raster etc., can be produced with total clarity, without any smudging (due to overlapping of contact colors) or outfitting problems normally faced by direct style of printing. The effect, clarity, distinction, richness and aesthetic appeal obtained add value for discharge printing. It is an expensive process with two stage application involved in dyeing or padding and discharge printing and most important results was Limited choice of ground and motif colors. Only dischargeable dyes can be discharged by this method. But in the color discharge printing we use different type of the color. When we use the vat dye color in the discharge printing that is little bit different form the white discharge in the vat discharge print cycle is print, dry, chemical pad, flash ageing, and Re- oxidation then washing.