Printing in Textiles

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  • Topic: Textile, Printing, Dye
  • Pages : 5 (1193 words )
  • Download(s) : 96
  • Published : March 31, 2013
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Printing
 
Printed textiles have designs resulting from the application of colorants in localized areas. Whether a fabric is dyed or printed can be known by examining the outline of the design. - On a printed fabric, the outline of a design is sharply defined on the outer side. The designs generally do not penetrate to the back of the cloth - However, the design may show up on the reverse side of transparently thin fabrics - Yarns raveled from printed fabric show the color unevenly positioned on them - Printing allows for great design flexibility and relatively inexpensive patterned fabric - Patterns can be achieved with printing that are not possible with any other method - Nowadays textile designer uses CAD to experiment with changes in scale and color - CAD allows designers to quickly create coordination prints for apparel and furnishing uses by selecting a portion of the original design and copying it - The dyes used for printing mostly include vat, reactive, and disperse colors which have good fastness properties - The pigments, which are not truly dyes, are also used extensively for printing - These colors are fixed to the fiber through resins that are very resistant to laundering or dry-cleaning - Pigments are among the fastness known colors and are effective for light to medium shades. If used for applying dark colors, they may crock or rub off. Improved resins, better pigments or more effective anti-crock agents must be used to solve this problem - For cotton printing vat and reactive dyes are generally used - Silk is usually printed with acid colors

- Wool is printed with acid or chrome dyes but before printing it is treated with chlorine to make it more receptive to colors - Manmade fibers are generally printed with disperse and cationic dyes  

Advantages of Printing
- Variety and complexity of designs
- Range of color combinations
- Surface dyestuffs does not saturate fabrics
- Ease of methods when compared to the woven process
- Variety of methods caters for different fabric construction  
Disadvantage of Printing
- A smooth flat surface is required
- Smudging of colors
- Color rubbing off
- Can change the handle of the fabric
 
1. PATTERN
- Printing allows for great design flexibility and relatively inexpensive patterned fabric - Patterns can be achieved with printing that are not possible with any other method - Nowadays textile designer uses CAD to experiment with changes in scale and color - CAD allows designers to quickly create coordination prints for apparel and furnishing uses by selecting a portion of the original design and copying it - Computer use increases automation of the process and decreases costs associated with labor, raw materials and inventory - Wet prints use a thick liquid paste

- Dry prints use a powder
 
Methods of Printing
Three different approaches or techniques are prevalent for printing color on a fabric: Direct, Discharge and Resist  
1. DIRECT PRINTING
- It is the most common approach to apply a color pattern directly on fabric. It can be done on white or colored fabric. If done on colored fabric, it is known as overprinting. This is a common method of printing because it is easy and economical - To prepare the print paste, a thickening agent is added to a limited amount of water and dye is dissolved in it - Earlier cornstarch was preferred as a thickening agent for cotton printing - Nowadays gums derived from seaweed are preferred because they are easier to wash out, do not themselves absorb any color and allow better penetration of color - Most pigment printing is done without thickeners as the mixing up of resins, solvents and water itself produces thickening  

1.2 Block Printing
- The designs are carved on a wooden or metal block and the paste dyestuff is applied to the design on the face of the block - The block is pressed down firmly by hand on the surface of the fabric  

1.3 Roller Printing
- In this machine counterpart of block printing, engraved...
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