Style of Printing in textile wet proccessing

Textile of printing by tecn texbot

Style of printing,Types of resist style ,others

In printing style means the manner in which a printed effect is produced as distinct form the method which involves the means (like a block or screen) by which the pattern is produced. Style of printing involves certain mechanical operations and chemical reaction

Style of printing by Tecn texbot
Style of Printing in textile wet proccessing 6

Styles of printing are:

  1. Direct style: This style is also referred as “steam style” because in most of the case the printed fabric is steamed to fix the color. The color is applied directly to the fabric with the required ingredients and after printing and drying the color is fixed by steam or thermo fixing. (Drying and fixing is done be steam or thermo fixing). Thus a multicolored print on a white ground can be produced as unprinted portion is white
  2. Dyed Style: Dyed style differs from the direct style. In this method the color and the mordant are applied separately in two stages, known as mordanting and dyeing. The style is produced in three steps:
    1. Mordanting: Mordant is first applied on the cloth by printing, then the fabric is dried and fixed with a fixing agent, then washed well to remove excess fixing agent.
    1. Dyeing: Finally, the fabric is dyed till the required depth of shed is obtained. During this operation the dyestuff is combined with the mordant to form an insoluble lake. But the color unmordanted portions only adheres mechanically.
    1. Washing: Washing and soaping of dyed fabric is done to remove all loosely adhering color and to clear the unmounted (white) parts of the pattern.
  • Discharge style: Discharge style of printing can be two types.
  • White discharge printing
  • Colored discharge printing

In white discharge printing, the fabric is dyed then printed with a paste containing a chemical the reduced the dye and hence removes the color where white design are desired.

Style of Printing in textile wet proccessing
Style of Printing in textile wet proccessing 7
  • Resist Style: Resist style of printing is carried out in two steps:
  1. Printing: The fabric is printed with resist salt solution which is sprayed on the fabric mechanically or manually.
    1. Dyeing: The fabric is dyed with a suitable dye as a result the areas covered by the resist salt will not be dyed and other portion will be dyed.
Style of Printing in textile wet proccessing
Style of Printing in textile wet proccessing 8

Types of resist style:

  1. White resist: No color is added to the print paste solution with resist salt. After dyeing the printed area remains white.
  2. Color resist: Coloring material is added to print paste with resist salt. The printed area contains the color added to the print paste and the remaining area will contain the color of dye solution.
  1. Azoic style: It consists of two steps:
  1. Naphthalation: Naphthols are insoluble in water and they are converted into water soluble compound by treating with alkali. The process of dissolving naphthol is called naphthalation.
  2. Diazotisation: It involves converting the base into soluble diazonium salt. A base containing amino group (-NH2) to form a solution of diazonium chloride of that base in presence of excess HCl at 0-50 C temperature.
  3. Coupling: When naphthol react with diazonium salt, a diazo radical produce. The reaction is called coupling reaction.

In azoic style, fabric is treated in two steps:

  1. Printing: The fabric is printed with naphthol solution.
    1. Padding; The fabric is treated in a bath containing diazonium salt to carry out coupling reaction and thus color is produced inside the fabric itself.

2.    Others:

  1. Raised style: The term “Raised” signifies that the color is made visible on fabric by wet treatment. When a colorless lead salt is printed on white fabric and then passed through a

solution of potassium dichromate a yellow color of lead chromate develops on the fabric.

Style of Printing in textile wet proccessing2Pb(CH3COO)2 + K2Cr2O7 + H2O      =       2PbCrO2 +2CH3COOK+ 2CH3COOH

Lead acetate                                                      Lead chromate

  • Metal style: Some spangle type metals are printed on the fabric in this type.
  • Crepon/ Crimp/Crepe style: In this style, printing is performed after alkali or heat setting. In this type, the object is to shrink the goods at some parts giving a sort or shriveled or crimped appearance to the treated area.

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