Printing in textiles
When Alexander invaded India in BC, there were reportedly block-printed textiles produced there.
This latter is effected by rubbing off, upon its flat surface, a tracing in lampblack and oil, of the outlines of the masses of the design.
Similar molds are also made by burning out the lines of the pattern with a red-hot steel punch, capable of being raised or lowered at will, and under which the block is moved about by hand along the lines of the pattern. Ancient world[ edit ] As in, the case of weaving and embroideries, specimens of printed stuffs have of recent years been obtained from disused cemeteries in Upper Egypt Akhmim and elsewhere and tell us of Egypto-Roman use of such things.
A design is drawn on, or transferred to, prepared wooden blocks.
Further information: Perrotine printing The perrotine is a block-printing machine invented by Perrot of Rouen in and is now only of historical interest. He does not explain how this saturation is done.
Textile printing ppt
Similar molds are also made by burning out the lines of the pattern with a red-hot steel punch, capable of being raised or lowered at will, and under which the block is moved about by hand along the lines of the pattern. Tufted carpets are printed by a process designed to ensure good penetration. Flat-screen printing is done in a similar way but machines operate each stage and often the pattern is applied to the screen digitally. It is precise, so each portion of an elaborate multicolour pattern can be fitted into its proper place without faulty joints at the points of repetition. A blade squeegee squeezes the printing paste through openings in the screen onto the fabric. Another thing is that solid colours are best printed with screen printing, so no photograph printing etc where you have many variations and gradations of colours. Roller printing This technique is used whenever long runs of fabric are to be printed with the same design. The first written reference to printed textiles in Europe is found in Florentine trade regulations from the fifteenth century. Woman doing block printing at Halasur village, Karnataka , India. The second impression is made in the same way, the printer taking care to see that it registers exactly with the first. Two types exist: rotary screen printing and flat bed screen printing. For conventional methods the thickeners are such reagents as starch , gum tragacanth, alginates, methyl cellulose ethers , and sodium carboxymethyl cellulose. For discharge printing , the cloth is first dyed with a background colour, which is destroyed by reagents, or reducing agents, carried in a print paste. The printed fabric passes from the main cylinder and through a drying and steaming chamber to fix the colour. Inkjet technology in digital textile printing allows for single pieces, mid-run production and even long-run alternatives to screen printed fabric.
The paper is then applied to the fabric by passing the two together through a type of hot calender, and the pattern is transferred from one to the other. Some machines use other methods for gripping the fabric.
This limitation influences the design. This method involves a sublimation dye which is transferred to the fabric with heat. The patterns are created through removal, rather than addition, of color, hence most discharge printing is done on dark backgrounds.
Printing is carried out after pre-treatment of fabric or after dyeing of the fabric.
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