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British manufacturing industries Volume 5

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    Available in PDF - DJVU Format | British manufacturing industries Volume 5.pdf | Language: ENGLISH
    G. Phillips Bevan (Author)

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876 Excerpt: ...13. Wincing in a solution of bleaching powder. 14. Washing at the dash-wheel. 15. Drying by the water-extractor. 16. Folding. 17. Starching. 18. Drying by steam. The cloth is then ready for finishing and making up. The above list of processes is applicable to dyeing red in madder, though somewhat varied, according to the tint that is to be printed. In the 'ageing room ' the mordant, by exposure to the air, undergoes a chemical change, by which it becomes attached to the cloth in an insoluble state. The process of ' dunging ' is next employed, its object being to remove the superfluous mordant or colouring matter, which would otherwise spread ovor the surface of the cloth and deface tho pattern. This is attained by passing the cloth through a weak solution of cow-dung, contained in two stone cisterns placed end to end, each about 6 feet long, 3 feet wide, and 4 feet deep. The mixture in one cistern is formed with 2 gallons of dung to the cistern full of water, heated to about 160 to 180. Tho second cistern contains nearly 1 gallon of dung. The cloth, guided by rollers to keep it free from folds, is drawn quickly through the first cistern and then through the second. The process is necessary for alum, iron, and tin mordants, when applied to the cloth before the dye. The dye is contained in a vat, through which the cloth is drawn on rollers for two hours and a quarter. The colour attaches itself firmly to those portions of the cloth on which the mordant has previously impressed, forming with the latter a chemical compound. The subsequent wincings in soap and water and in bleaching-powder remove the colouring matter, which feebly adheres to the unmordanted portions of the cloth. The above plan of dyeing must be considerably varied in case of...
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Book details

  • PDF | 50 pages
  • G. Phillips Bevan (Author)
  • RareBooksClub.com (19 May 2012)
  • English
  • 8
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