Lecture 2 preparatory processes

PREPARATORY PROCESSES FOR COTTON R.B.CHAVAN Department of Textile Technology Indian Institute of Technology Hauz-Khas, New Delhi 110016 E-mail rbchavan@hotmail.com

Composition of cotton ,[object Object],8.0 Moisture 1.0 Mineral Matter 0.5 Colouring matter 1.1 Proteins 0.7 Pectins 0.5 Oils, Fats and Waxes 88 Cellulose % Constituent

Fats and Waxes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pectins ,[object Object],[object Object],[object Object],Some COOH groups are present as Ca and Mg salts Free acid and Ca and Mg salts are insoluble in water

Proteins ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Colouring matter ,[object Object],[object Object],[object Object]

Mineral Matter ,[object Object],[object Object],5.0 Aluminium oxide 3.0 Ferric oxide 8.4 Magnesium sulphate 10.3 Calcium carbonte 9.0 Calcium sulphate 9.3 Potassium sulphate 9.9 Potassium chloride 44.8 Potassium carbonate

Added Impurities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PREPARATORY PROCESSES ,[object Object],[object Object],[object Object],[object Object]

Principle of preparatory processes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Desizing ,[object Object],[object Object],[object Object],[object Object],Chemically it is Amylose: Linear polymer of low mol. Wt. Amylopectin: High molecular wt. Branched polymer Water insoluble

Desizing methods ,[object Object],[object Object]

Ref: http://www3.itv-denkendorf.de/itv2/downloads/d0003602/WG3BarcPosner.pdf

SCOURING TREATMENT OF COTTON WITH ALKALINE SOLUTION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

INDUSTRIAL PRACTICES EQUIPMENT USED ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Kier(Rope Form) Winch (Rope Form) Jet machine (Rope form) Jigger (Open width form)

Continuous Processing J-Box (Rope Form) Continuous (Open width) Saturator, Steamer, Washer.

Semi-Continuous Pad-Batch (Open Width form)

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ENVIRONMENTAL ISSUES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lecture 2 preparatory processes

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Lecture 2 preparatory processes