Lecture 2 tt 241 composotion of cotton and desizing

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 and Waxes 88 Cellulose % Constituent

Fats and Waxes ,[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]

Reactions ,[object Object],[object Object],OH-CH2 OH-CH OH-CH2 = (C17H35COO) 3 C3H5 + 3H2O Wax C17H35COOH + OHC28H57 = C17H35COOC28H57

Pectins ,[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]

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

Purpose of 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. Amylose: High molecular wt. Branched polymer Water insoluble

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

Hydrolytic desizing ,[object Object],[object Object],[object Object]

Rot steeping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Acid desizing ,[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]

Enzyme Desizing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Protein Protease Cellulose Cellulase Amylose Amylase

Types of enzymes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Application conditions 60-70 5-7 Bacterial 40-55 6.8-7 Pancreatic 55-65 4.6-5.2 Malt Temp. Deg.C pH Enzyme

Enzyme activity determination ,[object Object],[object Object],[object Object],[object Object]

Enzyme desizing process ,[object Object],[object Object],[object Object],[object Object],[object Object]

Industrial methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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

Batch process ,[object Object],[object Object]

Lecture 2 tt 241 composotion of cotton and desizing

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Lecture 2 tt 241 composotion of cotton and desizing