Chapter 21

Chapter 21 - DRYING microwaves and radio frequency waves...

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DRYING microwaves and radio frequency waves bulky items Only material is heating – not heating machinery, so energy costs are lower 1
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PREPARATION OF FABRICS impurities removed natural fibers Require more extensive pre-treatment to remove vegetable matter lubricants, sizes, soil come out of synthetics 2
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COTTON FABRICS singeing Produces smooth surface passed over gas flame, then saturator bath to make the surface smooth desizing hot alkaline wash enzymes for starch-sized fabrics 3
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COTTON FABRICS scouring Application of sodium hydroxide removes waxes/pectin, destroys seed residue Makes seed residue swell bleaching essential for bright or pastel shades Hydrogen peroxide and sodium hydroxide 4
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COTTON FABRICS mercerization optional step immersed in sodium hydroxide under tension Slack mercerization for stretch fabrics increases strength, luster, moisture regain, dye uptake inexpensive permanent 5
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This note was uploaded on 01/19/2012 for the course HUEC 2040 taught by Professor Staff during the Fall '08 term at LSU.

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Chapter 21 - DRYING microwaves and radio frequency waves...

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