Cotton Roll #1

8/8/2019 Cotton Roll #1

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1) Cultivating & HarvestingCotton is grown anywherewith long, hot dry summerswith plenty of sunshine andlow humidity.T he cotton bolls areharvested by stripper harvesters and spindle

pickers, that remove theentire boll from the plant.


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2) Preparatory ProcessesT he process involved in the conversion of rawcotton into yarn is described as follows:


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3) SpinningT he spinning machines take the roving, thins it andtwists it, creating yarn which it winds onto a bobbin.

Several slivers are drawn and twisted together toform the final yarn. T wisting is made by twomechanical actions. First, a drawing framecondenses slivers into a thinner strand (slubbing) andwinds it on a bobbin. A spinning frame then reducesroving to required size of single yarn (fine spinning).A suitable amount of twist is introduced according tothe intended use of the fibre.


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5) Fi n ishi ng Pr oce ssesAmmoniatingBeetling

CalendaringM ercerizingSingeing (Sanforising)

DesizingScouringGlazing


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GassingBleaching

DyeingPrinting

T here are a few more finishing processes such aswrinkle resistance finishing, flame retardantfinishing, soil repellency finishes etc. which can also

be carried out to enhance the properties of the fabricfurther.


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4) WeavingMachines called loomsweave cotton yarns intofabrics. Looms interlace the

length-wise yarns (warp)and the crosswise yarns(wefts). The woven fabric,called gray goods, is sentto a finishing plant where

the fabric is treated withvarious type of chemicalfinishes and undergoes avariety of physicalproperty enhancement

processes.


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EVALUATIN G CO TT O N F ABRI CS StrengthElasticity

ResilienceDrapabilityHeat Conductivity

AbsorbencyCleanabilityResistance to alkalies and acids


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U ses


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U ses ContinuedApparel, home furnishings, and other industrialuses (such as medical supplies).

Finishing processes that have been applied to thecotton fibre, cotton is made into specialtymaterials suitable for a great variety of uses.


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Important DevelopementsGenetically M odified Cotton(G M CO TT ON)-

A gene conferring resistance to glyphosate (an

active ingredient in herbicides) was transformedinto cotton for the first time in 1987.Bt cotton is a pest- (rather than pesticide-)resistant variety. It contains a foreign geneobtained from bacillus thuringiensisa , which

protects the plants from boll worm


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Fibre Identification T estFeeling T estBurning T est

Approaching flame: ScorchesIn flame: Burns quickly; yellow flameRemoved from flame: continues to burn rapidly;has a afterglowOdour: Burning paper.Ash: Light feathery grayish; black ash denotesmercerized cotton.


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M icroscopic T estChemical T esta) Stain T echnique Double Barred Fibre

Identification b) Solvent T echnique


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Statistics


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Statistics Continued


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THANK YOU

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Cotton Roll #1