WOOL

Prepared By,

ROKIBMS(ACCE,RU)MBA(Operations Management, EWU)

Sr.OfficerQTEC DHAKA LAB

WOOL Wool is a natural protein fiber. This fiber obtained from the

fleece of the sheep/lamb or hair of the Angora or Cashmere goat or camel or alpaca.

Composed of amino acids by peptide bonds.

SHEEP

ANGORAALPACA

CASMERE GOAT

CAMEL

Special Property of Wool

Color to Kayastain(Q): Blue Burning Properties:

Burns with crimping and shrimping. Smell is very similar to burning hair. Black swelling ash. Ash is not very hard but not as soft as cotton.

Moisture Regain: 15% Solubility: 5%NaOH, 5%NaOCl Microscopic Structure:

Irregular, roughly scale, similar to fish scales. Three layers: Epidermis (outer ), cortex

(middle), and medulla (inner)(in coarse wool).

General Properties of Wool Composed of amino acids. Excellent absorbency property, moisture regain

is high. Warmer than other fibers. Good resistance to acids. Wool is very sensitive to alkali. Requires frequent dry cleaning. Weakest of all natural fiber. Nonconducter of heat. High shrinkage. Burn slowly.

WOOLAdvantages Disadvantages

Warm . Lightweight. Dyes well. Comfortable. Durable. Creases well. Recyclable .

Affected by moths High sringkage. Needs special care, dry

cleaning . Scratchy on skin . Harmed by

chlorinated bleach.

Classification of Wool

Classification by Sheep Merino Wool: 

Strong, Greatest amount of crimp and has maximum number of scales.

Class – Two Wool: Strong, large number of scales per inch and have good crimp.

Class – Three Wool: Fewer scales and less crimp, smoother, and more lustrous.

Class – Four Wool:  Hair like, and have relatively few scales and little crimp. Mainly used for carpets, and inexpensive low-grade clothing.

Merino Class Two Class Three Class Four

Classification of WoolClassification by Fleece: Lamb’s Wool:

The fleece obtained by shearing the lamb of six to eight months old for the first time. Hogget Wool: 

Obtained from sheep about 12 to 14 months old that have not been previously shorn. Wether Wool:

These fleeces are obtained after the first shearing. These fleeces contain much soil and dirt.

Pulled Wool: The wool is pulled from the pelt of the slaughtered sheep using various chemicals. The fibers of pulled wool are of low quality and produce a low-grade cloth.

Dead Wool: This is the wool obtained from the sheep that have died of age or accidentally killed. Dead wool fiber is decidedly inferior in grade; it is used in low-grade cloth.

Cotty Wool: Obtained from the sheep that are exposed to severe weather. The cotty wool is of a poor grade and is hard and brittle.

Tag locks:  The torn, ragged, or discolored parts of a fleece are known as tag locks. These are usually sold separately as an inferior grade of wool.

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