Manufacturing process of Silk

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Introduction Silk is the very fine strand of fibre that is solidified protein secretion produced by certain caterpillars to encase themselves in the form of cocoons. It is composed of a substance called bifilar containing fibroin and sericin. Silk producing countries Japan is the highest and others are India,China ,Italy,Spain,France etc.


SERICULTURE It is the cultivation of cocoons for their filament.Mulberry leaves form the basic food material for silkworms. Ideal temp: 23c-27c Humidity: 65-80% All 4 stages are important Worm ,Egg,Larva,Pupa.


Silkworm Silk egg Larva Pupa

Silkworm Rearing :

Silkworm Rearing Great care at the different stages As the larva hatches (0.4mg)and grows 10,000times its wtg in 26-28days. The worm spins the cocoon to permit development into pupa Pupa emerges as the moth Moth from the female lays egg and lifecycle continues.

Silk fiber:

Silk fiber Spinnrette:It is a small opening under the caterpillar jaws. Worm secretes a protein like substance through the spinnrette and is spun around it in form of figure 8 It has 2 strands of Fibroin stuck together Sericin . It solidifies on exposure to air. Intact cocoon is obtained by killing the pupa by a process called stoving.




FILATURE OPERATIONS Cocoons transferred to the factory Unwounded silk into skeins Sorting of cocoons on the basis of colour,shape,size and texture is done. STIFLING:The pupa turns to moth and damages the cocoon so it is killed .


SILK REELING Process of unwinding of the silk filament from the cocoons using suitable appliances. 3-10 strands are reeled together.


RE-REELING Reeled silk contain defects so re-reeling is done. WHY? Rectifies defects Raw silk is reeled to standard size silk


MANUFACTURING OF SILK YARNS Reeled silk is transformed into silk yarns-Throwing. Raw silk is soaked in warm water and then skeins are put on light reels then wound in bobbins. This thread is inspected and send for manufacturing of fabric.


EVALUATION Strength Elasticity Resilience Drapability Heat Conductivity Absorbency Cleanliness and washability Reaction to Bleaches Shrinkage

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Effect of heat and light Resistance to mildew Resistance to Insects Reaction to Alkalies ,acids Affinity for Dyes Resistance to perspiration

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