Manufacturing process of Silk

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By: linyue (28 month(s) ago)

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Introduction:

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:

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.

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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.

SPINNERETTE :

SPINNERETTE

FILATURE OPERATIONS:

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:

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

RE-REELING:

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:

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:

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

Slide 12:

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