SylbV01-00-00. pmd

VI. Theory
BLOCK 1: Cocoon as raw material
Unit 1:
Physical characteristics
Introduction; Importance and use of silk, cocoon quality. Physical
characteristics- cocoon colour, shape, size, wrinkles, uniformity and
compactness.
Unit 2:
Commercial characteristics
Cocoon weight, shell weight, shell percentage, filament length, denier,
non-breakable filament length, reelability and raw silk percentage.
BLOCK 2:
Transaction of cocoons
Unit 1:
Defective cocoons
Types of defective cocoons, reasons for defective cocoons, cocoon sorting,
methods of sorting, estimation of defective cocoons per kg. Technological
aspects. Selection of raw material for silk reeling – scientific method
of testing and classification of cocoons.
Unit 2:
Cocoon marketing
Marketing based on visual observation and based on quantitative

---

Restructured and Revised Syllabi of Post-graduate Programmes
Vol. 1
746
parameters, open auction system (Quality based pricing) and E-
transaction. Limitations of open auction system and estimation of
renditta.
BLOCK 3: Steps in silk reeling
Unit 1:
Cocoon stifling
Definition, different methods of stifling of cocoons - sun drying, steam
stifling, hot air drying (shelf carrier type, Tunnel type, Band type- hot
air circulating, air heating type and one step band type) and other
methods. Effect of storage on stifling. Moisture percentage, Phenomenon
of cocoon drying, drying percentage, equilibrium moisture percentage
(Phenomenon of moisture evaporation). Effect of cocoon thickness and
compactness on cocoon stifling, advanced system of cocoon stifling and
machineries.
Unit 2: