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Stages in Commercial Silk Production. Stage 1: Rearing silkworms on fresh leaves. Stage 2: Cocoon formation and harvesting. Stage 3: Hot air stifling of pupae. Stage 4: Soaking cocoons in boiling water. Stage 5: Reeling filaments onto spools. Stage 6: Twisting fibres into raw yarn.
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Annual Raw Silk Output by Region (thousand tonnes). 2010: East Asia 115, South Asia 22, Central Asia 4, Southeast Asia 2, Latin America 1. 2020: East Asia 140, South Asia 36, Central Asia 5, Southeast Asia 3, Latin America 1.
| East Asia | South Asia | Central Asia | Southeast Asia | Latin America | |
|---|---|---|---|---|---|
| 2010 | 115 | 22 | 4 | 2 | 1 |
| 2020 | 140 | 36 | 5 | 3 | 1 |
Standard Raw Silk Fibre Grades and Specifications. Columns: Grade, Average Denier, Tensile Strength (g/d), Elongation Rate (%). Grade 6A, 20, 4.5, 22. Grade 4A, 22, 3.8, 19. Grade 2A, 24, 3.2, 16. Grade B, 28, 2.6, 13.
| Grade | Average Denier | Tensile Strength (g/d) | Elongation Rate (%) |
|---|---|---|---|
| Grade 6A | 20 | 4.5 | 22 |
| Grade 4A | 22 | 3.8 | 19 |
| Grade 2A | 24 | 3.2 | 16 |
| Grade B | 28 | 2.6 | 13 |
Floor Plan of a Silk Cultivation Facility, north at the top. Mulberry Storage in the north-west, Rearing Hall in the north, Cocoon Sorting in the south-west, Reeling Room in the south, Yarn Packaging in the south-east.
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