GB/T 45294-2025 in English
VALIDCode of practice for silk quality evaluation of silkworm cocoons
- Issued on:2025-02-28
- Implemented on:2025-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
| Standard No: | GB/T 45294-2025 |
| Document status: | VALID |
| Title in English: | Code of practice for silk quality evaluation of silkworm cocoons |
| Title in Chinese: | 桑蚕茧蚕丝品质评定技术规程 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2025-02-28 |
| Implemented on: | 2025-09-01 |
| ICS Classification: | 65.020-Farming and forestry |
| Chinese Classification: | B47-Beekeeping, silkworm keeping |
| Professional Classification: | GB-National Standard |
| Related Keywords: | silkworm cocoons introduction analysis
spring cocoons autumn cocoons silk quality evaluation relaxation rate cocoon cooking uniformity |
| Related Topics: | quality
silk wild silkworm silkworm Mulberry silk products |
《GB/T 45294-2025桑蚕茧蚕丝品质评定技术规程》由TC437（全国桑蚕业标准化技术委员会）归口，主管部门为农业农村部。
Introduction
Analysis of the core content of the standard
| Inspection items | Key technical indicators | Testing methods | Equipment requirements |
|---|---|---|---|
| Relaxation test | Reeling speed(96±3.2)m/min, soup temperature(36±2)℃ | Fixed grain size of 8, 50 grains for 3 threads | Vertical reeling machine (stable and adjustable speed) |
| Cleanliness test | Blackboard winding scoring, fineness 21-26dtex | GB/T 1798 scoring method | Repetitive shaking machine (circumference 1.5±0.005m) |
| Cocoon cooking process | High temperature penetration (98.5±1.5)℃, low temperature water absorption (60±5)℃ | Partitioned cocoon cooking for 1-1.5 minutes | Permeabilizer, water absorption tank |
Key points of technological evolution and innovation
This standard is the first to include Pupae rate control is included in the specification (2.4%-2.8% for spring cocoons, 2.8%-3.2% for summer and autumn cocoons), and the inspection standardization is achieved through the equal grain and equal amount partition method. Compared with GB/T 9111-2008, a special operation process for 20-grain clean inspection is added to improve the accuracy of small sample inspection.
Implementing key control points
- Sample cocoon drying: Strictly implement the moisture content standard of GB/T 15268 to avoid over-drying affecting the relaxation rate
- Cocoon cooking uniformity: Ensure the moderate expansion of the cocoon layer through the combined process of high temperature penetration (<1min) + low temperature water absorption (10-15min)
- Silk reeling grain setting: Adopt the "add first and then pinch" operation method, and the error is controlled within the range of ±0.5 grains
Solutions to common problems
Case 1: Abnormal fluctuation of relaxation rate
An enterprise found that the relaxation rate was 5% lower than the standard value during inspection. After investigation, it was found that the temperature of the cocoon boiling barrel soup exceeded the range of (40±3)℃. After adjustment, the data was restored to the normal range by adding a temperature automatic control system.
Case 2: Cleanliness score deviation
There was a 1.5-point difference in the inter-laboratory comparison, which was traced back to the inconsistent winding tension of the blackboard. After the re-shaking machine was equipped with a breakage automatic stop device as standard, the score repeatability increased by 30%.
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