GB/T 9774-2020 in English
VALIDSacks for packing cement
- Issued on:2020-09-29
- Implemented on:2022-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 9774-2020水泥包装袋》由TC49（全国包装标准化技术委员会）归口，TC49SC2（全国包装标准化技术委员会袋分会）执行，主管部门为国家标准化管理委员会。
Introduction
Core changes in the standard revision
| Technical elements | Requirements of the 2010 version | Changes in the 2020 version |
|---|---|---|
| Bag type classification | Bags with seam bottom | Delete seam bottom bags and unify them into square bottom valve bags |
| Lamination quality | No clear requirements | New ≥18g/m² indicator |
| Firmness test | 6 drops | Modify the test method (Appendix C) |
Key technical requirements
Physical and mechanical properties
Laminated plastic woven bags and paper-plastic composite bags must meet the following requirements: Tensile load ≥500N (warp),
Moisture resistance
According to the Appendix E test, after being stored in an environment with 80% humidity for 7 days, the 3d compressive strength ratio of cement is ≥85%. Actual cases show that three-layer stretch paper bags have the best moisture resistance, with a strength retention rate of more than 90%.
Implementation suggestions
- Production process adjustment: Eliminate bottom seam bag equipment and upgrade the heat sealing system of square bottom valve bag
- Quality control points: The laminating process needs to add online weighing detection (±0.5g/m²)
- Acceptance test: It is recommended to use the user on-site drop test method in Appendix C
Standard evolution analysis
This standard has been revised five times from 1988→1996→2002→2010→2020, mainly reflecting three major trends: ① Improved environmental protection requirements (deletion of PVC materials); ②Automation adaptation (unified bag type); ③Transportation loss control (enhanced firmness). The 2020 version clearly defines the quantitative indicators of filling process adaptability for the first time (15s/bag).
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