GB/T 39415.2-2020 in English
VALIDPackaging sacks—Method of specifications for characteristics—Part 2:Sacks made from thermoplastic flexible film
- Issued on:2020-11-19
- Implemented on:2021-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 39415.2-2020包装袋 特征性能规范方法 第2部分：热塑性软质薄膜袋》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
Standard Overview and Technical Background
GB/T 39415.2-2020 is a modified and adopted standard of ISO 8351-2:1994, which puts forward systematic specification requirements for the characteristic performance of thermoplastic flexible film bags. The standard was issued on November 19, 2020 and officially implemented on January 1, 2021. It is managed by the National Technical Committee for Packaging Standardization (SAC/TC49).
Analysis of core technical requirements
1. Bag type classification system
The standard divides thermoplastic soft film bags into two types: open bags and valve bags:
| Type | Sub-categories | Typical characteristics |
|---|---|---|
| Open bags | Flat edge heat sealed | No hem structure, direct heat sealed |
| Hexagonal bottom flat edge bonding | Hexagonal bottom structure | |
| Hem heat sealed with corners sealed | With hem and special corner treatment | |
| Valve bag | Flat edge heat-sealed side valve port | Valve port located on the side |
| Hem heat-sealed side valve port | With hem and side valve port |
2. Key dimension measurement specifications
According to GB/T 31556.2, the main measurement parameters include:
- Bag length (a): maximum longitudinal dimension
- Valve port width (g): valve port opening width
- Valve sleeve position (l): distance between valve sleeve and bag edge
- All dimensions are in millimeters (mm)
3. Material technical requirements
The standard puts forward detailed requirements for film materials:
Actual case: PE-LD (low-density polyethylene) film should indicate thickness (μm), melt flow index (g/10min) and special treatment requirements such as anti-static. The aluminum coating of the composite material needs to specify the coating direction.
Comparison of domestic and foreign standards
| Technical elements | ISO 8351-2:1994 | GB/T 39415.2-2020 |
|---|---|---|
| Valve sleeve width | There are clear requirements | Delete this requirement |
| Air hole style | Required only below the valve port | Add interlayer air hole specifications |
| Valve port position | Descriptive provisions | Clear left/right valve port |
Suggestions for the implementation of the standard
1. Key points for the preparation of ordering documents
- Must include the three core elements of bag type, size and material
- The air hole requirements should indicate the three-dimensional indicators of quantity, spacing and size
- Printing requirements need to clarify the weather resistance index of ink
2. Key points of quality control
- The longitudinal bonding overlap width deviation should be ≤±1mm
- The heat sealing margin (n) needs to be destructively tested
- The valve port sealing should be verified by air pressure test
Technology evolution trend
This standard reflects the following technology development directions:
- From single material to functional composite materials
- Valve port design tends to be precisely positioned
- Environmental protection requirements are gradually integrated into material specifications
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