GB/T 34849-2017 in English
VALIDBiaxially oriented polystyrene heat shrinkable film
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
《GB/T 34849-2017双向拉伸聚苯乙烯热收缩薄膜》由TC48（全国塑料制品标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
1. Scope of the standard
GB/T 34849—2017 specifies the classification, specifications, requirements, test methods, etc. of biaxially oriented polystyrene heat shrinkable films, and is applicable to heat shrinkable films produced with polystyrene resin as the main raw material.
2. Film classification and recommended size
| Category | Specification | Recommended size |
|---|---|---|
| Classification | Divided into low, medium and high shrinkage films according to the transverse shrinkage rate. | Low shrinkage film: suitable for general heat shrinkage requirements; medium shrinkage film: suitable for medium shrinkage requirements; high shrinkage film: suitable for high-intensity shrinkage scenarios. |
| Thickness | 0.040 mm, 0.045 mm, 0.050 mm, 0.060 mm, 0.070 mm | Other sizes can be adjusted according to specific applications. |
| Width | 150 mm~1500 mm | Length: 2000 m~6000 m. |
3. Technical Requirements and Test Methods
3.1 Dimension Deviation
The thickness deviation shall meet the requirements of Table 1, and the length deviation and width deviation shall be tested according to Table 2.
| Nominal thickness d/mm | Average thickness deviation/% | Thickness limit deviation/mm |
|---|---|---|
| ≤0.040 | ±5 | ±0.004 |
0.040| ±4 | ±0.005 | |
| ＞0.060 | ±4 | ±0.006 |
3.2 Appearance requirements
The film should be free of obvious defects such as bubbles and impurities. The end surface flatness should be ≤5 mm. The number of sections per roll should not exceed 2, and the length of each section should be ＞200 m.
3.3 Physical and mechanical properties
| Item | Requirements | |
|---|---|---|
| Tensile strength/MPa | Longitudinal | ≥25 |
| Transverse | ≥55 | |
| Nominal strain at break/% | Longitudinal | ≥180 |
| Transverse | ≥20 | |
4. Implementation Suggestions
In actual application, it is recommended that enterprises:
- Strictly follow the standards for raw material procurement and production.
- Regularly calibrate test equipment to ensure detection accuracy.
- Establish a complete quality control system.
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