CY/T 228-2020 in English
VALIDGreen printing materials - Blanket for offset printing
- Issued on:2020-11-16
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
本标准规定了绿色印刷使用的胶印橡皮布的术语和定义、技术要求、检验方法及判定规则。
本标准适用于符合绿色印刷材料要求的胶印橡皮布的判定。
Introduction
Analysis of the core content of the standard
CY/T 228-2020 has for the first time formulated systematic green environmental protection requirements for offset rubber blanket, focusing on the control of 7 types of hazardous substances:
| Types of Hazardous Substances | Limit Requirements | Detection Methods |
|---|---|---|
| Phthalates | DEHP+DBP+BBP ≤0.1% DNOP+DINP+DIDP ≤0.1% | GB/T 29608-2013 |
| Total Heavy Metals (Pb+Cd+Hg+Cr) | <100 mg/kg | GB 6675.4-2014 |
| TVOC emission | ≤0.6 mg/m²·h | Appendix B Small environmental chamber method |
Technology evolution analysis
Compared with the traditional offset blanket standard GB/T 33248-2016, the innovations of this standard are:
- Additional volatile organic compound control: For the first time, a single indicator of benzene series (≤0.6 mg/m²) is stipulated
- Introduction of dynamic detection method: A small environmental chamber is used to simulate actual use conditions to detect TVOC
- Strengthen traceability: require sample packaging to be labeled with complete production information
Implementation difficulties and solutions
Case: Dealing with a problem of excessive TVOC in a certain enterprise
Testing found that a certain model of offset rubber blanket released TVOC of 1.2 mg/m²·h, and the standard was met through the following measures:
- Replace the rubber compound formula and use water-based cross-linking agent instead of solvent-based additives
- Add a 40℃ pre-bake process to accelerate the volatilization of low molecular weight substances
- Improve packaging materials and use aluminum foil composite barrier film
Compliance recommendations
Enterprises should pay special attention to the following when implementing this standard:
- Raw material control: Establish a banned list of phthalate plasticizers
- Process optimization: Increasing the vulcanization temperature to above 150°C can reduce free formaldehyde
- Detection points: Samples need to be tested after balancing in a constant temperature and humidity environment for 24 hours
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