| • Printing process section | |
| Gravure printing | the peak concentration of ethyl acetate reaches 3,000–5,000 mg/m³ (60–80% of the total solvent), and the residual amount of toluene is 50–150 mg/m³ |
| Flexo printing | ethanol/isopropyl alcohol mixed solvent (boiling point difference of 40 ℃), emission concentration fluctuation of 200–800 mg/m³ |
| UV curing | Active diluent (acrylates) residual 20–50 ppm with ozone by-products (concentration 5–10 mg/m³) |
| • Composite coating section | |
| Dry compound | The instantaneous emission of ethyl acetate accounts for 90% of the total process, and the concentration gradient is 800–1,500 mg/m³ |
| Solventless composite | trace MDI monomer escape (concentration 0.5–2 ppm), accompanied by atomized particles of silicone oil (D50=1–3 μm) |
| Hot melt adhesive coating | paraffin hydrocarbon volatilization (C20–C30 accounted for 40–60%), exhaust gas temperature maintained 80–120 ℃ |
| • Post-processing section | |
| Cutting process | ink secondary volatilization (benzene series accounted for 25–35%), PM₂.₅ particulate flux 0.5–1.2 g/h |
| Bag heat sealing | PE/PP film thermal decomposition to produce low molecular aldehydes and ketones (formaldehyde concentration 10–30 mg/m³) |
