Vacuum Pre-Cooling Technology: The "Golden 30 Minutes" Rule for Fresh Produce
Vacuum pre-cooling technology achieves rapid cooling from field temperature to 4°C in just 30 minutes — with real operational data for leafy greens, mushrooms and berries.
After harvest, field heat and respiration heat accumulate continuously. Post-harvest loss rates reach 20%-30%.
Why Rapid Pre-Cooling?
| Parameter | No Pre-cooling | Vacuum Cooling | Difference |
|---|---|---|---|
| Time to 4°C | 4-8 hours | 20-40 min | 10x+ faster |
| Weight loss day 3 | 5%-8% | 1%-2% | 75% lower |
| Leafy green shelf life | 2-3 days | 7-12 days | 3-4x longer |
| Vitamin C retention (day 5) | ≤40% | ≥75% | Nearly 2x |
When chamber pressure drops below 660Pa, surface water evaporates at 2-3°C, achieving uniform deep cooling in 30 minutes.
CVF Series Capacity
| Model | Leafy greens/batch | Mushrooms/batch | Time |
|---|---|---|---|
| CVF-1000 | 1000-1200 kg | 800-1000 kg | 25-35 min |
| CVF-2000 | 2000-2400 kg | 1600-2000 kg | 25-35 min |
| CVF-3000 | 3000-3600 kg | 2400-3000 kg | 30-40 min |
Category Results
- Shanghai Bok Choy: 28°C→3°C, 28 min, 1.2% weight loss (cold room: 4.8%), shelf life 3→10 days
- White Mushrooms: 26°C→4°C, 32 min, browning reduced 60%
- Blueberries: 30°C→5°C, 25 min, firmness 95%, mold infection reduced 70%
Yuanxian Machinery | www.vacuum-fresh.com