What should be considered when using the MAP machine for tomatoes?

Tomatoes are climacteric fruits with thin skin, high moisture content and high sensitivity to gas ratio, temperature and humidity, making them different from meat or cooked food for modified atmosphere packaging. Using a MAP machine for tomatoes requires targeted adjustments to keep tomatoes fresh, firm and palatable, and avoid common problems like rot, softening and off-flavors.

Pre-Packing Tomato Preparation

Only select fully mature but not overripe tomatoes with intact shape, no bruises, cracks or mold. Overripe tomatoes have strong respiration that breaks the internal gas balance quickly.

Pre-cool tomatoes to 10-15°C to remove field heat, and wipe off surface moisture to prevent condensation inside the package, which causes mold growth. Keep tomatoes at the same maturity and size for consistent packaging results.

Key Parameter Settings for MAP Machine for Tomatoes

The gas ratio is critical: use 60%-80% nitrogen, 5%-10% carbon dioxide and 10%-20% oxygen. Avoid over 15% carbon dioxide (causes bitter flesh) or under 8% oxygen (leads to anaerobic respiration).

Do not over-vacuumize, as it will damage tomato skin; keep the package slightly fluffy. Adjust sealing temperature based on film thickness to prevent air leakage, and leave proper space inside the package for full gas replacement.

Packaging Film & Post-Packing Storage

Choose special breathable high-barrier MAP film (25-40μm) instead of ordinary plastic film, to release ethylene and maintain gas balance. Store packaged tomatoes at 8-12°C, away from direct sunlight and high temperatures, and never freeze them. Regularly calibrate the MAP machine for tomatoes to ensure stable gas ratio and sealing performance.

With proper operation, a MAP machine for tomatoes can extend shelf life from 3-5 days to 7-15 days, retaining ideal texture and appearance for commercial sales.