What is the difference between IQF freezing and blast freezing?

IQF (Individual Quick Freeze) technology uses a continuous fluidised bed or belt conveyor in a high-velocity cold air tunnel at -35 to -40°C. The high air velocity fluidises small, uniformly sized product pieces (peas, corn kernels, diced vegetables), keeping them moving and freezing them individually. Blast freezing (conventional air blast tunnel) freezes product on trays or in bulk cartons — product pieces may stick together as they freeze. IQF produces free-flowing, individually frozen pieces that are easy to portion; blast-frozen product may clump. For retail frozen vegetables where consumers need to pour out a measured amount, IQF is strongly preferred. For industrial or foodservice frozen product sold in bulk blocks, blast freezing may be adequate.

What cold storage temperature is required for frozen vegetables?

Commercial frozen vegetables should be stored at a product temperature of -18°C or below throughout the cold chain — from production cold store, through transport, to retail display and consumer freezer. Storage at -18°C is the international standard (Codex Alimentarius and most national food regulations). For long-term storage of 12 months or more, -22°C to -25°C product temperature is preferred to minimise quality degradation (colour loss, textural changes, moisture migration). The freezer capacity, insulation, and refrigeration system must be designed to maintain -18°C product temperature even at maximum throughput and under local ambient conditions.

Frozen Vegetable Production Line Manufacturers

Connect with verified frozen vegetable production line manufacturers on Towobo. Source IQF (Individual Quick Freeze) freezers, belt freezers, blanching and chilling systems, and complete frozen vegetable processing lines.

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Frozen vegetable production line scope

A frozen vegetable production line integrates all stages from fresh vegetable intake to frozen, packed finished product. The standard process sequence is: raw vegetable reception and inspection; washing (drum washer or air-bubble washer depending on vegetable type); grading and sorting (by size, weight, or optical inspection); cutting or trimming (for vegetables requiring size reduction — dice, slice, floret); blanching (steam or hot water to inactivate enzymes and reduce microbial load); cooling and dewatering (water or air chilling to below 10°C after blanching); IQF freezing (Individual Quick Freeze — conveyor through an air blast or impingement freezer at -35°C to -40°C to freeze each piece individually without clumping); check-screening for foreign body detection (metal detection or X-ray inspection); weighing and packaging (into retail bags, institutional packs, or bulk cartons); and cold store at -18°C to -22°C. IQF freezing is the standard for premium frozen vegetables — each piece freezes individually, preventing clumping, and maintains the texture and appearance of the fresh product better than block freezing.

Frozen Vegetable Production Line Manufacturers

Frozen vegetable production line scope

Frozen Vegetable Production Line Manufacturers

Frozen vegetable production line scope

Frequently asked questions

What is the difference between IQF freezing and blast freezing?

What cold storage temperature is required for frozen vegetables?

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