In June 2024, Chinese freezing-equipment maker Square Technology delivered one of the country’s largest fluidized-bed IQF freezers to date: a 7-ton-per-hour cooked French-fries line, built around a three-zone cooling, chilling and deep-freezing process, for Liqun Group’s new food factory in Qingdao. For an industry accustomed to importing its flagship freezing lines from Europe, a domestic build at this scale is a milestone worth noting.
Three zones, one continuous line
The engineering logic is straightforward but demanding. Cooked fries must move from post-fry cooling through a chilling stage into deep freezing without clumping, breaking or losing their crisp-shell texture — and at 7 tons per hour there is no room for uneven airflow. The three-zone design sequences the thermal drop so each piece freezes individually while in fluidized motion, the defining requirement of true IQF. Delivering this as a single integrated line, rather than retrofitted stages, puts the installation in the same class as the large European-built systems that have dominated the segment.
There is also an efficiency story that processors will notice. A continuous three-zone line recovers and reuses thermal energy across stages instead of treating cooling, chilling and freezing as separate utilities loads — a meaningful operating-cost advantage when a line runs 7 tons an hour, shift after shift. As energy prices remain a standing concern for food factories, freezer design is becoming a cost-competitiveness issue, not just a quality one.
Why fries are the proving ground
French fries are among the most punishing products a freezer can handle: high throughput, sticky par-fried surfaces, strict demands on piece separation and color uniformity. Equipment that performs on a cooked-fries line at 7 t/h will handle diced onions, peppers, peas or mixed vegetables with ease. That is precisely why this delivery matters beyond the potato category — it demonstrates that domestic Chinese freezing equipment has matured to the point where large food factories specify it for their most demanding lines.
The takeaway for processors and buyers
For frozen-vegetable processors, the equipment landscape is shifting. High-capacity, domestically built IQF lines lower the capital barrier to adding or upgrading freezing capacity, which over time means more consistent product quality and more flexible production scheduling across China’s processing base. Buyers auditing suppliers should start asking about freezing-line specifications, not just cold-storage capacity — the freezer, more than the warehouse, now determines the quality ceiling of an IQF product.
