Water Immersion Retort for Safe Food Sterilization

Foodline’s water immersion retort utilizes hot water as the heat transfer medium to sterilize food products at high temperatures and pressures. Sealed food products are fully submerged in circulating hot water, ensuring uniform heat exposure across all product surfaces. This food retort machine is suitable for food packaged in flexible pouches, plastic containers, metal cans, and other heat-resistant packaging. Contact Foodline for a free quote tailored to your product and production requirements.

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Foodline Water Immersion Retort for Sale

The water bath retort is a pressure-vessel sterilization system used in food processing. It immerses sealed food products in hot water and applies controlled temperature and pressure during the sterilization process.

Our water immersion retort is available in single-tank and two-tank configurations. The two-tank configuration is the more common design. It has an upper hot-water tank and a lower sterilization tank. The upper tank stores and preheats the process water, and the lower tank holds the products during sterilization. once the water reaches the set temperature, it flows from the upper tank into the lower tank, completely immersing the product.

Sterilization temperatures can reach 121–130°C, enabling low-acid and neutral-pH sealed foods to achieve a shelf life of 6 to 24 months at room temperature.

Key components of the two-tank retort include:

Double-layer horizontal pressure vessels made of 304 stainless steel
PLC control system with touchscreen, capable of storing multiple sterilization recipes and monitoring temperature and pressure in real-time
Safety systems such as multi-level door interlocks, over-pressure protection, and power-failure recovery
Auxiliary parts like sterilization baskets, heat exchange pipes, and cooling water lines

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Specifications of Foodline Water Immersion Autoclave

Heating Method	Model	Vessel Dimension	Overall Dimension	Volume m³	Capacity	Total Power	Power Supply / Power Consumption	Trays / Trolley
Electric / Steam	700*1200	700*1200*4	2300*1200*2350	0.57	120	72	380/72	3 pcs / 1 trolley
Electric / Steam	800*1500	800*1500*4	2700*1300*2500	1.1	135	72	380/72	3 pcs / 1 trolley
Electric / Steam	900*1800	900*1800*4	3050*1400*2700	1.36	550	95	380/95	8 pcs / 2 trolleys
Electric / Steam	1000*2200	1000*2200*4	3600*1600*2950	1.94	630	96/120	380/96/120	12 pcs / 3 trolleys
Electric / Steam	1000*2400	1000*2400*4	3800*1600*2950	3.2	780	96/120	380/96/120	15 pcs / 3 trolleys
Electric / Steam	1200*3000	1200*3000*5	4450*1800*3400	3.75	880	120 / Steam	380/120	15 pcs / 3 trolleys
Electric / Steam	1200*3600	1200*3600*5	5050*1800*3400	4.56	1000	120 / Steam	380/120	20 pcs / 4 trolleys

We manufacture a wide range of water immersion retort models. Contact us for model selection advice, equipment specifications, and factory pricing.

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How Does the Double-Tank Retort Sterilizer Work?

1. Preheating: The upper tank heats the process water to the set sterilization temperature.
2. Water Filling and Product Immersion: Hot water flows rapidly from the upper tank into the lower sterilization tank, fully submerging the products. A circulation pump varies the water flow direction to ensure uniform heating (temperature variance controlled within ±0.5°C).
3. High-Temperature Sterilization: Compressed air enters the sealed retort to build back pressure. This balances the pressure inside each package and stops pouches, plastic bottles, and boxes from swelling or breaking. The retort holds the temperature until it reaches the set F value.
4. Hot Water Recovery: After sterilization, the hot water is pumped back into the upper storage tank for use in the next batch.
5. Cooling: Cooling water enters the retort under pressure. The temperature is lowered in stages, after which the retort door opens for unloading.

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Why Are Food Products Fully Immersed in Water?

Full water immersion is a key feature of the water immersion retort sterilizer.

Water offers superior heat transfer efficiency compared to air. consequently, the hot water envelops the entire package, transferring heat from multiple directions. Continuous water circulation also helps minimize temperature variations between products located in different parts of the vessel.

This is highly beneficial for food products that require uniform heat distribution during the sterilization process.

The water-immersion method is also ideally suited for flexible pouches and lightweight packaging. The buoyancy of water can reduce the impact of mechanical stress on certain types of packaging during high-temperature processing.

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Technical Advantages of Water Immersion Sterilizer Retort

1. Uniform Heat Distribution: All products are immersed in circulating water. Heat penetrates effectively even into large packages or dense food items. The F-value remains stable, ensuring consistent product quality across batches.
2. Suitable for Flexible Packaging: The combination of water buoyancy and counter-pressure protection prevents soft pouches, bottles, and plastic trays from expanding, leaking, or bursting. This ensures an attractive final product suitable for retail display.
3. Energy and Water Efficiency: The system recycles hot water for the next batch, reducing heating costs. Rapid hot water injection shortens the heating-up phase, thereby increasing production throughput.
4. Fully Automated Process: Heating, holding, pressurization, water circulation, and cooling operations are all automated. The system records sterilization curves.

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Applications of Water Bath Sterilization Retort

Packaging Types:

• Flexible packaging: Retort pouches, aluminum foil bags, vacuum bags, stand-up pouches
• Plastic containers: PP/CPP bowls, boxes, bottles, and self-heating hot pot containers
• Metal cans: Tinplate and aluminum cans

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Different Retort Types

Retort Type	Main Heat Transfer Method	Characteristics
Water Immersion Retort	Hot water immersion	Product is fully submerged in hot water; suitable for various packaging formats
Water Spray Retort	Circulating hot water spray	Hot water is sprayed over the product during the sterilization process
Steam Retort	Direct steam	Uses steam as the primary heating medium
Rotary Water Immersion Retort	Hot water immersion + rotation	Rotation enhances heat transfer efficiency for high-viscosity and semi-solid products

Each type of retort has its own advantages. Water immersion retorts offer the gentlest and most uniform heating, and are ideal choice for flexible packaging and mixed-production lines.

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Foodline for Food Sterilization Equipment

Foodline manufactures a wide range of food sterilization and disinfection equipment tailored to diverse food processing needs. Our product portfolio includes food sterilization retorts, pasteurization machines, UV sterilization machines, counter pressure autoclaves, etc.

• Factory-direct pricing: You buy straight from the manufacturer, with no middleman costs.
• Extensive export experience: We have supplied equipment to food factories in France, Argentina, Mexico, the USA, Australia, South Africa, and more.
• Long-term support: We supply spare parts and technical help for the whole life of your machine.
• Strict Quality Control: Every unit undergoes comprehensive testing before shipment.
• Reliable Delivery: Production and shipping are punctual and dependable.

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Tell us about your product, package size, production capacity, and sterilization requirements for a water immersion retort. Our product manager will recommend the best retort model for your factory.