A water product refrigerated container is essentially a "portable mini-freezer" for seafood. It's specifically designed to preserve and transport perishable aquatic products like seafood, fish, and shellfish. Its core function is to maintain a precisely controlled low temperature inside (typically between -18°C and 0°C) using a powerful refrigeration system.
01
Why the low temperature?
The cold dramatically slows bacterial growth and the natural spoilage process, effectively hitting the "pause button" on decay. This locks in moisture, nutrients, and the original fresh flavor.
02
What makes it special?
Compared to regular refrigerators, it cools faster, stronger, and more consistently, with thicker insulation. It's commonly made from seawater-resistant stainless steel or heavy-duty insulated plastic, offering excellent seals to prevent cold air loss and keep out warm air and moisture. Many models also feature drainage holes and anti-slip designs.
03
Where is it used?
It's essential at every step: preserving the catch immediately after fishing on boats, temporary storage at markets, long-haul transport in refrigerated trucks, and even in restaurant kitchens or homes for bulk storage. It's the key equipment ensuring aquatic products stay fresh and safe from source to table, minimizing spoilage. Simply put, enjoying fresh seafood from afar would be much harder without it.
Advantages of large refrigerators
Super strong freshness lock, say goodbye to spoilage
This is the core value! Aquatic refrigerators can accurately and stably control the temperature below freezing point (usually 0℃ to -18℃ or even lower). Low temperature is like pressing the "pause button" on the spoilage process:
Inhibiting the rapid reproduction of bacteria: Most bacteria that cause aquatic products to rot and stink have significantly reduced activity or even go dormant at low temperatures.
Slowing down enzyme activity: Enzymes contained in aquatic products themselves break down proteins and fats, and low temperatures make these reactions extremely slow.
Locking in moisture and flavor: Rapid cooling can effectively reduce the loss of cell juice (commonly known as "drying loss"), maximizing the retention of the original elastic texture, delicious juice, and unique flavor of fish meat.
What this means for you
Fish, shrimp, crabs, and shellfish after fishing/purchasing can stay fresh in the box for several more days or even weeks! This greatly reduces the direct economic losses caused by spoilage. What customers buy/you eat are fresher aquatic products with better taste and appearance, which will naturally bring more repeat customers and a better reputation.
Powerful cold retention performance, unaffected by transportation jolts and door openings/closing
An aquatic product refrigeration box is not an ordinary foam box! Its "heart" is an extra-thick high-quality insulation layer (such as polyurethane foam), combined with a tightly sealed door gasket.
Excellent insulation: Even if it's hot outside or there's a brief power outage, the low temperature inside the box can be maintained for a long time, and cold air is not easy to escape.
Strong sealing: Effectively isolates external hot air and moisture from entering, preventing frost and water accumulation inside the box (frost will accelerate the dehydration and drying of aquatic products) and avoiding cold air leakage that wastes electricity.
Stable structure: The box body is strong, can withstand bumps and stacking during transportation, and is not easy to deform or be damaged, which would affect the sealing.
What this means for you
Whether it's a fishing boat at sea, a long-distance truck journey, or frequent door openings and closings to pick up goods in the market/kitchen, the temperature inside the box can remain relatively stable. You don't have to worry about cold air escaping instantly or drastic temperature fluctuations due to frequent door operations, thus avoiding dehydration and drying, and tough taste of aquatic products caused by repeated frosting and melting on their surfaces. The quality remains consistent.
Durable and resistant to damage, corrosion-resistant and easy to clean
The aquatic environment is humid and salty (seawater, blood, mucus), which ordinary materials can't withstand! Refrigerators usually adopt:
Food-grade stainless steel inner tank/outer shell: The top choice! It is extremely corrosion-resistant, scratch-resistant and rust-proof. It can be exposed to seawater and blood at will, and can be cleaned with a simple wipe, which is durable.
High-strength engineering plastics (PP/PE): Cost-effective, with good corrosion resistance. They are not easy to be damaged by the body fluids of aquatic products, are relatively light in weight, and have smooth surfaces that are easy to clean and disinfect.
What this means for you
Say goodbye to rust and peculiar smell: No need to worry about seawater salt corroding the box, causing rust to contaminate aquatic products or producing an unpleasant metallic smell.
Hygiene is guaranteed: The smooth inner wall and food-grade materials make cleaning simple and efficient. It can be rinsed with clean water or wiped with disinfectant, which effectively inhibits bacterial growth and cross-contamination, meeting food safety requirements.
Save money and worry: The strong and durable materials greatly extend the service life of the equipment, reducing the cost and trouble of frequent replacement due to corrosion and damage.
Flexible capacity and efficient space utilization
Aquatic refrigerators are designed with a strong focus on practicality:
Various specifications available: Ranging from small and portable ones (for families, small fishing boats, and temporary storage of small quantities at stalls) to large vertical/horizontal ones (for docks, processing plants, large restaurants, and transport vehicles), there is always a model that suits your needs.
Optimized internal space: The square and regular inner cavity design, combined with adjustable shelves/drawers (in some models), allows you to neatly stack fish, shrimp, and shellfish of various shapes and sizes like building blocks, maximizing the use of every inch of space.
Stackable design (especially for horizontal/container types): The top and bottom of the boxes are designed to be stable, allowing them to be safely stacked for storage. This greatly saves valuable floor space, making them particularly suitable for fishing boat cabins, market stalls, or cold storage with limited space.
Say goodbye to messy stacking! You can flexibly choose the right box according to your daily purchase/storage volume. Once neatly stacked, everything is clear at a glance, making access convenient and quick. There's no need to rummage through a mess to find items at the bottom. The stacking function enables limited space to store more goods, which is especially practical in places where every inch of space is precious.
Long-lasting cold retention for worry-free use, saving ice, effort and time
The core advantage of your aquatic product cold storage box lies in its "passive" super cold retention capability! It is not powered by electricity, but relies on an extra-thick, high-density insulation layer (such as top-grade polyurethane foam) and an excellent sealing design to lock in low temperatures.
Amazing cold retention durability: After putting in enough ice packs or ice cubes at one time, the low-temperature environment inside the box can be stably maintained for several days or even longer (far exceeding ordinary foam boxes or low-quality insulation boxes on the market). This means that in scenarios such as fishing boats going out to sea for operations, long-distance transportation, market stalls being open all day, or temporary power outages, you don't need to worry about the temperature rising rapidly at all times.
Significantly reduce ice replacement frequency: This is the most direct "saving"! You no longer need to frequently buy ice cubes, carry heavy ice cubes, or rush to open the box to replace ice packs every few hours. It saves the money for buying ice, the strength for carrying, and the time for frequent operations.
More stable and reliable temperature: The thick insulation layer and tight seal are like covering the cold air with a "super quilt", effectively resisting the invasion of external hot air, and greatly slowing down the fluctuation and rising speed of the temperature inside the box. It avoids the drastic temperature fluctuations in ordinary boxes caused by frequent door opening and closing or changes in ambient temperature, thereby reducing the repeated freezing and thawing, dehydration and drying (commonly known as "wind loss") and quality degradation of aquatic products caused by temperature fluctuations.
What this means for you
Extremely worry-free operation: Put enough ice at one time, and you can use it with peace of mind for a long time. It frees you from the tedious work of frequent ice replacement, which is especially suitable for situations where manpower is tight or continuous operation is required (such as fishing boat fishing, long-distance drivers).
Significantly reduce costs: It saves the cost of repeatedly buying ice cubes, and also reduces the loss and time cost that may be caused by frequent manual operations.
Upgraded quality assurance: The continuously stable low-temperature environment ensures that aquatic products are in the ideal fresh-keeping state from the time they are put in to the time they are taken out to the greatest extent, minimizing the loss of taste, moisture and freshness.
More calm response to accidents: In case of short-term power outages or transportation delays, its strong cold retention capability provides valuable safety buffer time, reducing the risk of losses caused by unexpected situations.
Ensuring food safety and compliance
Aquatic products are highly perishable and pose high safety risks. Refrigerated containers serve as an important safety line of defense:
A key link in the entire cold chain: They are the fundamental guarantee for realizing the full cold chain "from fishing boat to table", ensuring that aquatic products are always within the safe temperature range and inhibiting the growth of pathogenic bacteria (such as Vibrio parahaemolyticus).
Accurate temperature control records (for some high-end models): Some containers are equipped with built-in temperature displays and recorders, allowing you to monitor the internal temperature at any time and handle abnormalities promptly. These records are important credentials for responding to regulatory inspections and customer traceability needs.
Safe and easy-to-clean materials: As mentioned earlier, food-grade materials and easy-to-clean properties effectively prevent chemical and biological contamination.
What this means for you
Reduced food safety risks: To the greatest extent, it ensures that the aquatic products you store/sell are safe and hygienic, avoiding huge economic losses, legal disputes, and reputational damage caused by food poisoning incidents.
Easier compliance: It meets the mandatory requirements of food and drug regulatory authorities on the storage temperature of aquatic products, making it easy to cope with inspections, provide necessary temperature record evidence, and avoid fines or suspension of business for rectification due to non-compliance. This allows you to do business with more peace of mind and confidence.
Materials and manufacturing processes of thermal insulation boxes
Analysis of Core Materials
1.Insulation Layer Material: High-Density Rigid Polyurethane Foam (PU Foam)
Material Properties: It is a closed-cell foam formed by the chemical reaction of polyol and isocyanate, with a density of 40-45kg/m³ (much higher than 20kg/m³ of ordinary insulation cotton) and a closed-cell rate of >90%. The closed cells enclose low thermal conductivity gas (thermal conductivity is only 0.022W/m·K), forming an efficient thermal barrier. Adding flame retardants (such as ammonium polyphosphate) can reach the UL94 V-0 fire rating.
Why It Matters: The closed-cell structure prevents air convection and blocks water vapor penetration (water absorption rate <3%), avoiding the attenuation of insulation performance caused by moisture. The high density gives a compressive strength of >150kPa, ensuring that the box body does not deform when stacked.
Modified Polypropylene (PP): Glass fiber (to enhance rigidity) and antibacterial masterbatch (such as silver ions) are added to the base PP. The melt flow index is >25g/10min (at 230℃), ensuring injection molding fluidity. It complies with the FDA 21 CFR 177.1520 standard, and its service life against seawater pH corrosion (pH 7.5-8.4) exceeds 10 years.
Formula Design: HDPE resin (density 0.95g/cm³) is mixed with 2-3% carbon black (ultraviolet absorber) and antioxidant 1010 to delay photoaging. The surface is treated with corona (＞50dyne/cm) to improve paint adhesion.
Mechanical Properties: The tensile strength is >28MPa, and there is no crack when resisting ball drop impact (1kg 1.5m). The low-temperature embrittlement temperature is < -40℃, suitable for extremely cold environments.
Door Seal Structure: The internal hollow silicone tube (Shore hardness 50±5) provides elastic compression, and a neodymium-iron-boron magnetic strip (magnetic energy product >40MGOe) is embedded to achieve adsorption and self-locking. The surface is coated with an antibacterial coating (organosilicon quaternary ammonium salt) to inhibit mold growth.
Core Manufacturing Process Flow
Inner container/outer shell moulds: S136 mould steel (HRC 48-52) is used, shaped by CNC five-axis machining center, and the cavity is polished to a mirror finish (Ra 0.05μm). Conformal cooling channels are added, with temperature difference controlled within 5℃ to avoid shrinkage marks on injection-moulded parts.
Insulation layer moulds: Aluminium alloy cavities are plated with hard chrome (15μm thick), and high-pressure sealing rings (with pressure resistance > 20Bar) are installed on the parting surfaces to prevent foam overflow.
Process parameters: Barrel temperature: 210℃ for PP section / 230℃ for HDPE section; injection pressure: 80-120MPa; holding time: 30s. The mould temperature controller controls the mould temperature within ±1℃ (PP: 60℃ / HDPE: 40℃).
Quality control: Online infrared thermometers monitor the melt temperature. After parts are taken by manipulators, 3D scanning (with an accuracy of 0.02mm) is performed to compare with CAD models.
Equipment: High-pressure foaming machine (mixing pressure 150Bar), with AB material temperature difference within ±0.5℃ and flow error < 1%.
Process steps:
- Preheating: The mould is kept at a constant temperature of 45℃ (to reduce reaction thermal stress).
- Injection: PU mixture is injected into the cavity within 0.5 seconds (to prevent pre-curing).
- Curing: Heating in a 90℃ oven for 8 minutes to achieve a crosslinking degree > 95%.
- Demoulding: After mould opening, forced cooling to below 30℃ to prevent deformation.
Box assembly: PUR hot-melt adhesive (with an open time of 90 seconds) is applied between the insulation layer and the inner container/outer shell, and pressed by a hydraulic press (pressure 0.8MPa, holding time 3min).
Door seal installation: After the rubber strip is clamped into the pre-embedded groove, local high-frequency heating (13.56MHz) is used to soften the plastic, which forms a mechanical interlock after cooling.
Insulation test: After pre-cooling to -18℃, it is placed in a 25℃ environment for 48 hours, with a temperature rise ≤ 3℃ (as required by the national standard GB/T 22923).
Sealing detection: Negative pressure test (-30kPa pressure difference maintained for 10 minutes), with a leakage rate < 0.5Pa·m³/s.
Load-bearing verification: Stacking 3 layers with a full load of 1.5 times the rated weight (e.g., 500kg), with deformation < 2mm.
Insulated container size
Key Design Considerations for Insulated Container Sizes
Scenario Adaptation:
Sizes range from compact (50–100L) for home kitchens/market stalls to large commercial units (300–500L) for fishing vessels/cold chain trucks.
Examples: Vessel-specific widths ≤800mm to fit deck racks; truck-compatible heights (1.1–1.3m) align with standard pallets.
Cargo Compatibility:
Depth (400–600mm) accommodates water-filled foam crates; interior height reserves 15cm headspace for ice layers.
Door openings >300mm allow whole fish passage.
Ergonomics:
Single-person units weigh <25kg (loaded), with handles at 900mm (optimal lifting height).
Commercial models feature heavy-duty casters to reduce labor strain.
Space Efficiency:
Golden ratio dimensions (L:W ≈ 1.6:1) ensure stable stacking and 20% footprint reduction.
Sidewall 5cm air channels maintain temperature uniformity (±2°C).
Design Advantages
Maximized Spatial Efficiency:
Seamlessly integrates with transport systems (e.g., +40% truck space utilization); stackable design saves 50% floor area.
Operational Streamlining:
Door dimensions match standard fishery crates for sub-10-second loading; ergonomic features cut injury risks by 30%.
Cost Optimization:
Modular sizing minimizes custom fees; standardized parts slash maintenance inventories.
Quality Assurance:
Avoids cargo compression damage; engineered airflow prevents hot spots (<±2°C variance).
Precision sizing transforms insulated containers into space-optimized, labor-saving tools-boosting productivity while safeguarding product integrity across maritime, logistics, and retail operations, as demonstrated by field data from global seafood distributors.
| No | Item no | Outer size (mm) | Inner size(mm) | Weight(kg) | Colour |
| 1 | 3T320L | 1080*680*824 | 940*540*645 | 55 | Yellow, blue, white, green, etc. can be customized |
| 2 | 3T300L | 1000*770*720 | 920*690*515 | 32 | Yellow, blue, white, green, etc. can be customized |
| 3 | 3T460L | 1230*1030*670 | 1130*930*454 | 49 | Yellow, blue, white, green, etc. can be customized |
| 4 | 3T640CL | φ1150*930 | φ1050*735 | 52 | Yellow, blue, white, green, etc. can be customized |
| 5 | 3T660L | 1230*1030*820 | 1150*950*605 | 60 | Yellow, blue, white, green, etc. can be customized |
| 6 | 3T780L | 1200*1100*915 | 1100*1000*700 | 73 | Yellow, blue, white, green, etc. can be customized |
| 7 | 3T800L | 1230*1130*985 | 1130*1030*740 | 80 | Yellow, blue, white, green, etc. can be customized |
| 8 | 3T810L | 1200*1100*1005 | 1100*1000*745 | 80 | Yellow, blue, white, green, etc. can be customized |
| 9 | 3T820L | 1200*1150*975 | 1080*1030*755 | 80 | Yellow, blue, white, green, etc. can be customized |
| 10 | 3T1000LC | 1620*1160*840 | 1520*1070*640 | 98 | Yellow, blue, white, green, etc. can be customized |
| 11 | 3T1000LB | 1480*1155*1015 | 1325*1000*795 | 100 | Yellow, blue, white, green, etc. can be customized |
| 11 | 3T1000HL | 1160*1060*1280 | 1070*970*1040 | 98 | Yellow, blue, white, green, etc. can be customized |
Conclusion
The aquatic refrigerated container stands as a critical guardian of freshness in the seafood supply chain. Engineered with advanced insulation and precision sealing, it functions like a resilient mobile cold vault-stably maintaining target temperatures for extended periods to lock in freshness, moisture, and texture while dramatically reducing spoilage losses. Its corrosion-resistant exterior and easy-clean interior withstand harsh marine environments, market operations, and transport rigors with long-lasting durability.
Thoughtfully designed dimensions enable seamless integration into constrained spaces like fishing vessels and freight trucks, maximizing storage through space-efficient stacking while streamlining cargo handling. By eliminating dependency on electricity yet delivering exceptional cooling performance, this dependable solution empowers fishers, transporters, and vendors alike-silently preserving quality from ocean to table. More than equipment, it serves as the essential cornerstone of aquatic product integrity, combining reliability, efficiency, and effortless operation to safeguard every harvest's journey.
