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Nelgreen is a Medium Industrial Insulated Containers supplier focused on roto-molded, PU-insulated tubs for seafood handling and cold-chain logistics. The medium series covers the NL480L, NL630L and NL660L models, specified when an operation needs more than a portable ice box but less than a high-volume palletized bulk unit.

As a China factory based in Yuyao, Ningbo, we control mold design, rotational molding, raw material selection and batch inspection in-house. That integration matters when the same container must survive forklift handling, saltwater washing and repeated ice loads.

A Positioned Step in the Industrial Range

Within the broader Industrial Insulated Containers portfolio, the medium tier balances usable volume against practical handling. These containers are used on trawler decks, in processing halls, at wholesale markets and during refrigerated or iced distribution.

• The NL480L is a rectangular LLDPE insulated fish tub for general seafood transport and storage, with enough capacity for batch lots.
• The NL630L round insulated fish tub suits shrimp and seafood operations where a circular footprint reduces corner damage and simplifies close packing.
• The NL660L large container fish tub is built for transportation, with volume and stacking behavior aimed at logistics cycles.

All three models are available under OEM/ODM terms. We adjust colors, logos, drains, handles and internal features without changing the core insulation structure.

Range Overview

Nominal capacities are based on the model family and should be checked against internal dimensions when planning batch weights. We confirm usable volume on the drawing before mass production. Detailed configuration is documented on the NL480L LLDPE insulated fish tub product page.

Materials and Construction

Medium industrial containers are not single-wall ice boxes scaled up. The shell is rotationally molded with an integrated double-wall structure, then filled with high-density polyurethane foam. This removes glued liners and cold joints that can fail in daily ice and washdown cycles.

• Food-grade LLDPE is used for surfaces that contact seafood and ice. The material remains stable across repeated cleaning with saltwater and mild detergents.
• The molded wall transfers impact load into the body, not into an inner liner, which matters on boat decks and truck loading ramps.
• Drain plugs, lids, sealing areas and handle mounting points are configured per model and order; we verify each component before assembly.

The 480 L and 660 L models are aimed at rectangular logistics. The round 630 L design reduces stress concentration in the sidewall and suits high-turnover shrimp work. Engineering drawings for each project confirm usable depth, wall thickness and stacking height.

Handling, Integration and Maintenance

Operators handle these containers with manual labor, pallet jacks, forklifts or conveyor transfer points. We specify the model and any structural additions around the actual loading method.

• Stacking ribs transfer the load of full containers and keep lids from being crushed during transport.
• A well-placed drain reduces handling time: water can be released before weighing, re-icing or loading into a processing line.
• Round models pack closely in trucks and use space efficiently when similar diameters are batched together.

Maintenance is straightforward. After each cycle, empty the ice water, rinse with fresh water, wash with mild detergent, keep the drain open while the tub dries, and inspect lid seals and drain plugs. No electrical or pneumatic connections are required, so the containers integrate with existing wash racks and pallet systems without additional line infrastructure.

Quality Assurance and Acceptance

Batch quality starts with incoming raw material checks and carries through molding parameters, wall thickness inspection, lid fit and drain assembly. These checks are recorded by the production team and retained for order traceability.

The factory operates under BSCI, ISO 9001, SGS, RoHS, FDA and Alibaba factory verification. Compliance documents are included with the order package, and pre-shipment inspection can be arranged on the finished containers. We treat dimensional checks, visual surface checks and functional drain tests as part of the standard release process.

Information We Use to Configure Your Solution

We prepare a configuration and quotation from the actual working point, not from a generic model list. For each project, we need the following inputs.

• Product type, starting temperature and target temperature during the cold chain.
• Ice, gel pack or refrigerant strategy and expected duration.
• Batch size per container and containers per day or per truck.
• Pallet dimensions, stack height and transport mode.
• Handling method: forklift, pallet jack, conveyor or manual.
• Lid, drain, color, logo and accessory requirements.
• Quantity forecast for tooling and production planning.

With this information we define the model, internal volume, wall specification, drain and lid arrangement, and stack plan. That becomes the basis for drawings, samples and the quotation. For projects with existing medium tubs, we can also review your current container dimensions and compare the NL480L, NL630L and NL660L against your pallet pattern.

Frequently Asked Questions

What is the difference between the medium and large industrial insulated containers?

The medium series is selected when operators still handle containers individually and when pallet patterns need to balance volume with floor loading. The larger models in our industrial range serve higher-volume, typically palletized or mechanically handled logistics. We confirm the crossover point after reviewing your stacking plan and available handling equipment.

Can these containers hold crushed ice directly on top of seafood?

Yes. The food-grade LLDPE interior and sealed drain are designed for ice contact. However, a passive insulated tub holds temperature; it does not generate cold. For best results, pre-chill product to the target temperature, use the correct ice-to-product ratio and keep the lid closed during transport.

Do you support OEM branding and mold modifications?

We do. Logo placement, colors, drain configuration, handle positions and some structural improvements can be developed through our mold and tooling team. The medium series can also be customized with accessories such as reinforced lids, tie-down points or special drainage kits.

How should these containers be cleaned between loads?

Drain the ice water, rinse the interior with fresh water, wash with a mild detergent, rinse again and dry with the drain open. Periodically check the drain plug gasket and lid seal. Saltwater environments do not require special materials, but regular freshwater rinsing extends the service life of hinges and seals.

What do you need from us to prepare a specification and price?

We need product type, temperature requirements, container quantity, handling method, pallet size, stack height and any OEM preferences. With that information, we can propose the right model from the medium range, confirm internal capacity, and issue a quotation with drawings and lead time.