8–13 T/H Industrial Pellet Cooler in Pakistan

Why the Punjab Aquafeed Plant Needed More Cooling Capacity

The production bottleneck appeared after the factory increased finished floating-feed output while keeping a smaller cooling section. Warm product could remain above a suitable packing temperature when the upstream dryer ran near its normal production rate. The customer therefore targeted one downstream machine instead of investing again in extrusion, grinding or mixing equipment that still had usable capacity.

This project also differs from a conventional livestock-feed cooler retrofit. Floating fish feed is formed by extrusion, not by a standard ring-die feed pellet mill, and wet extrudate must be dried before it is ready for final cooling. The cooler receives a substantially drier product and removes sensible heat so the feed can move toward screening, coating where required, storage and packing under controlled conditions.

Punjab is a practical setting because the customer serves freshwater fish-feed buyers that need several pellet sizes rather than one universal product. The plant schedules different runs for juvenile and grower fish, so cooling duty varies with pellet diameter, bulk density and line rate. That makes airflow and bed loading more important than simply matching one nameplate tonnes-per-hour figure.

SKLF20×20 Configuration for the Industrial Cooling Stage

The 8–13 T/H figure is a reference cooling range rather than a guaranteed result for every floating-feed product. Expanded pellets can have much lower bulk density than dense livestock feed, so the same mass flow can occupy more cooler volume. Pellet size, bed depth, inlet temperature, airflow resistance and fines all influence the practical rate that the cooler can handle without reducing temperature uniformity.

The customer selected this size because a cooler rated only around the lower edge of the 8–10 T/H production window would leave little reserve for low-density product or warmer dryer discharge. The SKLF20×20 gives more operating headroom without jumping to a much larger cooling section that would require additional height, airflow and supporting equipment beyond the plant's present production plan.

Floating Fish Feed Must Be Dried Before It Reaches the Cooler

Fresh extrudate leaves the extruder with far more moisture than a counterflow cooler should be expected to remove. The rotary or belt dryer performs the main dehydration duty first, bringing the product into the moisture range required by the feed specification. Only then does the cooler remove process heat and allow the dried pellet structure to stabilize before later handling and packing.

This process boundary is critical. Cooling may remove a limited amount of residual moisture as warm air passes through the product bed, but it is not designed to replace controlled drying. If pellets enter the cooler too wet, increasing airflow or residence time does not provide the same moisture control as a dryer and can create uneven surface drying while the pellet core remains unsuitable for storage.

Oil or palatant application is positioned according to the plant's actual formulation and coating system. Some products can be coated after cooling, while other processes apply liquids to warm dried pellets before a final temperature-stabilization step. The cooler selection therefore follows the confirmed process sequence instead of assuming that every aquafeed factory uses the same location for coating equipment.

How the Industrial Pellet Cooler in Pakistan Fits the Process

1. Ground and mixed ingredients enter the extrusion system.
2. The extruder forms floating feed at the required diameter and density.
3. Wet extrudate passes through the dryer for primary moisture reduction.
4. Dried warm pellets enter the SKLF20×20 counterflow cooler.
5. Cooling air passes through the pellet bed while the discharge system controls residence time.
6. Cooled feed moves to screening and then to coating, storage or packing according to the product route.

The Industrial Pellet Cooler in Pakistan therefore receives a finished-size product whose moisture has already been controlled by the dryer. Its job is temperature stabilization, not extrusion or dehydration. This distinction protects line balance because the extruder, dryer and cooler are sized as separate unit operations with different design duties even though they operate continuously in one production train.

The fan, ducting and dust-separation system are part of the cooling duty even though the cooler body is the main purchased machine. Air must pass evenly through the pellet bed and then leave the system without carrying excessive fines into the work area. The plant therefore reviews fan pressure, duct resistance and separator capacity together rather than selecting the cooler body in isolation.

Pellet Size and Product Density Are Checked Before Airflow Is Set

The main commercial products in this project are 3–4 mm floating pellets, while smaller juvenile feeds can be around 2 mm and larger grower products can reach about 5 mm. These diameters are realistic for freshwater aquafeed, but the plant does not assign one fixed pellet length to every product because cutter speed, expansion and die geometry determine the final length for each production run.

Final pellet size also affects cooling behaviour. Smaller pellets create a different void structure and pressure drop through the bed than larger expanded feed, while highly expanded pellets occupy more volume per tonne. The operator therefore adjusts bed depth and airflow from the actual product rather than assuming that a setting developed for 4 mm feed will automatically suit a 2 mm juvenile product.

Pellet diameter is kept separate from claims about floating time or water stability. A 3 mm pellet does not float for a certain period simply because of its size, and cooling cannot create floatability after extrusion. Density and water behaviour come mainly from formula, starch gelatinization, moisture, mechanical energy, screw configuration, die conditions and drying, with cooling preserving the physical state already produced upstream.

Airflow, Dust and Hot-Weather Operation Need Separate Controls

Pakistan's hot production seasons make absolute outlet temperature a poor fixed target. The practical objective is to bring feed reasonably close to prevailing ambient conditions before storage or packing, while avoiding excessive product temperature that can contribute to condensation later. The plant therefore monitors both ambient air and pellet discharge temperature instead of enforcing one permanent 30°C or 35°C setpoint.

Cooling air must be sufficient without becoming aggressive. Too little airflow leaves a warm pellet core, while excessive air velocity can entrain fines and increase dust loading in the exhaust system. Operators use temperature distribution, pressure behaviour and product condition to tune the fan and bed depth, and they inspect ducts and separators because dust accumulation can reduce cooling performance over time.

The 1.5 kW discharge drive is not the total electrical load of the cooling section. The exhaust fan, rotary airlock or separator where fitted, conveying and dust-control equipment can require substantially more power than the cooler discharge mechanism itself. Electrical planning therefore uses the complete fan-and-cooler package rather than presenting the small discharge motor as the energy demand of the whole process.

Karachi Logistics and Future Cooling Capacity

For machinery moving to a Punjab feed plant, Karachi is a practical maritime gateway before inland road or rail transport. Final routing depends on carrier service, package dimensions and the customer's forwarder, so the project does not assign fixed sea days, customs time or installation duration. Site preparation is based on confirmed support loads, inlet height, discharge elevation, fan location and duct routing.

Future expansion begins with the complete extrusion-to-packing balance. If the cooler still has reserve but the dryer, screener or packing section is full, adding another cooler would not raise saleable output. A second cooling unit or a larger model becomes relevant only when dried warm feed regularly accumulates ahead of the SKLF20×20 and the surrounding air-handling and downstream systems can accept more product.

For another buyer evaluating an Industrial Pellet Cooler in Pakistan, RICHI Machinery would review feed type, 2–5 mm product range, finished dry throughput, bulk density, dryer discharge temperature, coating sequence, allowable fines, ambient conditions, fan and duct layout, dust separation, downstream screening and available installation height before confirming the cooler and air-system configuration.