Explore our specialized range of high-efficiency machinery, functional aquaculture supplements, and bio-nutritional feed components designed for commercial excellence.
Hangzhou Pawlix Pet Co., Ltd. stands as a global leader in both high-performance aquaculture feeds and the technical integration of functional processing technologies. From our advanced manufacturing facilities based in Hangzhou, China, we combine scientific formulation expertise with heavy-industry equipment intelligence. Our dual focus guarantees that clients receive not only world-class processing systems but also deep biological insights into how feeds function in commercial settings.
By blending state-of-the-art machinery engineering with nutritional chemistry, we help feed mills, commercial cooperatives, and machinery distributors optimize raw material starch gelatinization, regulate pellet density, and elevate FCR (Feed Conversion Ratios). Our engineering approach tackles the challenges of industrial-scale aquaculture, delivering machinery that keeps pace with fast-evolving global feed requirements.
Achieving top quality in floating, sinking, and slow-sinking aquafeed requires highly customized extrusion parameters, precise thermal control, and state-of-the-art preconditioning.
Highly configurable twin-screw units offer controlled shear forces, ensuring high starch gelatinization (>85%) to produce stable, water-resistant floating and sinking feeds.
Multi-channel steam and water injection ensures raw materials are thoroughly hydrated and pre-heated, minimizing mechanical wear on screws while maximizing digestibility.
Equipped with vacuum venting and adjustable die backpressure valves to control the expansion ratio, allowing seamless transitions between floating, slow-sinking, and rapid-sinking feed modes.
A deep look into the mechanics of extrusion cooking, post-extrusion conditioning, and nutritional preservation.
Modern commercial aquaculture demands pellets that maintain physical integrity under water to prevent nutrient leaching, while remaining highly digestible for marine species. Achieving this balance depends on managing Specific Mechanical Energy (SME) and Thermal Energy (STE) inputs within the extruder barrel.
During extrusion, starch sources (such as wheat, corn, or cassava) undergo gelatinization, transforming into a binder that traps protein and lipid particles. For sinking shrimp feed, we use specialized screw configurations with high-shear kneading blocks and reverse elements. This setup creates dense, cohesive structures with minimal expansion, allowing the feed to sink cleanly and remain stable in water for up to 12 hours. Conversely, for floating feeds (like tilapia or catfish feed), we configure the system to optimize expansion. Water flashing off as steam at the die face creates a porous, low-density cell structure that ensures the pellets float reliably.
Additionally, applying temperature-sensitive ingredients—like Bacillus Subtilis probiotics or highly emulsifying lysolecithin powder—requires careful thermal management. High heat inside the extruder barrel can destroy these beneficial compounds. To solve this, our technical roadmap features Post-Extrusion Vacuum Coating (PEVC). By drying the extruded pellets to a porous state and using vacuum pressure, we can inject liquid lipids, enzymes, and probiotics directly into the pellet's core. This technique preserves the viability of active biological compounds while keeping fat levels high.
| Feed Category | Target Species | Starch Gelatinization Min. | Water Stability (Hrs) | Expansion Ratio | Density Control Method |
|---|---|---|---|---|---|
| Floating Pellets | Tilapia, Catfish, Carp | > 90% | > 16 Hours | 1.8 - 2.2 | Atmospheric expansion, high SME, high thermal inputs |
| Slow-Sinking Pellets | Salmon, Trout, Seabass | > 85% | > 8 Hours | 1.1 - 1.3 | Partial vacuum venting, medium shear, post-extrusion oil injection |
| Rapid-Sinking Pellets | Penaeid Shrimp, Crab | > 92% | 12 - 24 Hours | 0.9 - 1.05 | Full vacuum extraction, high shear, intense preconditioning |
Different regions present unique climates, feed ingredients, and farming systems. We customize our machinery to fit local production environments worldwide.
In Southeast Asia (Vietnam, Thailand, Indonesia), high humidity and intensive shrimp farming require sinking pellets with exceptional water stability. Our installations in these regions focus on ultra-fine pulverization systems (micro-ground to <150 microns) paired with twin-screw extruders that achieve high gelatinization, ensuring minimal nutrient loss in brackish water.
In Latin America (Ecuador, Peru, Chile), shrimp and salmon operations require high-throughput equipment capable of handling high levels of plant-based protein concentrates, like organic soy protein. We customize these setups with wear-resistant screw components and high-capacity vacuum coaters to manage lipid levels up to 30% without compromising pellet durability.
For Africa and the Middle East, where tilapia and catfish farming dominate, our focus shifts to single-screw and twin-screw designs that run efficiently on local raw materials, such as cassava and local grain by-products. These systems feature robust cooling configurations to handle high ambient temperatures and keep operations running reliably.
Purchasing wholesale aquatic feed processing equipment from China offers key advantages in lead times, technology integration, and cost-effectiveness. The industrial clusters in China bring together steel fabrication, CNC precision engineering, and advanced automation controls into a single, efficient ecosystem.
At Hangzhou Pawlix Pet Co., Ltd., we utilize this integrated supply chain to source top-tier raw materials, including SUS304 and SUS316 stainless steel, high-torque gearboxes, and Siemens or ABB electrical components. This local availability allows us to manufacture highly customized machinery with short lead times. We conduct rigorous quality inspections—from dynamic balancing of high-speed cutters to ultrasonic testing of extruder barrels—ensuring all equipment meets international standards before leaving the factory.
By managing everything from design and alloy casting to PLC programming under one roof, we help clients reduce capital expenditure while maintaining high build quality and performance. Our direct-from-factory model ensures spare parts are delivered quickly and engineering support remains accessible throughout the machinery's lifecycle.
Years Engineering Expertise
Countries Exported To
Average Starch Gelatinization
Micro-pellet Capability
Common questions from B2B feed mill operators, technical managers, and commercial buyers.
Complete your production setup with our high-capacity processing hardware and functional nutritional additives.
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