Vacuum Sprayer for Aquatic Feed

Product Overview:

A piece of equipment designed to uniformly coat the interior of feed pellets with liquid fats/oils, flavoring agents, and functional additives under vacuum conditions; it is particularly suitable for the final seasoning and aroma-enhancing step in the production of freeze-dried seafood products.

Key Advantages and Selling Points:

Ultra-high inclusion rate: Liquid inclusion ranges from 1% to 35% (based on dry weight), easily meeting demanding requirements—such as the 9–10% oil coating needed for largemouth bass feed.

Deep penetration: Vacuum negative pressure drives liquid into the internal pores of the pellets, reducing surface oil loss by 80% and ensuring a retention rate of over 95% for heat-sensitive nutrients (e.g., Vitamin C).

Uniformity and precision: Multi-nozzle spraying over a thin material layer achieves a coefficient of variation (CV) ≤7% for uniformity, eliminating uneven coating ("mottling").

Gentle handling with minimal damage: Vertical mixing prevents pellet breakage, making it suitable for fragile materials such as extruded or freeze-dried products.

Energy efficiency and cost reduction: Vacuum impregnation consumes 12% less energy than atmospheric spraying; furthermore, eliminating the need for pre-mixing oil into the raw material boosts the throughput of ultra-fine pulverizers by 15% and extruders by 20%.

Primary Applications:

Spraying of oils, flavoring agents, vitamins, and enzyme preparations onto aquatic and pet feeds

Aroma fixation and seasoning of freeze-dried seafood (fish, shrimp, and shellfish)

Liquid additive application for fermented soft-pellet feeds

Basic Parameters (Typical Values):

Liquid addition ratio: 1%–35%

Spray uniformity (CV): ≤7%

Operating vacuum level: -0.06 to -0.09 MPa

Batch processing capacity: 200–2000 kg

Installed power: 7.5–55 kW

Equipment material: Stainless steel (corrosion-resistant)

Specific problems addressed:

Excessive oil loss → Vacuum infusion locks in nutrients, reducing the need for repeated re-application

Inability to spray high-oil content → 35% inclusion capacity meets all formulation requirements

Degradation of heat-sensitive ingredients → Low-temperature vacuum environment preserves nutritional value

Fragile granules → Gentle mixing maintains structural integrity

Rapid aroma loss → Oil encapsulation retains the scent for longer

Benefits for users:

Direct cost reduction: Savings of approximately 420 RMB per ton of feed on fat/oil costs

Quality improvement: Significant enhancements in palatability, stability, and shelf life

Production efficiency gains: Increased capacity utilization of upstream equipment and reduced overall energy consumption

Product premium: Differentiated feed (high oil content, rich aroma, high nutritional value) offers greater market competitiveness