новости компании о Why Are Wet-Type Twin-Screw Fish Feed Extruders Preferred for High-Oil and High-Fat Feed Formulations?

Wet-type Twin screw floating fish food pellet maker machines solve the "lubrication slip" problem in high-fat fish feed production (>12% fat). By using positive displacement conveying and external steam conditioning, they decouple heat generation from internal friction. This ensures stable starch gelatinization (85%+), precise floating control, and the ability to process complex recipes (like Salmon or Shrimp feed) that dry-type single-screw machines cannot handle.

The Challenge: Why High-Fat Recipes Fail in Traditional Systems

Modern aquaculture demands high-energy diets with lipid levels often exceeding 15% to 20% to optimize Feed Conversion Ratios (FCR).

In a single-screw system, oil acts as a lubricant that coat particles, causing the material to rotate with the screw rather than moving forward. This leads to:

• Lost Friction: No heat is generated, leaving starch raw.

• Surging: Inconsistent discharge and pellet size.

• Low Expansion: Pellets sink because they lack the porous structure needed for buoyancy.

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4 Reasons Why Wet-Type Twin-Screw Floating Fish Feed Pellet Extruder Machine Excels with High-Oil Formulations

1. Positive Displacement (The "Pump" Mechanism)

Unlike Dry Type single screw floating fish feed pellet machines that rely on friction, Wet-type Twin screw floating fish feed making machines utilize intermeshing screws. They function like a positive displacement pump. Even if the formulation is heavily lubricated by fish oil or poultry fat, the mechanical intermeshing forces the material forward with high volumetric efficiency.

• Result: Stable throughput regardless of the oil percentage.

2. Precise Control of Specific Mechanical Energy (SME)

In Wet-type Twin screw floating fish feed pellet making machine, energy is balanced between Thermal Energy (Steam) and Mechanical Energy (Shear).

• Because the screws provide high shear even at high fat levels, manufacturers can precisely control the SME.

• This ensures that the starch matrix is sufficiently "cooked" (gelatinized) to trap air and ensure the pellets float, even when the formula is heavy and dense.

3. Superior Mixing and Homogenization

High-fat ingredients, especially liquid oils and full-fat soy, must be perfectly emulsified with the protein and starch base. Wet-type Twin screw floating fish feed production machines offer intensive mixing zones (kneading blocks) that:

• Distribute lipids evenly.

• Prevent "oil bleeding" (oil leaking out of the pellet).

• Create a consistent texture that improves water stability.

4. Self-Cleaning and Reduced Downtime

High-fat recipes can be sticky and prone to buildup. The intermeshing design of twin screws provides a self-cleaning effect, wiping the barrel walls and the opposite screw clean. This prevents material degradation and reduces downtime for maintenance.

1000-1200kg/h Wet-type Twin screw floating fish feed pellet making machine test for French customers

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Technical Comparison: Single-Screw Fish Feed Extruder Machine vs. Twin-Screw floating Fish Feed Extruder

The Ultimate Solution: Extrusion + Vacuum Coating

For ultra-high-fat feeds (e.g., 30% fat Salmon feed), even Wet-type Twin screw floating fish food maker machines reach a limit. The industry "Best Practice" is a two-step process:

1. Extrusion: Use a Wet-type Twin screw floating fish feed pellet maker machine to create a high-quality, porous pellet with 10-15% internal fat.

2. Vacuum Coating: Apply the remaining 10-15% oil after drying. The vacuum forces the oil into the core of the pellet, ensuring it doesn't wash off in the water.

FAQ: 

Q1: Can I just upgrade my single screw floating fish feed pellet extruder machine to handle more oil?

A: You can try increasing the screw speed or using a longer barrel, but you will always hit a "friction ceiling." If your recipe exceeds 10% total fat, a Twin screw floating fish food extruder machine is the only way to ensure commercial-grade stability and pellet durability.

Q2: Why does my high-fat feed fall apart in the water?

A: This is usually due to low starch gelatinization. The oil prevented the extruder from reaching the 110°C-120°C required to "cook" the starch glue. Wet-type Twin screw fish feed extruder machines use steam and mechanical shear to ensure a strong starch matrix that resists water dissolution.

Q3: Is a Wet-type Twin screw fish feed making machine worth the higher investment?

A: Yes, if you are producing premium feeds. The ROI comes from:

1. Lower Fines: Less wasted feed dust.

2. Ingredient Flexibility: Ability to use cheaper, high-fat raw materials (like full-fat soy).

3. Market Price: High-energy floating feed commands a significantly higher market price than basic sinking feed.

Q4: Does the type of oil matter for extrusion?

A: Yes. Animal fats (like poultry fat) have higher melting points and may behave differently than fish oil. Wet-type Twin screw floating fish food pellet maker machines allow for precise temperature adjustments along the barrel to manage these differences.

Conclusion

For feed manufacturers looking to compete in the high-performance aquaculture market, Wet-type Twin screw floating fish food extruder machines are not just an option—they are a necessity. By overcoming the lubrication challenges of high-lipid diets, these machines provide the stability, quality, and versatility required for modern fish farming.

Get a quote for a Wet-type Twin Screw Floating Fish Feed Pellet Mill

Время Pub : 2026-06-12 16:40:44 >> список новостей