Dry Type vs Wet Type Floating Fish Feed Extruder Machine: 4 Key Differences

Key Takeaways

1. Heat source is the core difference: Dry-type floating fish feed making machines use mechanical friction for heat (no steam boiler needed); wet extruders use steam and water conditioning.
2. Feed type differs: Dry-type fish feed pellet processing machines handle floating feed and low-expansion products; wet extruders excel at sinking feed and high-expansion products.
3. Cost gap is significant: Dry extruder systems cost approximately 50–70% less than wet extruder systems.
4. Site requirements differ: Dry extruders need only a power supply; wet extruders require steam, water, drainage, and ventilation infrastructure.

Key Terms

Dry-type floating fish feed pellet extruder machine

A fish feed extruder that generates processing heat through mechanical friction and shear inside the extrusion chamber, without requiring an external steam boiler or water conditioning system.

 

Wet-Type floating fish feed pellet extruder machine

A fish feed extruder that uses injected steam and water to control moisture and temperature during extrusion, typically requiring a steam boiler, conditioner, and dryer as auxiliary equipment.

 

Starch Gelatinization

The process in which starch granules absorb water and swell under heat and pressure, creating the porous structure needed for pellet expansion.

 

Extrusion Degree

The level of cooking and expansion achieved during extrusion, which determines whether pellets float or sink and affects digestibility.

 

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What Is the Main Difference Between Dry-Type and Wet-Type fish feed pellet extruder machines?

Both dry-type and wet-type floating fish feed pellet maker machines are used to produce fish feed pellets, but they work on fundamentally different principles. Understanding these differences is essential for choosing the right equipment for your feed type and budget.

Below, we break down the four key differences between dry and wet fish feed extruder machines.

1. Heat Source and Steam Boiler Requirement

This is the most fundamental technical difference. In a dry-type floating fish feed pellet making machine, the rotating screw compresses the feed material against the barrel wall, generating temperatures of 120–160°C through friction alone. No steam, no external heat source.

In a wet-type fish feed pellet extruder machine, steam is injected into a pre-conditioner and directly into the extrusion barrel. This provides more precise control over temperature and moisture, which is important for producing high-expansion floating feed at an industrial scale.

2. Feed Type and Aquaculture Target

The extrusion degree - how much the pellet expands - determines whether feed floats or sinks. Wet extruders provide better control over moisture and temperature, which allows higher expansion ratios for floating pellets.

Dry extruders can also produce floating feed when the formulation contains sufficient starch (typically 20–30%) and conditions are properly adjusted. However, wet extruders are generally preferred for premium floating feed at industrial scale due to their superior conditioning control.

For example, when producing sinking feed for grass carp, the compact pellets produced by a dry-type floating fish food pellet maker machine sink quickly to the bottom, matching the bottom-feeding habits of grass carp. When producing floating feed for bass, the high expansion effect of a wet-type floating fish food extruder machine allows pellets to float on the surface for extended periods, matching the surface-feeding behavior of bass and reducing feed waste.

3. Site Requirements and Infrastructure

This difference has a major impact on where you can install the equipment. A dry extruder can be set up on a family farm, in a small workshop, or in a remote area with basic electricity. A wet extruder requires significant infrastructure investment beyond the machine itself.

Operating a wet extruder also requires specialized technicians who understand steam systems, pressure management, and safety protocols. Dry extruders are simpler to operate and require less technical expertise.

4. Equipment Cost and Operating Complexity

The cost difference comes from the auxiliary equipment required. A wet extruder system includes the extruder, steam boiler, water treatment, conditioner, slide rail, ect. A dry extruder system is essentially just the extruder and a feeder.

Operating costs also differ. Wet extruders consume steam, water, and electricity and require more maintenance for the steam system and auxiliary equipment. Dry extruders consume primarily electricity and have lower maintenance requirements.

Full Comparison: Dry-Type vs Wet-Type Fish Feed Extruder Machines

Table 4. Comparison of components for dry-type and wet-type floating fish food extruder machines

Neither type is universally "better." The appropriate choice depends on your target feed type, available infrastructure, and investment budget.

How to Choose the Right fish feed pellet extruder machine

Choosing between a dry-typ and wet-type fish feed extruder comes down to three key questions:

1. What type of feed do you want to produce? Sinking feed for bottom-feeding fish works well with dry type floating fish food extruder machines. Premium floating feed for surface-feeding fish is best produced with wet extruders.
2. What infrastructure do you have? No steam boiler or water system? Choose dry. Have industrial facilities with steam supply? Wet extrusion is viable.
3. What is your budget? Dry extruder systems cost 50–70% less. If budget is limited, start with a dry extruder and upgrade later.

MIKIM offers both dry-type and wet-type fish feed extruder machines, as well as complete fish feed production lines. We can help you select the right configuration based on your specific formula and budget. Contact us for a free consultation.

Conclusion

Dry-type and wet-type aquatic feed pellet extruder machines differ in four key areas: heat source, feed-type suitability, site requirements, and equipment cost. A dry-type extruder is the practical choice for small- to medium-scale producers who need a compact, affordable machine without steam infrastructure. A wet-type extruder is the right choice for commercial feed mills that require high-quality floating feed production with precise conditioning control.

The decision should be based on your production volume, target feed type, available infrastructure, and budget - not on which type is "better" in general. Both types have their strengths, and MIKIM offers both options to match your specific needs.

MIKIM 350kg/ h dry-type floating fish feed pellet extruder machine feedback form Cameroon Customer