company news about Troubleshooting Twin screw floating fish feed pellet making machines: Clogging and Uneven Pellets

Frequent clogging and uneven pellets in a Twin screw floating fish feed pellet extruder machine are typically caused by improper moisture balance (target 22-28%), insufficient grinding fineness (materials should be 1/3 the size of the die hole), and unstable steam pressure. To fix a clog, immediately stop the feeder, increase screw speed to purge the barrel, and clean the die plate. For uneven pellets, synchronize the cutter speed with the extrusion rate using a Variable Frequency Drive (VFD).

1. Raw Material Specs: The "1/3 Rule" for Particle Size

The most common cause of die blockage is poor grinding.

• The Problem: If you are producing 1.5mm pellets but your corn meal is ground to 1.0mm, the particles will bridge and jam the die holes.

• The Solution: Follow the 1/3 Rule. Your raw materials should be ground to a fineness that is at least one-third of the die hole diameter.

• Technical Tip: For micro-pellets (<2mm), use a Pulverizer to achieve 80-100 mesh fineness.

2. Moisture & Conditioning: The "Dough" Consistency

If the material is too dry, it won't cook; if it's too wet, it becomes a sticky paste that clogs the barrel.

• The Ideal Range: Target a conditioned moisture of 24% to 26% for floating feed.

• Wet Steam Warning: "Wet" steam (containing water droplets) is a leading cause of sudden surges and blockages. Ensure your steam lines have a high-quality water separator and pressure reducing valve.

• The Fix: If the motor load (Amps) spikes, immediately increase water injection slightly to "lubricate" the barrel, or reduce the feeding speed.

3. Mechanical Sync: Cutter and Screw RPM

Uneven pellets (some long, some short) are usually a mechanical synchronization issue rather than a material one.

Quick Troubleshooting Matrix

4. Pro-Tips for Beginners 

• The "Startup Purge": Never start a Twin screw floating fish feed making machine with high-protein formulas. Begin with a "starting material" (mostly corn flour and 25% moisture) to heat the barrel safely before switching to your actual recipe.

• Stop-Sequence: When shutting down, always purge the barrel with corn meal until the discharge is clear. This prevents the "concrete effect" where high-protein feed hardens inside the die overnight.

• Blade Sharpening: Dull blades don't cut; they "tear," leading to uneven, furry pellets that sink or break easily.

5. FAQ: 

Q: Why is my Twin screw floating fish  machine clogging every 30 minutes?
A: This is likely due to fiber buildup or coarse particles. Check your grinding mesh. If your raw material contains high fiber (like rice husks), it can form a "mat" behind the die plate. Use a finer screen on your hammer mill.

Q: How do I fix uneven pellet lengths in floating feed?
A: Uneven length is caused by a mismatch between the extrusion speed and the cutter speed. Use a VFD (Inverter) to precisely match the cutter RPM to the material flow. Also, ensure the cutter blades are making even contact across the entire die face.

Q: Why are my pellets sinking even though I am using a floating feed machine?
A: Sinking pellets mean low expansion. This is usually caused by: 1. Barrel temperature too low (<120°C); 2. Insufficient starch in the recipe; or 3. Worn screws that can't build enough pressure.

Q: What should I do if the material starts flowing back out of the feeder?
A: This is called "Backflow." It happens when the pressure in the barrel is higher than the screw can handle. Immediately stop the feeder and check if the die holes are blocked or if the screws in the compression zone are worn out.

Q: Is it normal for the Twin screw floating fish food maker machine to vibrate during operation?
A: Mild vibration is normal, but heavy shaking indicates an unbalanced cutter or a large foreign object (like a bolt) stuck in the screws. Shut down immediately and inspect the magnetic trap.