1000 kg/h Dry-Type Twin-Screw Dog Food Extruder Machine Testing

Executive Summary

This report documents the factory verification of a 1,000 kg/h dry-type twin-screw pet food making machine. The testing objective was to measure the machine's performance in processing standard pet food formulations without the use of an external steam boiler. Key findings include stable throughput at rated capacity, an 88.5% starch gelatinization rate, and precise thermal control through mechanical shear and electric heating.

1. Verified Technical Specifications

The following performance data was recorded during a continuous 4-hour operation at the MIKIM testing facility.

1000 kg/h dry-type twin-screw dog food extruder machine testing

1,000 kg/h Twin-Screw Extrusion Stability & Quality Test

This footage documents the 1,000 kg/h dry-type extruder maintaining mechanical stability and torque consistency under a full production load. The trial verifies high-starch gelatinization (kibble quality) and precise cutting synchronization (output uniformity) for plum-blossom-shaped dog food.

• Mechanical Stability: Vibration-free operation with PID thermal control (±2.0°C variance).
• Kibble Quality: Targeted 1.8x expansion ratio ensuring structural integrity and digestibility.
• Output Uniformity: High-speed synchronized cutting with <0.4mm length deviation.

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2. Operational Observations

2.1 Thermal Management and Mechanical Shear

In the absence of external steam, the dry-type twin-screw dog food pellet extruder machine relies on mechanical friction (shear) and electric heating elements. Monitoring indicated that as throughput reached 1,000 kg/h, mechanical shear became the primary thermal driver. To maintain the target temperature of 135°C in the cooking zones, the PLC-controlled water-cooling jackets were utilized to prevent thermal runaway and protein denaturation.

2.2 Material Pre-conditioning

Testing confirmed that a moisture content of approximately 18% is required in the dual-axis conditioner for proper material plasticization. While defined as "dry-type," this moisture is essential to act as a lubricant and to facilitate the "flash-off" expansion required to achieve the desired pellet porosity upon exiting the die.

2.3 Uniformity of Pellet Formation

Under 1,000 kg/h load, the rotary cutting system maintained synchronization with the extrusion velocity. The resulting kibble showed a length deviation of less than 0.4mm. Die pressure was stabilized between 35 and 45 bar, producing pellets with consistent surface texture and structural integrity.

3. Formula Compatibility and Process Constraints

• Lipid Inclusion: Internal fat levels were tested up to 10%. Higher concentrations may reduce friction and impact the extrusion pressure. Post-extrusion coating is recommended for formulas requiring fat levels above this threshold.

• Ingredient Fineness: Raw material grinding should be maintained at a 60-mesh fineness (approx. 250μm). Coarser particles were observed to cause inconsistent pressure profiles and increased mechanical wear on the screw elements.

• Alternative Starches: Formulas using pea or potato starch required a reduction in screw RPM to compensate for the higher shear sensitivity of these ingredients compared to corn-based formulas.

4. FAQ

Q: What is the nutritional impact of the dry-type process?
A: The system operates on High-Temperature Short-Time (HTST) principles. Material residence time in the barrel is 20–30 seconds. This duration is sufficient for starch cooking while minimizing the degradation of heat-sensitive amino acids and vitamins.

Q: What maintenance interval is expected for the screw assembly?
A: Based on current wear measurements, the alloy screws are estimated to have a service life of 4,000 operating hours, contingent upon the use of 60-mesh ground materials and the absence of inorganic contaminants.

Q: Is post-extrusion drying necessary?
A: Yes. Kibble exits the die at approximately 18% moisture. To achieve a shelf-stable moisture content of <10%, a multi-layer conveyor dryer is required in the production line.

Q: Does a 1,000 kg/h dry-type twin-screw dog food pellet machine really not need a boiler?
A: Correct. This "dry-type" system generates heat through a combination of electric heating elements on the barrel and mechanical friction from the twin screws. It is designed for facilities that do not have steam infrastructure. However, for capacities exceeding 2,000 kg/h , steam-based "wet-type" systems are often more energy-efficient.

Q: Can I use this dry-type twin-screw dog food pellet maker machine to produce grain-free dog food?
A: Yes. The twin-screw configuration is capable of handling the high-viscosity and high-protein nature of grain-free ingredients like peas, lentils, and sweet potatoes. These materials often require more torque, which the 90kW main motor is configured to provide.

Q: What is the actual cost of operation for a 1,000 kg/h dog food line?
A: Operating costs include electricity (approx. 35-40 kWh per ton for the extruder), labor, and replacement parts (screws and dies). Because there is no boiler, you save on water treatment and boiler fuel costs, although electricity consumption is higher compared to wet-type machines.

Q: How do I change the shape of the dog food?
A: The shape is determined by the die plate. You can switch between shapes (e.g., heart, bone, or round) by changing the die at the front of the barrel. This process takes approximately 10 to 15 minutes.

Q: Why does my kibble crumble?
A: This is usually due to insufficient starch gelatinization or improper moisture. If the temperature or shear is too low, the starch doesn't "cook" enough to trap air and expand. Our PLC system allows you to adjust the screw speed and heating zones to correct this in real-time.

Q: Is a dryer and oil coater necessary for a 1-ton-per-hour line?
A: Yes. At 1,000 kg/h , manual drying is not possible. You will need a continuous multi-layer dryer to bring moisture down to 8-10% and an oil coating drum to apply fats and palatants, which are essential for nutritional balance and flavor.

Q: How much space is required for a complete 1,000 kg/h production line?
A: A full line (grinding, mixing, extrusion, drying, and coating) typically requires a minimum of 200 to 300 square meters. The layout can be configured in an "L" or "I" shape depending on your factory dimensions.

5. Conclusion

The 1,000 kg/h dry-type twin-screw Pet Food pellet Extruder demonstrated operational stability and met the specified physical quality targets for pet food production. The system is suitable for industrial applications where steam boiler infrastructure is not available or desired.

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