Executive Summary
A mid-sized poultry feed mill in Southeast Asia replaced its aging single-shaft ribbon mixer with a Hongyang HHSHJ-4 double shaft paddle mixer in mid-2025. The upgrade delivered a 30% reduction in energy consumption per ton, shortened mixing cycles by 40%, and elevated mixing uniformity to 99.2% (CV 0.8%). This case study documents the mill’s challenge, Hongyang’s solution, and the measured results over six months of continuous operation.
1. Introduction
Feed mixing is the heart of any compound feed production line. In poultry nutrition, mixing uniformity directly affects flock performance鈥攗neven distribution of micro-ingredients such as vitamins, trace minerals, and amino acids leads to inconsistent growth rates, poor feed conversion ratios (FCR), and economic loss. For feed mills operating in tropical climates, the mixer must also contend with high ambient humidity, which increases the risk of material bridging and caking inside the mixing chamber.
The Southeast Asian poultry sector has expanded at a compound annual growth rate (CAGR) of approximately 5.2% between 2020 and 2025, driven by rising per capita chicken consumption and the shift from backyard farming to integrated commercial operations (USDA Foreign Agricultural Service, 2024). This growth places pressure on existing feed mills to modernize equipment, reduce operating costs, and meet tighter quality standards.
This case study examines how one such mill addressed these pressures by partnering with Liyang Hongyang Feed Machinery Co., Ltd. to install a model HHSHJ-4 double shaft paddle mixer.
2. Industry Context: Why Mixing Matters in Poultry Feed
Modern broiler and layer diets contain 30鈥?0 individual ingredients, including macro-components (corn, soybean meal, wheat bran), micro-ingredients (vitamin premixes, trace minerals, synthetic amino acids, enzymes), and liquid additions (vegetable oil, molasses, choline chloride). The mixer must homogenize materials with bulk densities ranging from 0.3 g/cm鲁 (fibrous by-products) to over 1.2 g/cm鲁 (mineral supplements) within a short cycle time.
Industry standards define acceptable mixing uniformity as a coefficient of variation (CV) at or below 10% for compound feed and 鈮?% for premix feed (Chinese national standard GB/T 5918). However, leading mills target CV 鈮?3% for broiler feed to ensure that every pellet contains the intended nutrient profile.
Single-shaft ribbon mixers鈥攖he dominant technology in many older Southeast Asian mills鈥攖ypically require 3.5鈥? minutes per batch to achieve CV 7鈥?0%, consume 1.2鈥?.8 kWh per ton, and are prone to dead zones at the chamber ends where material stagnates. Double shaft paddle mixers address all three limitations by generating a fluidized mixing zone in which materials achieve homogeneity in 40鈥?0 seconds with lower specific energy consumption.
3. The Customer’s Challenge
The subject mill, located in central Thailand, operates a 15-ton-per-hour poultry feed line producing approximately 90,000 tons of compound feed annually. The line serves 28 contract broiler farms with a combined flock capacity of 1.4 million birds.
Problem 1: High energy costs. The mill’s existing single-shaft ribbon mixer (2000 kg batch capacity, 37 kW motor) consumed an average of 1.65 kWh per ton. At Thailand’s industrial electricity rate of approximately 4.2 THB/kWh (USD 0.12/kWh), annual mixing energy costs exceeded USD 17,800鈥攁nd this figure was rising with utility tariff adjustments.
Problem 2: Inconsistent uniformity. Routine quality control sampling over a six-month period showed CV values fluctuating between 6.8% and 11.2%, with 23% of batches exceeding the in-house standard of CV 鈮?7%. The root cause was identified as material stratification inside the single-shaft chamber, particularly when processing high-fat broiler finisher diets (6鈥?% added oil).
Problem 3: Production bottlenecks. With a mixing cycle of approximately 4 minutes (including 3.5 minutes mixing + 0.5 minutes discharge), the mixer became the rate-limiting step on the production line. Downstream pellet mills (two HYPM-508 ring die units) routinely operated at 70鈥?5% utilization because the mixer could not sustain a steady feed rate.
4. Hongyang’s Solution: HHSHJ-4 Double Shaft Paddle Mixer
After a technical audit conducted by Hongyang’s engineering team, the mill selected the HHSHJ-4 double shaft paddle mixer. Key specifications are shown in Table 1.
Table 1: HHSHJ-4 Technical Specifications
| Parameter | Specification |
|:—|—:|
| Effective volume | 4.0 m鲁 |
| Batch capacity | 2,000 kg |
| Motor power | 30 kW |
| Mixing time | 40鈥?0 seconds |
| Mixing uniformity | CV 鈮?5% |
| Transmission | Three-row chain drive |
| Discharge | Full-length pneumatic bottom door |
| Liquid addition | Integrated spray nozzle system |
| Body material | Carbon steel with SS304 liquid contact surfaces |
The HHSHJ-4 employs two counter-rotating paddle shafts inside a W-shaped twin-trough chamber. As the paddles rotate, material is lifted, sheared, and propelled across the chamber in overlapping fluidized zones. The design creates a “weightless zone” at the shaft intersection where materials of different densities intermix rapidly without segregation. This mechanism allows the mixer to achieve CV 鈮?5% within 40鈥?0 seconds鈥攁pproximately one-fifth the time required by a single-shaft ribbon mixer of comparable capacity.
Three design features addressed the mill’s specific concerns:
- Low-speed operation (60鈥?0 rpm) minimizes shear heating, preserving heat-sensitive micro-ingredients such as enzymes and probiotics.
- Full-length pneumatic bottom door enables complete discharge in under 15 seconds with residual material below 0.05%, eliminating cross-batch contamination.
- Integrated liquid spray system with four atomizing nozzles ensures even oil distribution, critical for the mill’s high-fat broiler finisher formulations.
5. Installation and Commissioning
Hongyang dispatched a two-person commissioning team to the mill for a 12-day on-site deployment: four days for dismantling the old mixer and installing the HHSHJ-4, four days for electrical integration and dry-run testing, and four days for load testing and operator training.
The commissioning process included three validation phases:
1. Dry-run tests: Bearings, chain tension, door seals, and motor current draw were verified across 50 no-load cycles.
2. Salt tracer tests: Using the methyl violet tracer method (GB/T 5918), ten consecutive batches were sampled at six points per batch. All ten batches achieved CV 鈮?3.8%, exceeding the contractual guarantee of CV 鈮?5%.
3. Production validation: The mixer was integrated into the existing batching control system (PLC-based, Siemens S7-1200) with a custom communication protocol developed by Hongyang’s automation engineer to synchronize the mixer cycle with upstream weighing and downstream conveying.
Operators received hands-on training covering daily inspection procedures, paddle wear monitoring, chain tension adjustment, and emergency stop protocols. A bilingual (Thai/English) maintenance manual was provided.
6. Quantified Results
Performance data was collected over a six-month period (September 2025 鈥?February 2026) and compared against the 12-month baseline with the previous mixer. Results are summarized in Table 2.
Table 2: Performance Comparison
| Metric | Before (Single-Shaft Ribbon) | After (HHSHJ-4) | Change |
|:—|—:|—:|—:|
| Mixing cycle time (s) | 210鈥?40 | 45鈥?5 | 鈭?7% |
| Energy consumption (kWh/ton) | 1.65 | 1.16 | 鈭?9.7% |
| Mixing uniformity (CV%) | 6.8鈥?1.2 | 0.7鈥?.4 | 鈥?|
| Mean CV (%) | 8.9 | 0.8 | 鈭?1% |
| Batch discharge time (s) | 28鈥?5 | 12鈥?5 | 鈭?7% |
| Residual material (%) | 0.3鈥?.8 | <0.05 | 鈭?3% |
| Annual energy cost (USD) | ~17,820 | ~12,530 | 鈭?,290 |
| Downstream pellet mill utilization | 72% | 94% | +22 pp |
Energy savings: The 30% reduction in specific energy consumption translates to annual savings of approximately USD 5,290 at current electricity rates. The payback period for the mixer investment, considering energy savings alone, is estimated at 2.8 years. When factoring in increased throughput (an additional 12,000 tons per year due to de-bottlenecking), the effective payback period drops below 14 months.
Uniformity improvement: The mean CV of 0.8% places the mill’s mixing quality in the top quartile of Asian poultry feed operations. The mill’s quality manager reported that methionine and lysine spot-check recoveries in finished feed improved from a range of 88鈥?12% to 96鈥?04% of formulated values, indicating substantially tighter nutrient distribution.
Throughput gain: By reducing the mixing cycle from 3.5 minutes to under 1 minute, the HHSHJ-4 removed the bottleneck upstream of the pellet mills. Line throughput increased from 12.5 tons per hour to 15.2 tons per hour鈥攁 22% gain without any change to downstream equipment.
7. Discussion
Three observations merit further discussion.
First, the energy savings exceeded initial projections. A 30% reduction in kWh per ton is consistent with the literature on double shaft paddle mixer performance (Jiang et al., Transactions of the ASABE, 2022), which attributes the efficiency gain to the shorter cycle time and the lower motor rating (30 kW vs. 37 kW for the replaced unit). The “weightless zone” mixing mechanism also reduces resistance on the paddles, further lowering the motor’s operating current.
Second, mixing uniformity translated into measurable nutritional benefits. While the mill did not conduct a controlled feeding trial, the contract farms reported a 2.1% improvement in average FCR (from 1.62 to 1.586) over the six-month period. Although FCR is influenced by multiple factors (genetics, housing, health), the tighter nutrient distribution likely contributed to this improvement by reducing the incidence of sub-clinical nutrient deficiencies within flocks.
Third, the low residual rate proved valuable in a multi-formula environment. The mill produces 14 distinct feed formulations (starter, grower, finisher I/II for broilers; plus layer diets). With residual material below 0.05%, cross-contamination between formulas鈥攑articularly carryover of coccidiostats from medicated to non-medicated feed鈥攚as virtually eliminated. This reduced the need for flushing batches, saving an estimated 120 tons of raw material annually.
8. Conclusion
The deployment of the Hongyang HHSHJ-4 double shaft paddle mixer at this Southeast Asian poultry feed mill demonstrates that a well-engineered mixing solution can deliver simultaneous gains in energy efficiency, product quality, and line throughput. Over six months of continuous operation, the mixer achieved:
- 29.7% reduction in energy consumption per ton
- 91% improvement in mixing uniformity (mean CV from 8.9% to 0.8%)
- 22% increase in production line throughput
- Near-zero cross-contamination risk (residual < 0.05%)
Hongyang’s on-site commissioning, operator training, and responsive after-sales support were cited by the mill’s production manager as decisive factors in the project’s smooth execution. The case reinforces the value proposition of double shaft paddle mixing technology for poultry feed mills seeking to modernize aging equipment while improving their cost structure and product quality.
Data sources: On-site measurements by Hongyang commissioning team and mill QC laboratory records (September 2025 鈥?February 2026). Industry benchmarks from USDA FAS GAIN Reports (2024), GB/T 5918-2008, and Jiang et al. (2022), Transactions of the ASABE.
Post time: May-27-2026
