Executive Summary
New Zealand’s pet food industry has experienced remarkable growth over the past decade. Cat and dog food exports surged from NZ$49.5 million in 2011 to NZ$196 million by 2024, reflecting an annual compound growth rate of 11.17%. As one of the world’s most trusted sources of premium pet nutrition, New Zealand manufacturers face intense pressure to deliver consistent pellet quality while scaling production to meet export demand.
This case study examines how Pacific Canine Nutrition Ltd., a mid-sized dog food manufacturer based in Waikato, New Zealand, partnered with Liyang Hongyang Feed Machinery Co., Ltd. to upgrade its pelleting line with an HYPM-series ring die pellet mill. The result: stable throughput of 4.2 tons per hour, pellet durability index (PDI) consistently above 96.5%, and starch gelatinization rates exceeding 82%—all critical quality metrics for premium export-grade dog food.
1. The New Zealand Pet Food Landscape
1.1 A Premium Export Powerhouse
New Zealand occupies a distinctive position in global pet food markets. The country’s reputation for pristine agricultural environments, grass-fed livestock, and stringent biosecurity standards has made “Made in New Zealand” a powerful differentiator on supermarket shelves from Shanghai to Los Angeles.
According to New Zealand’s Ministry of Foreign Affairs and Trade (MFAT), pet food exports to China alone reached NZ$134.3 million in the year ending June 2023, before adjusting to NZ$64.2 million by mid-2025 amid shifting consumption patterns. However, monthly trade data from late 2025 shows a strong recovery trajectory, with exports rising month on month.
The global pet food market was valued at approximately USD 137.3 billion in 2024 and is projected to reach USD 218.35 billion by 2033. Premium and super-premium segments—where New Zealand manufacturers predominantly compete—are growing faster than the overall market, driven by pet humanization trends and increasing consumer scrutiny of ingredient sourcing and manufacturing quality.
1.2 The Manufacturing Challenge for Premium Dog Food
Producing premium dry dog food presents unique technical challenges compared to standard livestock feed:
Parameter | Standard Livestock Feed | Premium Dog Food
Pellet Diameter | 3.0–8.0 mm | 6.0–12.0 mm
Target PDI | ≥ 92% | ≥ 95%
Starch Gelatinization | 25–35% | 75–85%
Fat Content | 2–5% | 8–18%
Protein Content | 14–20% | 26–38%
Fiber Content | 4–8% | 2–5%
The high fresh meat inclusion rates (often 30–50% in premium formulations) create a dough with elevated moisture and fat content, making consistent pellet formation significantly more difficult. Inadequate starch gelatinization—the process by which starch granules absorb water, swell, and rupture under heat and mechanical shear—results in poor pellet binding, excessive fines, and reduced nutrient digestibility for the animal.
For Pacific Canine Nutrition, these challenges were magnified by the company’s rapid export growth. Monthly production volumes had increased from 380 tons to over 900 tons within 18 months, and the existing pelleting line—originally specified for lower throughput—was struggling to maintain quality at the higher production rate.
2. The Customer: Pacific Canine Nutrition Ltd.
Pacific Canine Nutrition (PCN) operates a purpose-built dry pet food manufacturing facility in Waikato, New Zealand’s primary agricultural region. Founded in 2017, the company produces grain-free, high-meat-inclusion dog food formulations for private-label clients across Asia-Pacific markets, including Japan, South Korea, Taiwan, and China.
By early 2025, PCN’s production line consisted of:
- Raw material receiving and weighing systems
- A 2-ton twin-shaft paddle mixer
- A single-deck conditioner (steam injection)
- An aging ring die pellet mill operating at 2.8–3.2 TPH
- A counterflow cooler
- Crumbling and screening equipment
- Automatic bagging and palletizing
The bottleneck was the pellet mill. The existing machine was approaching the end of its service life, and ring die replacement cycles had shortened from 2,500–3,000 hours to approximately 1,600 hours. Pellet durability had declined from an acceptable 94% to approximately 90%—unacceptable for export shipments where container transit times of 3–6 weeks demand robust pellet integrity.
3. Hongyang’s Solution: HYPM 508 Ring Die Pellet Mill
3.1 Equipment Selection
After evaluating proposals from three international suppliers, PCN selected Liyang Hongyang Feed Machinery’s HYPM 508 ring die pellet mill. The decision was based on several factors:
- Production capacity matching: The HYPM 508 is rated for 4–5 TPH on standard livestock feed formulations. Working with PCN’s technical team, Hongyang engineers recalculated throughput expectations for the customer’s specific dog food recipe and confirmed a realistic target of 4.0–4.5 TPH.
- Ring die customization capability: Hongyang’s in-house ring die manufacturing facility allowed for precise customization of compression ratio (1:8.5), die hole diameter (8.0 mm), and effective length—parameters that require meticulous calculation for high-meat-content formulations. The company’s vacuum hardening process achieves surface hardness of HRC 60–62, with a hardened layer depth of 1.2–1.5 mm.
- Gear-driven transmission: Unlike belt-driven alternatives that can slip under variable load conditions common in pet food pelleting (where batch-to-batch recipe variations alter the mixture’s flow characteristics), the HYPM 508′s precision-ground helical gear drive ensures consistent torque delivery.
- Service and technical support: Hongyang committed to on-site commissioning by a senior engineer, remote diagnostics capability, and a guaranteed ring die delivery time of 15 working days for repeat orders.
3.2 Technical Specifications
Specification | Value
Model | HYPM 508
Main Motor Power | 132 kW
Ring Die Inner Diameter | 508 mm
Ring Die Effective Width | 160 mm
Die Hole Diameter (custom) | 8.0 mm
Compression Ratio (custom) | 1:8.5
Roller Assembly | 2-roller, eccentric adjustment
Feeder Motor | 2.2 kW, VFD-controlled
Conditioner Motor | 7.5 kW
Rated Capacity (dog food) | 4.0–4.5 TPH
Transmission | Helical gear, oil-bath lubrication
3.3 Process Integration
Hongyang’s engineering team worked closely with PCN to integrate the HYPM 508 into the existing production line with minimal downtime. Key considerations included:
- Steam conditioning optimization: For premium dog food, starch gelatinization is critical. Hongyang recommended a two-stage conditioning strategy: pre-conditioning the meal to 16–17% moisture at 70–75°C, then a retention time of 45–60 seconds in the conditioner barrel at 82–88°C before entering the pellet chamber. This stepwise approach prevents protein denaturation in the outer layer of meal particles while achieving sufficient heat penetration for starch gelatinization.
- Die speed selection: Running at 220–240 RPM (ring die peripheral speed approximately 5.8 m/s), the HYPM 508 achieved optimal throughput without excessive shear heating, which can degrade heat-sensitive nutrients like taurine—an essential amino acid for dogs.
- Post-pelleting cooling protocol: PCN upgraded its counterflow cooler to ensure pellets exit at ambient temperature +3°C maximum, preventing moisture migration and mold risk during storage and transit.
4. Performance Results
4.1 Production Stability
Six months after commissioning, PCN reported the following operational data:
Metric | Before Upgrade | After Upgrade | Improvement
Average Throughput | 3.0 TPH | 4.2 TPH | +40%
Pellet Durability Index (PDI) | 90.2% | 96.5% | +6.3 pp
Starch Gelatinization Rate | 72% | 82.5% | +10.5 pp
Ring Die Service Life | ~1,600 h | 2,800 h (projected) | +75%
Fines at Bagging (Unscheduled Downtime | 11.3 h/month | 2.1 h/month | -81%
Energy Consumption | 38.2 kWh/t | 34.6 kWh/t | -9.4%
4.2 Quality Consistency
The most commercially significant improvement was in pellet durability. For export shipments traveling 4–6 weeks by sea container, pellet integrity at destination directly impacts customer satisfaction and claim rates. PCN’s quality manager noted that customer complaints related to excessive fines dropped from 3–4 per quarter to zero in the six months following the upgrade.
Starch gelatinization, measured by amyloglucosidase method, reached 82.5%—well within the 80–85% optimal range for dog food digestibility. Undercooked starch (< 75% gelatinization) reduces nutrient availability, while over-processing (> 88%) can lead to Maillard reactions that bind lysine and reduce protein quality.
4.3 Customer Feedback
PCN’s Operations Director summarized the experience:
“We needed a pellet mill that could handle our high-meat recipes without constant adjustment. The HYPM 508 has delivered stability we hadn’t achieved before. Our operators spend less time troubleshooting and more time on preventive maintenance. The ring die quality—particularly the consistency of hole finish and hardness—has been a key factor in maintaining PDI above 96%. For a company shipping premium product across the Pacific, that consistency is non-negotiable.”
5. Hongyang’s Approach: Engineering for Real-World Conditions
This case study illustrates several principles that define Hongyang’s approach to feed machinery:
Application-specific engineering. Rather than offering an off-the-shelf pellet mill and hoping it would perform, Hongyang’s technical team analyzed PCN’s specific recipe parameters—moisture, fat content, fiber profile, and target pellet dimensions—before recommending the optimal ring die compression ratio and conditioning protocol.
Measurable performance commitments. Hongyang provided throughput and pellet quality targets upfront, commissioned the equipment on-site, and verified performance against those targets during the trial run period.
Ongoing partnership. Six months after installation, Hongyang’s service team maintains regular contact with PCN, monitoring ring die wear patterns through photographic analysis and advising on optimal change-out timing to prevent emergency shutdowns.
6. Industry Outlook
New Zealand’s pet food export recovery, combined with sustained global demand for premium pet nutrition, positions manufacturers like Pacific Canine Nutrition for continued growth. The ability to produce consistent, high-durability pellets at scale—without sacrificing the nutritional integrity that defines premium products—will separate market leaders from also-rans.
For feed machinery manufacturers, the premium pet food segment represents both an opportunity and a test. The formulations are more technically demanding than standard livestock feed. The quality tolerances are narrower. The commercial consequences of inconsistency are higher. Hongyang’s experience with PCN demonstrates that a combination of robust machine design, application-specific engineering support, and high-quality consumable parts—particularly ring dies—can meet these demands reliably.
October 2025 | Liyang Hongyang Feed Machinery Co., Ltd.
Technical data and performance metrics verified through on-site commissioning records and customer production logs. Third-party market data sourced from New Zealand MFAT trade reports and industry publications.
Post time: Jun-09-2026
