Extruder for Australian Pet Food: How Hongyang Helped a Melbourne Manufacturer Achieve Consistent Kibble Quality and 85%+ Starch Gelatinization

Executive Summary

The Australian pet food extrusion market reached USD 0.66 billion in 2025 and is projected to grow to USD 0.91 billion by 2034 at a CAGR of 3.59%. Premiumization is the dominant trend — Australian pet owners increasingly demand nutritionally complete, highly digestible kibble with consistent shape and texture. For a mid-sized Melbourne-based pet food manufacturer, the challenge was clear: their aging single-screw extrusion line could no longer meet these quality standards. After evaluating multiple suppliers across Asia and Europe, they selected Hongyang Feed Machinery’s twin-screw extrusion system. The result: starch gelatinization rates exceeding 85%, digestibility improvement of approximately 30%, and kibble uniformity that strengthened their retail partnerships with national pet store chains.

The Australian Pet Food Landscape

Australia is home to over 28.7 million pets across approximately 69% of households — one of the highest pet ownership rates globally. The country’s pet food sector is mature and competitive, with major players like Mars Petcare and Nestlé Purina dominating shelf space. However, the past five years have seen a surge in premium and super-premium brands targeting health-conscious pet owners who read ingredient labels as carefully as their own food labels.

This shift places enormous pressure on mid-tier manufacturers. Retail buyers for chains like Petbarn and PETstock evaluate kibble on visual uniformity, density, texture, and guaranteed nutritional specifications. A batch with inconsistent pellet size or incomplete starch gelatinization risks rejection — and a lost retail contract.

Our Melbourne-based client, a family-owned manufacturer with roughly 40 employees, had been producing dry dog and cat food for the domestic market for over 15 years. Their single-screw extruder, installed in 2010, was struggling on three fronts: starch gelatinization rarely exceeded 62-65%, kibble density varied by up to 12% between batches, and throughput was capped at approximately 800 kg/h — insufficient for growing orders from a major retail chain.

Why Twin-Screw Extrusion Matters for Pet Food

Extrusion is the defining process step in dry pet food production. Raw ingredients — meat meals, grains, vegetable proteins, vitamins, and minerals — are conditioned with steam and water, then forced through an extruder barrel where high temperature (typically 120-160°C), high pressure (3-8 MPa), and intense mechanical shear transform the material.

Single-screw extruders, while cost-effective for basic formulations, have inherent limitations in mixing homogeneity, residence time distribution, and process flexibility. Twin-screw extruders offer several documented advantages:

Starch gelatinization above 85%. In traditional cooking processes, starch gelatinization reaches only 50-60%. Incompletely gelatinized starch is difficult for pets to digest, leading to nutrient waste and potential gastrointestinal issues. Twin-screw extrusion at controlled temperatures of 120-160°C and pressures of 3-8 MPa pushes gelatinization past 85%, loosening starch molecular structures for significantly higher digestibility.

Protein utilization exceeding 80%. The controlled thermal-mechanical environment of twin-screw extrusion causes moderate protein denaturation, which opens spatial structures and improves enzyme accessibility. Protein utilization can rise from approximately 65% in traditional processes to over 80%. Additionally, the high-temperature short-time process inactivates anti-nutritional factors — trypsin inhibitors in soybean meal, for example, can be inactivated by up to 98%.

Uniform kibble density and shape. Twin-screw extruders provide superior mixing and pumping consistency, which directly translates to uniform product density, controlled expansion, and consistent kibble shape. This uniformity matters not just for aesthetics — it ensures every piece of kibble delivers the same nutritional profile and palatability, and it simplifies downstream coating processes where fat and palatant application rely on consistent surface area.

The Hongyang Solution

After conducting trials with material samples at Hongyang’s facility in Liyang, Jiangsu, the client selected a TSE-75 twin-screw extrusion line configured for pet food production. Key specifications included:

- Screw diameter: 75 mm (co-rotating, intermeshing) – L/D ratio: 28:1, with modular screw elements for adjustable shear intensity – Processing capacity: 1,200-1,800 kg/h depending on formulation density – Pre-conditioner: double-shaft differential speed conditioner with retention time control – Die plate: quick-change design supporting multiple kibble shapes (round, triangle, bone) – Temperature control: multi-zone barrel heating/cooling with ±1°C precision

The modular screw configuration was critical for this client. Australian pet food formulations vary significantly — grain-free recipes with high legume content behave differently in the barrel than traditional grain-based recipes. Adjustable shear zones allowed the production team to optimize for each formulation without changing equipment.

Hongyang’s engineering team completed installation and commissioning in 18 days, including operator training on recipe changeover procedures, barrel temperature profiling, and preventive maintenance schedules.

Results: Measurable Quality and Productivity Gains

The client began production with the Hongyang TSE-75 line in early 2025. After six months of operation, they shared the following performance data:

Metric, Before (Single-Screw), After (Hongyang TSE-75), Improvement: Starch gelatinization rate, 62-65%, 85-89%, +37% Protein digestibility (in vitro), 65-68%, 82-86%, +27% Kibble density variation (batch-to-batch), ±12%, ±3.5%, 71% reduction Throughput (standard dog food), 800 kg/h, 1,550 kg/h, +94% Energy consumption per ton, 58 kWh/t, 47 kWh/t, -19% Product rejection rate, 4.2%, 0.8%, 81% reduction

The most commercially significant outcome was the starch gelatinization improvement. The client’s quality assurance team reported that the 85%+ gelatinization rate was independently verified by a Melbourne-based feed testing laboratory, and this data point became a key differentiator in their retail negotiations. Their premium “Grain-Free Adult Dog” formula, launched in mid-2025, explicitly markets “highly digestible extruded kibble” on its packaging.

The energy efficiency gain — a 19% reduction in kWh per ton — translated to approximately AUD 27,000 in annual electricity savings at Australian industrial electricity rates, contributing to a faster return on investment.

Customer Feedback

In a follow-up conversation in May 2026, the client’s production manager noted: “The uniformity is what impressed our retail partners most. When they visit and see batch after batch of identical kibble coming off the line, it builds confidence. The technical support from Hongyang has also been responsive — we had a screw configuration question for a new salmon-based recipe, and their engineering team provided clear guidance within 24 hours.”

The client has since placed an order for a second TSE-75 line to expand capacity for cat food production, expected to be commissioned in Q3 2026.

Conclusion

The Australian pet food market rewards manufacturers who deliver measurable quality — consistent starch gelatinization, reliable digestibility, and uniform product appearance. For mid-tier producers competing against multinational brands, equipment performance is a strategic variable, not just a cost item. Hongyang’s twin-screw extrusion technology, backed by responsive engineering support, enables precisely these outcomes. The Melbourne client’s experience demonstrates that a well-configured extrusion line can simultaneously improve product quality, increase throughput, and reduce energy costs — a combination that strengthens competitiveness in any market.

*About Hongyang Feed Machinery: Liyang Hongyang Feed Machinery Co., Ltd. is a specialized manufacturer of feed processing equipment based in Liyang, Jiangsu, China. The company produces ring die pellet mills, extruders, hammer mills, coolers, conditioners, crumbler, and complete feed production lines. With a focus on engineering quality and responsive customer support, Hongyang serves feed and pet food manufacturers across over 30 countries.*