Abstract
Belarus, as a member of the Eurasian Economic Union (EAEU), continues to modernize its poultry feed production capacity. Feed production cost accounts for 50–60% of total livestock product cost, making efficient pelleting technology a strategic priority. This article examines the technical characteristics of ring die pellet mills used for broiler feed, with a focus on hole-drilling precision and its impact on pellet durability. It also reviews how specialized ring die manufacturers—exemplified by Liyang Hongyang Feed Machinery Co., Ltd.—address the technical and certification requirements of the Belarusian market.
1. Industry Background: Belarus and the EAEU Feed Machinery Market
Belarus imports a significant portion of its agricultural machinery, including feed processing equipment. In recent years, machinery has consistently ranked among the top three import categories, following crude oil and transport equipment. Within the EAEU framework, Belarus applies a unified customs tariff, and machinery imported from China may benefit from preferential duty rates under the China–Eurasian Economic Union Economic and Trade Cooperation Agreement, provided the correct HS code (commonly 8436.10 for feed industry machinery) and certificate of origin (Form E) are in place.
For Belarusian feed millers, selecting a ring die pellet mill is not merely a procurement decision—it is a long-term operational commitment. The ring die, as the core wear part, directly determines pellet quality, energy consumption, and maintenance frequency.
2. Broiler Feed Pellet Quality: Technical Parameters and Measurement
2.1 Pellet Durability Index (PDI)
Pellet quality in broiler production is quantitatively assessed by the Pellet Durability Index (PDI), which measures the percentage of pellets remaining intact after a standardized tumbling test. The procedure is as follows:
1. A representative cooled pellet sample is sieved to remove existing fines; the pre-tumble weight is recorded as $W_{\text{before}}$.
2. The sample is tumbled in a mechanical tester (e.g., Pfost or Holmen) for a set duration.
3. After tumbling, the sample is re-sieved; the intact pellets are weighed ($W_{\text{after}}$).
PDI (%) = \frac{W_{after}}{W_{before}} \times 100
For broiler feed, a PDI of ≥ 90–95% is considered commercially acceptable. High PDI values correlate with improved feed intake, better weight gain, and a lower feed conversion ratio (FCR).
2.2 Contribution of Formulation and Processing
Technical literature indicates that formulation and grinding account for approximately 60% of pellet quality, while the pelleting process itself contributes the remaining 40%. Within the pelleting process, three factors are machine-controllable:
- Conditioning: Steam temperature and retention time drive starch gelatinization, which is the primary binding mechanism in poultry feed.
- Die specification: Compression ratio, hole diameter, and surface finish determine pellet density and PDI.
- Cooling: Inadequate cooling renders pellets brittle, leading to post-pellet breakage.
3. Ring Die Hole-Making Technology: The Core of Pellet Quality
3.1 Design Parameters for Broiler Feed Ring Dies
| Parameter | Typical Range for Broiler Feed | Technical Rationale |
|———–|——————————-|———————|
| Hole diameter | 2.5–4.0 mm | Matches beak size and gizzard function of broilers |
| Compression ratio (L/D) | 1:4 to 1:11 | Balances pellet density and energy consumption |
| Target hardness | HRC 54–60 (post heat treatment) | Ensures wear resistance without brittleness |
| Material grade | X46Cr13 / 4Cr13 or 20MnCr5 / 20CrMnTi | High chromium stainless or alloy steel for corrosion and wear resistance |
3.2 Manufacturing Process and Hole Precision
The production of a high-precision ring die follows a sequential workflow, with deep-hole drilling being the most technically demanding stage.
1. Material selection and forging: High-purity alloy steel round bars are forged into ring blanks. Forging refines the grain structure and enhances toughness, which is critical for withstanding cyclic compressive loads during pelleting.
2. Rough and finish turning: CNC lathes machine the forging to precise inner and outer diameters.
3. Pre-drilling preparation: The die is centered, and auxiliary features (mounting holes, keyways) are machined.
4. Deep-hole drilling (core process): Thousands of holes are drilled through the thick ring. Modern manufacturers employ CNC deep-hole drilling machines using BTA or gun drilling tooling. These methods deliver high-pressure coolant through the drill shank to flush chips continuously, ensuring hole straightness and a smooth internal surface.
5. Counterboring (relief grooving): The entrance of each hole is enlarged with a conical or stepped relief. This reduces friction and die pressure, allowing soft broiler feed to extrude smoothly and extending die service life.
6. Heat treatment: The die undergoes normalizing, tempering, and vacuum quenching. Vacuum quenching is particularly important for stainless-steel dies to prevent oxidation and maintain a clean internal surface. The target is uniform hardness of HRC 54–60 with minimal distortion.
7. Final machining and polishing: Post-heat-treatment, the die bore and faces are finish-ground. Optional CNC polishing of counterbores further reduces friction.
8. Quality control: Each die is inspected for dimensional accuracy, hardness uniformity, and surface finish before packaging.
3.3 Impact of Hole Surface Finish on PDI
A rough or pitted hole surface increases friction between the feed mash and the die wall, leading to:
- Higher specific energy consumption (kWh/ton)
- Increased fine generation during pelleting
- Non-uniform pellet density
Conversely, a smooth, precisely drilled hole reduces frictional heat, improves pellet release, and contributes to a higher PDI. For Belarusian feed mills operating in a cold-climate logistics environment, high PDI is especially valuable because pellets must withstand additional handling and transport stress without excessive breakage.
4. Manufacturer Case: Technical and Service Approach of Hongyang Feed Machinery
Liyang Hongyang Feed Machinery Co., Ltd. (hereinafter “Hongyang”) was established in 2006 and specializes in the R&D and production of ring dies, flat dies, pellet mills, hammer mills, and mixers. Unlike general-purpose machinery suppliers, Hongyang’s core competence lies in the manufacture of high-precision ring dies and rollers for a wide range of applications, including poultry and livestock feed, aquatic feed, pet food, and biomass pellets.
4.1 Technical Capabilities Relevant to the Belarusian Market
- Material and heat treatment: Hongyang uses high-grade stainless steel (e.g., X46Cr13) and applies vacuum quenching to achieve uniform hardness and extended service life. For Belarusian clients, this translates to fewer die changes per production season and more consistent pellet quality.
- CNC deep-hole drilling: The company employs CNC ring die drilling machines capable of producing smooth, precisely positioned holes. This capability directly supports the high PDI requirements of modern broiler feed formulations.
- Customization: Hongyang designs dies with specific compression ratios and hole patterns tailored to the client’s raw material profile. For Belarusian feed mills that often use a mix of local grains (wheat, barley) and imported soybean meal, this customization is technically significant.
- Quality documentation: Each die is supplied with material certification and hardness test reports, which facilitate the client’s compliance with EAEU technical regulations (TR CU 010/2011 for mechanical safety, TR CU 004/2011 for electrical safety).
4.2 Export Experience and EAEU Market Adaptation
Hongyang’s equipment has been exported to Russia, Vietnam, the Philippines, Indonesia, Thailand, Malaysia, Bangladesh, India, Pakistan, Syria, Iran, Egypt, Oman, and Senegal. This geographic spread demonstrates the company’s ability to manage international logistics, documentation, and diverse certification requirements.
For the Belarusian market specifically, the following adaptations are relevant:
- Certification support: Hongyang provides technical documentation to support the client’s application for GOST-B certification (the EAEU conformity mark required for machinery import).
- Logistics: Heavy equipment such as ring die pellet mills is typically shipped via containerized rail using the China–Europe Railway Express, with Minsk as a primary destination. Hongyang has experience in preparing equipment for long-distance rail transport, including anti-corrosion packaging and shock-proof crating.
- After-sales service: Hongyang dispatches engineers for on-site installation, commissioning, and operator training. For Belarusian clients, this service model reduces the risk associated with importing specialized machinery from overseas.
4.3 A Representative Equipment Configuration
While specific Belarusian client references are not publicly disclosed, a typical configuration for a Belarusian feed mill seeking to produce 5–10 t/h of broiler feed might include:
- One SZLH420 or SZLH508 ring die pellet mill, equipped with a high-precision gear drive and a stainless-steel ring die (hole diameter 3.0–3.5 mm, compression ratio matched to local formulation).
- Supporting equipment: hammer mill, batch mixer, conditioners, counter-flow cooler, and vibrating sieve.
- Expected outcome: stable production at target capacity, PDI ≥ 92%, and die service life comparable to mid-to-high-end international benchmarks.
5. Discussion: Evaluating Ring Die Quality for Belarusian Feed Mills
When evaluating a ring die pellet mill or replacement ring dies, Belarusian feed mill managers should consider the following technical and commercial factors:
1. Specify raw material details: Provide the supplier with a representative formula (ingredient list, particle size distribution) so that the compression ratio and hole pattern can be correctly designed.
2. Request material certification: Ask for mill test reports and hardness maps. A reputable supplier will provide these without hesitation.
3. Verify hole drilling method: CNC deep-hole drilling with high-pressure coolant is the current industry benchmark. Gun drilling or BTA drilling should be explicitly confirmed.
4. Check EAEU compliance documentation: Ensure the supplier can provide a draft EAC declaration and technical passport in Russian or English.
5. Assess after-sales responsiveness: For Belarus, spare parts delivery times and the availability of remote technical support are critical operational factors.
6. Conclusion
The purchase of a ring die pellet mill for broiler feed production in Belarus is a technically and commercially significant decision. The hole-drilling precision of the ring die is a key determinant of pellet durability (PDI) and, by extension, broiler growth performance and feed cost efficiency. Manufacturers that combine advanced CNC deep-hole drilling, controlled heat treatment, and application-specific customization—such as Liyang Hongyang Feed Machinery Co., Ltd.—are well positioned to serve the Belarusian market’s evolving needs.
For Belarusian feed millers, the path to high-quality broiler feed pellets begins with a technically rigorous evaluation of the ring die. By focusing on measurable parameters—hole surface finish, compression ratio accuracy, material certification, and supplier after-sales capability—mills can make procurement decisions that deliver measurable returns in pellet quality and operational reliability.
References
1. EAEU Technical Regulations (TR CU 010/2011, TR CU 004/2011, TR CU 020/2011, TR EEU 048/2019).
2. China–Eurasian Economic Union Economic and Trade Cooperation Agreement (preferential tariff provisions).
3. Pellet Durability Index (PDI) measurement procedures (Pfost and Holmen tester methodologies).
4. Ring die manufacturing technical literature: CNC deep-hole drilling, BTA and gun drilling applications in feed machinery.
5. Liyang Hongyang Feed Machinery Co., Ltd. corporate technical documentation and product specifications.
6. HS Code 8436.10 – Machinery for the food or drink industries (feed processing machinery classification).
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Post time: May-27-2026
