Over 10,000+ customers' choice, Focus on screening industry 40+ years
In the quality management system of pet feed manufacturers, the test sieve is mainly used in the following two scenarios:
1. Incoming raw material quality inspection – securing the first line of defence
Pet feed raw materials come in many varieties, including corn, soybean meal, meat meal, fish meal, cereals, and tubers. The particle size composition and impurity content of different raw materials directly affect subsequent processes such as grinding, mixing, and extrusion. Before raw materials are accepted into storage, quality control personnel must sample each batch and screen it to confirm whether the particle size distribution meets purchase specifications, while also checking for foreign matter such as stones, twine, and metal filings. The test sieve provides standardised particle‑size analysis data, offering an objective basis for raw material acceptance.
2. Finished product outgoing sampling – guarding the final checkpoint
Pet feed (especially extruded kibble) has strict requirements for pellet size. Different pet species and life stages require different pellet sizes. Before finished products are packed, quality control personnel take samples from each batch and use the test sieve to analyse the pellet size distribution, confirming whether uniformity meets standards and whether broken pellets and fines content are within allowable limits. The test sieve results are an important basis for deciding whether a batch can be released for shipment.
Gaofu's multi‑layer test sieve achieves precise particle‑size analysis through stacked multiple sieve frames and standardised vibration screening.
Its working principle is: eccentric weights mounted at the top and bottom of the motor shaft convert the motor's rotary motion into a three‑dimensional compound motion (horizontal, vertical, and inclined), which is transmitted to the screen surfaces. Material on the screens undergoes tumbling, rotating, and bouncing motion. When used with multiple stacked standard test sieves, it can accurately determine the particle size distribution of granular and powdered materials.
In feed mill quality control applications, the multi‑layer test sieve offers the following features:
Simultaneous screening with multiple decks – one test, multiple size fractions. The test sieve allows multiple stacked standard test sieve frames to be mounted on the machine at once. A single screening operation yields the percentage distribution of material across several size fractions. For example, stacking 4 or 5 sieve frames with different mesh sizes provides data for coarse particles, on‑size pellets, fines, and ultra‑fines in one run. This "one run, multiple data sets" efficiency is particularly valuable in busy QC laboratories where rapid test reports are required.
High test accuracy and good data repeatability. The test sieve is equipped with an electronic timer that allows the same screening time to be set for identical materials, ensuring accurate sample analysis data with minimal error. The standardised operation ensures that test results are comparable across different batches and different operators – which is essential for establishing consistent raw material acceptance criteria and finished product release standards.
Compact size, suitable for laboratory environments. The test sieve is small, lightweight, and easy to move. It can be installed in multi‑layer configurations without occupying excessive bench space. For feed mill QC laboratories, this means more testing tasks can be completed within limited space.
Multiple voltage options to suit different laboratory conditions. Supports 220V and 380V motors to meet various site requirements.
Optional ultrasonic system for improved ultra‑fine powder testing accuracy. When equipped with an ultrasonic screening system, the unit offers automatic screen cleaning, improving screening efficiency and test accuracy. For particle‑size analysis of ultra‑fine powders such as pet food additives and flavourings, this configuration provides more precise analytical data.
Raw material receiving:
Particle‑size composition analysis of bulk raw materials like corn and soybean meal to confirm grinding fineness meets process requirements;
Contamination level testing of animal‑derived materials such as meat meal and fish meal to screen for foreign matter;
Quality comparison between different suppliers to support procurement decisions.
In‑process monitoring:
Spot checks of particle‑size distribution after the grinding stage to monitor grinder performance;
Uniformity verification after the mixing stage.
Finished product outgoing inspection:
Particle‑size distribution analysis of finished pellets to confirm uniformity;
Quantitative testing of broken pellet and fines content in finished products;
Quality consistency comparison across different production batches.
When choosing a multi‑layer test sieve for feed mill quality control, consider the following aspects:
| Evaluation Dimension | Key Points to Consider |
| Material types to be tested | Pelleted feed, powdered raw materials, ultra‑fine additives – different materials require different mesh combinations |
| Accuracy requirements | Standard configuration for routine QC; ultrasonic system recommended for ultra‑fine powder testing |
| Number of sieve decks needed | Choose based on the number of particle size fractions to be analysed |
| Laboratory space | The test sieve is compact, suitable for limited QC lab space |
| Timer function | Electronic timer ensures consistent test conditions across runs |
About Gaofu
Xinxiang Gaofu Machinery Co., Ltd. was originally founded in the 1980s. After more than 40 years of development, the company has become a "National Specialized and Sophisticated 'Little Giant' Enterprise", a "National Green Factory", a "National High-tech Enterprise", a "National Intellectual Property Advantage Enterprise", and the "President Unit of the Vibration Association". It also hosts the "Henan Provincial Industrial Design Center", the "Henan Provincial Engineering Technology Research Center for Intelligent Online Screening Systems", and the "Xinxiang Municipal Engineering Technology Research Center for Fine Screening". The company has been granted more than 500 invention, utility model and design patents, has received the "Science and Technology Achievement Award" issued by the Ministry of Industry and Information Technology, and has participated in drafting four "National Standards".
Gaofu's product portfolio covers several series and hundreds of varieties, including vibrating screening equipment, conveying equipment, coal crushing equipment, filtration equipment, and automated material handling systems. Its main products include vibrating screens, screening machines, vibrating sifters, rotary vibrating screens, ultrasonic vibrating screens, linear screens, air flow screens, gyratory screens, roller screens, dewatering screens, bar screens, vacuum feeders, dust-free feeding stations, ton bag feeding stations, feeding systems, automatic powder feeding systems, automatic slag discharge filters, leaf filters, clay filters, toothed roll crushers, coal crushers, and other equipment. These are widely used in many industries such as food, pharmaceuticals, chemicals, metallurgy, building materials, mining, thermal power, and environmental protection, earning the trust and praise of over 10,000 customers worldwide.
Gaofu products are not only popular in Greater China but are also exported to more than 100 countries and regions, including Russia, Canada, the United States, New Zealand, Japan, Brazil, South Africa, etc. The company adheres to its mission: "Enhance material quality and efficiency, meet customer needs", walking side by side with customers for harmonious and win-win cooperation. Today, Gaofu has become an approved supplier to many Fortune 500 companies, including CNPC, Sinopec, Sinochem Group, China Resources Group, Sinopharm Group, COFCO Group, China National Building Material Group, China Aerospace, and Jinchuan Group.
Gaofu Machinery – Global No.1 in Vibrating Screen Sales. In May 2024, Frost & Sullivan, an international authoritative advisory firm, based on its research on the global vibrating screen market and calculated according to global vibrating screen sales volume in 2023, issued a market position confirmation certificate to Gaofu Machinery.
