Over 10,000+ customers' choice, Focus on screening industry 40+ years
Powder does not remain stationary inside screening equipment. Particles move under the influence of airflow, mechanical movement, and material feeding conditions. Different operating conditions may affect the physical state of the powder.
Particle Collisions: Potential Effects on Particle Integrity
As powder moves through the equipment, particles may collide with one another or with internal contact surfaces. For certain brittle materials or specially formulated powders, the intensity and frequency of these collisions should be considered.
Friction: Possible Changes in Fine Particle Content
Continuous friction between particles may cause surface abrasion. Some fragile particles may also break under certain operating conditions, potentially changing the proportion of fine particles. For this reason, particle movement and mechanical interaction should be evaluated when selecting screening equipment.
Agglomeration: An Important Factor in Screening Performance
PVC powder may form agglomerates due to static electricity, moisture, or interparticle forces. The degree to which these agglomerates disperse during screening can affect the particle condition presented to the screen mesh and influence the resulting particle size distribution.
Operating Parameters: Influencing Material Movement
Airflow conditions, feed rate, material residence time, and equipment configuration all influence how particles move inside the machine. Improper parameter settings may contribute to excessive particle interaction, localized material accumulation, or inconsistent screening.
Preserving powder characteristics does not simply mean reducing equipment operating intensity. Instead, it requires a suitable balance between powder dispersion, screening performance, and particle integrity.
A PVC centrifugal sifter combines airflow with mechanical movement to disperse powder within the screening area before separating particles through the screen mesh.
Unlike conventional vibratory screening equipment, which primarily relies on mechanical vibration to move material across the screen surface, a centrifugal sifter uses a different material-handling approach.
Its main application features include:
Airflow-Assisted Dispersion for Improved Powder Movement
During operation, appropriately controlled airflow helps disperse powder and reduce localized accumulation. This can provide fine particles with more favorable movement conditions.
For lightweight PVC powders and materials prone to agglomeration, airflow-assisted dispersion may help improve the distribution of material before and during screening.
Screen-Based Classification for Particle Size Control
After dispersion, the material passes through the screening area, where separation takes place according to the selected screen mesh specification.
Screen mesh selection can be matched to the incoming particle size distribution and the required product size range, supporting classification applications involving PVC resin powder and modified PVC powders.
Parameter Adjustment to Consider Particle Integrity
Airflow conditions, feeding speed, and screen mesh specifications can be evaluated together to adjust material movement inside the equipment.
Appropriate settings may help reduce unnecessary material accumulation and excessive mechanical interaction under suitable operating conditions.
It is important to note that airflow-assisted dispersion does not mean particles are completely free from collisions or breakage. For brittle powders or materials particularly sensitive to changes in fine particle content, actual material trials and before-and-after particle size analysis are recommended to evaluate equipment suitability.
PVC powders vary in particle shape, formulation, flowability, and processing requirements. Their suitability for different screening methods also depends on these characteristics.
| Material Type | Main Screening Considerations | Potential Process Focus |
| PVC resin powder | Particle size distribution, fine particle content, and agglomeration | Airflow-assisted dispersion and particle classification |
| Modified PVC powder | Formulation differences, particle condition, and size control | Matching screen mesh and airflow conditions to material properties |
| PVC functional additive powder | Fine particle content, adhesion, and dispersion | Evaluating the effectiveness of airflow-assisted dispersion |
| Other chemical resin powders | Particle integrity, flowability, and screening requirements | Selecting equipment based on material trials |
For powders that are particularly susceptible to abrasion or breakage, equipment selection should place sufficient emphasis on particle integrity rather than focusing exclusively on screening speed.
If the material is prone to strong static buildup, moisture-related agglomeration, or noticeable adhesion, static control measures, raw material conditioning, and operating environment should also be considered.
Gentle screening performance cannot be determined by the equipment name or operating principle alone. Actual applications require practical evaluation.
During equipment testing and selection, manufacturers can compare several key indicators.
1. Compare Particle Size Distribution Before and After Screening
Analyze the particle size distribution of the incoming material and screened product. Pay particular attention to the target particle size range, oversized particle content, and fine particle proportion.
2. Examine Changes in Particle Integrity
For PVC powders sensitive to breakage, inspect particle morphology before and after screening according to the material's characteristics. This helps evaluate whether noticeable particle breakage or abrasion occurs during processing.
3. Monitor Powder Dispersion and Screening Stability
Observe whether the material experiences localized accumulation, significant agglomeration, or fluctuations in screening performance. These conditions should be evaluated alongside feed rate and airflow settings.
4. Verify Equipment Parameters Against Production Requirements
Conduct trials using different airflow conditions, feed rates, and screen mesh specifications. Compare the resulting screening performance and identify an appropriate combination of operating parameters for the intended application.
These evaluation methods provide a more objective basis for determining whether a PVC centrifugal sifter is suitable for a particular powder and whether its configuration meets production requirements.
In PVC manufacturing, screened powder typically moves on to subsequent processes such as batching, mixing, conveying, or further processing. If screening causes significant changes in particle size distribution, it may affect the consistency of raw material conditions required by downstream operations.
Therefore, screening equipment should be selected with the overall production line in mind.
Gaofu Machinery can evaluate PVC centrifugal sifter configurations according to the processing requirements of PVC resin powder, modified PVC powders, and other chemical powders. Relevant considerations include screen mesh specifications, airflow conditions, processing capacity, and supporting equipment structures.
For applications with greater sensitivity to particle integrity, material trials can be used to compare particle size distribution and particle condition before and after screening, providing a practical reference for equipment selection.
Powder screening is not only about particle classification. It also involves managing material conditions throughout the screening process.
For PVC resin powder and modified PVC materials, selecting an appropriate screening method and carefully adjusting airflow and feeding parameters can help meet particle size classification requirements while taking particle integrity into consideration.
Gaofu Machinery's PVC centrifugal sifter combines airflow-assisted dispersion with screen-based classification, offering a screening solution for lightweight PVC powders and other chemical powder applications.
Contact Gaofu Machinery and share your material characteristics, target particle size, and production requirements. Our team can help evaluate a suitable screening configuration for your application.
Chemical Industry Client Testimonials
Wanhua Chemical, Yuntianhua Group, Kingfa Science & Technology, Formosa Plastics Group, China Pingmei Shenma Group, Kemai Co., Ltd., Luxi Chemical, Liby Group, Oriental Yuhong, Davco, Chenming Group, Guanhao High-Tech
Kaifei Chemical, Sunsine Chemical, Weilin Co., Ltd., Xuyang Group, 3Trees, Maydos, Loyal Group (Kingpor Group), AkzoNobel, CSSC Hanguang, Haike Group, Nice Group, Taishan Fiberglass, Wanhua, Red Eagle, China XLX Fertiliser (Xinlianxin), CCtech Catalysis, China National Bluestar, Sakura Paint, ITANOS, Yanggu Huatai, Sennics, Longxing Chemical Group, Tunhe Co., Ltd., GHW International, Jianye Chemical, Finehope
Fortune 500 Client Testimonials
CNPC、CSCEC、Sinochem Holdings、CRCC、China Minmetals Corporation、CNOOC、CR、Sinopharm、CHN Energy、COFCO Corporation、Huawei Technologies、PowerChina、CITIC Group、Wuchan Zhongda Group、NORINCO、Chalco、CNBM、 Shaanxi Coal and Chemical Industry Group、Ansteel Group、CETC、CSSC、CASC、CEC、Jinchuan Group、CASIC、Conch Cement、CNNC、SPH、Shanxi Coking Coal Group、 Zhongtai Chemical、GPHL、DEC、Sinosteel Corporation、MCC、China National Salt Industry Chemical、China Baowu Steel Group、China Animal Husbandry Industry Co., Ltd.、CECEP
About Gaofu
Xinxiang Gaofu Machinery Co., Ltd. was founded back in the 1980s. With over 40 years of development, it has been certified as a National-level Specialized, Refined, Unique & Innovative Little Giant Enterprise, National Green Factory, National High-tech Enterprise, and National Intellectual Property Advantage Enterprise, and serves as the President Unit of China Vibration Screening Industry Association.
The company is accredited with the Henan Provincial Industrial Design Center, Henan Provincial Engineering Technology Research Center for Intelligent On-line Screening System, and Xinxiang Municipal Engineering Technology Research Center for Fine Screening.
Gaofu has obtained more than 500 patents including invention patents, utility model patents and design patents, been awarded the Science and Technology Achievement Prize issued by the Ministry of Industry and Information Technology of China, and participated in drafting and formulating 4 national standards.
Gaofu's product portfolio covers multiple series and hundreds of specifications, including vibrating screening equipment, conveying equipment, coal crushing equipment, filtration equipment and automatic material handling systems.
Core products include vibrating screens, screening machines, vibratory sifters, rotary vibrating screens, ultrasonic vibrating screens, linear vibrating screens, airflow screens, gyratory screens, roller screens, dewatering screens, bar screens, vacuum feeding machines, dust-free feeding stations, bulk bag feeding stations, feeding systems, automatic powder feeding systems, automatic slag-discharging filters, leaf filters, clay filters, toothed roll crushers, coal crushers and other machinery.
These products are widely applied in food, pharmaceutical, chemical, metallurgy, construction materials, mining, thermal power, environmental protection and many other industries, winning recognition and trust from over 10,000 clients worldwide.
Gaofu products enjoy strong sales across Greater China, and are exported to more than 100 countries and regions such as Russia, Canada, the United States, New Zealand, Japan, Brazil and South Africa.
Upholding the corporate mission of Improving material quality & efficiency to fully satisfy customer demands, Gaofu maintains long-term partnerships with clients to achieve win-win development.
At present, Gaofu is an official qualified supplier for numerous Fortune Global 500 enterprises, including CNPC, Sinopec, Sinochem Holdings, China Resources Group, Sinopharm Group, COFCO, China National Building Material, China Aerospace Science and Technology Corporation, Jinchuan Group and more.
Gaofu Machinery ranks No.1 in global sales volume of vibrating screens.
In May 2024, Frost & Sullivan, a world-renowned international consulting firm, issued a Market Position Verification Certificate confirming that Gaofu achieved the world's largest shipment volume of vibrating screens in the global market in 2023.
