Sanyuantang provides powder coating screening equipment for finished coating powders, reclaimed powders, pigments, resins, and mineral fillers. Our vibrating sifters, ultrasonic screening machines, and powder handling equipment are used to remove oversized particles, separate agglomerates, and transfer materials between production stages.
We supply standalone screening machines and customized feeding and conveying arrangements for powder coating manufacturing and recovery lines. Equipment selection is based on the required mesh size, processing capacity, powder properties, and available installation space.
On this page: Materials · Applications · Screening problems · Equipment · Process systems · Liquid filtration · Selection · FAQs
Paint & Coating Materials We Process
Paint and coating materials vary in particle size, flowability, moisture content, and screening requirements. Sanyuantang provides screening and filtration equipment for powder coatings, pigments, resins, mineral fillers, and liquid coatings. We select suitable equipment according to the material properties and processing stage.
Powder Coatings
Epoxy, polyester, epoxy-polyester hybrid, polyurethane, and acrylic powder coatings are commonly screened after grinding. Screening removes coarse particles, agglomerates, and unwanted material before the powder is collected or packaged.
Reclaimed Coating Powders
Powder recovered from spray booths may contain fibers, dust, coarse particles, and agglomerates. Screening removes these contaminants before the recovered material is evaluated for reuse or blending with virgin powder.
Pigments & Color Powders
Organic pigments, inorganic pigments, and fine color powders may cling to the mesh or form soft agglomerates. Fine screening removes oversized material before blending or packaging. For powders that repeatedly block the screen, ultrasonic assistance can improve mesh passage.
Powder Resins & Additives
Epoxy resin powders, polyester resins, flow agents, matting agents, and other coating additives may require screening before mixing. The main purpose is to remove lumps and oversized material that could affect feeding or blending.
Mineral Fillers
Calcium carbonate, talc, silica, mica, and barite are commonly used in coating formulations. Screening removes coarse particles and unwanted material before these fillers enter the mixing process.
Liquid Paints & Coating Slurries
Liquid paints, resin liquids, and coating slurries may contain undispersed particles, agglomerates, or foreign material after mixing. Vibrating filtration equipment can remove coarse solids before storage, further processing, or filling.
Powder Coating Screening Applications
Powder coating screening is mainly used to remove oversized particles, agglomerates, and impurities after grinding or during powder recovery. Screen mesh and equipment configuration are selected according to the material properties, required processing capacity, and production stage.
Final Powder Coating Screening
After extrusion, cooling, and grinding, finished powder coatings may contain oversized particles and agglomerates. A vibrating screen separates these materials from the usable powder before final collection and packaging.
A typical process is:
Grinding → Screening → Powder Collection → Packaging
Rotary vibrating screens and inline sifters are commonly considered for this duty. The machine should provide sufficient screening area for the production rate without excessive powder buildup on the screen.
We configure the screen mesh, feed inlet, discharge outlets, and connection arrangement according to the grinding and collection equipment.
Reclaimed Powder Coating Screening
Powder collected from spray booths often needs screening before it can be returned to the coating process. Fibers, dust, agglomerates, and other oversized contaminants may enter the recovered material during spraying and collection.
Screens around 60, 80, or 100 mesh are used in some powder recovery applications. The correct opening depends on the coating powder and the recovery system.
A typical process is:
Powder Recovery → Sieving → Collection → Quality Check → Reuse
Sanyuantang can configure compact vibrating sifters for reclaimed powder handling, with suitable feed and discharge connections for the existing recovery system.
Pigment & Fine Powder Screening
Fine pigments and coating powders may be difficult to process through small screen openings. Static electricity, particle adhesion, and agglomeration can cause mesh blinding and reduce screening capacity.
Our ultrasonic vibrating screen adds high-frequency vibration to the mesh, helping fine powders pass through more consistently.
For pigment screening, we check the target mesh size, particle distribution, bulk density, powder flow, and required throughput before selecting a machine.
Resin, Filler & Additive Screening
Resin powders, mineral fillers, and coating additives may contain lumps or oversized particles after storage and transportation. Screening before mixing helps remove these materials and provides a more consistent feed to downstream equipment.
Rotary vibrating screens are suitable for many general powder applications. For higher-volume processing, feeding and discharge arrangements should be selected together with the machine size.
Common Powder Coating Screening Problems
Fine powder coatings can be difficult to screen because of static electricity, particle adhesion, and uneven feeding. These problems can cause mesh blockage, reduce screening capacity, and affect the quality of finished or reclaimed powder.
Screening Equipment for Powder Coatings & Pigments
Sanyuantang supplies vibrating screening machines for different coating materials and production capacities. Our equipment can be configured with suitable screen meshes, contact materials, feeding connections, and discharge arrangements.
Rotary Vibrating Screen
Our rotary vibrating screen uses three-dimensional vibration to separate powder through a circular screen. It is suitable for general powder coating screening, resin powder sieving, mineral filler separation, and reclaimed powder check screening.
Single or multiple screen decks can be configured for impurity removal and particle size separation.
Ultrasonic Vibrating Screen
Our ultrasonic vibrating screen combines rotary vibration with a high-frequency ultrasonic mesh-cleaning system. It is designed for fine powders that are prone to adhesion, static electricity, or screen blockage.
Screen diameters and stainless steel contact components are selected according to the powder and installation requirements.
Rotary Airflow Sifter
A rotary airflow sifter uses internal airflow and mechanical movement to separate fine powder through a cylindrical screen. It can be considered for selected lightweight powders and materials containing soft agglomerates.
WQS-series airflow sifters can be selected according to powder characteristics, target particle size and required throughput.
Inline Sifter
An inline sifter provides check screening in a compact installation. Its low-profile arrangement allows it to be connected beneath feeding equipment or integrated with powder collection and discharge systems.
Selection Guide
| Equipment | Screening Range | Reference Capacity | Typical Duty |
|---|---|---|---|
| Rotary vibrating screen | 3–500 mesh, model dependent | 100–2,000 kg/h for listed standard models | Powder coating check screening, oversize removal and classification |
| Ultrasonic vibrating screen | 10–635 mesh | 50–3,500 kg/h | Fine pigments and powders prone to mesh blinding |
| Rotary airflow sifter | 5–500 mesh | 100–5,000 kg/h | Selected lightweight powders and soft agglomerates |
| Inline sifter | Selected for the material and configuration | Confirmed from screen size, aperture and feed conditions | Compact continuous check screening and reclaimed powder handling |
All listed capacities are equipment series reference values, not guaranteed powder coating production rates. Actual throughput depends on powder properties, mesh size, and operating conditions.
Material Screening Test Video
Powder Coating Screening & Conveying Systems
Powder coating manufacturing involves several connected operations, including premixing, extrusion, grinding, screening, and packaging. Proper equipment connections help maintain steady material flow and reduce repeated manual handling.
Sanyuantang supplies screening, feeding, and conveying equipment that can be integrated with existing production machinery.
Powder Coating Production Screening Line
A thermoset powder coating production process follows these stages:
Upstream Preparation
Premix the raw materials, then carry out melt extrusion and cooling in the upstream production equipment.
Grinding
Reduce the cooled material to the required powder size before screening.
Screening
Use Sanyuantang screening equipment to remove oversized particles and agglomerates after grinding.
Collection and Packaging
Direct accepted powder to collection and packaging equipment through suitable discharge connections.
The vibrating screen is usually installed after grinding to remove oversized particles before the powder enters the collection or packaging stage.
We select the screen diameter, inlet and outlet dimensions, and feeding arrangement to match the grinding system’s production rate. Enclosed connections can be used to reduce powder escape during transfer.
Reclaimed Powder Screening System
Recovered powder can be delivered from the spray booth recovery equipment to a vibrating sifter for impurity removal.
Recovered Powder → Screening → Powder Collection → Quality Check → Reuse
The screening machine removes oversized contaminants, while the collection hopper or connected conveyor directs accepted powder to the next stage.
We can customize the screen opening, collection arrangement, and connection dimensions according to the customer’s recovery equipment.
Powder Feeding & Vacuum Conveying
Screw feeders, feed hoppers, and vacuum conveyors can be connected to screening equipment where continuous material transfer is required.
A screw feeder provides controlled powder delivery to the screen, while a vacuum conveying system can transfer material between enclosed processing stages.
Sanyuantang reviews the powder bulk density, feeding rate, conveying distance, and installation layout when selecting suitable supporting equipment.
Liquid Paint & Coating Filtration
Liquid paints, resin liquids, and coating slurries may contain coarse particles, undispersed solids, or foreign material after mixing. Vibrating filtration equipment separates these unwanted materials before storage, further processing, or filling.
A typical filtration arrangement is:
Mixing → Vibrating Filtration → Holding Tank → Filling
Unlike dry powder screening, liquid filtration capacity is strongly affected by viscosity, solids content, and screen opening. A high-viscosity coating may require a larger filtration area or a different filtration method to achieve the required flow rate.
Sanyuantang can review liquid material properties, filtration accuracy, required flow rate, and contact material requirements to determine a suitable vibrating filtration arrangement.
How to Choose a Powder Coating Sieving Machine?
Selecting a powder coating sieving machine starts with the material, required separation, and production capacity. Two coating powders may use the same mesh opening but have very different screening rates because of static electricity, bulk density, or particle adhesion.
We review the following parameters before recommending equipment.
| Selection Factor | Information Required |
|---|---|
| Material | Powder coating, reclaimed powder, pigment, resin, or filler |
| Screening purpose | Oversize removal, check screening, classification, or recovery |
| Mesh size | Required mesh number or aperture in microns |
| Production capacity | Required kg/h |
| Powder properties | Bulk density, flowability, moisture, static, and adhesion |
| Equipment material | Carbon steel, 304 or 316 stainless steel |
| Feeding method | Manual loading, screw feeder, or enclosed conveying |
| Installation | Available space and connected processing equipment |
For general coating powder screening, a rotary vibrating screen is often a practical starting point. For fine powders that repeatedly block the mesh, ultrasonic screening may be more suitable. Where compact installation is important, an inline sifter can be considered.
For powder coating materials that may create a combustible dust atmosphere, electrical equipment, grounding, dust containment, and explosion protection also need to be evaluated for the installation.
We can arrange material screening tests to check mesh passage, screen blinding, and achievable throughput before confirming the machine size.
Custom Powder Coating Screening Solutions from Sanyuantang
Sanyuantang manufactures screening and powder handling equipment for coating, chemical, and industrial powder processing applications. We supply individual machines and customized equipment arrangements for production and recovery lines.
Our engineering support covers four main areas.
Material Screening Tests
We evaluate powder behavior, target mesh size, and required capacity to help select a suitable screening machine. Testing is especially useful for fine pigments, electrostatic powders, and materials that tend to block the screen.
Custom Screening Equipment
We offer different screen diameters, screening layers, contact materials, inlet and outlet designs, and supporting structures. Ultrasonic systems can also be considered for suitable fine powder applications.
Feeding & Conveying Integration
Our screening machines can be connected with feed hoppers, screw feeders, vacuum conveyors, and powder collection equipment to reduce manual transfer and improve material flow.
Production Line Layout Support
We review available installation space, equipment dimensions, processing capacity, and upstream and downstream connections when planning a screening section for an existing coating production line.
Share your powder type, required mesh size, hourly capacity, and process layout with our team. We can help select a suitable screening machine and equipment configuration.
Project Review
Request a Powder Coating Screening Solution
Send your powder type, target mesh or aperture, hourly capacity and process layout. Our team can review the screen, feeding method, conveying connections and installation requirements.
Standalone sifters and connected screening systems
Powder Coating Screening FAQs
What type of vibrating screen is used for powder coating?
Rotary vibrating screens and inline sifters are commonly used for powder coating check screening and oversized-particle removal. Ultrasonic vibrating screens are suitable for fine powders that repeatedly clog the mesh. The best choice depends on the coating formulation, required mesh size, screening capacity, and installation conditions. Sanyuantang can recommend a configuration based on these requirements.
What mesh size is suitable for powder coating screening?
The required mesh size depends on the coating powder specification and the purpose of screening. Some reclaimed powder applications use 60, 80, or 100 mesh screens to remove oversized contaminants. Final product screening may require a different aperture. The mesh should be selected according to the actual particle size requirement rather than using a fixed value for all powders.
How do you screen reclaimed powder coating before reuse?
Recovered powder is passed through a vibrating sifter to remove fibers, coarse particles, and agglomerates collected during the spraying process. The screened material is then collected for quality assessment before reuse or blending with virgin powder. Sanyuantang can configure the screening machine with suitable collection and conveying connections for the customer’s powder recovery system.
When should an ultrasonic vibrating screen be used for coating powders?
Ultrasonic screening is useful when fine coating powders or pigments repeatedly block the mesh under normal vibration. The ultrasonic system applies high-frequency vibration to the screen surface, helping reduce particle adhesion and maintain powder passage. It is especially worth evaluating for electrostatic or cohesive powders. Material testing helps determine whether ultrasonic assistance is needed.
What is the difference between a vibro sifter and an airflow sifter?
A vibro sifter uses mechanical vibration to move powder across a circular screen and is suitable for general screening and particle classification. An airflow sifter uses air movement to assist powder separation through a cylindrical screen. Airflow screening may be suitable for selected lightweight or fine materials, while vibrating screens offer flexible screen configurations for many routine applications.
Can Sanyuantang customize a powder coating screening and conveying system?
Yes. Sanyuantang can customize vibrating screens, ultrasonic screening equipment, feed hoppers, and conveying connections for powder coating production and recovery lines. We review the material type, screening mesh, required throughput, feeding conditions, and available installation space before recommending a solution. Customers can also provide powder samples or production line drawings for further evaluation.
Discuss Your Powder Screening Requirements
Send your material details, target particle size, required capacity and installation conditions using the enquiry form below.