Powder coating · Powder booths · Curing ovens
Powder coating systems. From pretreatment to the oven.
SAPI designs and builds industrial powder coating systems: pretreatment, powder booth with recovery, curing oven and conveyor technology, as individual components or as a complete line.
- Complete lineFrom pretreatment to curing oven
- Automatic + manualPowder application as required
- CyclonePowder recovery with after-filter
- Since 1970Plant engineering from Möttingen
How it works
How a powder coating system works
The workpieces hang on the overhead conveyor and pass through pretreatment, powder booth and curing oven one after the other. Choose a powder colour and application mode, then click the numbers to see the assemblies.
- Pretreatment (rinse water)
- Powder
- Exhaust air (filtered)
- Oven heat (recirculated air)
Simplified illustration: Images and illustrations may differ from actual projects. The animation is a simplified, schematic representation of the working principle.
Automatic guns on reciprocators coat the parts from both sides. The powder is electrostatically charged and adheres evenly. Powder that misses the workpiece is extracted, separated in the cyclone and reused.
The parts then move into the curing oven, where the powder melts, flows out and cures into a hard, uniform surface.
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The conveyor carries the workpieces through the system in a loop. At the loading and unloading station they are hung up and, after cooling, taken down.
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Cleaning, degreasing and rinsing in the spray tunnel. A clean surface is the basis for good adhesion and durability of the coating.
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Automatic guns on reciprocators or manual guns apply the electrostatically charged powder. The booth keeps the application clean and even.
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Excess powder is extracted, separated in the cyclone and fed back to the gun via the powder centre. An after-filter cleans the exhaust air.
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Recirculating air oven with burner: the powder melts, flows out and cures into a durable surface.
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Control cabinet with gun control units. This is where powder application, reciprocators, oven and conveyor are set.
Components
What makes up a SAPI powder coating system
We supply individual components or the complete line, tailored to your workpieces and production volumes.
Powder booth
Provides a clean environment for application and ensures an even distribution of the powder.
Powder guns
Manual and automatic guns apply the electrostatically charged powder to the workpiece.
Powder supply
Hoppers, powder pumps, hoses and sieves convey the powder from the supply to the gun.
Pretreatment
Cleaning, degreasing, rinsing and surface treatment for good adhesion and durability.
Curing oven
Heats the coated parts so that the powder melts, flows out and cures into a durable surface.
Burner and exhaust
Burners, recirculation fans and flue gas ducting supply the oven with heat and safely remove fumes.
Conveyor technology
The overhead conveyor moves the parts evenly from pretreatment through the booth into the oven.
Controls
Control cabinet with gun control units for reproducible results.
Construction
One line, tailored to your parts
Powder booth and recovery
Applying and recovering powder
In the powder booth, automatic guns on reciprocators coat the workpieces from both sides, while manual guns take care of difficult areas. Excess powder is extracted, separated in the cyclone and reused via the sieve and powder centre. An after-filter cleans the exhaust air.
- Automatic guns on reciprocators
- Manual guns for touch-up coating
- Cyclone with after-filter and powder return
Curing oven
Even heat for a perfect surface
In the recirculating air oven, the powder is melted and cured. We design burners, recirculation fans and exhaust stacks to suit the oven size, throughput time and your energy supply. Entry and exit openings are adapted to the workpiece contour.
- Recirculating air oven with burner
- Exhaust routing through stainless steel stacks
- Openings matched to the workpiece contour
Conveyor technology
Everything in one continuous line
The overhead conveyor links loading and unloading, pretreatment, powder booth and curing oven in a single loop. On request, we add a SAPI blast hall upstream so that the parts enter the coating process perfectly prepared.
- Overhead conveyor in a loop
- Throughput times based on your volumes
- Can be combined with blast hall and paint system
Process
Five steps to a powder coated surface
Powder coating is a dry process: a fine powder of resin, pigments and additives is applied electrostatically and cured in the oven.
- 01
Hanging
The workpieces are hung on the overhead conveyor and earthed.
- 02
Pretreating
Oils, dirt and other contaminants are removed by cleaning, degreasing and rinsing.
- 03
Coating
The powder is electrostatically charged and adheres evenly to the surface.
- 04
Curing
In the oven, the powder melts, flows out and cures into a hard coating.
- 05
Cooling and unloading
After cooling, the parts are immediately ready for assembly or shipping.
- 06
Optional: blasting beforehand
For steel parts with rust or mill scale, a blast hall ahead of the line ensures the best adhesion.
Powder coating or wet paint?
| Powder coating | Wet painting | |
|---|---|---|
| Solvents | Solvent-free powder | Solvent-based or water-based, depending on the paint system |
| Overspray | Recovered and reused | Separated, not reusable |
| Curing | In the curing oven | Air drying or in the drying booth |
| Workpieces | Mainly metal parts that can withstand the oven temperature | Almost any material, including very large components |
| Ideal for | Series production, profiles, sheet metal and frames | Large steel structures and special coatings |
Gallery
Powder coating systems by SAPI
Completed systems and details. Click to enlarge.
Videos
Powder coating in action
Why SAPI
Why you should plan your powder coating system with SAPI
- 01
Single source
Pretreatment, booth, recovery, oven, conveyor technology and controls from one plant manufacturer.
- 02
Made to measure
Line, oven size and throughput time matched to your workpieces and volumes.
- 03
Cost-effective
Powder recovery and a recirculating air oven reduce material and energy consumption.
- 04
Clean and safe
Extraction and filtration keep powder particles out of the air and protect your staff.
- 05
Combines with blasting technology
Blast hall, powder line and paint system from a single plan.
- 06
Service
Planning, installation, commissioning and support with maintenance and optimisation.
Frequently asked questions
Questions about powder coating systems
What is powder coating?
A dry coating process: a fine powder of resin, pigments and additives is applied electrostatically to the workpiece and then cured in the oven. The result is a protective and decorative surface.
What does a powder coating system consist of?
Typical elements are pretreatment, a powder booth with guns and powder supply, recovery with cyclone and filter, a curing oven, conveyor technology and controls. We supply individual components or the complete line.
Why is pretreatment so important?
Oils, dirt and other contaminants prevent the powder from bonding firmly to the substrate. Cleaning, degreasing and rinsing ensure good adhesion and long durability.
How does powder recovery work?
Powder that does not adhere to the workpiece is extracted from the booth and separated in the cyclone. It passes through a sieve back into the powder centre and is reused. An after-filter cleans the exhaust air.
Automatic or manual coating?
Automatic guns on reciprocators are suited to series production and uniform parts. Manual guns are ideal for small batches, complex geometries or touch-up coating. Many systems combine both.
Which workpieces can be powder coated?
Mainly metal parts such as steel and aluminium, for example profiles, sheet metal, housings and frames. The parts must withstand the curing temperature. We design the system around your workpieces.
At what temperature is the powder cured?
That depends on the powder coating; the specifications come from the powder manufacturer. We design the oven so that temperature and dwell time match your powders and throughput times.
Can I blast before powder coating?
Yes. Especially for steel parts with rust or mill scale, blasting is the best preparation. On request, SAPI plans the blast hall and powder line together.
How much space does a powder coating system need?
That depends on workpiece size, volumes and oven length. Send us your hall layout, workpiece dimensions and required output, and we will propose a suitable layout.
How much does a powder coating system cost?
The price depends on line length, pretreatment, booth, oven and conveyor technology. Send us workpiece dimensions, weights and volumes, and we will prepare an individual quotation.
Your contact
Plan your powder coating system with us
Send us workpiece dimensions, weights, volumes and your hall layout. We will get back to you with a proposal.
Friedrich Fischer · Large systems – international
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