Combined Paint and Drying Booths
A combined booth is a system in which painting and drying take place in the same volume. The part is positioned once; painting, flash-off and curing are completed in place. It requires less space than separate booth and oven, and removes the surface defects that arise while moving the part.
Where it is the right choice
A combined solution does not suit every plant; part size and cycle volume are decisive. The booth is occupied not for the painting time but for the duration of painting + flash-off + curing . It therefore creates a bottleneck in high-volume series production.
By contrast it is clearly superior for large-bodied, low and medium volume production with a wide product range: commercial vehicles and buses, agricultural and construction machinery, defence vehicles, rail vehicles and large steel structures. For such products, moving the part to an oven is in itself a cost and a damage risk.
Ventilation runs in two distinct regimes
The real engineering topic of a combined booth is ventilation, because one volume performs two different jobs. The painting regime needs high-volume filtered fresh air and downward flow, to sweep away paint mist and prevent dust settling. The curing regime throttles fresh air, recirculates and heats it, to hold temperature and avoid wasting energy.
The transition is managed by dampers, fan speeds and burner control. Automating this transition is what determines the booth’s real performance; in manually managed systems the temperature ramp is not held and curing remains incomplete.
The structure must be both booth and oven
A combined booth brings paint-booth-grade filtration and oven-grade insulation together in one structure. Panel insulation is selected for the curing temperature; lighting, seals and filter housings are made of materials that will not deform permanently at that temperature. Adding heating later to a structure designed only as a paint booth does not work.
Safety: the purge cycle is not negotiable
Switching to heating while solvent vapour is present in the booth carries an explosion risk. Before curing there is therefore a mandatory purge cycle : the booth air is completely replaced before the burner starts. Duration and flow are calculated from booth volume and solvent load and are interlocked in the control system — the operator cannot skip it.
This interlock is also a fundamental requirement of the relevant equipment standards. Purge time and lower explosion limit measurements are recorded during commissioning.
Related topics
- Paint Booths
- Industrial Ovens
- PLC Automation and Electrical
- Defence Industry
- Agricultural and construction machinery
Let’s arrange a preliminary technical discussion for a combined booth. Share your part dimensions, daily volume, paint system and target curing regime, and our process engineer will assess — with reasons — whether a combined or separate arrangement is right.