Bakery Spiral Proofers
The Henry Group builds bakery spiral proofers in single or double configurations, sized to the line’s production rate. The spiral belt is USDA plastic belting with a high open area for airflow, and THG supplies the enclosure, ductwork and conditioning units, with a belt washing system available. A PLC in the main control panel controls the temperature.

Spiral Proofer Packages
THG supplies spiral proofers as complete packages: the spiral conveyor, an insulated stainless enclosure, the conditioning system, transfer conveyors and the control panel. Product rides a continuous belt through several stacked levels inside the conditioned enclosure.
- All-stainless spiral structure with a modular plastic belt
- Enclosure of tongue-and-groove stainless steel panels with 6-inch urethane insulation, gasketed joints, stainless camlocks and personnel doors
- Conditioning by humidity steam generators with air heating elements, and air circulation blowers
- Washdown incline and decline conveyors and vertical switches to bring product to the spiral infeed and away from its discharge
- NEMA 12 control panel with PLC, operator interface and variable-frequency drives
Belt Cleaning
A portable high-pressure washer can be supplied with the spiral. It runs foam, rinse and sanitize cycles, and can serve in-line belt-washing stations or be used with hoses and a sanitation wand to clean the processing area. Dedicated spiral belt washers that clean both sides of the belt are available as an option.
Common questions
What belt does the spiral use?
A modular plastic belt. The bakery spiral proofers use USDA plastic belting with a high open area for increased airflow.
How is the spiral kept at proofing conditions?
The spiral runs inside an insulated stainless enclosure. Humidity steam generators with air heating elements condition the air, and circulation blowers move it through the enclosure. Temperature is controlled by the PLC in the main control panel.
How does product get into and out of the spiral?
Washdown incline and decline conveyors and vertical switches connect the spiral infeed and discharge to the rest of the line.
How is the belt cleaned?
A portable high-pressure washer with foam, rinse and sanitize cycles can be supplied, and dedicated spiral belt washers are available on request.
Talk with THG about your equipment.
Share your product, the process and the equipment you need to connect.