Indirect gas heated tunnel oven
- Separate burners for top and bottom heat
With separate burners for top and bottom heat in each zone the oven becomes very flexible and gets a very fast reaction time when adjusted for new products.
- Flexible adjustment
Each zone is working independently since the temperature is set with individual temperature regulators in the same way as an electric oven. There is no need to adjust the temperature with dampers as on a traditional oven because the oven is set up at installation and there after everything is controlled with the control panel.
- Energy efficiency
The oven is very energy efficient; the burners adapt their heat output to the demand from each zone.
When a burner fails in a “standard” oven with just one burner, then the entire oven shuts down. In the Sveba-Dahlen oven only the top or bottom heat of one zone fails.
- Easy to service and maintain
All components and functions such as fans, burners, electrical cabinet, motors and drives are easy to access, inspect and to service
Electrically Heated Tunnel Oven
- Materials and components
We manufacture the exterior of the oven in stainless steel. The materials in the oven chamber are specifically selected for each oven, for the baking temperature and the product range. All the ovens are insulated with rockwool to minimize the heat loss.
The electric tunnel ovens are heated by tube elements with double heating spirals. The elements are installed over and under the oven chamber, along the entire oven, and are easily accessible from the side. Each element has its heat-emitting part positioned so that the band is heated efficiently over its full width. The tube elements are specially manufactured for each individual oven for maximum control of the heat distribution and quality. On an average, a tunnel oven consists of about 12 elements per meter.
The control panel is designed to give best overview and simple control displaying baking time, temperature etc. PLC control with recipe handling of process parameters and handling of alarms and data logging is available as option. Connection to a master control system is another possible choice.
- Steam system
In ovens built for connection to a steam generator, a part of the first oven chamber is provided with steam spreader boxes made of acid proof stainless steel. Regulating indicator valves with dial clocks are fixed on the sides of the oven to set the correct volume. Steam control with quantity control/photocell control can be selected as an option.
- Air turbulence
For many types of products, it is appropriate to use a combination of radiant heat and air circulation. If so the oven can be equipped with turbo zones. In wire mesh band ovens, air circulation is most often vertical, up through the band, in steel band ovens it is horizontal along the band. With air circulation, the baking time can be shortened, and lower temperatures utilized. This also gives the sides of the bread better color, especially by baking with tins. By controlling the speed of the drive motor, optimal turbo power of the turbo fans can be obtained