Gas Heated Tunnel Ovens
The Sveba Dahlen indirect fired gas tunnel oven offers a unique flexibility and capability for producing a wide variety of products. The oven is built on a concept where each zone has two Weishaupt™ gas burners heating the air and distributing it to the top and the bottom of the oven through heat exchangers.
- “Normal” temperature range up to 280°C (536F).
- Optional, temperature up to 340°C in Zone 1 - Bottom heat.
- Available belt widths: 2,1 (2,2*), 2,5 (2,6*) and 3,0 (3.1*) m (3,0m = 9,84ft).
- Oven length, designed by capacity. Modular design, add as many 2,2m (7,22ft) long sections as needed.
- Normal length of a heating zone: 6,6 m (14,44ft) (4,4 and 8,8 m is also available).
* Available for ovens shorter then 24m (78,74ft).
Features and Benefits
Heating
The tunnel ovens are heated by tube elements with double heating spirals. They are specially made for each oven to maximize the heat control and reliability of the elements. On average we use 12 elements per meter of oven. The elements, placed on the top of the oven chamber and below the belt, are easily accessed from the side.
Patented Heat Regulation
The Sveba Dahlen Gas / Oil Heated Tunnel Ovens have a unique and patented heat regulation with 2 burners per zone, one for the over heat and one for the under heat. Allows for better results due to a more exact temperature regulation and energy efficiency.
Turbo Zone
For some products, especially when baking with tins, the use of air circulation from turbo fans in combination with radiant heat is suitable. In such cases the oven is equipped with turbo zones. In a mesh belt oven, the hot air is forced through the belt and in a solid steel belt oven the hot air is blown horizontally along the zone. Turbo zones allows for the baking time to be reduced, lower temperatures used and more equal colouring. With the adjustable fan speed the optimal turbo effect can be reached.
Inspection door
The windows have inspection doors made of glass, with built in lighting for easy supervision of the baking process (not with high temperature version). Exhaust damper manually adjustable or, as an option, motor-driven together with PLC control.
Q-Line Recipe Management for Tunnel Ovens
Continually switches recipes within a zone as soon as the zone is empty. Automatically adjusts settings such as temperatures, turbo, steam, humidity, and damper.
Heating Zones
Individually adjustable heating zones, with separate control of top and bottom heat. These efficient ceramic heating elements are only used when and where they are needed.
HMI Control Panel
The HMI control panel with touch screen is easy to overview and operate. Control the top and bottom heat in all zones, recipes, alarms and more. Get informative logs and do your software updates over the internet - quick and simple.
Energy Saving Technology
Sveba Dahlen tunnel ovens are built with super insulating material that ensures that very limited heat escapes from the ovens resulting in the exterior being relatively cool. The exterior is made of stainless steel and our ovens are known throughout the world for their advanced technology and energy efficiency.
Steam System
In ovens equipped with a steam system the first part of the oven contains steam spread boxes made out of the highest grade of stainless steel. Valves with indicators are used to adjust the proper flow of steam. Possibility to add photocell controlled and/or volume of steam/h system.
Belt driving system
A frequency converter controls the speed of the drive motor, and the robust belt driving system provides optimal reliability and exact baking time. Long ovens and ovens for heavy products are fitted with double drive system, each with its own motor.
Pre-heater
Variable pre-heater controlled from the control panel. Heats up the oven belt before it enters the oven.
Belt tracker
Sensors continuously monitor the movement of the oven belt and adjust it automatically if deviations are detected.
Temperature Sensors
Temperature Sensors both high and low in each heating zone. Ensuring precise temperature control.
Damper Function
Manual or digital damper function with mechanical doors or sensor-controlled doors. Parameters are adjusted according to recipe settings on the HMI control panel. Sensors in the different zones gives control of the humidity level.
Water spray
Water spray at the output improves the surface and crust of the bread, enhancing its esthetic quality.
Belt Brush
Rotating belt brush with pneumatic lifting device efficiently cleans the underside of the oven belt.
Infeed Conveyor and Loader
Customized to suit the production needs. Adjustable speed can be linked to the oven's control panel. A hydraulic air cylinder pushes products onto the oven belt.
Outfeed Conveyor and Unloader
Outfeed conveyor and unloader can be customized to suit your needs. Adjustable speed and control of settings can be integrated with the oven's control panel.
Tunnel Oven Mesh Band
Tight wire mesh belt for free standing bread.
Tunnel Oven Mesh Band
Open wire mesh belt for tin breads and trays
OPTIONS
All Tunnel Ovens are customer adapted, to fit the end product needs. Below is some of the options available.
Continuous recipe change.
Changing recipe continuously in a zone immediately when the zone is empty. Changing recipe baking time immediately when oven is empty. Available with automatic function and manual handling.
Steam Regulation.
Steam regulation on /off by photocell, off delay when no indicated bread.
Steam regulation on /off like above plus adjusting kg steam / hour.
Humidity measurement.
By using humidity sensors in the different zones the humidity parameter can be measured and controlled.
Rotating belt brush.
Pneumatically, liftable and rotating brush for regularly cleaning.
Motorized dampers and oven doors.
Recipe controlled damper and oven door positions.
Thyristor controlled heat.
For a more accurate regulation, the heating elements can be controlled by thyristor regulation.
Water spray at the outfeed.
Gives a shinier product and improves the crust.
Walkway on top of the oven.
Simplifies cleaning and service.
Frequency inverters for the oven chamber exhaust fan(s).
Adjust the fan speed from the PLC screen. The system can be expanded for continuous under pressure / flow regulation.
Air Flow Turbo Zone.
Frequency controlled speed. Individual setting for different recipes. Vertical Turbo air flow through the belt.
Frequency controlled fan speed.
Individual setting for different recipes.
High power section in zone 1.
Add extra power heat elements in the first part of the bottom heat chamber. Controlled from PLC screen, and specified in the recipes.