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Long stainless steel tunnel oven with multiple heating zones, control panel and conveyor band

05 · Bakery & Snack Food — Equipment

Tunnel Oven

A continuous oven that carries products on a band through heating zones, each set to its own temperature, for steady industrial baking.

Rating
Sized to baking area (band width × length) and bake time for your product
Versions
Gas fired · Electric · Direct firing · Indirect firing
Best for
Bakeries and snack plants moving from rack or deck ovens to continuous baking, or building a new biscuit or bread line
  • Separately controlled heating zones for a defined baking profile
  • Gas or electric, direct or indirect firing
  • Steel band or mesh band chosen by product
  • Sized on band width and bake time, not on a generic rating
Request a quoteChoose a configuration

Short answer: A tunnel oven is a long continuous oven in which a band carries the product through several heating zones, each with its own temperature and airflow. The baking profile of your product, the band width you need and the energy source on site decide the oven length, zone layout and firing type.

How it works

The oven has an infeed end, a series of insulated baking zones, a band (steel or mesh) driven by drums at both ends, burners or electric elements, exhaust fans and dampers, and a control panel.

  1. Formed products are placed on the band at the infeed.
  2. In the first zones, heat sets the shape and starts rising or spreading.
  3. Middle zones bake through and drive out moisture; exhaust dampers remove steam.
  4. Final zones finish colour and crispness.
  5. Products leave the oven onto a cooling conveyor.

Each zone’s top and bottom heat can usually be set separately, which is how one oven handles different products.

Which configuration fits

Form Suits Watch out for
Gas fired Large ovens, low gas cost Gas supply, burner servicing
Electric Sites without gas, simple control Higher energy cost in many regions
Direct firing Biscuits, crackers Combustion gases in the chamber
Indirect firing Bread, cakes, sensitive products Slower heat-up, more complex heat exchanger

Heating type and firing method are separate choices: a gas oven can be direct or indirect. Many lines also combine the two, with direct-fired zones at the start for fast heat and indirect or convection zones later for even colour. Insulation thickness and exhaust design have a large effect on running cost, so ask for them to be stated in the quotation.

What we need from you to quote

  • Products and their baking profiles (temperature and time)
  • Piece size, weight and target output
  • Band width, band type and loading layout
  • Product moisture before baking
  • Energy source, power supply, exhaust route and ceiling height
  • Infeed and outfeed equipment the oven must connect to

Where it sits in a line

The tunnel oven is the centre of the biscuit production line, fed by the forming section and followed by a cooling conveyor. It is also used for baked snacks and toasting stages, including on the corn flakes and breakfast cereal line. After cooling, products go to packing and a food metal detector.

Common configurations

  1. Option A

    Gas fired

    burners heat the zones, common for larger ovens where gas is available at a good price.

  2. Option B

    Electric

    heating elements in each zone, simple to control and suited to sites without gas supply.

  3. Option C

    Direct firing

    burners heat the baking chamber directly for fast heat transfer, common for biscuits and crackers.

  4. Option D

    Indirect firing

    hot gases circulate in radiator tubes, so combustion gases do not touch the product, often chosen for bread and cakes.

What we confirm before quoting

Our engineers check these points with you, so the quotation fits your site rather than a catalogue default.

  1. 01Baking profile: temperature and time in each zone
  2. 02Effective band width and the product layout across it
  3. 03Product moisture and band loading
  4. 04Energy source, energy use and exhaust and fume routing
  5. 05Band type (steel, mesh) and loading and unloading interfaces

Frequently asked questions

  1. How long should a tunnel oven be?

    Oven length follows from bake time and band speed. Band speed is set by the output you need and how many pieces fit across the band. We calculate it from your product size, weight and baking time.

  2. Steel band or mesh band?

    A solid steel band gives a flat base and suits biscuits and crackers. Mesh bands let heat reach the underside more directly and suit products that need more bottom heat or must release moisture underneath.

  3. Direct or indirect firing?

    Direct firing heats faster and is common for biscuits. Indirect firing keeps combustion gases away from the product and gives gentler, more even heat, often used for bread and cakes.

Get a quote for the Tunnel Oven

Tell us your raw material, finished product and target output. Our engineers reply with a matched configuration and quotation.

What to send with your inquiry

  1. 1Raw material and its condition
  2. 2Finished product and packaging
  3. 3Target output — raw input or finished product
  4. 4Site photos, power supply, utilities

Email sales@hnfoda.com

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