Various types of biscuit ovens are used in biscuit industry for production of varieties of biscuit . Selection parameter for any biscuit oven are capacity ( which covers length ,width and speed ) , products , baking time and type of fuel .Normally in bakery parlance ovens are defined as per width and no of baking zones .
Biscuit ovens are mainly classified under following types
Direct gas fired
The gas fired oven is used for those product that require great heating power . They can burn natural gas or LPG . The gas is mixed with air in a special mixing pipe based on the Venturi tube principle . In each zone the heat at top and bottom can be independently set by regulating the two combustion air fans which controls the volume of gas fed to the burners . A bar graph potentiometer set by operator can be used to select the heat ratio between top and bottom . Each zone is equipped with a suitable humidity extraction system .
Indirect radiating cyclotherm oven
The Indirect Gas / Diesel fired ovens also known as cyclotherm oven - transfer heat to the product by radiation . Each zone consists of set of tubes at the top and bottom of the baking wire band through which the hot air which has been previously heated by burner flows .
At the end of each baking zone the hot gasses are collected by a plenum and returned by blowing fan to the burner where they are heated up again to the working temperature and sent back to the tube circuit . The heating system is there for completely independent and the products of combustion does not comes in contact with dough being baked . Each zone has extraction fan to remove humidity from baking chambers .
Convection oven
The convection oven is suitable for baking delicate products like cookies , wire cut or sponge . Its baking chamber is constituted by a plenum duct positioned on the top and bottom of the baking wire band where hot air is gently blown out of properly designed slats and comes in contact with the dough . The heat transfer is mainly by convection . The convection type of oven can be direct or indirect . In those cases where the available fuel is natural gas or lpg and the reduction of baking time is a necessity the direct convection is the correct choice . In the In direct convection type of oven the air is heated up by passing through a dedicated heat exchanger hence baking never comes into contact with the dough .Humidity is removed through extraction fans in each zone .
Hybrid Oven
Hybrid ovens are those ovens which have combination of any of the above types of ovens. Sections are divided into different type of heating systems , depending upon product and its baking requirement .
Electric Oven
Electric ovens are not so popular with manufacturers due to low cost of lpg,cng or diesel as compared to electricity . Oven consist of electric heater s which en capsuled into radiating pipes . These are then set for set temperatures by thermostats .
Biscuit ovens are mainly classified under following typesDirect gas fired
The gas fired oven is used for those product that require great heating power . They can burn natural gas or LPG . The gas is mixed with air in a special mixing pipe based on the Venturi tube principle . In each zone the heat at top and bottom can be independently set by regulating the two combustion air fans which controls the volume of gas fed to the burners . A bar graph potentiometer set by operator can be used to select the heat ratio between top and bottom . Each zone is equipped with a suitable humidity extraction system .
Indirect radiating cyclotherm oven
The Indirect Gas / Diesel fired ovens also known as cyclotherm oven - transfer heat to the product by radiation . Each zone consists of set of tubes at the top and bottom of the baking wire band through which the hot air which has been previously heated by burner flows .
At the end of each baking zone the hot gasses are collected by a plenum and returned by blowing fan to the burner where they are heated up again to the working temperature and sent back to the tube circuit . The heating system is there for completely independent and the products of combustion does not comes in contact with dough being baked . Each zone has extraction fan to remove humidity from baking chambers .
Convection oven
The convection oven is suitable for baking delicate products like cookies , wire cut or sponge . Its baking chamber is constituted by a plenum duct positioned on the top and bottom of the baking wire band where hot air is gently blown out of properly designed slats and comes in contact with the dough . The heat transfer is mainly by convection . The convection type of oven can be direct or indirect . In those cases where the available fuel is natural gas or lpg and the reduction of baking time is a necessity the direct convection is the correct choice . In the In direct convection type of oven the air is heated up by passing through a dedicated heat exchanger hence baking never comes into contact with the dough .Humidity is removed through extraction fans in each zone .
Hybrid Oven
Hybrid ovens are those ovens which have combination of any of the above types of ovens. Sections are divided into different type of heating systems , depending upon product and its baking requirement .
Electric Oven
Electric ovens are not so popular with manufacturers due to low cost of lpg,cng or diesel as compared to electricity . Oven consist of electric heater s which en capsuled into radiating pipes . These are then set for set temperatures by thermostats .
