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A Vacuum fryer is a deep-frying device originally developed for potato chip
Potato chip

A potato chip is a thin slice of potato deep frying or Baking until crisp. Potato chips serve as an appetizer, side dish, or snack food. Commercial varieties are packaged for sale, usually in bags....
 production.

Vacuum fryers are fit to process low-quality potato
Potato

The potato is a starchy, tuberous crop from the perennial plant Solanum tuberosum of the Solanaceae family. The word potato may refer to the plant itself as well....
es that contain higher sugar levels than normal, as they frequently have to be processed in spring and early summer before the potatoes from the new harvest
Harvest

In agriculture, the harvest is the process of gathering mature crop from the field s. Reaping is the cutting of grain or Pulse for harvest, typically using a scythe, sickle, or reaper....
 become available. With vacuum frying it is easier to maintain natural colors and flavours of the finished product.






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A Vacuum fryer is a deep-frying device originally developed for potato chip
Potato chip

A potato chip is a thin slice of potato deep frying or Baking until crisp. Potato chips serve as an appetizer, side dish, or snack food. Commercial varieties are packaged for sale, usually in bags....
 production.

Vacuum fryers are fit to process low-quality potato
Potato

The potato is a starchy, tuberous crop from the perennial plant Solanum tuberosum of the Solanaceae family. The word potato may refer to the plant itself as well....
es that contain higher sugar levels than normal, as they frequently have to be processed in spring and early summer before the potatoes from the new harvest
Harvest

In agriculture, the harvest is the process of gathering mature crop from the field s. Reaping is the cutting of grain or Pulse for harvest, typically using a scythe, sickle, or reaper....
 become available. With vacuum frying it is easier to maintain natural colors and flavours of the finished product. Due to the lower temperature
Temperature

In physics, temperature is a physical property of a Physical system that underlies the common notions of hot and cold; something that feels hotter generally has the greater temperature....
s applied (approx. 130°C), the formation of suspected carcinogen
Carcinogen

The term carcinogen refers to any substance, radionuclide or radiation that is an agent directly involved in the promotion of cancer or in the increase of its propagation....
 acrylamide
Acrylamide

The chemical compound acrylamide has the chemical formula Carbon3Hydrogen5NitrogenOxygen. Its IUPAC name is 2-propenamide....
 is significantly lower than in standard atmospheric fryers, where the frying temperature is approx. 170°C. The fat
Fat

Fats consist of a wide group of compounds that are generally soluble in organic solvents and largely insoluble in water. Chemistry, fats are generally ester of glycerol and fatty acids....
 absorption of the products is also reported to be lower than in atmospheric fryers. In South East Asia (mainly Philippines
Philippines

The Philippines, officially known as the Republic of the Philippines, is a country in Southeast Asia with Manila as its capital city. It comprises 7,107 islands in the western Pacific Ocean....
, Thailand
Thailand

The Kingdom of Thailand is an independent country that lies in the heart of Southeast Asia. It is bordered to the north by Laos and Myanmar, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the west by the Andaman Sea and Myanmar....
, China
China

China is a Culture of China, an ancient civilization, and, depending on perspective, a national or multinational entity extending over a large area in East Asia....
 and Indonesia
Indonesia

The Republic of Indonesia , is a transcontinental country in Southeast Asia and Oceania. Comprising Islands of Indonesia, it is the world's largest Archipelago state....
) batch type vacuum fryers are mainly used for the production of fruit chips. However, these machines are only appropriate for relatively small production companies.

Continuously working vacuum fryers


For larger production quantities, continuously working vacuum fryers are available. In these installations, the vacuum
Vacuum

A vacuum is a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure. The word comes from the Latin term for "empty," but in reality, no volume of space can ever be perfectly empty....
 frying pan is installed in a stainless steel
Steel

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight , depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese, chromium, vanadium, and tungsten....
 vacuum tube. The infeed of the raw product is carried out through a rotary air lock
Airlock

An airlock is a device which permits the passage of people and objects between a pressure vessel and its surroundings while minimizing the change of pressure in the vessel and loss of air from it....
. Depending on the application, the frying pan
Frying pan

A frying pan, frypan, or skillet is a cooking pan used for frying, searing, and Maillard reaction foods. It is typically a 20 to 30 cm diameter flat pan with flared sides and no lid....
 itself is designed to meet the different product specifications. A transport belt takes the finished product out of the fryer and towards the outfeed system. A lock chamber at the exit of the vacuum tube prevents air from entering the vacuum zone, and a belt system takes the product from one zone to another.

The vacuum is created by vacuum pump
Vacuum pump

A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke....
s, and the whole system is controlled by a programmable logic controller
Programmable logic controller

A programmable logic controller or programmable controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, control of amusement rides, or control of lighting fixtures....
.

In batch fryers, the frying oil has to be replaced quite often as it is sensitive to temperature changes. Continuously working vacuum fryers lead to a longer lifetime of the frying oil and therefore lower the production costs. Vacuum fryers can also reduce oil content in fried foods. The amount of reduced oil content, usually 1-3%, depends on the type of the vacuum fryer.

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