JPH0927381A - Heating method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating method in which a heating treatment can be surely performed at a low temperature not more than 100 deg.C to a core part in a short time without losing the physical property of food. SOLUTION: A material 3 to be heated and a conductive liquid 4 are filled within a heating box 2 in which at least both opposed side plates 21, 22 are set conductive. When the heating box 2 is placed between the feed belts 11 of a Joule heating device 1 opposed thereto and carried, the material 3 in the heating box 2 is electrically heated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating method and apparatus capable of performing heat treatment in a short time without impairing the flavor and texture of food.

[0002]

2. Description of the Related Art Food heat treatment is roughly classified into a method of steaming with food, a method of baking with a gas burner or an electric heater,
There are 5 methods of boiling, frying, and frying.
Each is subjected to a heat treatment suitable for the type of food to give the food its unique flavor. This conventional heating temperature is generally 150 to 180 ° C. from a temperature close to 100 ° C.
Processed at a relatively high temperature of ℃.

[0003]

Therefore, in the steaming, boiling, and frying methods, the food does not come into direct contact with the flame so that the food is less likely to be burned, but in the frying or baking method, the surface is often burned. Especially in fish, etc., to heat-treat the inside of the meat, the surface burns if burnt at a high temperature, and if it burns at a low temperature so that the surface does not burn, moisture escapes more than necessary, and physical properties are greatly impaired It may change the unique flavor that it has. In addition, the heating method of steaming, boiling, or frying does not cause browning as compared with the baking method, but the heat treatment at a high temperature of 100 ° C. or higher may impair the physical properties and texture.

An object of the present invention is to provide a heat treatment method for surely performing heat treatment up to the core portion in a short time at a low temperature of 100 ° C. or lower and without impairing the physical properties of food.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and fills an object to be heated and a conductive liquid in a heating box in which at least opposite side plates are made conductive. However, when the heating box is sandwiched between the feeding belts of the opposing Joule heating device and conveyed, the object to be heated in the heating box is electrically heated. Further, it comprises a Joule heating device which is sandwiched between two feeding belts which are opposed to each other and is transported, and a heating box which is sandwiched and transported between the outward paths of the opposing feeding belts. The gist of the present invention is that the side plate contacting and sandwiching the belt is made conductive, the other side plate / bottom plate is made non-conductive, and the inside is filled with the object to be heated and the conductive liquid.

[0006]

[Operation] The object to be heated and the liquid are filled in a conductive heating box, and are sandwiched between the feeding belts of the Joule heating device that drives them, and are conveyed. Even if the surface is uneven, the conductive liquid filled in the heating box allows a current to flow evenly over the entire object to be heated, which allows Joule heating to be performed uniformly and impairs flavor and texture. Instead, it can be processed in a short time.

[0007]

The heating method and apparatus of the present invention will be described below with reference to the embodiments shown in the drawings. In the figure, 1 is a Joule heating device for heating food, which has an endless power feeding belt 11 stretched between power feeding rollers 12 and 13 at both ends, and two feeding belts 11 and 11 are connected to each other on the forward path side. At least one power supply roller 1 in which the power supply belts 11 and 11 are respectively arranged while facing each other in parallel.
By feeding 2 and 12 in synchronization, the power feeding belt 11
So that the current flows from one of the power supply belts facing left and right to the other power supply belt.
It is configured to supply power to each of the power supply rollers 12, 12, and 13, 13 via a power supply cable.

Two opposing power supply belts 11 and 11
A non-conductive conveyor belt 14 longer than the length of the power feeding belt 11 on the outward path side is disposed at the bottom portion between the outward path sides, and the object to be heated placed on the conveyor belt 14 is located on the one end side. Power feeding belts 1 facing each other when being conveyed to the other end side
When a current flows in the object to be heated, which is a medium having an electric resistance, through the feeding belt, which is sandwiched in contact with the outward side surfaces of the Nos. 1 and 11, and is fed, heat is generated and heated.

In this Joule heating device, an electric current is applied to the object to be heated which is sandwiched between the feeding rollers 12 and 13 on one side through the feeding belt 11 hung on the rollers, and the other feeding belt. 11, roller 1
2 and 13, the amount of heat generated in the object to be heated, that is, the amount of heat generated per unit time according to Joule's law is the product of the electrical resistance of the substance expressed in watts and the square of the current expressed in amperes. Will be equal. Therefore, the amount of generated heat is adjusted according to the heating of the object to be heated.

Even if the outer shape of the object to be heated is uneven, the heating box 2 is used in order to allow the current to flow uniformly. The heating box 2 has a size for storing a fish to be heat-treated, other foods, etc., and has an opening on the top surface so that an object to be heated can be put in and taken out easily. The side plate 21 that directly contacts 11 is a conductive metal plate permitted to be used in the Food Sanitation Law, and the other side plates 22 and the bottom plate 23 are made of a non-conductive material such as wood or synthetic resin plate.

The heating box 2 is filled with an object 3 to be heated, such as a fish, and an electrically conductive liquid 4 so that the object 3 can be uniformly energized and heated even if the object has an uneven surface.
As this liquid, water, salt water, seasoning liquid, fats and oils, thickening polysaccharides, etc. are appropriately used. In this way, by filling the heating box with a conductive liquid together with the object to be heated, even if the surface of the object to be heated is uneven, this concave part is filled with the liquid and uniform electricity can be applied, and heating is evenly and quickly. It is what is done.

In addition, the liquid is adapted to be pushed into an inner surface of the heating box by pushing an object to be heated contained in the heating box, for example, a lump of meat, a large lump of fish meat, etc. without forming a gap in the box. Can be omitted. In this way, when the heating box is used, the meat juice from the meat block does not elute to the outside during heating by energization, so that the taste is not impaired and the texture can be prevented from being impaired.

Moreover, since foods containing water are energized through the feeding belt and heating box to rapidly heat them to about 60 to 105 ° C., it is possible to prevent the surface from being browned.

If there is a gap between the conductive metal plate of the heating box and the power feeding belt, a paper or cloth containing water is interposed between the two to ensure a uniform and reliable contact between the two. Sometimes I do it.

Further, in the belt type Joule heating device, the length and the driving speed of the power feeding belt 11 are predetermined so that the object to be heated can be subjected to a desired heat treatment, but a single device has a sufficient heating time. If this is not possible, two or more of these devices may be arranged in series.

[0016]

According to the heating method of the present invention, the object to be heated and the liquid are filled in the electrically conductive heating box and heated by the belt type Joule heating device. Even if the surface of the is uneven, the conductive liquid filled in the heating box allows the current to flow evenly over the entire object to be heated, so that Joule heating can be performed uniformly, and the flavor and texture can be improved. There is an advantage that it can be processed in a short time without damaging it. According to the heating device of the second aspect, there is an advantage that the device is simple and the inside can be reliably heated even if the temperature is lower than the conventional heat treatment temperature.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a heating method and a heating device of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is an explanatory diagram of a heating box.

[Explanation of symbols]

 1 Joule heating device 11 Power supply belt 12 Power supply roller 13 Power supply roller 14 Conveyor belt 2 Heating box 21 Side plate 22 End plate 23 Bottom plate 3 Heated object 4 Liquid

Claims (2)

[Claims] 1. A heating box in which at least opposite side plates are made conductive is filled with a material to be heated and a conductive liquid, and the heating box is sandwiched between opposing feeding belts of a Joule heating device. The heating method is characterized in that the object to be heated in the heating box is electrically heated when being conveyed as described above. 2. A Joule heating device configured to be sandwiched between two opposing power feeding belts for conveyance, and a heating box configured to be sandwiched between the forward sides of the opposing power feeding belts for transportation. The side plate that holds the heating box in contact with the feeding belt is made conductive, and the other side plate and bottom plate are made non-conductive.
A heating device characterized by filling an object to be heated and a conductive liquid inside.