JP3891525B2 - Canned heating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides heating for efficient heating in a short time while continuously transporting the canned product after filling and sealing. apparatus In particular, for canned products filled and sealed at low temperatures, such as beer and carbonated beverages, dew condensation on the surface of the can body due to the temperature difference from the outside air temperature (the temperature at the place where the canned product is stored immediately after production) Canned food suitable for use in cases where the can is heated at least to near ambient temperature to prevent apparatus About.
[0002]
[Prior art]
When canning effervescent beverages containing carbon dioxide gas such as beer, carbon dioxide dissolved in the beverage is unlikely to escape at the stage where the beverage is usually filled in a can container and sealed with a can lid In addition, although the temperature of the beverage itself is maintained at a low temperature (1 to 15 ° C.), the temperature of the canned food immediately after filling and sealing the beverage may be significantly lower than the outside air temperature. If it is left as it is, condensation will occur on the surface of the can body, and when it is packed in a cardboard case, the cardboard case is moistened, which may cause the cardboard case to be deformed or broken during transportation. In addition, wrinkles are generated in the cardboard case and rust is generated in the can.
[0003]
Therefore, in order to eliminate the temperature difference from the outside temperature in advance and prevent condensation on the surface of the can body, immediately after filling and sealing the carbon dioxide-containing beverage, the can production line is placed vertically. Conventionally, for canned food that is continuously conveyed in an upright state (upright state), it is heated by showering with hot water or steam from above so that the temperature of the canned food becomes substantially equal to the outside air temperature. It is made from.
[0004]
[Problems to be solved by the invention]
However, according to the conventional method for heating canned food as described above, the spraying of hot water, steam, etc. causes steam to stand up around the heating device, resulting in poor visibility, high temperature and high humidity, and the working environment is reduced. In addition to being uncomfortable, there is a risk of burns to workers, and when a beverage is filled or sealed in a clean room, the area around the heating device nearby is hot. -High humidity promotes the growth of microorganisms, which increases the risk of the microorganisms entering the clean room, which is not preferable.
[0005]
On the other hand, the canned food itself that is heat-treated by such a heating method is also heated from the upper side of the canned food, so that a temperature difference is generated such that the temperature becomes higher toward the upper side, and the self-convection of the contents is reduced. It is difficult to work, and it takes a long time for the whole to reach a predetermined temperature, and the upper part of the contents may be exposed to a high temperature for a long time, which may lead to deterioration of taste, aroma, and color.
[0006]
The present invention is intended to solve the above-described problems. Specifically, when the temperature of a canned product produced by filling and sealing a low-temperature content liquid is at least close to the outside air temperature. In addition, the metal can body is heated by high-frequency induction heating to heat the can, thereby making the working environment safe and comfortable, allowing the entire can to reach the predetermined temperature in a short time, The high-frequency induction heating means is prevented from becoming hot due to its own heat generation and radiant heat from the can body. In addition, it is an object of the present invention to make it possible to heat canned food efficiently by utilizing the heat generated by the high-frequency induction heating means itself.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides the following: The filling temperature is 1-15 ° C While the can is filled and sealed in the can body and the outer surface is washed, the can is continuously transported at a constant speed while the outer surface of the can is dried. To make the temperature of the canned food at least near the outside temperature, In an apparatus for heating canned food, On each side A plurality of induction heating coils are arranged in series, An electric system for sending an electric current to the induction heating coil is individually distributed for each of the pair of left and right induction heating coils arranged on both sides of the conveyance path, and The conveyance path and each induction heating coil are covered with a cover. The blower as an air blowing means is attached to the cover, and a partition is formed along the inside of the cover wall except for a part of the cover, and the exhaust side of the blower communicates with a space inside the partition. The intake side of the air is connected to the space between the cover and the partition wall via an intake cylinder for introducing external air, so that the air flow from the blower It flows toward the induction heating coil, flows around each can and the induction heating coil, then flows through the space between the cover and the partition, is returned to the intake cylinder, and part is released to the outside of the cover. Is sucked into the blower again, mixed with the newly sucked air from the outside of the cover, and then flows again toward each canned food being transported and the induction heating coils on both sides thereof, An air flow path that circulates in the cover is formed.
[0009]
In addition, the above claims 1 In the canned heating apparatus described in claim 1, 2 In addition to the conveying means for continuously conveying the cans in the upright state along the conveying path at a constant speed, the cans are rotated in contact with the cans being conveyed by the conveying means. Therefore, a rotational force applying means is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the canned food of the present invention is heated. apparatus The embodiment will be described in detail based on the drawings.
[0012]
Heating the can of the present invention apparatus 1 shows a state where the entire apparatus is viewed from the side, and FIG. 2 shows a state where the entire apparatus is viewed from above. This canned heating apparatus 1 is like beer. To prevent condensation on the can body surface due to the temperature difference between canned and filled cans at low temperatures (1 to 15 ° C) and the outside air temperature in the canned production line for carbon dioxide-containing beverages In order to heat (usually up to about ± 5 ° C outside temperature), it is incorporated into the process of the canning production line.
[0013]
That is, although not shown, in a production line for carbon dioxide-containing beverage canned foods such as canned beer, a beverage filling machine that distributes and fills the low-temperature beverage (for example, 2 to 4 ° C. beer) that is fed. (Filler) distributes and fills beverages into each of the cleaned empty cans that are continuously fed, and then the beverage-filled cans are continuously rolled by a can conveyor ( Continuously as a canned beverage canned product by wrapping the can lid around each beverage-filled can body by a can lid winding machine that is continuously fed from the can lid supply device. It is sent out from the can lid winder.
[0014]
In such a canned beverage production line, each canned product continuously sent out from the can lid clamping machine as a sealed canned beverage can be washed with water on the outer surface of the can body, and then the water is roughly removed by air blow or the like. After that, the canned food is continuously fed into the canned heating apparatus 1 because it is heated until the temperature of the canned food becomes about the outside air temperature ± 5 ° C. In addition, it is necessary to dry the water adhering to the outer surface of the can body by this heating, and when the outside air temperature is low such as less than 10 ° C., the can can be heated to a temperature higher than the outside air temperature by 10 ° C. or more. Sometimes.
[0015]
In the canned heating apparatus 1, in order to efficiently heat-process a large amount of canned food continuously fed from the can lid winding machine, as shown in FIG. 2, a conveyance path 3 for heating the canned food is provided in parallel. For example, in the case of an apparatus having a capacity of 2000 cpm (number of processed cans / minute), a plurality of (in the illustrated case, there are 5 rows, but in reality about 10 rows) In each row, each can is heated at the same time with a capacity of 200 cpm (conveying speed is about 14 m / min). (The conveyance path 3 of the canned heating apparatus 1 may be a single row, but is preferably a multi-row in order to increase the heat treatment speed.)
[0016]
The plurality of rows of conveyance paths 3 of the canned heating apparatus 1 are covered with a stainless steel cover 4 common to each row, and both ends of each conveyance path 3 penetrate the cover 4 and come out to the outside. Although not shown, a can inlet and an outlet are provided in the cover 4 for each row of the transport path 3, and external air is sucked into the cover 4 and circulated through the ceiling of the cover 4. A blower 5 serving as a blower, an intake cylinder 6 for introducing external air into the blower 5, a motor 7 for rotationally driving a fan of the blower 5, and the like are installed.
[0017]
In the present embodiment, the cover 4 is divided into a plurality of (three in the illustrated example) members along the longitudinal direction of the transport path 3, and both ends of the transport path 3 are removed by connecting each member. The entire cover 4 is configured so as to cover the most part, and a blower 5, an intake cylinder 6 and a motor 7 are installed for each member.
[0018]
FIG. 3 shows a schematic view of one row of the conveyance path 3 in such a canned heating apparatus 1 (omitted from the middle part of the conveyance path 3) as viewed from the side, and FIG. FIG. 5 shows a portion for supplying canned food to the transport path 3 in the row shown in FIG.
[0019]
In each row of the canned heating apparatus 1, as shown in FIG. 5, each canned product 2 guided by side guides 13 arranged on both sides and continuously fed in an upright state by the carry-in conveyor 8 is screwed. 9, each canned product 2 is fed into a conveyance path 3 for heat treatment.
[0020]
Each canned product 2 sent to the transport path 3 is transported at a constant speed along the transport path 3 by the transport belt 10 in an upright state with a constant interval, as shown in FIGS. 3 and 4. However, after being gradually heated by a plurality of induction heating coils 12 arranged as high-frequency induction heating means on both sides of the conveyance path 3, the temperature reaches a predetermined temperature (outside temperature ± 5 ° C.) and is sent out from the conveyance path 3. .
[0021]
FIG. 6 shows a cross section of the conveyance path 3 of the canned heating apparatus 1 for heating each canned 2 (in the drawing, an example of a can in which the open end of a two-piece can body is sealed with a can lid). A non-magnetic support plate 11 made of a heat-resistant synthetic resin material such as MC nylon is installed in the transfer path 3 so as to extend along the transfer direction. The upper part of the conveying belt 10 that is an endless belt is introduced into a groove that is recessed on the upper surface side of the unit so as to be movable in the conveying direction.
[0022]
The conveyor belt 10 for conveying each can 2 is an endless belt made of a heat-resistant material, and the conveyor belt 10 is wound around the inner surface of the conveyor belt 10 as shown in FIG. Teeth 10b meshing with the teeth of the drive sprocket and driven sprocket are formed at predetermined intervals along the longitudinal direction of the belt 10, and at a constant interval by a screw 9 on the belt outer surface side of the conveyor belt 10. In order to move the cans 2 in the upright state while maintaining the interval, the lower portions of the cans 2 are moved in the transport direction at predetermined intervals along the longitudinal direction at the center in the width direction of the belt 10. A protrusion 10a for pressing is formed.
[0023]
The upper surface of the conveyor belt 10 located in the groove of the support plate 11 does not interfere with the rotation of each can 2 as will be described later by contacting the can bottom of each can 2. Passing through a position several millimeters lower than the upper surface of 11, only the protrusion 10 a is in contact with the can 2, and the upper surface of the support plate 11 in contact with the can bottom of the can 2 is slippery with less frictional resistance. It has become a good thing.
[0024]
Further, in the conveyance path 3, side guides 13 made of non-magnetic material are provided on both sides of the row of cans 2 in order to guide the cans 2 so as not to be displaced laterally above the support plate 11. Although extending along the conveyance direction and not shown in FIGS. 3 to 5, in one side of the conveyance path 3, a groove recessed in the upper surface side of the end portion in the width direction of the support plate 11. Further, as a rotational force applying means for rotating each can 2 transported by the transport belt 10, a rotational force applying belt 14, which is an elastic rubber-made rod-like endless belt, is opposite to the transport direction. Introduced to be movable to the side.
[0025]
The rotational force imparting belt 14 is in an upright state with the bottom of the can body down, and for each canned product 2 being transported at a constant speed by the transport belt 10, the outer surface of the tapered portion formed at the bottom of the can body The can 2 that is in frictional contact with the lower end (grounding portion) at one point, and is moved by being pushed by the protrusion 10a of the conveyor belt 10, as shown in FIG. The can 2 is brought into contact with the shortest contact length that does not hinder the progress of the canned food 2 and moves in the conveying direction while smoothly rotating so as to roll along the belt 14.
[0026]
At that time, the conveying means of each can 2 is arranged at the center of the conveying path 3 and contacts the lower end of the body portion near the bottom of each can 2 to push the can 2 in the conveying direction (that is, the can 2 The protrusions 10a are pushed at a position lower than the center of gravity of the conveyor belt 10 formed at equal intervals. Therefore, even if the rotational force applying belts 14 are brought into contact with the cans 2, the protrusions 10a As a result, each canned product 2 is reliably and stably held, so that each canned product 2 can be reliably conveyed at regular intervals.
[0027]
In addition, the portions of each can 2 where the protrusion 10a of the conveyor belt 10 and the rotational force applying belt 14 come into contact are the lower end and the bottom of the can body, and the case is a squeezed iron can with a very thin body wall thickness. However, since it is a comparatively thick part, the deformation | transformation of the can body by the contact with these members 10 and 14 and press does not generate | occur | produce.
[0028]
The means for rotating each can 2 is not limited to the rotational force imparting belt 14 that moves in the opposite direction to the conveyor belt 10, and for example, a rubber rod-like body fixed to the support plate 11 or a rubber-made body. It may be a roll, or may be a belt that moves in the same direction as the conveyor belt 10 and moves at a higher speed than the conveyor belt 10. For example, the belt moves at a higher speed than the conveyor belt 10. When such a rotational force application belt is used as the rotational force application means, while conveying each can 2 at high speed without reducing the conveyance speed of the conveyance belt 10 by friction with the rotational force application means, Each canned product 2 can be rotated at a constant rotation amount.
[0029]
In addition, the position of the can body that contacts the rotational force applying belt 14 is not limited to the lower end of the tapered portion at the bottom of the two-piece can body, but may be the upper portion or the trunk portion, and the can body is a three-piece can body. May be a necked-in portion of the can lid tightening portion or the body portion, but in order to transport the can 2 in a stable state, a position below the center of gravity of the can is preferable.
[0030]
As described above, a pair of left and right induction heating coils 12 are provided on both sides of the conveyance path 3 including the conveyance belt 10, the support plate 11, and the rotational force applying belt 14 as means for heating the can 2 by high frequency induction heating. As shown in FIG. 6, each induction heating coil 12 has an induction heating coil main body 12a housed in a non-magnetic case 12b such as an epoxy resin. The side of the coil 12 facing the can 2 is covered with a relatively thin cover plate 12c. The thickness of the cover plate 12c shortens the distance between the induction heating coil body 12a and the can 2. Furthermore, the thickness is 2 mm inside or outside.
[0031]
The body 12a of the induction heating coil 3 is like a coil 12 having a conductive wire 12e wound around a ferrite core 12d. By passing a current through the conductive wire 12e, the vicinity of the induction heating coil 12 is passed through the cover plate 12c of the case. The can 2 passing through the can is heated by Joule heat based on an induced current (eddy current) generated in the metal can, thereby heating the content beverage through the can, 2 is heated.
[0032]
In this embodiment, as shown in FIG. 3, the induction heating coils 12 arranged on both sides of the conveyance path 3 as high-frequency induction heating means include a plurality of cans 2 (illustrated) conveyed at regular intervals. The size is such that three can be heated at the same time, and as shown in FIG. E-type ferrite core is wound with 4 turns of litz wire, the maximum current can flow 80 amps, about 30 induction heating coils that continue to operate normally just by blowing air and cooling) Although not shown, an electric system for sending an electric current to the induction heating coil 12 is arranged on both sides of the conveyance path 3 for each of the induction heating coils 12 arranged in series. A pair of left and right induction heating Each of which is individually distributed yl 12 each.
[0033]
Each of the electric systems of the pair of left and right induction heating coils 12 is connected to one control device with a monitor. In this control device with a monitor, induction is performed for each pair of left and right induction heating coils 12. Failures of the heating coil itself and the electrical system can be individually monitored, and currents sent to the induction heating coils 12 through the electrical systems can be individually turned on and off by individual switches.
[0034]
According to such a configuration of the present embodiment, since a large number of induction heating coils are arranged in each conveyance path 3, even if a failure occurs in one induction heating coil 12 or its electrical system. The canned foods 2 being transported are not heated at all and are heated to a temperature close to the final canned food 2 heating temperature without affecting the operation of the canned food production line. Further, each induction heating coil 12 is covered with the cover 4 simply by displaying whether each induction heating coil 12 or its electric system is operating normally on the monitor of the control device for each induction heating coil 12. Even in such a case, the location where the failure has occurred can be identified quickly, and the failure location can be replaced quickly.
[0035]
By the way, in the canned heating apparatus 1 of this embodiment which was gradually heated with the some induction heating coil 12, conveying each can 2 along the conveyance path 3 as mentioned above, the conveyance for heating a can As shown in FIG. 1 and FIG. 2, the path 3 and each induction heating coil 12 are substantially entirely excluding both ends (portions where the induction heating coil 12 is disposed). It is covered with a cover 4 installed on the ceiling.
[0036]
In the present embodiment, the cover 4 is made of stainless steel having a high effect of blocking high frequencies, whereby high frequencies from the induction heating coil 12 leak outside the cover 4 and adversely affect electronic devices and the like. To prevent such effects.
[0037]
In the canned heating apparatus 1 of this embodiment, the blower 5 installed on the ceiling of the cover 4 is driven by the motor 7 so that air is sucked into the cover 4 from the suction cylinder 6 and sucked. The air that has passed through each of the cans 2 and the induction heating coil 12 being transported and then collected by the blower 5 is mixed again with the air that has been newly sucked from the outside of the cover 4, and the inside of the cover 4. It has come to circulate.
[0038]
That is, in this embodiment, as shown in FIGS. 9 and 10, the partition wall 16 is further formed inside the cover 4 along the wall of the cover 4 except for the lower portion, so that the space between the cover 4 and the partition wall 16 is increased. The air flow path through which the air rises is formed, the exhaust side of the blower 5 is communicated with the space inside the partition wall 16, and the intake side of the blower 5 is connected via an intake cylinder 6 for introducing external air. The air flow path formed between the cover 4 and the partition wall 16 is communicated.
[0039]
As a result, the fan (not shown) of the blower 5 is rotationally driven by the motor 7 so that the air sucked into the cover 4 through the intake cylinder 6 is moved around each canned food 2 and the induction heating coil 12 being conveyed. From the top to the bottom, then flows from the bottom to the top through the air flow path between the cover 4 and the partition wall 16, returned to the intake cylinder 6, and partly released to the outside of the cover 4. A part is again sucked into the blower 5, mixed with air newly sucked from the outside of the cover 4, and then repeatedly flows toward the can 2 being conveyed and the induction heating coil 12.
[0040]
At that time, the air that has passed around each induction heating coil 12 is heated by receiving induction heat coil 12 that heats up (induction heating coil 12 always receives radiant heat from the can of heated can 2, The surroundings are heated by the cans 2 and the induction heating coils 12 that pass through the can body while generating heat. The air itself is heated by cooling the member.
[0041]
About such heating of the air itself, depending on the magnitude of the current passed through each induction heating coil 12, the induction heating coil 12 and the like can be repeated many times 3 to 5 minutes after the operation of the canned heating device 1 is started. The temperature of the air that has passed around each of the cans 2 being transported rises to 50 to 120 ° C. (even when part of the air is always replaced with outside air), and the air heated in such a way Has the effect of giving heat to the low temperature canned food 2.
[0042]
That is, the air flowing in the vicinity of the conveyance path 3 takes away the heat generated by each induction heating coil 12 to cool each induction heating coil 12 so that each induction heating coil 12 continues to operate normally. In addition to serving as a cooling means, each canned food 2 is heated to serve as an auxiliary heating means for assisting the main heating means by high frequency induction heating, and as a result, such air flow. As a result, the temperature rise time of the can 2 is shortened.
[0043]
In addition, about the ratio which replaces a part of the air which returned near the conveyance path 3 and returned to external air (it replaces with external air), the magnitude | size of the electric current sent through each induction heating coil 12, and each in conveyance It is substantially determined by how many times the temperature of the air flowing (sprayed) toward the can 2 and the induction heating coil 12 is maintained.
[0044]
In this regard, according to the experiments by the present inventors, when the outside air temperature is 20 ° C., the temperature of the air that has flowed toward the cans 2 being conveyed and the induction heating coil 12 immediately passes through them. When the temperature reaches about 80 ° C., the air cools down to about 70 ° C. until it is collected in the blower 5, so that about 20% of the air is replaced with outside air, Is mixed with the remaining approximately 80% of the air, the temperature of the air flow flowing toward each can 2 being conveyed and the induction heating coil 12 can always be maintained at approximately 60 ° C.
[0045]
According to the method and apparatus for heating canned food of the present embodiment as described above, hot water, steam, etc. are heated in the working environment as compared with the case where the canned food is heated by a shower of hot water, steam, etc. as in the prior art. It is possible to make the work environment safer and more comfortable, and the atmosphere for filling and sealing beverages in the vicinity of the heat treatment device should not be set to high temperature and high humidity, which are conditions that are likely to generate microorganisms. Just do it.
[0046]
In addition, in the conventional heating method, the canned food is heated unilaterally from the upper side, so that a temperature difference is generated in the beverage inside the canned food so that the temperature increases toward the upper side, and self-convection of the content works. It is difficult, and it takes time (about 3 minutes) until the whole can reaches a predetermined temperature. In the present embodiment, the entire can is efficiently generated by heat generation of the can body by the plurality of induction heating coils 12. By heating to, the entire can can reach the set temperature in a short time (30 seconds to 2 minutes).
[0047]
In addition, when the can is heated unilaterally from the upper side, the head space (the space portion without the contents in the upper portion of the can) is first heated, so that the pressure of the head space that determines the internal pressure of the can is increased by heating. In this embodiment, since the can is heated through the can body, and not heated from the head space side in particular, the pressure of the head space can be kept low during heating, and as a result, the can body is deformed due to a change in the can internal pressure. The wall thickness of the can can be reduced to the minimum necessary thickness to suppress the above.
[0048]
In addition, how much canned food is heated depends on the size of the canned food, the temperature of the canned food, the outside air temperature and humidity, and it is necessary to change the degree of heating appropriately according to the situation. In the embodiment, such a change in the degree of heating can be performed very easily only by changing the magnitude of the current flowing through each induction heating coil 12 or by changing the number of induction heating coils 12 through which current flows. Can do.
[0049]
Furthermore, according to the present embodiment, the induction heating coil 12 itself is heated to a temperature exceeding 120 ° C. by cooling the heat generation of the induction heating coil 12 itself by the air sucked into the cover 4 from the outside by the blower 5. It is possible to prevent the insulator 12 covering the induction heating coil 12 from being damaged and melting the case 12b or the oscillator from being damaged by heating, and the induction heating coil 12 has been warmed by cooling. Since a part of the air is circulated again around each can and used for heating each can at a low temperature, each can can be heated with high thermal efficiency.
[0050]
The heating of the canned product of the present invention apparatus However, the present invention is not limited to the above-described embodiment. For example, a turret is used instead of the screw 9 as a means for supplying canned food to the transport path 3. It is possible to change the size and number of the plurality of induction heating coils 12 serving as the high-frequency induction heating means. Ru It is also possible, and blower 5 serving as a blowing means In Therefore, it is possible to install the blower 5 in a place other than the ceiling of the cover 4. Ru The specific structure thereof can be appropriately changed.
[0051]
【The invention's effect】
Heating the can of the present invention as described above apparatus According to the above, it is possible to make the working environment safe and comfortable by high-frequency induction heating by the induction heating coil, and to reach the predetermined temperature in a short time in the entire can, and around the heating device. Since the humidity does not become high, the growth of microorganisms in the vicinity of the beverage filling / sealing work atmosphere can be suppressed, and the risk that microorganisms that alter the canned beverage can enter the can can be avoided.
[0052]
Moreover, the blowing means Depending on the blower By cooling the heat generated by the induction heating coil with the air sucked into the cover from the outside, the induction heating coil itself can be prevented from being overheated and damaged so that the can cannot be heated. Each of the cans can be heated with high thermal efficiency by circulating a part of the air heated by cooling the induction heating coil again around each can and using it for heating each can.
[Brief description of the drawings]
FIG. 1 Heating of canned food of the present invention apparatus The side view of the whole apparatus which shows one Embodiment.
2 is a top view of the whole canned heating apparatus shown in FIG. 1. FIG.
3 is a side view showing an outline of a row of one conveyance path in the canned heating apparatus shown in FIGS. 1 and 2. FIG.
4 is a top view of a row of conveyance paths shown in FIG. 3. FIG.
5 is a side view showing a portion for supplying each can that is continuously sent to the conveyance path at regular intervals in the conveyance path row shown in FIG. 3; FIG.
6 is a cross-sectional view of the conveyance path of the canned heating apparatus shown in FIG.
7 is a side view showing a conveyance belt in the conveyance path shown in FIG. 6. FIG.
8 is an explanatory bottom view showing the operation of the rotational force applying belt in the conveyance path shown in FIG. 6;
9 is a cross-sectional explanatory view taken along the line AA in FIG. 2, showing the flow of air in the cover in the canned heating apparatus shown in FIGS. 1 and 2. FIG.
10 is a cross-sectional explanatory view taken along the line BB of FIG. 9 showing the flow of air in the cover in the canned heating apparatus shown in FIGS. 1 and 2. FIG.
[Explanation of symbols]
1 Canned heating device
2 Canned food
3 transport path
4 Cover
5 Blower (Ventilation means)
12 Induction heating coil
14 Rotating force application belt

Claims (2)

While filling the can body with a temperature of 1 to 15 ° C at the time of filling and sealing the can body, the outside surface side of the can is dried while continuously transporting the can after washing the outside surface side at a constant speed. In order to bring the temperature of the can into at least a temperature close to the outside air temperature, in the apparatus for heating the can, a plurality of induction heating coils are arranged in series on both sides of the canned conveyance path, and the induction heating coil has a current. Is electrically distributed for each of the pair of left and right induction heating coils arranged on both sides of the conveyance path , and the conveyance path and each induction heating coil are covered by a cover, A blower serving as an air blowing means is attached to the inner wall of the cover except for a part of the cover, and the exhaust side of the blower communicates with the space inside the partition, and the intake side of the blower is , The air flow from the blower is transferred to the cans being conveyed and the induction heating coils on both sides of the blower. After flowing around each can and the induction heating coil, it flows through the space between the cover and the bulkhead, is returned to the intake cylinder, part is discharged to the outside of the cover, and part is again blower An air flow path that circulates in the cover is drawn and mixed with air newly sucked from the outside of the cover, and then flows again toward each canned food being transported and induction heating coils on both sides thereof. A can heating apparatus characterized by being formed. Along with a conveying means for continuously conveying each can in an upright state along the conveying path at a constant speed, a rotational force applying means for rotating each can in contact with each can being conveyed by the conveying means The can heating apparatus according to claim 1 , wherein the can is provided.

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