WO2006080233A1

WO2006080233A1 - Device and method for induction-heating beverage can

Info

Publication number: WO2006080233A1
Application number: PCT/JP2006/300728
Authority: WO
Inventors: Masami Matsunaga; Shigeki Matsuura
Original assignee: Daiwa Can Company
Priority date: 2005-01-25
Filing date: 2006-01-19
Publication date: 2006-08-03
Also published as: JP4562765B2; TW200626439A; JPWO2006080233A1; KR20070110002A; TWI350264B; KR100842025B1

Abstract

A device and a method for induction-heating a beverage can. The device comprises a can holding body holding a metal beverage can in which a screw part is formed at a mouth part reduced in diameter less than a can body part, a cap is tightened to the screw part to form a cap part, and the re-sealing of the beverage can is enabled by the cap part. An induction heating coil is disposed on the outer peripheral side of the can holding body. The can holding body comprises a can locking part, and is so formed that even when the beverage can is held in any of an upright state and an inverted state by locking the beverage can by the can locking part, the induction heating coil can be positioned only on the outer side of the side face of the can body part of the beverage can excluding the cap part.

Description

Specification

Induction heating apparatus for beverage can and induction heating method

Technical field

The present invention relates to an induction heating apparatus and an induction heating method for heating a can filled with a beverage by electromagnetic induction heating.

Background art

[0002] Currently, beverage can heat retaining devices, which are often used in combination stores and the like, are configured to accommodate a plurality of beverage cans inside a glass case etc. and to heat and maintain the temperature at a predetermined temperature. ing. Therefore, if the customer wants a warm beverage can, the heat retention device will also take out and purchase the desired beverage can. In this kind of heat retention device, the internal atmospheric temperature of the inside of the glass case and the like is raised to a predetermined temperature, and the beverage can is accommodated in the temperature atmosphere. Therefore, in order to perform heating, temperature rise and heat retention of the beverage can, it is necessary to always energize the heating device provided in the heat retention device, and since energy is consumed continuously, there is a problem that the running cost is increased. . In addition, when the temperature is maintained at a predetermined temperature, the oxidation reaction between the oxygen in the can and the components in the beverage (vitamin c, starch, etc.) is promoted (oxidized) to fill the beverage can. Deterioration of the color, smell, taste, etc. of the drink is advanced. Therefore, it is not good for sellers to display beverage cans for a long time in a warm state. Therefore, a beverage can heating device has been proposed which warms up the beverage can quickly at the point of sale, according to the customer's request.

[0003] As such a heating device, there is known a heating device including a can holder for holding a beverage can, and a heating coil for inductively heating the beverage can around the can holder to heat the can. JP-A Nos. 2002-245535, 09-097379, and 07-32597. With this type of heating apparatus, as described in JP-A-2002-245535 and JP-A-H07-325971, it is easy to put the can into the can holder and take out the can from the can holder. In some cases, the height (length) of the can holder is determined so that the upper part of the can protrudes. In this case, the height (length) of the can holder is a pair of heating and sales, in order to be able to cope with various can containers having different heights (lengths). It is set according to the lowest (shortest) can container among the can containers which become an elephant. In that case, in order to heat the can to a desired can temperature in a short time and reliably and efficiently, the height direction from the top to the bottom of the can holder as a heating body installed around the can holder In many cases, a heating coil is provided over the entire area, and the can body portion held by the can holder is often heated substantially over the entire area in the height direction. Further, as described in Japanese Patent Laid-Open No. 09-097379, an arm for discharging the beverage can is configured to eject the beverage can after heating from the can holder, and the height of the apparatus is set. In order to be able to accommodate different beverage cans of different lengths, the heating coil is arranged such that the entire can body of the high cans (lengths) of the can height (length) is heated. Then, when heating a low V (1 short) beverage can with a can height (length), the can does not exist! Heating is performed up to the portion of the can, and the heating efficiency is lowered. For this reason, the heating coil is often arranged in line with the can barrel of a (short) beverage can having a low can height (length). That is, in the beverage can induction heating device, the can height (length) is low, and (short) the can height (length) is set by the heating coil disposed in accordance with the same portion of the can of the beverage can. It is desirable to make the heating efficiency as high as possible, as it is necessary to heat the high quality (long) beverage cans.

In recent years, as a can container for a beverage can to be heated by such a beverage can induction heating device, a screw portion is formed in a mouth portion, and a screw cap made of a metal is screwed to open the container once. After that, resealable cans that can be resealed are in circulation.

Such resealable cans are used as containers for various beverages. In particular, the convenience as a container for heating and selling coffee beverages, tea beverages and the like is high. This is because the internal diameter of the mouth of the reseal can is large compared to the conventional can with the easy open end, so it is easier to drink the heated beverage, and such beverage is heated and sold. If the consumer is not able to drink all at once, the demand for resealing is due to t3⁄4.

[0006] This resealable can has an outer diameter of the can barrel mainly for the convenience of the distribution process, that is, in order to make it easy to handle the product during boxing of the product, packing, transportation, display on a product shelf at a storefront, etc. Is set to be almost the same as a conventional can. Then, as a portion connected to the can body, a mouth in which a shoulder portion which is reduced in diameter and a hemispherical shape, a screw portion and a curl portion are formed. Have a department. Then, a coating film made of a resin coating or a coating is formed on the inner surface and the outer surface, and a metal cap is attached and sold in a state in which the content is filled.

[0007] Therefore, since the resealable can can be held by the can holder of the beverage can heating device conventionally used, it is possible to heat the reseal can without particularly modifying the existing beverage can heating device. It is possible.

[0008] In the case of a beverage can induction heating apparatus as described in the above-mentioned Japanese Patent Application Laid-Open Nos. 2002-245535, 09- 097379 and 07- 32 5971, the operator erroneously recognizes the problem. When the can was placed so that the cap of the seal can was on the bottom side of the can holder (in an inverted state), the can was placed so that the cap of the reseal can came to the opening of the can holder There is a problem that the heating capacity and the heating efficiency are reduced compared to the case (fixed state). That is, in the case of the conventional can, since the can has a substantially cylindrical shape, the bottom of the can barrel can be held even when the mouth is held so that the mouth comes to the opening side of the can barrel (placement). There is no appreciable change in heating capacity and heating efficiency when held in place (inverted), whereas the resealable can has a contraction of its mouth and shoulder compared to the neck of a conventional can. Due to the large diameter, the distance between the heating coil and the can surface increases at these mouths and shoulders (see Figure 7). The configuration shown in FIG. 7 will be described later.

As the distance between the heating coil and the can surface increases, the effect of electromagnetic induction decreases and the induced current generated decreases. Therefore, when the reseal can is heated in the inverted state, the reseal can can have the desired temperature. There is a problem that the heating capacity and the heating efficiency decrease, for example, the heat can not be heated or the heating time is too long.

Further, when the resealable can is put in a state of being placed in the inverted state, the screw cap portion is heated. In this case, as described above, since the distance between the screw cap and the heating coil is large, the calorific value at which the induced current generated is small does not become large compared to the can body. Under pressure, the cap is screwed into the mouth to form a cylindrical portion or a female screw of the cap, and the cylindrical portion is filled inside the can container. Not directly in contact. Therefore, even if the heat generated by the electromagnetic induction at the outer peripheral portion of the cap portion is transmitted to the surroundings and the calorific value is not large, the temperature is likely to rise excessively. This As a result, the resin coating or coating on the inner surface of the cap is thermally deteriorated and damaged, or the frictional resistance between the outer surface of the screw and the inner surface of the cap increases to make it difficult to open the cap, or discoloring Burns are likely to occur, which tends to cause problems such as deterioration in appearance. In addition, although the screw part of the reseal cap is in direct contact with the beverage inside the container on its inner surface, it is in contact with the cap part whose temperature has risen excessively, and the part affected by the heat of the cap part Easy to receive. For this reason, there is a problem in corrosion resistance etc. due to deterioration of the flavor of the contents or thermal degradation of the resin coating or coating of the portion in contact with the cap portion. It will cause the same problems as those for the inner surface of the part.

Disclosure of the invention

[0011] The object of the present invention is to reduce the heating efficiency and the heating ability regardless of whether the re-seal can is inserted in the normal or inverted state. Also, the inner surface of the cap and the resealed screw portion of the can Excessive temperature rise on the outer surface causes heat deterioration and damage to the resin coating or coating, or the resin on the outer surface of the screw at the mouth of the reseal cap and the inner surface of the cap fuse to make it difficult to open the cap. To provide a beverage can heating apparatus and a beverage can heating method capable of heating the resealed can beverage while preventing the occurrence of problems such as discoloration or charring and appearance deterioration. It is. In this specification, the normal position refers to a state in which the bottom of the reseal can faces the bottom of the can holder of the induction heating device, and the inverted state refers to the bottom of the can holder at the bottom. On the other hand, it says the state where the cap part of the reseal can faces.

[0012] Further, the products to be sold by heating include a torrefied content such as salmon, cream stew, potage soup and the like. Such contents have a low flowability because the viscosity of the liquid portion of the contents is high and some solids are mixed. When such a highly viscous content, or a beverage can filled with a less fluid content, is heated by induction heating, the contents are not easily stirred even if induction heating is performed while rotating the can. The heat transfer from the can to the contents may cause the contents to burn on the inner surface of the can. An object of the present invention is to provide a heating device and a heating method in which the inner surface of a can does not get burnt even when the above highly viscous content is heated. In addition, the contents of the beverage can targeted by the present invention include the contents described above in addition to the contents consisting only of the liquid. It contains a mixture of liquid and solid such as salmon, cream stew, potage soup.

In addition, since the contents with high viscosity as described above are difficult to be stirred even if induction heating is performed while rotating the can, the heat generated in the can by induction heating is rapidly applied to the contents. It is difficult to communicate. Therefore, the temperature on the surface of the can becomes high, and when the heating is finished and the beverage can is taken out from the can holder, it may be hot and can not be held by bare hands, or it may be burnt. In the present invention, even when the highly viscous content is heated, the surface temperature of the can does not become excessively high, and the heating is completed and the beverage can heating device and the calorie heating method are easy to take out the beverage can from the can holder. Intended to provide.

In order to achieve the above object, an induction heating apparatus for a beverage can according to the present invention includes a can holder for holding a beverage can and an induction heating coil disposed on the outer peripheral side of the can holder. ing. The can holder has a can barrel holding portion having a predetermined height with an inner diameter equal to or larger than the barrel outer diameter of the beverage can, and a can locking portion projecting inward of the can holder. . The can inserted into the can holder is entirely made of metal, and a threaded portion is formed at the mouth reduced in diameter from the can barrel, and a cap is wound on the threaded portion to form a cap. Includes a resealable can that is formed and resealable by its cap portion. The can locking portion is in contact with the bottom of the reseal can when the reseal can is inserted into the can holder in a direction in which the can can be placed in a normal position, and the passage of the can body portion of the reseal can is performed. While being configured to block, the inward protrusion amount of the can locking portion is smaller than the difference between the outer radius of the can barrel and the outer radius of the cap. The cap portion is configured to be able to pass through when it is formed as such and when the resealable can is inserted into the can holder in a direction in which the resealable can is in an inverted state. As a result, in the heating device according to the present invention, the side surface of the reseal can may be such that the induction heating coil removes the cap even when the reseal can is held in the normal or inverted state! It is configured to be positioned so as to be located only at the outer side of, and is characterized in that

[0015] Further, in the induction heating apparatus for a beverage can of the present invention, the heating coil is relatively tightly wound between the opening side and the can locking portion side of the can barrel holding portion, and these opening sides It is wound so as to be relatively coarse at the central portion between the and the can locking portion side. Further, according to the induction heating method of a beverage can of the present invention, the induction can be arranged on the outer peripheral side of the can holder while the beverage can is rotated by the rotation mechanism in a state where the beverage can is held by the can holder. A method of inductively heating said beverage can with a coil, said beverage can comprising

The rotation of the beverage can is increased while the rotation of the beverage can is started after the rotation of the beverage can is started, and the rotation speed of the beverage can is increased. The method is characterized in that the beverage can is rotated by alternately repeating the reduction of the rotational speed.

Further, according to the induction heating method of a beverage can of the present invention, as described above, the beverage can is rotated by alternately repeating the increase and decrease of the rotation speed, and the rotation of the beverage can is started to perform force induction heating. After heating the beverage can, induction heating is stopped, and after rotating the beverage can for a predetermined time without induction heating, the rotation of the beverage can is stopped.

Further, the induction heating method of a beverage can of the present invention is characterized in that induction heating is continuously performed in addition to the above-described configuration.

According to the induction heating apparatus for a beverage can of the present invention having the above-described configuration, a conventional cylindrical beverage can or a cap is screwed to the mouth of the cylindrical configuration. Even if the can is out of alignment, it can be introduced into the can holder in such a direction that the central axis of the beverage can and the central axis of the can holder become the same. Further, since the can retaining portion is formed in the can retaining body, the can barrel can not enter the back of the can retaining portion and is retained by the can barrel retaining portion. The can barrel is efficiently heated by the installed heating coil. Further, the amount of protrusion of the can locking portion (the amount of protrusion inward in the vertical direction with respect to the inner surface of the can body holding portion) is smaller than the difference between the outer radius of the can barrel and the outer radius of the cap. As a result, when the resealable can is put into the inverted state, the cap portion passes through the can locking portion and is held below the can barrel holding portion. Therefore, the induction heating coil is not located outside the cap portion. As described above, since the induction heating coil is disposed so as to be located only on the outer side of the side surface of the reseal can except for the cap portion, it is in the normal or inverted state! It is possible to heat efficiently even if the beverage can is held in a misaligned condition. Also, the cap of the reseal can can not be heated more than necessary Therefore, even if the reseal can is inserted in an inverted state, the resin coating or the coating on the outer surface of the cap inner surface or the outer surface of the screw at the mouth is thermally deteriorated and damaged, or the outer surface of the screw at the mouth and the inner surface of the cap Or the resin film between the inner surface of the cap and the outer surface of the threaded portion of the mouth fuses together, making it difficult to open the cap, causing discoloration or burning. It is possible to avoid the occurrence of a defect such as deteriorating the appearance.

Furthermore, according to the induction heating apparatus for a beverage can of the present invention, the heating coil is wound so as to be rough at the central portion between the opening side and the can locking portion side. And even if the magnetic flux generated from the coil at the can locking part reaches the central part and interferes with the magnetic flux generated from the heating coil at the central part, the magnetic flux density becomes maximum at the central part and the center of the can trunk holder There is no excessive heat generation in the vicinity. Therefore, the resin coating or coating on the inner surface of the can barrel is thermally deteriorated, the components of the resin coating or coating are dissolved into the contents, the resin coating or coating is peeled off, or cracking occurs. From this point, problems such as deterioration of the quality of the contents can be prevented by the elution of the metal component of the can into the contents. Furthermore, the problem that the external appearance of the can is deteriorated due to the heat deterioration of the printing on the outer surface of the can, the adhesive film, the shlink film, etc. and the discoloration or peeling of the film is prevented.

[0021] Further, according to the induction heating method of the present invention, the content becomes turbulent by holding and rotating the beverage can at a predetermined angle with respect to the vertical line. It can enhance the effect of stirring things. Furthermore, since the rotation speed of the beverage can is repeatedly increased and decreased between the start of the rotation of the beverage can and the end of the rotation, the effect of stirring the contents is enhanced. That is, although the contents are also rotated by the rotation of the beverage can, the contents are rotated by the friction between the contents and the inner surface of the can in the region in contact with the inner surface of the beverage can, and the rotation is the entire content. By transmitting, the entire contents are rotated and agitated. Therefore, it takes some time for the beverage can to start rotating before the entire contents rotate at a constant rotational speed. Therefore, when the rotational speed of the beverage can is changed, the rotational speed causes a difference between the content in the vicinity of the inner surface of the beverage can and the content in the central portion of the beverage can, resulting in turbulent contents. The stirring effect is further enhanced. Therefore, even when the beverage can filled with the highly viscous content is heated, the content does not burn on the inner surface of the can. In addition, the heat generated by the can is well transmitted to the contents, so It becomes easy to take out the beverage can after the end of heating when the surface does not become excessively hot.

In the present invention, in the section in which the rotational speed is increased and in the section in which the rotational speed is reduced, in addition to the continuous increase or decrease of the rotational speed, the rotational speed becomes constant in part of the section. Oh.

Further, in the induction heating method of the present invention, rotation of the beverage can is started to start force induction heating, and after heating the beverage can, induction heating is stopped and the beverage can is not performed. Is rotated for a predetermined time, so the heat of the heated beverage can is transferred to the contents, the temperature of the surface of the beverage can is lowered, and the temperatures of the beverage can and the contents are homogenized. Therefore, after stopping the rotation of the beverage can, it becomes easy to take out the beverage can from the can holder.

Further, in the induction heating method of the present invention, it is possible to prevent the contents from burning on the inner surface of the can by intermittently performing the induction heating. That is, between the start of heating and the end of heating, the heating section in which the beverage can is inductively heated and the non-heating section not inductively heated are alternately repeated. Therefore, the heat generated in the metal part of the beverage can during induction heating is transferred to the contents during induction heating, and the temperature of the beverage can decreases, so the temperature of the beverage can rises excessively. Therefore, the contents can be prevented from sticking to the inner surface of the can. In addition, it is easy to take out the beverage can from the can holder after the completion of heating when the surface of the beverage can does not become excessively hot.

Brief description of the drawings

FIG. 1 is a view showing an example of a beverage can heating apparatus according to the present invention, and is a cross-sectional view schematically showing an internal structure in a state in which a reseal can is held in an upright state.

FIG. 2 is a cross-sectional view schematically showing a can holder that holds the resealable can in the upright position.

FIG. 3 is a cross-sectional view schematically showing a can holder that holds the resealable can in an inverted state.

FIG. 4 (a) is a partial cross-sectional view showing an example of a wound structure of a litz wire in a heating coil.

FIG. 4 (b) is a partial cross-sectional view schematically showing the number of turns and the density of turns of the litz wire in the heating coil. FIG. 5 is a view showing an example of the manner of rotation of the can holder in the induction heating apparatus for a beverage can of the present invention.

FIG. 6 is a view showing an example of a heating mode in the induction heating apparatus for a beverage can of the present invention.

FIG. 7 shows a conventional can holder and is a cross-sectional view in a state in which the reseal can is held in an inverted state.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an induction heating apparatus for a beverage can according to the present invention, and is a cross-sectional view schematically showing an internal structure of the beverage can heating apparatus in a state where the reseal can is held in an inverted state. It is. FIG. 2 is a view showing a state in which the resealable can is held in the upright position by the can holding body of the present invention, and FIG. 3 is a view showing a state in which the reseal can is held in the inverted state by the can holding body of the present invention. .

Further, FIG. 4 (a) is a partial cross-sectional view showing an example of a wound structure of a litz wire in the heating coil of the induction heating device of the beverage can according to the present embodiment, and FIG. 4 (b) is a litz wire in the heating coil. It is a fragmentary sectional view showing typically the state of the number of turns of a wire, and winding density. FIG. 5 is a view showing an example of the rotation of the can holder in the induction heating device for a beverage can according to the present embodiment, and FIG. 6 is a view showing an example of the induction heating.

In FIG. 1, a cylindrical can holding body 3 for holding a beverage can 2 such as a reseal can etc. in a box-shaped main body case 1 is inclined at a predetermined angle. A motor 4 is installed as a rotation mechanism for rotatably driving the can holder 3 under the bottom of the motor. A can body holding portion 5 having an inner diameter larger by a predetermined length than the can body outer diameter of the beverage can 2 to be held is provided on the open side of the can holder 3 and induction heating of the beverage can 2 is performed on the outer periphery thereof. Heating coil 6 is installed. The height (the length in the direction of the central axis A) of the can body holding portion 5 is a half or more of the height of the can body portion of the beverage can 2 to be applied. Length in the direction) or less is preferred. It is not preferable that the height of the can body is less than one half, because the beverage can 2 can not stably rotate when the can holding portion 5 is rotated. In order to rotate the beverage can 2 more stably, the height of the can barrel of the beverage can 2 is at least 2/3 More preferred is above. In addition, if the height of the can body holding portion 5 is equal to or more than the height of the beverage can 2, there is a problem that it is difficult to insert or take out the beverage can 2, and it is preferable!

FIGS. 4 (a) and 4 (b) show an example of the structure of the heating coil 6 used in the present invention. It is preferable to use a litz wire in which a plurality of copper wires are twisted together as a wire for passing an electric current in the heating coil 6. Further, as shown in FIG. 4 (a), the heating coil 6 can be divided into a region 6A near the opening side of the can body holding portion 5, a region 6B near the center, and a region 6C near the can locking portion 7. As shown in Fig. 4 (b), in each of the area 6A near the opening side and the area 6C near the can locking portion 7, the number of turns of the electric wire (the number of times the electric wire is wound around the outer periphery of the can barrel holding portion It is preferable to form heating coil 6 by making it densely coiled, and make the number of windings less in the region 6 B near the center, and make the coil be roughly wound. When the heating coil 6 is formed by uniformly heating the copper wire, the magnetic flux generated from the heating coil 6 on the opening side and the can locking portion 7 reaches the central portion, and the magnetic flux generated from the central heating coil 6 Since the magnetic flux density is maximized at the central portion by carrying out a dry run, a large induced current will be generated in the can body near the central portion of the can and trunk holding portion 5. As a result, more heat is generated near the center of the can body holding portion 5, so the resin coating or coating on the surface of the can body near the center is thermally deteriorated to deteriorate the quality of the contents, or the appearance of the can Cause problems that aggravate the On the other hand, by reducing the number of windings of the heating coil 6 near the center of the can body holding portion 5, the magnetic flux generated from the heating coil 6 near the center is reduced, and around the center of the can body holding portion 5. It is possible to perform homogeneous heating by suppressing excessive heating. In addition, it is possible to prevent the deterioration of the quality of the contents and the deterioration of the appearance due to the thermal deterioration of the resin coating and the coating film on the can barrel surface. In particular, when a heat shrinkable shrink label is attached to the outer surface of the can, excessive heat generation of the can near the center of the heating coil 6 and tearing of the shrink label due to this can be effectively prevented. .

Further, it is preferable to configure so that the number of windings gradually decreases toward the central portion of the heating coil 6 from the opening side or the can locking portion 7 side. According to this structure, the induction current generated in the can is homogenized, so that the above-described can near the central portion of the heating coil 6 generates an excessive amount of heat and prevents the problems associated therewith. In addition, the beverage inside can be heated uniformly. In addition, the number of windings per unit length in the direction of the can axis (the central axis of the can body) (referred to as the winding density) And it is preferable to make it large in the area | region 6c close to the can latching part 7, and to become small in the central region of the can trunk holding part 5. As shown in FIG. At this time, with respect to the winding density (TB) in the vicinity of the center, the winding density (TA) of the area 6 a is close to the opening side of the can holding portion 5 and the winding density of the area is It is preferable that the ratio (TAZTB, TCZTB) of TC be configured to be in the range of 1. 2 to 2.0. If it is smaller than 1.2, the concentration of the magnetic flux in the central part of the heating coil 6 is not sufficiently alleviated, and an effect of preventing a problem due to excessive heat generation in the can near the central part of the heating coil 6 is prevented. Is small. Also, if it is larger than 2.0, the heating of the central part may be insufficient and the heating may be nonuniform. Further, it is preferable to make the winding density of the region 6 c larger than the winding density of the region 6 a closer to the opening side of the can body holding portion 5 and closer to the can locking portion 7. With such a configuration, the lower portion of the can is relatively strongly heated, which causes convection of the content liquid, the heat transfer efficiency is high, and the beverage inside is uniformly heated. The heating coil 6 having such a configuration is not limited to the can holder 3 having the can locking portion 7, and the same effect can be obtained even when applied to the can holder 3 without a conventional can locking portion. .

At the lower end portion of the can barrel holding portion 5, the can locking portion 7 protrudes inward (toward the center direction of the can barrel holding portion 5) of the can barrel holding portion 5, and the cap of the reseal can 2 at the center It is formed as an annular flat surface in which a hole 9 of a size through which the portion 8 can pass is formed. Below that, a cap holding portion 10 having a cylindrical inner surface with an inner diameter smaller than the inner diameter of the can body holding portion 5 is provided. The can body of the resealable can 2 fed in the normal placement state is prevented from entering the cap holding portion 10 by the can locking portion 7, and the cap portion of the reseal can 2 placed in the inverted state with respect to this. Passes through the can locking portion 7 and is held by the cap holding portion 10. The inner diameter and the depth of the cap holding portion 10 are set so as to be able to hold the cap portion 8 of the resealable can 2 put in the inverted state. The heating coil 6 is not installed on the outer periphery, and the heating coil 6 is installed on the outer periphery of the can body holding portion 5. That is, in the state where the resealable can 2 is inserted and held so as to abut the can holding body 3, the heating coil 6 is outside the side of the reseal can 2 excluding the cap portion 8 regardless of the injection input direction. It is arranged to be located only at. Therefore, the cap portion 8 of the flush can 2 fed to the can holding body 3 in the inverted state is not heated more than necessary.

[0033] The can holder 3 can pass the magnetic flux and is high in heat resistance! It is preferable to use cetal resin, polyetheretherketone resin, polycarbonate resin, MC acrylic resin (registered trademark of Nippon Polypenco Co., Ltd.) resin and the like. Moreover, it is preferable that the cap holding part 10 is a structure which shields magnetic flux. With such a configuration, the magnetic flux reaching the threaded cap portion 8 held by the cap holding portion 10 is reduced, and the generation of the induced current can be suppressed to prevent unnecessary heating. Specifically, the magnetic flux can be shielded by covering the cap holding portion 10 with ferrite or the like.

Below the motor 4, a high frequency power supply device 11 for supplying a high frequency current to the heating coil 6 is provided. A part of the upper surface of the main body case 1 is a cover 12 that covers the opening of the can holder 3, and an operation panel (not shown) is installed beside the cover 12. The operation panel is provided with a start button for starting heating, a stop button for stopping the heating device halfway, and a temperature control button for adjusting the degree of heating.

[0035] When the cover 12 is opened and the beverage can 2 is put into the can holder 3, the beverage can 2 put into the can holder 3 has the upper part of the can can in order to facilitate its introduction and removal. Holds out from body 3 After closing the cover 12 again, operate the operation panel to start heating. In the present embodiment, for the sake of safety, a sensor (not shown) for detecting the open / close state of the cover 12 is installed and controlled so that the heating coil 6 is not energized when the cover 12 is open. Ru.

When heating is started, the can holder 3 starts rotating about the central axis A by driving of the motor 4, and the high frequency power supply device 11 controlled by the control unit 13 turns to the heating coil 6. Wave current is supplied, the beverage can 2 is heated for a predetermined time, and is automatically stopped. Since the beverage can 2 is induction heated while rotating about its central axis A, the beverage can 2 is uniformly heated. In addition, the effect of mixing the contents also occurs, so efficient and uniform heating can be performed. In the case of the present embodiment, in particular, the beverage can 2 is held and rotated in a state of being inclined at a predetermined angle with respect to the vertical line, the content liquid becomes turbulent and the stirring effect of the content is high. The heating can be performed uniformly and in a short time. In this case, in order to enhance the stirring effect of the contents, the inclination angle with respect to the vertical line is preferably 10 ° or more and 80 ° or less, and more preferably 30 ° or more and 60 ° or less.

FIG. 2 shows the case where the resealable can 2 is inserted into the can holding body 3 of the present invention in a state of being placed upright. Positive In the mounted state, the can body portion of the reseal can 2 is locked by the can can locking portion 7 and does not reach the cap holding portion 10. Thus, the can body is efficiently heated by the heating coil 6. The protrusion amount w of the can locking portion 7 in the present invention is preferably formed larger than the difference between the inner circumferential diameter Dh of the can barrel holding portion 5 and the outer circumferential diameter Dd of the same portion. If the amount w of the can locking portion 7 projecting inward of the can barrel holding portion 5 is smaller than the difference between the inner circumferential diameter Dh of the can barrel holding portion 5 and the outer diameter Dd of the can barrel, one of the can barrels When the side surface is held in contact with the inner surface of the can body holding portion 5, the other side surface of the can body portion may not come in contact with the can locking portion 7, which may make holding of the can unstable. is there. In particular, in the case of heating while rotating or vibrating the can, since it is necessary to hold the can stably, it is effective to increase the protrusion amount w. When the protrusion amount w is formed larger than the difference between the inner peripheral diameter Dh of the can body holding portion 5 and the can body outer peripheral diameter Dd, one side surface of the can body portion is the inner surface of the can body holding portion 5. Since the can body on the opposite side abuts on the can locking portion 7 and is securely locked to the can locking portion 7, the can barrel is stabilized. It is held by the can barrel holder 5. In particular, when the can bottom side is reduced in diameter and the diameter of the ground contact portion is smaller than the outer diameter of the can barrel, as shown in FIG. 2, the ground portion radius (0.5Ds) and the can body radius (0.5Dd). More preferably, the protrusion amount w is larger than the difference between the inner peripheral diameter Dh of the can and barrel holding portion 5 and the ground contact length Ls. With this configuration, the grounding portion is locked to the can locking portion 7, so the can barrel is stably held by the can barrel holding portion 5. In the present embodiment, when the inner diameter of the can body holding portion 5 is made larger than the can body outer diameter and the can body holding portion 5 is rotated, the resealable can 2 held is the can body holding portion 5. It is configured to roll on the inner surface of and freely rotate. In addition to the stirring effect of the content by rotation of the beverage can 2 being acquired by comprising in this way, since the internal diameter of the can-drum holding part 5 is larger than an outer diameter of the can-body, charging of the beverage can 2 and It is preferable because the removal is easy. In this case, the inner diameter of the can body holder 5 is preferably smaller than the height (length in the can central axis direction) of the beverage can to be introduced. If the inner diameter of the can body holding portion 5 is equal to or greater than the height of the beverage can, the contact area between the side surface of the beverage can and the inner surface of the can body holding portion 5 is reduced, so that the rotation of the beverage can becomes unstable. When the central axis of the beverage can is tilted and rotated with respect to the central axis of the can barrel 5 and the beverage can collides against the inner surface of the can barrel 5 and the outer surface of the beverage can is scratched, Central axis of beverage can during rotation Is rotated at a large angle with respect to the central axis of the can barrel 5 so that the central axis of the beverage can is orthogonal to the central axis of the can barrel 5, ie, in the direction of the central axis of the can barrel 5. When the side of the beverage can comes into contact with the can locking portion of the can barrel holding portion 5 and the beverage can is held in a state where the beverage can falls over, the heating of the beverage can becomes insufficient. Is not desirable because of In addition to the embodiment described above, the inner diameter of the can body holding portion 5 is substantially equal to the outer diameter of the can body so that the resealable can 2 does not roll on the inner surface of the can body holding portion 5. The inner surface of the holding portion 5 and the outer surface of the can barrel may be held in close contact with each other to rotate the can. In this case, the inner surface of the can holder 5 is preferably covered with a heat-resistant elastic material such as rubber or sponge.

[0038] Fig. 3 shows the case where the reseal can 2 is inserted in the inverted state. The protrusion amount w of the can locking portion 7 in the present invention is formed to be smaller than the difference between the outer peripheral radius (0.5 Dd) of the can body portion and the outer peripheral radius (0.5 Dc) of the cap portion 8. When the resealable can 2 is inserted in the inverted state, the cap 8 passes through the can locking portion 7 and is held below the can barrel holding portion 5, so the threaded cap 8 is unnecessary more than necessary. It will not be heated. Therefore, the resin coating or coating on the inner surface of the cap section 8 or the outer surface of the screw section is thermally deteriorated or melted and damaged, or the frictional resistance between the outer surface of the thread section and the inner surface of the cap section 8 increases to open the cap. It is possible to avoid the occurrence of problems such as making it difficult, causing discoloration or charring to make the appearance worse, and making the taste and flavor of the contents worse.

Further, since the cap portion 8 is held by the cap holding portion 10, the cap portion 8 is not heated more than necessary. Further, since the can body portion is held by the can body holding portion 5, heating can be performed with almost the same efficiency as that in the normal placement state. In the case of heating plural types of re-sealable cans 2 having different diameters of the can body by the induction heating apparatus of the present invention, the inner circumferential diameter Dh of the can barrel holding portion 5 is the outer diameter Dd of the can barrel. Is set to have the size capable of holding the largest can, and the protrusion amount w of the can locking portion 7 is such that the smallest can of the outer diameter Dd of the can barrel does not pass through the can locking portion 7 It is necessary to set so that the cap portions 8 of all kinds of re-sealed cans 2 to be fed can pass through the can-cylinder holding portion 5.

On the other hand, as shown in FIG. 7, when the resealable can 2 is held in an inverted state on the conventional can and can holding unit 30 in which V and the can and the same can only hold force as shown in FIG. With cap part 8 Since the diameter is reduced to a smaller diameter than the can barrel where the amount of diameter reduction is large, the distance between the cap 8 and the heating coil 60 is increased, the induced current generated is reduced, and the heating efficiency is significantly reduced. It will decrease.

Also, as described above, the resin coating or the coating on the inner surface of the cap 8 is melted and damaged by heating the screw cap 8, or the outer surface of the threaded portion of the mouth and the cap 8. There is a problem that the resin between the inner and outer surfaces of the container melts and makes it difficult to open the cap, causes discoloration or burnt to make the appearance worse, or the taste or flavor of the contents to be deteriorated. There is a fear.

In order to prevent the occurrence of such a problem, the heating device is provided with a sensor for detecting the inverted state of the can, and the operator is notified of normality when the can is inserted in the inverted state. It is also possible to switch back to the normal state. However, in this case, since the sensor must be provided, the cost of the device is increased, and when placed in the inverted state, there is a problem that the operator needs to put back the can and the operability deteriorates. Also, when the reseal can 2 is inserted in the inverted state, the heating coil 60 is not installed at the height equivalent to the cap 8 from the bottom side of the can holder 30, and the heating coil 60 is installed above it. Thus, it can be considered that only the can body portion of the reseal can 2 can be heated even in the inverted state. However, in this case, when the resealable can 2 is placed in a fixed position, or when heating a normal cylindrical can, the heating area becomes insufficient, resulting in insufficient heating. There is a problem that the heating capacity is reduced, for example, the time required for heating to the desired temperature is long. In the present invention, even if the reseal can 2 which does not cause such a problem is placed in an inverted state, it can be heated satisfactorily.

Further, FIG. 5 shows an example of the mode of rotation of the can holder 3 in the induction heating apparatus for a beverage can of the present invention, that is, the mode of rotation of the can in the heating method according to the present invention. In the present invention, while rotating the can holder 3 or the can, the number of rotations is repeatedly increased and decreased. The control of the rotation of the can holder 3 is performed by programming the elapsed time of the operation start force and the rotational speed at the elapsed time in advance in a computer incorporated in the control unit 13. By controlling the In FIG. 5, in the first rotation speed increase section, the rotation speed is increased from 800 rpm per minute in the first one second from the state where the can holding body 3 into which the beverage can 2 is charged stops. 2 seconds Maintain the rotational speed for the interval. In the following speed reduction zone, the speed is reduced from 800 rpm to 400 rpm for the first 0.5 seconds, and the speed is maintained for 1.5 seconds thereafter. Then, in the next increase in rotational speed, the rotational speed is increased from 400 revolutions per minute to 800 revolutions per minute during the first 0.5 seconds, and the rotational speed is maintained for the subsequent 1.5 seconds. Thereafter, in the same manner, the rotational speed increasing section and the rotational speed decreasing section are alternately repeated every two seconds, heating is performed for a predetermined time, and heating is stopped. By increasing or decreasing the rotation speed in this manner, it is possible to enhance the stirring effect of the contents, and it is possible to prevent the contents from being burned onto the inner surface of the beverage can 2. In addition, since the heat generated in the can is well transferred to the contents, the heating efficiency can be increased and the heating time can be shortened. Here, the length of the total rotation time from the start of rotation to the end of rotation, the length of time of the rotation speed increase section and the rotation speed decrease section, the rotation speed, etc. are the type of beverage can 2 to be heated and the type of contents And the viscosity of the contents, the mode of induction heating, and the like. Although not illustrated in FIG. 5, in the present embodiment, after the can temperature reaches a desired temperature and induction heating is stopped, the rotational speed increasing section and the rotational speed decreasing section are alternated for another 20 seconds. Repeatedly stop the rotation of the can holder. As a result, the heat of the can is well transferred to the contents, and the temperature on the can decreases, so it becomes easy to take out the heated beverage can.

FIG. 6 shows an example of the induction heating pattern in the present invention. In the control of the induction heating pattern, how large the output of the induction heating coil is supplied (energized) to the computer built in the control unit 13 during the elapsed time from the start of operation and the elapsed time thereof? Alternatively, whether the supply of the high frequency current is stopped (the current supply is cut off) can be programmed in advance, and the control unit 13 can control this by controlling the high frequency power supply device 11. In the present embodiment, one second after the start of rotation of the can holder 3, the first heating zone is entered, power is supplied to the induction heating coil 6, and induction heating is started. Do the heating. Thereafter, the supply of power to the induction heating coil 6 is stopped, and after a 10-second non-heating period, power is again supplied to the induction heating coil 6 to perform induction heating at 1. O kW for 10 seconds. After that, repeat 10 seconds of non-heating section and 10 seconds of heating section after crossing. In this way, induction heating is performed intermittently for a predetermined time. , Heat the beverage can 2 to the desired temperature. By intermittently conducting induction heating in this manner, it is possible to prevent the occurrence of burning on the inner surface of the beverage can 2 even if the contents having high viscosity and low fluidity are heated. Here, the induction calories to be started one second after the start of rotation of the can holder 3 is that the rotation of the beverage can 2 is unstable at the start of rotation and the rotation speed is insufficient and the contents are sufficient. Because the contents are not likely to be stirred if they are heated in such a state, the contents may be burned, so a predetermined time has elapsed since the start of rotation, and the rotation of the beverage can is stabilized. It is necessary to heat from. In addition, induction heating time force in the first heating section is longer than heating time in the subsequent heating section because heating is started from a state in which the beverage can is stored at a temperature lower than normal temperature. This is because the inner surface of the beverage can is unlikely to get burnt even if the heating time is extended. As described above, by lengthening the heating time in the first heating section, the temperature rise of the contents is promoted, so that the time from the operation start to the operation end of the beverage can induction heating device can be shortened. In the present embodiment, as described above, after the induction calories have been stopped, the beverage can 2 is further rotated for 20 seconds to stop the rotation of the can holder 3. As a result, the heat of the can is well transferred to the contents, and the temperature on the surface of the can decreases, so it becomes easy to take out the heated beverage can 2. The length of time of the power supplied to the induction heating coil 6, the heating section and the non-heating section can be appropriately determined depending on the type of the beverage can 2 to be heated, the type of the contents, the viscosity and the like. In addition, when taking out the heated beverage can 2 after completion of heating, the beverage can 2 is pushed up to the bottom of the can holder 3 except that the heated beverage can 2 is directly grasped by hand. Alternatively, the tip end of the beverage can 2 can be protruded from the can holder 3 and the protruding tip can be taken out by grasping by hand. Example

As a first embodiment of the present invention, using the induction heating apparatus for a beverage can having the can holder 3 of the above-described embodiment, the case where the reseal can 2 is in the upright state and the inverted state We compared the heating condition of.

[0046] As the resealable can 2 that generates heat, the outer diameter of the can body is about 52 mm, the contact diameter is about 46 mm, the outer diameter of the cap 8 is about 38 mm, the can height is about 124 mm, and the content is about 190 g. A steel resealable can 2 filled with a coffee beverage was used. As an example, a beverage having a cylindrical can holding body 3 for holding a resealable can 2 having a can and barrel holding portion 5, a can locking portion 7 and a cap holding portion 10 as shown in FIG. 1 In the can heating device, the inner circumferential diameter of the can barrel holding portion 5 is 55 mm, and the height of the can barrel holding portion 5 (the opening end force is also the height to the can locking portion 7) is 75 mm. Assuming that the inner diameter is 42 mm and the height of the cap holding portion 10 (height from the can locking portion 7 to the bottom) is 20 mm, the top surface of the cap portion 8 is the cap holding portion when the reseal can 2 is held in an inverted state. It was configured to abut on the bottom of 10. Also, the can holder 3 was configured such that the central axis A of the resealable can 2 to be held was inclined at an angle of 45 ° with respect to the horizontal plane. In this example, can holding body 3 was prepared using MC nylon (registered trademark of Japan Polypenco Ltd.) resin.

The protrusion amount w of the can locking portion 7 is a difference between the inner circumferential diameter of the can barrel holding portion 5 and the outer circumferential diameter of the can barrel portion of 3 mm. Since the difference with the length Ls is 6 mm, and the difference between the outer peripheral radius of the same part of the can and the outer peripheral radius of the cap portion 8 is 7 mm, it was set to 6. 5 mm. The heating coil 6 is wound around the outer periphery of the can holding portion 5 and the opening end force is also installed on the outer periphery of the range from the position force to the can locking portion 7 with a force of 5 mm. For the heating coil 6, a litz wire in which two copper wires having a diameter of 0.12 mm are twisted is used. In the area near the opening side of the can body holding part 5 and in the area near the can locking part 7, the number of turns of the litz wire is increased to make the center of the can body holding part 5 denser in the vicinity of the center. In the vicinity, the number of windings was reduced, and the heating coil 6 was formed so as to be rough with respect to the area close to the opening side and the can locking portion 7 side.

One side cross section of the heating coil 6 of the present embodiment is shown in FIG. 4 (a) and FIG. 4 (b). In the present embodiment, the configuration of the heating coil 6 is divided into three regions 6A, 6B, 6C on the opening side, the central portion, and the can locking portion side. First, in the open-side area 6A, the number of turns in which the litz wire is wound around the can barrel is 18 times. At this time, the distance in the can central axis direction of the open side area 6A where the litz wire is wound is 28 mm, and the winding density TA is 0.64 times Z mm. Furthermore, the number of turns and the winding density are closer to the center side by setting the number of turns 10 times in the section 14 mm closer to the opening side and 8 times in the section 14 mm closer to the center in the opening side area 6A. It formed to increase. Further, in the central region 6B, the lower end force of the opening region 6A also forms a predetermined gap, the number of windings is six, and the distance of the central region 6B in the can central axis direction is 12 mm. 0.5 times to Zmm. Furthermore, in the can locking portion side area 6C, a predetermined gap is opened from the lower end of the central portion side area 6B, the number of windings is 14 times, and the distance of the can locking portion side area 6C in the can central axis direction is 16 mm. Even in the can locking portion side area 6C where the winding density TC is 0.88 times Z mm, the number of windings is 6 in the 8 mm section near the center, and 8 in the section near the can locking portion. As the number of turns and the number of turns of the wire increased, the closer to the can locking portion, the number of turns was increased. The ratio of the winding density of the opening side region 6A to the winding density of the central region 6B (TAZT B) is about 1.3, and the winding density of the can locking portion side region 6C to the winding density of the central region 6B. Ratio (TCZTB) was about 1.7. The winding density of the can locking portion side region 6C is configured to be larger than the opening side region 6A, and the can lower portion is relatively strongly heated. An insulating layer 14 made of fluorine resin (for example, Teflon (registered trademark of DuPont)) having a thickness of 1 mm was formed as an insulator between the can body holding portion 5 and the heating coil 6.

Then, a high frequency wave current of 20 kHz is generated by the high frequency power supply device 11 and supplied to the heating coil 6, and induction heating is performed with an output of 2.5 kW while rotating the can holder 3 at 1000 rotations per minute. The rise of the can temperature was measured in the case of the re-sealed can 2 in the upright or inverted position using an induction heating device for the beverage can.

Further, as a comparative example, a beverage can having the same configuration as that of the embodiment except that the can retaining body 30 of only the can can barrel retaining portion 5 which does not form the can locking portion 7 and the cap retaining portion 10 is provided. Using the induction heating apparatus (see FIG. 7), the rise in can temperature was measured in the case of the re-sealable can 2 in the upright state and the inverted state, as in the example. Five cans were measured each in the upright state and the inverted state, and the average value was determined. The results are shown in Table 1.

The rise in temperature when heated for 10 seconds from a can temperature of 25 ° C. was 26 ° C. higher than the temperature before heating in either of the devices of the example and the comparative example, in the state of being placed straight. The temperature reached 51 ° C, but in the example, the temperature rise of 23.3 ° C was obtained in the case of inversion, while in the comparative example, the temperature rise of 15.5 ° C in the case of inversion. It was a powerful force.

[Table 1] Holding state Temperature rise (° c) Example Direct arrangement 26. 0

Deferred 23. 3

Comparative example

Overturned 1 5.5

In the comparative example, when held in the inverted state, a sufficient temperature rise can not be obtained with respect to the normal state, whereas in the example, the current value and the temperature rise close to the normal state even in the inverted state. It is possible to obtain a degree of heating which is a problem in practical use.

Although the embodiment and the first example of the present invention have been described above, the induction heating apparatus for a beverage can of the present invention can be appropriately modified without being limited to the above embodiment. It is.

For example, in the present embodiment, the central axis A of the reseal can 2 is configured to be held at a predetermined angle with respect to the horizontal plane so that the central axis A of the force can be perpendicular to the horizontal plane It is also possible to hold it. In this case, even when the beverage can with the smallest outer diameter is inserted among the beverage cans applied in the induction heating device for the beverage can, the can barrel reliably abuts the can locking portion and the beverage can It is preferable to set the inside diameter of the can barrel holding portion 5 and the amount of protrusion of the can locking portion so as to be locked. If the beverage can does not abut on the can locking portion and passes through the can locking portion and falls down to the lower side, the heating efficiency is reduced, and it becomes difficult to take out the beverage can. .

Further, in the present embodiment, the can locking portion 7 is formed as an annular plate having the hole 9 at the center, but a protrusion protruding inward (to the center side) of the can barrel holding portion 5 It is also possible to form as In this case, since the material of the can holder 3 can be saved, the cost of the apparatus can be reduced. Also, in this case, in order to stably hold the can, it is preferable to provide three or more projections at equal intervals in the circumferential direction. Further, in the present embodiment, the amount of protrusion w configured to be constant over the entire circumferential direction may be configured to be different in the circumferential direction. In addition, it is possible to form a tapered portion in the cap holding portion 10 with a force toward the bottom side to reduce the inner diameter. By forming in this manner, the cap portion 8 smoothly prevents the resealable can 2 inserted in the inverted state from being damaged when it comes out to the corner portion of the inner periphery of the can locking portion 7. You will be guided to

Further, in the present embodiment, when the reseal can 2 is inserted in the inverted state, the top surface of the cap portion 8 is configured to be held in contact with the bottom surface of the cap holding portion 10. It is also possible to make it hold | maintain by making the can latching part 7 contact | abut. In this case, it is preferable to provide a heat-resistant elastic body on the inner periphery of the can locking portion 7 that abuts on the shoulder portion of the resealable can 2. As a result, the can can be held in a stable posture when the can is rotated and heated so that the can does not get scratched due to the shoulder portion coming into contact with the can locking portion 7. It becomes possible.

Further, in the case where the shoulder portion is configured to be held in contact with the can locking portion 7, the cap portion 8 is formed from the locking portion of the can holder 3 without providing the cap holding portion 10. It is also possible to constitute so as to project outside. In this case, since the cap holder 10 is not formed, the can holder 3 can be easily formed, and the material cost can be reduced, so that the cost of the apparatus can be reduced. In this case, in order to configure the can holder 3 so as to rotate, the drive shaft of the motor 4 can not be joined to the bottom of the cap holder 10 and rotated, so the can holder 3 is driven to the side. An appropriate means can be used, such as bringing a roller for contact into contact and rotating it.

Further, in the present embodiment, the can holder 3 holding the reseal can 2 is configured to rotate and heat the force. The heating time such as the time required to rotate, the control of the heating coil 6, and the like are not necessarily required. By setting the conditions appropriately, it is also possible to heat the can holder 3 in a vibrating or stationary state. Further, in the present embodiment, the present invention is also applicable to a force aluminum can for steel cans. In the case of an aluminum can, since the heating efficiency by which the calorific value by induction heating is smaller is inferior to that of a steel can, it is preferable to use an appropriate means for enhancing the heating capacity and the heating efficiency. In addition, as a heating coil, a litz wire is attached to the outer part of the can body holding part, and a force coil using a coil having a circumferential cross section is not limited to a circular cross section. Having a circular or semicircular arc-shaped cross section Coils of various shapes can be applied.

Next, as a second embodiment, the heating state of the beverage can was compared between the case where the heating pattern of the present invention and the rotation pattern of the can holder were used and the case where it was not used. As the resealable can 2 to be heated, as in the first embodiment, the outer diameter of the can body is about 52 mm, the contact part diameter force S is about 46 mm, the outer diameter straightness of the cap 8 is about 38 mm, and the can height is about A steel reseal can 2 filled with about 190 g of crucible was used as the contents, using a 124 mm reseal can. Then, using the induction heating apparatus for the beverage can of the first embodiment, the beverage can was heated according to the rotation pattern of the can and barrel holder shown in FIG. 5 and the induction heating pattern shown in FIG. Specifically, the computer of the control unit 13 was programmed to control the motor 4 and the high frequency power supply 11 as follows to operate the induction heating device for the beverage can. As for the rotation of the can body holder, first, the motor 4 starts to rotate almost simultaneously with the operation start, and the rotation speed is increased to 800 rotations per minute after 1 second from the operation start, and for 2 seconds thereafter Maintain a rotational speed of 800 revolutions. Then, the rotational speed is reduced from the rotational speed of 800 revolutions per minute to the rotational speed of 400 revolutions per minute in the following 0.5 seconds, and thereafter, the rotational speed of 400 revolutions per minute is maintained for 1.5 seconds. The rotational speed is increased from the rotational speed of 400 revolutions per minute to the rotational speed of 800 revolutions per minute in the following 0.5 seconds, and the rotational speed of 800 revolutions per minute is maintained for the subsequent 1.5 seconds. From then on, the rotational speed force of 800 revolutions per minute in 0.5 seconds also reduces the rotational speed to 400 revolutions per minute, and the rotational speed is maintained at 400 revolutions per minute for the following 1.5 seconds. Increase the rotational speed from the rotational speed of 400 revolutions per minute in 0.5 seconds to the rotational speed of 800 revolutions per minute, and maintain the rotational speed of 800 revolutions per minute for 1.5 seconds thereafter The rotation speed increase interval was alternately repeated every 2 seconds, and control was performed to stop the rotation 121 seconds after the start of operation. In addition, for the high frequency power supply device 11, one second after the start of the operation of the beverage can induction heating device, that is, the rotation of the can holding body, the induction heating coil is energized and induction heating is performed for 20 seconds. After that, for 10 seconds, turn off the induction heating coil, and then for 10 seconds, turn on the induction heating coil again for induction heating. Thereafter, the non-heating section in which the induction heating coil is deenergized for 10 seconds and the heating section in which the induction heating coil is energized for 10 seconds induction heating are alternately repeated every 10 seconds, and 101 seconds after the start of operation. As the heating section ends It controlled. The total heating period until the end of the last heating period is 60 seconds, the total of the non-heating period is 40 seconds, and the total rotation time from the start of rotation to the end of rotation is 121 seconds. After 20 seconds from the end, the beverage can was rotated without induction heating, and then the rotation was stopped. The output of heating was 1. OkW, and a high frequency current of 20 kHz was generated and supplied to the heating coil 6. As a comparative example, induction heating was started one second after the start of rotation, and heating was continued until the end of heating without passing through the non-heating section. The rotation speed of the can holder was maintained until the heating was completed after increasing the rotation speed to 800 rotations per minute in 1 second from the start of the rotation. The total heating time from the start of heating to the end of heating was 60 seconds, no unheated section was provided, and the total rotation time from the start of rotation to the end of rotation was 61 seconds, and the rotation was stopped immediately after the end of heating. . The output of heating was 1.0 kW as in the example, and a high frequency current of 20 kHz was generated and supplied to the heating coil 6. A sample of 10 cans was prepared for each of the example and the comparative example, and the surface temperature of the beverage can immediately after the rotation stop was measured to confirm whether or not the inner surface of the beverage can had burnt contents.

The average value of the surface temperature of the beverage can of the second embodiment is 53.5 ° C., and even when the beverage can is held with bare hands, it is easy to prevent the can holding body from being too hot. I was able to take it out. On the other hand, the average value of the surface temperature of the beverage can of the comparative example is 67.4 ° C. It is too hot to hold the beverage can with bare hands, and the beverage can is taken out from the can holder with bare hands immediately after the heating is completed. It was difficult to

Further, according to the second example, the burning of the inner surface of the beverage can did not occur at all, whereas in the comparative example, the burning of the inner surface occurred in all the beverage cans.

The second embodiment has been described above, but the induction heating apparatus for a beverage can according to the present invention is not limited to the above-described embodiment, and the length and time length of time of the heating section and the non-heating section are different. The length of time and the number of revolutions of the heating output, the rotational speed increase section and the rotational speed decrease section can be changed as appropriate according to the shape and material of the beverage can, the type of contents, and the like.

Industrial applicability

The present invention can be used in the industrial field for producing and selling an apparatus for inductively heating cans filled with contents to be consumed and consumed warm.

Claims

The scope of the claims

[1] A threaded portion is formed at the mouth portion which is smaller in diameter than the can body portion, and a cap is crimped on the threaded portion to form a cap portion, and made of metal which can be resealed by the cap portion It has a can holder for holding a beverage can, and an induction heating device for a beverage can having an induction heating coil disposed on the outer peripheral side of the can holder;

The can holder has a can barrel holding portion having a predetermined height at an inner diameter equal to or larger than a barrel outer diameter of the beverage can, and a can locking portion projecting inward of the can holder.

The projecting amount of the can locking portion contacts the bottom of the beverage can when the beverage can is inserted into the can holder from the bottom side in a normal state, thereby preventing passage of the can body. And when the beverage can is inserted into the can holder in an inverted state from the mouth side, the protrusion amount is set to allowing the cap portion to pass through,

Even if the beverage can is held in the upright or inverted condition! / Wander, the induction heating coil is positioned only on the outer side of the beverage can except the cap portion. Beverage can induction heating device characterized in that it is arranged!

[2] The beverage can according to claim 1, wherein the amount of projection of the can locking portion is smaller than the difference between the outer peripheral radius of the can barrel and the outer peripheral radius of the cap. Induction heating equipment

[3] The induction heating device for a beverage can according to claim 1 or 2, wherein the induction heating coil is disposed only on the outer peripheral side of the can barrel holding portion in the can holder.

[4] The induction heating coil is roughened at the central portion between the opening side and the can locking portion side with respect to the opening portion side and the can locking portion side of the can body holding portion. The induction heating device for a beverage can according to claim 1 or 2, wherein the beverage can is wound.

[5] The induction heating coil may be rough at a central portion between the opening side and the can locking portion side with respect to the opening portion side and the can locking portion side of the can barrel holding portion. The induction heating device for a beverage can according to claim 3, characterized in that it is rolled.

[6] The beverage can according to claim 1 or 2, further comprising a rotation mechanism for rotating the beverage can held by the can holder about its central axis. Induction heating device.

[7] While the beverage can is held by the can holder, while rotating the beverage can by the rotation mechanism, induction of the beverage can is performed by induction heating of the beverage can by the induction heating coil disposed on the outer peripheral side of the can holder How to heat it

The beverage can is held and rotated at a predetermined angle with respect to the vertical line, and the rotation speed of the beverage can is between the start of the rotation of the beverage can and the end of the rotation. A method for inductively heating a beverage can, comprising rotating the beverage can by alternately repeating the increase of heat and the decrease of the rotation speed of the beverage can.

[8] The rotation of the beverage can is started to start the induction heating, and after the beverage can is heated, the induction heating is stopped and the beverage can is rotated for a predetermined time without induction heating. The method for induction heating of a beverage can according to claim 7, wherein the rotation of the beverage can is stopped.

[9] The method for induction heating of a beverage can according to claim 7 or 8, wherein induction heating of the beverage can is performed intermittently.

[10] The method for inductively heating a beverage can according to claim 9, wherein the first inductive heating time is longer than the subsequent inductive heating time.

11. The beverage can according to claim 9, wherein the beverage can is intermittently inductively heated by energizing the induction heating coil for each predetermined time and interrupting the energization. Heating method.

12. The beverage can according to claim 10, wherein the beverage can is intermittently inductively heated by energizing the induction heating coil at predetermined time intervals and interrupting the energization. Heating method.