Heating device and method for manufacturing tank

Abstract

The present invention provides a heating device for heating a tank body using hot air, the heating device comprising: a heating means for generating hot air; the first heating part is used for heating the tank body by using the hot air; and the second heating part is used for heating the tank body after temperature rise and heating. At least one of the first heating unit and the second heating unit may have a plurality of heating sections in which the heating conditions of the can body are different.

Description

Technical Field

[0001] This invention relates to a method for manufacturing a heating device and a tank. Background Technology

[0002] Non-patent document 1 discloses a "DI can (Drawn and Ironed Can: stretching and calendering can) drying oven using a clean heating source". Existing technical documents Non-patent literature Non-Patent Document 1: Japanese Utility Model Application Publication No. 07-032487 General Public

[0003] (The problem to be solved) This invention provides a heating device for tanks with excellent energy efficiency. Solution for solving the problem

[0004] In a first aspect of the present invention, a heating device is provided that uses hot air to heat a tank. The heating device comprises: a heating unit for generating hot air; a first heating section for heating the tank using the hot air; and a second heating section for heating the heated tank. Alternatively, at least one of the first heating section or the second heating section may have multiple heating zones with different heating conditions for the tank.

[0005] Alternatively, in the heating device described above, the second heating unit heats the tank after it has been heated to a pre-set temperature.

[0006] Alternatively, in any of the above heating devices, the heating unit may be an electric heater used to generate the hot air.

[0007] Alternatively, in any of the above-mentioned heating devices, the heating device may include multiple heating units for generating the hot air. Alternatively, each of the multiple heating zones may be provided with at least one of the multiple heating units.

[0008] Alternatively, in any of the above heating devices, at least one of the plurality of heating zones may be provided with two or more of the aforementioned heating units.

[0009] In any of the above heating devices, the temperature of at least one heating zone of the first heating unit is higher than the temperature of the heating zone of the second heating unit.

[0010] In any of the above heating devices, the air volume supplied from the heating unit in the first heating section is greater than the air volume supplied from the heating unit in the second heating section.

[0011] Alternatively, any of the above heating devices may have multiple exhaust sections, which are arranged corresponding to the multiple heating zones for discharging the hot air. Alternatively, the exhaust volume of the multiple exhaust sections may be adjusted for each of the multiple heating zones equipped with the multiple exhaust sections.

[0012] In any of the above heating devices, the exhaust volume of the last heating zone among the plurality of heating zones of the first heating unit is greater than the exhaust volume of the first heating zone among the plurality of heating zones of the first heating unit.

[0013] It is possible that, in any of the above heating devices, the exhaust volume of the first heating zone among the plurality of heating zones of the second heating unit is greater than the exhaust volume of the last heating zone among the plurality of heating zones of the second heating unit.

[0014] Alternatively, in any of the above heating devices, the plurality of heating zones may each have a circulation path, the circulation path recovers the hot air after heating the tank, and the hot air is reheated and circulated by the heating unit.

[0015] Alternatively, in any of the above heating devices, at least one of the plurality of heating zones may have a circulation path, wherein the circulation path does not discharge the hot air after heating the tank, and the hot air is reheated and circulated by the heating unit.

[0016] Alternatively, in any of the above heating devices, at least one of the plurality of heating zones may have a removal device for removing volatile components from the tank.

[0017] It can be that, in any of the above heating devices, the removal device is located in the initial heating zone of the plurality of heating zones of the second heating unit.

[0018] Alternatively, any of the above heating devices may include a cooling section located at the rear of the second heating section for cooling the tank.

[0019] In any of the above heating devices, at least one heating zone of the plurality of heating zones of the first heating unit and / or at least one heating zone of the heating zone of the second heating unit can be assembled separately from the other heating zones.

[0020] In a second aspect of the present invention, a method for manufacturing a can is provided, comprising the following stages: generating hot air for heating the can; heating the can using the hot air through a first heating unit; and heating the heated can using a second heating unit. It is possible that at least one of the first heating unit or the second heating unit has multiple heating zones with different heating conditions for the can.

[0021] The manufacturing method of the aforementioned can may include a stage in which the can is formed from a metal sheet coated with resin. Alternatively, the first heating unit and the second heating unit may heat the resin-coated can in which the resin is coated.

[0022] It should be noted that the above summary of the invention does not list all the features of the invention. Furthermore, sub-combinations of these feature groups can also constitute an invention. Attached Figure Description

[0023] Figure 1 This section outlines the structure of the manufacturing system 200. Figure 2 This section outlines the configuration of the heating device 100. Figure 3 This is an example of the configuration of the heating device 100. Figure 4A An example of a cross-section showing the heating device 100. Figure 4B An example of a cross-section showing the heating device 100. Figure 4C An example of a cross-section showing the heating device 100. Figure 5 This refers to specific examples of the upper plate 91 and the lower plate 92. Detailed Implementation

[0024] The present invention will now be described through embodiments thereof, but these embodiments do not limit the invention as defined in the claims. Furthermore, not all combinations of features described in the embodiments are necessary for the solution of the invention.

[0025] Figure 1 This section outlines the structure of the manufacturing system 200. The manufacturing system 200 includes a can manufacturing line 110 for manufacturing the can body 300. The can manufacturing line 110 includes a can body forming process 111, a pre-printing heating process 112, a printing process 113, a post-printing heating process 114, a neck forming process 115, and a packaging process 116. It should be noted that the can body 300 in this example is a cylindrical metal can, but the shape and material of the can body 300 are not particularly limited.

[0026] In the can body forming process 111, the can body structure of the can 300 is formed from the sheet-like pre-made material. The can body forming process 111 may include a stage in which the can 300 is formed from a metal sheet coated with resin. In this example, the can body forming process 111 includes a deep drawing process (CP), a body manufacturing process (BM), and a trimming process (TR).

[0027] In the deep drawing (CP) process, a circular material component is punched from a sheet of pre-rolled material to form a cup shape. A resin film may be laminated onto the pre-rolled material. In the body manufacturing (BM) process, the cup-shaped material component C1 is stretched and calendered to thin the can body, thereby forming the can body C2 by shaping the bottom of the can. It should be noted that the can body C2 can have the unwanted portion at the top of the can body cut off in the trimming (TR) process.

[0028] The pre-printing heating process 112 includes a first heat setting process (HS1) for heating the can 300. The pre-printing heating process 112 may use the heating device 100 described later to heat the can 300.

[0029] Printing process 113 includes a printing process (PR) for printing a pre-defined image on the can body 300. The image may be a mark, symbol, text, number, graphic, color, or a combination thereof, or a design composed of such combinations. There are no particular limitations on the content printed in the printing process (PR). In the printing process (PR), the main body of the can body C2 may be coated and printed.

[0030] The post-printing heating process 114 includes a second heat-setting process (HS2) for heating the can 300. The second heat-setting process (HS2) may be a process of baking and curing the printed ink onto the can 300. The post-printing heating process 114 may use the heating device 100 described later to heat the can 300. The heating method of the post-printing heating process 114 may be the same as or different from the heating method of the pre-printing heating process 112. The heating conditions of the post-printing heating process 114 may be the same as or different from the heating conditions of the pre-printing heating process 112.

[0031] The neck forming process 115 includes a necking process (Ne). In the necking process (Ne), a process is performed in which a mold is pressed onto the upper part of the can 300 to reduce the diameter of the upper part of the can 300.

[0032] Packaging process 116 packages the manufactured cans 300. Packaging process 116 may include a palletizing process (Pa) of loading the cans 300 onto pallets.

[0033] It should be noted that the manufacturing system 200 may also include a filling process for filling the tank 300 with a pre-set filler. The filling process may include a process of assembling a lid on the tank 300 filled with the filler.

[0034] Figure 2 This section outlines the configuration of the heating device 100. The heating device 100 includes a first heating section 10, a second heating section 20, a cooling section 30, and a heating unit 40.

[0035] The heating device 100 uses hot air to heat the tank 300. In this example, the heating device 100 sequentially conveys the tank 300 to the first heating section 10 and the second heating section 20 for heating. After the tank 300 is heated by the first heating section 10 and the second heating section 20, it can be cooled by the cooling section 30.

[0036] The first heating unit 10 uses hot air to heat the can body 300. The first heating unit 10 can heat the can body 300 conveyed from the can body forming process 111, or it can heat the can body 300 conveyed from the pre-printing heating process 112. The first heating unit 10 can heat the can body 300 from room temperature to a preset temperature by heating the can body 300.

[0037] The second heating unit 20 heats the can 300, which has been heated by the first heating unit 10. The second heating unit 20 can heat the heated can 300 and maintain it at a preset temperature. The second heating unit 20 can maintain the temperature of the can 300 within a preset temperature range. The second heating unit 20 can also maintain the temperature of the can 300 at a temperature not lower than a preset temperature. For example, the second heating unit 20 can maintain the temperature of the can 300 at a temperature not lower than when the can 300 was supplied to the second heating unit 20. Maintaining the preset temperature in this way can include not only a constant temperature of the can 300, but also situations where the temperature of the can 300 rises or falls.

[0038] At least one of the first heating section 10 or the second heating section 20 may have multiple heating zones S with different heating conditions for the tank 300. In this example, the first heating section 10 and the second heating section 20 each have multiple heating zones S. It should be noted that, in this specification, the term "heating zone S" can refer to any one or more heating zones of the heating device 100.

[0039] The heating conditions can be at least one of temperature, airflow, or heating time in the heating zone S. The heating conditions may include the air supply volume drawn in from outside the circulation path 60 (described later) or the exhaust volume discharged from the circulation path 60. The heating conditions may include the presence or absence of configured devices such as the removal device 70 (described later).

[0040] The first heating unit 10 may have one or more heating zones Sa with different heating conditions for the tank 300. In this specification, the term heating zone Sa may refer to any one or more heating zones that the first heating unit 10 has. In this example, the first heating unit 10 has m heating zones Sa (1) to heating zone Sa (m). m is an integer greater than or equal to 1. The first heating unit 10 may have multiple heating zones Sa, and the temperature setting of the heating unit 40 is changed according to the temperature of the tank 300 for each heating zone Sa.

[0041] In this example, the first heating section 10 sets the temperature of the heating zone Sa to be above the final reached temperature in the first heating section 10, thereby shortening the heating time. Furthermore, by shortening the heating time, the length of the first heating section 10 can be shortened. The first heating section 10 suppresses overshoot of the tank temperature by making the temperature of the latter half of the multiple heating zones Sa lower than the temperature of the first half of the heating zones Sa.

[0042] The second heating unit 20 may have one or more heating zones Sb with different heating conditions than the tank 300. In this specification, the term "heating zone Sb" may refer to any one or more heating zones possessed by the second heating unit 20. In this example, the second heating unit 20 has n heating zones Sb, from heating zone Sb(1) to heating zone Sb(n). n is an integer greater than or equal to 1. The number n of heating zones Sb in the second heating unit 20 may be the same as or different from the number m of heating zones Sa in the first heating unit 10. The number n of heating zones Sb in the second heating unit 20 may be less than or greater than the number m of heating zones Sa in the first heating unit 10.

[0043] A cooling section 30 is located at the rear of the second heating section 20 to cool the can 300. The cooling section 30 can air-cool the can 300, or it can cool the can 300 using methods other than air cooling. The cooling section 30 can cool the can 300 so that it reaches a predetermined temperature below a predetermined temperature within a predetermined time. For example, it can cool the can 300 so that it reaches a temperature below 80 degrees Celsius within 20 seconds. It should be noted that if the resin-coated can is cooled slowly, the resin may become brittle, but by using the cooling section 30 to cool the can 300, the reduction in the strength of the can 300 can be suppressed. The cooling conditions can be varied depending on the material of the resin covering the can 300.

[0044] Heating unit 40 generates hot air for heating tank 300. Heating unit 40 can be an electric heater for generating hot air. By using an electric heater as heating unit 40, it is easier to divide heating device 100 into multiple heating zones S compared to a gas-type combustion device. When using an electric heater as heating unit 40, water is not produced by combustion as in a combustion device, thus the tank 300 is easier to dry.

[0045] The heating device 100 may include multiple heating units 40. At least one heating unit 40 may be provided in multiple heating zones S. Alternatively, a single heating unit 40 may be provided for multiple heating zones S at the same temperature. In this example, the heating device 100 includes heating units 40a(1) to 40a(m) for blowing hot air into the first heating section 10 and heating units 40b(1) to 40b(n) for blowing hot air into the second heating section 20. In this specification, when referred to as heating unit 40a, it may refer to one or more heating units 40 for blowing hot air into the first heating section 10. In this specification, when referred to as heating unit 40b, it may refer to one or more heating units 40 for blowing hot air into the second heating section 20.

[0046] Heating units 40a(1) to 40a(m) are respectively provided corresponding to heating intervals Sa(1) to Sa(m) of the first heating section 10. The air volume of hot air generated by each of the heating units 40a(1) to 40a(m) can be the same or different.

[0047] Heating units 40b(1) to 40b(n) are respectively provided corresponding to heating intervals Sb(1) to Sb(n) of the second heating section 20. The air volume of hot air generated by each of the heating units 40b(1) to 40b(n) can be the same or different.

[0048] The heating device 100 can change the heating conditions of each heating zone S. The heating device 100 can change the heating conditions of each heating zone Sa of the first heating section 10, and also change the heating conditions of each heating zone Sb of the second heating section 20. By adjusting the heating conditions of each heating zone S according to the temperature of the tank 300, energy efficiency can be improved.

[0049] For example, the air volume supplied from heating unit 40a in the first heating section 10 is greater than the air volume supplied from heating unit 40b in the second heating section 20. By increasing the air volume supplied from heating unit 40a in the first heating section 10, the heating time of the tank 300 can be shortened. When the number of tanks 300 existing in the heating section S varies due to differences in the length of the heating section S, the air volume supplied from the heating unit 40 can be compared by dividing the air volume of each tank, i.e., the air volume supplied to the heating section S, by the number of tanks 300 in that heating section S.

[0050] In this example, the air volume supplied from the heating unit 40 was compared, but it could also be compared based on the air velocity blown into the tank 300, or on the circulation volume of each tank circulating in the circulation path 60 described later. The maximum air volume in the plurality of heating zones Sa of the first heating section 10 can be greater than the minimum air volume in the plurality of heating zones Sb of the second heating section 20. Furthermore, the minimum air volume in the plurality of heating zones Sa of the first heating section 10 can be greater than the maximum air volume in the plurality of heating zones Sb of the second heating section 20.

[0051] In this example, the heating device 100, by providing heating units 40 for each heating zone S, can set the temperature for each heating zone S. The heating device 100 can make the temperature of at least one heating zone Sa of the first heating section 10 higher than the temperature of the heating zone Sb of the second heating section 20. Furthermore, by dividing the first heating section 10 into multiple heating zones Sa, the heating device 100 can set the airflow of the first heating section 10 to be greater than the airflow used to maintain the temperature in the second heating section 20. This shortens the heating time of the tank 300.

[0052] The heating device 100 may also include a temperature sensor for measuring the temperature of the tank 300 in each heating interval S. Alternatively, a thermocouple may be fitted to the tank 300 to measure temperature changes. The heating device 100 can adjust the heating conditions of the tank 300 according to the measured temperature in each heating interval S.

[0053] Figure 3This is an example illustrating the configuration of the heating device 100. In this example, the first heating unit 10, the second heating unit 20, and the cooling unit 30 are arranged in the X-axis direction, and the tank 300 is conveyed in the X-axis direction. In this example, the tanks 300 are arranged at arbitrary intervals in the X-axis direction. Multiple tanks 300 may also be arranged in the Y-axis direction.

[0054] In this example, the first heating section 10 has four heating sections Sa, from heating section Sa(1) to heating section Sa(4). That is, the number m of heating sections Sa in the first heating section 10 is 4. The heating time of each of the heating sections Sa(1) to heating section Sa(4) can be the same. That is, the length of the tank body 300 in the direction of travel can be the same in each of the heating sections Sa(1) to heating section Sa(4). However, the heating time of each of the heating sections Sa(1) to heating section Sa(4) can also be different.

[0055] In this example, the second heating section 20 has two heating intervals Sb: heating interval Sb(1) and heating interval Sb(2). That is, the number n of heating intervals Sb in the second heating section 20 is 2. The heating times of heating intervals Sb(1) and heating interval Sb(2) can be the same or different. It should be noted that the number of heating intervals S in the first heating section 10 and the second heating section 20 is not limited to that in this example.

[0056] The can 300 can be a resin-coated can containing resin. The first heating unit 10 and the second heating unit 20 can heat the resin-coated can containing resin in the can 300. Here, strain may sometimes occur in the resin film covering the can 300. The strain generated in the resin film can be removed by heating performed by the heating device 100. It should be noted that when the heating device 100 is used in the post-printing heating process 114, the can 300 can be a printed can with a pre-set image printed on it.

[0057] The conveyor belt 80 transports the tanks 300 in the order of the first heating section 10, the second heating section 20, and the cooling section 30. The tanks 300 can be placed on the conveyor belt 80. The spacing of the tanks 300 in the X-axis direction can be adjusted by the speed difference between the supply speed of the tanks 300 to the heating device 100 and the conveying speed of the conveyor belt 80 of the heating device 100. The spacing of the tanks 300 in the Y-axis direction can be controlled using any distribution device so that the tanks 300 do not contact each other.

[0058] The upper plate 91 is located above the tank body 300. The upper plate 91 can be located in the first heating section 10, the second heating section 20, and the cooling section 30. The upper plate 91 will be described later.

[0059] The lower plate 92 is located below the tank body 300. The lower plate 92 can be located below the conveyor belt 80 carrying the tank body 300. The lower plate 92 can be located in the first heating section 10, the second heating section 20, and the cooling section 30. The lower plate 92 will be described later.

[0060] Here, the first heating section 10, the second heating section 20, and the cooling section 30 can be assembled separately from each other. At least one heating section Sa of the plurality of heating sections Sa of the first heating section 10 and / or at least one heating section Sb of the heating sections Sb of the second heating section 20 can be assembled separately from the other heating sections S. That is, at least one of the plurality of heating sections Sa can be assembled separately from the other heating sections Sa. Similarly, at least one of the plurality of heating sections Sb can be assembled separately from the other heating sections Sb.

[0061] By enabling the heating device 100 to be assembled separately, transportation efficiency is improved, and the installation of the device becomes easier. By setting up multiple heating units 40, the size of each unit is reduced, further improving transportation efficiency.

[0062] Figure 4A This figure shows an example of a cross-section of the heating device 100. In this example, the heating device 100 includes a heating unit 40 and an exhaust section 50 along a circulation path 60 in any heating zone S. This figure shows a YZ cross-section of the heating device 100. Multiple tanks 300 may also be arranged at arbitrary intervals in the Y-axis direction. The spacing between the tanks 300 can be controlled using any distribution device in a manner that prevents the tanks 300 from contacting each other.

[0063] A circulation path 60 is provided in the heating zone S to circulate the hot air generated by the heating unit 40. The circulation path 60 recovers the hot air after it has heated the tank 300, reheats it through the heating unit 40, and circulates it again. In this example, the circulation path 60 blows the hot air generated by the heating unit 40 to the tank 300 via the supply port 61, and recovers the hot air after it has heated the tank 300 via the exhaust port 62. The circulation path 60 can be provided in each of multiple heating zones S. By setting up the circulation path 60, the hot air after it has heated the tank 300 can be reused without the need for a heat exchanger.

[0064] Heating unit 40 is located in circulation path 60 and blows hot air from above tank 300. Heating unit 40 can be located on the side of heating zone S. That is, heating unit 40a can be located on the side of first heating section 10, and heating unit 40b can be located on the side of second heating section 20.

[0065] In this example, the can 300 is placed in an inverted state on the conveyor belt 80 with its bottom facing upwards. By supplying hot air from the heating unit 40 from above, the can 300 can be heated efficiently with its bottom, which has a higher weight ratio, facing upwards. Furthermore, by conveying it in an inverted state, the upper part of the can 300, whose diameter is larger than its bottom diameter, contacts the conveyor belt 80. This increases the contact diameter with the conveyor belt 80, making it less likely for the can 300 to tip over.

[0066] Exhaust sections 50 are provided corresponding to heating zones S, and exhaust hot air. The heating device 100 may have multiple exhaust sections 50 provided corresponding to multiple heating zones S. The exhaust volume of the multiple exhaust sections 50 can be adjusted for each of the multiple heating zones S in which the multiple exhaust sections 50 are provided. It should be noted that the exhaust sections 50 may also draw in air from the outside and supply it to the circulation path 60. The heating unit 40 may draw in air supplied from the outside in addition to the air circulating in the circulation path 60.

[0067] The exhaust section 50 can be located at any position in the circulation path 60. In this example, the exhaust section 50 is located between the heating unit 40 and the tank 300 in the circulation path 60. In this example, the exhaust section 50 is located on the side of the heating zone S, but it is not limited to this.

[0068] Here, the container 300 sometimes contains volatile components such as wax that evaporate upon heating. If the components that evaporate upon heating circulate in the circulation path 60, the concentration of the volatile components may sometimes increase. The heating device 100 in this example has an exhaust section 50, thereby allowing adjustment of the concentration of the volatile components.

[0069] The exhaust volume of the exhaust section 50 can be determined based on the amount of volatile components volatilized due to the heating of the tank 300. The exhaust volume of the exhaust section 50 can be greater for the heating zone S with a large amount of volatilization from the tank 300 than for the heating zone S with a small amount of volatilization from the tank 300. The exhaust volume of the last heating zone Sa(m) among the plurality of heating zones Sa of the first heating section 10 can be greater than the exhaust volume of the first heating zone Sa(1) among the plurality of heating zones Sa of the first heating section 10. Furthermore, the exhaust volume of the first heating zone Sb(1) among the plurality of heating zones Sb of the second heating section 20 can be greater than the exhaust volume of the last heating zone Sb(n) among the plurality of heating zones Sb of the second heating section 20.

[0070] In this example, the heating device 100 improves energy efficiency by circulating the hot air after heating the tank 300 through the circulation path 60. The heating device 100 can select whether to provide an exhaust section 50 based on the concentration of volatile components in each heating zone S, and can adjust the exhaust volume of the exhaust section 50 according to the concentration of volatile components in each heating zone S. The heating device 100 can omit the exhaust section 50 or reduce the exhaust volume in heating zones S where the temperature of the tank 300 is relatively low, such as the initial heating zone Sa(1) of the first heating section 10. By adjusting the exhaust volume in each heating zone S, the heating device 100 can improve energy efficiency.

[0071] Figure 4B Here is an example of a cross-section of the heating device 100. The heating device 100 in this example includes a heating unit 40 and a removal device 70 located in a circulation path 60 within any heating zone S.

[0072] In this example, the circulation path 60 does not discharge the hot air after heating the tank 300. Instead, the hot air is reheated and circulated by the heating unit 40. As in this example, the circulation path 60 that does not discharge can be located in at least one of the multiple heating zones S. The circulation path 60 that does not discharge can be located in the heating zone Sa of the first heating section 10 or in the heating zone Sb of the second heating section 20.

[0073] The removal device 70 removes volatile components from the tank 300. The removal device 70 can be installed in at least one of the multiple heating zones S. By installing the removal device 70, the increase in the concentration of volatile components can be suppressed even when venting is not performed in the circulation path 60. However, the removal device 70 can also be installed in the circulation path 60 where the venting section 50 is provided.

[0074] The heating device 100 may install the removal device 70 in a portion of the multiple heating zones S, or it may install the removal device 70 in all of the multiple heating zones S. In this example, the heating device 100 can suppress the cost of installing the removal device 70 and effectively remove the volatile components from the tank 300 by preferentially configuring the removal device 70 in the heating zone S where the volatile components are most desired to be removed. For example, the removal device 70 may be installed in the first heating zone Sb(1) of the multiple heating zones Sb of the second heating section 20. The removal device 70 may also be installed in the last heating zone Sa(m) of the first heating section 10.

[0075] Figure 4C Here is an example of a cross-section of the heating device 100. The heating device 100 in this example has multiple circulation paths 60 in any heating zone S. The heating device 100 in this example has two circulation paths 60: circulation path 60x and circulation path 60y.

[0076] At least one of the multiple heating zones S may be provided with two or more heating units 40. In this example, the heating device 100 uses hot air from multiple heating units 40, such as heating units 40x and 40y, to heat the tank 300 in the heating zone S. The heating device 100 may have multiple heating units 40 arranged side by side in the circulation path 60, such as heating units 40x and 40y. By setting the heating units 40 as electric heaters, it is easy to configure multiple heating units 40 for a single heating zone S.

[0077] Heating unit 40x is located in circulation path 60x. Circulation path 60x blows hot air generated by heating unit 40x to tank 300 via supply port 61x, and recovers the hot air after heating tank 300 via discharge port 62x.

[0078] Heating unit 40y is located in circulation path 60y. Circulation path 60y blows hot air generated by heating unit 40y to tank 300 through supply port 61y, and recovers the hot air after heating tank 300 through discharge port 62y.

[0079] The heating device 100 in this example can suppress temperature unevenness within a single heating zone S by using multiple heating units 40 for that zone. The heating device 100 can provide multiple heating units 40 in each of the multiple heating zones S, or it can provide multiple heating units 40 in a portion of the multiple heating zones S. Figure 4C In this process, two exhaust sections 50x and 50y are provided for a single heating zone S, but they can also be combined into a single exhaust section 50, from which branches are generated and connected to multiple heating units 40x and 40y.

[0080] Figure 5 This shows a specific example of an upper plate 91 and a lower plate 92. The upper plate 91 may have a plate portion 191 and an opening 291. The lower plate 92 may have a plate portion 192 and an opening 292.

[0081] Plates 191 and 192 can be made of metal such as iron. An opening 291 is provided in plate 191 to allow hot air generated by heating unit 40 to pass through. By providing opening 291 in the upper plate 91, hot air can be blown more evenly to the tank 300. An opening 292 is provided in plate 192 to allow hot air after heating the tank 300 to pass through.

[0082] The conveyor belt 80 can be a mesh conveyor belt. By making the conveyor belt 80 a mesh conveyor belt, hot air from the heating unit 40 can be easily circulated. The conveyor belt 80 can be a resin mesh with openings in the resin, or it can be a metal mesh. By making the conveyor belt 80 from a material with low heat capacity, energy loss when the material is cooled outside the heating section and then reheated by the heating section can be reduced. The resin mesh can reduce the height difference of the seams by bonding them together, and the tank 300 can also be placed at the seams.

[0083] The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. As can be seen from the claims, such modifications or improvements can also be included within the technical scope of the present invention.

[0084] It should be noted that the execution order of actions, processes, steps, and stages in the apparatus, systems, programs, and methods shown in the claims, description, and drawings is not specifically stated as "earlier" or "before." Furthermore, as long as the output of the previous process is not used in the later process, they can be implemented in any order. Even if the flow of actions in the claims, description, and drawings is described using terms such as "firstly," "next," etc., for convenience, it does not mean that they must be implemented in that order. Explanation of reference numerals in the attached figures

[0085] 10: First heating section; 20: Second heating section; 30: Cooling section; 40: Heating unit; 50: Exhaust section; 60: Circulation path; 61: Supply port; 62: Discharge port; 70: Removal device; 80: Conveyor belt; 91: Upper plate; 92: Lower plate; 100: Heating device; 110: Can manufacturing line; 111: Can body forming process; 112: Pre-printing heating process; 113: Printing process; 114: Post-printing heating process; 115: Neck forming process; 116: Packaging process; 191: Plate section; 192: Plate section; 200: Manufacturing system; 291: Opening; 292: Opening; 300: Can body.

Claims

1. A heating device that uses hot air to heat a tank, the heating device comprising: The heating unit generates hot air; A first heating section is used to heat the tank using the hot air; and The second heating unit is used to heat the tank body after it has been preheated. At least one of the first heating section or the second heating section has multiple heating zones with different heating conditions for the tank.

2. The heating device according to claim 1, wherein, The second heating unit heats the tank after it has been heated and maintains the preset temperature.

3. The heating device according to claim 1, wherein, The heating unit is an electric heater used to generate the hot air.

4. The heating device according to claim 1, wherein, The heating device includes multiple heating units that generate the hot air. Each of the plurality of heating zones is provided with at least one of the plurality of heating units.

5. The heating device according to claim 1, wherein, At least one of the plurality of heating zones is provided with two or more of the heating units.

6. The heating device according to claim 1, wherein, The temperature of at least one heating zone of the first heating unit is higher than the temperature of the heating zone of the second heating unit.

7. The heating device according to claim 1, wherein, The air volume supplied from the heating unit in the first heating section is greater than the air volume supplied from the heating unit in the second heating section.

8. The heating device according to claim 1, wherein, The heating device has multiple exhaust outlets, which are arranged correspondingly to the multiple heating zones for discharging the hot air. The exhaust volume is adjusted for each of the plurality of heating zones provided with the plurality of exhaust sections.

9. The heating device according to claim 8, wherein, The exhaust volume of the last heating zone among the plurality of heating zones of the first heating unit is greater than the exhaust volume of the first heating zone among the plurality of heating zones of the first heating unit.

10. The heating device according to claim 8, wherein, The exhaust volume of the first heating zone among the plurality of heating zones of the second heating unit is greater than the exhaust volume of the last heating zone among the plurality of heating zones of the second heating unit.

11. The heating device according to any one of claims 1 to 10, wherein, Each of the multiple heating zones has a circulation path, which recovers the hot air after heating the tank, and reheats and circulates the hot air through the heating unit.

12. The heating device according to any one of claims 1 to 10, wherein, At least one of the plurality of heating zones has a circulation path, which does not discharge the hot air after heating the tank, but reheats the hot air and circulates it through the heating unit.

13. The heating device according to any one of claims 1 to 10, wherein, At least one of the plurality of heating zones has a removal device for removing volatile components from the tank.

14. The heating device according to claim 13, wherein, The removal device is located in the initial heating zone of the plurality of heating zones in the second heating section.

15. The heating device according to any one of claims 1 to 10, wherein, The heating device includes a cooling section located at the rear of the second heating section, which is used to cool the tank.

16. The heating device according to any one of claims 1 to 10, wherein, At least one heating zone of the plurality of heating zones of the first heating unit and / or at least one heating zone of the heating zone of the second heating unit can be assembled separately from the other heating zones.

17. A method for manufacturing a tank, the method comprising the following stages: Generate hot air for heating the tank; The tank is heated by the hot air in the first heating section; and The tank body, after being preheated, is heated by the second heating unit. At least one of the first heating section or the second heating section has multiple heating zones with different heating conditions for the tank.

18. The method for manufacturing a tank according to claim 17, wherein, It has a stage in which the can body is formed from a metal sheet coated with resin. The first heating unit and the second heating unit heat the resin-coated can that is coated with resin in the can body.

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