Heating device and can body manufacturing system

Abstract

To suppress insufficient heating of: an image formed on a portion located downstream in a conveyance direction, of a conveyed can body; and an image formed on a portion located upstream in a conveyance direction, of a conveyed can body.SOLUTION: As illustrated in (A), a first heating device 300 is provided with a plurality of heating sources 310 arranged to be arrayed in a conveyance direction of a can body 100 on each side of a conveyance path 300R in which the can body 100 is conveyed. As the heating sources 310, a heating source that includes a light source and emits infrared ray from the light source is provided. In other words, a so-called infrared ray (IR) heater is used as the heating sources 310. In each of one side 30X and the other side 30Y, the heating sources 310 are arranged in a state of being inclined with respect to the can body conveyance direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a heating device and a can body making system. [Background technology]

[0002] Patent Document 1 discloses a process for manufacturing bottle cans, which includes a printing / overcoating and baking process, an inner surface painting and baking process, a necking process, and a screw processing process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-289381 A Summary of the Invention [Problem to be solved by the invention]

[0004] By providing a heating source on the side of the transport path of the can body, it is possible to heat the image formed on the can body that is transported along the transport path. Here, depending on the arrangement of the heating source, there is a risk that the image formed on the portion of the transported can body located downstream in the transport direction or the image formed on the portion of the transported can body located upstream in the transport direction may not be heated sufficiently. The object of the present invention is to reduce the occurrence of a situation in which an image formed on a portion of a transported can body located downstream in the transport direction, or an image formed on a portion of a transported can body located upstream in the transport direction, is insufficiently heated. [Means for solving the problem]

[0005] The heating device to which the present invention is applicable is a heating device that includes a conveying means for conveying a can body on which an image is formed along a conveying path, and a heat source that is provided on the side of the conveying path and arranged at an angle with respect to the can body conveying direction, which is the conveying direction of the can body conveyed along the conveying path. Here, a plurality of the heating sources may be provided on the sides of the transport path, the heating sources having different inclination angles with respect to the can body transport direction. In addition, one of the plurality of heat sources may face downstream in the can body transport direction, and the other heat sources may face upstream in the can body transport direction. Further, a plurality of the first heat source facing the downstream side and a plurality of the second heat sources facing the upstream side may be provided. In addition, as the one heating source facing the downstream side, a plurality of the one heating sources having different inclination angles with respect to the can body transport direction may be provided, and / or as the other heating source facing the upstream side, a plurality of the other heating sources having different inclination angles with respect to the can body transport direction may be provided. In addition, the other heating source facing the upstream side may be provided downstream of the one heating source facing the downstream side in the can body conveying direction. Moreover, the other heat source facing the upstream side may be provided adjacent to the one heat source facing the downstream side. In addition, a plurality of heating sources, including the heating source arranged at an angle, may be arranged side by side in the can body transport direction on the side of the transport path, and a flow path for passing gas supplied to the can bodies on the transport path may be provided between adjacent ones of the plurality of heating sources. The heating sources disposed at an angle with respect to the can body transport direction may be provided on both one side and the other side of the transport path. In addition, on one side and the other side of the transport path, a heat reflecting section that reflects heat from the heating source toward the transport path may be provided on the side opposite to the side on which the heating source arranged in an inclined state is provided. In addition, the can body may be formed in a cylindrical shape and have an axis, the conveying means conveys the can body with the axis aligned in a direction intersecting the extension direction of the conveying path, the heat source has an upstream end which is an end located upstream in the can body conveying direction, and a downstream end which is an end located downstream in the can body conveying direction, and when a virtual plane is imagined that is perpendicular to the axial direction of the can body conveyed by the conveying means and reaches a position opposite the heat source and crosses the can body, the heat source may be positioned so that the plane crosses the heat source, and the heat source is positioned so that one of the upstream end and the downstream end is located on the plane closer to the conveying path than the other.

[0006] Furthermore, when the present invention is considered as a can body manufacturing system, the can body manufacturing system to which the present invention is applicable is a can body manufacturing system that includes an image forming unit that forms an image on the outer surface of a can body, and a heating device that heats the image formed on the can body by the image forming unit, and that manufactures can bodies with an image formed thereon, and the heating device is configured to include any of the heating devices described above. Effect of the Invention

[0007] According to the present invention, it is possible to prevent a situation in which an image formed on a portion of a transported can body located downstream in the transport direction, or an image formed on a portion of a transported can body located upstream in the transport direction, is insufficiently heated. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 illustrates a can body manufacturing system. [Diagram 2] FIG. 1 illustrates an example of a printing device. [Diagram 3] 1A and 1B are diagrams illustrating a first heating device. [Figure 4] 1A and 1B are diagrams illustrating a transport mechanism. [Diagram 5] 1A and 1B are diagrams illustrating the relationship between the heating source and the can body. [Figure 6] FIG. 11 is a diagram showing another configuration example of the first heating device. [Figure 7] FIG. 11 is a diagram showing another configuration example of the first heating device. [Figure 8] FIG. 11 is a diagram showing another configuration example of the first heating device. [Figure 9] FIG. 11 is a diagram showing another configuration example of the first heating device. [Figure 10] FIG. 11 is a diagram showing another configuration example of the first heating device. [Figure 11] 13(A) to 13(D) are diagrams showing other configuration examples of the heat reflecting portion. [Figure 12] FIG. 11 is a diagram showing another configuration example of the first heating device. [Figure 13] 1A and 1B are diagrams illustrating the relationship between the heating source and the can body. [Figure 14] 13 is a diagram showing another arrangement relationship between the heating source and the can body. FIG. [Figure 15] 13 is a diagram showing another arrangement relationship between the heating source and the can body. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a can body manufacturing system 1 according to the present embodiment. In the can body manufacturing system 1, a can body 100 (not shown in FIG. 1) is manufactured, which is made of metal and has a cylindrical shape and a bottom, and has an image formed on its outer peripheral surface, which is an example of an outer surface. The manufactured can body 100 is filled with a beverage. The beverage is not particularly limited, and the manufactured can body 100 is filled with, for example, an alcoholic beverage such as beer or chuhai, or a soft drink (non-alcoholic beverage). After filling with the beverage, a lid member is attached to the can body 100, and a beverage can filled with the beverage is completed.

[0010] 1, the can body manufacturing system 1 is provided with a printing device 200 that prints on a can body 100. The printing device 200 of this embodiment, which functions as an image forming section, is an inkjet printing device, and forms an image on the outer peripheral surface of the can body 100 using the inkjet method. It should be noted that the printing device 200 is not limited to an inkjet printing device, but may be a printing device that performs printing using a method other than the inkjet method, such as a plate-type printing device.

[0011] The inkjet printing device 200 refers to a printing device that performs printing by ejecting ink, which is an example of paint, from an inkjet head and attaching the ink to the can body 100. Known inkjet printing methods can be used in the printing device 200. Specifically, for example, a piezo method, a thermal (bubble) method, a continuous method, etc. can be used.

[0012] Moreover, the plate-type printing device 200 refers to a printing device that performs printing using a plate. In the plate-type printing device 200, ink, which is an example of paint, is applied to the plate, and then the ink applied to the plate is transferred to the can body 100, thereby printing on the can body 100. This transfer may be performed by directly contacting the plate with the can body 100, or by placing an intermediate transfer body between the plate and the can body 100 and transferring the image to the can body 100 via this intermediate transfer body. Here, examples of printing using a plate include letterpress printing, intaglio printing, lithographic printing, and stencil printing, and any of these may be used for printing using a plate.

[0013] FIG. 2 is a diagram showing an example of a printing device 200. As shown in FIG. The printing device 200 shown in FIG. Specifically, there are provided a first inkjet head 411Y that ejects yellow ink, a second inkjet head 411M that ejects magenta ink, a third inkjet head 411C that ejects cyan ink, and a fourth inkjet head 411K that ejects black ink.

[0014] The four inkjet heads 411 are arranged so as to extend in a direction perpendicular to the moving direction of the can body 100 (a direction perpendicular to the paper surface in the figure). Also, each of the four inkjet heads 411 is arranged so as to extend along the axial direction of the can body 100 being transported. Each of the four inkjet heads 411 is disposed above the transport path of the can body 100, and ejects ink toward the can body 100 located below. In this embodiment, ink is ejected from each of the four inkjet heads 411 onto the can body 100 that is positioned below and rotates in the circumferential direction, thereby forming an image on the outer circumferential surface of the can body 100.

[0015] In this embodiment, as shown in FIG. 1, a device for performing processes other than printing processes is provided upstream of the printing device 200 in the transport direction of the can bodies 100. Specifically, in this embodiment, an uncoiler (UC), a lubricator (LU), a cupping press (CP), a body maker (BM), a trimmer (TR), and a washer (WS) are provided in this order from the upstream side in the conveying direction of the can body 100. The uncoiler (UC) unwinds the coiled aluminum sheet. The lubricator (LU) applies lubricant to the aluminum sheet. The cupping press (CP) punches out a circular blank and then draws it to form a cup-shaped material.

[0016] In the body maker (BM) that performs the forming, the cup-shaped material is subjected to drawing and ironing processes to make the peripheral wall a predetermined thickness. The bottom is then formed into a dome shape. This results in a cylindrical can body 100 that has an opening on one side and a bottom on the other side. The trimmer (TR) trims and straightens the edge portion on the upper part of the peripheral wall of the can body 100. In other words, the trimmer (TR) removes the end portion of the can body 100 on the opening side. In the washer (WS), the can body 100 is washed, lubricating oil and other deposits are removed, and a chemical coating treatment is performed as necessary.

[0017] Furthermore, a first heating device 300 is provided downstream of the printing device 200 in the transport direction of the can body 100. The first heating device 300 heats the image formed on the outer surface of the can body 100, and prints the image onto the can body 100. In other words, the first heating device 300 heats the paint made of ink that is attached to the outer surface of the can body 100, and hardens the paint. If necessary, a clear paint may be applied on top of the paint made of ink (outside the paint in the radial direction of the can body 100) and heated together with the ink to harden it. The first heating device 300 heats the image formed on the can body 100 by the printing device 200 functioning as an image forming section, and hardens the image.

[0018] On the downstream side of the first heating device 300, an inside spray (INS) and a second heating device 400 are provided. In inside spray (INS), paint is applied to the inner surface of the can body 100. In other words, in inside spray (INS), the inner surface is painted. In inside spray (INS), paint is sprayed onto the inner surface of the can body 100 to paint the inner surface. In the second heating device 400, the paint attached to the inner surface of the can body 100 is heated and baked, whereby the paint attached to the inner surface of the can body 100 is cured.

[0019] Furthermore, a smooth die necker flanger (hereinafter referred to as "necker flanger") (SDN) is provided downstream of the second heating device 400 as an example of a diameter reducing process. The necker flanger (SDN) reduces the diameter of the opening of the can body 100 and forms a flange for attaching a can lid. Through the above processes, an empty can body 100 is completed. This empty can body 100 is shipped after an inspection process (not shown) and transported to a beverage filling process (not shown). Then, in this filling process, the empty can body 100 is filled with the beverage, and a can lid is attached to the can body 100 after it has been filled with the beverage.

[0020] Although not shown, a base coater (BC) and a third heating device 500 (not shown) may be further provided between the washer (WS) and the printing device 200. In the base coater (BC), a base layer (base coat layer) is formed by applying a colored paint such as white paint to the outer peripheral surface of the can body 100. In the third heating device 500, this base layer is heated and hardened. The above-mentioned processes and devices provided in the can body manufacturing system 1 are merely examples, and some of the processes and devices may be deleted, other processes and devices may be added, or the processes may be interchanged or changed.

[0021] 3(A) and (B) are diagrams illustrating the first heating device 300. FIG. Fig. 3(A) is a top view of the first heating device 300, and Fig. 3(B) is a front view of the first heating device 300. In other words, Fig. 3(B) is a view of the first heating device 300 as viewed from the direction indicated by the arrow IIIB in Fig. 3(A). As shown in FIG. 3(A), the first heating device 300 of this embodiment is provided with a conveying mechanism 600 as an example of a conveying means that conveys a can body 100, on which an image has been formed by the printing device 200 (see FIG. 1), along a predetermined linear conveying path 300R.

[0022] Furthermore, as shown in FIG. 3(A), the first heating device 300 is provided with a plurality of heat sources 310 arranged side by side in the transport direction of the can body 100 on the side of the transport path 300R along which the can body 100 is transported. In this embodiment, a plurality of heating sources 310 are provided on both one side 30X and the other side 30Y of the transport path 300R.

[0023] In this embodiment, a heating source 310 that includes a light source and radiates infrared rays from the light source is used as an example of the heating source 310. In other words, in this embodiment, a so-called IR (Infrared Rays) heater is used as the heating source 310. When infrared rays are emitted from the light source, energy is supplied to the image formed on the outer surface of the can body 100, causing the molecules in the image to vibrate (move). This vibration creates friction between the materials that make up the image, generating heat. This heat heats the image, accelerating its hardening. The heat source 310 that radiates infrared rays is just an example, and the heat source 310 is not particularly limited, and a heat source 310 other than the heat source 310 that radiates infrared rays may be used.

[0024] As shown in FIG. 3(A), on each of one side 30X and the other side 30Y of the conveying path 300R, a flow path 320 is provided between adjacent heating sources 310 for passing gas supplied to the can body 100 on the conveying path 300R. In this embodiment, a gap 319 is provided between the heat sources 310 adjacent to each other in the can body transport direction, which is the transport direction of the can body 100. In this embodiment, the gap 319 serves as a flow path 320, and gas is supplied to the can body 100 through the gap 319 (details will be described later).

[0025] Furthermore, in this embodiment, as shown in FIGS. 3(A) and (B), a gas supply mechanism 350 is provided as an example of a gas supply means for supplying gas through a flow path 320 to the can bodies 100 on the transfer path 300R. As shown in Fig. 3(B), the gas supply mechanism 350 is composed of a heater 351, a blower 352 serving as an air source, and two supplied parts 353 to which the gas sent by the blower 352 is supplied. Fig. 3(B) shows only one of the supplied parts 353 located on one side 30X.

[0026] 3A, the supplied portion 353 is provided on each of one side 30X and the other side 30Y of the transport path 300R. The inside of the supplied portion 353 is hollow. The supply portion 353 provided on one side 30X of the conveying path 300R is disposed on the opposite side to the side on which the conveying path 300R is provided, sandwiching a plurality of heating sources 310 provided on one side 30X of the conveying path 300R. In addition, the supply section 353 provided on the other side 30Y of the conveying path 300R is also positioned on the opposite side to the side on which the conveying path 300R is provided, sandwiching a plurality of heating sources 310 provided on the other side 30Y of the conveying path 300R.

[0027] The heater 351 and the blower 352 are disposed below the transport path 300R of the can body 100, as shown in FIG. 3(B). As described above and as shown in FIG. 3(A), the supplied portions 353 are provided on both the one side 30X and the other side 30Y of the transport path 300R. As shown in FIGS. 3(A) and 3(B), each of the supply recipients 353 is provided with a gas exhaust port 353X on the side where the transfer path 300R is provided. In this embodiment, gas is discharged from this outlet 353X, and the discharged gas passes through the flow path 320 and is supplied to the can body 100 on the transfer path 300R, as shown by the arrow 3W in FIG. 3(A).

[0028] In this embodiment, a heater 351 is provided as part of the gas supply mechanism 350, and the gas supply mechanism 350 heats the gas to be supplied to the can body 100. As a result, in this embodiment, the heated gas is supplied to the can body 100. In this embodiment, air is used as the gas. In this embodiment, heated air is supplied to the can body 100. The components of the gas are not particularly limited, and a gas other than air may be supplied to the can body 100.

[0029] Furthermore, in this embodiment, as shown in FIG. 3(B), an exhaust blower 355 is provided on the ceiling of the first heating device 300, and this exhaust blower 355 exhausts the gas inside the first heating device 300 to the outside of the first heating device 300. Furthermore, in this embodiment, an intake port (not shown) for taking in gas from outside the first heating device 300 into the first heating device 300 is provided. In this embodiment, as the exhaust blower 355 exhausts gas, gas outside the first heating device 300 is supplied into the first heating device 300 through the intake port.

[0030] 4A and 4B are diagrams illustrating the transport mechanism 600. FIG. Fig. 4(A) is a top view of the transport mechanism 600, and Fig. 4(B) is a front view of the transport mechanism 600. In other words, Fig. 4(B) is a view of the transport mechanism 600 as viewed from the direction indicated by the arrow IVB in Fig. 4(A). As shown in Fig. 4B, the transport mechanism 600 is provided with a moving part 610 that moves to the right in the figure. As shown in Fig. 3A, the moving part 610 is formed in a ring shape and performs a circulating movement.

[0031] In this embodiment, a part of the moving section 610 that performs the circulating movement moves along the linear transport path 300R shown in FIG. 3(A). After moving along the linear conveying path 300R, the moving part 610 moves in a circulating manner toward the upstream side in the can body conveying direction as shown by the arrow 2C in Fig. 3(A). The moving part 610 is composed of, for example, a chain or a belt. When moving toward the upstream side in the can body conveying direction, the moving part 610 moves through the inside of the first heating device 300 as shown in Fig. 3(A). This suppresses the temperature drop of the moving part 610 compared to when the moving part 610 moves through the outside of the first heating device 300.

[0032] 4(B), the conveying mechanism 600 is provided with a plurality of can body support parts 620 that support the can bodies 100. The can body support parts 620 are attached to the moving part 610. The can body support parts 620 are provided so as to protrude upward from the moving part 610. In this embodiment, the can body support part 620 is inserted into the inside of the can body 100, whereby the can body support part 620 supports the can body 100. As the moving section 610 moves, each of the can body support sections 620 moves downstream along the conveying path 300R shown in Fig. 3(A) and then turns around and moves in a circulating manner as indicated by the arrows 2C. In Fig. 3(A), the moving section 610 is depicted as moving in a circulating manner horizontally, but it may also move in a circulating manner vertically.

[0033] The conveying mechanism 600 may be provided with a rotation mechanism that rotates each of the can body support parts 620. In this embodiment, the conveying mechanism 600 is not provided with a rotation mechanism, but if a rotation mechanism is provided, the can body 100 can be rotated in the circumferential direction of the can body 100. The rotation mechanism is realized by, for example, a motor (not shown) provided in each of the can body supports 620. When this motor is driven, the can body support part 620 rotates around a rotation axis extending along the vertical direction, and accordingly, the can body 100 supported by the can body support part 620 rotates in the circumferential direction of the can body 100.

[0034] As another example of the rotation mechanism, a contact portion 633 that comes into contact with an outer periphery 621 of a can body support portion 620 may be provided as shown in FIG. 4(A). The contact portion 633 is disposed along the movement direction (the direction of the conveying path 300R) of the can body supporting portion 620. When the contact portion 633 is used, the moving can body supporting portion 620 receives a resistance from the contact portion 633. As a result, the can body support part 620 rotates about a rotation axis extending along the vertical direction, and accordingly, the can body 100 supported by the can body support part 620 rotates in the circumferential direction of the can body 100. The rotation mechanism is not limited to the mechanism described above, and other known mechanisms may be used.

[0035] Moreover, the transport mechanism 600 is not limited to the mechanism shown in FIGS. 4(A) and 4(B), and other known mechanisms may be used. Specifically, for example, the can body 100 may be moved using a linear movement mechanism. Alternatively, for example, a drive source such as a motor may be provided on a support that supports the can body 100, and the support may move by itself, thereby moving the can body 100. Alternatively, the can bodies 100 may be moved by placing the can bodies 100 on a belt conveyor that moves in a circular manner.

[0036] In this embodiment, at the can body mounting section 361 shown in Figure 3 (A), the can body 100 transported from the upstream side is supplied to the can body supporting section 620 (see Figure 4 (B)), and the can body supporting section 620 begins to support the can body 100. The can body supporting section 620, which has started supporting the can body 100, moves downstream along the conveying path 300R (see FIG. 3(A)) formed in a straight line, in association with the movement of the moving section 610. In this embodiment, the image formed on the can body 100 is heated while the can body support part 620 moves downstream along the conveying path 300R. This promotes hardening of the image.

[0037] Then, when the can body supporting portion 620 reaches the can body removing portion 362 shown in FIG. 3(A), the can body 100 is removed from the can body supporting portion 620 by a removing mechanism (not shown). Since the can body support part 620 after the can body 100 has been removed is attached to the moving part 610, it returns to the can body attachment part 361 located upstream in the can body conveying direction.

[0038] The first heating device 300 will be further described. In this embodiment, as shown in FIG. 3(A), on each of one side 30X and the other side 30Y, a heat source 310 is disposed in a state inclined with respect to the can body conveying direction. In this embodiment, the heating sources 310 are disposed at an angle with respect to the can body conveying direction, and are provided on both one side 30X and the other side 30Y of the conveying path 300R.

[0039] In this embodiment, the arrangement of the multiple heating sources 310 provided on one side 30X and the arrangement of the multiple heating sources 310 provided on the other side 30Y are linearly symmetrical with respect to a straight line 300CL extending along the transport path 300R. In the following description, the multiple heat sources 310 arranged on one side 30X will be mainly described.

[0040] A plurality of heating sources 310 are provided on one side 30X of the transport path 300R, each of which has a different inclination angle with respect to the can body transport direction. More specifically, a plurality of heating sources 310 having different inclination angles with respect to a direction parallel to the can body conveying direction are provided on one side 30X of the conveying path 300R. Assuming a parallel straight line 98 that is parallel to the straight line 300CL extending along the conveying path 300R and passes through the upstream end portion 311 of each of the heating sources 310, in this embodiment, multiple heating sources 310 are provided with different inclination angles relative to this parallel straight line 98.

[0041] Each of the heat sources 310 has an upstream end 311 which is an end located on the upstream side in the can body transport direction, and a downstream end 312 which is an end located on the downstream side in the can body transport direction. In this embodiment, a plurality of heat sources 310 are provided, each of which has a different inclination angle with respect to a parallel line 98 passing through an upstream end 311 of the heat source 310 . In this embodiment, when one of the upstream end 311 and downstream end 312 of the heating source 310 is located closer to the conveying path 300R than the other, the heating source 310 can be said to be inclined with respect to the can body conveying direction.

[0042] On one side 30X, one of the multiple heating sources 310, designated by reference symbol 3C, faces downstream in the can body transport direction, and another heating source 310, designated by reference symbol 3D, faces upstream in the can body transport direction. Furthermore, in this embodiment, a plurality of sets of heat sources 310 each consisting of this one heat source 310 and another heat source 310 are provided.

[0043] In this embodiment, a plurality of sets of heating sources 310 are provided, each set being composed of one heating source 310 facing downstream in the can body conveying direction and another heating source 310 facing upstream in the can body conveying direction. In this embodiment, in a set of heating sources 310 consisting of two heating sources 310 adjacent to each other in the can body transport direction, the heating source 310 facing the downstream side is arranged on the upstream side, and the heating source 310 facing the upstream side is arranged on the downstream side.

[0044] In this embodiment, in the can body conveying direction, downstream of one heating source 310 designated by reference symbol 3C facing downstream, another heating source 310 designated by reference symbol 3D facing upstream is provided. More specifically, in this embodiment, another heat source 310 facing the upstream side is provided downstream of one heat source 310 facing the downstream side and adjacent to this one heat source 310. In this embodiment, one heating source 310 facing downstream and another heating source 310 facing upstream are alternately arranged in the can body conveying direction.

[0045] The inclination angle of one heating source 310 with respect to the can body transport direction is, for example, 15°, and the inclination angle of the other heating source 310 with respect to the can body transport direction is, for example, −15°. The inclination angle of the heat source 310 with respect to the can body conveying direction is not particularly limited, and other examples of the inclination angle include 30°, −30°, 45°, and −45°.

[0046] Furthermore, in this specification, for the heating source 310 arranged on one side 30X, the inclination angle of the heating source 310 in the clockwise direction with respect to the parallel straight line 98 is defined as a positive inclination angle, and the inclination angle of the heating source 310 in the counterclockwise direction with respect to the parallel straight line 98 is defined as a negative inclination angle. In this case, one heating source 310, designated by reference symbol 3C, is positioned with a positive tilt angle, and the other heating source 310, designated by reference symbol 3D, is positioned with a negative tilt angle.

[0047] Furthermore, in this specification, for the heating source 310 arranged on the other side 30Y, the inclination angle of the heating source 310 in the counterclockwise direction with respect to the parallel straight line 98 is defined as a positive inclination angle, and the inclination angle of the heating source 310 in the clockwise direction with respect to the parallel straight line 98 is defined as a negative inclination angle. In this embodiment, two heating sources 310, indicated by reference characters 3C and 3E in FIG. 3A and arranged symmetrically with respect to the transport path 300R, both have positive inclination angles. Moreover, the two heating sources 310 denoted by reference characters 3D and 3F in FIG. 3A, which are disposed symmetrically with respect to the transport path 300R, both have negative inclination angles.

[0048] In this embodiment, when the can body 100 is transported, the can body 100 is transported with the axial direction of the cylindrical can body 100 aligned in a direction intersecting the can body transport direction. More specifically, in this embodiment, when the can body 100 is transported, the can body 100 is transported with the axial direction of the cylindrical can body 100 aligned in a direction perpendicular to the can body transport direction.

[0049] It is assumed that the can body 100 being conveyed is located at the position indicated by the reference symbol 3S in FIG. 3(A). In this case, in this embodiment, an image formed on a portion 100A of the can body 100 located downstream in the conveying direction (hereinafter referred to as the "downstream portion 100A") is irradiated with infrared rays from another heating source 310 facing upstream and provided on each of one side 30X and the other side 30Y. In this case, infrared rays are irradiated onto the image formed on the portion 100B of the can body 100 located upstream in the conveying direction (hereinafter referred to as the "upstream portion 100B") from a single heating source 310 facing downstream, the single heating source 310 being provided on each of the one side 30X and the other side 30Y. This promotes hardening of the image formed in the downstream portion 100A and the image formed in the upstream portion 100B compared to a configuration in which only a heating source 310 having an inclination angle of 0° with respect to the can body transport direction is provided.

[0050] In the above, a case has been described in which in a pair of heating sources 310 consisting of the above-mentioned two heating sources 310 adjacent to each other in the can body transport direction, the heating source 310 facing the downstream side is arranged on the upstream side, and the heating source 310 facing the upstream side is arranged on the downstream side. However, this is not limited to the above, and in a set of two heat sources 310, the heat source 310 facing the downstream side may be arranged on the downstream side, and the heat source 310 facing the upstream side may be arranged on the upstream side.

[0051] 5(A) and (B) are diagrams illustrating the relationship between the heat source 310 and the can body 100. FIG. Figure 5(A) shows the state when the axis 119 of the can body 100 is located on an orthogonal plane 59, which is a plane perpendicular to the can body transport direction and passes through the midpoint 317 of a heating source 310 arranged on one side 30X. Here, a virtual orthogonal plane 59 is assumed that is perpendicular to the can body transport direction and passes through a midpoint 317 of the heat source 310. The midpoint 317 of the heat source 310 refers to the midpoint 317 of a line connecting the upstream end 311 and the downstream end 312 of the heat source 310.

[0052] In this embodiment, when the axis 119 of the can body 100 conveyed from the upstream side is positioned on the orthogonal plane 59, the state shown in Fig. 5(A) is reached. In the state shown in Fig. 5(A), the axis 119 of the can body 100 is aligned with the orthogonal plane 59. In this state shown in Figure 5 (A), the distance between the axis 119 of the can body 100 and the upstream end 311 of the heating source 310 is different from the distance between the axis 119 of the can body 100 and the downstream end 312 of the heating source 310. Specifically, the distance between the axis 119 of the can body 100 and the upstream end 311 of the heat source 310 is smaller than the distance between the axis 119 of the can body 100 and the downstream end 312 of the heat source 310 .

[0053] 5(B) is a diagram showing a state in which the axis 119 of the can body 100 is located on an orthogonal plane 59 that is a plane perpendicular to the can body conveying direction and passes through a midpoint 317 of another heating source 310 arranged on one side 30X. Even in the state shown in FIG. 5(B), the axis 119 of the can body 100 is aligned along the orthogonal plane 59. Even in this state shown in Figure 5 (B), the distance between the axis 119 of the can body 100 and the upstream end 311 of the heating source 310 is different from the distance between the axis 119 of the can body 100 and the downstream end 312 of the heating source 310. Specifically, the distance between the axis 119 of the can body 100 and the upstream end 311 of the heat source 310 is greater than the distance between the axis 119 of the can body 100 and the downstream end 312 of the heat source 310 .

[0054] 13(A) and (B) are diagrams illustrating the relationship between the heat source 310 and the can body 100. FIG. FIG. 13(A) is a diagram showing one heating source 310 arranged on one side 30X and the can body 100 when viewed from the direction indicated by arrow XIIIA in FIG. 5(A). FIG. 13(B) is a diagram showing the state when another heating source 310 arranged on one side 30X and the can body 100 are viewed from the direction indicated by the arrow XIIIB in FIG. 5(B).

[0055] In FIG. 13(A), an imaginary plane 13Z is assumed to be perpendicular to the axial direction of the can body 100 and crosses the can body 100, passing through the center of the can body 100 in the axial direction. In this embodiment, the can body 100 is formed in a cylindrical shape and has an axis 119 . In this embodiment, as shown in FIG. 13(A), the can body 100 is transported with the axis 119 of the can body 100 aligned in a direction intersecting the extension direction of the transport path 300R. More specifically, in this embodiment, the can body 100 is transported with the axis 119 of the can body 100 aligned in a direction perpendicular to the extension direction of the transport path 300R.

[0056] 13(A) shows the state when the can body 100 being transported by the transport mechanism 600 reaches a position facing one of the heating sources 310. More specifically, it shows the state when the axis 119 of the can body 100 is located on the above-mentioned orthogonal plane 59 (see FIG. 5(A)). In this embodiment, as shown in Figure 13(A), when imaginary plane 13Z is imagined which is perpendicular to the axial direction of the can body 100, crosses the can body 100, and passes through the center of the can body 100 in the axial direction, one heating source 310 is positioned so that this plane 13Z crosses the one heating source 310.

[0057] Furthermore, in this embodiment, the one heat source 310 is disposed such that the upstream end 311 and the downstream end 312 of the one heat source 310 are positioned on the imaginary plane 13Z. In this embodiment, a virtual plane 13Z is also shown in Figure 5(A), but in this embodiment, as shown in Figure 5(A), a single heating source 310 is positioned on the virtual plane 13Z such that an upstream end 311 of the single heating source 310 is located closer to the conveying path 300R than a downstream end 312.

[0058] 14 and 15 are diagrams showing other positional relationships between the heat source 310 and the can body 10. In FIG. Here, for example, as shown in FIG. 14, it is assumed that the can body 10 is transported with the axis 119 of the can body 10 aligned along the transport path 300R. In this case, an imaginary plane 13Z that is perpendicular to the axial direction of the can body 100, crosses the can body 100, and passes through the center of the can body 100 in the axial direction crosses one heating source 310. In this case, however, the upstream end 311 and the downstream end 312 of one heat source 310 are not positioned on this imaginary plane 13Z.

[0059] Also, for example, the can body 100 may be transported in the state shown in FIG. In this state shown in FIG. 15, the axis 119 of the can body 100 is aligned in a direction intersecting the extension direction of the transfer path 300R, but the imaginary plane 13Z does not cross one heating source 310. In contrast, in the configuration examples shown in Figures 5(A) and 13(A), the plane 13Z crosses the one heating source 310, and the upstream end 311 and downstream end 312 of the one heating source 310 are located on this plane 13Z.

[0060] Further explanation will be given with reference to FIG. FIG. 13(B) shows a state where the can body 100 has been transported by the transport mechanism 600 and has reached a position facing another heating source 310. More specifically, in this case too, the state is shown where the axis 119 of the can body 100 is positioned on the orthogonal plane 59 shown in FIG. 5(B). Also in Figure 13 (B), if we imagine a virtual plane 13Z that is perpendicular to the axial direction of the can body 100, crosses the can body 100, and passes through the center of the can body 100 in the axial direction, this plane 13Z will cross another heating source 310.

[0061] Furthermore, in this case, an upstream end 311 and a downstream end 312 of another heat source 310 are positioned on the imaginary plane 13Z. Also, as shown in FIG. 5B, on the imaginary plane 13Z, the downstream end 312 of the other heat source 310 is located closer to the transport path 300R than the upstream end 311.

[0062] FIG. 6 is a diagram showing another example of the configuration of the first heating device 300. In FIG. 6, the arrangement of the multiple heating sources 310 arranged on one side 30X and the arrangement of the multiple heating sources 310 arranged on the other side 30Y are symmetrical with respect to a straight line 300CL extending along the transport path 300R. Here again, the explanation will be centered on the heating sources 310 arranged on one side 30X. In the above configuration example shown in Figure 3, all of the heating sources 310 are inclined with respect to the can body transport direction, but it is not necessary to incline all of the heating sources 310, and it is also possible to provide heating sources 310 with an inclination angle of 0° with respect to the can body transport direction.

[0063] In this configuration example shown in Figure 6, a heating source 310 indicated by reference symbol 5C, which has an inclination angle of 0° with respect to the can body transport direction, is provided between one heating source 310 indicated by reference symbol 5A, which is arranged at an inclination, and another heating source 310 indicated by reference symbol 5B, which is also arranged at an inclination. In other words, in this configuration example, a heating source 310 is arranged in a slanted manner and between another heating source 310 also arranged in a slanted manner, the heating source 310 being arranged in a manner aligned with the can body transport direction. In the configuration example shown in Figure 6, a heating source 310 with an inclination angle of 0° relative to the can body transport direction is provided between the downstream end 312 of one heating source 310 and the upstream end 311 of another heating source 310.

[0064] In the case of this configuration example shown in FIG. 6, the output of the heat source 310 having an inclination angle of 0° with respect to the can body conveying direction may be made larger than the output of one heat source 310 and the output of the other heat source 310. In this configuration example, the heating source 310 having an inclination angle of 0° with respect to the can body conveying direction is provided farther from the conveying path 300R than the other heating sources 310. In this case, the image is less likely to be hardened by the heating source 310, which has an inclination angle of 0° with respect to the can body transport direction. By increasing the output of the heating source 310, which has an inclination angle of 0° with respect to the can body transport direction, the occurrence of this problem of the image being less likely to be hardened can be suppressed.

[0065] FIG. 7 is a diagram showing another example of the configuration of the first heating device 300. In FIG. The heating source 310 having an inclination angle of 0° with respect to the can body transport direction may be provided closer to the transport path 300R than the downstream end 312 of one heating source 310 and the upstream end 311 of the other heating source 310, as shown in Figure 7. In this case, the above-mentioned problem of the image not being easily cured can be prevented without increasing the output of the heat source 310, which has an inclination angle of 0° with respect to the can body conveyance direction.

[0066] FIG. 8 is a diagram showing another configuration example of the first heating device 300. In FIG. In this configuration example, the arrangement of the multiple heating sources 310 arranged on one side 30X and the arrangement of the multiple heating sources 310 arranged on the other side 30Y are symmetrical with respect to the straight line 300CL extending along the conveying path 300R. Here again, the description will be centered on the multiple heat sources 310 arranged on one side 30X.

[0067] In this configuration example shown in FIG. 8, a plurality of single heating sources 310 facing downstream in the can body transport direction are provided on one side 30X, the single heating sources 310 having different inclination angles with respect to the can body transport direction. Furthermore, in this configuration example, a plurality of other heating sources 310 facing the upstream side in the can body conveying direction and having different inclination angles with respect to the can body conveying direction are provided on one side 30X.

[0068] Specifically, in this configuration example, on one side 30X, there are provided two heating sources 310 facing downstream: one heating source 310 indicated by reference symbol 7A having an inclination angle of 15° with respect to the can body transport direction, and one heating source 310 indicated by reference symbol 7B having an inclination angle of 30° with respect to the can body transport direction. Furthermore, in this configuration example, a heat source 310, designated by reference symbol 7C, having an inclination angle of 0° with respect to the can body conveying direction is provided on one side 30X.

[0069] Furthermore, in this configuration example, on one side 30X, other heating sources 310 facing upstream are provided, including another heating source 310 indicated by symbol 7D having an inclination angle of -30° with respect to the can body transport direction, and another heating source 310 indicated by symbol 7E having an inclination angle of -15° with respect to the can body transport direction. In this manner, a plurality of heating sources 310 may be provided, each of which faces the downstream side and the upstream side, with different inclination angles relative to the can body conveying direction.

[0070] In this configuration example shown in Figure 8, multiple heating sources 310 are provided, with one heating source 310 facing the downstream side and another heating source 310 facing the upstream side, each of which has a different inclination angle with respect to the can body transport direction. However, this is not limited to the above, and for one heating source 310 facing the downstream side and one of the other heating sources 310 facing the upstream side, only one type of heating source 310 having an inclination angle with respect to the can body transport direction may be provided. In other words, it is not necessary to provide multiple heating sources 310 with different inclination angles for each of the one heating source 310 facing downstream and the other heating source 310 facing upstream, and multiple heating sources 310 with different inclination angles may be provided for only one of the one heating source 310 facing downstream and the other heating source 310 facing upstream.

[0071] FIG. 9 is a diagram showing another example of the configuration of the first heating device 300. In FIG. In this configuration example, a plurality of heating sources 310 are provided on one side 30X of the transport path 300R, similar to the configuration example shown in Fig. 3. Also, in this configuration example, a heat reflecting unit 390 is provided on the other side 30Y of the transport path 300R. In this configuration example, a heat reflecting section 390 that reflects heat from the heating source 310 toward the conveying path 300R is provided on one side 30X and the other side 30Y of the conveying path 300R opposite the side on which the heating source 310 is provided.

[0072] As in the above, a plurality of heating sources 310 are provided and arranged side by side in the can body conveying direction. Furthermore, as in the above, a flow path 320 is provided between adjacent heating sources 310. Furthermore, in the case of multiple heating sources 310, as in the configuration example shown in Figure 3(A), one heating source 310 among the multiple heating sources 310 faces downstream in the can body transport direction, and the other heating sources 310 face upstream in the can body transport direction.

[0073] In addition, on one side 30X, as in the configuration example shown in FIG. 8, multiple heating sources 310 facing downstream and having different inclination angles, and multiple heating sources 310 facing upstream and having different inclination angles may be provided. Also, a heat source 310 may be provided on one side 30X, with the angle of 0° relative to the can body conveying direction, as in the configuration examples shown in each of FIGS.

[0074] The heat reflecting section 390 (see FIG. 9) reflects heat from the heating source 310 provided on one side 30X toward the transport path 300R. The heat reflecting section 390 is configured of a so-called mirror and has a function of reflecting light, and reflects infrared rays from the heating source 310 in this embodiment. The heat reflecting portion 390 is formed in a flat shape, and is disposed along the can body conveying direction.

[0075] A plurality of heat reflecting sections 390 are provided and are arranged side by side in the can body conveying direction. Furthermore, in this configuration example, a flow path 320 for passing gas supplied to the can body 100 on the conveying path 300R is provided between adjacent heat reflecting portions 390. This flow path 320 is formed by a gap 319 existing between the heat reflecting portions 390.

[0076] In this configuration example, on one side 30X of the transport path 300R, gas is supplied to the can bodies 100 on the transport path 300R through a flow path 320 provided between adjacent heating sources 310, as described above. On the other hand, on the other side 30Y of the transport path 300R, gas is supplied to the can bodies 100 on the transport path 300R through a flow path 320 provided between the heat reflecting sections 390 adjacent to each other. In addition, in this configuration example, the image formed on the can body 100 is heated by infrared rays directed directly from the heating source 310 to the can body 100 and infrared rays directed from the heat reflecting portion 390 to the can body 100 .

[0077] FIG. 10 is a diagram showing another configuration example of the first heating device 300. In FIG. The first heating device 300 shown in FIG. 10 has the same configuration as that shown in FIG. In this configuration example, one of the multiple heat reflecting sections 390 faces downstream in the can body transport direction, and the other heat reflecting sections 390 face upstream in the can body transport direction.

[0078] Specifically, in this configuration example, a heat reflecting section 390 facing downstream in the can body transport direction is provided at a position opposite a heating source 310 facing downstream in the can body transport direction, which is provided on one side 30X. Further, another heat reflecting portion 390 facing the upstream side in the can body conveying direction is provided at a position opposite to another heating source 310 facing the upstream side in the can body conveying direction provided on one side 30X. As shown in each of Figures 6 to 8, a heating source 310 having an inclination angle of 0° with respect to the can body transport direction may be provided on one side 30X. In this case, for example, a heat reflecting section 390 having an inclination angle of 0° with respect to the can body transport direction may be provided opposite this heating source 310.

[0079] 11(A) to (D) are diagrams showing other configuration examples of the heat reflecting portion 390. In FIG. In the above, an example has been described in which the heat reflecting portion 390 is formed in a flat shape. However, this is not limited thereto, and the heat reflecting portion 390 may be formed so as to be convex toward the transport path 300R, as shown in FIGS. 11(A) and (B). 11(C) and (D), the heat reflecting portion 390 may be provided with projections and recesses so that the heat reflecting portion 390 diffuses infrared rays. The heat reflecting section 390 shown in Figures 11(A) and (C) is disposed so that the inclination angle with respect to the can body conveying direction is 0°. The heat reflecting section 390 shown in Figures 11(B) and (D) is disposed so that it is inclined with respect to the can body conveying direction.

[0080] FIG. 12 is a diagram showing another configuration example of the first heating device 300. In FIG. The heating source 310 arranged opposite one heating source 310 provided on one side 30X does not need to face in the same direction as the one heating source 310, and may be arranged to face in the opposite direction to the direction in which the one heating source 310 faces, as in the configuration example shown in FIG. 12. In other words, the heating sources 310 positioned opposite each other across the transport path 300R do not need to face the same common direction, and as shown in FIG. 12, the heating sources 310 positioned opposite each other across the transport path 300R may face different directions.

[0081] When one or more heating sources 310 arranged at a first inclination angle are provided on one side 30X, it is preferable to provide other heating sources 310 on the other side 30Y in the same number as the one heating source 310 arranged at the first inclination angle, the other heating sources 310 having an inclination angle equal to the first inclination angle.

[0082] In the configuration example shown in FIG. 12, for example, if the heating source 310 indicated by the symbol 11A and arranged on one side 30X is one heating source 310 arranged at a first inclination angle, in this configuration example shown in FIG. 12, three heating sources 310 arranged at this first inclination angle are provided on one side 30X. In the configuration example shown in FIG. 12, three other heating sources 310 indicated by the symbol 11B are provided on the other side 30Y and arranged at this first inclination angle, and the same number of other heating sources 310 as the one heating source 310 arranged at the first inclination angle are provided on the other side 30Y.

[0083] In this case, the amount of heat supplied to the can body 100 from a heating source 310 arranged at a first inclination angle on one side 30X is equal to the amount of heat supplied to the can body 100 from another heating source 310 arranged at a first inclination angle on the other side 30Y. In this case, uneven hardening of the image formed on the can body 100 is less likely to occur, compared to when the amounts of heat are not equal.

[0084] In addition, in the configuration example shown in FIG. 12, if the heating source 310 indicated by the symbol 11C arranged on one side 30X is one heating source 310 arranged at a second inclination angle, in this configuration example shown in FIG. 12, three heating sources 310 arranged at the second inclination angle are provided on one side 30X. In the configuration example shown in Figure 12, three other heating sources 310 indicated by the symbol 11D are provided on the other side 30Y and arranged at this second inclination angle, and the same number of other heating sources 310 as the one heating source 310 arranged at the second inclination angle are provided on the other side 30Y.

[0085] In this case, the amount of heat supplied to the can body 100 from a heating source 310 arranged at a second inclination angle on one side 30X is equal to the amount of heat supplied to the can body 100 from another heating source 310 arranged at a second inclination angle on the other side 30Y. In this case, uneven hardening of the image formed on the can body 100 is less likely to occur, compared to when the amounts of heat are not equal.

[0086] When multiple types of heat sources 310 having different inclination angles are arranged on one side 30X, it is preferable to arrange the same multiple types of heat sources 310 on the other side 30Y as well. In this case, it is preferable that the number of each type of heat sources 310 arranged on the other side 30Y is the same as the number of each type of heat sources 310 arranged on one side 30X. This makes the amount of heat supplied to the can body 100 from one side 30X equal to the amount of heat supplied to the can body 100 from the other side 30Y, making it less likely that the image will be cured unevenly.

[0087] It is not essential that the arrangement of the multiple heating sources 310 provided on one side 30X and the arrangement of the multiple heating sources 310 provided on the other side 30Y be symmetrical with respect to a straight line 300CL extending along the transport path 300R. It is sufficient that a heating source 310 is provided on each of the one side 30X and the other side 30Y so that the total amount of heat supplied to the can body 100 from one side 30X is equal to the total amount of heat supplied to the can body 100 from the other side 30Y, and it is not essential that the arrangement be linearly symmetrical.

[0088] In other words, it is sufficient that the heating source 310 is provided on each of the one side 30X and the other side 30Y so that the amount of energy of infrared rays irradiated to the can body 100 from one side 30X is equal to the amount of energy of infrared rays irradiated to the can body 100 from the other side 30Y, and it is not essential that the arrangement be linearly symmetrical.

[0089] As described above, if the same type of heating source 310 as that arranged on one side 30X is arranged on the other side 30Y, and the number of each type of heating source 310 installed on one side 30X is the same as that on the other side 30Y, the amount of infrared energy irradiated to the can body 100 from one side 30X will be equal to the amount of infrared energy irradiated to the can body 100 from the other side 30Y.

[0090] In consideration of the manufacture and design of the first heating device 300, it is preferable to provide at least one set of heating sources 310 that are axially symmetrical with respect to the transport path 300R among the multiple heating sources 310 provided in the first heating device 300. More preferably, in all of the pairs of heating sources 310 arranged in a positional relationship in which they face each other across the transport path 300R, the heating sources 310 constituting each pair are arranged in a linearly symmetric relationship across the transport path 300R.

[0091] In the configuration examples shown in FIG. 3 and FIGS. 6 to 8, in all the groups, the heat sources 310 constituting each group are arranged in line symmetry with respect to the transfer path 300R. When the heating sources 310 constituting each group are arranged in a linearly symmetrical relationship across the transport path 300R in all groups, the manufacture and design of the first heating device 300 becomes easier than when the heating sources 310 constituting each group are arranged in an asymmetrical relationship.

[0092] (others) Although the first heating device 300 has been described above, the second heating device 400 (see FIG. 1) and the third heating device 500 (not shown) may also be configured in the same manner as the first heating device 300. [Explanation of symbols]

[0093] 1...can body manufacturing system, 30X...one side, 30Y...other side, 200...printing device, 300...first heating device, 300R...transport path, 310...heat source, 320...flow path, 390...heat reflecting section, 600...transport mechanism

Claims

1. A conveying means for conveying the can body on which the image is formed along a conveying path; A heating source is provided on the side of the conveying path and is arranged in a tilted state with respect to a can body conveying direction, which is a conveying direction of the can body conveyed on the conveying path; A heating device comprising:

2. The heating device according to claim 1 , wherein a plurality of the heat sources are provided on the sides of the transport path, the heat sources being inclined at different angles with respect to the can body transport direction.

3. The heating device according to claim 2 , wherein one of the plurality of heat sources faces downstream in the can body transport direction, and the other heat sources face upstream in the can body transport direction.

4. The heating device according to claim 3 , wherein a plurality of the first heat source facing the downstream side and a plurality of the second heat sources facing the upstream side are provided.

5. The heating device described in claim 3, wherein a plurality of the one heating sources facing the downstream side are provided, each having a different inclination angle with respect to the can body transport direction, and / or a plurality of the other heating sources facing the upstream side are provided, each having a different inclination angle with respect to the can body transport direction.

6. 4. The heating device according to claim 3, wherein the other heating source facing the upstream side is provided downstream of the one heating source facing the downstream side in the can body conveying direction.

7. 7. The heating device according to claim 6, wherein the other heat source facing the upstream side is provided adjacent to the one heat source facing the downstream side.

8. A plurality of heating sources, including the heating source arranged in an inclined state, are arranged on the side of the transport path in a state lined up in the can body transport direction, 2. The heating device according to claim 1, wherein a flow path for passing a gas supplied to the can bodies on the transport path is provided between adjacent ones of the plurality of heating sources.

9. 2. The heating device according to claim 1, wherein the heat sources are disposed at an angle with respect to the can body conveying direction, and are provided on both one side and the other side of the conveying path.

10. 2. The heating device according to claim 1, wherein a heat reflecting section is provided on one side and the other side of the transport path opposite to the side on which the heating source arranged at an angle is provided, for reflecting heat from the heating source toward the transport path.

11. The can body is formed in a cylindrical shape and has an axis, the conveying means conveys the can body with the axis aligned in a direction intersecting the extension direction of the conveying path, The heat source has an upstream end portion that is an end portion located on the upstream side in the can body transport direction, and a downstream end portion that is an end portion located on the downstream side in the can body transport direction, The heating device described in claim 1, wherein when a virtual plane is imagined that is perpendicular to the axial direction of the can body transported by the transporting means and reaches a position opposite the heating source and that crosses the can body, the heating source is positioned so that the plane crosses the heating source, and the heating source is positioned so that one of the upstream end and the downstream end is located closer to the transport path than the other on the plane.

12. A can body manufacturing system comprising an image forming unit that forms an image on the outer surface of a can body, and a heating device that heats the image formed on the can body by the image forming unit, and which produces can bodies with an image formed thereon, wherein the heating device is configured to include a heating device described in any one of claims 1 to 11.

Images