JP2006321500A - Can, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can which has a structure capable of ensuring a sufficient airtightness by a sealing material even if a seam portion has many wrinkles formed at a part on the outside from a can body on the periphery of a lid, and to provide a manufacturing method thereof. <P>SOLUTION: The can 100 has the seam portion 40 which is formed by seaming the periphery 22 of the lid 20 interposing a sealing member 30 at an open end portion where the flange 12 of the can body 10 is formed. The seam portion 40 is formed in such a way that an area E1 filled with the sealing material 30 is larger than an area E2 not filled with the sealing material 30 in a space S formed between the inner surface of the can body 10 and a part E of the lid 20 press and seamed to the inner surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a can body having a structure in which a peripheral edge portion of a lid body is wound around an open end portion where a flange of a can body is formed, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, there is a can body having a structure in which a peripheral edge portion of a lid body is wound around an open end portion where a flange of a can body is formed. In this type of can body, in order to maintain the airtightness between the lid body and the can body, a sealing material (compound) is applied to the inner surface of the peripheral portion of the lid body that is wound around the open end of the can body. (For example, refer to Patent Documents 1, 2, and 3).

  Generally, the winding of the peripheral edge of the lid to the open end of the can body is performed as shown in FIGS. FIG. 14 is an enlarged cross-sectional view showing the peripheral edge of the lid before winding and the open end where the flange of the can body is formed, and FIG. 15 shows the peripheral edge of the lid in the can body. It is sectional drawing which expands and shows the structure of the tightening part formed by winding at the open end part of this.

  As shown in FIG. 14, a flange 52 protruding outward is formed at the open end of the can body 50. The lid body 60 includes a lid body 61 that closes the opening of the can body 50 and a peripheral edge portion 62 that follows the outer edge of the lid body 61. The peripheral portion 62 of the lid 60 is composed of a base 621 following the lid main body 61, a channel portion 622 following the base 621, and a lip portion 623 following the channel portion 622, and the base 621, the channel portion 622, and the lip portion 623 cover the lid 60. A groove that opens inwardly of the body 60 (downward in FIG. 14) is formed.

  First, a sealing material (compound) 70 is applied to the inner surface of the peripheral edge 62 of the lid body 60 having the structure as described above. The sealing material 70 is applied substantially uniformly from the vicinity of the tip of the peripheral edge portion 62 (lip portion 623) to the boundary portion between the base portion 621 and the channel portion 622. Next, the lid 60 is set at the open end of the can body 50 so that the lid body 61 closes the opening of the can body 50. As a result, the boundary portion between the base portion 621 of the peripheral portion 62 of the lid body 60 and the channel portion 622 is in a state of facing the root portion of the flange 52 of the can body 50. In this state, the peripheral edge 62 of the lid 60 is wound around the open end of the can body 50, as shown in FIG. A winding part 80 is formed.

Thus, in the can body 500 having a structure in which the peripheral edge 62 of the lid 60 is fastened and fixed to the open end of the can body 50, similarly to the peripheral edge 62 of the lid 60 curled by the fastening. The gap between the curled can body 50 and the open end (the portion corresponding to the flange 52) is filled with the sealing material 70. Thereby, the airtightness in the junction part of the can body 50 and the cover body 60 in the can body 500 is maintained.
JP 59-156470 A JP 63-151803 A JP 2001-278326 A

  By the way, in the conventional can body 500, from the viewpoint of avoiding the sealing material 70 from protruding from the tightening portion 80 along the inner surface of the can body 50, in general, the sealing material 70 is, as shown in FIG. One side is applied up to the vicinity of the tip of the peripheral edge 62 of the lid 60, while the other side is applied only up to the boundary portion between the base 621 and the channel part 622 of the peripheral edge 62. As a result, the sealing material 70 sufficiently reaches the tip 62t of the peripheral edge 62 of the curled lid 60 in the tightening portion 80, while the inner surface of the can body 60 of the tightening portion 80 and the lid that is tightened thereto. The region E1 filled with the sealing material 70 in the gap S between the portion 60 (the portion of the base 621 of the peripheral edge 62 and indicated by the symbol E in FIG. 15) is smaller than the region E2 where the sealing material 70 is not filled. .

  Thus, in the can body 500 in which the airtightness is mainly maintained by the sealing material 70 reaching the tip 62t of the peripheral edge portion 62 of the curled lid body 60 in the winding portion 80, the following problems are caused. is there.

  For example, in a rectangular can body having a small curvature radius at the corner portion, when the peripheral edge portion 62 of the lid body 60 is tightened around the open end portion of the can body 50, the peripheral edge portion of the lid body 60 curled at the corner portion The wrinkles are likely to be generated in the outer part (the part corresponding to the channel part 622 and the lip part 623: see FIG. 14) from the 62 can body 50. When a lot of wrinkles are generated in the outer periphery of the can body 50 of the peripheral edge 62 of the lid 60 in the winding portion 80 of the corner portion, it is difficult to uniformly fill the sealing material 70 in that portion. For this reason, there is a possibility that the sealing material 70 applied so as to reach the tip 62t of the peripheral edge 62 of the curled lid body 60 may protrude outside without functioning effectively, and the airtightness thereof may be reduced. .

  The present invention has been made in order to solve such a problem, and even if a lot of wrinkles are generated on the outer periphery of the can body at the periphery of the lid body in the tightening portion, the sealing material is airtight. It is possible to provide a can body having a structure capable of maintaining the above and a manufacturing method thereof.

  A can body according to the present invention is a can body having a tightening portion formed by sandwiching and tightening a sealing material at an open end portion where a flange of a can body is formed at a peripheral portion of a lid body, The region where the sealing material is filled in the gap between the inner surface of the can body of the tightening portion and the portion of the lid that is clamped thereto is larger than the region where the sealing member is not filled.

  Even if a lot of wrinkles are generated at the outer periphery of the can body at the peripheral edge of the lid, the periphery of the lid is formed by sandwiching and tightening the sealing material between the open end of the can body. There is almost no generation of wrinkles in the portion of the lid that is pressed against the inner surface of the can body. Therefore, with the configuration as described above, a sealing material is provided in a larger area of the gap between the inner surface of the can body of the tightening portion and the portion of the lid body that is hardly pressed against the inner surface. Will be satisfied.

  In addition, the can according to the present invention can be configured such that the sealing material is evenly filled in the gap.

  With such a configuration, the sealing material is evenly filled in the gap between the inner surface of the can body of the tightening portion and the portion of the lid that hardly generates wrinkles that are pressed against the inner surface. The airtightness at the joint portion (winding portion) between the can body and the lid can be maintained relatively high.

  Further, the can body according to the present invention may be configured such that the sealing material does not protrude from the gap between the outer surface of the can body of the tightening portion and the portion of the lid body that is clamped thereto. it can.

  As described above, the sealing material is filled in a larger area of the gap between the inner surface of the can body of the tightening portion and the lid portion where the wrinkles are hardly pressed against the inner surface. The gap between the outer side surface of the can body of the fastening portion and the outer peripheral portion of the lid body, which can generate a lot of wrinkles by fastening, is sealed to the extent that it does not waste from the outside. If there is a material, the airtightness at the winding portion can be maintained relatively high.

  The method for manufacturing a can body according to the present invention is a method for manufacturing a can body having a tightening portion formed by sandwiching and tightening a peripheral portion of a lid body on an open end portion where a flange of a can body is formed with a sealing material interposed therebetween. A first step of applying a sealing material to an inner surface of a peripheral portion of the lid, and a step of forming the tightened portion by winding the peripheral portion of the lid on the open end of the can body And the first step includes the sealing material in the gap between the inner surface of the can body of the tightening portion formed in the second step and the portion of the lid that is tightened thereto. The sealing material can be applied so that a region where the material is filled is larger than a region where the sealing member is not filled.

  With such a configuration, a sealing material is filled in a larger area of the gap between the inner surface of the can body of the tightening portion and the portion of the lid that is hardly pressed against the inner surface. Will be able to.

  Further, in the method for manufacturing a can body according to the present invention, the first step applies the sealing material so that the sealing material is filled evenly in the gaps of the tightening portion formed in the second step. It can be set as the structure to do.

  With such a configuration, it becomes possible to evenly fill the sealing material in the gap between the inner side surface of the can body of the tightening portion and the portion of the lid body that is hardly pressed against the inner side surface. Therefore, the airtightness at the joint portion (winding portion) between the can body and the lid can be maintained at a higher level.

  In addition, the method for manufacturing a can body according to the present invention further includes a step of heating the winding fastening portion and reflowing the sealing material in the winding fastening portion after the winding fastening portion is formed. It can be.

  With such a configuration, even if the amount of the sealing material applied to the portion outside the can body of the lid is relatively small, the winding portion is reflowed to a loose portion due to the occurrence of wrinkles. Since the sealed material is allowed to flow, the airtightness at the tightening portion can be maintained at a higher level.

  According to the can body and the manufacturing method thereof according to the present invention, the gap between the inner side surface of the can body of the tightening portion and the portion of the lid body that is hardly crimped by the inner side surface is generated. Since the sealing material is filled in a large area, even if a lot of wrinkles are generated in the outer periphery of the can body at the periphery of the lid body in the tightening portion, the sealing material can maintain airtightness. become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The appearance of a can according to an embodiment of the present invention is shown in FIG. The can body 100 is a rectangular can body, for example, an in-vehicle capacitor container. When a rectangular capacitor container is loaded on a plurality of vehicles, the radius of curvature of each corner portion C is set to be as small as possible in order to minimize the loading area. For example, in a rectangular capacitor container (can) having a side length of about 50 mm, the radius R of each corner C is set to 10 mm or less, more specifically, about 5 mm.

  In FIG. 1, this can body 100 (capacitor container) has a can body 10 on which a bead 15 is formed, a canopy 20a, and a bottom cover 20b. A tightening portion 40a is formed by sandwiching and tightening the peripheral edge of the canopy 20a with one open end of the can body 10 with a sealing material (not shown), and the peripheral edge of the bottom lid 20b is connected to the other end of the can body 10 A tightening portion 40b is formed by sandwiching a sealing material (not shown) at the open end of the wire and tightening it. An electrode support portion 25 is provided at a substantially central portion of the canopy 20a, and each electrode (not shown) protrudes from the electrode support portion 25.

  The can 100 (capacitor container) as described above is manufactured according to the procedure shown in FIGS. 2 to 10, (a) is a plan view of the manufactured product, and (b) is a longitudinal sectional view thereof.

  First, in the cupping step, a round first cup 10 (1) as shown in FIGS. 2A and 2B is formed by drawing the material metal plate. In the redrawing step, the first cup 10 (1) obtained in the cupping step is drawn again, and the diameter and depth are further increased as shown in FIGS. 3 (a) and 3 (b). The adjusted second cup 10 (2) is formed. In the trimming process, the cylindrical body 10 (3) as shown in FIGS. 4A and 4B is obtained by cutting off the upper end and the lower end of the second cup 10 (2) obtained in the redrawing process. Is formed. Then, in the reforming process, the cylindrical body 10 (3) obtained in the trimming process is reformed by a mold, and the first rectangular tube that becomes the original shape of the can body 10 as shown in FIGS. 5 (a) and 5 (b). A body 10 (4) is formed.

  Next, in the neck molding process, the upper and lower open ends of the first rectangular tube 10 (4) obtained in the reforming process are squeezed, so that both ends are shown in FIGS. 6 (a) and 6 (b). A second rectangular tube 10 (5) serving as a throttle neck is formed. In the bead molding process, each side surface of the second rectangular tube 10 (5) obtained in the neck molding process is subjected to uneven processing, and with a bead 15 as shown in FIGS. 7 (a) and 7 (b). The third rectangular cylinder 10 (6) is formed. Then, in the flange molding step, each open end portion (neck portion) of the third rectangular tube 10 (6) obtained in the bead molding step is extruded outward, so that FIG. As shown in b), flanges 12a and 12b are formed at each open end. As a result, the can body 10 having a square shape in which the beads 15 are formed on the respective side surfaces and the flanges 12a and 12b are formed on the respective open end portions is completed.

  Next, in the bottom lid winding process, the peripheral edge portion of the bottom lid 20b is sandwiched between the open end portion where the flange 12b of the can body 10 is formed and is tightened (by a tightening machine). As shown to a) and (b), the bottom cover 20b is joined to one open end part of the can body 10, and the fastening part 40b is formed in the junction part. Further, in the canopy tightening step, the peripheral portion of the canopy 20a is sandwiched between the open end portion where the flange 12a of the can body 10 is formed and tightened (by the tightening machine), thereby FIG. As shown to (b), the canopy 20a is joined to the other open end part of the can body 10, and the winding part 40a is formed in the junction part.

  By the procedure as described above, the can body 100 (capacitor container) having an external structure as shown in FIG. 1 is completed.

  Further, the detailed structure of the canopy 20a and the bottom cover 20b described above, the detailed structure of the open end of the can body 10, the bottom cover winding process (see FIGS. 9A and 9B) and the canopy winding process ( Details of FIGS. 10A and 10B will be described with reference to FIGS. Since the bottom lid winding process and the canopy winding process are performed in the same procedure, in FIGS. 11 and 12, the canopy 20a and the bottom cover 20b are representatively shown as the lid body 20, and the flange 12a, 12b is representatively shown as the flange 12, and further, a tightening portion 40a formed at a joint portion between the canopy 20a and the can body 10 and a tightening portion formed at a joint portion between the bottom lid 20b and the can body 10 Reference numeral 40 b is representatively shown as the tightening portion 40. FIG. 11 is an enlarged cross-sectional view showing the peripheral edge of the lid before winding and the open end where the flange of the can body is formed, and FIG. 12 shows the peripheral edge of the lid in the can body. It is sectional drawing which expands and shows the structure of the tightening part formed by winding at the open end part of this.

  As shown in FIG. 11, an outwardly projecting flange 12 is formed at the open end of the can body 10, and the lid 20 includes a lid body 21 and a lid body 21 that close the opening of the can body 10. It is comprised in the peripheral part 22 following the outer edge. The peripheral portion 22 of the lid body 20 includes a base portion 221 following the lid main body 21, a channel portion 222 following the base portion 221, and a lip portion 223 following the channel portion 222, and the base portion 221, the channel portion 222 and the lip portion 223 cover the lid portion 221. A groove that opens inwardly of the body 20 (downward in FIG. 11) is formed.

The lid 20 (bottom lid, canopy) is tightened in the following two steps.
First, in a 1st process, a sealing material (compound) is apply | coated to the inner surface of the peripheral part 22 of the cover body 20 used as the structure mentioned above. The sealing material 30 is applied substantially uniformly from the substantially central portion of the channel portion 222 in the peripheral edge portion 22 of the lid body 20 to the vicinity of the boundary portion between the base portion 221 and the lid main body 21. That is, as compared with the conventional case (see FIG. 14), the sealing material 30 is applied to a position closer to the inner side (right direction in FIG. 11) of the peripheral edge portion 22 of the lid 20. Then, the lid 20 is set on the open end of the can body 10 so that the lid body 21 closes the opening of the can body 10. As a result, the boundary portion between the base portion 221 of the peripheral portion 22 of the lid body 20 and the channel portion 222 is in a state of facing the root portion of the flange 12 of the can body 10.

  Next, in the second step, in the above state (see FIG. 11), the peripheral edge portion 22 of the lid body 20 is wound around the open end portion of the can body 10 as shown in FIG. A winding portion 40 is formed at a joint portion between the open end of the body 10 and the lid 20.

  Thus, in the can body 100 in which the peripheral edge portion 22 of the lid body 20 is wound around the open end of the can body 10 and the tightening portion 40 is formed at the joint portion between the can body 10 and the lid body 20, In the fastening portion 40, the sealing material 30 is sandwiched between the peripheral edge portion 22 of the lid body 20 curled by winding and the open end portion (a portion corresponding to the flange 12) of the similarly curled can body 10. It becomes a state. As shown in FIG. 11, the sealing material 30 is applied from the substantially central portion of the channel portion 222 in the peripheral portion 22 of the lid body 20 to the vicinity of the boundary portion between the base portion 221 and the lid body 21. The sealing material 30 does not protrude along the outer surface of the can body 10 at the fastening portion 40, and the inner surface of the can body 10 and the portion of the lid body 20 that is tightened thereto (the portion of the base portion 221 of the peripheral portion 22). 12 is filled with the sealing material 30 evenly.

  In particular, in the winding part 40 of each corner part C (see FIG. 1) having a small radius of curvature of the can body 100, a lot of wrinkles may occur in a portion outside the can body 10 of the peripheral part 22 of the lid body 20, Almost no wrinkles are generated in the portion of the lid 20 that is pressed against the inner surface of the can body 10. In the can body 100 having the above-described structure, even if a lot of wrinkles are generated on the outer side of the can body 10 of the peripheral edge portion 22 of the lid body 20, the inner surface of the can body 10 and the inner surface of the tightening portion 40 are fastened. Since the seal material 30 is evenly filled in the gap S between the portion of the lid 20 that hardly generates wrinkles (the portion of the base portion 221 of the peripheral edge portion 22 and the portion indicated by E in FIG. 12). The airtightness in the winding part 40 can be maintained relatively high.

  As the sealing material 30 described above, for example, an aqueous one-component type synthetic resin sealing compound can be used. In this case, as shown in FIG. 11, the sealing material 30 applied from approximately the center of the channel portion 222 in the peripheral portion 22 of the lid 20 to the vicinity of the boundary between the base 221 and the lid body 21 is about 10 at about 90 ° C. By preliminarily drying and volatilizing the moisture, a sealing material film is formed on the aforementioned portion of the peripheral portion 22 of the lid 20. And this sealing material membrane | film | coat has the intensity | strength which can endure the clamping pressure at the time of the peripheral part 22 of the cover body 20 being wound around the open end part of the can body 10 as shown in FIG.

  After the tightening portion 40 as shown in FIG. 12 is formed, the sealing material film (sealing material 30) is melted and fluidized by heating again at about 160 ° C. The re-fluidized sealing material 30 flows into a portion where the tightening pressure is loose due to the generation of wrinkles in the tightening portion 40 or the like.

  In the case of a rectangular can body 100 as shown in FIG. 1, unlike the cylindrical can body, the tightening pressure in the circumferential direction of the tightening portion 40 is not uniform, and the tightening pressure differs between the straight portion and the corner portion C. In addition, the occurrence of wrinkles at the corners is considered to promote non-uniform tightening pressure. By heating and reflowing the sealing material 30, the sealing material 30 flows into a portion where the tightening pressure is loose and the sealing performance is inferior, thereby further improving the airtightness over the entire circumference of the winding portion 40 in the rectangular can 100. It can be certain.

  Further, the sealing material 30 reacts with the prepolymer constituting it by heating, becomes high molecular weight, becomes a three-dimensional network, and has higher elasticity, and also the surface of the lid 20 and the can body 10. It also reacts with the surface and adheres to these surfaces. Also by this, the airtightness at the winding portion 40 can be more reliably maintained.

  Note that it is not always clear which position the sealing material 30 has reached in the winding portion 40 by reflowing the sealing material 30 as described above, but the sealing material 30 is placed at a position as shown in FIG. When applied, the sealing material 30 does not protrude from the winding portion 40 along the outer surface of the can body 10.

  In addition, the sealing material 70 is apply | coated to the front-end | tip vicinity of the peripheral part 62 of the cover body 60 conventionally (refer FIG. 14), and the fastening part is wound by winding the peripheral part 62 to the open end part of the can body 50. When the sealant 70 is reflowed after forming 80 (see FIG. 15), the sealant 70 flows toward the corner portion with wrinkles at once, and further toward the outside of the tightening portion 80 from the wrinkles. It begins to protrude. For this reason, in the winding part 80, it is hard to generate | occur | produce the fastening pressure effective for sealing with respect to the sealing material 70, and it is easy to lose. For this reason, it is difficult to obtain reliable airtightness at the winding portion 80.

  In the above-described embodiment of the present invention, the inner side surface of the can body 10 of the tightening portion 40 and the portion of the lid body 20 to be tightened thereto (the portion of the base portion 221 of the peripheral portion 22, denoted by E in FIG. 12). The sealing material 30 is uniformly filled in the gap S between the portion (shown), but the present invention is not limited to this. As shown in FIG. 13, the sealing material 30 in the gap S between the inner side surface of the can body 10 of the tightening portion 40 and the portion of the lid 20 (the portion indicated by the symbol E in FIG. 13) that is tightened thereto. It is sufficient that the region E1 filled with is larger than the region E2 where the sealing material 30 is not filled. Even in this case, a seal is provided in a region E1 having a larger gap S between the inner surface of the can body 10 of the tightening portion 40 and the portion of the lid body 20 that is tightly pressed by the inner surface where wrinkles are hardly generated. Since the material 30 can be filled, the airtightness in the winding portion 40 can be maintained.

  However, the larger the region E1 filled with the sealing material 30 in the gap S, the more preferable for maintaining the airtightness. As shown in FIG. 12, it is more preferable when the sealing material 30 is filled evenly (when the region E2 is zero).

  Furthermore, in the above-described embodiment of the present invention, the sealing material 30 is applied substantially uniformly from the substantially central portion of the channel portion 222 at the peripheral edge portion 22 of the lid body 20 to the vicinity of the boundary portion between the base portion 221 and the lid body 21. However, the sealing material 30 may be applied from the vicinity of the tip of the lip 223 at the peripheral edge 22 of the lid 20 to the vicinity of the boundary between the base 221 and the lid body 21. In this case, when the peripheral edge portion 22 of the lid body 20 is wound around the open end portion of the can body 10, there are many wrinkles on the outer periphery portion of the peripheral edge portion 22 of the lid body 20 in the tightening portion 40. However, unlike the conventional case (see FIG. 15), there is a possibility that the seal material 30 of that portion may protrude outside without effectively functioning. Since a large amount of the sealing material 30 is filled with the gap S between the portion of the lid 20 that hardly generates wrinkles (the portion of the base portion 221 of the peripheral edge portion 22 and the portion indicated by E in FIG. 12). The airtightness in the winding part 40 can be maintained.

  As described above, the can body and the manufacturing method thereof according to the present invention maintain the airtightness by the sealing material even if a lot of wrinkles are generated in the outer periphery of the can body at the peripheral edge of the lid body in the tightening portion. It is useful as a can body and a method of manufacturing the can body having an effect that the peripheral edge portion of the lid body is wound around the open end portion where the flange of the can body is formed.

It is a perspective view which shows the external appearance of the can which concerns on one Embodiment of this invention. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured goods obtained at a cupping process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured goods obtained by a redrawing process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured product obtained in a trimming process. It is the top view (a) and longitudinal cross-sectional view which show the manufactured goods (original form of a can body) obtained in a reform process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured product obtained in a neck shaping | molding process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured product obtained in a bead molding process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured goods (can body) obtained in a flange molding process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured article obtained in a bottom cover winding process. It is the top view (a) and longitudinal cross-sectional view (b) which show the manufactured goods (can body) obtained in a canopy winding process. It is sectional drawing which expands and shows the peripheral part of the cover body before winding, and the open end part in which the flange of the can body was formed. It is sectional drawing which expands and shows the structure of the winding part formed by winding the peripheral part of a cover body to the open end part of a can body. It is sectional drawing which expands and shows the other structural example of the winding part formed by winding the week edge part of a cover body to the open end part of a can body. It is sectional drawing which expands and shows the open end part in which the peripheral part of the cover body in the conventional can body and the flange of a can body were formed. It is sectional drawing which expands and shows the structure of the fastening part formed by winding the peripheral part of a cover body to the open end part of a can body in the conventional can body.

Explanation of symbols

10 Can body 12, 12a, 12b Flange 15 Bead 20 Lid 20a Canopy 20b Bottom lid 21 Lid body 22 Peripheral part 30 Sealing material (compound)
40 Winding part 100 Can body 221 Base part 222 Channel part 223 Lip part

Claims (6)

A can body having a tightening portion formed by sandwiching and tightening a sealing material at an open end portion where a flange of the can body is formed at a peripheral portion of the lid body,
The can is characterized in that a region filled with the sealing material in a gap between an inner surface of the can body of the tightening portion and a portion of the lid pressed against the can is larger than a region where the seal member is not filled. body.   The can according to claim 1, wherein the gap is evenly filled with the sealing material.   3. The can body according to claim 1, wherein the seal material does not protrude from a gap between an outer side surface of the can body of the tightening portion and a portion of the lid body that is tightened thereto. A method for manufacturing a can body having a tightening portion formed by sandwiching and tightening a sealing material at an open end portion where a flange of a can body is formed at a peripheral portion of a lid body,
A first step of applying a sealing material to the inner surface of the peripheral edge of the lid,
A second step of winding the periphery of the lid body around the open end of the can body to form the winding portion;
In the first step, the region filled with the sealing material in the gap between the inner surface of the can body of the tightening portion formed in the second step and the portion of the lid body to be tightened thereto is the seal. The method for producing a can, wherein the sealing material is applied so as to be larger than an unfilled region of the member.   6. The can according to claim 5, wherein in the first step, the sealing material is applied so that the gap between the tightening portions formed in the second step is uniformly filled with the sealing material. Manufacturing method. 6. The can according to claim 4, further comprising a step of reflowing the sealing material in the winding portion by heating the winding portion after the winding portion is formed. Manufacturing method.

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