JP6900012B2 - container - Google Patents

Description

The present invention relates to a container having a groove-shaped container base having a pair of first side walls facing each other and a pair of second side walls closing both ends of the container base.

Conventionally, as a container of this type, a vertical groove is formed in a pair of connecting protrusions protruding from both side edges of the second side wall, and a pair of side edges of the first side wall are inserted into the vertical groove and welded. Is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-93706 (Fig. 1, paragraph [0026])

However, the above-mentioned conventional container has a problem that the welding quality is not stable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a container in which the quality of the welded portion is stable.

The invention of claim 1 made in order to achieve the above object is to close a container base having a pair of first side walls facing each other and an end portion of the container base in a groove shape with both ends open. A pair of second side walls, a connecting projection wall having a groove portion protruding from both side edges of each of the second side walls and receiving the side edge portion of the pair of first side walls, and the groove portion of each of the connecting protrusion walls. A welded portion provided on the outer outer protruding wall and welded to the first side wall, and a position on the back side of the welded portion or a position in the vicinity thereof on the inner protruding wall inside the groove portion of each of the connecting protruding walls. The outer protrusion wall is provided with a welding support protrusion most protruding into the container in the connecting protrusion, and a welding support surface formed at the tip of the welding support protrusion and parallel to the welding portion. The whole protrudes more from the second side wall than the entire inner protrusion, and at least a part of the welded portion is located ahead of the tip of the entire inner protrusion, and the inner protrusion is beyond the tip. It is a container provided with a cover protrusion that projects from the inside and faces the welded portion from the inside across the first side wall.

The invention of claim 2 is the container according to claim 1, wherein the outer protrusion wall is provided with a mark portion indicating the position of the welded portion.

The invention according to claim 3 is the container according to claim 1 or 2 , wherein the welding support protrusion is formed on the cover protrusion.

The invention according to claim 4 is the container according to any one of claims 1 to 3 , which does not have a rib protruding from the outer protrusion within 10 [mm] around the welded portion.

In the container of claim 1, the welding table is addressed to the inner protrusion wall in a state where the outer protrusion wall and the inner protrusion wall face each other with the first side wall interposed therebetween. Then, the welding horn is pressed against the outer protrusion wall, and a welding portion welded to the first side wall is formed on the outer protrusion wall. Here, the container of the present invention is provided with a welding support protrusion at or near the back side of the welding portion on the inner protrusion wall. The welding support protrusions most protrude into the container on the connecting protrusions, and the welding support surface at the tip of the welding support protrusions is parallel to the welding parts. As a result, the first side wall and the connecting protrusion wall are stabilized in a state of being sandwiched between the welding horn and the welding table, and the welding quality is also stable. Further, since the entire outer protrusion wall protrudes larger than the entire inner protrusion wall, the amount of protrusion of the groove forming protrusion of the mold for forming the groove between them is suppressed, and the strength of the groove forming protrusion is increased. It gets higher. In this case, there arises a problem that the welded portion of the outer protrusion wall is located ahead of the inner protrusion wall and the welding sagging becomes visible on the back surface (inner surface) of the first side wall. Welding dripping can be hidden by the cover protrusion protruding from the tip to the front, and the above problem is solved.

Since the outer protrusion wall of the container according to claim 2 is provided with a mark portion indicating the position of the welding portion, it is possible to prevent the welding horn from being pressed to a position significantly deviated from the welding support protrusion, and welding. The quality is stable.

In the container of claim 3, since the welding support protrusion is also formed at the cover protrusion, the welding quality is stable.

If the ribs are arranged near the portion where the welding horn is pressed, stress is concentrated around the ribs and whitening of the resin due to plastic deformation occurs. On the other hand, unlike the invention of claim 4 , since there is no rib protruding from the outer protrusion within 10 [mm] around the welded portion, the above-mentioned stress concentration can be alleviated and whitening can be suppressed.

Perspective view of the container according to the embodiment of the present invention Disassembled perspective view of the container Perspective view of the closing member Partial enlarged perspective view of the container Perspective view of the closing member Planosection of the joint between the first side wall and the connecting ridge Side sectional view of the connecting portion between the second side wall and the container base Side sectional view of the joint portion between the first side wall and the connecting protrusion wall

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 8. As shown in FIG. 1, the container 10 of the present embodiment is formed by closing both ends of a groove-shaped container base 11 with a pair of closing members 30 and 30. The container base 11 is formed by bending a resin sheet 12 made of corrugated cardboard plastic (resin foam sheet, resin corrugated cardboard, resin honeycomb board, etc.), and as shown in FIG. 2, has a rectangular groove bottom wall 13. It has a pair of first side walls 14 and 14 that stand up from the long side of the groove bottom wall 13, and a pair of connecting pieces 15 and 15 that stand up from the short side of the groove bottom wall 13 and are lower than the first side wall 14. .. Further, both ends of the groove bottom wall 13 in the longitudinal direction project outward from the side edge portions of the first side wall 14, and the connecting pieces 15 and 15 stand up from the tips of the projecting portions. Further, a plurality of slits 14S and 15S are formed on both side edges of the first side wall 14 and the upper edge of each connecting piece 15, respectively.

Further, handle holes 16 and 16 are formed one by one in the pair of first side walls 14 and 14. The handle holes 16 and 16 are arranged at positions offset from each other in the longitudinal direction of the container 10. Reinforcing parts 16A and 16A are attached to the opening edges of the handle holes 16 and 16.

Reinforcing rails 20, 20 are attached to the upper edges of the first side walls 14, 14. The reinforcing rail 20 is made of metal (specifically, aluminum), for example, and has a groove shape having a U-shaped cross section, and the total length thereof is the same as the total length of the first side wall 14. Further, through holes 23 penetrating the pair of facing walls 21 and 21 of the reinforcing rail 20 are formed at both ends and the center of the reinforcing rail 20 in the longitudinal direction.

As shown in FIG. 3, the closing member 30 has a “U” shape in a plan view in which the connecting protrusions 40, 40 protrude from both side edges of the second side wall 33 that closes the end opening of the container base 11. ing. Further, the lower edge portion of the second side wall 33 has a double wall structure. Specifically, the second side wall 33 includes a main plate wall 31 that constitutes the entire body excluding the lower edge portion thereof, and a sub-plate wall 32 that forms a horizontally long strip and forms the lower edge portion of the second side wall 33. , The sub-plate wall 32 is arranged at a position slightly shifted forward from the main plate wall 31.

Further, both side portions of the second side wall 33 are provided with a pair of first vertical ribs 38A and 38A extending in the entire vertical direction of the second side wall 33, and the vertical ribs 38A and 38A are provided with a main plate wall 31 and a sub. Both sides of the board wall 32 are connected. Further, the groove 33M, which is a gap between the main plate wall 31 and the sub plate wall 32, is provided with a plurality of in-groove ribs 33L (see FIG. 7) that communicate between the main plate wall 31 and the sub plate wall 32. .. Then, as shown in FIG. 7, the connecting piece 15 of the container base 11 is inserted into the groove 33M, and the plurality of in-groove ribs 33L are received by the plurality of slits 15S (see FIG. 2) of the connecting piece 15.

As shown in FIG. 6, a pair of side walls 49 (in FIG. 6, only one side wall 49 is shown) on the opposite side of the vertical rib 38A from both sides of the inner surface of the second side wall 33. ) Is overhanging. Further, vertical ribs 38B and 38C extending in the entire vertical direction of the second side wall 33 project from the outer surface of the side wall 49. The connecting protrusion 40 is projected from the vertical rib 38C on the side away from the second side wall 33. That is, the container 10 of the present embodiment has a structure in which the connecting protrusion 40 according to the present invention protrudes from both side edges of the second side wall 33 via the side wall 49 and the vertical rib 38C.

As shown in FIG. 5, the connecting protrusion 40 has a double wall structure as a whole. That is, the connecting protrusion 40 forms a substantially band shape and extends in the vertical direction, and forms a substantially band shape narrower than the outer protrusion wall 41 and the outer protrusion wall 41 forming the outer surface side of the connecting protrusion wall 40 in the vertical direction. It is composed of an inner protrusion 42 that extends and constitutes the inner surface side of the connecting protrusion 40, and an upper surface wall 43 that connects the outer protrusion 41 and the upper ends of the inner protrusion 42. Further, the groove portion 40M, which is a gap between the outer protrusion wall 41 and the inner protrusion wall 42, is provided with a plurality of in-groove ribs 40L connecting the outer protrusion wall 41 and the inner protrusion wall 42. .. Then, as shown in FIG. 8, the first side wall 14 of the container base 11 is inserted into the groove portion 40M, and the plurality of in-groove ribs 40L are received by the plurality of slits 14S of the first side wall 14.

As shown in FIG. 5, a rail receiving portion 40A formed by bulging the upper portions of the outer protrusion wall 41 and the inner protrusion wall 42 toward the square groove side is provided on the upper portion of the connecting protrusion wall 40. The end of the reinforcing rail 20 is received. Further, the lower surface portion of the rail receiving portion 40A is inclined so as to descend toward the tip end side of the connecting protrusion wall 40, whereby the connecting protrusion wall 40 is rotated around the lower end portion to reinforce the rail 20. Can be smoothly inserted into the rail receiving portion 40A.

Further, as shown in FIG. 5, the rail receiving portion 40A is formed with a through hole 40B that penetrates the outer protrusion 41 and the inner protrusion 42 in a straight line, and the through hole 40B and the end portion of the reinforcing rail 20 are formed. The through holes 23 of the above are overlapped with each other. Then, a rivet is passed through the through holes 23 and 40B from the outside of the container 10 and crimped, and the reinforcing rail 20, the first side wall 14, and the connecting protrusion 40 are fixed in a skewered state. Further, a rivet is also passed through the through hole 23 in the center in the longitudinal direction of the reinforcing rail 20, and the reinforcing rail 20 and the first side wall 14 are fixed. As shown in FIG. 4, the outer surface of the rail receiving portion 40A located outside the container 10 is surrounded by the vertical rib 38C, the horizontal rib 39 described below, and the like, and the head portion of the rivet (not shown) is formed. It is designed so that it does not protrude outward from the vertical rib 38C or the like. Further, on the inner side surface of the rail receiving portion 40A located inside the container 10, the upper edge portion and the lower edge portion are flush with the inner side surface 49N of the side wall 49, and the upper edge portion and the lower edge portion thereof are flush with each other. The portion sandwiched between the portions is depressed, and the tip portion of the crimped rivet is accommodated in the depressed portion so as not to protrude from the inner side surface 49N of the side wall 49 to the inside of the container 10.

As shown in FIG. 3, vertical ribs 38E extending in the vertical direction project from the tip edge on the outer surface of the outer protruding wall 41, and horizontal ribs 39 extending horizontally from a plurality of positions in the vertical direction on the outer surface of the outer protruding wall 41. Is overhanging. Further, the lateral rib 39 also projects from the lower edge portion of the rail receiving portion 40A which is inclined with respect to the horizontal direction. As shown in FIG. 8, regarding the relationship between the plurality of grooved ribs 40L and the lateral ribs 39 described above, the uppermost grooved ribs 40L are in the vicinity of the lateral ribs 39 at the lower edge of the rail receiving portion 40A. The other plurality of in-groove ribs 40L are arranged in the same plane as the lateral ribs 39.

As shown in FIG. 3, the lateral ribs 39 and 39 project from the upper edge portion and the lower edge portion of the sub-plate wall 32 described above, and the lateral ribs 39 and the two lateral ribs 39 on the lower side of the outer protrusion wall 41 Is continuous. Further, vertical ribs 38D and 38D project from the positions near both ends in the horizontal direction on the outer surface of the sub-plate wall 32, and communicate between the upper and lower horizontal ribs 39 and 39 of the sub-plate wall 32.

In the main plate wall 31 described above, the upper edge portion thereof is bent in a square groove shape to form a square groove portion 36, and a handle hole 37 is formed below the square groove portion 36. Further, at the corner portion where each connecting protrusion wall 40 and the second side wall 33 intersect, an L-shaped upper surface protrusion 34 protrudes from the outer edge side of the upper surface thereof, while the lower surface protrusion 35 protrudes from the inner edge side of the lower surface. ing. Then, when the containers 10 are stacked, the lower surface protrusion 35 of the upper container 10 engages with the inside of the upper surface protrusion 34 of the lower container 10.

The closing member 30 and the container base 11 are fixed by vibration welding. Therefore, as shown in FIG. 3, a plurality of welding recesses 51 are formed in a vertical row on the outer surface of the outer protrusion wall 41 as a "marking portion" to which the welding horn 59 (see FIG. 8) is addressed. Has been done. The welding recess 51 is formed by retracting the wall thickness of the outer protrusion 41 in a circular shape from the outer surface side, and the portion of the outer protrusion 41 on which the welding recess 51 is formed is partially thin. Then, the inner portion of the welding recess 51 becomes the welding portion 51Y which is vibrated and welded to the first side wall 14. The inner edge of the welding recess 51 is tapered. Further, the welding recess 51 is arranged at a position separated by a predetermined distance (for example, 10 [mm]) or more from the horizontal ribs 39, the vertical ribs 38C, 38E and the grooved rib 40L protruding from the outer protrusion wall 41.

On the outer surface of the sub-plate wall 32, a plurality of welding recesses 52 having the same shape as the above-mentioned welding recess 51 are formed side by side in a horizontal row, and the inner portion of the welding recess 52 is vibration-welded to the connecting piece 15. It becomes 52Y. Further, the welding recess 52 is also arranged at a position separated by a predetermined distance (for example, 10 [mm]) or more from the horizontal ribs 39, the vertical ribs 38A, 38D and the grooved rib 33L protruding from the sub-plate wall 32.

A plurality of welding support protrusions 62 for addressing the welding table 60 are formed on the inner protrusion 42 of the outer protrusion 41. Specifically, as shown in FIG. 6, the inner side surface 42N of the entire inner protrusion wall 42 is displaced outward from the inner side surface 49N of the side wall 49. Further, as shown in FIG. 6, the stepped portion of the inner protruding wall 42 between the side wall 49 and the side wall 49 is provided with an inclined surface 42B inclined at an angle of approximately 45 degrees with respect to the inner side surface 49N of the side wall 49. The tip of the inner protrusion 42 is provided with an inclined surface 42A inclined at an angle gentler than 45 degrees. Further, as shown in FIG. 7, the inner surface of the portion of the inner protrusion wall 42 that serves as the rail receiving portion 40A and protrudes inward is flush with the inner surface 49N of the side wall 49.

Further, as shown in FIG. 6, the entire outer protrusion wall 41 protrudes more from the second side wall 33 than the entire inner protrusion wall 42, and as shown in FIG. 7, a plurality of plastic welding recesses 51 of the outer protrusion wall 41 A part of the inner protrusion wall 42 is located ahead of the tip of the entire inner protrusion wall 42. On the other hand, a plurality of cover protrusions 61 project from the tip of the inner protrusion 42 to the front side. Each cover protrusion 61 has an arc shape corresponding to a part of the welding recess 51. Then, these cover protrusions 61 cover the portion of the welding recess 51 located ahead of the entire inner protrusion 42.

Two welding support protrusions 62 of the inner protrusion wall 42 are provided at positions on the back side of each welding recess 51 on the inner side surface 42N of the inner protrusion wall 42. Each welding support protrusion 62 has a trapezoidal cross section and extends horizontally from a stepped portion between the inner protrusion wall 42 and the side wall 49 to the tip of the cover protrusion 61. The portion of the welding support protrusion 62 corresponding to the upper side of the trapezoidal cross section is the welding support surface 62A flush with the inner surface 49N of the side wall 49 and the inner surface of the rail receiving portion 40A. That is, the welding support protrusion 62 is the most protruding portion inside the container 10 together with the rail receiving portion 40A in the connecting protrusion 40. As a result, the welding table 60 having a simple shape can be inserted from the upper part of the container 10 and brought into contact with the back side of the welding portion 51Y.

The inclination angles of the slopes 62B and 62B and the lowermost slope 62B adjacent to each other between the paired welding support protrusions 62 and 62 corresponding to the common welding recess 51 in the vertical direction are other than those. It is larger than the inclination angle of the slope 62B in the vertical direction. Further, as shown in FIG. 6, an inclined surface 61S having an inclination angle different from that of the inclined surface 42A of the entire inner protrusion wall 42 described above is formed at the end of the welding support protrusion 62 on the cover protrusion 61 side. ..

As shown in FIG. 5, a pair of arc-shaped cover protrusions 71 similar to the cover protrusion 61 of the inner protrusion 42 is provided at a position closer to the center in the lateral direction at the lower end of the main plate wall 31, and is provided as a sub. The plate wall 32 faces the lower part of a pair of welding recesses 52 located closer to the center in the lateral direction from the back side. Further, a pair of triangular cover protrusions 73 are provided from both ends in the lateral direction at the lower end of the main plate wall 31, and face the lower portion of the welding recesses 52 at both ends in the lateral direction on the sub-wall 32 from the back side. ing.

An inner surface recess 72 is formed between the adjacent cover protrusions 71 and 73 of the lower edge of the main plate wall 31. Each inner surface recess 72 has a shape having slopes 72B on both sides and above the bottom surface 72A parallel to the inner surface of the entire main plate wall 31. Further, in the second side wall 33, the inner side surface of the main plate wall 31 is located on the innermost side of the container 10 in the second side wall 33.

This concludes the description of the configuration of the container 10 of the present embodiment. Next, the action and effect of the container 10 will be described. The container 10 of the present embodiment is manufactured as follows. The container base 11 is manufactured by punching or cutting corrugated cardboard plastic and bending it. The reinforcing rail 20 is manufactured by forming through holes 23 at both ends and a central portion of the rail 20 which has been cut to a predetermined length in advance. The closing member 30 is manufactured by an injection molding die. Here, among the injection molding dies, there is a concern that the groove molding protrusion for molding the groove 40M of the connecting protrusion wall 40 may be deformed by the resin pressure at the time of molding. On the other hand, in the closing member 30 of the present embodiment, the entire outer protrusion 41 protrudes more from the inner surface of the second side wall 33 than the entire inner protrusion 42, so that the amount of protrusion of the groove forming protrusion is suppressed. , Deformation of the groove forming protrusion due to resin pressure can also be suppressed.

The container base 11, the connecting protrusion 40, and the reinforcing rail 20 are assembled as follows. Reinforcing rails 20 and 20 are fitted to the tips of the first side walls 14 of the container base 11, and the connecting pieces 15 and 15 of the container base 11 are inserted into the grooves 33M and 33M of the closing members 30 and 30. Then, the closing members 30 and 30 are rotated together with the connecting pieces 15 and 15, and the side edges of the pair of first side walls 14 and 14 are the groove portions 40M of the pair of connecting protrusions 40 and 40 of each closing member 30. , 40M, and the ends of the reinforcing rails 20, 20 are fitted into the rail receiving portions 40A, 40A at the upper ends of the groove portions 40M, 40M. In this state, rivets are driven into the through holes 23 and 40B of the reinforcing rail 20 and the rail receiving portion 40A.

Next, as shown in FIG. 8, the welding table 60 is addressed to the inner protrusion 42 of the connecting protrusion 40, the welding horn 59 is pressed against the outer protrusion 41 of each connecting protrusion 40, and the outer welding horn 59 is pressed against the outer protrusion. Welded portions 51Y welded to the first side wall 14 are formed at a plurality of positions of 41. In the same manner as this, although not shown, the welding table 60 is addressed to the main plate wall 31 of the closing member 30, the welding horn 59 is pressed against the welding recess 52 of the sub plate wall 32, and the welding horn 59 is pressed at a plurality of positions of the main plate wall 31. A welded portion 52Y welded to the connecting piece 15 is formed.

Here, the inner protrusion wall 42 is provided with a plurality of welding support protrusions 62 at positions on the back side of the plurality of welding portions 51Y. The welding support protrusions 62 project most into the container 10 on the connecting protrusion wall 40, and the welding support surfaces 62A at the tips of the plurality of welding support protrusions 62 are flush with each other and parallel to the welding portion 51Y. It has become. As a result, the first side wall 14 and the connecting protrusion 40 are stabilized in a state of being sandwiched between the welding horn 59 and the welding table 60, and the welding quality is also stable. Further, if the entire inner surface of the inner protrusion wall 42 is made flush with each other, the wall thickness becomes too large, which may cause problems such as "weight increase" of the container, "deformation" and "sink" during molding. According to the configuration of the form, those "sinks" and the like can be suppressed. Further, since the outer protrusion wall 41 is provided with a welding recess 51 as a “marking portion” indicating the positions of the plurality of welding portions 51Y, the welding horn 59 is located at a position largely deviated from the welding support protrusion 62. It is prevented from being pressed against.

Further, in the container 10 of the present embodiment, as described above, the outer protrusion wall 41 protrudes from the inner protrusion wall 42 from the second side wall 33 in order to secure the strength of the groove forming protrusion of the mold. The welded portion 51Y of the outer protrusion wall 41 is located ahead of the tip of the entire inner protrusion wall 42. For this reason, there is a concern that welding dripping may appear on the inner surface of the first side wall 14 and the appearance may be deteriorated. On the other hand, since the cover protrusion 61 projects forward from the tip of the inner protrusion 42 and covers the back side portion of the welded portion 51Y on the first side wall 14 with the cover protrusion 61, the above problem is solved. Further, since the welding support protrusion 62 is also formed on the cover protrusion 61, the welding quality is stable.

If the ribs are arranged in the vicinity of the portion where the welding horn 59 is pressed, stress is concentrated around the ribs and whitening of the resin due to plastic deformation occurs. On the other hand, the container 10 of the present embodiment does not have a rib protruding from the outer protrusion 41 within 10 [mm] around the welded portion 51Y as described above, so that the stress concentration described above is relaxed and whitening is achieved. It can be suppressed. Further, the same effect as the series of effects of providing the cover protrusion 61 on the inner protrusion 42 described above is also exhibited by providing the cover protrusion 71 on the main plate wall 31.

[Other Embodiments]
The present invention is not limited to the above embodiments, and for example, embodiments as described below are also included in the technical scope of the present invention, and various other than the following, as long as they do not deviate from the gist. It can be changed and implemented.

(1) In the above embodiment, the welding support surface 62A of the welding support protrusion 62 provided on the connecting protrusion wall 40 is flush with the inner side surface 49N of the side wall 49, but the welding support of the welding support protrusion 62 If the surface 62A is located most inside the container 10 on the connecting protrusion wall 40, the welding support surface 62A of the welding support protrusion 62 and the inner surface 49N of the side wall 49 do not have to be flush with each other, and the welding support The inner side surface 49N of the side wall 49 may project more inside the container 10 than the welding support surface 62A of the protrusion 62.

(2) In the above embodiment, the outer protrusion wall 41 is provided with a plurality of welded portions 51Y, respectively, but the outer protrusion wall 41 may be provided with only one welded portion 51Y.

(3) The welding portions 51Y and 52Y of the container 10 of the above embodiment were formed in the welding recesses 51 and 52 formed by being depressed in the outer protrusion wall 41 and the sub-plate wall 32, but were formed in the welding recesses 51 and 52. A portion that is not formed may be welded to form a welded portion according to the present invention.

(4) Instead of the welding recesses 51 and 52 as the "marking portion" according to the present invention of the above embodiment, a marking arranged in the vicinity of the welding portions 51Y and 52Y and an annular protrusion surrounding the welding portions 51Y and 52Y. Articles may be provided as "markers".

(5)
In the above-described embodiment, a pair of connecting protrusions 40, 40 are integrally formed on the second side wall 33, but the present invention comprises a second side wall 33 and connecting protrusions 40, 40 as separate parts. May be applied. Specifically, for example, the pair of connecting pieces 15 and 15 of the container base 11 in the above embodiment are set to have the same height as the pair of first side walls 14 and 14 to form a pair of second side walls and at the four corners. Corner parts having an L-shaped flat cross section are provided, and both sides of the L-shaped flat cross section of each corner part form a connecting protrusion having substantially the same shape as the connecting protrusion 40 of the embodiment, and are adjacent to the groove portion of the connecting protrusion. The present invention may be applied to a material that is welded in a state where both side edges of the first side wall and the second side wall that match each other are fitted. Each corner part is divided into a plurality of parts in the vertical direction, and the number of stacked corner parts is changed according to the height of the first side wall and the second side wall to corner between containers of different sizes. You may try to standardize the parts of the parts.

10 Container 11 Container base 14 First side wall 40 Connecting protrusion 40M Groove 41 Outer protrusion 42 Inner protrusion 51, 52 Welding recess (marking part)
51Y, 52Y Welding part 59 Welding horn 60 Welding table 62,72 Welding support protrusion 62A, 72A Welding support surface

Claims (4)

A container substrate having a groove shape with both ends open and having a pair of first side walls facing each other.
A pair of second side walls that close the ends of the container substrate, and
A connecting ridge having a groove that protrudes from both side edges of each of the second side walls and receives the side edges of the pair of first side walls.
Of each of the connecting protrusions, a welding portion provided on the outer protrusion outside the groove and welded to the first side wall, and a welding portion.
Of each of the connecting protrusions, a welding support protrusion that is arranged at or near the back side of the welding portion on the inner protrusion inside the groove and projects most into the container on the connecting protrusion.
A welding support surface formed at the tip of the welding support protrusion and parallel to the welding portion is provided .
The entire outer protrusion wall protrudes more from the second side wall than the entire inner protrusion wall.
At least a part of the welded portion is located ahead of the tip of the entire inner protrusion wall.
A container provided with a cover protrusion that projects from the tip of the inner protrusion to the front and faces the welded portion from the inside with the first side wall interposed therebetween. The container according to claim 1, wherein the outer protrusion wall is provided with a mark portion indicating the position of the welded portion. The container according to claim 1 or 2 , wherein the welding support protrusion is formed on the cover protrusion. The container according to any one of claims 1 to 3, which does not have a rib protruding from the outer protrusion within 10 [mm] around the welded portion.

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