Bung plug, bung plug assembly, tight head container, tight head container closure, and intermediate bulk container

Abstract

The invention relates to a bung plug (33) for arrangement in a bung socket (31), comprising a plug (38) which has an external thread (39) intended for co-operation with an internal thread (37) of the bung socket, and an annular sealing element (41) arranged on the outside circumference of the plug in front of the external thread as viewed in a screwing-in direction (35) of the bung plug into the bung socket, the plug being designed in such a way that a diameter (42) of the plug in a radial contact region (43) of the sealing element on the plug is greater than a core diameter (44) of the external thread and / or that the plug has a circumferential retaining ridge (45) for the sealing element in front of the external thread on the outer circumference as viewed in the screwing-in direction, the sealing element being arranged on the plug in front of the retaining ridge as viewed in the screwing-in direction.

Description

[0001] Bung plugs, bung plug arrangement, bung containers, bung container closures and intermediate bulk containers

[0002] The invention relates to a bung plug for arrangement in a bung socket, comprising a plug having an external thread intended to cooperate with an internal thread of the bung socket, and an annular sealing element arranged on the outer circumference of the plug in front of the external thread, as viewed in a screw-in direction of the bung plug into the bung socket. Furthermore, the invention relates to a bung plug assembly comprising a bung socket and a bung plug. Furthermore, the invention relates to bung containers. Furthermore, the invention relates to a bung container closure. Finally, the invention relates to an intermediate bulk container.

[0003] A bunghole container, in particular an intermediate bulk container (IBC), usually has a bunghole opening which is closed with a screw cap or closure. There are different designs of screw caps or closures. In particular, there is a so-called "closed screw cap" and an "open screw cap". A "closed screw cap" or a bunghole plug is intended to be arranged directly in a bunghole socket formed by the bunghole container to close a bunghole opening of a bunghole container. An "open screw cap" or a bunghole container closure comprises a closure lid for arrangement on a bunghole opening of a bunghole container, wherein the closure lid forms a bunghole socket, wherein the bunghole container closure comprises a bunghole plug for arrangement in the bunghole socket.Accordingly, the closure lid itself has at least one bung opening, which can be closed with the bung plug.

[0004] Typically, the bung plug comprises a plug having an external thread designed to interact with an internal thread of the bung socket, and an annular sealing element arranged on the plug's outer circumference in front of the external thread, as viewed in the direction of screwing the bung plug into the bung socket. The plug is designed such that a diameter of the plug in an axial contact area of ​​the sealing element on the plug is exactly as large as a core diameter of the external thread. This, in conjunction with manufacturing-related influencing parameters described below, regularly results in a reduced sealing effect. The external thread of a bung plug of a closure cap is often designed as a G2 thread.

[0005] Such screw caps or closures are usually manufactured in large quantities from a plastic material, for example PP and / or HDPE suitable for packaging hazardous goods, using an injection molding process. The individual components of the screw caps or closures - for example, in the case of an "open screw cap" or a bunghole container closure, the closure lid, the bunghole plug, and the sealing element - are produced using several injection molds. Due to the material and process, shrinkage and contraction regularly occur, which adversely affects the dimensional accuracy of the components. To make matters worse, the dimensions of the components can also fluctuate depending on the batch or as a result of tool-related dimensions or process influences.

[0006] Regardless of these circumstances, the components must always fit together for their intended interaction, particularly to create the necessary sealing effect. However, the aforementioned influencing parameters lead to this goal regularly not being achieved, resulting in a high level of rejects for pre-assembled screw caps or closures and, moreover, can lead to leaks in bung nozzles or bung containers for which the screw caps or closures may be intended, particularly if defects are overlooked during production-related inspections.

[0007] There is a further problem with the bung plug known from the prior art, which results from elastic deformation of the sealing element when the bung plug is arranged in the bung socket. When the bung plug is screwed into the bung socket, the sealing element typically first comes into contact with a conical section of the bung socket and a conical section of an annular gap formed between the bung plug and the bung socket. If the bung plug is screwed further or too deeply into the bung socket, the sealing element usually also presses into a cylindrical section of the annular gap in a section of the bung socket that adjoins the conical section when viewed in the screwing-in direction. A local impression is created on the sealing element as soon as the sealing element comes into contact with the start of the internal thread provided in the cylindrical section.This disadvantageously leads to a reduction in the sealing effect. The present invention is therefore based on the object of proposing a bung plug, a bung plug assembly, bung containers, a bung container closure, and an intermediate bulk container that enables a more reliable sealing of a bung nozzle.

[0008] This object is achieved by a bung plug having the features of claim 1, a bung plug arrangement having the features of claim 7, a bung container having the features of claim 14, a bung container closure having the features of claim 15, a bung container having the features of claim 16 and an intermediate bulk container having the features of claim 17.

[0009] In the following, the spatially understood terms “before” and “following”, such as “before the external thread”, “before the retaining web”, “following the collar” or “following the conical section” etc., refer to a screwing direction of the bung plug into the bung socket, which runs axially to the bung plug or bung socket.

[0010] The bung plug according to the invention for arrangement in a bung socket comprises a plug which has an external thread intended for cooperation with an internal thread of the bung socket, and an annular sealing element arranged on the outer circumference of the plug in front of the external thread, viewed in a screwing direction of the bung plug into the bung socket, wherein the plug is designed such that a diameter of the plug in a radial contact area of ​​the sealing element on the plug is greater than a core diameter of the external thread and / or wherein the plug has a circumferential holding web for the sealing element in front of the external thread on the outer circumference, viewed in the screwing direction, wherein the sealing element is arranged on the plug in front of the holding web.According to a first aspect of the invention, the plug is designed such that a diameter of the plug in a radial contact area of ​​the plug, in which the sealing element bears against the plug, is larger than a core diameter of the external thread. In other words, the invention aims to change a geometry of the bung plug or plug by locally increasing a diameter of the bung plug or plug in the radial contact area of ​​the sealing element on the plug, i.e., at a sealing seat, such that a width of an annular gap formed between the bung plug and the bung socket when the bung plug is screwed into a bung socket is reduced, whereby the sealing element bears against the bung socket with an increased preload force, so that a reliable seal of the bung socket can be achieved regardless of the aforementioned influencing parameters.This can also significantly reduce waste.

[0011] According to a second aspect of the invention, which is provided alternatively or in addition to the first aspect, the plug has a circumferential retaining web for the sealing element on the outer circumference in front of the external thread, wherein the sealing element is arranged in front of the retaining web in the radial contact area on the plug.The retaining web which delimits the radial contact area and holds the sealing element, against which the sealing element can axially rest, fixing the sealing element in the axial direction, not only prevents the sealing element from sliding down from the radial contact area of ​​increased diameter when the bung plug is not screwed on, insofar as the second aspect should be provided in addition to the first aspect, but also serves, independently of the first aspect, to ensure that the sealing element is held in a defined area between the bung socket and the bung plug when the bung plug is screwed on, and in particular that it cannot be drawn into the cylindrical area of ​​the annular gap. Contact of the sealing element with the start of the internal thread can thus be ruled out. In other words, the plug can be designed in such a way that when the bung plug is screwed into the bung socket, the sealing element engages the internal thread orThe beginning of the internal thread cannot touch the bung plug, regardless of the screw-in depth of the bung plug into the bung socket. This prevents a reduction in the sealing effect due to local indentations of the beginning of the internal thread on the sealing element.

[0012] In an advantageous embodiment of the bung plug, both the first and the second aspect are provided in the bung plug, whereby a particularly reliable sealing of the bung socket can be achieved.

[0013] The bung spout can be the bung spout of a bunghole container, in particular an inner container for an intermediate bulk container. Alternatively, the bung spout can be the bung spout of a closure lid for placement on a bunghole container opening of a bunghole container, in particular an inner container for an intermediate bulk container.

[0014] In an advantageous embodiment of the bung plug, the diameter of the plug in the radial contact area of ​​the sealing element on the plug can be 1.0 mm to 2.0 mm, preferably 1.2 mm to 1.6 mm, particularly preferably 1.4 mm, larger than the core diameter of the external thread.

[0015] In an advantageous embodiment of the bung plug, the external thread can be designed as a G2 thread. The internal thread can then also be designed as a G2 thread. In each case, this means a G2 thread based on the DIN ISO 228 standard in the version valid on the priority date of the present patent application. In an advantageous embodiment of the bung plug, the plug can have a circumferential collar on the outer circumference in front of the external thread, viewed in the screw-in direction, wherein the sealing element can be arranged downstream of the collar on the plug, viewed in the screw-in direction. The sealing element can then bear against the plug in an axial contact area of ​​the collar, so that the sealing element can be pressed in the screw-in direction by means of the collar when the bung plug is screwed into the bung socket.The collar can be provided in front of the retaining web, so that the sealing element can be arranged on the plug between the collar and the retaining web. In other words, the sealing element can bear against the plug in the radial contact area of ​​the plug provided between the collar and the retaining web. In addition, the sealing element can bear against the plug in the axial contact area of ​​the collar and in an axial contact area of ​​the retaining web. As a result, the sealing element can be fixed, in particular axially, in a sealing bed formed by the radial contact area, the axial contact area of ​​the collar, and the axial contact area of ​​the retaining web. The collar can project beyond the retaining web radially or in a radial direction running transversely to the axial direction.

[0016] Advantageously, the retaining web can be designed such that the retaining web can limit a width of the annular gap in a region of the retaining web or of an annular gap formed between an inner wall of the bung socket and the retaining web when the bung plug is screwed into the bung socket, such that the sealing element cannot penetrate into or pass through a region of the annular gap located between the inner wall and the retaining web or into the annular gap. In particular, the retaining web can thus prevent the sealing element from penetrating the cylindrical region or from coming into contact with the internal thread. The width of the annular gap in the region of the retaining web can preferably be less than 0.5 mm. In an advantageous embodiment of the bung socket, the width of the annular gap in the region of the retaining web can be 0.4 mm.

[0017] Advantageously, the retaining web can form a stop defining a maximum screw-in depth of the bung plug into the bung socket, such that the retaining web or the stop can strike the start of the internal thread when the bung plug is screwed into the bung socket to the maximum screw-in depth. Even if the bung plug is screwed further or too deeply into the bung socket, in which case the sealing element can then also be partially or completely in the cylindrical area, i.e. partially or exclusively in contact with the cylindrical section, the sealing element cannot touch the start of the internal thread. Rather, the retaining web forming a stop strikes the start of the internal thread when the bung plug is screwed into the bung socket to the maximum screw-in depth. Any contact between the sealing element and the internal thread can thus be reliably ruled out.Local impressions of the sealing element can thus be safely avoided, so that the sealing effect is not impaired.

[0018] The bung plug assembly according to the invention comprises a bung socket having an internal thread and a bung plug according to the invention for arranging in the bung socket.

[0019] In an advantageous embodiment of the bung plug arrangement, the bung socket can have a conical section on the inner circumference with a longitudinal cross-section that decreases when viewed in the screwing direction and a cylindrical section that adjoins the conical section downstream of the conical section, viewed in the screwing direction, wherein the cylindrical section can have the internal thread. The conical section can have a first conical section and a second conical section that adjoins the first conical section downstream of the first conical section, wherein the first conical section can have a greater pitch or a smaller opening angle than the second conical section with respect to the screwing direction.

[0020] In an advantageous embodiment of the bung plug arrangement, the bung plug can be screwed into the bung socket in such a way that, when the bung plug is screwed into the bung socket, a sealing element of the bung plug can bear exclusively on the conical section forming a sealing bed, which can be achieved in particular by providing the retaining web or a suitable choice of the width of the annular gap in the region of the retaining web. An optimal sealing effect can be achieved by the sealing element bearing exclusively on the sealing bed of the conical section provided for this purpose. In particular, part of the first conical sub-section and the second conical sub-section can form the sealing bed. However, when the bung plug is screwed into the bung socket, the sealing element can, depending on the screw-in depth or.If the screw is screwed in too deeply, the seal may also contact the conical section and the cylindrical section, or only the cylindrical section. Advantageously, the sealing element should then not contact the beginning of the internal thread, which can be achieved by providing the retaining web.

[0021] In an advantageous embodiment of the bung plug arrangement, the cylindrical section can have a first cylindrical sub-section and a second cylindrical sub-section which, viewed in the screwing-in direction, follows the first cylindrical sub-section and adjoins the first cylindrical sub-section, wherein the first cylindrical sub-section can be free of the internal thread and the second cylindrical sub-section can have the internal thread. This makes it possible, depending on the embodiment of the bung plug arrangement or of the bung plug, to keep the sealing element safely or even more safely away from the internal thread, in particular if the bung plug has been screwed so deeply into the bung socket that the sealing element at least also rests against the cylindrical section or the first cylindrical sub-section.

[0022] Advantageously, the first cylindrical partial section can then have a length dimensioned such that contact of the sealing element with the internal thread or the beginning of the internal thread can be avoided. The length can correspond to a distance of the sealing bed from the beginning of the internal thread. In an advantageous embodiment of the bung plug arrangement, the first cylindrical partial section can have a length of at least 1.0 mm, preferably 1.0 mm to 1.5 mm, particularly preferably 1.1 mm, viewed in the screw-in direction. A distance of the sealing bed from the beginning of the internal thread viewed in the screw-in direction can therefore have these dimensions.

[0023] In an advantageous embodiment of the bung plug arrangement, a bung container, in particular an inner container for an intermediate bulk container, can form the bung nozzle. The bung plug can then be a "closed screw cap."

[0024] In an advantageous alternative embodiment of the bung plug assembly, a closure cap for placement at a bung opening of a bung container, in particular an inner container for an intermediate bulk container, can form the bung nozzle. The closure cap can then be an "open screw cap."

[0025] The bunghole container according to the invention, in particular an inner container for an intermediate bulk container, forms a bunghole spout. The bunghole container comprises a bunghole plug for placement in the bunghole spout. The bunghole and the bunghole plug form a bunghole plug arrangement according to the invention. The bunghole container can also be a drum. The bunghole container can form the bunghole spout on a top side. A bunghole container opening in the bunghole can then be directly closed by means of the bunghole plug.

[0026] The bunghole container closure according to the invention comprises a closure lid for arrangement at a bunghole container opening of a bunghole container, in particular an inner container for an intermediate bulk container. The closure lid forms a bunghole spout. The bunghole container closure comprises a bunghole plug for arrangement in the bunghole spout. The bunghole spout and the bunghole plug form a bunghole plug arrangement according to the invention. Accordingly, the closure lid can in turn have at least one bunghole opening, which can be closed with the bunghole plug.

[0027] The bunghole container according to the invention, in particular an inner container for an intermediate bulk container, comprises the bunghole container closure according to the invention. The bunghole container can also be a drum. The bunghole container can have the bunghole container opening on its upper side, at which the closure lid can be arranged. A bunghole opening in the bunghole nozzle can then be closed by means of the bunghole plug.

[0028] The closure cap or the bung plug or the plug, the sealing element, and the bung nozzle can be made of a plastic material, in particular PP and / or HDPE, for example, by injection molding. In particular, the closure cap can be made of HDPE and the bung plug or the plug can be made of PP. The sealing element can be made of an elastic material. The bung container or inner container can also be made of a plastic material.

[0029] The intermediate bulk container according to the invention comprises one of the bunghole containers according to the invention designed as an inner container. Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings.

[0030] They show:

[0031] Fig. 1 is a sectional view of a bung plug arrangement known from the prior art;

[0032] Fig. 2 is a detailed view of an area X shown in Fig. 1;

[0033] Fig. 3 is a sectional view of a bung plug arrangement according to the invention;

[0034] Fig. 4 is a detailed view of an area Y shown in Fig. 3; Fig. 5 is a sectional view of a bung socket of a bung socket arrangement according to the invention;

[0035] Fig. 6 is a detailed view of an area E shown in Fig. 5;

[0036] Fig. 7 is a perspective view of a bunghole container closure; Fig. 8 is a sectional view of the bunghole container closure.

[0037] 1 and 2 shows a bung plug arrangement 10 known from the prior art, comprising a bung socket 1 1 and a bung plug 13 partially arranged in a bung opening 12 of the bung socket 1 1. The bung socket 1 1 forms a conical section 14 on the inner circumference with a longitudinal cross-section that decreases when viewed in a screw-in direction 15 and a cylindrical section 16 that adjoins the conical section 14 following the conical section 14 when viewed in the screw-in direction 15, wherein the cylindrical section 16 forms an internal thread 17 of the bung socket 1 1.

[0038] The bung plug 13 comprises a plug 18, which has an external thread 19 intended for interaction with the internal thread 17 and, as viewed in the screwing direction 15, forms a circumferential collar 20 on the outer circumference in front of the external thread 19, and an annular sealing element 21 arranged on the plug 18 downstream of the collar 20 and in front of the external thread 19 on the outer circumference, as viewed in the screwing direction 15. The plug 18 is designed such that a diameter 22 of the plug 18 in a radial contact area 23 of the sealing element 21 on the plug 18 is exactly as large as a core diameter 24 of the external thread 19, which results in a reduced sealing effect, particularly in interaction with manufacturing-related influencing parameters. Between the bung socket 11 or an inner wall 25 of the bung socket 11 and the bung plug 13, an annular gap 26 is formed, which has a conical region 27 and a cylindrical region 28.In the present case, the bung plug 13 is screwed into the bung socket 11 in such a way that the sealing element 21 is located in both the conical region 27 and the cylindrical region 28, i.e., it rests against both the conical section 14 and the cylindrical section 16. The sealing element 21 therefore does not rest against a sealing bed of the conical section 14 intended for the sealing element 21 to rest on. If the bung plug 13 is screwed even deeper into the bung socket 11, the sealing element 21 strikes a beginning 29 of the internal thread 17, whereby the sealing element 21 is locally pressed in. This results in a further reduction in the sealing effect.

[0039] A summary of Figures 3 and 4 shows a bung plug arrangement 30 according to the invention, comprising a bung socket 31 and a bung plug 33 partially arranged in a bung opening 32 of the bung socket 31.

[0040] The bung socket 31 forms a conical section 34 on the inner circumference with a longitudinal cross-section that decreases when viewed in a screwing-in direction 35 and a cylindrical section 36 that adjoins the conical section 34 when viewed in the screwing-in direction 35, wherein the cylindrical section 36 forms an internal thread 37 of the bung socket 31.

[0041] The bung plug 33 comprises a plug 38, which has an external thread 39 intended for interaction with the internal thread 37 and, as viewed in the screwing direction 35, forms a circumferential collar 40 in front of the external thread 39 on the outer circumference, and an annular sealing element 41 arranged on the plug 38 downstream of the collar 40 and in front of the external thread 39 on the outer circumference, as viewed in the screwing direction 35. The plug 38 is designed such that a diameter 42 of the plug 38 in a radial contact area 43 of the sealing element 41 on the plug 38 is larger than a core diameter 44 of the external thread 39, so that the sealing element 41 bears against the bung socket 31 with an increased prestressing force, which results in an increased sealing effect, particularly regardless of manufacturing-related influencing parameters.Furthermore, the plug 38, viewed in the screw-in direction 35, forms a circumferential retaining web 45 for the sealing element 41 on the outer circumference, following the collar 40 and in front of the external thread 39, so that the sealing element 41 is arranged between the collar 40 and the retaining web 45 on the plug 38. In other words, the sealing element 41 bears against the plug 38 in the radial contact area 43 of the plug 38 provided between the collar 40 and the retaining web 45. In addition, the sealing element 41 bears against the plug 38 in an axial contact area 46 of the collar 40 and in an axial contact area 47 of the retaining web 45. As a result, the sealing element 41 is fixed, in particular axially, in a sealing bed formed by the radial contact area 43, the axial contact area 46 of the collar 40 and the axial contact area 47 of the retaining web 45. The collar 40 projects radially beyond the retaining web 45. Viewed in the screwing direction 35, it follows the retaining web 45 orThe plug 38 forms a cylindrical section 75 on the outer circumference of the radial contact area 43 and in front of the external thread 39, which is free of the external thread 39. The cylindrical section 75 is formed with a diameter 76 corresponding to the core diameter 44. The plug 38 can also form the cylindrical section 75 if no retaining web or the retaining web 45 is not provided.

[0042] An annular gap 49 is formed between the bung socket 31 or an inner wall 48 of the bung socket 31 and the bung plug 33, which gap has a conical region 50 and a cylindrical region 51. In the present case, the bung plug 33 is screwed into the bung socket 31 such that the sealing element 41 is located substantially in the conical region 50, i.e., substantially abuts the conical section 34. The sealing element 41 thus abuts a sealing bed of the conical section 34 provided for the abutment of the sealing element 41. The retaining web 45 prevents the sealing element 41 from penetrating into the cylindrical region 51. For this purpose, the retaining web 45 is designed such that the retaining web 45 limits a width 52 of the annular gap 49 in a region 53 of the retaining web 45, such that the sealing element 41 cannot penetrate into or pass through a region 54 of the annular gap 49 located between the inner wall 48 and the retaining web 45.Due to this design of the retaining web 45, the sealing element 41 is fixed in the screwing direction 35.

[0043] Even if the bung plug 33 is screwed further into the bung socket 31, in which case the sealing element 41 is then also partially or completely located in the cylindrical region 51, i.e. partially or exclusively abuts the cylindrical section 36, the sealing element 41 does not touch a start 55 of the internal thread 37, since the sealing element 41 cannot penetrate into or pass through the region 54 of the annular gap 49 located between the inner wall 48 and the retaining web 45. Rather, the retaining web 45 forming a stop 56 strikes the start 55 at a maximum screw-in depth of the bung plug 33 into the bung socket 31. Any contact between the sealing element 41 and the internal thread 37 can thus be ruled out. Local indentations of the sealing element 41 can thus be avoided, so that the sealing effect is not impaired.

[0044] A summary of Figures 5 and 6 shows a bung socket 57 of a bung socket arrangement according to the invention not shown further here.

[0045] The features of the bung socket 57 described below can also be seen in Figs. 3 and 4 for the bung socket 31, so that the following explanations can also be transferred to the bung socket 31.

[0046] The bung socket 57 forms a conical section 58 on the inner circumference with a longitudinal cross-section that decreases when viewed in a screw-in direction 62 and a cylindrical section 60 that adjoins the conical section 58 and forms an internal thread 59 when viewed in the screw-in direction 62. The conical section 59 has a first conical section 61 and a second conical section 63 that adjoins the first conical section 61 when viewed in the screw-in direction 62, the first conical section 61 having a greater pitch or a smaller opening angle than the second conical section 63 when viewed in the screw-in direction 62.A part of the first conical section 61 and the second conical section 63 form a sealing bed 64 provided for the contact of a sealing element (not shown here) of a bung plug (likewise not shown here) of the bung plug arrangement. Furthermore, the cylindrical section 60 has a first cylindrical section 65 and a second cylindrical section 66 which, viewed in the screwing direction 62, adjoins the first cylindrical section 65, wherein the first cylindrical section 65 is free of the internal thread 59 and the second cylindrical section 66 forms the internal thread 59. A distance 67, viewed in the screwing direction 62, between a start 68 of the internal thread 59 and the sealing bed 64 ora length of the first cylindrical section 65 viewed in the screwing direction 62 is dimensioned such that cutting of the sealing element into the internal thread 59 when screwing the bung plug into the bung socket 57 can be excluded, in particular if the bung plug has been screwed too deeply into the bung socket 57.

[0047] A synopsis of Figs. 7 and 8 shows a bunghole container closure 69, which comprises a closure lid 70 designed as an "open screw cap" with an internal thread 71 for arranging or screwing onto a bunghole container opening (not shown here) of an inner container (likewise not shown here) for an intermediate bulk container, wherein the closure lid 70 forms a bunghole nozzle 72, wherein the bunghole container closure 69 comprises a bung plug 73 screwed into the bunghole nozzle 72, wherein the bunghole nozzle 72 and the bung plug 73 form a bung plug arrangement 74. Reference is made to the description of Figs. 2 to 6 for additional details.

Claims

Patent claims 1. Bung plug (33, 73) for arrangement in a bung socket (31, 57, 72), comprising a plug (38) which has an external thread (39) intended to cooperate with an internal thread (37, 59) of the bung socket, and an annular sealing element (41) arranged on the outer circumference of the plug in front of the external thread, as viewed in a screwing direction (35, 62) of the bung plug into the bung socket, characterized in that the plug is designed such that a diameter (42) of the plug in a radial contact area (43) of the sealing element on the plug is greater than a core diameter (44) of the external thread and / or that the plug has a circumferential holding web (45) for the sealing element on the outer circumference, in front of the external thread, as viewed in the screwing direction, wherein the sealing element is arranged on the plug in front of the holding web.

2. Bung plug according to claim 1, characterized in that that the diameter (42) of the plug (38) in the radial contact area (43) of the sealing element (41) on the plug is 1.0 mm to 2.0 mm, preferably 1.2 mm to 1.6 mm, particularly preferably 1.4 mm, larger than the core diameter (44) of the external thread (39).

3. Bung plug according to claim 1 or 2, characterized in that the external thread (39) is designed as a G2 thread.

4. Bung plug according to one of the preceding claims, characterized in that the plug (38) has a circumferential collar (40) on the outer circumference in front of the external thread (39) as viewed in the screwing-in direction (35, 62), wherein the sealing element (41) is arranged downstream of the collar on the plug as viewed in the screwing-in direction.

5. Bung plug according to one of the preceding claims, characterized in that the holding web (45) is designed such that the holding web delimits a width (52) of an annular gap (49) formed between an inner wall (48) of the bung socket and the holding web when the bung plug (33, 73) is screwed into the bung socket (31, 57, 72), such that the sealing element (41) cannot penetrate into the annular gap.

6. Bung plug according to one of the preceding claims, characterized in that the holding web (45) forms a stop (56) defining a maximum screw-in depth of the bung plug (33, 73) into the bung socket (31, 57, 72), such that the holding web when The bung plug screwed into the bung socket to its maximum screw-in depth strikes a beginning (55, 68) of the internal thread (37, 59).

7. Bung plug assembly (30, 74) comprising a bung socket (31, 57, 72) having an internal thread (37, 59) and a bung plug (33, 73) for placement in the bung socket according to any one of the preceding claims.

8. Bung plug arrangement according to claim 7, characterized in that the bung socket (31, 57, 72) has on the inner circumference a conical section (34, 58) with a longitudinal cross-section which decreases when viewed in the screwing-in direction (35, 62) and a cylindrical section (36, 60) which adjoins the conical section following the conical section when viewed in the screwing-in direction, wherein the cylindrical section has the internal thread (37, 59).

9. Bung plug arrangement according to claim 8, characterized in that the bung plug (33, 73) can be screwed into the bung socket (31, 57, 72) in such a way that when the bung plug is screwed into the bung socket, a sealing element (41) of the bung plug bears exclusively against the conical section (34, 58) forming a sealing bed (64).

10. Bung plug arrangement according to claim 8 or 9, characterized in that the cylindrical section (36, 60) has a first cylindrical section (65) and a section which, viewed in the screwing-in direction (35, 62), follows the first cylindrical section at the first cylindrical section adjoining a second cylindrical section (66), wherein the first cylindrical section is free of the internal thread (37, 59) and the second cylindrical section has the internal thread.

11. Bung plug arrangement at least according to claim 9 and 10, characterized in that a distance (67) of the sealing bed (64) from a beginning (55, 68) of the internal thread (37, 59) is at least 1.0 mm, preferably 1.0 mm to 1.5 mm, particularly preferably 1.1 mm.

12. Bung plug arrangement according to one of claims 7 to 11, characterized in that a bung container, in particular an inner container for an intermediate bulk container, forms the bung nozzle (31, 57).

13. Bung plug arrangement according to one of claims 7 to 11, characterized in that a closure lid (70) for arranging at a bung container opening of a bung container, in particular an inner container for an intermediate bulk container, forms the bung nozzle (31, 57, 72).

14. A bunghole container, in particular an inner container for an intermediate bulk container, wherein the bunghole container forms a bunghole nozzle (31, 57), wherein the bunghole container comprises a bunghole plug (33) for arrangement in the bunghole nozzle, wherein the bunghole nozzle and the bunghole plug form a bunghole plug arrangement (30) according to one of claims 7 to 11.

15. A bunghole container closure (69), comprising a closure lid (70) for arranging at a bunghole container opening of a bunghole container, in particular an inner container for an intermediate bulk container, wherein the closure lid forms a bung socket (31, 57, 72), wherein the bunghole container closure has a bung plug (33, 73) for arrangement in the bung socket, wherein the bung socket and the bung plug form a bung plug arrangement (30, 74) according to one of claims 7 to 11.

16. A bunghole container, in particular an inner container for an intermediate bulk container, comprising a bunghole container closure (69) according to claim 15.

17. An intermediate bulk container comprising a bunghole container designed as an inner container according to one of claims 14 or 16.

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