Nozzle plug, nozzle plug structure, container with nozzle hole, container closure device with nozzle hole, and intermediate bulk container

Abstract

The present invention relates to a nozzle plug (33) positioned on a nozzle neck (31), the nozzle plug (33) having a plug (38) having an external thread (39) configured to engage with an internal thread (37) of the nozzle neck, and an annular sealing element (41) positioned on the outer circumference of the plug in front of the external thread when viewed in the screwing direction (35) of the nozzle plug into the nozzle neck, wherein the diameter (42) of the plug in the radial contact area (43) between the sealing element and the plug is greater than the small diameter (44) of the external thread, and / or the plug has a circumferential retaining web (45) positioned on the outer circumference in front of the external thread when viewed in the screwing direction, and the sealing element is positioned on the plug in front of the retaining web when viewed in the screwing direction.

Description

Technical Field

[0001] The present invention relates to a base plug (bung plug, bung stopper) disposed in a base neck (bung neck), the base plug having a plug with an external thread for engaging with an internal thread of the base neck, and an annular seal element disposed on the outer periphery of the plug in front of (in front) the external thread when looking in the screwing direction of the base plug into the base neck. Further, the present invention relates to including a base neck and a base plug. Also, the present invention relates to a container with a base hole (container with a bung hole). In addition, the present invention relates to a closure for a container with a base hole. Further, the present invention relates to an intermediate bulk container.

Background Art

[0002] Containers with a base hole, particularly intermediate bulk containers (IBCs), generally have a container opening with a base hole that is closed by a screw cap and / or a closure. There are various embodiments for the screw cap and / or the closure. In particular, there are so-called "closed screw caps" and "open screw caps". The "closed screw cap" and / or the base plug are for directly disposing on the base neck formed by the container with a base hole to close the container opening with a base hole of the container with a base hole. The "open screw cap" and / or the closure for a container with a base hole have a closure lid disposed on the container opening with a base hole of the container with a base hole, the closure lid forming the base neck, and the closure for a container with a base hole including a base plug disposed in the base neck. Thus, the closure lid is provided with at least one base opening (bung opening) that can be closed by the base plug.

[0003] Generally, a nozzle plug comprises a plug with an external thread for engaging with the internal thread of the nozzle neck, and an annular sealing element positioned on the outer circumference of the plug in front of the external thread when viewed in the direction of screwing the nozzle plug into the nozzle neck. In this case, the plug is configured such that the diameter of the plug in the axial contact area of ​​the sealing element with respect to the plug is exactly equal to the smallest diameter (root diameter) of the external thread. This, combined with the manufacturing-related influences described later, often leads to a reduction in the sealing effect. The external thread of a nozzle plug for a closure cover is often configured as a G2 thread (2-inch parallel pipe thread).

[0004] These types of screw caps or closures are generally mass-produced by injection molding processes from plastic materials suitable for packaging hazardous materials, such as PP and / or HDPE. The individual components of the screw caps and / or closures—for example, in the case of "open-type screw caps" and / or container closures with nozzles, the lid, nozzle plug, and sealing element—are manufactured using multiple injection molding tools (injection molds). This process often results in shrinkage and contraction due to material and process factors, negatively impacting the dimensional accuracy of the parts. Furthermore, the fact that the dimensions of the parts can vary from batch (lot) to batch, or due to tool (mold)-related measurements or process influences, exacerbates the problem. [Overview of the project] [Problems that the invention aims to solve]

[0005] Regardless of these circumstances, components must always fit together to produce the intended interaction, particularly the required sealing effect. However, this goal is often not achieved due to the aforementioned influencing factors, resulting not only in a high defect rate for pre-installed screw caps and / or closures, but also in the possibility of leakage in containers with nozzle necks and / or nozzle holes for use with screw caps and / or closures, especially if defects are overlooked during inspection in the manufacturing process.

[0006] In conventional nozzle plugs, another problem arises from the elastic deformation of the sealing element when the nozzle plug is positioned on the nozzle neck. When the nozzle plug is screwed onto the nozzle neck, the sealing element first enters the conical region of the annular gap formed between the nozzle plug and the nozzle neck, generally in the conical portion of the nozzle neck. However, if the nozzle plug is screwed on further, or too deeply into the nozzle neck, the sealing element is often pushed into the cylindrical region of the annular gap in the cylindrical portion of the nozzle neck following the conical portion, when viewed in the screwing direction. As soon as the sealing element contacts the starting point of the internal thread on the cylindrical portion, a localized depression is formed in the sealing element. This unfortunately reduces the sealing effect.

[0007] Therefore, an object of the present invention is to propose a nozzle plug, a nozzle plug structure, a container with a nozzle hole, a container closure device with a nozzle hole, and an intermediate bulk container that enable more reliable sealing of the nozzle neck. [Means for solving the problem]

[0008] This objective is achieved by a nozzle plug having the features of claim 1, a nozzle plug structure having the features of claim 7, a container with a nozzle hole having the features of claim 14, a container closure with a nozzle hole having the features of claim 15, a container with a nozzle hole having the features of claim 16, and an intermediate bulk container having the features of claim 17.

[0009] In the following, the terms “front” and “rear,” which should be understood spatially, such as “front of the external thread,” “front of the retaining web,” “rear of the collar,” or “rear of the cone,” refer to the direction in which the nozzle plug is threaded into the nozzle neck, and this threading direction is the direction extending axially with respect to the nozzle plug and / or nozzle neck.

[0010] A nozzle plug according to the present invention for placement on a nozzle neck comprises a plug having an external thread configured to engage with an internal thread of the nozzle neck, and an annular sealing element positioned on the outer circumference of the plug in front of the external thread when viewed in the screwing direction of the nozzle plug into the nozzle neck, wherein the diameter of the plug in the radial contact area between the sealing element and the plug is greater than the small diameter (root diameter) of the external thread, and / or the plug has a circumferential retaining web positioned on the outer circumference in front of the external thread when viewed in the screwing direction, and the sealing element is positioned in front of the retaining web when viewed in the screwing direction.

[0011] Therefore, according to a first aspect of the present invention, the plug can be configured such that the diameter of the plug in the radial contact region where the plug and the sealing element contact is larger than the small diameter of the external thread. In other words, the present invention aims to modify the shape of the plug and / or nozzle by partially increasing the diameter of the plug and / or nozzle in the radial contact region between the sealing element and the plug, i.e., the seal seat, thereby reducing the width of the annular gap created between the plug and the nozzle neck when the plug is screwed into the nozzle neck, and thereby causing the sealing element to contact the nozzle neck with increased preload. As a result, the reliability of the seal of the nozzle neck can be improved regardless of the aforementioned influencing parameters. This can also significantly reduce the percentage of defective products.

[0012] According to a second aspect of the present invention, provided in lieu of or in addition to the first aspect, the plug has a circumferential retaining web for a sealing element in front of the outer external threads on its circumference, and the sealing element is positioned in front of the retaining web in the radial contact area with the plug. The retaining web limits the radial contact area and holds the sealing element, allowing the sealing element to contact axially and fixing the sealing element in the axial direction. This ensures that, when the second aspect is used in addition to the first aspect, the sealing element does not slip out of the radial contact area when the nozzle plug is not screwed in, but also, independently of the first feature, when the nozzle plug is screwed in, the sealing element is held in a predetermined area between the nozzle neck and the nozzle plug, and is not pulled into the cylindrical area of ​​the annular gap in particular. This prevents the sealing element from contacting the start end of the internal threads. In other words, it becomes possible to configure the nozzle plug such that, regardless of the depth to which the nozzle plug is screwed into the nozzle neck, the sealing element cannot come into contact with the internal thread and / or the starting end of the internal thread. This avoids the reduction in the sealing effect of the sealing element that occurs when the starting end of the internal thread is locally recessed.

[0013] In an effective embodiment of the nozzle plug, both the first and second embodiments are used in the nozzle plug, thereby achieving a particularly reliable seal of the nozzle neck.

[0014] The spout neck may be the spout neck of a container with a spout hole, in particular the spout neck of an inner container for an intermediate bulk container. Alternatively, the spout neck may be the spout neck of a closing lid positioned at the spout hole opening of a container with a spout hole, in particular the spout neck of a closing lid positioned at the spout hole opening of an inner container for an intermediate bulk container.

[0015] In a preferred embodiment of the nozzle plug, the diameter of the plug in the radial contact area between the sealing element and the plug can be 1.0 mm to 2.0 mm larger, preferably 1.2 mm to 1.6 mm larger, and particularly preferably 1.4 mm larger than the small diameter of the external thread.

[0016] In a preferred embodiment of the plug socket, the external thread may be configured as a G2 thread. In this case, the internal thread may also be configured as a G2 thread. In either case, this refers to a G2 thread according to the latest version of the DIN ISO 228 standard as of the priority date of this patent application.

[0017] In an advantageous embodiment of this nozzle plug, the plug may have a circumferential collar on its outer circumference in front of the external thread when viewed in the screwing direction, and the sealing element may be positioned behind the collar when viewed in the screwing direction. In this case, the sealing element can contact the plug in the axial contact region of the collar, so that when the nozzle plug is screwed into the nozzle neck, the sealing element can be pushed in the screwing direction by the collar. Since the collar can be positioned in front of the retaining web, the sealing element can be positioned in the plug between the collar and the retaining web. In other words, the sealing element can contact the plug in the radial contact region of the plug provided between the collar and the retaining web. Furthermore, the sealing element can contact the plug in the axial contact regions of the collar and the retaining web. Thus, the sealing element is fixed particularly axially to a seal bed (seal base, sealing surface) formed by the radial contact region, the axial contact region of the collar, and the axial contact region of the retaining web. The collar may be made to protrude radially beyond the retaining web, i.e., radially extending laterally with respect to the axial direction.

[0018] Advantageously, the retaining web can be configured so that, when the nozzle plug is screwed into the nozzle neck, the retaining web limits the width of the annular gap formed in the region of the retaining web and / or between the inner wall of the nozzle neck and the retaining web, thereby preventing the sealing element from entering and / or passing through the annular gap located between the inner wall and the retaining web. Thus, the retaining web can prevent the sealing element from entering the cylindrical region and / or from contacting the internal thread. The width of the annular gap in the region of the retaining web is preferably less than 0.5 mm. In an advantageous embodiment of the nozzle plug, the width of the annular gap in the region of the retaining web can be 0.4 mm.

[0019] Advantageously, the retaining web can constitute a stopper that determines the maximum screwing depth of the nozzle plug into the nozzle neck, and when the nozzle plug is screwed into the nozzle neck to its maximum screwing depth, the retaining web and / or stopper can contact the beginning of the internal thread. Even if the nozzle plug is screwed further or excessively deep into the nozzle neck, and the sealing element may be partially or entirely located within the cylindrical region, i.e., the sealing element may be partially or entirely in contact with the cylindrical portion, the sealing element cannot contact the beginning of the internal thread. Rather, at the maximum screwing depth of the nozzle plug into the nozzle neck, the retaining web forming the stopper contacts the beginning of the internal thread. Thus, any contact between the sealing element and the internal thread can be reliably prevented. Consequently, localized depressions in the sealing element can be reliably avoided so that the sealing effect is not affected.

[0020] The nozzle plug structure according to the present invention includes a nozzle neck having an internal thread and a nozzle plug according to the present invention for placement on the nozzle neck.

[0021] In an advantageous embodiment of the nozzle plug structure, the nozzle neck can have a conical portion on its inner circumference that has a smaller longitudinal cross-section when viewed in the screwing direction, and a cylindrical portion adjacent to the conical portion behind (inside) the conical portion when viewed in the screwing direction, and an internal thread can be provided in the cylindrical portion. The conical portion can have a first conical portion and a second conical portion adjacent to the first conical portion behind the first conical portion, and the first conical portion can have a larger inclination angle and / or a smaller opening angle with respect to the screwing direction than the second conical portion.

[0022] In an advantageous embodiment of the nozzle plug structure, the nozzle plug can be screwed into the nozzle neck such that, when the nozzle plug is screwed into the nozzle neck, the sealing element of the nozzle plug contacts only the conical portion that forms the seal bed. This can be achieved, in particular, by providing a retaining web and / or by appropriately selecting the width of the annular gap in the area of ​​the retaining web. Optimal sealing effect can be achieved by the sealing element contacting only the seal bed of the conical portion provided for this purpose. In particular, a portion of the first conical portion and the second conical portion can form the seal bed. However, when the nozzle plug is screwed into the nozzle neck, depending on the screwing depth and / or if screwed in too deeply, the sealing element may contact both the conical portion and the cylindrical portion, or only the cylindrical portion. Advantageously, the sealing element should not contact the start end of the internal thread, which can be achieved by providing a retaining web.

[0023] In an advantageous embodiment of the nozzle plug structure, the cylindrical portion may have, when viewed in the screwing direction, a first cylindrical portion and a second cylindrical portion adjacent to the first cylindrical portion behind the first cylindrical portion, wherein the first cylindrical portion may not have an internal thread and the second cylindrical portion may have an internal thread. Thus, depending on the embodiment of the nozzle plug structure and / or the nozzle plug, it becomes possible to reliably, or even more reliably, keep the sealing element away from the internal thread, particularly when the nozzle plug is screwed very deeply into the nozzle neck and the sealing element is in contact with at least the cylindrical portion and / or the first cylindrical portion.

[0024] In this case, advantageously, the length of the first cylindrical portion can be dimensioned such that, when viewed along the screwing direction, the sealing element can be prevented from contacting the internal thread and / or the starting point of the internal thread. This length can correspond to the distance of the sealing bed from the starting point of the internal thread. In an advantageous embodiment of the base plug structure, when viewed along the screwing direction, the length of the first cylindrical portion can be at least 1.0 mm, preferably 1.0 mm to 1.5 mm, particularly preferably 1.1 mm. Accordingly, when viewed in the screwing direction, the distance of the sealing bed from the starting end of the internal thread can be these dimensions.

[0025] In an advantageous embodiment of the base plug structure, the inner container for a container with a base hole, particularly for an intermediate bulk container, can be provided with a base neck (realize a base neck). In this case, the base plug can be a "closed screw cap".

[0026] In another advantageous embodiment of the base plug structure, a closure lid arranged at the container opening with a base hole of the container with a base hole, particularly at the container opening with a base hole of the inner container for an intermediate bulk container, may be configured to form a base neck. In this case, the closure lid can be an "open screw cap".

[0027] The container with a base hole according to the present invention, particularly the inner container for an intermediate bulk container, realizes a base neck. The container with a base hole has a base plug arranged at the base neck, and the base neck and the base plug realize the base plug structure according to the present invention. The container with a base hole may be a drum can. The container with a base hole can be provided with a base neck on the upper surface. In this case, the container opening with a base hole of the base neck can be directly closed by the base plug.

[0028] The container closure with a base hole according to the present invention includes a closure lid disposed at the container opening with a base hole of the container with a base hole, particularly at the container opening with a base hole of the inner container for an intermediate bulk container. The closure lid realizes a base neck, and the container closure with a base hole has a base plug disposed at the base neck. The base neck and the base plug constitute the base plug structure according to the present invention. Therefore, the closure lid can have, as a part thereof, at least one base opening that can be closed by the base plug.

[0029] The container with a base hole according to the present invention, particularly the inner container for an intermediate bulk container, has the container closure with a base hole according to the present invention. The container with a base hole may be a drum can. The container with a base hole may have a container opening with a base hole on the upper surface, and the closure lid can be disposed at the container opening with a base hole. In this case, the base opening of the base neck can be closed by the base plug.

[0030] The closure lid and / or the base plug and / or the plug, the sealing element, and the base neck can be manufactured from a plastic material, particularly PP (polypropylene) and / or HDPE (high-density polyethylene), for example, by an injection molding process. In particular, the closure lid can be manufactured from HDPE, and the base plug and / or the plug can be manufactured from PP. The sealing element can be formed of an elastic material. The container with a base hole and / or the inner container can also be formed from a plastic material.

[0031] The intermediate bulk container according to the present invention includes one of the containers with a base hole according to the present invention configured as an inner container.

[0032] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

Brief Description of the Drawings

[0033] [Figure 1] FIG. 1 shows a cross-sectional view of a base plug structure known in the prior art. [Figure 2] FIG. 2 shows a detailed view of the region X shown in FIG. 1. [Figure 3]Figure 3 shows a cross-sectional view of the nozzle plug structure according to the present invention. [Figure 4] Figure 4 shows a detailed view of region Y shown in Figure 3. [Figure 5] Figure 5 shows a cross-sectional view of the nozzle neck of the nozzle plug structure according to the present invention. [Figure 6] Figure 6 shows a detailed view of region E shown in Figure 5. [Figure 7] Figure 7 shows a perspective view of a container closure device with a nozzle hole. [Figure 8] Figure 8 shows a cross-sectional view of a container closure device with a nozzle hole. [Modes for carrying out the invention]

[0034] Figures 1 and 2 together show a conventionally known nozzle plug structure (bung plug structure) 10, which comprises a nozzle neck (bung neck) 11 and a nozzle plug (bung plug) 13 partially positioned in the nozzle opening (bung opening) 12 of the nozzle neck 11.

[0035] The nozzle neck 11 has a conical portion 14 whose longitudinal cross-section becomes narrower when viewed in the screw-in direction 15, and a cylindrical portion 16 that is behind (inside) the conical portion 14 and is in contact with the conical portion on its inner circumference when viewed in the screw-in direction 15, and the cylindrical portion 16 forms the internal thread 17 of the nozzle neck 11.

[0036] The nozzle plug 13 has a plug 18 having an external thread 19 that engages with an internal thread 17, and a circumferential collar 20 located on the outer circumference in front of (towards) the external thread 19 when viewed in the screwing direction 15, and an annular sealing element 21 located on the outer circumference of the plug 18 behind the collar 20 and in front of the external thread 19 when viewed in the screwing direction 15. The plug 18 is configured such that the diameter 22 of the plug 18 in the radial contact area 23 between the sealing element 21 and the plug 18 is exactly the same size as the small diameter (root diameter) 24 of the external thread 19, which, combined with manufacturing-related influencing factors, results in a reduced sealing effect. An annular gap 26 is formed between the nozzle neck 11 and / or the inner wall 25 of the nozzle neck 11 and the nozzle plug 13, and this annular gap 26 has a conical region 27 and a cylindrical region 28. In this embodiment, the nozzle plug 13 is screwed into the nozzle neck 11, and the sealing element 21 is located in both the conical region 27 and the cylindrical region 28, that is, it is in contact with both the conical portion 14 and the cylindrical portion 16. Therefore, the sealing element 21 does not contact the sealing bed (sealing base, sealing surface) of the conical portion 14 which is intended to contact the sealing element 21. If the nozzle plug 13 is screwed further into the nozzle neck 11, the sealing element 21 will come into contact with the internal thread 17, resulting in a localized depression of the sealing element 21. Consequently, the sealing effect will be further reduced.

[0037] Figures 3 and 4 together show a nozzle plug structure 30, which comprises a nozzle neck 31 and a nozzle plug 33, a portion of which is located within the nozzle opening 32 of the nozzle neck 31.

[0038] The nozzle neck 31 has a conical portion 34 whose longitudinal cross-section becomes smaller when viewed in the screw-in direction 35, and a cylindrical portion 36 that is behind (inside) the conical portion 34 and connected to the conical portion 34 on its inner circumference when viewed in the screw-in direction 35, and the cylindrical portion 36 forms the internal thread 37 of the nozzle neck 31.

[0039] The nozzle plug 33 has a plug 38 having an external thread 39 configured to engage with an internal thread 37, and a circumferential collar 40 on its outer circumference in front of the external thread 39 when viewed in the threading direction 35, and further having an annular sealing element 41 positioned on the outer circumference of the plug 38 behind the collar 40 and in front of the external thread 39 when viewed in the threading direction 35. The plug 38 is configured such that the diameter 42 of the plug 38 in the radial contact area 43 between the sealing element 41 and the plug 38 is larger than the small diameter 44 of the external thread 39, so that the sealing element 41 contacts the nozzle neck 31 with increased preload, improving the sealing effect without particularly depending on manufacturing-related influencing parameters. Furthermore, the plug 38 has a circumferential retaining web 45 for the sealing element 41 on its outer circumference behind the collar 40 and in front of the external thread 39 when viewed in the threading direction 35, and the sealing element 41 is positioned on the plug 38 between the collar 40 and the retaining web 45. In other words, the sealing element 41 contacts the plug 38 in the radial contact area 43 of the plug 38, which is located between the collar 40 and the retaining web 45. Furthermore, the sealing element 41 contacts the plug 38 in the axial contact area 46 of the collar 40 and the axial contact area 46 of the retaining web 45. Thus, the sealing element 41 is fixed particularly axially to the seal 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 protrudes radially beyond the retaining web 45. When viewed in the threading direction 35, the plug 38 forms a cylindrical portion 75 on its outer circumference, behind the retaining web 45 and / or the radial contact area 43 and before the external thread 39, which is formed with a diameter 76 corresponding to the small diameter 44. The plug 38 can form the cylindrical portion 75 even without the retaining web and / or without the retaining web 45.

[0040] An annular gap 49 is formed between the nozzle neck 31 and / or the inner wall 48 of the nozzle neck 31 and the nozzle plug 33, and this annular gap 49 has a conical region 50 and a cylindrical region 51. In this example, the nozzle plug 33 is screwed onto the nozzle neck 31 such that the seal element 41 is substantially located in the conical region 50, i.e., substantially in contact with the conical portion 34. Thus, the seal element 41 contacts the seal bed of the conical portion 34 for contact with the seal element 41. In this case, the retaining web 45 prevents the seal element 41 from entering the cylindrical region 51. For this purpose, the retaining web 45 is configured to limit the width 52 of the annular gap 49 in the region 53 of the retaining web 45, thereby preventing the seal element 41 from entering and / or passing through the region 54 of the annular gap 49 located between the inner wall 48 and the retaining web 45. This configuration of the retaining web 45 fixes the seal element 41 in the screwing direction 35.

[0041] Even when the nozzle plug 33 is further screwed into the nozzle neck 31, and the sealing element 41 may be positioned partially or entirely within the cylindrical region 51, that is, may be in partial or complete contact with the cylindrical portion 36, the sealing element 41 cannot enter and / or pass through the region 54 of the annular gap 49 located between the inner wall 48 and the retaining web 45, and therefore does not contact the starting point 55 of the internal thread 37. Rather, at the maximum screwing depth of the nozzle plug 33 into the nozzle neck 31, the retaining web 45 forming the stopper 56 abuts against the starting point 55. This prevents any contact between the sealing element 41 and the internal thread 37. Thus, local depressions in the sealing element 41 can be avoided, and the sealing effect is not affected.

[0042] Looking at Figures 5 and 6 together, we can see the nozzle neck 57 of the nozzle neck device according to the present invention, which is not shown in detail in this example.

[0043] The features of the ferrule neck 57 described below can also be seen in the ferrule neck 31 in Figures 3 and 4, so the following description can also be applied to the ferrule neck 31.

[0044] The nozzle neck 57 has a conical portion 58 with a smaller longitudinal cross-section when viewed in the screw-in direction 62, and a cylindrical portion 60 on its inner circumference that is behind the conical portion 58 and adjacent to the conical portion 58 when viewed in the screw-in direction 62, and this cylindrical portion 60 forms an internal thread 59. The conical portion 59 has a first conical portion 61 and a second conical portion 63 adjacent to the first conical portion 61 when viewed in the screw-in direction 62, and the first conical portion 61 has a larger inclination angle and / or a smaller opening angle with respect to the screw-in direction 62 than the second conical portion 63. The first conical portion 61 and a part of the second conical portion 63 form a seal bed 64 which is provided so as to be in contact with the seal element (not shown in this example) of the nozzle plug structure (not shown in this example) of the nozzle plug structure. Furthermore, the cylindrical portion 60 has a first cylindrical portion 65 and a second cylindrical portion 66 adjacent to the first cylindrical portion 65 in the screwing direction 62, the first cylindrical portion 65 does not have an internal thread 59, and the second cylindrical portion 66 has an internal thread 59. The distance 67 between the starting point 68 of the internal thread 59 and the seal bed 64 in the screwing direction 62, and / or the length of the first cylindrical portion 65 in the screwing direction 62 are sized to prevent the seal element from biting into the internal thread 59 when the nozzle plug is screwed into the nozzle neck 57, especially when the nozzle plug is screwed in too deeply into the nozzle neck 57.

[0045] Figures 7 and 8 together show a container closure 69 with a mouthpiece hole, which is positioned and / or screwed into a container opening with a mouthpiece hole (not shown in this example) of an inner container (not shown in this example) for an intermediate bulk container. The mouthpiece hole 69 has a mouthpiece plug 73 that screws into the mouthpiece neck 72, and the mouthpiece neck 72 and mouthpiece plug 73 constitute a mouthpiece plug structure 74. See the explanation of Figures 2 to 6 for further details.

Claims

1. A nozzle plug (33, 73) positioned on a nozzle neck (31, 57, 72), wherein the nozzle plug (33, 73) has a plug (38) having an external thread (39) configured to engage with the internal thread (37, 59) of the nozzle neck (31, 57, 72), and an annular sealing element (41) positioned on the outer circumference of the plug in front of the external thread when viewed in the screwing direction (35, 62) of the nozzle plug into the nozzle neck, The plug is characterized in that the diameter (42) of the plug in the radial contact region (43) between the sealing element and the plug is greater than the small diameter (44) of the external thread, and / or the plug has a circumferential retaining web (45) located on the outer circumference in front of the external thread when viewed in the screwing direction (35, 62), and the sealing element is located in front of the retaining web when viewed in the screwing direction.

2. In the plug socket according to claim 1, A nozzle plug characterized in that the diameter (42) of the plug (38) in the radial contact region (43) between the sealing element (41) and the plug (38) is 1.0 mm to 2.0 mm larger, preferably 1.2 mm to 1.6 mm larger, and particularly preferably 1.4 mm larger than the small diameter (44) of the external thread (39).

3. In the plug socket according to claim 1 or 2, A mouthpiece plug characterized in that the external thread (39) is configured as a G2 thread.

4. In the plug socket according to any one of claims 1 to 3, The plug (38) is characterized in that it has a circumferential collar (40) on its outer circumference in front of the external thread (39) when viewed in the screwing direction (35, 62), and the sealing element (41) is positioned on the plug behind the collar when viewed in the screwing direction.

5. In the plug socket according to any one of claims 1 to 4, A nozzle plug characterized in that the retaining web (45) is configured to limit the width (52) of the annular gap (49) formed between the inner wall (48) of the nozzle neck (31, 57, 72) and the retaining web when the nozzle plug (33, 73) is screwed onto the nozzle neck, so that the sealing element (41) cannot enter the annular gap.

6. In the plug socket according to any one of claims 1 to 5, A nozzle plug characterized in that the retaining web (45) constitutes a stopper (56) that determines the maximum screwing depth of the nozzle plug (33, 73) into the nozzle neck (31, 57, 72), and the retaining web is configured to contact the starting ends (55, 68) of the internal threads (37, 59) when the nozzle plug is screwed into the nozzle neck to its maximum screwing depth.

7. A base plug structure (30, 74), A nozzle plug structure (30, 74) comprising a nozzle neck (31, 57, 72) having internal threads (37, 59), and a nozzle plug (33, 73) according to any one of claims 1 to 6 for placement on the nozzle neck.

8. In the plug base structure according to claim 7, The nozzle plug structure is characterized in that the nozzle neck (31, 57, 72) has a conical portion (34, 58) on its inner circumference that has a smaller vertical cross-section when viewed in the screwing direction, and a cylindrical portion (36, 60) behind the conical portion and adjacent to the conical portion when viewed in the screwing direction, and the cylindrical portion has the internal thread (37, 59).

9. In the plug structure according to claim 8, A nozzle plug structure characterized in that, when the nozzle plug is screwed onto the nozzle neck, the nozzle plug (33, 73) can be screwed onto the nozzle neck (31, 57, 72) such that the sealing element (41) of the nozzle plug contacts only the conical portions (34, 58) that form the sealing bed (64).

10. In the plug base structure according to claim 8 or 9, The nozzle plug structure is characterized in that the cylindrical portion (36, 60) has, when viewed in the screwing direction (35, 62), a first cylindrical portion (65) and a second cylindrical portion (66) adjacent to the first cylindrical portion behind the first cylindrical portion, the first cylindrical portion does not have the internal thread (37, 59), and the second cylindrical portion has the internal thread.

11. In the plug base structure according to claim 10, which references claim 9, A nozzle plug structure characterized in that the distance (67) from the starting point (55, 68) of the internal thread (37, 59) to the seal bed (64) is at least 1.0 mm, preferably 1.0 mm to 1.5 mm, and particularly preferably 1.1 mm.

12. In the plug base structure according to any one of claims 7 to 11, A nozzle plug structure characterized in that the inner container for a container with a nozzle hole, particularly for an intermediate bulk container, realizes the aforementioned nozzle neck (31, 57).

13. In the plug base structure according to any one of claims 7 to 11, A nozzle plug structure characterized in that a closing lid (70) positioned at the opening of a container with a nozzle hole, particularly at the opening of an inner container for an intermediate bulk container, realizes the nozzle neck (31, 57, 72).

14. A container with a nozzle hole, particularly an inner container for an intermediate bulk container, A container with a nozzle hole, wherein the container with a nozzle hole has a nozzle neck (31, 57), the container with a nozzle hole has a nozzle plug (33) disposed on the nozzle neck, and the nozzle neck and the nozzle plug realize a nozzle plug structure (30) according to any one of claims 7 to 11.

15. A container closure device with a nozzle hole (69), A container closure device for a container with a nozzle hole, comprising a closing lid (70) positioned on the opening of the container with a nozzle hole of a container with a nozzle hole, particularly the opening of the container with a nozzle hole of an inner container for an intermediate bulk container, wherein the closing lid provides a nozzle neck (31, 57, 72), and the container closure device for a container with a nozzle hole has a nozzle plug (33, 73) positioned on the nozzle neck, wherein the nozzle neck and the nozzle plug constitute a nozzle plug structure (30, 74) according to any one of claims 7 to 11.

16. A container with a nozzle hole, particularly an inner container for an intermediate bulk container, A container with a mouth opening having a container closure device (69) as described in claim 15.

17. An intermediate bulk container, An intermediate bulk container having a container with a mouth opening as described in claim 14 or 16, which is configured as an inner container.

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