EP3558840A1

EP3558840A1 - Pouring closure

Info

Publication number: EP3558840A1
Application number: EP17818102.0A
Authority: EP
Inventors: Günter Krautkrämer
Original assignee: Bericap Holding GmbH
Current assignee: Bericap Holding GmbH
Priority date: 2016-12-20
Filing date: 2017-12-13
Publication date: 2019-10-30
Anticipated expiration: 2037-12-13
Also published as: DE102016124947A1; PL3558840T3; US11174078B2; CN110114280A; PE20191216A1; US20190329938A1; EP3558840B1; WO2018114513A1; ES2927198T3; CN110114280B; BR112019011313A2

Abstract

The invention relates to a pouring closure for a liquid container, comprising a pour spout (10) which can be sealingly fixed to a container neck and the cross-section of which is closed by a membrane (1) prior to use. A membrane (1) part (1') which extends transversely over the membrane (1) and which is approximately pear-shaped in plan view is connected to the remaining part of the membrane via an easily tearable line of weakness (2) and can be detached from the membrane (1) so as to release a membrane (1) opening (5), which is correspondingly pear-shaped in plan view, after the detachment such that liquid can be poured selectively out of the relatively narrower section (6) or the relatively wider section (7) of the pear-shaped opening (5) according to the orientation of the container upon tilting the container. The aim of the invention is to provide a pouring closure for liquid containers of the aforementioned type, wherein the pour opening can be produced in a well-controlled and well-defined manner by detaching a membrane section, and the metered pour of the liquid is further simplified in said liquid containers. This is achieved in that the membrane (1) has webs (8) on the inner face of the membrane with a narrow spacing parallel to the line of weakness (2) and outside of the detachable section, said webs extending away from the membrane surface and inwards substantially transverse to the membrane surface and running on both sides of the narrow section (6) of the detachable part (1') or the opening (5) and along at least one part of a transition region (9) between the narrower and the wider section.

Description

pour closure

The present invention relates to a pouring closure for liquid container with a tightly fixable on a container neck spout whose cross section is closed by a membrane before putting it, extending across the membrane across, in a planar plan view in about pear-shaped part of the membrane with the rest of the part is connected via a slightly tearable line of weakness, is detachable from the membrane and a pear-shaped opening in the plan view of the membrane releases so that upon tilting of the container depending on its orientation liquid optionally from a relatively narrower portion of the pear-shaped opening or from a relatively wider of the pear-shaped opening is pourable.

The term "pear-shaped" here describes contiguous sections of a surface, wherein the sections are related to each other and wherein the smaller section has a narrow, oblong shape and the broad section has a round shape that is more approximate to a circular shape.

This definition applies, for example, to the silhouette of a pear, which consists of a relatively narrow, more or less conical or slightly bell-shaped section, which merges via a concave curvature into a more spherical end. The actual shape, in particular the width and shape of the narrow Section in relation to the wider section may also differ more from the contour of a real pear and eg take the silhouette of a mushroom or a water tower (see embodiment). In particular, the narrow section may also be bounded by two parallel sides and may be narrower over the majority of its length by a factor of 5 to 20 than the maximum width of the wide section. All these forms are summarized under the term "pear shape" even if a real pear would not reach such contours.

Ultimately, it is in this special form of the opening, which is otherwise already known from the prior art, about the fact that the flow rate when pouring liquid is much more limited only by the narrow section and thus the amount of liquid is easier to dose than when pouring through the wider section. To meter a quantity of liquid more accurately, the user turns the container so that when tilting the container with the attached spout the narrow opening portion in the membrane is down, so that the liquid exits only through this narrow section, unless the container is tilted excessively, so that the liquid level would then reach into the area of the wide opening. The tilting position with the narrow opening section turned downwards is called here "metering position".

Conversely, if a large amount of the liquid is to be poured out or the container is to be emptied completely, the container can be rotated so that when tipping the wide opening is at the bottom, so that the liquid flows out substantially through the cross section, which is much larger as the cross section of the narrow opening and moreover comes closer to a circular shape, which would reduce the flow resistance to long, narrow cross-sectional shapes even with the same cross-section.

Prior to use, however, this pear-shaped opening is closed by the membrane and the exact shape of the opening is defined by the course of a line of weakness on the otherwise circular disc-shaped membrane which completely closes the generally cylindrical cross-section of the pouring spout prior to use.

Of course, the pouring spout could also have a different cross-sectional shape than circular so that the membrane shape would also have to be adapted accordingly. For the present invention, it is ultimately only important that after tearing out a part of the membrane receives the mentioned "pear shape" of the pouring, which allows the above-described desired pouring behavior, wherein at least outside the narrow portion of the resulting opening still a part the original membrane limits the free cross-section of the pouring spout ..

Pouring closures of the type mentioned above (and thus also the pouring closures according to the invention) are often used in containers for edible oil, which sometimes has to be dosed finer depending on the application.

In this type of pouring closures, as far as they are already known, it has proved to be problematic to make the narrow portion and the wider portion of the pouring opening so that when tilting the container, the liquid actually only by the desired narrow or wider area and at the same time forms an easily manageable, evenly exiting liquid jet. Another problem with this form of pouring apertures created by severing a portion of a membrane is the stability of the line of weakness and the areas adjacent to the line of weakness. Basically, the membrane is a one-piece disc whose outer contour is usually cylindrical and at least the inner contour of the pouring spout adapted. The weakening line is introduced either during injection molding or by a one-sided scratching or impressing a corresponding contour in the surface of the disc, for example on the outside thereof. Typically, a pull-out aid, particularly a tear-out, is attached to the free end of the wider portion of the membrane member to be separated so that, for use of the closure by the user, the wider portion is first pulled out of the plane of the membrane by means of the tear ring while the membrane is along the line of weakness tears.

The term "free ends" of the narrower or the broader section designates (for the separable part of the membrane as well as for the resulting opening) the mutually facing ends of the narrow and the wide sections. broad "are not absolute but to be understood in relation to each other.

In particular, with changes in the course of the weakening line or in the region of the narrow section, however, it may happen that the membrane does not tear exactly along the line of weakness, but instead tears the membrane material next to the line of weakness, this once introduced into the membrane material crack on the other Pull on the tear ring runs completely uncontrolled, so that the result is a more or less undefined opening or tear off additional parts of the membrane and partially protrude into the opening created so that it is partially blocked again. This leads to an uncontrolled Ausgießverhalten the liquid when tilting the container, even if the user tries to align the now generated but irregular and differently than intended shaped opening in such a way that the exiting liquid quantity can be controlled and metered as accurately as possible. Furthermore, it has been found that the metering of the liquid in relatively full containers is still difficult, since often already with a slight tilting of the container with the down or tilted in the tilting direction narrow opening the liquid level very quickly the transition to the wide range reached and then at slightly exceeding the upper end of the narrow section a significantly larger amount of liquid flows through the suddenly wider opening. This is especially true for higher viscosity liquids such as edible oil, which tend to uncontrolled ventilation behavior (gurgling or jerky leakage of the liquid). For this purpose, corresponding, so-called ventilation shutters have been developed in the prior art, which reduce the outlet cross-section and have a number of smaller, adjacent to a central Ausgießquerschnitt slots through which air can flow better into the container.

Since this type of ventilation slots or openings with star-shaped extensions are typically below the area which is closed by a membrane in the pouring spout, such aeration elements would also be additionally combinable with the subject matter of the present invention.

Finally, it has been found in the conventional closures of this type that even if it succeeds only to tilt the container so far that liquid exits only through the narrow section, the exiting liquid jet is not uniform and smooth, but partially divides, a has varying cross section and / or varies.

Compared to the prior art discussed above, the present invention is therefore based on the object to provide a pouring closure for liquid container of the type mentioned, in which on the one hand the Ausgießoffnung very controlled and well defined by tearing out of a membrane section can produce and which to the other the dispensed pouring of liquid further facilitated.

This object is achieved in that the membrane has on its inside at a close distance along the line of weakness outside of the tearable portion of the membrane webs, which are away from the membrane surface inwards, d. H. towards the interior of the container, and extending either side of the narrow portion of the tearable portion of the membrane or aperture and at least along a portion of the transition region between the narrower and wider portions.

The webs, for example, in the form of strips with approximately rectangular cross-section, which can vary along its extension along the line of weakness, especially in the direction perpendicular to the membrane surface. In particular, the larger cross-sectional dimension of the webs is approximately perpendicular to the inner surface of the membrane.

The webs running parallel to the transition region and the adjacent part of the narrow section form, on the one hand, a kind of edge reinforcement of the weakening line or opening exactly where conventional closures of this type typically do an uncontrolled tearing of the membrane outside the area provided for the opening occurs. The webs prevent the membrane from tearing along the line of weakness in the direction of the part lying outside the opening. Moreover, in one embodiment, the narrow, tearable part of the membrane may also be reinforced by another ridge extending along the narrow portion and about the middle thereof, hereinafter referred to as a "ridge" for ease of distinction a small distance to the line of weakness because in the narrow portion of the line of weakness must be on both sides of the rib at a close distance to this, because the line of weakness here limits only a correspondingly narrow portion of the opening or the tearable part of the membrane.

This central rib reinforces the material of the tearable portion adjacent to the line of weakness and reinforces the narrow, tearable portion altogether, thus preventing the tear out of the tearable portion of the membrane material on the narrow portion side. The narrow section could tear off before the line of weakness is separated to the free end of the narrow section.

As a result, the ridges and the central rib ensure that the rupture of the membrane and rupture of the rupturable membrane member along the entire circumference of the opening, and in particular in the narrow part of the opening, occurs exactly along the predetermined line of weakness. The narrow opening produced thereby is thus reliably and precisely defined, and this incidentally also applies to the broad part of the opening, in which, however, small deviations from the exact contour of the weakening line are less critical because the wide opening does not have to allow fine dosing.

With respect to the distances to the line of weakness applies to the reinforcing rib substantially the same as for the webs, this distance is ultimately determined by the width of the detachable part and the width of the rib and wherein in the event that the narrow portion deliberately a larger width of eg 10 mm or more, the reinforcing rib could also be arranged in the form of two parallel ribs along the lines of weakness on the detachable part.

However, a difference between the reinforcing ribs, which reinforce the detachable, narrow part of the membrane, to the webs outside of the narrow section consists mainly in the height of the webs or reinforcing ribs. While for the pure amplification function, for example, a doubling or a maximum tripling of the wall thickness of the membrane is sufficient, the webs on the inside of the membrane, which extend along the narrow section extend the separable part and in the transition region or along the resulting opening, another function by influencing the pouring behavior of the liquid. For this reason, the maximum height of the webs, measured perpendicular to the membrane surface, is between 2 and 10 mm or, more generally, more than 10% for pouring caps of different dimensions and up to 50% of the inside diameter of the pouring spout, in the case of non-cylindrical spouts here Mean value of the inner diameter would be used as a standard. The minimum height of the webs at their outer ends may be zero, although it is preferred that the webs near the free end of the narrow section already on the wall or in the immediate vicinity (for example, a maximum of 2 mm distance, preferably maximum 1 mm) to the wall of the spout and have an initial height of at least 1 mm, preferably 2 mm.

The maximum height of the ridge is preferably in the vicinity of the transition region from the narrow to the wider portion of the opening or the detachable part of the membrane. The transition region of the pear shape is defined here for example by a concave portion of the outer contour. While the narrow section is essentially convexly curved at its end and otherwise defined, for example, by straight and in particular parallel contour lines, at some point the transition to a wider area must take place, which then necessarily has a concave contour.

As far as this concave contour can be clearly determined, also the transition region is defined and defined by this concave section. For opening contours, for which such a concave transition region is not clearly detectable and in particular is not limited to an area that makes up less than 20% of the diameter of the spout (measured between the opposite free ends of the wide and narrow sections), the transition region is a Defined area whose boundaries are at 45% and 55% of the diameter between the free ends of the narrow and wide sections. In any case, the opening widened in the region of the transition section either in a concave shape or in the form of two diverging legs and in this area the webs have their maximum height, in the case of a spout with 20 mm diameter, for example, 5 mm or 6 mm.

If the narrow opening is then directed downwards when the container is tilted, with the liquid level gradually increasing with increasing tilt angle from the lower edge of the narrow opening to the upper edge, the liquid will initially flow out exclusively through the narrow section of the opening and at one greater tilting, when the liquid level reaches the end of the narrow section, the liquid is prevented by the webs from passing beyond the narrow opening and immediately into the adjacent area the wider opening to flow and thus suddenly leak in greater quantities from the spout.

The webs extending along the transition region and up to or in the wider area, rather divert the liquid to the outside or hold back and would only at an even higher tilt angle, a spill of liquid over its upper edge and then over allow the wider section.

These webs are also referred to as "deflectors" because of this flow deflection and blockage.

However, their maximum height need not already have the webs near the lower end of the narrow opening, so that in one embodiment the web height is provided from the beginning of the web near the first end of the narrow section (that of the wide section is removed) increases with approach to the transition region and preferably at least doubled up to a maximum web height. The ridge height could thus be close to the lower end of the narrow opening, e.g. 2 mm and near the transition region e.g. 5 mm, and then in the further course, when the bridge still extends well into the area of the wider section, it may decrease again. Preferably, however, the lands along the wide area terminate at a distance in front of the outer edge of the membrane, whereas the wider opening closely approximates the outer edge of the membrane or the inner wall of the spout and, for example, at the opposite end of the wide opening from the narrow portion less than 2 mm, preferably less than 1 mm. In this area, only remnants of the membrane remain due to the fact that the weakening line in this area can not be flush with the membrane.

Although it is not absolutely necessary for the webs along the narrow section to begin near the free end of this section and thus at or near the edge of the membrane, it has been found that the outflow behavior of the liquid (in particular special edible oil) in all, especially at small tilt angles of the container is particularly uniform when the webs start at a distance of less than 3 mm, preferably less than 2 mm from the outer edge of the membrane, with the free end of the narrow portion at a distance of not more than 1 mm from the edge of the membrane. The distance between the webs of the weakening line along the narrow portion and preferably also along the transition region is a maximum of 10% of the membrane diameter, in particular a maximum of 3 mm and preferably a maximum of 2 mm. The pear-shaped opening, ie the entire pouring opening consisting of the narrow section and the wide section, extends approximately over the entire diameter of the membrane with their ends remote from one another and preferably also encompasses the geometric center of the membrane, with slight displacements or displacements with respect to the membrane center fall into the ..

The narrow portion extends from its first end near the wall of the spout to the center of the membrane, and preferably slightly beyond, and is preferably defined by two parallel lateral edges having a clearance of 1 to 3 mm.

The wide opening has a maximum width, which in one embodiment is at least one-third, preferably more than half, of the membrane diameter, with the wide opening extending radially to the narrow portion over slightly less than half the membrane diameter. In any event, in some embodiments, the length and width of the narrow portion and the length and width of the wide portion are selected such that the cross-section of the narrow portion is less than one third of the cross section of the wide portion. The cross-sectional area of the wide portion is preferably at least one-fifth relative to the total membrane area.

Conveniently, one of the two free ends of the detachable part of the membrane, so either the free end of the narrow portion or facing away from this end of the wide portion is provided with a tear-out, which is preferably designed as a tear-out.

Further advantages, features and possible applications of the present invention will become apparent from the following description of a preferred embodiment and the associated figures. FIG. 1 shows a top view of a pouring closure from inside or below,

FIG. 2 shows a side view of the closure,

FIG. 3 is a top view of the closure of FIG. 1 with the tear ring omitted;

FIG. 4 shows a sectional view along the line BB in FIG. 1,

FIG. 5 shows a perspective view of the pouring closure from below,

FIG. 6 shows a top view of a closed membrane from below,

Figure 7 is a plan view of an open membrane from below. In Figures 1 to 5 can be seen a closure 100 which is latched onto a cylindrical neck of a container and having an outer, a container neck from the outside embracing closure shell 20 and an inner spout 10, the lower portion with the inside of a container neck in sealing Intervention occurs. The transition between the lower and the upper portion 10 'of the spout 10 is closed by a membrane 1 extending over the cross section of the spout 10. The closure also has a surrounding the upper portion of the spout 10 threaded extension 30, which serves for closing by means of a screw cap, not shown. In the plan view from above in accordance with FIG. 3, a membrane 1 with an approximately pear-shaped, central and detachable section 1 ', which is framed by a bold line of weakness 2, can be seen within the pouring spout 10. The weakening line 2 is introduced from the outside into the surface of the membrane 1 (incised or pressed) and is therefore not visible in a view from below (FIG. 1).

In the perspective view from below according to FIG. 5, it can be seen that two curved webs 8 run on the inside of the membrane on the right and left, which, without being recognizable in FIG. 5, follow approximately the course of the weakening line 2, namely, As can be seen in FIGS. 6 and 7, especially along the narrow portion of the separable part 1 ', over a transition region 9 and extending into the lower half of the wide portion of the tearable part V of the membrane 1.

The transition region is here defined by that portion of the line of weakness between the narrow and the wider portion of the detachable part V, which is characterized by your concave curvature of the weakening line 2, which otherwise has a substantially convex course.

In addition, FIG. 5 also shows a central rib 11 which extends diametrically over the inside of the membrane and primarily serves to reinforce the narrow section of the separable part 1 '. The height of the rib 1 1 increases along the narrow portion of the part 1 'to the free end of this narrow section towards. (Figure 4)

In the sectional view according to Figure 4 can be seen also that the webs 8 in the side view from a point near the free end of the narrow portion of the detachable part V of the diaphragm 1 have a relatively small web height, which then increases approximately linearly to a maximum value and to the other, away from the plane of Figure 4 curved away towards the end again. The maximum height of the webs 8 lies in the region which is closest to the transition region 9 of the weakening line. The perspective view in FIG 5 reveals the shape and the course of the webs 8 relatively well. In this area, the webs in the plan view similar to the line of weakness 2 also have a concave curvature.

The free end of the wide portion of the detachable part V of the membrane is connected to a tear ring 12, so that when pulling on the tear ring 12 first the free end of the wide portion of the detachable part V along the line of weakness 2 is detached from the membrane 1 and torn off, whereupon, on further pulling on the tear ring 12, the connection between the detachable part V and the remaining part of the membrane 1 along the weakening line 2 is separated. Finally, over the transition region 9, the narrow portion of the detachable part 1 'is also covered by the tensile force applied to the tear ring so that the entire detachable part 1' of the membrane can be separated and removed along the line of weakness (see FIG. 6).

In the transition region 9 and along the narrow portion, the webs 8 and the central rib 11, which form a reinforcement of the membrane material on both sides of the line of weakness 2, ensure that the membrane does not tear on either side of the line of weakness 2 and the edge of the resulting opening would then run unchecked. The reinforcements by the webs 8 and the rib 1 1 thus ensure that the detachable part V of the membrane 1 tears off exactly along the predetermined weakening line 2 in the transition region 9 and in the narrow region and then leaves an opening 5 which is exactly the same by the weakening line predetermined shape of the detachable part V corresponds.

The resulting opening is denoted as a whole by 5, the narrow part of the opening 5 by 6 and the broad part of the opening 5 by 7 (see FIG. 7).

The reinforcing rib 11 is removed together with the detachable part 1 'of the membrane, so that ultimately a membrane 1 with said opening 5 and the webs 8 remains, which is mainly along the narrow portion 6 of the opening along the transition region 9 and along the edge extend the wide opening in a section adjoining the transition region to a certain distance in front of the circumference of the membrane.

It can also be seen from FIG. 7 that the webs 8 in the region of the narrow opening 6 and also in the transition region 9 follow the edge of the narrow opening 6 or the weakening line 2 at a relatively close distance in parallel. The ends of the webs 8, which continue to diverge beyond the transition region, can then have an increasingly greater distance from the edge of the wide section 7 of the opening 5. Based on the perspective view of the webs 8 in Figure 5 and also in view of the contour of the webs as shown in Figure 4 it can be seen that after tilting a container with the pouring in the metering position, the liquid during flow against the inner surface of the membrane the now generated opening 5 initially only between the parallel legs of the webs 8 through to the corresponding narrow opening 6 and can flow through it.

When the liquid level rises due to an increase in the tilt angle, the webs, which become increasingly higher towards the transition region, prevent the liquid from laterally also flowing in the direction of the wider opening 7 and through it. As a result, it is achieved that the tilt angle of the container can vary within a relatively wide range without the liquid overcoming the obstacle of the webs 8. The liquid is directed by the webs 8 to the outside in an area that comes to rest only at a larger tilt angle below the liquid level. The webs are therefore also referred to here as "deflectors." The liquid can still escape through the full Ouerschnitt of the narrow area, but without appreciable additional amounts of liquid can flow through the wider portion 7 of the opening 5. Auf In this way it is ensured that the metering position with respect to closures which have no such webs, allows a much larger tilt angle range and thus considerably facilitates the metering of liquid.

If the closure or the container is rotated so that when tilting the container, the wide opening 7 below (below or in the range of the liquid level), so this wide opening 7 is completely freely accessible to the inflowing liquid and the webs 8 then make practical no appreciable flow obstacle, since they now turn the inflowing liquid inward in the direction of the wide opening 7, wherein the narrow opening 6 then acts as a ventilation opening

At the same time, the webs 8 also serve as reinforcing elements in tearing out the detachable part V of the membrane and thus ensure that a well-defined, desired shape of the pouring opening with the sections 6 and 7 is produced. reference numeral

1 membrane

r detachable section

2 weakening line

5 opening (total)

6 narrow part of the opening

7 wide part of the opening

8 footbridge

9 transition area

10 spout

11 rib

12 tear ring

20 sealing jacket

30 thread approach

100 closure

Claims

P a n t a n s p r e c h e

Pouring closure for liquid containers, with a pouring spout (10) which can be tightly sealed on a container neck and whose cross-section is closed by a membrane (1) before being put into use, whereby a part (pear-shaped) extending across the membrane (1) is formed. 1 ') of the membrane (1) with the remaining part via a slightly tearable weakening line (2) and is detachable from the membrane (1), so that he after separating a corresponding pear-shaped in plan view opening (5) of the membrane ( 1), so that upon tilting of the container, depending on its orientation, liquid is pourable either from a relatively narrower section (6) or from a relatively wider section (7) of the pear-shaped opening (5), characterized in that the Make up the membrane (1) on its inside at a small distance next to the weakening line (2) and outside the tear-out section (8) which extends inwardly away from the membrane surface and which is located on either side of the narrow portion (6) of the tearable member (1 ') and the opening (5) and along at least part of a transitional region (9) between the narrower and wider section.

Pouring closure according to claim 1, characterized in that the measured perpendicular to the membrane surface maximum height of the webs between 2 and 10 mm and in particular more than 10% and up to 50% of the inner diameter of the spout.

Pouring closure according to claim 1 or 2, characterized in that the web height increases from the beginning of the web (8) near its first end of the narrow portion (6) remote from the wide portion (7) as it approaches the transition region (9) preferably at least doubled up to a maximum web height.

Pouring cap according to one of the preceding claims, characterized in that the web height decreases from a maximum height in the transition region to the second end adjacent to the wider portion (7) by at least 50%.

Pouring closure according to one of the preceding claims, characterized in that the minimum height of the webs (8) near the free end of the narrow portion (6) of the opening is 1 mm, preferably 2 mm.

Pouring closure according to one of the preceding claims, characterized in that the webs extend beyond the transition region, but terminate at a distance from the outer edge of the membrane. Pouring closure according to one of the preceding claims, characterized in that the distance between the webs of the weakening line (2) along the narrow portion and preferably also along the transition region (9) is at most 10% of the membrane diameter, in particular at most 3mm, preferably at most 2 mm.

Pouring cap according to one of the preceding claims, characterized in that the narrow portion of the tearable part (1 ') of the membrane (1) has a reinforcing rib (11) extending parallel to the two edges of the narrow portion, preferably on the inside the membrane (1) extends.

Pouring cap according to one of the preceding claims, characterized in that the pear-shaped opening (5) extends with its mutually applied free ends of the narrow (6) and the wide portion (7) approximately over the entire diameter of the membrane and preferably also the geometric center the membrane comprises.

Pouring cap according to one of the preceding claims, characterized in that the narrow portion has a maximum width which is less than a quarter, in particular less than 15% of the membrane diameter and the wide portion has a maximum width more than a third, in particular more half of the membrane diameter is.

Pouring cap according to one of the preceding claims, characterized in that the edge of the pear-shaped opening (5) in the narrow (6) and in the wide portion (7) has a substantially convex shape or is rectilinear, wherein the transition region (9) between the narrow and the wide section is defined by having a concave course.

A spout according to any one of the preceding claims, characterized in that the transition region is defined by the section between 45% and 55% of the distance between the opposite free ends of the narrow and wide sections.

Pouring cap according to one of the preceding claims, characterized in that the narrow portion extends approximately from the edge to the center of the membrane.

4. Pouring spout according to one of the preceding claims, characterized in that the cross section of the narrow portion is less than one third of the cross section of the wide portion.

5. Pouring spout according to one of the preceding claims, characterized in that the cross-sectional area of the wide portion is at least one sixth, preferably at least a quarter of the total membrane area.

6. Pouring spout according to one of the preceding claims, characterized in that the end of the wide portion is provided with a tear-off, which is preferably designed as a tear ring