RU2437810C2 - Plastic sealing device equipped with cutting ring - Google Patents

Abstract

FIELD: packing industry. ^ SUBSTANCE: sealing device from plastic comprises an outlet part for fixation on a package, a screw cap wound onto the outlet part and an opening ring made with the possibility of displacement in the outlet part along the helical line down to the package for package opening. At the same time the screw cover is equipped with at least one grip made with the possibility of affecting at least one thrust element of the opening ring so that during initial opening of the helical cover the opening ring moves inside the outlet part into the lower position in direction towards the package for its opening, and during subsequent closure of the outlet part with the helical over the opening ring remains in the lower position. The opening ring is equipped with at least two protruding down cutting and/or piercing elements, which are arranged on the circumferential periphery of the opening ring and form its lower edge. At the same time cutting and/or piercing elements are arranged substantially in the form of a rectangle. Besides, the longitudinal edge that protrudes down distorts the shape of the rectangle and forms a triangle that protrudes down, so that it forms a spike that protrudes down. Besides, the longitudinal edge has a lowering section in the front relative to direction of the opening ring rotation, and then a raising section. At the same time the raising section is made as longer and more sloping compared to the lowering section. ^ EFFECT: development of a sealing device, which may be made with low costs, and which also provides for efficient opening of various packages, also when it is not perfectly aligned above the loosened area of the package. ^ 15 cl, 13 dwg

Description

Technical field

The present invention relates to a plastic closure equipped with a cutting ring, in accordance with the restrictive part of claim 1. The closure is particularly suitable for sealed packages containing flowable contents, preferably a beverage.

State of the art

A closure of this type is known from patent document EP 1088764. This closure consists of three parts, namely a screw cap, a lower part and a cutting ring. The lower part is made tubular and has a circumferential flange on its lower side, with which it can be attached to the packaging of the drink. The tubular part forms an outlet tip that can be closed with a screw cap. The cutting ring is also tubular and has a cutting tooth at its lower end. In the unopened state of the package, the cutting ring is inside the bottom, and the screw cap is screwed onto the bottom. When the screw cap is rotated to open the closure, the cutting ring also rotates due to the gripping system, which simultaneously moves downward along the axis. Due to this, the packaging is cut in a circle, in particular the packaging film along the place of proper opening. After a predetermined angle of rotation, that is, when the package is opened wide enough, the gripping interaction between the screw cap and the cutting ring is terminated. Subsequently, the screw cap can be completely removed from the outlet tip and, after consuming the contents, is put on again without moving the cutting ring protruding inside the package. The cutting ring and the lower part are molded as a whole as part of a single structural combination in which they are held coaxially to each other by connecting bridges. These bridges extend between the upper edge of the cutting ring and the lower side of the lower part. These bridges break when the cutting ring is pushed into the lower part for the first time.

The shape and design of such closures is theoretically unlimited. However, in practice, they must be amenable to injection molding. In addition, they should be manufactured as economically as possible.

Various types of packages are known that can be opened using such self-opening closures. Among the known packages are, for example, combination packages containing a layer of paper or cardboard laminated with one or more layers of thin plastic and / or metal. A typical combination package contains, for example, a cardboard layer, which on the inside of the package is provided with a thin layer of aluminum, in turn equipped with a layer of polyethylene. Recently, packaging is increasingly being used that no longer has a cardboard layer, but is formed by a relatively thick plastic film, in particular a film of pure polyethylene, if necessary with one or more very thin barrier layers.

In the manufacture of the package, usually in the place where the closure device will later be installed, the package is loosened, for example pre-punched to allow easier penetration of the cutting ring into the wall of the package. Moreover, depending on the design of the package and the manufacturing method, there are various possibilities. For packaging of pure polyethylene in the packaging wall, for example, a circular line of slack with a smaller wall thickness can be made. In a combined package, as a rule, the weakened area is performed by the fact that the cardboard layer is possibly pre-cut (for example, punched) completely in a circular area. When this pre-punching is done before the cardboard is coated with other layers, the circular disk cut in the cardboard is usually removed before the other layers are coated. This results in a package that in the area of the future opening has a round section of only thin layers of aluminum and / or plastic, but in which there is no cardboard at all. If, in contrast, the cardboard layer is perforated after coating, the cut cardboard disk remains connected to the film layers.

For each type of these different packages, a different type of opening ring is usually used. So, for example, for packaging, which in the region of the hole has a round section of only film layers, an opening ring is not suitable, which transfers high axial force (pressure) to the film layers. In this case, there is a tendency for the film layers to deviate from this force by the fact that they bulge inside the package. Instead, such packages should be opened by cutting as far as possible. And vice versa, for packages with a cardboard disk still available on them, it is better to apply mainly a pressure force.

In addition, the known self-opening closures require very precise positioning of the closure in the area provided and pre-prepared by loosening the opening. If such closures are not precisely centered during positioning, careful opening of the packaging is often not provided.

From patent document WO 03/002419 a closure device with an opening ring is known, comprising two cutting elements that are arranged along one another and have a basic triangular shape.

Patent document WO 2006/089440 also shows an opening ring with two triangular cutting elements.

The patent document WO 2004/083055 also describes triangular cutting elements. Additionally, a tooth for perforation is provided here. In the case when the film of the laminated packaging material is not cut by purely cutting teeth, it is punched by a perforating tooth.

Patent Document WO 2007/030965 describes an opening ring with three teeth. Each of these teeth has a triangular base shape, which is adjacent to the reinforcing ledge. In two teeth, this ledge is made behind the tooth in the direction of its rotation, and on the third tooth it precedes the tooth.

Each of these opening rings is optimal for a particular type of packaging. Therefore, none of them gives positive results for all the above types of packaging, but is unsuitable for at least one type of packaging.

Disclosure of invention

Accordingly, an object of the invention is to provide a closure device of the indicated type, which can be manufactured at low cost. Another object of the invention is to provide a closure device suitable for effectively opening various types of packaging of various designs or various prefabrication technologies. Another object of the invention is to provide a closure device capable of satisfactorily opening various types of packages even when it is not perfectly centered over the weakened area of the package.

In accordance with the invention, the solution of the tasks is provided in a capping device having the characteristics of paragraph 1 of the claims.

The plastic closure device includes an outlet for mounting on the package, a screw cap screwed onto the outlet, and an opening ring configured to move downward through the helix in the outlet to the package to open the package. The screw cap is provided with at least one driving element or grip that acts on at least one thrust element of the opening ring and acts so that when the screw cover is first opened, the opening ring moves to the lower position inside the outlet towards the packaging to open it . When the exhaust part is subsequently closed with a screw cap, the opening ring remains in its lower position. The opening ring is provided with at least two cutting and / or piercing elements protruding downward, which are located on the circumferential periphery of the opening ring and form its lower edge. These cutting and / or punching elements are essentially quadrangular. A relatively long downwardly projecting longitudinal edge disrupts the shape of the rectangle and forms a downwardly projecting triangle, so that a downwardly projecting tip is formed. The longitudinal edge has a descending section in relation to the direction of rotation of the opening ring in front, and then a ascending section, while the ascending section is made longer and gently sloping than the descending section, and passes obliquely at a gentle angle to a plane perpendicular to the longitudinal axis.

This shaping of cutting and / or punching elements is the result of optimization to satisfy fundamentally conflicting requirements. It turned out that due to the proposed form, a particularly reliable and clean opening of the package is achieved, equally reliable for various types of packaging (especially laminated cardboard packaging with various types of weakening, as well as film polyethylene packaging). Moreover, the front section of the longitudinal edge when turning the opening ring acts as a cutting, and the entire longitudinal edge, including its rear section, additionally has a pushing effect when moving down.

The ascending and / or descending section may extend straight or curved. Preferably, the ascending portion is significantly longer than the descending portion and preferably has a length of at least 2.5 times the length of the descending portion. Preferably, the descending portion forms an angle of at least 40 °, particularly preferably 50 °, with a horizontal (i.e., with a plane perpendicular to the axis of rotation), while the angle between the rising portion and the horizontal is preferably less than 30 °, particularly preferably less 20 °. Preferably, an obtuse angle is formed between the descending and ascending portions of the longitudinal edge, that is, an angle greater than 90 °.

Preferably, the downwardly extending longitudinal edge forms a cutting edge at least in its descending portion, that is, the opening ring is made in this region tapering to the longitudinal edge, like a knife. Due to this, the cutting of the package is facilitated. Preferably, the rising portion also forms a cutting edge. Due to this, it is also possible to effectively separate, for example, film material, which flexibly stretches the longitudinal edge.

Preferably, the cutting edge is formed on the inner circumferential surface of the opening ring. In other words, the opening ring preferably tapers toward the longitudinal edge only on the outer circumferential surface to form a cutting edge, while the inner circumferential surface remains unchanged in the region of the longitudinal edge. Due to this, the cut material is squeezed out, which provides a cleaner contour of the cut disk of the packaging material.

Preferably, all cutting and / or punching elements protrude downward at the same distance. At the same time, they simultaneously come into contact with the weakened region of the package and pierce it in several places at once. Even in the absence of perforation, easy opening is provided at this location. In addition, a relatively higher and uniform pressure is exerted on the weakened region, which is especially advantageous for certain types of packages.

In order to achieve a uniform distribution of forces, the cutting and / or punching elements are preferably arranged uniformly spaced on the circumferential periphery.

Additionally, the opening ring may contain at least one clamping element, which together with the cutting and / or punching elements forms the lower edge and serves to squeeze down the separated disc of the packaging material, which prevents the release of contents. If present, the clamping element is located in the direction of rotation of the cutting and / or punching elements behind them.

In this case, it is preferable that first the cutting and / or punching elements are arranged one after the other uniformly spaced around the circumferential periphery, and the distance from the pressing element to the first cutting and / or punching element in the direction of rotation is preferably greater than the distance between these cutting and / or punching elements.

In the presence of a clamping element, the opening ring preferably contains from three to five, in particular four cutting and / or piercing elements. Without a pressing element, it is preferable if the opening ring contains from four to six, in particular five cutting and / or punching elements. With a smaller number, the distribution of forces is less uniform and the strength of the material of each individual cutting and / or punching element should increase significantly, which makes manufacturing more expensive. On the other hand, a greater number of such elements leads to the fact that each individual element is smaller, which is unfavorable in terms of stability. In addition, if there are too many elements, the pressure exerted by each element is too small to obtain a clean cutting effect. The optimum number is the result of continuous optimization with respect to the various and partially contradictory requirements that the opening ring must satisfy in order to be suitable for different types of packages.

For directional purposes, the opening ring is preferably provided with an external thread that engages with the internal thread of the outlet portion, so that the opening ring rotates as it moves downward. The lifting height or the stroke of the external thread is preferably chosen such that when the screw cap is unscrewed, the opening ring rotates less than 360 °, in particular 300 °.

Preferably, only one single grip is provided on the screw cap. Preferably, accordingly, only one thrust element is also provided on the opening ring. Preferably, this thrust member is located in the region of the front cutting and / or punching member in the direction of rotation of the ring. However, several thrust elements distributed over the circumferential periphery may also be provided, while the gripping engages with only one of them.

With a single drive element or gripper, the closure has a very simple design. This minimizes manufacturing costs. In particular, there is material savings because the gripper system is kept to an absolute minimum. Thanks to the simple form of the closure, its manufacture is simplified, and the rejection of closures is relatively low in quality.

Preferably, the gripper has a gripping edge that extends axially. In this case, the gripping edge preferably has an abutment surface inclined to the radial direction. The grip can be made, in particular, in the form of a tooth with a vertically extending gripping edge and a rear side with an inclination angle of max. 45 °. Preferably, the grip has a height approximately corresponding to the height of the outlet. The thrust element may be a protrusion that extends from the inner wall of the opening ring and has an edge extending in the axial direction only at a part of the height of the opening ring. In this case, the protrusion may have a cut relative to the radial direction.

Other preferred embodiments will be apparent from the dependent claims.

Brief List of Drawings

Next, with reference to the accompanying drawings will be described in detail examples of the invention. In the drawings:

figure 1 depicts in longitudinal section a capping device in the first exemplary embodiment in a state before first use,

figure 2 depicts the device of figure 1 with the screw cap unscrewed,

figure 3 depicts the device of figure 2 in side view,

figure 4 depicts a bottom view of the capping device of figure 2, mounted on the package,

figure 5 depicts a longitudinal section of the exhaust part and the opening ring of the device of figure 1 in the state after manufacture,

6 depicts the device of figure 1 in a perspective view from below,

Fig.7 depicts the device of Fig.1 in a perspective view from the side,

Fig.8 depicts the device of Fig.1 in a bottom view,

Fig.9 depicts the exhaust part and the opening ring of Fig.1 in a side view,

figure 10 depicts a view in section aa in figure 9,

11 depicts in longitudinal section a capping device according to the invention in a second embodiment,

Fig.12 depicts the closure of Fig.11 in a perspective view, and

Fig.13 depicts a bottom view of the capping device of Fig.11, mounted on the package.

The implementation of the invention

Figures 1-10 show an embodiment of a closure device or self-opening closure device. Such closures are installed on packages with flowable contents, in particular on beverage packages made of cardboard with an inner film. Preferably in this area, the package has a predefined, but still hermetically sealed outlet. Preferably, the cardboard is already perforated or loosened in another way, however, the film underneath is still intact.

The device is made of plastic by injection molding, and its individual parts can be made of the same or of different plastics.

As can be seen in FIG. 1, the device consists essentially of a discharge part 1, a screw cap 2 and an opening ring 3. Preferably, there is additionally a guarantee protective strip 4, which is preferably made integrally with the screw cap 2. The discharge part 1 and the opening ring 3 are preferably also made together as a unit. However, their separate manufacture is also possible.

The outlet portion 1 consists essentially of a cylindrical outlet tip 10 with a through outlet and a flange 13 protruding outward from the outlet tip 10 formed at the lower end of the outlet tip 10. This flange 13 is welded or otherwise attached to the package so that the outlet tip 10 adjoins it over a predefined outlet.

The outlet tip 10 is provided with an external thread 12 and an internal thread 14. In the lower region of the outlet tip 10 above the flange 13 there are ribs 15 with retaining tips 15 ', as will be described later.

The screw cap 2 preferably has a cylindrical circumferential wall 21 and an approximately flat upper overlap 20. Using an internal thread 22, the cap 2 can be screwed onto the external thread 12 of the outlet portion 1. The outer wall 21 is connected to the protective strip 4 by means of rupture jumpers 23.

In the upper inner region of the screw cap 2, a circumferential sealing flange 26, which in the closed state of the cap 2 is elastically adjacent to the inside of the outlet tip 10, protrudes downwardly.

The lid 2 is provided with a single jaw 24 protruding inward or downward, which is preferably molded on the inner side of the upper floor 20. Preferably, the jaw 24 has a generally triangular shape and is curved on the circumferential surface with a concentric internal thread 14. The gripping edge of the thread 14 extends axially direction, and it preferably has a thrust surface inclined toward the radial direction, so that it forms a rear grip. The rear side is adjacent to the leading edge in the direction of rotation of the cover 2 when opened, and the rear side has an inclination angle of at most 45 °. The height of the grip 24 approximately corresponds to the height of the outlet part 1, in particular the height of the outlet tip 10.

The opening ring 3 is made in the form of a hollow cylinder with a through passage. It mainly consists of a ring 30 with an external thread 31 and cutting and / or punching elements 32a-32e, protruding downward approximately vertically. These cutting and / or punching elements 32a-32e are distributed on the circumferential periphery of the opening ring 3 and are located at a distance 33 from each other, forming a lower edge. In addition, at least one pressure member 35 can be further provided on this edge (FIG. 11). These elements will be further described in more detail.

The opening ring 3 is provided with at least one, and preferably only one, stop element 36, as can be seen in FIG. The abutment element 36 is a protrusion extending from the inner wall of the opening ring 3, which has an axially extending edge and preferably occupies only a part of the height of the opening ring 3. Preferably, the protrusion comprises a abutment surface inclined with respect to the radial direction. This protrusion preferably extends in the region of the external thread 31, the external thread 31 having a height greater than the height of the protrusion. Preferably, the abutment element 36 is located in the direction of rotation of the opening ring 3 in the region of the first cutting and / or punching element 32a, and it can be located in the front or in the rear region of this element or between them.

In the position of figure 1, the cover 2 is screwed onto the outlet part 1, and the opening ring 3 is located in the outlet tip 10, and it does not protrude down the tip or flange 13. The protective strip 4 is intact. This situation corresponds to the situation before the first use of the closure, and in this position, the closure is mounted on the package.

Further, when unscrewing the cover 2, the gripper 24 abuts against the stop element 36, as shown in Fig.6. In the case when their surfaces are made inclined, at least partial geometric closure is created, which enhances the connection between the cover 2 and the opening ring 3.

The external thread 31 of the ring 3 engages with the internal thread 14 of the exhaust part 1, so that when the cover 2 is first unscrewed, the opening ring 3 rotates along a helical line and moves downward inside the exhaust tip 10. When the cover 2 is removed, the mutual stop between the catch 24 and the stop element 36 ceases.

In the position of FIG. 2, the lid 2 is removed, the rupture bridges 23 to the protective strip are torn, and the opening ring has moved down, so that now it is held only by its upper part in the lower region of the outlet tip 10, but protrudes with its teeth 32a-32e down behind the flange 13. This situation corresponds to the situation at the first opening of the closure device.

4, this usage position is further illustrated, and it can be seen that the packaging portion D, which previously determines the outlet of the packaging K, is not completely separated, but remains connected to it in a small portion of the circle. However, this packaging portion D is held in a tilted position by at least one of the cutting and / or punching elements 32e.

Now, the opening ring 3 remains in this lower position even when the cover 2 is put on and tightly screwed.

As can be seen in FIG. 3, in this embodiment, there are a total of five cutting and / or punching elements 32a-32e. Preferably they are made equal in height. These elements are evenly spaced around the circumferential periphery of the ring 3.

Preferably, the elements 32a-32e are molded identical in shape and size. They have a substantially rectangular shape, with one longitudinally projecting downward edge violating the rectangular shape. It is made oblique, and the height of the element decreases backward in the direction of rotation of the opening ring 3. The longitudinal edge has a relatively large length, greater than the distances 33 between the elements. Preferably, these edges have a length of at least twice the length of the intermediate distances 33.

In this embodiment, the longitudinal edge is relatively obtuse, so that the elements act more likely or exclusively as punching or punching, and not as cutting elements.

However, as shown in figures 11-13, these elements can be made in the form of cutting elements without the need for a significant change in their basic shape. In this other preferred embodiment, a longitudinal edge is formed instead of the straight-running longitudinal edge of FIG. 3, which first goes down in the direction of rotation of the ring 3 and then rises, so that a downwardly protruding point is formed. In this case, the ascending portion is made longer and gently sloping than the descending portion serving as a cutting edge. In this embodiment, the length of the ascending portion is approximately three times the length of the descending portion. The descending section has an angle of inclination to the horizontal equal to about 50 ° (i.e., the angle of inclination to a plane perpendicular to the axis of rotation), while the ascending section forms an angle with the horizontal equal to only about 12 °. An obtuse angle is formed between the ascending portion and the descending portion, which in this case is approximately 118 °. Both the descending section and the ascending section are made in the form of cutting edges by the type of knives. To do this, the opening ring narrows to the cutting edge or passes with a knife edge to the cutting edge. In this case, this narrowing takes place only on the outside of the opening ring. Unlike the outside, the inner circumferential surface of the opening ring has a cylindrical shape in the region of the cutting edge. Due to this, when cutting material, the cutting edge extrudes the cut material to the outside, which provides a cleaner contour of the slot.

In the embodiment of FIGS. 11-13, there are a total of four cutting and / or punching elements 32a-32d, followed by a single clamping element 35. All cutting elements 32 are made of the same size and shape. The pressure member 35 is approximately the same in width or length, however, it does not have a cutting tip and therefore is smaller in height. The distance from the pressing element 35 to the first in the direction of rotation of the cutting and / or punching element 32 is greater than the distance between these cutting and / or punching elements.

The advantage of these two embodiments is that they no longer have to be mounted exactly above the predefined outlet. Due to their relatively long or wide cutting and / or punching elements in the direction of rotation of the ring 3, these devices can be brought into contact with the section away from the perforation and exert sufficient pressure to separate the section D of the package K. In addition, thanks to these elements, between the ring 3 and a thread with respect to a steep stroke can be selected with the outlet tip 10, so that a rotation of less than 360 °, in particular 300 °, is sufficient to open the package and retract the portion D of the package.

Figure 5 shows the feasibility of manufacturing such a closure device. The cover is molded separately, and the ring 3 and the exhaust part 2 are made as a whole. In this case, the ring 3 partially protrudes upward from the outlet part 2 and is connected to it by the connecting ribs 5. After molding, the ring 3 is completely pressed into the outlet tip 10, and the connecting ribs 5 are broken.

7-10 shows a preferred embodiment illustrating an indication of a primary opening. This type of indication is suitable not only for this closure device, but for all closure devices containing an outlet tip with a flange and a cap screwed onto it.

On the upper side of the flange 13 several ribs 15 are formed which extend tangentially to the outlet tip 10 and parallel to each other, as shown in FIG. 10. Their free ends preferably lie on a common circle, concentric on the outer circumferential surface of the outlet tip 10. One or more ribs 15, in this case two, can extend perpendicular to the rest of the ribs. The free ends of the ribs 15 form holding tips 15 ', as can be seen in Fig.9.

As shown in FIG. 7, a protective strip 4 is formed on the lid 2, which is connected to it by rupture bridges 23 and preferably completely surrounds the lid 2. As can be seen in FIG. 10, in the unopened state of the closure, the retaining ribs 40 of the protective strip 4 engage holding tips 15 'and prevent the relative rotation of the cover 2 and the exhaust part 2. When the cover 2 is rotated, the bursting bridges 23 are torn apart by axial tension and the protective strip 4 is completely separated from the cover 2.

Preferably, there are also connecting bridges 6 between the cover 2 and the protective strip 4, preferably wider than the rupture bridges 23. In the illustrated embodiment, there are three such bridges 6, however their number may be different. These bridges facilitate and accelerate injection molding, since relatively much material can be transferred through these bridges. After making the lid and preferably before installing the closure, these bridges 6 are destroyed. Preferably they are cut with a knife or laser. Such connecting bridges can be used in all embodiments. In addition, they can be used in the joint molding of any individual parts. This manufacturing method is not limited to the described closures of the invention.

Other forms of the opening ring 3 are possible, in particular cutting and / or piercing elements. The number of teeth can also be different. In addition, the above-mentioned external and internal threads can be through or only partial along the length of the elements.

List of items

1 Outlet

10 outlet tip

12 External thread

13 Flange

14 Internal thread

15 rib

15 'holding tip

2 screw cap

20 Top floor

21 Circumference

22 Internal thread

23 Bursting jumpers

24 Capture

26 Sealing flange

3 opening ring

30 Ring

31 External thread

32a First piercing element

32b-32e Second to fifth piercing element

33 Distance

34 Second cutting tooth

35 pressure element

36 thrust element

4 Warranty Protective Strip

40 Retention rib

5 connecting rib

6 connecting bridge

K Carton

D Packing area

Claims (15)

1. A plastic closure comprising
outlet part (1) for fastening on the package,
a screw cap (2) screwed onto the outlet part (1), and
an opening ring (3), made with the possibility of movement in the outlet part (1) along a helical line down to the package to open the package,
where the screw cap (2) is provided with at least one grip (24) configured to act on at least one thrust element (36) of the opening ring (3) so that when the screw cover (2) is first opened, the opening ring ( 3) moves inside the outlet part (1) to the lower position towards the package to open it, and when the outlet part (1) is subsequently closed with a screw cap (2), the opening ring (3) remains in the lower position, and
the opening ring (3) is provided with at least two protruding downward cutting and / or piercing elements (32a-32e), which are located on the peripheral periphery of the opening ring (3) and form its lower edge,
characterized in that the cutting and / or punching elements (32a-32e) are made essentially in the shape of a rectangle, the protruding downward longitudinal edge violates the shape of the rectangle and forms a protruding downward triangle, so that it forms a protruding downward point, and the longitudinal edge has a relatively the direction of rotation of the opening ring (3) in front of the descending section, and then the ascending section,
wherein the ascending section is made longer and gently sloping than the descending section. 2. The capping device according to claim 1, characterized in that the ascending portion of the longitudinal edge has a length that is at least 2.5 times the length of the descending portion. 3. The capping device according to claim 1 or 2, characterized in that an obtuse angle is formed between the ascending portion and the descending portion of the longitudinal edge. 4. The closure device according to claim 1 or 2, characterized in that the longitudinally protruding longitudinal edge at least on its descending portion forms a cutting edge. 5. The capping device according to claim 4, characterized in that the longitudinally protruding longitudinal edge forms a cutting edge both in its descending section and in the ascending section. 6. The capping device according to claim 4, characterized in that the cutting edge is made on the inner circumferential surface of the opening ring. 7. The capping device according to claim 1 or 2, characterized in that the cutting and / or punching elements protrude downward at the same distance. 8. The capping device according to claim 1 or 2, characterized in that the cutting and / or punching elements (32a-32e) are located on the peripheral periphery at the same distance from each other. 9. A capping device according to claim 1 or 2, characterized in that the opening ring (3) contains from four to six, preferably five, cutting and / or punching elements (32a-32e). 10. A capping device according to claim 1 or 2, characterized in that the opening ring (3) contains at least one clamping element (35), which together with the cutting and / or punching elements (32a-32e) forms the lower edge. 11. A closure device according to claim 10, characterized in that the opening ring (3) contains from three to five, preferably four, cutting and / or punching elements (32a-32e) and one clamping element (35). 12. A closure device according to claim 1 or 2, characterized in that the opening ring (3) is provided with an external thread (31), which is adapted to engage the internal thread (14) of the outlet part (1), so that the opening ring (3 ) rotates as it moves down. 13. The closure device according to claim 12, characterized in that the external thread has a stroke selected such that when unscrewing the screw cap, the opening ring rotates less than 360 °. 14. A capping device according to claim 1 or 2, characterized in that only one grip is provided (24). 15. A capping device according to claim 1 or 2, characterized in that on the flange (13) of the outlet part (1), ribs with retaining tips (15 ') are arranged parallel to the tangent to the outlet tip (10), with the help of which ribs (15) ) engage with the protective strip connected to the cover (2) and surrounding it at least partially.

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