MXPA01001878A - Sealing cap - Google Patents

Abstract

The invention relates to a sealing cap (1) which has a base (2) and a skirt (3) and comprises an internal seal (4). Said internal seal is provided with ventilation recesses (11) which cancel out the sealing effect when the cap base (2) is moved axially upward. The sealing cap (1) further comprises a first stop end (7) and a second stop end (8). When the cap is unscrewed the second stop end (8) is the first to engage the opening of the container, so that a weak zone (9) in the area of the cap wall (3) is prestressed to a defined value. On the basis of the definable prestress of the weak zone (9), ventilation can be achieved at a precisely defined positive pressure.

Description

CLOSURE HOOD FIELD OF THE INVENTION The invention relates to a closure hood with the features of the introductory idea of claim 1. BACKGROUND OF THE INVENTION The closure hoods made of synthetic material are applied in a multitude of container closures, for example, beverage bottles. Especially in beverages containing carbonic acid, but also in fruit juices, there is a problem that the internal pressure in the container over time may increase (due to an increase in temperature or fermentation) because the closing hoods should normally be sealed as well as possible to avoid leakage there is the danger that the container, due to an increased internal pressure, will bounce. Mainly in glass bottles represent exploded glass splinters a potential danger. In order to solve this problem, different kinds of closure hoods have already been proposed. For example, EP 597 867 discloses a closure hood provided with a hermetic application that simultaneously defines the screw-in position of the closure hood, with an internal pressure. Increased the sealing disk must be compressed and thus act as an overpressure valve. From EP 464 384 a self-evacuating bottle closure of the air is known in which by weakening the head plate the sealing effect can be removed by an increased internal pressure. From DE 196 13 830 another self-evacuating air closure is known in which the floor of the hood is weakened. The weakening leads to that with an increased internal pressure the hood floor is pushed out (called dome formation) and then an internal tightness formed in one piece with the floor of the hood produces the discharge of the pressure. All these known solutions have certain disadvantages. The degree of compression of an applied sealing disc is only very difficult to control. In addition, the pressure of the sealing disc in the entire periphery of the mouth of the container is homogeneous, so that the exact control of the air evacuation process becomes more difficult. In the closing hood provided with weakening in the head plate the problem arises that an internal sealing due to the formation of the dome can discharge the pressure, but that sealing which ermetizan in the edge of the upper opening and mainly in the outside of the mouth of the container are not allowed to discharge from the pressure in that manner. SUMMARY OF THE INVENTION It is a task of the invention to avoid the disadvantages known especially as such, to create a closing hood which allows with optimum sealing under normal conditions an additional and exactly controllable evacuation with a higher internal pressure in the containers closed by that closing hood. The closing hood must be easy to manufacture and inexpensive and must be screwed with a conventional screwdriver. According to the invention this task is solved with a closing hood having the properties shown in the characteristic part of claim 1. The closing hood consists essentially of a hood floor and a hood wall. A peripheral internal seal is provided on the hood floor. The sealing is provided with a sealing line which is prismatic against the inner side of the mouth of the container and thus reaches a sealing effect. The closing hood can be retained over the mouth with retaining elements arranged on the inner side of the wall of the hood, for example a screw thread. Presents a first stop which jumps something from the floor of the closing hood. According to the invention, a second stop is arranged axially between the retaining elements and the first stop to limit the screwing-in movement of the closing hood. The second stop can, for example, enter into engagement with the principle of a thread in the mouth of the container and thus limit the screwing movement. The second stop is advantageously constructed as in a peripheral ring, whose stop plane runs approximately perpendicular to the axis of the closing hood. The wall of the hood is also provided with a deformable wall section. The deformable wall section is disposed between the first and the second stop. The deformation capacity can be achieved by a weakening of the wall thickness in the area of the wall section, for example by a collapse in the inner side of the hood wall. The inventors of the present invention have found that a weakening of the closure hood in the area of the wall of the hood against known weaknesses in the floor of the hood presents surprising advantages. An internal pressure in the container closed by the closing hood does not lead first to a movement of the floor of the hood, but to an axial displacement of the floor of the hood. Thus, movement is essentially linear. This means that all accidental alloys on the outer side or on the front side of the container mouth produce an external sealing grip due to the axial translational movement of the hood floor. It is understood that a certain curvature could also be presented as before. For the closing hood to produce an evacuation at the right moment, there is the axial distance between the first and the second stop chosen in such a way on the one hand and on the other hand the depth of penetration of the sealing line, which the line of sealing at a predetermined internal pressure, causes an external grip with the inner side of the container mouth. This minimum pressure is different depending on the material placed in the container. With fruit juices is approximately 2 bar, light beverages containing C02, is 5 bar pressure and with a content of 4% vol. of C02, greater than 8 bar. The degree of deformation capacity of the section of the wall is likewise selected correspondingly.

The first stop during screwing enters into engagement with the upper side with the mouth of the container before the second stop comes into engagement with the periphery of the thread. Intermediately, the first stop and the deformable wall area are deformed due to the screwing movement. The depth of penetration of the sealing line indicates the axial distance of the sealing line of the first stop in the deformed state or the distance of the sealing line from the upper side of the mouth of the container. By the objective selection of the distance between the stops and the deformation of the wall section, the deformable wall section is tensioned during the screwing of the closure in the form of a spring of a predetermined value. By a suitable selection of the depth of penetration of the sealing line, the moment of the evacuation is predeterminable. If the internal pressure is so great that the floor of the hood is pushed against the spring force around the penetration sink, it will evacuate the closure. The deformation capacity for normal conditions is adjusted, this is for temperatures in the area of 15 -35 ° C if the external temperature exceeds these values, the greater deformation capacity is made (softening of the plastic material). The evacuation function is thus favorable at a higher temperature. The two stops serve for the exact definition of the prestressing of the softening zone in the hood wall. Here you can set a predefined evacuation pressure. The internal sealing also advantageously has evacuation notches on its side in front of the skirt of the hood. The evacuation notches are arranged below the sealing line. The internal sealing is advantageously constructed as a so-called sealing of olives. This means that the sealing line defines a maximum external diameter of the internal sealing and is arranged at a distance from the internal floor side of the hood. Such olive sealings have the advantage of sealing inside the mouth of the container, where a precisely defined sealing surface without damage is normally found. However, the disadvantage of such olive pressures is that, due to the pretension, they are already sealed when the closing hood is not in the fixed position, but slightly upwards axially to the sealing position. Thanks to the evacuation notches, which advantageously starts directly below the sealing line, the sealing effect is removed as soon as the sealing line is outside the mouth of the container. A prolongation of the sealing effect due to a displacement of the sealing line, is thereby prevented on the inner sealing which narrows downwardly conically. The closure hood may also be provided with a peripheral sealing flange which is pressable against the outer side of the container mouth. The sealing lip is arranged axially between the first and the second stop. The closing hood is advantageously provided with opening elements. Such opening elements can, for example, be provided upstream of the sealing line on the upper surface of the internal seal in front of the wall of the hood. The opening elements prevent a displacement of the sealing line. However, with a high internal pressure, a dome formation will be present on the floor of the hood, then the opening elements rest on the mouth of the container, so that the position of the internal sealing varies according to the mouth of mouth in the essentials only by a translation. The opening retention elements can be understood to exist in the usual sealing elements, in particular in the second stop which acts as sealing or in the ring-shaped flange optionally pressed against the outer side of the container. DESCRON OF THE DRAWINGS The invention will be described in more detail by embodiments with reference to the drawings. Where it shows: Figure 1, a cross section through a closure hood according to the invention; Figure 2, an enlarged section of the sealing part of a closing hood on a container mouth. Figure 3, an enlarged representation of the sealing part of a closure in a container with elevated internal pressure; Figure 4, a schematic representation of a bottom view of a closing hood. DESCRIPTION OF THE INVENTION Figure 1 shows a closing hood 1, which essentially consists of a hood floor 2 and a hood wall 3. The hood wall 3 is provided with a screw thread 6 with which You can screw or screw the closing hood 1 over the mouth of a container. On the inner side of the floor of the hood 2, an internal seal 4 is provided in the form of a peripheral sealing lip. The internal seal 4 is constructed as a seal called olive.

The internal sealing 4, has a sealing line 5, which is pressable against the inner side of a container mouth. The sealing line 5 is disposed at a certain distance to the inner side of the hood floor 2 and defines the maximum external diameter of the surface 10 of the internal seal 4 in front of the hood skirt 3. The internal seal 4 is provided below of the sealing line 5 with evacuation recesses 11 which are arranged on the surface 10. On the inner side the hood floor 2 is provided with a first stop 8. The first stop 8 is constructed as a peripheral rim, which has simultaneously a sealing function. Above the end of the thread 6, a second stop 7 is arranged next to the inner side of the hood wall 3 above the thread 6. The stop 7 has a stop plane running approximately perpendicular to the axis of the closing hood. The stops 7, 8 are spaced apart in an axial direction by a predetermined distance d. Between the first stop 8 and the second stop 7, the hood wall 3 is provided with a deformable wall area 9. On the surface 10 of the internal seal 4, opening maintenance elements 13 are also arranged, which ensure that the The sealing line 5 does not push the internal sealing 4, that is, the internal sealing 4 only in the internal sealing area 5 can be supported by sealing on the internal side of the container mouth. The outer side of the hood skirt 3 is further provided with a rib or ribs 14, which provide the hood wall 3 below the weakened area 9 with sufficient strength and good gripping properties. The closing hood 1 can also be provided with a guarantee band 15 and with vertical evacuation grooves 16, which interrupt the thread 6. Such guarantee bands and evacuation grooves are known to the person skilled in the art. In FIG. 2, the sealing part of the closing hood according to claim 1 is enlarged. If the closing hood 1 is screwed onto a container mouth 20, first the stop 8 comes to the grip with the front side 23. from the container mouth 20. When the screw is continued, the hood wall 3 deforms in the area of the deformable wall section 9, while the second stop 7 reaches the grip with the thread principle 22 of the mouth of the container 20. In the fully-placed state, the deformable wall area 9 is left taut to an exactly predetermined value. Simultaneously it seals a peripheral sealing flange 12 against the external side 24 of the container mouth 20. On the inner side 21, of the mouth of the container 20, it is supported by sealing the internal sealing 4 with the sealing line 5. The line of Sealing 5, has a predetermined depth of penetration t by the position relative to the second stop 7, in the mouth of the container. As soon as the internal pressure increases in the container closed with the closing hood 1, the hood floor 2 will be displaced upwards in the direction A (see figure 3). The axial displacement of the hood floor 2 is favored by the deformable wall section 9. The second stop 7 remains in engagement with the thread principle 22 of the container mouth 20. The first stop 8 is lifted from the front side 23 of the container mouth 20 and the internal seal 4 slides along the inner side 21 of the container mouth 20 in the direction of the arrow A upwards, so that the sealing line 5 is out of engagement with the inner side 21. A higher internal pressure, can therefore be compensated by the evacuation notches 11. Between the second stop 7 and the thread principle 22 there is a sealing contact due to the slope of the thread only on a short peripheral section. The pressure of the internal pressure is furthermore favored by the evacuation slots 16 shown in FIG. 1. By the axial displacement of the hood floor 2, the flange 12 pressed against the outer side 24 of the container mouth 20 is also discharged, so that an evacuation is possible. The evacuation recesses 11 have a special advantage, because the internal sealing 4 is introduced under tension in the mouth of the container and the sealing line 5 is disposed deep in the mouth of the container. Due to the evacuation recesses 11, an evacuation takes place, as soon as the sealing line 5 is out of engagement with the internal surface 21 with the mouth of the container. Without the evacuation recesses 11, the surface 10 of the internal seal 4 would remain due to the pretension also of the sealing line 5 during the axial displacement still in an airtight grip with the inner side 21 of the container mouth 20. The element of opening maintenance 13 or the opening maintenance elements 13, ensure a straight line displacement of the hood floor 2 and prevent the internal sealing 4 from making a tilting movement; that is, that it rolls on the surface that is above the sealing line 5. In figure 4, the closing hood 1 is schematically represented in a bottom view. The threads, stops and the sealing lip that remains outside 12, have been removed for the sake of simplification. The evacuation recesses 11 and the opening maintenance elements 13 are arranged in a regular manner on the periphery of the internal sealing 4. The core of the invention consists in that the hood floor 2 is constructed without weakening in such a way that hinders or prevents a dome formation of the hood floor, this is an outward movement. Instead of this, a deformable wall section 9 is provided in the area of the hood wall 3. This weakening in the area of the hood wall 3 allows an axial movement of the hood floor with an increased pressure. The representation shown in figure 3 is exceeded for the indication of the gas outlet process. In reality, the floor of the hood rises when the internal pressure increases only a minimal amount. As soon as the internal pressure becomes smaller, the floor of the hood 2 falls back and the sealing hood 1 is re-sealed. It has been shown that with such systems the internal pressure can be maintained in containers for several weeks at a time. a sufficiently low value. Here we must observe a multiplicity of evacuation processes that follow one another. It is essential for the degree of tension of the weakening zone 9, the distance d between the first stop 7 and the second stop 8 compared to the axial distance d between the upper edge of the thread principle 22 and the front side 23 of the container mouth 20. The distance between the stops 7, 8 measured in the embodiment 1.3 to 1.5 mm. The distance between the upper edge of the thread principle 22 and the front side 23 of the container mouth 20 is 1.7 mm. The penetration depth t of the sealing line 5 measured according to the container content of 0.8 to 1.0 mm. The evacuation recesses 11 are arranged at a distance of 0.2 to 0.3 mm below the sealing line 5 on the surface 10 of the internal seal 4. The evacuation cleat 11 extends against the lower end of the internal seal 4 , at least on that part of the surface 10 of the internal mounting 4, which when screwing or unscrewing the closing hood 1 can remain in engagement with the inner side 21 of the container mouth.

Claims (8)

1. NOVELTY OF THE INVENTION Having described the invention as above, it is claimed as property contained in the following CLAIMS 1. Closing hood with a hood floor and a hood wall that has a peripheral internal sealing projecting from the floor of the hood, with a sealing line, which can be carried by screwing the closing hood to the grip with the inner side of a container mouth and with retaining elements arranged in the wall of the hood to stop the closing hood in the mouth of the container , characterized in that the closing hood has a first stop which protrudes from the floor of the hood, and the closing hood has between the retaining elements and the first stop a second stop to limit the screwing movement and the hood wall is provided with a deformable wall section that is arranged axially between the first stop and the second stop, between the distance of the first The stop and the second stop, the depth of penetration of the sealing line and the degree of deformation capacity of the wall section are chosen in such a way that the sealing line with a predeterminable internal pressure can be brought out of the grip of the wall. sealing with the inside of the mouth of the container.
2. 2. De-fRbierre hood, according to claim 1, characterized in that the first stop and the second stop are arranged in such a way that the second stop is movable with the thread principle of the mouth of the container, after which the first stop has reached the grip with the front side of the mouth of the container. Closing hood according to one of the claims 1 or 2, characterized in that the internal seal has on its surface in front of the hood stop at least one evacuation notch disposed below the sealing line. Closing hood according to claim 3, characterized in that the evacuation notch starts immediately below the sealing line and extends to the end of the external sealing. Closing hood according to one of claims 1 to 4, characterized in that the closing hood has a peripheral sealing lip which is arranged axially between the first and the second stop and which is pressed against the outer side of the mouth of container. Closing hood according to one of claims 1 to 5, characterized in that the surface of the internal sealing opposite the skirt of the hood has at least one opening maintenance element, which is arranged axially above the opening. sealing line. Closing hood according to one of claims 1 to 6, characterized in that the deformable wall section is formed by a weakening of the wall thickness, preferably by a collapse on the inner side of the hood wall. 8. Pack with a closure hood according to one of claims 1 to 7, with a container with a container mouth provided with a thread, where the container mouth has a front side with which the first container is removable stop, where the thread presents a principle with which it is portable to the 'grip the second stop of the closing hood and where the axial distance between the front side and the beginning of the thread is greater than the axial distance between the first stop and the second stop.