WO2009111894A1

WO2009111894A1 - Can made of metal or plastic

Info

Publication number: WO2009111894A1
Application number: PCT/CH2008/000491
Authority: WO
Inventors: Artur Wichowski
Original assignee: Hoffmann Neopac Ag
Priority date: 2008-03-10
Filing date: 2008-11-20
Publication date: 2009-09-17
Also published as: CH698643A2

Abstract

The can (1) made of metal or plastic comprises a lid (5) having an annular sealing element (25). A substantially radially outwardly directed sealing lip (29) is integrally molded thereon. When the lid is fitted and screwed tight (5), the apex (S) of said sealing lip comes to rest against the upper edge of the container (3). If overpressure is present in the can (1), gas can escape to the outside by lifting the sealing lip (29). If the outside pressure p0 is higher, the sealing lip (29) is pressed more strongly against the container (3) and prevents air from entering.

Description

Can made of metal or plastic

The invention relates to a can made of metal or plastic according to the preamble of patent claim 1.

It is known to seal cans with a lid with a SchraubverSlip hermetically. In order to achieve the tightness, an annular, usually made of injected rubber seal is provided in the lid. Such seals serve their purpose and the can can be opened for the partial removal of the contents and then sealed again airtight. In order to ensure the tightness of cans even during prolonged holding period before the sale or before the first opening, in addition to the opening of the container part, a membrane made of aluminum can be sealed.

For the storage of products such as moist tobaccos (Smokeless Tobacco) such doses are not suitable, because by continued fermentation of the tobacco inside the can create an overpressure, the Bulging, deforming and / or in the worst case can cause the can to explode. A plastic deformation of the box causes its tightness is no longer guaranteed and consequently the access of oxygen into the can interior, ie to the contents can be prevented. Due to the access of oxygen, the contents may dry out and spoil in the worst case.

An object of the present invention is to provide a can which protects the contents both before the first partial removal of contents and then against the ingress of atmospheric oxygen, but at overpressure, either by fermentation or heat-related increase in volume of the air within the can allows a blow-off of gas from the inside of the can into the environment and after blowing safely prevents the ingress of oxygen from the environment even at temperature-induced negative pressure in the can.

This object is achieved by a box according to the features of claim 1. Advantageous embodiments of the box are described in the dependent claims.

By using an annular sealing element with an axially acting seal and a radially outwardly directed sealing lip, it is possible to blow off pressure from the can and at the same time if there is a negative pressure inside the can to prevent the ingress of outside air. By suitable design and dimensioning of the thread means the blow-off pressure can be adjusted. The very elastic axially acting sealing element retains its properties even after repeated opening and closing of the can.

Reference to an illustrated embodiment, the invention is explained in detail. Show it:

1 shows a box, left half in axial section, right

Half in view,

FIG. 2 is a side view of the can lid, FIG. 3 is a side view of the container part, FIG. 4 is an axial partial section through the can with the lid on, FIG. 5 is an axial section through a can in a further embodiment of the invention, FIG. 6 is a side view of the can in FIG. 8 shows an axial section through a box in a further embodiment of the invention, FIG. 9 shows a side view of the box in FIG. 8 and FIG. 10 shows an enlarged view of the box Edge region of the box in cross section (detail B in Figure 8). Reference numeral 1 denotes a box in the figures. This comprises a bottom of the can, briefly called container 3, and a lid 5. The cylindrical container 3 in the example is retracted in the region of its upper edge 7, ie the diameter of the container 3 is lower in the region of the upper edge 7 than in the lower part. Between the retracted area and the lower part, this creates a step or step 9. The upper edge of the container 3 is formed into a rolled edge 11. That is, the edge is approximately oval shaped by a forming process in cross section.

The lid 5 comprises a lid surface 13 which spans the opening of the container 3. On the cover 5, a cylindrically extending collar 15 is externally mounted, in which locking cams or threads 17 are formed by plastic deformation. The free edge 10 of the collar 15 is preferably turned over in order to guide the edge region, which may be sharp-edged by the trimming, out of the contact region when the cover 5 is opened. The locking cams or threads 17 on the collar 15 mesh with latching projections or threaded sections 21 on the recessed area of the container 1 (see FIG. 4).

In a circumferential bead 23 in the peripheral region of the lid surface, a sealing element 25 is inserted. This The root of the sealing lip 29 is located in the region of the smallest diameter of the annular support body 27. The free edge 31 of the sealing lip 29 is substantially radially to directed outside. The relaxed seal member 25 has an axial height Ji. ₁ The completely axially compressed sealing element 25 (not shown) has an axial height h ₂ . In axially together completely pressed sealing element 25 the sealing lip 29 comes into contact with the supporting body 27. In loosely on the container 1 applied lid 5 according to FIG 4, the distance between the underside of the lid surface 13 and the vertex S corresponds to the rolled rim 11 of height h _x of In this position, the free edge 31 of the sealing lip 29 is substantially without pressure on the vertex S of the rolling edge 11 at.

The lid 5 is pulled to close the container 3 by a rotation of the thread, ie the cooperating locking cams or threads 17 and the RastvorSprünge or threaded portions 21 or by axially pressing the lid 5 via the locking projections or threads 21, axially downwards. In this case, the sealing element 25 and the sealing lip 29 is pressed against the vertex S of the rolled edge 11. In order to achieve optimum tightness, the distance s is between the lower free Edge 19 on the collar 15 of the lid 5 and the step 9 on the container 1 defined such that the free edge 31 of the sealing lip 29 is pressed with a precisely defined force at the apex S.

The radially outwardly bent sealing lip 29 seen in cross-section is loaded only axially by the contact pressure of the cover 5 in the absence of a pressure difference between the atmospheric pressure p ₀ and internal pressure P ₁ . A gas exchange between the container interior and the atmosphere does not take place. At elevated internal pressure, for example by fermentation of the contents or increase in volume due to temperature increase, can escape between the apex S of the rolling edge 11 on the container 3 gas to the outside, since the sealing lip 29 is raised by the force acting in the interior of greater pressure. An increased external pressure Po compared to the internal pressure P _1, however, causes an increased pressing of the sealing lip 29 on the apex S, since the sealing lip 29 can not escape. This ensures that buckling of the lid surface 13 can be avoided at elevated internal pressure P ₁ .

The inventive container 1 may be made of metal or plastic. It is also a combination of a metal container 3 with a lid 5 made of plastic possible. The sealing element 25 may be loosely inserted into the bead 23 in the lid 5 or secured therein with an adhesive.

In the embodiment of the invention according to Figures 5 to 7, the sealing element 25 is no longer used in the lid 5, but it is part of an inner container 33, which is inserted into the outer box 1. The inner container 33 may alternatively consist only of a substantially cylindrical jacket-shaped insert part, which has no bottom, but is supported on the bottom of the container 3 (not shown). On the inner container 33, the sealing element 25 is formed in the upper region. It comprises the radially outwardly directed sealing lip 29, which comes into contact with the cover surface.

The inner container 33 can simultaneously act as a connection between the container 3 and the lid 5. For this purpose, a circumferential groove or a recess 37 is formed on the periphery of the inner container 33. In these, a first roller bead 39 engage the container 3 and a second roller bead 41 on the lid 5 a.

In the further embodiment of the invention according to Figures 8 to 10, the container 3 is made of plastic. At its upper edge 43, the sealing element 25 is attached to the sealing lip 29 by suitable means. in the In the example shown, a groove 45 widening towards its base is formed in the upper edge 43, into which groove a corresponding rib 47 on the sealing element 25 engages and snaps. This design makes it possible to produce the container 3 from a plastic that is harder than the plastic from which the sealing element 25 is made. Alternatively, the container 3 or the inner container 33 can be produced with the sealing element 25 in the 2K injection process, so that subsequent joining of the sealing element 25 and the container 3 is omitted. In this embodiment of the invention, the cover 5 engages below a bead 49 at the periphery of the container 3 made of plastic.

Legend

1 can

3 containers 5 lids

7 upper edge

9 step

11 rolled edge

13 lid surface

15 collar

17 locking cams or threads

19 free edge

21 locking projections or threaded sections

23 bead

25 sealing element

27 supporting body 29 sealing lip 31 free edge 33 inner container 35 sealing edge

37 puncture

39 first Rollbördel 41 second Rollbördel

43 top edge of 3

45 groove

47 rib

49 bead

Claims

claims

1. box made of metal or plastic, comprising a container (3) and a lid (5) which is sealingly connectable to the container (3) and reclosable for a partial removal of the filling material, characterized in that between the lid (5) and a sealing element (25) is formed at the upper edge (7) of the container (3, 33), which allows an outflow of gas from the container (3) at elevated internal pressure P ₁ , but at elevated external pressure p ₀ the admission of oxygen into the interior of the container.

2. Box according to claim 1, characterized in that a seal with an axially acting lip (29) is used as a sealing element (25).

3. Box according to claim 2, characterized in that the sealing element (25) in the lid (5), on the container (3) or on an inner container (33) is arranged.

4. Box according to one of claims 2 or 3, characterized in that the free edge (31) of the lip

(29) of the sealing element (25) is oriented substantially radially outwards.

5. Box according to one of claims 2 to 4, characterized in that a supporting body (27) on the sealing element (25) inserted in a circumferential bead (23) in the lid (5) and held and / or glued.

6. Box according to one of claims 3 or 4, characterized in that the sealing element (25) attached to the inner container (33) or connected together with this manufactured in 2K injection molding.

7. Box according to one of claims 2 to 5, characterized in that the lid (5) and the container

(3) by a latching means (17,21) is latched together and the latching means by latching cams (17) on the cover (5) and latching projections (21) on the container (3) are formed.

8. Box according to one of claims 3 to 6, characterized in that the cover (5) on a circumferential recess (37) on the inner container (33) can be latched.

9. Box according to claim 7, characterized in that the latching means of suitable on the collar (15) of the lid (5) and on the container (3) formed threads (17) and threaded portions (21) are formed.

10. Box according to one of claims 7 to 9, characterized in that the latching means (17,21) are formed such that the lip (29) of the sealing element (25) on the cover (5) is pressed with a force which a Escape of gas from the container (3) allows for defined overpressure.

11. Box according to claim 10, characterized in that when mounted and latched cover (5) of the lower edge of the collar (15) of the lid (5) at one stage

(9) on the container (3) comes into abutment, such that between the sealing element (25) receiving bead (23) in the lid (5) and the upper edge of the container (3) is a defined axial distance, which is smaller than the axial height h _{x of} the relaxed sealing element (25) and greater than the minimum axial height h _{2 of} the compressed sealing element (25).