EP0513265B1 - Container with snap-on lid - Google Patents

Abstract

A container (1) with a snap-on lid with an at least one-part body (2) and a lid (4) which, together with a body component at the closure end of the body, forms a sealed closure, in which there is a lever gap between the body and lid for the engagement of a lever via which the lid can be levered up, whereby the lid has a circumferential sprung engagement lip (8) which engages from inside under tension in a sealing groove in the body component matching the shape of the engagement lip (in accordance with patent application P 40 29 146.4), whereby the engagement lip of the lid engages elastically in an inwardly rolled upper circumferential edge in the body component instead of in separately made sealing groove.

Description

The invention relates to a pressure lid can according to the preamble of claim 1.

Such a box is e.g. B. from CH-A-607701 known. It is relatively complicated to open and can even be damaged. The likelihood of occurrence and the extent of damage increases with each opening, which leads to wear on the can. Even a tight seal is no longer ensured when the cans are opened several times.

Another generic pressure lid can is known from DE-A-4029146. Such a box can be opened easily and without destruction without special tools. However, the manufacture of your fuselage body has not yet been sufficiently simplified, and its filling and closing have not yet been sufficiently optimized.

The invention is therefore based on the object of overcoming the problems mentioned above with a view to the production of a simplified design of the fuselage and the lid body.

According to the invention, this object is achieved in that the peripheral edge flanging is rolled inwards, into the fuselage body, the fuselage bead is embossed inwards or the step is offset into the inside of the fuselage body, the engagement lip is rolled upwards and forms the outer peripheral edge of the cover body, and the lid body can be inserted from the inside under pretension into the fuselage body such that the engagement lip engages under the circumferential edge flanging and sits on the fuselage bead or step, wherein a lever in the lever gap between the circumferential edge flanging and a is opened to open the closure thus formed between the lid body and the fuselage body concave protuberance is formed in the cover surface, so that the peripheral edge flange can be pressed outwards and the engagement lip can be pulled inwards.

It is preferably provided that a sealing compound is provided below the peripheral edge flanging in the area in which the engagement lip engages.

Fig. 1

einen teilweisen Querschnitt durch den Verschlußbereich eines ersten Ausführungsbeispiels der erfindungsgemäßen Druckdeckeldose im verschlossenen Zustand;

Fig. 2

einen teilweisen Querschnitt durch den Verschlußbereich eines zweiten Ausführungsbeispiels der erfindungsgemäßen Druckdeckeldose im verschlossenen Zustand;

Fig. 3

einen teilweisen Querschnitt durch den Verschlußbereich des ersten Ausführungsbeispiels der erfindungsgemäßen Druckdeckeldose während des Verschlußvorganges;

Fig. 4

eine ähnliche Ansicht wie in Fig. 3, die ein späteres Stadium des Verschlußvorganges zeigt;

Fig. 5

eine Schematische Querschnittsansicht durch einen erfindungsgemäßen Deckelkörper mit eingebauten Überdruckventil in abdichtendem Zustand; und

Fig. 6

eine Darstellung wie in Fig. 5, die das entsprechende Überdruckventil während des Entweichen von expandierendem Gas aus dem Doseninneren zeigt.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. It shows:

Fig. 1

a partial cross section through the closure area of a first embodiment of the pressure lid can according to the invention in the closed state;

Fig. 2

a partial cross section through the closure area of a second embodiment of the pressure lid can according to the invention in the closed state;

Fig. 3

a partial cross section through the closure area of the first embodiment of the pressure cap can according to the invention during the sealing process;

Fig. 4

a view similar to Figure 3 showing a later stage of the locking process;

Fig. 5

a schematic cross-sectional view through a lid body according to the invention with built-in pressure relief valve in the sealing state; and

Fig. 6

a representation as in Fig. 5, which shows the corresponding pressure relief valve during the escape of expanding gas from the interior of the can.

The pressure cap can 1 consists of a cylindrical body 2, the upper end of which represents the body element 6. The pressure lid can 1 is closed in this part with a lid body 4, the engagement lip 8 of which resiliently engages in the space between the inwardly rolled upper peripheral edge flange 10 of the fuselage element 6 and the inwardly shaped fuselage bead 18. The distance between the fuselage corresponds to this 18 and the lower end of the peripheral edge flange 10 substantially the outer diameter of the engagement lip 8, so that it directly engages under the peripheral edge flange.

Alternatively, as shown in FIG. 2, the engagement lip 8 of a cover body 4 'can also be supported downwards on a step 20 which arises from the fact that the diameter of the body body 2 is at a distance which is also essentially the outside diameter corresponds to the engagement lip, reduced. This embodiment is particularly preferred when such a can shape is already specified, for example in the case of relatively flat shells.

For a hermetic seal of the lid closure, a sealing compound 22 is provided in both cases between the engagement lip 8 and the space between the peripheral edge flange 10 and the fuselage bead 18 or step 20, the lid body 4 or 4 'and fuselage body 2 preferably being joined together while the sealing compound is still liquid. Bactericidal treatment of the sealant, for example with ascorbic acid, can effectively prevent bacteria from penetrating the seal.

Regardless of whether a sealant 22 is used or not, the lid body 4 or 4 'can be used again in any case to close the pressure lid can again. This also opens up the possibility of using the inventive pressure lid can (as well as the pressure lid can according to main patent application P 40 29 146.4) several times, possibly in the form of reusable packaging.

The representations in FIGS. 3 and 4 show the process of the automated closing of the invention for the first time Pressure lid can after filling. For this purpose, the cover body 4 is first inserted under prestress into the closure head 30 of a closure device. In this state, the diameter of the cover is reduced to such an extent that the engagement lip 8 is arranged on the entire peripheral edge of the cover body in the position shown in FIG. 3 at a slight distance from the upper end 13 of the peripheral edge flange 10. When the closure head 30 moves deeper, the engagement lip and the tapered inner peripheral surface 12 of the peripheral edge flange 10 meet, in which state any excess filler material is squeezed off.

When the breech head moves deeper, the peripheral edge flanging 10 is pressed outward over its entire circumference about an axis which lies approximately in the area of the fuselage bead 18, first of all by the engagement lip 8 itself and then by the corresponding ring extension 32 of the breech head 30 (see Fig. 4). If the engagement lip 8 is at the level of the space between the peripheral edge flange 10 and the fuselage bead 18, into which the sealing compound 22 has preferably been introduced while still in a liquid state, the closure head 30 moves by actuating the ejector 34, which is located on the upper end 13 the peripheral edge flange 10 supports, again upwards, the cover body 4 now resiliently engages under the peripheral edge flange 10 in the manner shown in FIG. 1 and together with the plasticizing sealing compound 22 forms a hermetic seal of the pressure lid box.

If the pressure lid according to the invention is pressed in as a container closure when the can filler is filled for the first time, the dome space, which is free of product, can be filled with steam at the moment of being pressed in with a lance with a corresponding lid shape. The condensation of the steam leads to a negative pressure in the container, which pulls the lid onto the area of the fuselage element 6 covered with sealing compound 22.

When using a lid body 4 or 4 ', means for a suitable pressure reduction can be built into the can during the sterilization in order to reduce an overpressure resulting from air or gas. 5 and 6, such an integrated, semi-permeable pressure relief valve (a so-called coffee valve) and its function are shown. When the can is closed without excess pressure, the membrane 42 of the excess pressure valve 40 lies sealingly on the sealing surface 44 and thereby covers the openings 46 to the interior of the can (FIG. 5). If an overpressure arises in the can (for example during sterilization), the membrane 42 is lifted from the sealing surface 44 in the area of the openings 46, so that the expanding gas can flow out of the inside of the can through the openings 46 and 48 and thus in the Overpressure generated inside the can is reduced.

Reference list

1

Pressure lid can

2nd

Trunk body

4th

Lid body

4 '

Lid body

6

Fuselage element

8th

Engaging lip

10th

Peripheral edge flanging

12th

inner circumferential surface of 10

13

upper end of 10

18th

Fuselage

20th

step

22

Sealant

30th

Locking head

32

Annular process of 30

34

Ejector

40

Pressure relief valve

42

membrane

44

Sealing surface

46

Opening in 44

48

Opening

Claims (2)

1. Press-in-lid container (1), comprising a body (2) and a lid (4, 4'), the body (2) having, at its upper end to be closed by the lid (4, 4'), a body element (6) which has a circumferential edge flange (10) and, at a distance below the circumferential edge flange (10), a bead (18) or a step (20), the lid (4, 4') having a resilient engagement lip (8), and the lid (4, 4') engaging both on the circumferential edge flange (10) and on the bead (18) or step (20) of the body element (6) for sealed closure of the press-in-lid container (1), it being possible for the lid (4, 4') to be introduced from the inside, with pretensioning, into the body (2) in such a way that the engagement lip (8) engages under the circumferential edge flange (10) and sits on the bead (18) or the step (20), and for the purpose of opening the closure thus formed between lid (4, 4') and body (2) a leverage gap remains free for the engagement of a lever, by means of which the lid (4, 4') can be levered up, and the said distance between the circumferential edge flange (10) and the bead (18) or the step (20) corresponding essentially to the height of the engagement lip (8), characterized in that the circumferential edge flange (10) is rolled inwards into the body (2), the bead (18) is punched inwards or the step (20) is directed into the interior of the body (2), the engagement lip (8) is rolled upwards and forms the outer circumferential edge of the lid (4, 4'), and in that the leverage gap is formed between the circumferential edge flange (10) and a concave protrusion in the lid surface (4, 4'), so that the circumferential edge flange (10) can be pressed outwards and the engagement lip (8) can be drawn inwards.
2. Press-in-lid container according to Claim 1, characterized in that a sealing material (22) is provided below the circumferential edge flange (10) in the area into which the engagement lip engages.

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