DE10005579A1 - Container with body and lid - Google Patents

Abstract

The invention relates to a container comprising a drum-like body (1) and a tight cover (2) that fits the same, which protects the contents against contamination during transport and storage, permits a repeated opening and closing without reducing the level of hermeticity, and dispenses of the use of an elastomeric seal as an additional material component. The inventive container is characterized in that the cover (2), at least when in a tensioned state, fits tightly onto the body (1) at at least two interspaced continuous sealing points (4, 5), which encircle the axis of symmetry of the container in an annular manner.

Description

I. Field of application

The invention relates to a container with a barrel-like body and matching, tight lid.

II. Technical background

It is common today for the powdered homo-. and copolymers of Tetrafluoroethylene (TFE) in barrel-like plastic containers or fiber drums, preferably with a pot-shaped body and matching lid, to fill. The task of the containers, the polymers mentioned, is frequent are manufactured and processed under clean room conditions, from dust and To protect moisture and pressure loads. Foreign matter of all kinds, Moisture and polymer particles compressed by pressure load contribute the processing of the TFE polymers into defects in those made from them Moldings or extrudates, particularly in thin-walled products such as wire coatings or foils are unacceptable.

For high-quality end uses, packaging of Polytetrafluoroethylene (PTFE) powders made of plastic containers, for example Polypropylene, preferred over fiber drums because they are better Have surface quality and the insertion of a film inner bag for protection the powder can be omitted.  

Different requirements are placed on the plastic containers: They have to be sufficiently tight, even if they are opened several times and Close. You must also according to DE-U-94 08 630 Withstand the load pressure that occurs when stacking the filled occurs on the individual packaging units. In practice, two to four Pallet stacks stacked one on top of the other, which in turn have two to three layers Containers are loaded. The containers are filled with 20 to 50 kg of powder. At the filling may not exceed certain dumping heights in the container , otherwise the powder may cake together and a error-free processing is not guaranteed.

Containers for PTFE powder in their technically complex, high quality Designs are preferably made by injection molding. Come here Bulk plastics such as polypropylene or polyethylene for price reasons for use. Because the containers are extremely stable during transport and storage, even at temperatures from -20 ° C to 60 ° C, chemically modified propylene copolymers are preferred as the material used. The packaging systems have a high value, so one Reuse, for example by cleaning and refilling, is aimed at becomes.

The sealing of the containers for PTFE powder are very special Requirements. Compared to the well-known one-lid system, for An example of color is the packaging system according to EP-B-362 959 around a round three - component system consisting of container body, lid and Tension ring. The principle of sealing is that the upper body part after runs downwards inclined, whereas thin flags in the Press the inner edge of the lid onto the upper part of the body using the tension ring become. However, the resilience of these flags of convenience is low, so that after a first opening and reclosing the tightness strong subsides. Reuse the lid and recycle the container is practically not possible.  

In addition, the manufacture of the sealing thin sealing lips by the Injection molding process is technically very complex and prone to failure because of that complete spraying of the thin sealing lips an elaborate ventilation in the Injection mold must be available. In the injection molding process, it can Example by polymeric deposits to a complete or partial Clogging of the venting areas come up, resulting in an incomplete Splashing out of the thin surrounding flags leads to the sealing function is no longer guaranteed.

Analogously, this type of sealing with thin flags in the Lid interior in WO-A-96/37 410 for a rectangular plastic container described.

According to US-A-4 674 650 a seal for a round container is made Plastic described, which consists of the container body, lid and clamping ring. The seal is made by an additional sealing ring inserted in the lid, that seals the outer, downward-facing body. The Introduction of an additional sealing ring made of an elastic material Various disadvantages: It makes the system more expensive, complicates the automatic one The packaging system must be cleaned before use and must be disposed of the packaging system as an additional material component, if the container material is to be recycled.

With a commercial packaging system consisting of a container body, Lid and clamping ring, the company Sulo Plast GmbH & Co. KG, the tightness produced by an elastomer seal, for example made of polyurethane, in a groove in the cover is cast in. This elastomer seal seals towards the top of the body. The main disadvantage of this system is that under the load pressure of the elastomer seal Transport and storage can damage the seal. Parts of the Seals are removed and can be in the PTFE powder to be protected  reach. In addition, the elastomer component must also be separated here the container lids after using the packaging system be sent to a recycling process.

III. Presentation of the invention a) Technical task

It is the object of the present invention to provide a container with a Provide sealing that a during transport and storage Excludes contamination of the content, repeated opening and closing allows without loss of tightness and without an elastomeric seal as additional material component needs.

b) solving the problem

This object is achieved by the characterizing features of claim 1 solved. Advantageous embodiments result from the subclaims.

By the at least two spatially separated from each other - and in particular their relatively movable - sealing points is a higher one Seal security given and on the other hand because of the relative mobility of the sealing points to each other, i.e. either that at the sealing points active sealing webs or the opposing sealing surfaces - a high Probability that there is a seal at both sealing points given is.

Because of the cup-shaped container that is open on one side and fits on it Cover, the sealing points are always closed all round, no matter whether the basic shape of the container is round or polygon.  

Furthermore, the first sealing point is described below so that the sealing surface (groove) in the cover and the sealing web (upper edge of the Body wall) is formed on the container, while this assignment in the second sealing point (flange) is just reversed.

For one or all of the two sealing points, the assignment of Sealing surface and sealing web to the body or lid also vice versa be reversed, for example the free upper end of the body edge V-shaped be grooved, in which a suitable projection of the cover could intervene.

Because of the high sealing probability of each individual sealing point and especially because of the high seal security of the container several separate sealing points and their mobility to each other at the sealing points, the body and lid lie directly against one another, So without the interposition of a special, more elastic sealing material are risked with the advantage of easier recyclability and one reduced risk of content contamination due to detachment Components of the sealing material.

By sufficient axial spacing of the sealing points, the Distance used for length compensation and thus the Sealing probability at both sealing points can be increased. If additionally at least one of the sealing points in several partial sealing points divided, this further increases the probability of sealing, even if the z. B. Sealing webs of the partial sealing points not relative to each other or are hardly mobile.

The following descriptions only refer to the cross-section form the corresponding places on the lid or body. However, these are always formed in a circular manner corresponding to that in a circular manner  - round or polygons or free-form - shape of the body, that is its peripheral walls, under supervision.

In a preferred embodiment, the first sealing point consists of the free upper end of the body edge as a sealing web, on the one in the lower side of the lid formed groove with a preferably V-shaped cross section sits. This groove area of the cover forming the groove goes radially inwards the main part of the lid, the central area above and on the outside in a connection area parallel to this on the outside of the wall or obliquely, e.g. B. with increasing distance, is directed downwards outwards.

At the lower end, the connection area merges into a lid edge, the a fork-shaped or U-shaped cross-section with downward facing free ends, the sealing webs.

With their free ends, these sealing webs can face upwards facing sealing surface can be pressed by means of a clamping device, the the top of a flange projecting outwards from the body wall represents.

The ring-shaped circumferential sealing surface against which the sealing web (s) can press horizontally, i.e. exactly perpendicular to the longitudinal direction of the Container, usually the axis of symmetry of the body and the lid, run or inclined to this, for example radially from the outside inwards decreasing, i.e. with increasing distance in the longitudinal direction compared to the free ending edge of the body.

Pressing the lid and body against each other, especially on both Sealing points, is caused by a clamping device, often a radial from the outside inwards both the edge of the lid and the neighboring one Flange of the clamping ring encircling the body.  

The clamping ring has a radially inward open, with sloping flanks equipped groove, the inner surfaces of which extend from the bottom of the groove to the open one End, that is, in the assembled state from the radially outside inwards, increasingly separate from each other.

The rear sides facing away from the sealing surface are also in the same way Both the edge of the lid and the flange are inclined:

The upward-facing back of the lid rim falls from the inside on the outside diagonally downwards, while the backside of the Flange rises diagonally from the inside to the outside, according to the inclination of the Inner flanks of the clamping ring to each other.

The likelihood of tight sealing of both sealing points becomes strong increased by the mobility of the elements forming the two sealing points either on the side of the lid or on the side of the body.

In practice, the ring flange is 10 mm to 100 mm, in particular 30 mm, below arranged the body edge and cantilevered 10 mm to 50 mm, in particular 20 mm, radially outwards. The all-round sealing bars on the ring flange of the body or can be arranged on the edge of the lid, are 1 mm to 15 mm, in particular 3.5 mm, high and 1 to 10 mm, in particular 3 mm, wide.

c) working examples

Embodiments according to the invention - with different dimensional Relations between lid and body edge - are closer in the figures described. Show it:  

Fig. 1: the lid located on the body in the relaxed and in the tensioned state with a large axial extension of the lid and

Fig. 2: the lid located on the body in the relaxed and in the tensioned state with little axial extension of the lid, and

Fig. 3: a third variant of the container.

Figs. 1 and 2 show, respectively, along the longitudinal axis in section, the axis of symmetry 10 of the body 1 and cap 2 whose bearing against each other, in Figs. 1a, 2a with loosely applied lid and in Figs. 1b, 2b with cover clamped against the body, a clamping ring 3 serving as the clamping device.

Common to both designs of FIGS. 1 and 2 is the basic design of the cross-sectional shape of the cover, in particular the edge of the cover, and the upper region of the wall of the body 1 : when viewed from above, both the cover and the body are symmetrical with respect to the axis of symmetry 10 , which at the same time define the longitudinal direction, so that all-round closed containers are formed in that the only open side of the body can be sealed by the lid. As a rule, the body and lid are rotationally symmetrical.

The wall 7 of the body 1 is preferably smooth on the inside, for easier filling, emptying and cleaning of the inside of the container.

On the outside, set back from the freely ending body edge 1 a, the body has a circumferential ring flange 8 which projects radially outwards.

The body edge 1 a, that is to say the wall, in particular above the ring flange, can be made somewhat thicker than below the ring flange, but generally not thicker than 3 mm.

The cross section of the lid 2 in the radial region of the body edge 1 a is U-shaped or V-shaped with an annular groove 6 open at the bottom, that is to say in the direction of the body, with which the lid 2 can be placed on the body edge 1 .

Radially within this U-shaped or V-shaped groove area 2 c, the cover merges in one piece into its central area 2 d, which is thus lowered relative to the groove area 2 c. The radially outer leg of the groove area 2 c is either extended in the axial direction or obliquely outwards by means of a connecting area 2 b, at the lower outer free end of which the lid edge 2 a is in one piece. This is located in the axial direction in the attached state, thus still under the central area 2 d of the cover.

The lid edge 2 a has downwardly pointing, freely ending and likewise closed circumferential sealing webs 11 b, 11 c.

If the lid is clamped against the body, the seal should be made at two different sealing points 4 , 5 :

The free-ended body edge 1 a resting in the groove 6 of the lid represents the first sealing point 4. The sealing webs 11 b, 11 c of the lid edge 2 a resting on the top of the ring flange 8 of the body represent the second sealing point, which are caused by the concentric mutually extending sealing webs 11 b, 11 c is divided into two partial sealing points 5 a, 5 b.

The bracing takes place in that at the second sealing point 5, the respective facing away from the sealing point back sides, namely, the upward rear side 13 of the lid edge 2a and extending downward back side 14 of the flange 8 at an acute angle and extending from radially inward approach each other outward.

By pushing on a clamping ring 3 with a correspondingly conical clamping groove 19 , which is open to the radially inward, and is dimensioned such that it not only abuts when pushing inwards on the rear sides 13 , 14 of the lid edge 2 a and flange 8 , but this Pressed against each other in the axial direction, the bracing and sealing of the cover 2 with respect to the body 1 is achieved.

It is among other things important that the rim of the lid 2 a b with its sealing webs 11, 11 c in relatively stable is formed. The same applies to the groove area 2 c, which for this purpose can have a wall thickness which is at least doubled compared to the normal wall thickness, for example the central area 2 d, in particular in the area of the groove base, and moreover by an additional stabilizing extension 2 on the rear side of the groove, i.e. pointing upwards e has.

In contrast, the lid edge 2 a is quite movable with respect to the groove area 2 c, for example due to reduced material thickness in the course therebetween, in particular at the transition between the groove area 2 c and the connection area 2 b and the connection area 2 b and the lid edge 2 a.

As a result, for example, the lid edge 2 a can be pivoted slightly downward relative to the connection region or the entire connection region can be pivoted somewhat radially inward relative to the groove region.

It is also important that the body edge 1 a, in particular the entire piece of the wall 7 from the flange 8 to the free end, is sufficiently stable, and in particular the wall thickness is thicker than the rest of the wall 7 , and thus the body edge 1 a can be bent inwards or outwards at its free end in the radial direction, but only with relatively great effort.

The outwardly directed flange 8 is also very stable, and in particular is stabilized by webs 15 running radially outward on the underside.

The clamping ring 3 consists, for. B. made of metal or plastic, and its diameter can be reduced by tangentially applied clamping screws, lever locks or other of the known possibilities.

Figs. 1 and 2 differ in the relation of the following to be defined distances A and B, respectively at the lid and body:

These distances to be measured in the longitudinal direction, that is to say parallel to the axis of symmetry 10 , are defined as follows in the unstressed idle state of the body or cover: Distance A in the cover is the axial extent between the base of the groove 6 and the sealing bar 11 b projecting the furthest downward , 11 c of the lid edge 2 a.

Distance B in the body is the distance between the free upper end of the body edge 1 a and the upwardly facing sealing surface 12 b of the flange 8 .

While distance B can be seen slightly larger than distance A in FIG. 1, this is just different in FIG. 2a. These different relations and the resulting situations can be chosen deliberately or can arise due to manufacturing tolerances in the production of the cover or body, which is usually produced by injection molding.

If the lid spacing A is smaller than the body spacing B, as in FIG. 1 a, when the lid is loosely placed, its groove region 2 c sits on the free, upward-facing end of the body edge 1 a with a flank or the groove bottom of the groove 6 . b without the downwardly facing sealing webs 11, 11 2 c of the lid edge a is the upwardly facing, and generally at a right angle to the axis of symmetry 10 extending sealing surface 12 b of the flange 8 reach.

Provided that - due to differences in diameter - thereby the edge of the body 1 a is not the lid 2 is located in the groove bottom of the groove 6, but thereof radially inwardly or preferably outwardly spaced on one of the flanks of the groove 6 is applied, the distance between the edge of the lid 2 a and flange 8 may be even larger at the second sealing point 5 .

As shown in FIG. 1 a, the lower free ends of the concentrically circumferential sealing webs 11 b, 11 c are not at one level, but rather because of a slightly outward inclined position of the lid edge 2 a and also a slightly downward outward inclined position of the connecting area 2 b of the cover 2, the radially inner sealing web 11 b extends a little further to the sealing surface 12 .

By placing the clamping ring 3, that is radially Inward movement and thus application of 19 of the clamping ring 3, the tapered inner edges of the clamping groove at the facing of the clamping point 5 to the outside back sides 13 and 14 of the lid edge 2a and the flange 8 of the body 1 the lid edge 2 a, on the one hand, moves radially inward and, on the other hand, simultaneously and / or instead axially pressed against the sealing surface 12 b of the flange, that is, pressed downwards. This is due to the mobility of the lid edge 2 a with respect to the rest of the lid 2 , in particular with respect to the groove area 2 c, and in particular due to a bending or twisting of the individual parts of the lid to the transitions 17 and 18 on both sides of the wall, which are of lesser wall thickness Connection area 2 b.

Simply because of the radial inward movement of the lid edge 2 a and the approach of the transition region 2 b from the inclined position to the parallel position to the axial direction, at least one of the sealing webs 11 b, 11 c reaches the sealing surface 12 b of the flange 8 with its free end, whereby a seal is achieved at this second sealing point 5 . According to FIG. 1 b, the radially outer sealing web 11 c lies with its entire end face on the sealing surface 12 b, while the radially inner sealing web 11 b has only line contact with the sealing surface 11 b.

The axial movement of the lid rim 2 a groove 6, in particular the contact point on the flank against the edge of the body 1 a is also pressed against the first sealing body 4, and thus reached to the first sealing position 4 an increased tightness.

If, in addition, the sealing surface 12 b does not run perpendicular to the axis of symmetry 10 , but instead an increasing distance from the radially outside to the radially inside, the contact point possibly moving in the direction of the groove base and the edge 1 a being slightly radially deformed, from the upper free end of the body edge 1 a occupies due to an inclined position, as shown in dashed lines in Fig. 2b, this axial bracing effect is further reinforced.

In contrast, the distance A of the cover 2 is greater than the distance B of the cover 1 in FIG. 2a. When loose placing of the cover 2 is thus of the lid edge 2a on the sealing surface 12 b of the flange 8, and because of the weight of the lid will thereby the edge of the lid 2 a the transition 18 to the connecting portion 2b around a little bend, so that only the radially inner sealing rib 11 b rest and the radially outer sealing web 11 c of the sealing surface 12 b will be slightly lifted.

At the first sealing point 4 , the bottom of the groove 6 will not reach the free end of the edge of the lid 1 a, unless this is not aligned in the radial direction with the bottom of the groove, but is offset radially outwards or inwards and is therefore already on one of the flanks of the groove 6 .

By placing the clamping ring 3 from radially outside to radially inside, the lid edge 2 a is initially displaced radially inward along the sealing surface 12 b, and in addition also causes both sealing webs 11 b, 11 c of the lid edge 2 a on the sealing surface 12 b of the web 8 of the body 1 rest. By this displacement radially inwardly is also attached to the rim of the lid 2 a neighboring connecting portion 2b is displaced radially inwardly and thus causes the edge of the body 1 is present a at least at the radially outer flank of the groove 6, and first also in this sealing point 4 a seal occurs.

A further possibility, Figures 3a, 3b.:

. While was in the solutions of Figures 1 and 2, the wall thickness of the body rim 1 a considerably smaller than the width of the groove bottom of the groove 6 in the cover 2, this is reversed in the solution according to Fig. 3:

The wall thickness of the body edge 1 a, at least at its free end, is so large that it cannot penetrate into the groove 6 to such an extent that the bottom of the groove is reached.

The body edge 1 a is thus in loose attachment with its end region already on both flanks of the groove 6 , while the sealing webs 11 of the lid edge 2 a do not yet reach the sealing surface 12 b of the flange 8 . Only by pushing on of the clamping ring according to Fig. 3b, the lid rim 2 pulled a radially inward, but especially also in the axial direction downwardly onto the sealing surface 12 b on which now the sealing ridges 11b, abut 11 c. As a result of this axial bracing, the free end of the body edge 1 a is also pushed further into the groove 6 , and this is also widened slightly, depending on the stability of the groove area 2 c. This leads to a slight deformation of the central region 2 d of the cover on the radially inner side to a spherical shape, and on the radially outer side to an inclined position of the outer leg of the groove region 2 c and of the connecting region 2 b.

However, this is compensated for by radially inward displacement of the lid edge 2 a by the clamping ring 3 , and the existing possibility of movement of the lid edge relative to the groove area 2 c by the longitudinal extent of the connecting area 2 b and / or the mobility due to the thinned transitions 17 and / or 18 of the connecting area 2 b opposite the adjacent areas.

REFERENCE SIGN LIST

1

Body

1

a body edge

2

cover

2

a lid edge

2

b Connection area

2

c Groove area

2

d central area

2

e process

3rd

Tension ring

3rd

a groove

4

Sealing point
5a, b partial sealing point

6

Ring groove

7

Wall

8th

Ring flange

9

10th

Axis of symmetry
11a, b, c sealing web
12a, b sealing surface

13

back

14

back

15

Walkways

16

ground

17th

crossing

18th

crossing

19th

Spanut
A = cover distance
B = body distance

Claims (24)

1. Container with a body ( 1 ) and a lid ( 2 ) and a tensioning device for tightly tightening the lid ( 2 ) with respect to the body ( 1 ), characterized in that at least in the tensioned state, the lid ( 2 ) with respect to the body ( 1 ) lies tightly against at least two sealing points ( 4 , 5 ) which are spaced apart from one another and form a ring around the axis of symmetry ( 10 ) of the container. 2. Container according to claim 1, characterized in that the body ( 1 ) and the lid ( 2 ) each consist only of a single material, in particular plastic, in particular the same plastic. 3. Container according to one of the preceding claims, characterized in that the sealing points ( 4 ) and ( 5 ) are arranged axially spaced apart. 4. Container according to one of the preceding claims, characterized in that the sealing points ( 4 ) and / or ( 5 ) are divided into partial sealing points ( 5 a, 5 b). 5. Container according to one of the preceding claims, characterized in that at the sealing points ( 4 ) or ( 5 ) or the partial sealing points ( 5 a, 5 b) each have a sealing web ( 11 ) with its outer surface, in particular in the case of a line Touch, presses against a sealing surface ( 12 ) and can be moved along this sealing surface ( 12 ) due to the tensioning by means of the tensioning device. 6. Container according to one of the preceding claims, characterized in that at the first sealing point ( 4 ) the sealing web ( 11 a) is the freely ending body edge ( 1 a) and the sealing surface ( 12 a) is a V-shaped annular groove ( 6 ) in the underside of the cover ( 2 ). 7. Container according to one of the preceding claims, characterized in that at the sealing point ( 5 ) the sealing surface ( 12 ) is arranged transversely to the axis of symmetry ( 10 ), outside the wall ( 7 ) of the body ( 1 ) arranged on an annular surface radially is the externally facing ring flange ( 8 ) and the sealing web ( 11 b) is an annular circumferential sealing web formed in one piece with the outer lid edge ( 2 a). 8. A container according to claim 7, characterized in that the lid edge comprises two radially spaced, concentrically arranged sealing webs ( 11 b, 11 c) which rest on the same sealing surface ( 12 b) in the clamped state. 9. Container according to one of the preceding claims, characterized in that the lid edge ( 2 a), at least in the connecting region between the sealing webs ( 11 b, 11 c), is formed so stable that by clamping the Spannvorrich device no significant deviation from the ring shape of the lid edge ( 2 a) can be effected. 10. Container according to one of the preceding claims, characterized in that the sealing surface ( 12 b) extends perpendicular to the axis of symmetry ( 10 ). 11. Container according to one of the preceding claims, characterized in that the sealing surface ( 12 b) at an acute angle, in particular with a to the open end of the body ( 1 ) facing sealing surface ( 12 b), radially from the outside inwards to the bottom of the Body ( 1 ) sloping down, is arranged. 12. Container according to one of the preceding claims, characterized in that the lid ( 2 ) viewed in cross-section radially from the inside out from a plate-shaped central area ( 2 d), a U-shaped axially outwardly curved groove area ( 2 c), an adjoining at its radially outer free end, annular connecting area ( 2 b) and the adjoining lid edge ( 2 a), which are integrally formed with each other and wherein the transition between the connecting area ( 2 b) to at least one of the adjacent areas has a smaller wall thickness than the other areas. 13. Container according to one of the preceding claims, characterized in that the lid edge ( 2 a) is arranged radially outside the connection area ( 2 b). 14. Container according to one of the preceding claims, characterized in that the connecting region ( 2 b) extends axially. 15. Container according to one of the preceding claims, characterized in that the annular groove ( 6 ) has a semicircular groove base and the groove base is wider than the wall thickness of the body edge ( 1 a), which is also rounded. 16. Container according to one of the preceding claims, characterized in that the free end of the body edge ( 1 a) as a sealing web ( 11 a) of the first sealing point ( 4 ) from the sealing surface ( 12 b) of the second sealing point ( 5 ) an axial Distance takes up, which is slightly larger than in the relaxed state of the cover of the groove base of the annular groove ( 6 ) from the free end of the sealing web ( 11 ) or ( 11 b) and ( 11 c). 17. Container according to one of the preceding claims, characterized in that the diameter of the body ( 1 ), measured from the center of the wall to the center of the wall at the free end, ie at the edge of the body ( 1 a), deviates from the diameter of the annular groove ( 6 ) of the lid ( 2 ), measured from the center of the groove base to the center of the groove base, and the diameter of the body is preferably larger than the diameter of the ring groove ( 6 ), so that when the cover is placed without tension, the cover with its outer ring groove flank on the edge of the body ( 1 a) sits on. 18. Container according to one of the preceding claims, characterized in that the clamping device is a clamping ring ( 3 ) with a radially inwardly directed groove ( 3 a), the flanks of which move away from each other towards the free inner end. 19. Container according to one of the preceding claims, characterized in that the facing away from the flange (8) back side (13) of the lid edge (2 a) and pointing away from the cover back (14) of the flange (8) corresponding to the inner flanks of the annular groove ( 3 a) of the clamping ring ( 3 ) are conically shaped. 20. Container according to one of the preceding claims, characterized in that the conical rear side of the flange ( 8 ) of the body ( 1 ) is formed at least by webs ( 15 ) of the flange ( 8 ) which are distributed over the circumference. 21. Container according to one of the preceding claims, characterized in that the wall thickness of the body ( 1 ) at the body edge ( 1 a), in particular from the flange ( 8 ) to the free end, is greater than between the flange ( 8 ) and the bottom ( 16 ) of the body. 22. Container according to one of the preceding claims, characterized in that the annular groove ( 6 ) has an intermediate angle between its outer flank ( 6 a) and its inner flank ( 6 b) of 5-50 °, in particular 10-30 ° . 23. Container according to one of the preceding claims, characterized in that the annular groove ( 6 ) in the cover ( 2 ) has a groove base which is narrower than the wall thickness of the body edge ( 1 a) at the free end. 24. Container according to one of the preceding claims, characterized in that the connecting area ( 2 b) of the lid widens conically from the groove area ( 2 c) to the lid edge ( 2 a).