DE1187991B - Self-venting packaging - Google Patents

Description

Self-Venting Packaging The present invention relates to a packaging consisting of an open-topped container and a snap-in container elastic lid, with an inwardly protruding, arranged in the container wall, annularly over the circumference of the container wall extending indentation and an im Lid edge arranged, protruding outward, ring-shaped over the circumference of the lid running projection, which when the lid is pressed in behind the retraction in the container wall engages and thus the upper limit against being pushed out of the Lid forms.

There is already a fresh-keeping pack in can form known, whose cover has an outer bead in its inclined edge, which is behind a corresponding inwardly protruding bead on the upper edge of the container engages when the lid is pressed in. A thermoplastic adhesive is also used to seal the lid the can body provided.

It is also a packaging container with a lid made of thin plastic film became known, in which also corresponding bulges in the container edge and are provided in the lid. Finally, there is packaging for edible fat, too made of plastic film, with a sunk-in lid became known.

Furthermore, a container closure is made of an elastically resilient and stretchable plastic has become known, which makes the opening of a container gas-tight locks.

These known containers or closures are in many cases suitable for packaging food. In other cases, however, join the known containers have difficulties when the food to be packaged, such as soft cheese, develop gases after closing the container. The known containers or packaging now allow due to the gas-tight seal not the escape of such gases developed inside the packaged goods.

Rather, there is an internal overpressure in such known containers developed that bulges up the bottom of the lid and possibly even cracks open the container or lifting the lid.

The invention is now based on the object of a packaging to create the aforementioned type, which it with the formation of gases with a corresponding Overpressure inside the sealed container allows these gases to flow between the container wall and the lid escape without that the lid is out of his depressed position is removed. According to the invention it is provided that the annular Retraction in the container wall and / or the annular projection on the lid edge with one or more passage channels distributed over the circumference for in the container resulting gases od. The like. Are provided and also during the escape of the gases are captively locked together. Such a packaging according to the invention enables the formation of gases with a corresponding overpressure that this Gases between the container wall and the lid escape as soon as there is under the Effect of the internal overpressure of the elastic push-in cover like a membrane from the inside bulges outwards. With this arching up of the lid base, the am pushes itself Cover provided counter surface from the sealing surface in the container wall and offers so that the gases have a free path to the outside.

The invention makes a hygienically perfect, economical one manufacturable and resistant packaging created in which the container is sealed by the lid, which on the other hand allows gas to escape, without the lid being lifted off the container. The lid is still from the consumer easily removable.

According to the invention it is also provided that the packaging with an annular protective edge that overlaps the upper edge of the container wall of the cover is provided above the projection serving as a support bearing and that this protective edge from the encompassed part of the upper edge of the container everywhere the distance ensuring the free passage of gases escaping from the container having.

This will keep the contents of the container in check, even if it escapes occasionally of gases, hygienically covered and sealed from the environment.

It is preferably provided that for all-round safe compliance the distance between the overlapping protective edge of the lid and the encompassed Part of the container edge on at least one of these two parts several over the Circumferentially distributed, projecting towards the upper part of the nose are provided. These lugs preferably simultaneously form a stop for the cover Press it into the container.

Furthermore, it is proposed according to the invention that the sealing surface a practically radially extending annular surface and the opposing surface in the container jacket on the cover a likewise practically radially extending annular surface at the lower end the edge of the lid is. The ring surface serving as a counter surface can be the outer one Form part of the lid base. But there can also be one below the first sealing surface subsequent, practically cylindrical second sealing surface in the container jacket and one that interacts with this and directly adjoins the first opposing surface subsequent, practically cylindrical counter surface in the lid, just above the Lid base, be provided, which pivots inward when the lid base arches upwards stands out from the first sealing surface.

Finally, one above the first sealing surface can also be used, however below the support bearing formed by the retraction, a second sealing surface and a corresponding, cooperating with this second mating surface is arranged be, with at least one of these two additional sealing surfaces practical runs cylindrically.

Finally, it is proposed according to the invention that the sealing surface in the container is a practically cylindrical part of the container jacket, while the counter surface interacting therewith by an annular circumferential, roughly radial Extension of the bottom of the lid protruding outward beyond the edge of the lid above it Protrusion is formed.

The embodiments of the packaging proposed according to the invention permit easy and therefore economical and cheap production. Such packaging is flawless from a hygienic point of view and has a sufficiently long service life.

The invention is illustrated below with reference to the drawing in exemplary embodiments explained in more detail.

F i g. 1 is a perspective view of a container with attached lid with the features of the present invention, partly in section, F i g. 2 shows the view of several lids nested together before they are put on the containers, F i g. 3 shows a section through part of a cover according to FIG. 2 in larger scale in perspective view, FIG. 4 a through a partial section the container and the attached lid; the container is in the state shown tightly closed by the cover, FIG. 4b shows a partial section corresponding to FIG. 4a; in the state shown, the container is not tightly closed by the lid, but this allows gases that have arisen in the can to escape, Fig. 4c shows a partial section through two interconnected covers according to FIGS. 1 to 4b on a larger scale, FIG. 5 shows another embodiment of the cover in perspective Illustration, FIG. 5 a shows a section through the cover according to FIG. 5 and a part of the container; in the state shown, the can is tight due to the lid closed, F i g. 5b shows a section corresponding to FIG. 5 a; in the illustrated State, the lid allows gases to escape, FIG. 6 a further embodiment present invention; it is a kinematic reverse of that shown in FIG. 1 shown Embodiment, FIG. 6 a a section through the lid and the container according to Fig. 6; in the state shown, the container is tight due to the lid closed, F i g. 6 b one of the F i g. 6 a corresponding section; in the illustrated State, the lid allows gases to escape, FIG. 7 a partial section by a further embodiment; the container is in the state shown tightly closed by the lid, FIG. 7 a one of the F i g. 7 corresponding Cut; In the state shown, the lid allows gases to escape, 8 shows a partial section through a further embodiment; in the illustrated State the container is tightly closed by the lid, Fig. 8 a one of the F i g. 8 corresponding section; in the state shown allows the lid the escape of gases.

In Fig. 1 is a can 10, consisting of the container 12 and the Lid 14 is shown. The lid is placed on the container. As can be seen the container is made in one piece from plastic. It has a conical shape Side wall 16 which is integrally connected to the bottom 18. The top edge the side wall forms the container opening. Near the top of the The container is a circumferential groove 20 in the side wall beaded through from the inside out 16 arranged. The groove 20 is formed by a lower shoulder 22 and an upper shoulder Paragraph 24 limited. As can be seen from Fig. 4 a, the groove is through the more or less perpendicular side wall area 26 a small distance from the upper Distanced container edge. The upper edge of the container 12 is designed as an annular bead 28. The paragraphs 22 and 24 are opposite each other and act in a yet to be described Way with corresponding areas of the lid 14 together.

The lid 14 has a flat bottom region 30, which the container opening locks. A small piece of the perimeter of the flat area 30 removed an upwardly beaded reinforcing and stacking rib 32 is arranged. in the In cross-section, this rib shows an asymmetrical curve shape. The steep one The branch of the curve is numbered 34 and the flatter branch of the curve is numbered 36. the Rib 32 serves on the one hand to reinforce the relatively large and thin-walled flat floor area 30 and on the other hand for centering the floor 18 of an overlying Can when several cans are stacked on top of one another.

However, this latter feature does not belong within the scope of this invention.

The steeply rising curve branch 34 prevents the floor of the overlying one Can to slide over the rib 32, and thus increases the stability of the stacked cans.

As best seen in FIG. 3 can be seen, follows the flat bottom area 30 of the lid is an upwardly widening short conical Area 40, which thus forms the end of the flat floor area 30. The dem conical area 40 directly adjacent edge of the flat bottom area 30 (indicated by arrow 38) serves as a seat or sealing surface and acts with the lower shoulder 22 of the groove of the container 12 together. From Fig. 4 a is lying on top of one another to recognize the sealing surfaces. A closes inwardly on the area 40 of the lid sharply receding conical area 42. This is, as shown in Fig. 3, 4 a and 4b can be seen, with a plurality of smaller ones lying close together Knobs 44 equipped. The knobs 44 are the upper paragraph 24 of the groove of the Container. On the one hand, they form the supports for the one that is locked into the container Lid and on the other hand have the task of removing the surface of the paragraph 24 from the Surface of the area 42 of the lid to be sufficiently distanced to allow the exit of gases that develop in the container is made possible.

Furthermore, they form a fulcrum when the areas 38 and 40 of the lid is relative to the lower shoulder 22 of the groove of the container with stronger Bulge gas development upwards. Due to the curvature of areas 38 and 40 the gases can escape, as can be seen from FIG. 4b.

As in particular from FIG. 4b can be seen, follows the Area 42 of the lid is another, also inclined inward or in the direction upwardly conically converging area 46. The angle formed by a surface line this area forms to the vertical, is however much smaller than the corresponding one Angle of the area 42. Of the vertical or cylindrical area 50 is the Area 42 set off by step 48. The step width is chosen so large that the step edge when several lids are nested together on the adjacent lid comes to the plant. This is from FIGS. 2 and 4 c can be seen.

The vertical or cylindrical area 50 of the lid has a A plurality of raised ribs 52 arranged on its outer surface. Ribs 52 prevent unwanted sealing of the container area 26 by the cover area 50. At the top of the cylindrical area 50 of the lid it is conical expanding area 54.

This is followed by the one provided for hygienic reasons, the edge region 56 of the lid covering the container edge. As from the Fig. 4 a and 4b, the edge region 56 of the lid covers the bead ring 28 of the container although it is protective, it is a little distant from it. Which Conically widening area 54 of the lid on the one hand causes a centering, when several lids are nested together, and on the other hand acts with the lower edges 58 of the ribs 52 located at the step 48, as best shown in FIG G. 4 c can be seen together.

The stack of several lids nested together looks like one Spring, because the lower edges 58 of the ribs 52 when the stack is compressed experience elastic deformation. The stored spring work prevents jamming the lid and ensures reliable removal of the individual lid Packaging machines.

The lids to be placed on the containers generally arrive when nested together for shipping. This is especially true when the lids manufactured and stored separately and then after filling the container with Can be placed on top of this with the help of machines. For this purpose the magazine the packaging machine is filled with stacks of suitable size. Become out of the magazine the lids are removed individually by means of a removal device and placed on the filled ones Container put on. The removal device must necessarily work at a high speed operate. Therefore, it is necessary that the individual lids easily separate from the stack so that the work cycle is not disturbed by jamming.

Separating the individual lids from the stack is not a problem, if it is a cover with a greater wall thickness. However, if thin-walled, z. B. made of plastic cover with a wall thickness of less than 0.9 mm is used, it has been shown that only the spring action of the area 54 elastically compressed rib edges 58 jamming of the individual covers prevents a stack and enables an effortless detachment of individual lids. The rib edges 58 act as elastic intermediate layers that prevent, for example shocks occurring when shipping the stack, jamming of one or more Result in a lid of the stack.

If the container 12 z. B. filled with soft cheese and the lid 14 on top, gaseous ones develop as a result of the ongoing biological processes Products. In addition, a certain amount of air is trapped when the lid is put on been.

After a while, well-known lids would appear as a result of being under the influence of temperature fluctuations expanding enclosed air and / or blown off by the gas evolution caused pressure increase or at least from Container are lifted off. For this reason it is desirable that those in question upright plastic containers are equipped with a ventilation device, which allows gases to escape from the inside of the container, but otherwise allows a tight and hygienically perfect closure of the container.

When the gas pressure reaches the fairly large bottom area 30 of the lid applied, this is, as can be seen from Fig. 4b, bent upwards, so that the sealing surface 38 lifted from the shoulder 22 of the groove provided in the container wall will.

The knobs 44 form the fulcrum for the pivoting ones Areas 38 and 40 of the lid. The gas escapes through the cavities between the Knob 44 is thus released.

The gases then sweep along the area 26 of the container and pass between the bead ring of the container and the area 56 of the lid into the open. The ribs 52 prevent that between the container area 26 and the opposite areas of the cover a second, unwanted sealing surface forms. In the absence of ribs, such sealing surfaces may develop. This possibility is given in particular when filling the food a thin film of liquid, e.g. B. from milk, cream or the like. On the areas in question is created. Such a liquid film can also then produce a sealing effect if the cover dimensions are chosen so that a contact of opposing surfaces in and of itself is not possible. The arrangement of the ribs 52 also prevents an undesired sealing effect Dimensional fluctuations of the lid and container.

Another embodiment is present in FIGS. 5, 5a and 5b Invention shown.

Corresponding details are given the same reference symbols and the Index a numbered.

The in F i g. 5 a illustrated embodiment differs from the previous one mainly in that it has second sealing surfaces.

It is also suitable for use on such packaging machines where a lid is not through a vertical movement, but through a horizontal movement is removed from the stack. The second sealing surfaces are clear from FIG. 5 a can be seen. Closes to area 30a of the lid a vertical area 60 to which the narrow horizontal area is located 62 connects. This in turn is followed by a short, approximately vertical area 64 at. The latter, measured in the axial direction, is considerably shorter than the range 60. The area 60 of the lid lies sealingly against the upper area of the container side wall 16a. The area 62 of the lid lies sealingly against the area 22a of the container at. A double seal is thus achieved, with the sealing surfaces relative to one another stand vertically. The can is vented, as shown in FIG. Sb can be seen, in the same way as in the previous embodiment. The embodiment of the Container 12 a and the lid 14 a is advantageous if the lid is made of plastic and the container is made of paper. Then the surface finish offers the groove 22a may not guarantee proper sealing from. In the case of paper containers, it is relatively easier to remove the upper area of the side wall 16 a of the container with a smooth surface and this as a sealing surface to use. The cover 14 a require closer manufacturing tolerances than those in F i g. 3 illustrated cover 14. When using existing plastic Containers is therefore the lids 14 of preference for manufacturing reasons admit. All lids shown are good for use in packaging vending machines suitable. For removing individual lids that are nested together to form a stack There are two basic types from the magazine in such automatic packaging machines known from removal or feeder devices. For one type, the bottom will be Lid separated from the stack by a vertical movement. For this Type of cover 14 shown in Figure 3 is particularly suitable. Apart from this allow the lids 14 a more complete nesting than such lids, which can be released from the stack by a horizontal movement.

Automatic packaging machines with a horizontally acting removal device however, they are also used for the lids. For such packaging machines the lid shown in FIGS. 5, 5 a and 5 b is determined.

As I said, the lowest in such packaging machines Cover by a laterally directed, essentially horizontal movement of detached from the stack. To the required relative displacement superposed To enable cover, a shoulder 48a is provided in the upper area of the cover 14a, which directly adjoins the lower end of the conical region 54 a.

When several lids are stacked together, the one on top is used Cover on the paragraph 48a to the plant. The bottom cover can therefore by a side directed movement can be removed from the stack, the area 54a as a sliding surface serves. The ribs 52 a, which prevent unwanted sealing, are in this Embodiment indented in the area 54 a. The ribs can, as in FIG. 5 relatively short, depending on the selected dimensions, but also over the whole Area 54a and be guided over the area 56a overlapping the container edge.

The embodiment shown in FIGS. 6, 6 a and 6 b represents essentially a kinematic reversal of the two embodiments described above Corresponding details are given with corresponding reference symbols and the index b numbered.

In the embodiment 10b, these are the knobs 44 and the ribs 52 of the previous embodiments, equivalent elements are provided on the container 12 b and numbered 68 and 70. With paper containers it is not possible to use the knobs 68 and to form the ribs 70 in the required sharpness. With containers off Plastic, e.g. B. polystyrene, but this is easily possible. As from F i G. 6 a and 6b can be seen, the knobs 68 and the ribs 70 serve the same purpose like the knobs 44 and ribs 55 of the cover 14.

In Fig. 7 is another embodiment of the present invention shown. It largely corresponds to the embodiments shown in FIGS. Corresponding details are numbered with the same reference symbols and the index c.

The in F i g. 7 embodiment shown is double sealed, without the corresponding cover area being additionally set off. The container 12 c has a peculiar paragraph formed from areas 74 and 76, which is arranged immediately below the groove 20c. The re-entrant area 72 of the container 12c immediately below the groove 20c cooperates with the side wall 78 of the lid 14 c together, whereby the first sealing area is created. The second seal is where the container shoulder 76 meets the lid area 38 c is present. As shown in FIG. 7 a shows the mode of operation of this embodiment the same as that of the above-described embodiments.

The in F i g. 8 shown embodiment has a single line-shaped Sealing on. This embodiment is well suited for plastic lids and Paper containers. Corresponding details are given the same reference symbols and numbered by the index d. The cover 14d has where its bottom area 30d and its side wall region 78 d adjoin one another, a sharp projection 80. The projection 80 acts with the side wall 16 d of the container below the groove 20 d together. As already stated, with paper containers it is easier to a smooth-walled, tolerance-accurate side wall as a groove with a corresponding Generate surface texture.

In the present embodiment, therefore, a good seal is achieved achieved, wherein the lid performs the same functions as in the previous embodiments. In the embodiment 10 d, the cover is designed so that its bottom area in the attached state, as shown in FIG. 8 can be seen, slightly arched upwards is.

As a result, the projection 80 is counteracted with a certain bias the side wall 6d of the container pressed.

Claims (9)

Claims: 1. Packaging, consisting of an open top Container and an elastic lid that can be snapped into it, with one in the container wall arranged, inwardly protruding, annularly extending over the circumference of the container wall Indentation and an outwardly protruding, annular over, arranged in the edge of the lid the circumference of the lid extending projection, which is behind when the lid is pressed in the retraction engages in the container wall and thus the upper limit against a Pressing out the cover forms, characterized in that the annular recess (24) and / or the annular projection (42) with one or more over the circumference distributed passage channels for gases produced in the container or the like. Provided are locked together and cannot be lost while the gases are escaping are. 2. Packaging according to claim 1 with a top edge of the container wall overlapping annular protective edge of the lid, characterized in that the overlapping protective edge (54, 56) above the projection serving as a support bearing (42) is arranged and from the encompassed part (28) of the upper container edge Free passage everywhere gases escaping from the container or the like Has distance. 3. Packaging according to claim 2, characterized in that the all-round safe maintenance of a distance between the overlapping protective edge of the cover and the encompassed part of the container edge on at least one of these two parts several lugs distributed over the circumference, protruding towards the upper part (52, 70) are provided. 4. Packaging according to claim 3, characterized in that the noses (52 d) at the same time a stop for the cover when it is pressed into the Represent containers. 5. Packaging according to claim 1 to 4, characterized in that the sealing surface in the container jacket has a practically radially extending annular surface (22) and the mating surface on the cover also has a practically radially extending annular surface (38) is at the lower end of the lid edge. 6. Packaging according to claim 5, characterized in that the as Counter surface serving ring surface forms the outer part of the lid base. 7. Packaging according to claim 5, characterized by a down below the first sealing surface (22a) adjoining the second practically cylindrical Sealing surface (16a) in the container jacket and a cooperating with this, directly practically cylindrical mating surface adjoining the first mating surface (62) (60) in the lid, just above the lid base (30a), when the lid base arches upwards pivots inward and thus stands out from the second sealing surface (16 a). 8. Packaging according to claim 5, characterized by an above the first sealing surface (74), but below that formed by the retraction Support bearing arranged second sealing surface (72) and a corresponding one with this cooperating second counter surface (78), at least one of these two in addition sealing surfaces is practically cylindrical. 9. Packaging according to claim 4, characterized in that the sealing surface in the container is a practically cylindrical part of the container jacket (16d), while the counter surface interacting with it by a ring-shaped circumferential, for example in a radial extension of the cover base (30d) outwards over the overlying one Lid edge (78 d) protruding projection (80) is formed. ~~~~~~~ Considered Drawn pamphlets: German utility model No. 1 685475, 1736073, 1751979; German patent specification No. 829 248.