DE4418141A1 - Fitted-together covering lid and its attachment on food containers by means of wrapping, vacuum and cohesion - Google Patents

Abstract

The fitted-together covering lid and its attachment on food containers by wrapping, vacuum and cohesion serves to close in particular packages for dairy products which have to be packaged so that they remain fresh for a long time and which should have a refittable closure in order to be able to use the contents in portions. Furthermore, for reasons of reducing the migration of pollutants into the contents of the package when the latter is closed, a novel method is used, called: "controlled diffusion using novel compounds". <IMAGE>

Description

Technical field

Slip-on lids are used for solid, liquid and gaseous substances separate from the outside in a container.

This is done by placing it on the edge of a container and if necessary, hold on to it with a vacuum in the container. Solutions are also known in which the lid with the container un is releasably connected.

State of the art

So far no slip lid is known, in which a controlled Diffusion of material particles from the slip lid into the edge of the loading case, when the edge of the container is cold, a gas or liquid tightness Connection arises that with the usual transport and storage conditions remain tight for years, for example.

Here, the invention seeks to remedy diffusion and thus Cohesion between the slip lid and the container in the manner according to the invention to enable and the until now common welding process because of the resulting decay products, if poly is used meren to replace.

Description of the invention

The composite slip lid ( 1 ) / ( 2 ) is made according to the claims of this application, assembled and attached to the Ge vessel ( 3 ) and consists of lid ( 1 ) and the label ( 2 ), ( Fig. 1 to 3) . Furthermore, the starting material for the composite slip lid and here in particular for the lid ( 1 ) according to the above-mentioned methods and the materials used, their connection by the controlled diffusion according to the invention using diffusion-controlling embedding bodies in the surface of at least one of those to be added by cohesion Parts of the assembled slip lid and the vessel to be covered.

The production of the starting material (s) for the assembled slip lid is partly carried out according to the procedure mentioned in the application PCT / DE90 / 00891 and with the devices mentioned therein. The placement process of the assembled slip lid and the subsequent cohesion of the same with the vessel partly according to PCT / EP92 / 01181 and P 42 36 052.8 and the utility model G 93 07 844.7 from May 26, 1993. In one of the two composite slip lid shown as an example of the subject matter of the invention ( Fig. 1 and Fig. 3), the label ( 2 ) over the end of the lid ( 1 '''''') on the outer edge of the same and grips the vessel ( 3 ) with its part of the vessel rim ( 3 ') constricted ( 2 '). As a result, the edge of the lid ( 1 '''''') is drawn to the outer edge of the vessel and thus seals the vessel from the outside.

The lid edge ( 1 '''''') is cohesively connected to the label ( 2 ) and this only until the lid section ( 1 ''') to be located towards the upper edge of the vessel begins. This lid section is only adhesive on the edge of the vessel ( 3 '). Due to the connection of the lid ( 1 ) and label ( 2 ) by diffusion after putting on the assembled slip lid or by welding at this point before putting it on the vessel ( 3 ), this only acts as an adhesive cover part ( 1 ''' ) as a tensile element on the edge of the label ( 2 ') when putting the assembled slip lid on the vessel ( 3 ).

This is also the case after removing the assembled slip lid and putting it back on the vessel ( 3 ).

An otherwise necessary cover with a film by welding the same container closed on the container is saved, which leads to Cheaper packaging.

Also, the seal is much better than an overcap to be joined only approximately with the vessel, since the lid ( 1 ) of the slip lid to be assembled retains its elasticity after the vessel ( 3 ) has been removed and encloses the vessel rim ( 3 ') at least in a liquid-tight manner.

In this version of a composite slip lid is put on the same, using compressed air, the lid inner part ( 1 '), ( 1 '') placed on the vessel wall. The inner lid part ( 1 '''') will, depending on the applied pressure, partially or entirely occupy the space between the packaged food and the container ( 3 ) ( Fig. 1) and thus a more or less strong breathing of the food through the lid ( 1 ) enable, which is so thin that it acts as a membrane for a gas exchange between food and the outside atmosphere.

The openings in the label ( 2 '') or a porous label material allow or allow such gas exchange.

The openings in the outer edge of the label ( 2 '''''') allow the blowing in of heated air, for example, to start the diffusion between the heated lid ( 1 ), the label ( 2 ) and the cold edge of the container ( 3 ') and / or keep going. The openings are so small that no dust or moisture can penetrate through them. It is vented when blowing in, for example, heated air between the label and the lid via the openings in the label ( 2 '') and, if appropriate, between the outside of the label and the outer edge of the lid ( 1 '''''').

The wall thickness of the lid ( 1 ) is only a few tenths of a millimeter due to the material expenditure and a short heating time to the diffusion start temperature (approximately between 120 and 180 degrees Celsius when using ethylene-butylene-poly styrene-Ccmpound with about 30 Shore A at the start of the diffusion process) thick. The shape of the slip lid is mainly obtained by joining with the label ( 2 ), which in this embodiment is made in particular of polypropylene film and also has a thickness of a tenth of a millimeter.

Another version of the assembled slip lid ( 1 ) / ( 2 ) ver combines the advantages of previously welded foil lid made of coated aluminum with the advantages of fastening the novel lid ( 1 ) and its connection to the label ( 2 ) when the lid is connected at lower temperatures than necessary for pressure welding. Re-attachability of the lid ( 1 ) after its removal from the vessel ( 3 ) and holding it with the help of the groove ( 3 ''') in the edge of the vessel ( 3 ').

With this design of a composite slip lid, a liquid-tight seal of the container ( 3 ) is achieved, which, however, with a perforated aluminum foil label, for example, regulates gas exchange between inside and outside the food package, here with a package for a milk product ( 3 ′ ′ ′), ( Fig. 1), ( Fig. 2) - allows.

The lid ( 1 ) is only a few tenths of a millimeter thick and encloses the label ( 2 ) at its edge ( 2 ') so that a skin-friendly feeling when removing the lid ( 1 ) is created by the favorable Reibverver ratios between lid material and skin.

The / the rag ( 2 '''') is / are also coated with the lid material. In the experiment it has been shown that the cohesion to be reached at about 150 degrees Celsius between the aluminum foil provided with an adhesive layer and the compound of ethylene-butylene-polystyrene is far below half the values for the cohesion between this compound and polypropylene for the same Temperature.

In order to prevent the label from aluminum foil being peeled off and peeling off the assembled slip lid ( 1 ) / 2 ) and the lid remaining firmly on the polypropylene vessel ( 3 ), the novel controlled diffusion process for this compound was primarily and developed for preferably polypropylene as the material to be connected with it.

In the lid material ( 6 ), ( Fig. 5) is fine wheat flour or a mixture of Zn calcium salt, cellulose sodium and polysaccharide or any other mixture of food-safe ingredients with a heat resistance up to about 190 degrees Celsius and the property itself self active with an aqueous solution to bind to an adhesive compound as material for the in / co-ordinate bodies in the surface / n ( 7 ) These diffusion-controlling embedding bodies are in such a number per unit area in the surface of the cover made of ethylene-butylene-styrene on one side or introduced on both sides that a cohesive force determined in the test at a given diffusion process - according to temperature, contact pressure of the parts to be connected and the diffusion time - in a controlled and regulated process when connecting the cover ( 1 ) or the assembled slip cover ( 1 ) / ( 2 ) with the polypropylene vessel or the mi t polypropylene coated vessel edge ( 3 ') reached and not significantly exceeded.

The proportions of the diffusion-controlling embedding bodies, which are water-soluble, are used for the adhesive reclosing of the opened food pack in this lid design, since the clipping of the very low lid rim ( 1 '''''') into the groove ( 3 '''), at the edge of the vessel ( 3 ') all around, alone does not result in a liquid-tight seal.

Brief description of the drawings

Figs. 1 to 5 show the guides off of packs of composite inverted trays. Furthermore, the vessels made of polymer (s) ( 3 ) are shown in section together with the fitted slip covers according to claims 1 to 10; the contents of the vessel ( 3 ′ ′ ′ ′) are drawn in dashed lines.

The dash-dotted inner part of the assembled slip lid ( 1 ) / ( 2 ) - ( 1 '''') - is on the food surface. The extended inner part ( 1 '''') is drawn up to the food surface as a stress parabola. With ( 2 ) the label edge is designated. ( 1 ''''') has the imaginary central axis of the pack as a label.

The combination pack ( Fig. 2), (sheet 1/3 ) is used in the packaging of milk products. It has a predetermined breaking point ( 3 '') between the individual packs on the facing outer edge of the vessels ( 3 ). ( 2 ''') is the name for the / the tabs on the lid ( 1 ), ( Fig. 4).

The lid ( 1 ) sits with the inner part ( 1 ''') by pressure / negative pressure on a vessel made of polymer, the inner lid part of the vessel ( 3 ) being deformed and on the inside of the vessel with its part ( 1 '), ( 1 '') Lies on and so forms an additional seal, ( Fig. 3) / ( Fig. 4), ( Fig. 1). The force arrows are labeled "F", which indicate how the inner part is deformed by the applied positive or negative overpressure to the vessel (s) ( 3 ).

The opposing vectors on the inner lid part ( 1 '''') show the direction of movement of the lid to be elastically deformed at this point from the highly elastic ethylene-butylene-polystyrene compound. On the constricted edge ( 2 ') of the label made of polymer, a force arrow (F) is drawn, which shows how the label presses on the edge of the container ( 3 ') and pulls the lid with a component thereof onto the edge. The force arrow marked (F) on the upper edge of the label shows how the lid section ( 1 '''''') is attached by diffusion or pressure welding, shows a pull of the lid part ( 1 '' loosely resting on the rim of the vessel ( 3 ') ') at. With ( 2 '') and ( 2 '''''') are small openings in the label that allow the exposure to compressed air, or respectively compressed air / heated gas / liquid.

Fig. 4 on sheet 2/3 shows an embodiment of the composite slip lid ( 1 ) / ( 2 ) as it is formed when using coated aluminum foil ( 4 ), ( 5 ), ( Fig. 5) for the label ( 2 ) is. The cover ( 1 ) in this embodiment is also made of ethylene-butylene-polystyrene compound ( 6 ), ( Fig. 5), (sheet 3/3 ) and with an inserted diffusion-controlling storage body ( 7 ), ( Fig. 5, sheet 3/3 ) provided, which are inserted in the lid surface opposite the polypropylene / polypropylene coating ( 3 ′) or hang loosely on the surface. The opening in the upper part of the label edge ( 2 '''''') serves for loading the label / the lid with compressed air, which can also be heated, to start and hold the diffusion process between the lid ( 1 ) and the rim of the vessel ( 3 ' ) and possibly label margin ( 2 ').

With ( 1/2 '''') the undeformed tab on the assembled slip lid is designated and with ( 1/2 ''''') the deformed tab around the rim of the vessel ( 3 ') made of label and lid material ( 4th ), ( 5 ), ( 6 ) and ( 7 ) be standing.

With ( 3 ''') is the circumferential groove around the edge of the vessel, in which the lid ( 1 ) with its lid edge ( 1 '''''') is clipped.

The vessel is identified by ( 3 ).

The structure of the assembled slip lid with respect to the materials ( Fig. 5), ( 1 ... 7 ), placed on the vessel ( 3 ) or the vessel edge ( 3 '), is selected so that an easy removal of the lid is possible . The label material in polymer (s) and also a possible label made of aluminum are designated by ( 4 ).

In the case of a label made of aluminum, the then required coating of the aluminum foil is denoted by ( 5 ).

Claims (10)

1.Composed slip lid ( 1 ) / 2 ) and its attachment to food containers by wrapping, vacuum and cohesion according to patent applications PCT / EP92 / 01181, PCT / DE90 / 00891 and P 42 36 052.8 from October 26, 1992, which has a vessel rim ( 3rd ') With a sealing lip ( 1 '''''') comprises according to the system "mandrel" of a "hose around loops", according to the utility model G 91 07 332.4 U, and by a negative pressure and by cohesion / adhesion Seals vessel ( 3 ) to the outside, characterized in that it consists of a lid ( 1 ) and a label ( 2 ) which, in their interaction, provide the necessary stiffness of the assembled slip lid ( 1 ) / ( 2 ) when the same is put on and the Pull off or put back on / from / to a vessel ( 3 ) and by a negative overpressure that can be generated with it in the food container and possibly a controlled gas exchange, due to the Ver think of it as an osmotic membrane and through the cohesive connection of the lid edge ( 1 '), ( 1 ''), ( 1 '''''') with the vessel edge ( 3 '). be or the edges of it by a controlled diffusion with the aid of diffusion-controlling embedding bodies ( 7 ) in the lid material ( 6 ) according to temperature, pressure on the parts to be joined and time of the diffusion process, the polymer / polymers sufficient / sufficient or polymer-coated metal foils . 2. Composite slip lid ( 1 ) / ( 2 ) according to claim 1, characterized in that it is originality-securing and leakage, or opening of the container ( 1 ) / ( 2 ) / ( 3 ) by deformation of its shape and by a hiss and / or indicates snap sound. 3. Composite slip lid according to one or both of claims 1 and 2, characterized in that the lid ( 1 ) alone or with the label ( 2 ) together when placed on the vessel and loaded with a force (F), together with the vessel ( 3 ) acts as a vacuum pump. 4. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 3, characterized in that the lid ( 1 ) alone or together with the label ( 2 ) as a control membrane for a controlled, automatic gas exchange between the outside and running inside as well as vice versa works. 5. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 4, characterized in that the inner part ( 1 '''') of the lid ( 1 ) of the vessel ( 3 ) is deformable to a large extent and with its cylindrical part ( 1 ''), or with its wall ( 1 ') can be sealingly applied to the inner wall of the vessel ( 3 ) by a compressive force (F). 6. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 5, characterized in that the label ( 2 ) on its outer edge with the lid edge ( 1 '''''') is cohesively connected and forms a spring element with it ( Fig. 3), ( Fig. 4). 7. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 6, characterized in that the lid ( 1 ) in a groove ( 3 ''') around the entire rim of the vessel with its sealing lip ( 1 '''''') Engages and the cover piece between the outer edge of the label and since from its cohesive connection point only loosely or adhesively rests on the inside of the container on the edge of the container on its upper side ( 3 ') and a force (F) on the outer edge of the label ( 2nd ') Exercises. 8. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 7, characterized in that one / more rags ( 1/2 ''''') from the label material ( 4 ) / ( 5 ) and Lid material ( 6 ) is / are attached to it. 9. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 8, characterized in that an ethylene-butylene-polystyrene compound with an initial Shore hardness A between about 30 and 95 is used as the lid material ( 6 ) and in one or both surfaces of this primary material / shaped piece, diffusion-controlling storage bodies ( 7 ) in a distribution which has previously been tested before incorporation / pollination and is held by a regulation / control during their application as an area proportion of their total in relation to the lid top treated with it - Area / areas, these embedding bodies made of fine grain flour, in particular wheat flour, but also other materials such as a mixture of zinc-calcium salt, cellulose sodium and polysaccharide, are / are suitable for this. 10. Composite slip lid ( 1 ) / ( 2 ) according to one or more of claims 1 to 9, characterized in that the label ( 2 ) consists of polypropylene or coated aluminum ( 4 ), ( 5 ).