DE102006036137A1 - packaging container - Google Patents

Abstract

It is proposed a packaging container in the form of a container for food and luxury food and a method for its preparation. The packaging container contains a circular cylindrical shell made of a heat-sealable material, in particular polypropylene, which is produced from a rectangular blank and has a longitudinal seam. In the one end of the envelope formed thereby a bottom is welded at a distance from the corresponding end edge. On the opposite side, first a ring and within the ring a lid with a cylindrical shell portion is welded. The attachment of the lid with his ring is of course only after filling the can with the provided stimulant.
In order to maintain the stability of the can even at elevated pressure, a pressure relief valve is arranged in the bottom, which opens at about 60 to 80 mbar.

Description

The The invention relates to a packaging container for food and beverages serving tin.

Packaging container of this Sort have a multiple task. You should, of course, the Protect food or foodstuffs against external influences, so that their properties also have a longer Period unchanged maintained. Which also includes, that the packaging container are airtight. On the other hand they should offer the possibility that one User can see that the container has not yet been opened. Beyond that she, of course also allow transportation, this means You need to have a certain stability. Nevertheless, they should be as possible have low weight, since during transport of course not only the weight of the content counts, but also the weight of the packaging.

Of the Invention is based on the object to provide a packaging container, which meets all these demands.

to solution this task strikes the invention with a packaging container in the form of a box the features of claim 1 before. Further developments of the invention are the subject of dependent claims.

The Can contains So a cylindrical, in particular circular cylindrical shell a polypropylene, preferably with oxygen protection is provided. The floor can be made of the same material exist and with the shell welded be. The lid, which is also welded to the case, becomes natural only used when the can is filled. The use of a plastic material with oxygen protection means that no air, especially no Oxygen, can get inside. Oxygen is the one A substance that causes food or luxury foods to age.

The Cylindrical shape means that the can has no kinks at any point, which represent a weakening could. The uniform curvature of the wall The can means that there is great stability of the can. The Can can stand on the front edge of the cylindrical sleeve, and it is in the axial direction the shell clearly resilient.

In Development of the invention can be provided that in the Lid associated end of the shell a ring of polypropylene is welded, which is a short-cylindrical inner jacket surface forms, on which the lid rests with an edge surface and with the Lid welded is. It is therefore formed a separate contact surface for the lid, so that a defined point is present at which the lid is welded.

In Further development of the invention can be provided that the lid at least on its edge surface, that is with the Area, with which he with the shell and / or the inner ring is welded, having Peeleigenschaften. This can be a special treat- ment of the material of the Cover or a coating act. Under a peel layer one understands a plastic layer whose temperature resistance or whose melting point is lower than that of the pure Plastic material. This can be achieved by additives. The peel layer allows on the one hand a liquid-tight and airtight sealing of the lid edge, but on the other hand allows a supersede without damage the peel layer.

On this way it becomes possible to remove the lid easily from the user.

In Further development of the invention can be provided that the bottom has a flat cylindrical lateral surface, with which he the shell welded is. This lateral surface leads to a larger area is available for the welding. In particular, it can be provided that the attachment of the soil such happens that the bottom of the lower front edge of the cylindrical shell has a certain distance. For example, the free edge the bent lateral surface flush with the floor with the free end edge of the shell run.

Of the Distance of the circular bottom of the front edge of the shell has the advantage that at a pressure increase inside the can first a Bulging the soil outwards takes place, which does not affect the stability of the can, as long as the ground does not bulge further than the level of the floor space becomes.

In Further development of the invention can be provided that the can is a pressure relief valve having. Such overpressure valves are known per se in packaging. In the known pressure relief valves the valve speaks at an overpressure from 3 to 5 mbar. However, the invention proposes a pressure relief valve to use, for example, only at about 60 to 80 mbar responds. This will make it possible that even with an overpressure, which leads to a larger bulge of the soil would, the stability and stability the can does not suffer.

In order neither to impair the visual impression nor to give rise to the possibility of damage, according to the invention in Wei training be provided that this pressure relief valve is placed in the bottom of the box. There it is not visible when the can is on the bottom.

The The can is preferably made from a flat blank and thus has a longitudinal seam on. This seam may be the welding of the superimposed laid edges of for the case used blank act.

The Invention proposes also a method for producing a packaging container in the form a can for packaging food and luxury foods. According to this method, a film is provided as an endless belt that then subtracted from the roll. The slide is divided into sections cut. Each section is curved about the longitudinal direction of the band, for example placed around a thorn. The slightly overlapping edges of the Blank are welded together. A floor will be the same Material stamped out and into one end of the blank inserted sleeve produced and welded. After filling a lid is inserted into the other end of the shell and welded.

In Development of the invention can be provided that the ground is welded at a distance from the associated end edge of the shell.

Around Too much buckling of the packaging container when increasing the To prevent pressure inside, can be provided according to the invention be that in the soil before its insertion into the shell an overpressure valve is used.

In Further development can be provided that in the lid end a ring shrink wrapped is, which rests against the inside of the shell and on the inner lateral surface the lid is brought to rest before it is welded.

Especially can be provided that the ring and the lid together first connected or assembled and welded as a unit with the shell.

Further Features, Details and Benefits The invention results from the claims and abstract, their wording by reference to the content of the description is made, the following description of preferred embodiments the invention and with reference to the drawing. Hereby show:

1 the perspective view of the items of a can according to the invention;

2 on a larger scale, a partial section through the individual parts of the can;

3 a representation of a pressure relief valve, as it comes with the can used;

4 a partial section through the pressure relief valve of 3 and

5 schematically the stages of manufacturing a can according to the invention.

First to 1 showing a perspective exploded view of the can serving as a packaging container. The box contains a cylindrical shell 1 which is made from a single blank. The edges of this initially flat blank are welded together and form a longitudinal seam 2 , The shell is circular cylindrical and has an upper end edge 3 and an end edge formed at the opposite end 4 on. The upper front edge 3 is a lid 5 assigned during the lower end edge 4 a floor 6 assigned. The floor 6 is as a flat element with a flat away from the can wall section 7 educated. It is inserted from the bottom into the can until the free edge 8th of the border section 7 flush with the front edge 4 the shell 1 runs. Then along the edge 7 an ultrasonic weld between the floor and the shell 1 , As a result, an airtight connection is given at this point.

On the opposite, in use state upper side of the shell 1 becomes a ring 9 arranged with its outside on the inside of the shell 1 is welded and slightly into the shell 1 protrudes into it. The ring 9 forms an inside 10 at the outer edge 11 of the lid 5 comes to the plant and to which it is welded. This outer edge 11 of the lid 5 has Peeleigenschaften, that is, he can be easily replaced there.

The 2 shows the details just described in their mutual association. The case 1 is shown aborted. In the left side corresponding to the front edge 3 So will the ring 9 used, which has an outer surface 12 and an inner surface 13 having. With the outer surface 12 he will be with the inside of the case 1 connected. He points to its outer surface 12 a flange 14 on, which has a contact surface 15 forms. This is the correct position of the ring 9 opposite the shell 1 Are defined.

With the inside 13 of the ring 19 affects the outside 11 of the lid 5 together. Also the lid 5 has at its end an outwardly projecting flange 16 on, at the example way, a grip tab 17 can be trained. At this flange 16 joins a cylindrical part, which then from an outward bead 18 followed.

The lid 5 is first in the ring 9 inserted and then as a unit in the slightly widened shell 1 used, and then ultrasonically welded with this.

At the opposite end is the floor element with its coat 7 also in the end of the shell from the front edge 4 pushed out until the free edge 8th of the floor element 6 flush with the front edge 4 runs. Subsequently, an ultrasonic welding takes place along the edge.

Of course the welding of the lid only when the can with the stimulant or the food filled is.

3 shows the top view of a pressure relief valve, as in the ground 6 the box can be mounted according to the invention. This pressure relief valve comprises two interconnected layers of plastic, wherein in the container-facing layer 23 a defined opening 20 is available. About this lower layer 23 is an upper layer 24 placed using two adhesive layers with the lower plastic layer 23 is glued. The two adhesive layers extend from the edge to the hole 20 , but leave a gap between them. The facing edges 22 the adhesive layer form one of an edge 25 of the pressure relief valve to the other edge 25 continuous channel in which the opening 20 empties. Between the two layers 23 . 24 is in this channel 21 applied a drop of silicone oil. The two layers are thus supported by the silicone oil also within the channel 25 to each other. If an overpressure arises in the interior of the can, it may be due to the space between the bottom foil, the edges 22 through the canal in the 4 escape up and down. Depending on how big hole 20 and the thickness and width of the adhesive layers, the pressure at which the pressure relief valve opens can be adjusted. According to the invention, a drop of silicone oil can be applied here, with which the characteristic of the pressure relief valve can be regulated even better.

now to 5 , 5 shows very simplified how to make the container from a present as an endless belt film. The foil 30 is from a roll of film 31 settled. The film roll has a width corresponding to the circumference of the can. The foil can on its later inside individual markings 32 indicating where the film is to be cut. The film is then rolled up so that the earlier side edges of the endless belt 30 overlap each other slightly. There is a weld to form the longitudinal seam 2 , That's the case 1 educated. The laying around and welding can be done on a mandrel, which holds the shell even when the ground 6 into which one end is inserted.

In detail, the procedure is as follows. The foil 30 gets off the roll of film 31 pre-processed into a register loop. From there, the required section length is drawn off via vacuum suction belts, which are driven by servomotors. This is about the Markierun gene 32 controlled, which are mounted on the film. The film is transported to a folding table and cut there.

Of the cut rectangular blank becomes a round folding mandrel folded. The film is held on the mandrel with suction air. The overlap both edges themselves and form an overlap seam.

It Several spines are star-shaped attached to a wheel, for example, eight spikes. On this thorn becomes the longitudinal seam sealed. The sealing pad is a sealing strip made of Steel and PTFE is made. In the Dorn surface there are holes, with where the foil can be blown off the sealing strip. The Sealing strip is required because the film can be sealed inside got to.

In the next Station, that is after turning the wheel containing the mandrels, the film is to pulled down the floor area from the mandrel. In the next station the floor area is slightly widened, for example, to a slope of 15 °.

In this station, the floor component 6 used. This component is also processed by a film roll. The film is pulled off from the film roll by means of a servomotor with rollers. A punch connected to a thermoforming tool cuts out the bottom member and deforms the rim as shown. About a turntable, this component is placed in front of the sealing tool. This tool takes over the soil component using vacuum and inserts it into the hull 1 with simultaneous sealing. This sealing can be done thermally or with ultrasound.

In the next Station of the folding mandrels having wheel is the ready to fill Can removed from the mandrel, for example, with glass-assisted mechanical Pull off. The can is then rotated by 90 ° so that the opening is upwards is directed, and is inserted into an intermittent wheel. On this wheel is the contents introduced and the box closed.

The fill For example, you can use coffee pods or ground coffee respectively.

At the To fill From coffee pods these are made from making in group stacks taken over in cassettes. The cassettes are mounted in groups on a chain. The chains can move individually.

On the way from the pad machine to the foil can machine become the pads evacuated and again gassed with nitrogen, that is the air is removed from the stack. The stack of pads is over the Nozzle the Driven foil dosing machine and pushed into the can. there is a nozzle assisted, which is designed for the diameter of the coffee pods. The can can previously be filled with liquid nitrogen be applied, which evaporates after about 4 seconds and thus a controlled overpressure generated in the film box.

The The can is now transported to the lid loading station, in the the lid is inserted into the box becomes. This may be a ring with the lid on, see above, or just a foil that is pushed into the can. After that the ring is sealed to the jacket.

Of the in the can building up overpressure, arising by the gas emitted by the coffee, as soon as it exceeds the value mentioned, through the pressure relief valve be delivered.

Claims (15)

Can for packaging of food and beverages, with 1.1 cylindrical shell ( 1 ) of a sealable material, in particular polypropylene, 1.2 one in the one end of the shell ( 1 ) welded-in floor ( 6 ), 1.3 one in the ground ( 6 ) opposite end of the shell ( 1 ) welded lid ( 5 ). Can according to claim 1, in which in the lid ( 5 ) associated end of the shell ( 1 ) a ring ( 9 ) is welded from polypropylene, which has an inner circumferential surface ( 13 ), on which the lid ( 5 ) with an edge surface ( 11 ) is present. Box according to claim 1 or 2, wherein the lid ( 5 ) at least on its shell ( 1 ) associated edge surface ( 11 ) is provided with a peel layer or has Peeleigenschaften. Box according to one of the preceding claims, in which the floor ( 6 ) a flat cylindrical lateral surface ( 7 ), along which he with the shell ( 1 ) is welded. Can according to Claim 4, in which the lateral surface ( 7 ) with its free edge ( 7 ) flush with the edge ( 4 ) of the envelope ( 1 ) runs. Box according to one of the preceding claims, in which the can is a pressure relief valve ( 3 ) having. Can according to claim 6, in which the overpressure valve in the bottom ( 6 ) of the can is arranged. Box according to one of the preceding claims, in which the envelope ( 1 ) the can has a longitudinal seam ( 2 ) having. Can according to one of the preceding claims, at the shell Has circular cylindrical shape. Method for producing a can, in which 10.1 a film is produced as an endless belt from a roll ( 31 ), 10.2 the film is divided into individual sections, 10.3 each section to a cylindrical shell (10) 1 ), the longitudinal edges of which are slightly overlapped, 10.4 the longitudinal edges are welded together, 10.5 in the one end of the shell formed thereby ( 1 ) a floor ( 6 ) 10.6 after filling into the open end of the envelope (FIG. 1 ) a lid ( 5 ) is welded. The method of claim 10, wherein the soil ( 6 ) at a distance from the front edge ( 4 ) of the envelope ( 1 ) is attached. Method according to claim 10 or 11, in which in the wall of the can, in particular in the bottom ( 6 ), a pressure relief valve is attached. Method according to one of claims 10 to 12, in which in the lid ( 5 ) associated end of the shell ( 1 ) a ring ( 9 ) is used, which on the inside of the shell ( 1 ) and at its inner lateral surface ( 13 ) the lid ( 5 ) is brought to the concern. Method according to Claim 13, in which the ring ( 9 ) and the lid ( 5 ) and then together on the shell ( 1 ) are welded. Method according to one of claims 10 to 14, wherein the lid ( 5 ) at least on its shell ( 1 ) is provided with Peeleigenschaften outside.