DE102009018489A1 - Packaging, in particular microwave packaging bags, with pressure compensating valve with variable flow cross section - Google Patents

Abstract

The present invention relates to a packaging (410), in particular packaging bags, preferably food packaging bags, particularly preferably for heating packaged goods by microwave radiation, wherein - considering a starting state of the package (410) - in a valve portion (434) of the packaging wall (430 ), which separates an interior space (432) enclosed by the packaging (410) from an outside area thereof, a valve weakening (438) of the packaging wall (430) is provided, which is adapted to a predetermined relative change of a gas pressure in the interior space ( 432) permitting gas passage between the interior space (432) and the outside area relative to an outside gas pressure, the valve portion (434) having a connecting portion (440) in which the valve portion (434) with a securing portion of the packaging wall (430) passes through a by relative change of the gas pressure in the interior (432) a releasable connection at least complicates a gas passage through the valve weakening (438), wherein the releasable connection is configured such that a connecting surface (442) of the connecting portion (440), via which the valve portion (434) and the securing portion are initially releasably connected together , gradually reduced under the influence of the changed gas pressure in the interior (432) to dissolve the connection, whereby the ...

Description

The The present invention relates to a packaging, in particular a Packaging bags, preferably food packaging bags, especially preferred for heating packaged goods Microwave radiation, wherein - considering an initial state the packaging - in a valve section of the packaging wall, which encloses a space enclosed by the packaging of a Exterior of the same separates, a valve weakening the packaging wall is provided, which is designed to from a predetermined relative change of a gas pressure in the interior relative to a gas pressure in the outdoor area a To allow passage of gas between interior and exterior, wherein the valve portion has a connecting portion, in which the valve portion with a securing portion of the packaging wall such by a relative change of the gas pressure in Interior detachable connection is connected to that the securing section a gas passage through the valve weakening at least impeded, wherein the releasable connection designed in such a way is that a connection surface of the connection area, over which the valve portion and the securing portion initially are detachably connected to each other, under the action of changed gas pressure in the interior to solve the Connection gradually reduced.

Of the Concept of releasable connection is under consideration the material strength of the materials involved as well as the intended use occurring forces to understand. A connection is referred to here as detachable, if by the intended use occurring forces is solvable without doing so the sections of the packaging wall involved in the connection be destroyed.

A Such packaging is known in Japan for cooking food. The packaged food will be packaged in one Microwave oven placed and heated by microwave radiation.

A schematic plan view of the front of the known packaging is shown in FIG 7 shown.

The microwave radiation is in the packaging 1 heated water, wherein it temporarily exceeds at least partially in the vapor phase.

As the warming progresses, so the pressure in the interior increases 2 the packaging resulting in a mechanical load on the packaging wall 3 leads.

In the known from Japan packaging 1 it is a packaging bag with a front 4 and a back, which are each formed of film laminate. The one with the front 4 a rear side of the packaging connected by a permanent closed edge seal R 1 is in the representation of 7 not recognizable. On the front side 4 and the back of the package is from the film in the valve section 8th each about a 2 mm large, the front 4 and the back piercing hole 5 punched out as a passage opening.

At a distance from the edge of the punched hole 5 is the front side 4 via an annular, with respect to the center of the punched hole 5 concentric connection surface 6 with a connection area 7 of the valve section 8th peelable sealed to a fuse portion formed by the back of the packaging bag.

When the pressure in the interior of the packaging increases relative to the outside environment as a result of heating, the front and back of the packaging become 1 inflated and stretched by the increasing internal pressure, so that with increasing internal pressure increasing peeling forces act on the detachable connection.

Then, when the peeling forces induced by the internal pressure on the releasable connection of the valve portion with the securing portion exceed the sealing seam strength of the releasable connection configured as a seal, the connection is gradually released until a channel to the through holes 5 is created by which then gas from the packaging interior 2 can escape to the outside.

This will cause unwanted bursting of the packaging 1 avoided during the heating of their contents. The passage openings and the releasable connection between the valve portion and securing portion act as a pressure equalization valve.

A disadvantage of this known solution, however, is that when the opening initially separating the through opening from the packaging interior detachable connection is solved so that a connection from the packaging interior to the through holes, the entire opening cross section of the through holes for a gas outlet is abruptly available. Furthermore, this opening cross-section also remains constant thereafter, if, for example, the packaging continues to be heated and the pressure in the interior of the packaging increases further. As a result, it can happen that undesirably too much or too little gas out escapes the packaging interior.

escapes too much gas from the inside of the packaging may be working the cooking process in the interior of the packaging does not turn off as desired, so that the contents of the package may be after the specified time not completely cooked.

escapes By contrast, too little gas from the packaging, it may be that despite it Provide the pressure compensation valve to an undesirable burst the packaging with the associated loss of the contents of the package comes.

It is therefore an object of the present invention, a package of specify the type mentioned, which is better than that from the The prior art known packaging a reliable Cooking the contents of the packaging allowed in the packaging and a unwanted bursting of the packaging with large Safety avoids.

These The object is achieved according to the invention that the connection area is so relative to the valve weakening is arranged that with decreasing connection area an intended for the passage of gas effective area the valve weakening becomes larger.

To According to the invention proposed here Solution is a packaging created in which the effective area of the valve weakening, ie those Surface intended for a gas passage is, according to the prevailing in the packaging relative Pressure difference forms to the outside of the valve section.

In The rule is the relative pressure difference between the interior and outdoor a relative overpressure in the interior be. Likewise, the relative change of the gas pressure in Interior usually a relative increase in gas pressure be in the interior relative to the gas pressure of the outside area.

There the relative pressure difference between interior and exterior the authoritative drive for the reduction the interface is smaller and smaller Connecting surface the effective area of the valve weakening enlarged, is changing with itself Pressure the detachable connection between securing section and valve section ever further solved and thus one ever larger area for the Gas passage provided, which in turn is increasingly strong Pressure equalization between interior and exterior allows.

There itself with changing internal pressure the connection area, over which the valve portion and the securing portion initially connected to each other releasably, only gradually can be downsized over a sufficiently long period of time a required pressure in the packaging interior can be ensured. Likewise, due to the above embodiment, an undesirable Bursting of the packaging can be prevented.

With "gradual" is meant that the releasable connection does not abruptly solves. Rather, it is said to be "gradual" be that the process of solving the releasable Connection for the naked human eye in his Process is observable. The release of the connection can thereby continuous as well as discontinuous in several, successive following stages. Due to the inventively provided Relationship between bonding surface and effective surface is therefore due to the gradual reduction of the Connecting surface during the dissolving process the entire Active surface not, as it is already known from the prior art is, released suddenly for a gas passage, but the effective area is gradually increased.

Around make sure that the valve weakening only after a certain duration of a relative change of the Gas pressure in the interior begins relative to the exterior, to be available for a gas passage, For example, the joint area may completely exhaust the valve surround. In other words, that means the valve weakening completely located in the area of the connection area is. Then, in fact, the connection surface must first by relative change of the gas pressure in the interior as long be reduced until the effective area of the valve weakening can be acted upon directly by the changing gas pressure.

to Magnification of the achievable effective area can Also provided in the backup section a valve weakening be. For these applies the above and the following to Valve weakening of the valve section said accordingly.

In order to achieve a sufficiently slow reduction of the connection surface with relative change of the gas pressure in the interior, the releasable connection may comprise a releasable bond or / and a releasable seal. Especially the releasable seal for food packaging shows outstanding properties. There is no need for additional adhesive to be introduced into the interior of the package by which the packaged goods could be adversely affected. In addition, releasable seals can be adjusted by adjusting the sealing parameters, such as sealing time, sealing pressure and / or sealing temperature Different strengths are generated, which are adapted to the particular packaged goods and the desired cooking times.

Especially preferred as releasable compound is a so-called "peelable", So peelable seal suitable, such as from tear-open packaging, for yoghurt, quark, cheese and the like, is known.

Around a defined release direction of the detachable connection to be able to guarantee, it is beneficial if the connecting surface with an elongated shape a longer characteristic dimension, such as edge length or semiaxis, and a shorter characteristic dimension, about edge length or half-axis, has.

at peelable bonds or seals is the peel the peelable connection required force at a given Seal strength proportional to the peel edge length. Therefore, a releasing process of releasable connection and associated with it, a reduction of the bonding area elongated shape of the connecting surface always over the Side initiated with the shorter characteristic dimension because here are due to the shorter characteristic Dimension give a relatively shorter peeling edge a relative small force for gradual separation of valve section and backup section is sufficient.

Therefore becomes from exceeding of a given limit pressure in Interior of the package peeling off the connecting portion from the securing section or vice versa usually in the longitudinal direction the elongated connection surface done.

Then, if the connection area is a rectangular or general polygonal shape, edge lengths be used as characteristic dimensions. In the event of an example elliptical shape of the connection surface Both the short and the long semiaxes of the ellipse can be considered as serve characteristic dimensions.

Around ensure that the changing pressure in the interior the packaging is sufficient, the detachable connection of securing section and valve section in time to solve gradually can be provided that the elongated interface at least one side with a shorter characteristic Dimension, preferably at least two, particularly preferred bordered on at least three sides of the interior.

Provided also edges of the packaging are formed by sealing, can thus be ensured that although the detachable connection is solved, the permanent marginal sealing of the packaging material but at the same internal pressure, in which the releasable Connection already begins to solve, persists because Edge seals usually only on one side and then along one longitudinal side adjacent to the interior of the packaging. In this case, the whole would be to the interior of the Packaging be adjacent longitudinal side peel edge, what already at a given pressure difference between the interior and exterior at slightly higher sealing seam strengths as that of the releasable connection to virtually insoluble edge seams leads.

alternative or in addition to loosening the above detachable connection by peeling off connection section and fuse section from each other, so to a continuous Solving the detachable connection, the releasable Connection at least in sections, also discontinuously gradually be solvable. This is about the case when the releasable Compound has a plurality of binding regions, which different required release parameters are assigned. Solvent Paramater can, for example, to release the connection necessary force and / or a temperature.

In In this case, the binding regions can each even have abruptly releasable compounds when the release parameters just adjusted so that the releasable connections dissolved in the individual binding regions in chronological order become.

Further The binding regions can each have peelable seals or bonds, with different binding regions then different seal seam strengths or / and different ones Sealing seam geometries may have.

hereby can solve the dissolving behavior of the releasable Connection depending on the pressure difference between interior and outdoor and associated with the pressure difference-dependent magnification the effective area of the valve weakening in almost be preset in any way.

in principle can be thought of the valve weakening as a breaking point to design, d. H. as a location at which the packaging wall has a lower strength than outside the valve section. Then the valve weakening after appropriate exposure by pressure-induced reduction of the bonding area by a directly acting on the valve weakening Gas pressure be broken up, so that then the gas passage through the Valve weakening is enabled.

Preferably is the defined setting for releasing a gas passage necessary pressure difference between interior and exterior but not in the design of the valve weakening but alone in the embodiment of the detachable connection, since This is a particularly high reproducibility of the pressure difference-dependent Release of a gas passage allows.

Therefore is in accordance with a preferred embodiment the present invention provides that the valve weakening at least one passage opening passing through the valve section having.

The initially mentioned enlargement of the effective area When reducing the connection area can be constructive for example, be solved by the valve weakening has a plurality of through holes, which in the direction of the longer characteristic dimension on each other are arranged following and / or of which subsets in different Binding regions are provided.

There The detachable connection with an elongated Connecting surface with peelable at the same time Connection usually along its longitudinal extent dissolves by peeling, with progressive Peel off the detachable connection then when in Direction of the longer characteristic dimension to each other following passage openings are provided, successively passage openings for a gas passage released and thus the effective flow cross-section successively increased.

alternative or additionally, the effective flow area also be increased by that subsets of the passage openings at different times, ie at different pressures, be released because they are in different tie regions are provided with different release parameters.

alternative or additionally, it may be provided that the valve weakening has an elongated passage opening whose Longitudinal direction at least one component in Direction of the longer characteristic dimension has and / or sections in different binding regions. In such, approximately slit-shaped, passage opening can the effective area of the valve weakening with Reducing the connection area to be increased continuously whereas in the aforementioned case, they have the plurality of through holes is increased discontinuously (stepwise).

adversely moreover, in the above-mentioned prior art Punching material to form the through hole. This is waste, of which in particular in the case of food packaging must be ensured that he not got into the packaging.

Therefore is according to an embodiment of the present Invention thought that the through hole only while removing the material connection, but avoiding one Material removal, such as by piercing and / or cutting of the valve portion is formed. In this case is used to manufacture the passage opening of the valve portion by a tool punctured, pierced or cut through, in particular from the piercing or piercing tool, material of the Connection portion merely displaced, preferably is displaced plastically, leaving a through hole arises without any contamination of the packaging interior is to be feared.

Farther In the above-described prior art, the connection area arranged at a significant distance from the edge of the passage opening. This leads to the risk that in between the Edge of the through hole and the connection area formed Accumulate impurities, which after loosening the releasable connection, that is usually during cooking of the packaged product, can contaminate the packaged goods.

Therefore is in accordance with an advantageous embodiment of present invention, that the connecting surface to a passage opening limiting edge thereof extends.

Especially preferred is a valve section containing the valve weakening completely detachable to the securing section glued on and / or sealed.

to Providing the lightest possible packaging be provided that the valve portion and / or the securing portion are formed from a film material, in particular film laminate. Then, when facing outsides of valve section and securing portion of a sealable material, such as polypropylene or polyethylene, may be the releasable compound particularly preferably without addition of adhesives by mere Melting the sealable layers and pressing be made of the same together.

Preferably, the entire package of sheet material, in particular film laminate ge forms. Foil laminate stains may then be bonded to a package by permanent seals.

A advantageous reduction of components, which for the production a packaging according to the invention needed can be achieved, that the valve section on a first side of the packaging and the securing portion on a from the first page different second side of the packaging is trained. Thus anyway existing pages of the Packaging for forming valve section and securing section used.

According to one advantageous development of this idea, can be provided that the valve section on one side of front and back the packaging is formed and the securing portion on the each other side from the front and back of the Packaging is formed. Because front and back the packaging are opposite anyway, the formation of the detachable connection between the valve section and securing section especially by pressing the two sections together easy to be formed.

Just in the case of a preferred use of the packaging discussed herein as food packaging also and just for the cooking process can it may be advantageous to place the packaging interior in a plurality of Subdivide part interiors so that in different Part-interiors may be packed with different products can. This can be a mutual influence the packaged products are excluded.

Then, when the connecting portion for separating the from the packaging enclosed interior in at least two partial interiors not only can that ensure itself in the packaging interior or in the part interiors almost it can also ensure optimal cooking conditions are products that, although kept separately, but cooked Condition mixed should be consumed while cooking come into contact with each other and thus can be mixed. Then that is when the detachable connection releases pressure-induced in the region of the connecting section, Thus, the separation of the interior into at least two partial interiors becomes possible canceled.

For reasons of best possible manufacturability, the packaging discussed here is preferably a packaging bag. For reasons of best possible handling of the packaging bag is preferably a stand-up pouch, such as he from the EP 1 371 578 A is known.

Then, if the packaging bag is designed such that the interior the packaging by at least three separate inner surfaces is limited, which meet at a Zwickelort each other, wherein the interface extends to the gusset location and preferably extends away from this, is with the Zwickelort a place provided, which as the weakest place of the Connection of the at least three inner surfaces with each other Starting point of a solution of the detachable connection is.

For example, as in 2 of the EP 1 371 578 A is shown, starting from the gusset in three different directions starting two inner surfaces of the packaging bag to each other, and meet only at the gusset itself all three involved inner surfaces. The inner surfaces involved in this case are: front inner surface, rear inner surface and an inner bottom surface provided therebetween. It should not be excluded that at least one of said inner surfaces is composed of a plurality of interconnected part-surfaces.

The describes the above description of the packaging discussed here, unless stated otherwise, the packaging in its initial state, d. H. with intact detachable connection.

In the preferred case of pouch packaging, in which the formation of the bag films are permanently sealed together, is provided according to the invention, that the strength of the releasable connection, in particular in the form of a releasable seal about 25% -50% the strength of the permanently provided connecting seams is.

Finally, in order to be able to adjust the pressure and the pressure course in the packaging interior in the desired manner during the entire heating or cooking process, it is also possible for the valve weakening to have a plurality of through-openings, wherein the through-openings ( 336 ) have different diameters and are arranged alternatively or additionally with different distances from each other.

The The present invention will now be described with reference to the accompanying drawings be explained in more detail. It shows:

1 a top view of a first embodiment of the invention,

2 a top view of a second embodiment of the invention,

3 a top view of a third embodiment of the invention,

4 a plan view of a fourth embodiment of the invention,

5a a top view of a fifth embodiment of the invention, in the form of a two-chamber packaging bag,

5b a cross-sectional view of the subject of 5 in the section plane VB-VB in 5a .

6 a plan view of a further embodiment and

7 a plan view of the known from Japan, initially described packaging bag.

In the 1 shown inventive packaging 10 comprises a front side formed of sheet material 12 as well as one in the view of 1 invisible, also formed from film material back, with the front and back are formed approximately square and the top 14 , at the lower edge 16 as well as at the two margins 18 through a head seal 24 , a bottomed seam 26 as well as two side sealing seams 28 connected to each other. It is therefore a packaging bag.

In all figures are sealed seams marked by hatching, where the density of the hatching lines symbolizes the seal seam strength. is in the case of a sealed seam, the density of the hatching lines increases as in another seal the same figure, so means this, unless stated otherwise, is also the seal seam strength one seal seam is larger than the other.

In the packaging bag according to the first embodiment, top, bottom and side sealing seams were used 24 . 26 . 28 sealed with the same sealing parameters and thus each have essentially the same seal strength.

front 12 and back form the packaging wall 30 which the interior 32 the packaging 10 encloses. In the interior 32 is usually a food, such as, inter alia, cooked rice, which can be placed with the packaging in the initial state in a microwave oven and heated there.

Furthermore, the packaging bag at its front 12 , Preferably also on its back, a marked by a dashed line valve section 34 in which in the present case fifteen by puncturing the front 12 formed through holes 36 are arranged substantially equidistantly along a straight line. The entirety of the passage openings 36 forms the valve weakening 38 ,

In the in 1 (As in all other figures) illustrated initial state, however, is still no gas passage through the through holes 36 possible, as these are in the connection area 40 of the valve section 34 are arranged, in which connection area 40 the front 12 with the back of the packaging 10 via a valve weakening 38 in total, as well as every single passage opening 36 surrounding interface 42 through another seal 44 gas impermeable is connected.

Here, the seal seam strength of the other sealed seam 44 significantly lower than the head, bottom or side sealing seams 24 . 26 . 28 so that the more sealed seam 44 unlike the other sealing seams 24 . 26 . 28 taking into account the material strengths of the materials involved, the dimensions of the sealed seam 44 and the forces occurring under normal use are designed as a releasable (peelable) sealed seam.

The through the detachable seal 44 formed connection surface 42 has essentially the shape of an elongated rectangle, with the longer characteristic dimension 46 the rectangle, so its longer side edge, approximately parallel to the side edges 18 of the packaging bag, the shorter characteristic dimension 48 parallel to the top and bottom 14 respectively. 16 ,

Is this in the food in the interior 32 the packaging 10 heated water, so the pressure in the interior increases 32 relative to the ambient pressure, resulting in the packaging 10 inflates. With increasing pressure also increases on the sealed seams 44 . 24 . 26 . 28 acting force to, due to the different sealing seam strengths that for releasing the other sealed seam 44 required force is significantly lower than that for loosening the other sealing seams 24 . 26 . 28 required force.

Therefore, when reaching a certain relative pressure in the interior begins 32 the sealed seam 44 to dissolve and thus the connection area 40 of the valve section 34 to peel off from the security section. Since the force required to release a sealed seam is proportional to the edge length, this process begins at the packaging interior 32 bordering narrow side 42a the interface 42 , that is, the shorter characteristic dimension 48 and continues in the direction of arrow P.

In particular, due to the attacking forces from two sides of the peeling process is usually at the two lower corners 42b the narrow side 42a the interface 42 start.

In this way, the through holes 36 with increasing pressure one after the other exposed, so that with increasing pressure also for the Gausaustritt from the interior 32 the packaging 10 available opening or flow cross-section becomes larger. The entire exposed opening area of the through holes 36 forms the active surface in the sense of the present invention.

By choosing suitable hole spacings and diameters, optimum pressure conditions in the packaging can be achieved throughout the heating process 10 be set for the desired cooking. In particular, it is possible through openings with different diameters or distances in the valve section 34 provided. Instead of the row of holes, a narrow slot is also possible, which extends approximately parallel to the longer characteristic dimension of the connecting surface.

at the other illustrated embodiments are Elements, the elements of the first embodiment correspond, denoted by reference numbers, by addition the number 100 for the second embodiment or 200, 300, 400, or 500 for the third, fourth, fifth or sixth embodiment of the corresponding Reference numerals of the first embodiment will become apparent. When marked by letters is for all embodiments the same letter is used. The following embodiments are described in more detail only insofar as they differ from the first Example differ on the above description otherwise expressly referenced.

2 shows a second embodiment of the present invention in the form of another packaging bag.

The essential difference from the first embodiment is that the releasable sealing seam 144 and thus the interface 142 to the top 114 the packaging 110 enough; the head seal 124 is interrupted accordingly. With correspondingly strong pressure development in the interior 132 the packaging 110 when the detachable seal seam 144 over its entire length a has solved, can an opening over the entire width b of the releasable seal seam 124 arise, causing a burst of packaging 110 can be effectively prevented at strongly increasing pressure.

Continue to run interface 142 at her in the interior 132 the packaging 110 projecting longitudinal end to point, this shape to direct the peeling process from the top 142b off in the direction of arrow P is used. Of course it is also possible to have a similar tip on the inside of the packaging 132 protruding longitudinal end of the connecting surface 42 of the first embodiment.

At the in 3 illustrated packaging 210 indicates the connection area 240 three binding regions 250a . 250b . 250c each with two through holes provided therein 236 on, wherein the binding regions have different sealing seam strengths and the seal seam strength is the lower, the farther the binding region into the interior 232 the packaging 210 protrudes. In such an arrangement, it is also possible to provide a compound which dissolves abruptly upon reaching a required dissolving force over the entire binding region, since the regions 250a . 250b and 250c due to the different release forces (release parameters) successively peel off and the effective area increases gradually with decreasing connecting surface gradually.

4 shows a further packaging according to the invention 310 also with three binding regions 350a . 350b . 350c with different release parameters. In this case, the binding regions are 350a . 350b . 350c however, in the direction along the upper edge 314 the packaging 310 arranged side by side and each have a parallel to the side edges 318 extending row of through holes 336 on, with the diameter of the through holes 336 in the binding regions 350a and 350c are larger than in the binding region 350b ,

As in the 2 The example shown also extends in the present case, the connection area 342 to the top 314 the packaging 310 and still has a tip 342b on which a detachment process of the binding regions 350a . 350b . 350c comprehensive connection area 340 with sufficient pressure increase in the interior 332 the packaging 310 starts. However, in the present case, the detachment process is not only in the direction of the arrow P but depending on the choice of the release parameters in the individual bonding regions and the geometric shape of the bonding surface 342 also in the direction of the arrow P 'continues.

The above examples illustrate that it is easy to produce different pressure conditions and pressure profiles in the packaging according to the invention, whereby optimal conditions, in particular cooking conditions, are always used for different applications can be made.

5 shows a further preferred embodiment of the present invention in the form of a two-chamber bag.

The structure of the packaging 410 corresponds essentially to that of the patent EP 1 371 578 B1 the multi-edge bag described by the applicant.

In contrast to the previously presented packaging, the two-chamber bag has a front side 412 and a back 413 (Vg. 5b ) also a bottom side 415 on, with front side 412 , Bottom side 415 and back 413 form a W-shaped fold, leaving two lower edges 416 arise at those front or back 412 respectively. 413 the packaging 410 with the bottom surface 415 by a bottom sealing seam 426 are connected. This can be particularly well in the cross-sectional representation of 5b detect.

The two chambers or part interiors 432a and 432b are in the illustrated initial state through the seal seams 444 . 445a and 445b separated from each other, which meet in a Zwickelort Z.

The sealed seams 445a and 445b which the inner surface 415i the bottom side 415 and the inside surface of the front 412i or the inner surface 415i the bottom side 415 and the inner surface 413i the back 413 connect with each other, while they have essentially the same seal seam strength as the head seal 424 and the side sealing seams 428 , The sealed seam strength of the bottom sealing seams 426 is a bit bigger in the present case. The sealed seam 444 which the inner surfaces 412i and 413i from front and back 412 . 413 connects again, is again designed as a detachable sealing seam, thus has a significantly lower seal seam strength.

In the illustrated embodiment, the seal seam strength is the top seal 424 , the side seal seams 428 as well as the sealing seams 445a and 445b about 15 N / 15 mm to 20 N / 15 mm, preferably about 20 N / 15 mm, the seal seam strength of the bottom seal 426 is about 20 N / 15 mm to 35 N / 15 mm, preferably 30 N / 15 mm, and the seal seam strength of the releasable seal 444 is about 10 N / 15 mm.

In the area of the sealed seam 444 is similar to the first embodiment in 1 a row of equidistant in the front 412 the packaging 410 arranged passage openings 436 provided, which extends to close to the gusset Z. The weakest place to connect the three inner surfaces 412i . 413i and 415i Zwickelort Z serves as the starting point for a solution of the detachable connection with a corresponding increase in pressure in the interior 432 the packaging 410 , so that when heating the food in the packaging 410 the sealed seam 444 , starting from the gusset Z, gradually opens and successively the through holes 436 are exposed to set the desired cooking conditions, while the food in the two part-internal spaces through the opening of the sealed seam 444 can be mixed together.

A Zwickelort Z near area 444a the sealed seam 444 is imperforate to prevent food from escaping.

In the previous examples, the passage openings and thus the valve weakening were always provided in the area of a detachable sealing seam. In practice, however, it has been found that this is not absolutely necessary to achieve the object of the present invention, as in 6 illustrated embodiment shows.

In the packaging bag shown there is the head seal 524 in a valve weakening area 560 interrupted, in which the front 512 and the back of the packaging 510 are not interconnected in the illustrated initial state. In turn, this area is along a straight line parallel to the side edges 518 the packaging 510 a series of through holes 536 arranged.

The valve weakening area 560 is by a detachable seal 544 which one in the interior 532 the packaging protruding tip 532b has, from the interior 532 separated, leaving this interior 532 through the head, bottom and side sealing seams 524 . 526 . 528 as well as through the detachable sealing seam 544 is separated from the environment in the illustrated initial state. The area over which the detachable sealing seam 544 extends, acts as the initial interface 542a , which initially gradually becomes smaller when heated with increasing internal pressure.

In practice, it has been shown that even in the example shown here in the valve weakening range 560 provided holes 536 one after the other for a gas outlet are available, and the gas is not abruptly by one at the top 560a the valve weakening area 560 any resulting opening escapes after the initial interface 542a so far has reduced that a passage from the interior 532 to the valve weakening area 560 originated

Water, which forms after the formation of the above-mentioned passage when heated to the inner surfaces of the front 512 and the back of the packaging 510 in the valve weakening area 560 precipitates, in conjunction with the dimensions of the valve weakening area 560 , in particular length L and width B of the interruption of the interrupted, permanent head seal 524 , for being the front 512 and the back over a newly created interface 542 be connected by adhesion (glass effect), so that with further pressure increase in the interior 532 the new interface 542 reduces and thus sequentially through holes 536 be exposed and so the effective area of the valve weakening 538 is enlarged. The connection area 540 in this case includes both the initial interface 542a as well as only after the occurrence of a passage in the valve weakening area 560 in this approximately by adhesion new forming interface 542 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1371578 A [0054, 0056]
• - EP 1371578 B1 [0091]

Claims (18)

Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ), in particular packaging bags, preferably food packaging bags, particularly preferably for heating packaged goods by microwave radiation, wherein - when considering an initial state of the packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) - in a valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) of the packaging wall ( 30 ; 130 ; 230 ; 330 ; 430 ), which one of the packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) enclosed interior ( 32 ; 132 ; 232 ; 332 ; 432 ) separates from an outer area thereof, a valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ) of the packaging wall ( 30 ; 130 ; 230 ; 330 ; 430 ) is provided, which is adapted, starting from a predetermined relative change of a gas pressure in the interior ( 32 ) relative to a gas pressure in the outdoor area a gas passage between the interior ( 32 ; 132 232 ; 332 ; 432 ) and outdoor area, the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) a connection area ( 40 ; 140 ; 240 ; 340 ; 440 ), in which the valve portion ( 34 ; 134 ; 234 ; 334 ; 434 ) with a securing portion of the packaging wall ( 30 ; 130 ; 230 ; 330 ; 430 ) by a relative change of the gas pressure in the interior ( 32 ; 132 ; 232 ; 332 ; 432 ) releasable connection is connected, that the securing section a gas passage through the valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ), wherein the detachable connection is designed such that a connection surface ( 42 ; 142 ; 242 ; 342 ; 442 ) of the connection area ( 40 ; 140 ; 240 ; 340 ; 440 ), via which the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) and the securing portion are initially detachably connected to one another, under the action of the changed gas pressure in the interior ( 32 ; 132 232 ; 332 ; 432 ) gradually decreases to dissolve the connection, characterized in that the connection region ( 40 ; 140 ; 240 ; 340 ; 440 ) relative to the valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ) is arranged, that with decreasing Verbindungsflä surface ( 42 ; 142 ; 242 ; 342 ; 442 ) provided for the passage of gas effective area of the valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ) gets bigger. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to claim 1, characterized in that the connection area ( 40 ; 140 ; 240 ; 340 ; 440 ) the valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ) completely surrounds. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to claim 1 or 2, characterized in that the releasable connection comprises a releasable bond and / or a releasable seal. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to claim 3, characterized in that the connecting surface ( 42 ; 142 ; 242 ; 342 ; 442 ) an elongated shape having a longer characteristic dimension ( 46 ; 146 ; 246 ; 346 ; 446 ), such as edge length or semiaxis, and a shorter characteristic dimension ( 48 ; 148 ; 248 ; 348 ; 448 ), such as edge length or half-axis, has. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to claim 4, characterized in that the elongated connecting surface ( 42 ; 142 ; 242 ; 342 ; 442 ) at least with one side having a shorter characteristic dimension ( 48 ; 148 ; 248 ; 348 ; 448 ), preferably at least two, more preferably at least three sides of the interior ( 32 ; 132 ; 232 ; 332 ; 432 ) borders. Packaging ( 210 ; 310 ) according to any one of the preceding claims, characterized in that the compound comprises a plurality of binding regions ( 250a . 250b . 250c ; 350a . 350b . 350c ), which are assigned different required release parameters. Packaging ( 10 ; 210 ; 310 ; 410 ) according to one of the preceding claims, characterized in that the valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ) at least one of the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) passing through opening ( 36 ; 136 ; 235 ; 336 ; 436 ) having. Packaging ( 10 ; 210 ; 310 ; 410 ) according to claim 7, including claim 4 or 6, characterized in that the valve weakening ( 38 ; 138 ; 238 ; 338 ; 438 ) a plurality of passage openings ( 36 ; 136 ; 236 ; 336 ; 436 ), which in the direction of the longer characteristic dimension ( 46 ; 146 ; 246 ; 346 ; 446 ) are arranged successively and / or of which subsets in different binding regions ( 250a . 250b . 250c ; 350a . 350b . 350c ) are provided. Packaging according to claim 7 or 8, including of claim 4 or 6, characterized in that the valve weakening has an elongated passage opening whose Longitudinal direction at least one component in the direction has the longer characteristic dimension and / or sections in different binding regions runs. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to one of claims 7 to 9, characterized in that the passage opening ( 36 ; 136 ; 236 ; 336 ; 436 ) only with removal of the material context, but avoiding a material decrease, such as by piercing and / or cutting through the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) is formed. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) after egg nem of claims 7 to 10, characterized in that the connecting surface ( 42 ; 142 ; 242 ; 342 ; 442 ) to one the passage opening ( 36 ; 138 ; 236 ; 336 ; 436 ) limiting edge of the same ranges. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to one of the preceding claims, characterized in that the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) and / or the securing section are formed from a foil material, in particular foil laminate. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to one of the preceding claims, characterized in that the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) on a first side of the package ( 10 ; 110 ; 210 ; 310 ; 410 ) and the securing section on a second side of the packaging which differs from the first side ( 10 ; 110 ; 210 ; 310 ; 410 ) is trained. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to claim 13, characterized in that the valve section ( 34 ; 134 ; 234 ; 334 ; 434 ) on one side from the front ( 12 ; 112 ; 212 ; 312 ; 412 ) and back ( 413 ) the packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) is formed and the securing portion on the other side from front ( 12 ; 112 ; 212 ; 312 ; 412 ) and back ( 413 ) the packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) is trained. Packaging ( 410 ) according to one of the preceding claims, characterized in that the connection region ( 440 ) for separating the from the packaging ( 410 ) enclosed interior ( 432 ) in at least two partial interiors ( 432 . 432b ) contributes. Packaging ( 10 ; 110 ; 210 ; 310 ; 410 ) according to one of the preceding claims, characterized in that it is a packaging bag, in particular stand-up pouch. Packaging ( 410 ) according to claim 16, characterized in that the interior ( 432 ) the packaging ( 410 ) by at least three separate inner surfaces ( 412i . 413i . 415i ), which meet at a gusset location (Z), wherein the joint surface ( 442 ) extends to the gusset location (Z) and preferably extends away therefrom. Packaging ( 310 ) according to one of the preceding claims, including claim 8, characterized in that the passage openings ( 336 ) have different diameters or / and are arranged at different distances from each other.