WO2012000938A1

WO2012000938A1 - Package and packaging unit

Info

Publication number: WO2012000938A1
Application number: PCT/EP2011/060717
Authority: WO
Inventors: Felix Von Stetten
Original assignee: Albert-Ludwigs-Universität Freiburg
Priority date: 2010-06-29
Filing date: 2011-06-27
Publication date: 2012-01-05
Also published as: DE102010030670B4; EP2588387A1; DE102010030670A1

Abstract

A package comprises a first package portion (10) having an internal space (12) for holding filling (16) and a second package portion (20) closing the internal space in a fluid-tight manner in a closed state of the package and allowing withdrawal of filling from the package in an opened state of the package. The second package portion is implemented such that when the package is opened a fluidic connection between internal space and environment is generated at an initial opening location. A separator (26) is provided allowing, when the package is opened, a discharge of gas from the internal space and thereby a pressure compensation between internal space and environment, and preventing a discharge of filling during pressure compensation. The separator can be provided between internal space and primary opening location (24). Alternatively, the primary opening location can be provided between internal space and separator.

Description

Package and Packaging Unit

Description

The present invention relates to a package and a packaging unit of such a package and filling and in particular such packages and packaging units suitable for liquid, powdery or granulated filling. In packages containing liquid filling, frequently, liquid is located at n intended opening location. One example for this is the liquid held between the upper edge of a container and a lid by capillary forces. It is known that during opening, for example by tearing off the lid, part of this liquid can be discharged into the environment and can be spilled, in particular when the pressure in the head space of the package is higher than the environmental pressure. Thereby, the environment is contaminated with filling discharged during opening. Frequently, clothing or furniture is affected, which results in costs for premature cleaning. In some cases, the spilling liquid can also come in contact with skin or eyes, which can cause irritations in the case of acid or technical liquids. The stated problems are known and there are different suggestions how users can protect themselves from spilling liquids. One example for such a piece of advice is to cover the package with a cloth.

Further, in order to ease these problems, there is a package-technological approach consisting of generating a negative pressure between the surface of the filling and the lid of the package. If the lid is opened in this case, air from the environment will flow into the inside of the package and no discharge of filling occurs. Generating the head space vacuum can take place in different ways. Two options are exemplarily stated. A first option is to press the elastic floor of the package to the inside prior to closing with the lid in order to minimize the inner volume. After closing with the lid, the floor is relaxed again which results in negative pressure in the head space. A second option is to flood the head space with water vapor prior to closing the head space with the lid. On the one hand, water vapor displaces the air in the head space or mixes with the air and heats the same. After the lid has been put on, the water vapor condensates and the heated air cools. Both effects result in a negative pressure in the head space.

However, the solution of the problem by generating negative pressure in the head space of the package has several disadvantages. First, generating the head space vacuum results in increased plant costs. Further, the obtainable negative pressure is not very high, and at higher altitudes or in a plane, the lid will still bulge, or a negative pressure of the head space with respect to the environment occurs, in particular when filling the product has taken place at lower altitudes. Above this, the negative pressure is not maintained when a filling is packed which gasses out or develops gas during storage, such as kefir. Further, the negative pressure is not maintained when a product that is kept cool is heated prior to consumption, for example by room temperature or in a water bath. Thus, such package is not guaranteed discharge-free. Further, from the prior art, approaches for venting containers are known. Thus, DE 20 2008 006 825 Ul shows a drinking cup lip having at least one outlet opening and a vent opening, which can be closed via a common sealing device arranged at a bottom side of the lid. From WO 00/35773, a liquid container is known, where a pressure control device is arranged. A device for withdrawing liquid is provided, wherein the pressure control device is arranged to maintain a substantially constant pre-set pressure within the container.

From EP 0 754 630 Al , a closing cap for containers, housings, bottles and the same is known, comprising a pressure compensation device with at least one membrane of a liquid- tight and solid-tight but gas-permeable material and a splash-protection element of a gas- permeable material for breaking the splash pressure of the liquid and the solid on the membrane. According to this document, the pressure compensation device is provided to provide pressure compensation in the closed state of a container.

Finally, from DE 20 2008 009 728 Ul, a container for receiving liquids is known, comprising a cup and a protective foil attached to the upper cup edge as well as a protruding tab. A wire is attached to the bottom of the protective foil, reachable at least at one location from outside the cup for enabling easy opening of the cup.

So far, however, there is no reliable package-technological solution preventing discharge of filling by positive head space pressure.

Thus, it is the object of the present invention to provide a package as well as a packaging unit comprising a package and a filling located in the package reliably preventing discharge of filling when opening the package. This object is solved by a package according to claim 1 and a packaging unit according to claim 22.

The present invention provides a package, comprising: a first package portion comprising an internal space for holding filling; and a second package portion enclosing the internal space in a fluid-tight manner in a closed state of the package and allowing discharge of the filling from the package in an opened state of the package, wherein the second package portion is implemented such that when opening the package a fluidic connection is generated between internal space and environment at an initial opening location, wherein a separator is provided allowing discharge of gas from the internal space when opening the package and thereby pressure compensation between internal space and environment and preventing discharge of filling during pressure compensation. In embodiments of the invention, the separator can be provided between internal space and initial opening location, i.e., the location where the first fluidic connection between internal space and environment takes place when opening a package, which can also be referred to as primary opening location. In embodiments of the invention, the initial opening location can be provided between separator and internal space.

Embodiments of the invention provide a packaging unit comprising such a package and a liquid, powdery or granulated filling located in the internal space, wherein a head space, where gas is located, can exist in the internal space. Providing a separator in the inventive manner allows pressure compensation between environment and internal space when opening a packaging unit without spilling the filling, e.g., liquids, powdery filling or granulated filling into the environment. Thus, embodiments of the present invention allow discharge-safe packages, such that the damage resulting from spilled filling can be eliminated. Embodiments of the invention are related to packages comprising a container and a peelable lid, such as cups or dishes or folding boxes with lids. Embodiments of the invention relate to bag packages with tear-off opening. Embodiments of the invention relate to packages with screw-on lid, snap-on lids, crown corks, corks, plugs or the same. Thus, embodiments of the invention provide packages and packaging units preventing contamination of the environment when opening the packaging unit, such that clothing, furniture and body parts, in particular eyes, can be protected. Thus, embodiments of the invention allow also packaging of dangerous material, such as acids or other aggressive liquids in respective packaging units. In embodiments of the present invention, the separator can be integrated in the first package portion and/or the second package portion, such that no additional components are required at the package machine, but the separator can be implemented by a respectively modified moulding tool used for producing the package, which can be directly ported to all existing lines, such as thermo form-injection moulding and mould-fill-seal lines.

Embodiments of the present invention will be discussed below with reference to the accompanying drawings. They show:

Figs, la and lb schematic illustrations of embodiments of the invention;

Fig. 2 a schematic side view and a top view of a packaging unit according to the prior art;

Fig. 3 a schematic side view and a top view of a packaging unit according to an embodiment of the invention;

Figs. 4a to 4c enlarged partial views for explaining embodiments of the invention;

Fig. 5 a schematic top view of an alternative embodiment of the invention;

Fig. 6a a schematic top view of a further embodiment of the invention; Fig. 6b a schematic illustration of an embodiment with capillary separator;

Fig. 7 schematic views for explaining an advantageous arrangement of a fluid connection between internal space and separator in embodiments of the invention;

Figs. 8 to 10 schematic top views for explaining further embodiments of the invention; Figs. 1 la to 12b schematic illustrations of embodiments of the invention where the second package portion is formed by a cork or screw-on lid;

Fig. 13 a schematic illustration where the package is a bag package; and

Figs. 14a to 15c schematic illustrations useful for understanding the invention.

Embodiments of the invention described below based on detailed embodiments relate to the field of safe packages of food stuff and articles of daily use, in particular the field of packages with peelable lids, for example packages of coffee cream and other milk or dairy products but also packages of further food stuff, such as baby food, tomato puree or packages of technical liquids, such as motor-cleaning fuel additives and the same. In this context, in particular packages comprising cups, dishes or folding boxes with peelable lids, bag packages with tear-off openings or packages with screw-on lids, snap-on lids, crown corks, corks, plugs or the same will be described below. However, for people skilled in the art, it is obvious that the inventive principle can be transferred to a plurality of further packages.

Embodiments of the invention enable discharge-safe packages where damages caused by spilled filling can be eliminated. In particular, embodiments of the invention are thus suitable for packing fillings that heavily stain, such as food stuffs, like tomato sauce, food stuff heated prior to consumption, such as ready-made meals and baby food or acid liquids, such as acids or alkaline solutions. Embodiments of the invention, in particular, allow the opening of packages even when a pressure difference exists between environment and head space of the package, as it can be the case due to the pressure difference between cabin in an airplane and head space of the package, for example, without discharging filling during opening. Several airlines, for example, offer coffee cream in cups with peelable lids, wherein the lids are frequently bulged due to the pressure difference between cabin and head space of the package. If the lid foil is torn off, and the opening location is wetted with cream, the same is accelerated by escaping air and discharged from the package. As a consequence, in airplanes of the respective airlines, for example, the dark blue backrests are dotted with white coffee cream stains and have to be frequently cleaned for aesthetic and hygienic reasons, which results in unnecessary costs. A similar problem can occur in restaurants, where the invention can help to reduce increased effort or costs for cleaning clothing stained by spilled filling, such as coffee cream splashes.

Numerous other food stuff is also packaged in packages with peelable lids, such as salad cream, sour cream and kefir. All stated products can cause increased effort or even serious damage due to spilling by contaminating valuable clothing or furniture. In particular kefir, always generates positive pressure by fermentation occurring within the package, whereby opening the packaging unit is almost always connected with spilling kefir. Further, it is expected that in future baby food will no longer be brought onto the market in glasses but rather in plastic cups with peelable lids, packed in a product-protecting aseptic manner. Since this baby food is normally heated prior to consumption, positive head space pressure results due to expanding air, wherein embodiments of the invention can avoid discharge of filling during opening in such a case. Additionally, it is also common to sell technical liquids in packages with peelable lids, for example aggressive cleaning agents for engines. Spilling such liquids can cause the danger of contaminating skin or eyes with the liquid, which can result in irritations and health hazards. Embodiments of the present invention allow discharge- safe packaging of such liquids such that the stated dangers are eliminated.

Fig. la and lb show schematic illustrations for explaining the concept underlying the invention based on two embodiments.

The package comprises a first package portion formed by a container such as a cup. The container 10 has an internal space 12 filled with filling 16 up to a filling level 14, such that a head space 18 is formed. A peelable lid 20 forms a second package portion. If the peelable lid is opened, a fluidic connection results between internal space 12 and environment 22 at the location 24 opened first, shown as valve in Fig. la. A separator 26 is provided between internal space and the location 24 opened first, which can also be referred to as initial opening location.

When the lid 20 is opened and a positive pressure exists in the head space 18 filled with gas in relation to the environment 22, head space vent takes place by the separator 26, as illustrated by arrow 28 in Fig. la. The separator 26 is implemented to retain filling transported by escaping gas during this vent. Therefore, the separator 26 can be implemented in any way, for example as centrifugal separator, as capillary separator, as separator with filter or absorbent matrix, as separator with filling reception area whose volume is pressure-dependent, as separator with mechanical elements or materials for destroying foam, or with a curved or meandering fluid channel.

By providing the separator 26 between the location 24 opened first and the internal space 12 of the container 10, it can be securely prevented that filling is discharged when opening the package. In alternative embodiments, the valve, i.e., the location opened first, can also be arranged between internal space and a separator, as long as it is ensured that a gas stream for leaving the package flows through the separator. Such an alternative embodiment is shown schematically in Fig. lb. Here, head space vent also takes place through the separator 26, as indicated by the arrow 28. Thereby, fluidic structures can be provided between valve 24 and separator 26 that ensure that the gas stream flows through the separator 26 behind the valve. In embodiments of the present invention, the separator can be provided between the internal space and the initial opening location, while in alternative embodiments of the invention, the initial opening location can be provided between separator and internal space. An embodiment of the present invention in the form of a cup with peelable lid will be discussed below with reference to Figs. 2 and 3.

Fig. 2 shows a package according to the prior art, in the form of a cup 1000 with peelable lid 1002. The cup 1000 has a sealing edge 1004 where the peelable lid 1002 is connected to the cup 1000. One area of the sealing edge 1004 has a bulge 1006, above which a pull- open tab 1008 of the peelable lid 1002 is arranged. Here, it should be noted that lids in the top views herein are each illustrated partly transparent, such that the structures arranged below can be seen. In the container 1000, a liquid filling 1010, for example condensed milk, is arranged up to a filling level 1012 such that a head space 1014 filled with gas exists. A spandrel liquid 1016 is held by capillary forces between the peelable lid 1002 and the container 1000.

When the package shown in Fig. 2 is opened by pulling open the pull-open tab 1008, a fluidic connection is established between the internal space of the package and the environment at a location 1018 opened first. This location can be considered as valve, wherein after opening the valve a gas stream 1020 occurs at a positive pressure existing in the head space 1014 with respect to the environment, by which the head space 1014 is vented in order to compensate the positive pressure. This gas stream discharges liquid of the spandrel liquid 1016 is, as is shown by a liquid drop 1022 in Fig. 2. By this gas discharge, the environment can become contaminated. Fig. 3 shows an embodiment of the invention where such a discharge is prevented by implementing a separator in a sealing edge where peelable lid and cup are connected, e.g. as a channel-shaped recess running in the sealing edge. Fig. 3 shows package comprising a cup 30 having a sealing edge 32, which is structured to implement a liquid separator. A peelable lid 34 is connected to the sealing edge in the closed state of the package, such that an internal space 36 of the package is closed in a fluid-tight manner. The sealing edge 32 comprises a bulge 38, above which a pull-open tab 40 of the peelable lid 34 is arranged. By pulling the pull-open tab 40 and by the resulting peeling off of the peelable lid 34 from the cup 30, the package can be opened.

In the embodiment shown, a separator 42 is implemented by fluidic structures formed within the sealing edge 32. The fluidic structures comprise a capillary 44 leading into the internal space 36 at one end and into an arcuate fluid channel 46 at another end. In the embodiment shown, the outer shape of the cup 30 is circular, wherein the fluid channel 46 runs in a ring-shaped manner around portions of the outer periphery of the cup 30. At the end remote from the capillary 44, the fluid channel 46 leads into a recess 48 formed in the bulge 38 and thus below the pull-open tab. In areas of the sealing edge where no fluidic structures or fluid channels are formed, the lid is connected to the sealing edge, as will be discussed in more detail below with reference to Figs. 8 and 9.

The cup 30 is filled with a liquid filling 50 up to a filling level 52. Gas is in a head space 54. Spandrel liquid 56 is held within the non-vented separator at the upper edge where peelable lid 34 and cup 30 are connected by capillary forces and counterpressure.

If the lid 34 is peeled off for opening the package, a fluidic connection between the internal space 36 and the environment will result at a location 58 opened first. More accurately, the fluidic connection takes place via capillary 44, fluid channel 46 and recess 48. Via these channel structures, gas stream 60 from the internal space to the environment takes place when a positive pressure exists in the head space 54 with respect to the environment. Thus, the gas stream takes place through the separator 42 so that filling transported in the gas stream is spun, due to its higher mass, centrifugally at the outer edge of the fluid channel 46 and additionally, due to its inert mass, into the recess 48 and deposited there. Thus, liquid discharge can be reliably prevented. Further, the channel 42 can be implemented such that part of the centrifugally deposited liquid is already held back there by capillary forces, as will be discussed below, for example, with reference to Fig. 6b. Thus, Fig. 3 shows an implementation of an embodiment of the invention that is advantageous in terms of production, wherein in particular the monolithic integration of the separator in the area of the sealing edge of the package is advantageous. As shown, the separator is formed as a recess within the sealing edge between the head space vent formed by the end of the capillary 44 leading into the internal space 36 and location 58 opened first that can be referred to as valve. This recess has appropriate structures for separating the filling carried along with the gas streaming out. In the embodiment shown, the valve, i.e. the location opened first, is also implemented as an integral part of the package by placing the valve-side end of the separator below the pull-open tab 40. In such an embodiment, substantially no additional production costs or technological requirements of the package machine result by implementing the separator, since merely the moulding tool has to be adapted.

In the embodiment shown in Fig. 3, the separator is formed by a recess between head space vent and valve running along the sealing edge between lid and container. However, for people skilled in the art it is obvious that other designs of the separator are possible. For example, the separator can extend across half or the whole periphery of the sealing edge. However, the separator can also be only in the area of the pull-open tab of the lid. The separator can be implemented as a recess in the cup part of the sealing edge, but can also be implemented as an elevation of the lid or by a combination of recesses in the sealing edge of the cup and elevations in the lid.

In order to prevent premature filling of the separator with spandrel liquid, the separator can be connected to the head space via one or several capillaries, wherein the same can be connected to the separator via one or several geometric valves, for example in the form of a fishbone structure. The capillary needs to have a sufficient cross-section in order to enable pressure compensation fast enough before the lid is pulled open so far that the head space comes into contact with the environment by bypassing the separator. An example of such a capillary is the capillary 44 shown in Fig. 3, via which the fluid channel 46 of the separator 42 is fluidically connected to the internal space 36.

In the embodiment described with reference to Fig. 3, attention has to be paid that the structures of the separator are deep enough to avoid clogging up of the fluidic structures by melted polymer or glue when the lid is deposited during closure of the package by a sealing method. Thereby, the mentioned capillary can be widened so much at the position of the head space vent that the same is not closed when depositing a lid. Possible embodiments or implementations of capillary structures fluidically connecting the head space with the separator will be described below with reference to Figs. 4a to 4c.

Fig. 4a schematically shows a portion of a sealing edge 62 in which a fluidic structure 64 of a separator and a capillary fluid channel 66 fluidically connecting the fluidic structure 64 of the separator with a head space 68 of an internal space of a container 70 are formed. Fig. 4b schematically shows a partial cross-sectional view of this arrangement. Fig. 4b further illustrates a lid 72 forming a package together with the container 70, wherein the lid 72 forms the respective fluidic structures, i.e. the capillary fluid channel 66 as well as the fluidic structure 64 of the separator together with the sealing edge 62. As is shown in Fig. 4b, the container 70 is filled with liquid filling 76 up to a filling level 74. Spandrel liquid 78 is again arranged at the connecting location of the lid 72 and the container 70, wherein the spandrel liquid 78 fills the capillary fluid channel 66. A geometric valve 80 is formed at the transition of capillary fluid channel 66 to fluidic structure 64. The area 82 where the capillary fluid channel 66 leads into the head space 68 is expanded in order to ensure that the head space vent is not clogged by material melting during thermal sealing. A liquid meniscus 84 is formed at the geometric valve 80, whose surface tension prevents the separator from being filled with liquid filling. In embodiments of the invention, the capillary fluid channel 66 can act as a hydro pneumatic valve together with the separator. The fluidic structures 64 of the separator are closed in a fluid-tight manner in the closed state of the package with the exception of the capillary fluid channel 66. Thus, gas within the fluidic structure of the separator cannot escape when liquid enters the capillary fluid channel 66, so that, even if positive pressure in the head space 68 were to exceed the force generated by surface tension at the meniscus, further entering of liquid into the fluidic structure of the separator is prevented, since the gas within the separator generates a respective counterpressure.

The flow cross-sectional profile of the capillary fluid channel and/or of fluidic structures of the separator can advantageously be formed in an asymmetric manner in order to ease forming of a gas stream through areas that were first closed by capillary adhering filling, such as liquid. Examples of fluidic channels formed in an asymmetrical manner in depth direction are shown in Fig. 4c. With reference to Fig. 5, an embodiment of the invention will be described where a separator is arranged in the area of the pull-open tab. Fig. 5 again schematically shows a top view onto a package in the form of a cup 30 with peelable lid 34 merely differing from the package shown in Fig. 3 with respect to the separator. Thus, with reference to Fig. 5, merely the resulting differences will be explained. Again, the peelable lid 34 is shown at least partly in a transparent manner in order to be able to see the structures below.

In the embodiment shown in Fig. 5, a separator is formed by a recess 90 formed in the bulge 38 of the sealing edge 32 illustrated by contour lines. A capillary fluid channel 92 fluidically connects the recess 90 with the internal space 54 and leads into the internal space 54 at a head space vent location 94. As is shown in Fig. 5, a predetermined breaking point 96 is provided in the sealing edge 32 below the pull-open tab 40 of the peelable lid 34, which facilitates peeling off the lid 34. Respective predetermined breaking points are known from the prior art. In an embodiment of the invention, the predetermined breaking point can be used for opening the fluidic structures, i.e. the vent channel of the separator at a defined location, namely at the location 98 shown in Fig. 5, which represents the location where a fluidic connection between the internal space and the environment occurs first when the package is opened. During this opening, a gas stream 100 through the fluidic structures of the separator occurs at a positive pressure in the internal space 54, as is shown by the dotted line in Fig. 5. Filling carried along by this gas stream 100, for example by the spandrel liquid 56, is centrifugally deposited by the inertia of its mass in the separator formed as recess 90. When the separator is positioned in the area of the pull-open tab, deposited liquid can also be spilled when the lid is opened. Thus, advantageously, the above-described separator can also be positioned directly after the capillary in an area where the lid is not pulled off, as will be discussed in more detail, for example with reference to Fig. 10.

By introducing respective recesses or structures, the separator can be implemented such that the separation of filling, in particular of liquid and gas phase, is supported. An example of respective structures is shown in Fig. 6a. As is shown in Fig. 6a, the separator in this embodiment, in addition to the recess 90, comprises structures 102 additionally supporting the separation of filling 104 from the gas stream 100. In the shown embodiment, these structures are bulges 106 positioned radially to the outside in an arcuate fluid channel 108, so that filling carried away with the gas stream 100 due to centrifugal forces is collected in the bulges. In the embodiment shown in Fig. 6a, the separator comprises the recess 90 and structures 102. In alternative embodiments, the separator can merely comprise the structures 102. Fig. 6b schematically shows a top view D, an enlarged section V and a sectional cross- sectional view Q of an embodiment having a capillary separator. As can be seen in the top view D, a separator 42a comprises a channel 46a which can, for example, have a flow cross-section, as is shown in the cross-sectional view Q. The flow cross-section tapers towards the outside and is pointed, for example. If an airflow 100 moves through the channel 46a, liquid 104a carried with the air stream is deposited in the radial outer area of the channel 46a in a centrifugal and capillary manner. At least the outer area of the channel 46a has such dimensions that centrifugal and/or capillary forces acting on the liquid are larger than forces effected by the airflow 100, so that the liquid is separated in the channel 46a.

With reference to Fig. 7, an advantageous arrangement of the head space vent will now be shown, i.e. the location where the capillary leads into the head space in the embodiment shown in Fig. 3. The capillary 44 leads into the head space 36 at a position 1 10.

Three possible orientations of the packaging unit when the same is opened are shown on the right in Fig. 7. An arrow 1 10 indicates the pull-open tab for opening the peelable lid. The two top orientations indicated by numbers 1 and 2 are frequent, while the bottom orientation indicated by number 3 is unusual. When venting, the head space venting location should not be in contact with the filling 50 but with the head space 54. In order to ensure this with high probability in conventional orientations of the package when opening, the position 110 of the head space vent should be selected such that typical orientations during opening are taken into account. Advantageous positions 110 of the head space vent are thus in a range of 0° (or 360°) ± 45°. This range of angles is shown by position indications "A" and "B" in the right illustration in Fig. 7. Contrary to this, the position indication "C" shown in Fig. 7 represents an unfavorable position.

In embodiments of the invention, the separator can also be connected to the head space via more than one head space vent, wherein for this purpose several capillary fluid channels can be provided that are fluidically connected in parallel.

Fig. 8 schematically shows a sealing joint 120 for the embodiment of a package shown in Fig. 3. The sealing joint 120 is thereby shown shaded in Fig. 8. The sealing joint 120 represents those areas of the lid connected to the sealing edge 32 of the container. As can be seen in Fig. 8, in particular in the area of the pull-open tab 40 and the bulge 38 of the sealing edge 32, the sealing joint 120 does not have to comprise the whole area of the pull- open tab, as is indicated by an area 122. Thereby, pulling open the lid can be facilitated for the user.

Fig. 9 schematically shows the sealing joint 120 in an alternative embodiment with a predetermined breaking point 96. As is shown in Fig. 9, in this embodiment the fluidic structures formed in the sealing edge 32 are implemented in the area of the bulge 38 such that a defined initial opening point 98 results in the area of the predetermined breaking point, comparable to the embodiment shown in Fig. 5. For opening the package, the predetermined breaking point 96 is broken in the area of the bulge 38 of the container 30, so that the broken-off part can be pulled off together with the lid, as is again illustrated by an arrow 110 in Fig. 9. Thereby, the location of the initial opening point, i.e. the valve, can be exactly defined. In addition to that, between breaking at the predetermined breaking point 96 and pulling open the lid there is a short interval, which is sufficient to ensure a well-defined pressure compensation via the separator 42. Fig. 10 schematically shows an embodiment of the invention where two separators are arranged fluidically in parallel. The same or equal elements are indicated with the same reference numbers in Fig. 10 as in Fig. 3. Fig. 10 shows a first separator system 130 leading into the head space 54 at a first head space vent location 132, and a second separator system 134 leading into the head space 54 at a second head space vent location 136. A predetermined breaking point 96 can be provided, so that when the package is opened defined initial opening locations exist, as is indicated by valves 138 and 140 in Fig. 10. The head space vent locations 132 and 136 are spaced apart, so that in different storage positions of the package in each case only one or none of the head space vent locations comes into contact with filling. Fig. 9 illustrates, for example, a case in which, for example due to non-orthogonal storage of the packaging unit, the second separator system 130 has been filled with filling, so that venting takes place via the non-filled separator system 130, since the same has a lower fluidic resistance. This is indicated by the gas stream 100 in Fig. 10. By respectively providing a plurality of separators with different head space vent locations, redundancy can be provided which can reliably prevent the discharge of filling when opening even in the case of incorrect storage or opening of the package.

One embodiment of the invention, where the first package portion is a bottle and the second package portion a cork, will be shown with reference to Figs. 11 a and 1 lb. Fig. 1 la shows the respective package in the closed state, while Fig. l ib shows the package during opening. In the closed state, a cork 150 closes a bottle neck 152 in the usual manner. A liquid separator 154 is integrated in the cork 150. The separator 154 is fluidically coupled to a fluid opening 158 via a fluid channel 156, wherein the fluid opening is fluidically connected to the internal space 150 of the bottle in the closed state. A second fluid channel 162 is provided, via which the separator is coupled to a second fluid opening 164. As is shown in Fig. 11a, the second fluid opening 164 is closed by the bottle neck 152 in the closed state of the package. When the cork 150 is pulled out of the bottle, the bottle neck 152 releases the second fluid opening 164, so that a gas stream path 100 through the fluid channel 156, the separator 154 and the fluid channel 162 results. Thereby, during opening, vent through the separator 154 can take place, wherein liquid transported in the gas stream 100 is separated in the separator. In this embodiment, the separator 154 can preferably include foam-destroying elements or materials, so that liquid transported in the gas stream can be reliably separated from the filling-gas mixture (for example foam). A respective closure can, for example, be formed as a screw-on lid, a cork or a crown cap. Thus, embodiments of the invention can also include, in particular, bottles for effervescent beverages.

An alternative embodiment suitable for a screw-on lid is shown in Figs. 12a and 12b, wherein Fig. 12a shows the package in the closed state, while Fig. 12b shows the package during an opening process by rotating a cap 150', as is indicated by an arrow 170. As is illustrated, the bottle neck 152 has a passage 152a at the upper edge of the same, so that when the closure 150' is rotated the second fluid opening 164 is aligned with the passage 152a, so that vent can take place via the separator 154, as is again indicated by a gas stream 100. Here, the separator 154 can again have an integrated foam-destroying means. A field of application for the embodiment as is shown in Figs. 12a and 12b can, for example, be containers for fillings that are harmful to health or poisonous in package that can be under pressure. The separator 154, as is shown in Figs. 1 la to 12b, can have any suitable structure, wherein the same can be implemented, for example, by a centrifugal separator, a filter or a separator with a structure as is shown in Fig. 13.

A further embodiment of the invention in the form of a bag package 200 will be described below with reference to Fig. 13. The bag package 200 includes a first package portion 202 and a second package portion 204. A tear-open opening 206 is provided between the first package portion 202 and the second package portion 204. For opening the bag package 200, the same is torn off along a tear-open line 208. The first package portion 202 has an internal space 213 filled with filling 212 up to a filling level 210, so that a head space 214 that can be empty or gassed is formed above the filling level 210. In the second package portion 204 that is removed at least partly when tearing open the first package portion 202, a separator 216 is formed. The separator 216 has a meandering fluidic structure, wherein bulges 216a are provided at respective impingement slopes of the meandering fluidic structure. The fluidic structure of the separator is connected to the head space 214 via a head space vent 218, which can again, for example, be a capillary channel.

If the bag package is opened by tearing the same open at the tear-open opening 206, a location 220 represents an initial opening location generating a fluidic connection between environment and internal space of the bag package via the fluidic structures of the separator 216 and the channel 218. Thus, for pressure compensation between head space 214 and environment, a gas stream through the separator 216 takes place, so that filling transported in the gas stream remains in particular in the recesses 216a of the meandering fluidic structure of the separator 216.

Embodiments of bag package are, for example, tube or stand-up bag packages. Stand-up bag packages are used, for example, for packaging olives, animal food, soft drinks, liquid detergents, liquid soap and other goods.

In the case of bag packages, a positive pressure with respect to the environment can result in the internal space merely by handling the same, for example by squeezing the package when holding same. If the package is opened, for example torn open at the provided tear- open position 206, filling can be discharged directly at this position. For avoiding this, the separator 216 is provided between the tear-open opening 206 and the head space 214 in embodiments of the invention. Apart from the embodiment shown in Fig. 13, different implementation options exist for the head space and separator. In a preferred case, head space and separator are filled with gas, so that when the package is opened pressure compensation takes place by the streaming out of gas. In another case it is possible that the head space and the separator of the package are not filled, neither with gas nor with filling, but that the same consists of an extendable structure that is not filled during packaging. This structure can be separated from the filling by a fluidic bottleneck. In this way, the extendable structure is first filled with filling by the increased pressure on the filling when opening the package, which results in pressure compensation. Thus, during opening, little or no filling leaves the tear-open opening. With liquid fillings it can be advantageous to deposit the level of the head space vent below the tear-off line, as is shown in the embodiment in Fig. 13, wherein the head space vent is deposited below the tear-open line by the distance Ah. Thus, embodiments of the present invention provide a package, a packaging unit or parts thereof implemented such that filling is held back during opening of the packaging unit by at least one separator, in order to prevent, for example, discharge of the filling into the environment. In embodiments of the invention, the separator can be implemented as an integral part of the package. In embodiments, the separator can be located between the internal space of the packaging unit and the primary opening location of the packaging unit, which can be referred to as valve. The separator can be implemented as a structure integrated in the container, for example as recess in the container part in contact with the lid or closure, for example in the sealing edge. In embodiments, the separator can be implemented as a structure integrated in the lid or closure of the package. Alternatively, the separator can be implemented as a structure integrated in the container and in the lid or closure of the package. In embodiments of the invention, a channel coming from the separator leads to a primary, i.e. initial, opening location of the package, so that when the package is opened this channel is first connected to the environment even before the package opening provided for taking out the filling is opened. In embodiments of the invention, a channel coming from the separator ends below a pull- off tab of a peelable lid, so that when the lid is pulled open the same is connected to the environment even before further pulling the lid open opens the head space of the packaging unit. In embodiments of the invention, a channel coming from the separator ends at a tear- open position of a bag, such that the same is connected to the environment during tearing open, even before the internal space of the bag package is directly connected to the environment by further tearing open the package. In alternative embodiments of the invention, in a container closed by a cork, a plug or a screw-on lid, a channel coming from the separator is first connected to the environment when the lid is opened, even before the container is opened by completely opening the lid.

In embodiments of the invention, a head space vent is connected to the separator via at least one capillary and/or at least one geometric valve in order to prevent filling the separator with filling in the closed state of the packaging unit. In embodiments of the invention, the separator is implemented according to the principle of a centrifugal separator comprising at least one area where preferably filling having higher density is held back, which has been separated from streaming-out gas with lower density, as well as at least one area where preferably gas can stream and leave the package. In embodiments of the invention, the separator is implemented as a filter separating solid or liquid filling from escaping gas, or as an absorbing matrix that can take up liquid, or as a capillary structure holding the liquid back by capillary forces. In alternative embodiments of the invention, the separator is implemented as an expandable chamber that can receive filling by unfolding or expansion when the pressure in the package increases, in particular in bag packages.

In embodiments of the invention, the separator can include mechanical elements or materials, in particular surface-active substances destroying escaping foam in order to be able to separate the liquid part from escaping gas. In embodiments of the invention, a capillary fluid channel connecting the internal space with the separator and/or fluidic structures of the separator can have an asymmetrical profile in order to ease the formation of a gas stream through areas closed at first by capillary adhered filling, for example liquid. In embodiments of the invention, the package is a package of the group consisting of tube bag packages, stand-up bag packages, cup packages, beverage cartons and bottles. Embodiments of the invention provide a packaging unit of a respective package and a filling that can be liquid, powdery and/or granulated. In embodiments of the invention, the filling can include one of the following: dairy products, in particular condensed milk, coffee cream, kefir, probiotic beverages, drinking yoghurt, yoghurt, buttermilk, curdled milk, whey, soy milk, water, effervescent liquids, such as fizzy drinks, in particular lemonade, beer and sparkling wine, animal food, in particular dog or cat food, lemon juice, cheese, cottage cheese, sausage, tofu, fruit cocktails, ready-made food, baby food, soups, sauces, soy sauce, dips, tomato puree and preparations thereof, salad dressing, olives in oil, pickled herring, technical oils, cleaning detergents, fuel additives, toner, plaster, paints, medicine, agents, glues, super glues, two-component glues, further reagents and chemicals. Obviously, the filling is not limited to the above-mentioned fillings, but embodiments of the invention can be used for packaging almost any liquid, powdery or granulated fillings. A packaging unit can mean a package including filling. A package can mean a container and lid without filling, wherein container and lid can also be realized in a monolithic package, for example a bag package where a tear-open opening is provided allowing separation of a lid part from a container part. A container can be the part of the package receiving the filling, e.g. a cup, bottle, dish or bag. A lid or peelable lid can be the part of the package closing the container, which can be implemented as peelable lid, screw-on lid, clamp-on lid or tear-off lid. In packages consisting of container and lid, a sealing edge can be the area of the container which is suitable to be in contact with a lid, wherein the lid can be connected to parts of the sealing edge of the cup by a thermal process or by glue. The connected area can be designated as a sealing joint. Filling can be the contents to be put in circulation and hence the contents of the package to be taken out of the package, which can, for example, be in the form of powder, liquid, paste or a mixture of liquid and solid material. Head space is the part of the package which does not contain filling, wherein the head space can be filled with air or a protective gas and can also be empty, i.e. does not have to contain either filling or gas. A gas stream is the gas streaming into the environment from the head space of the package when the lid is opened, provided the pressure within the package is higher than the environmental pressure. A head space vent can be the location at the border of upper cup edge and lid where the streaming-out gas first leaves the head space after the initial opening location is opened or after the lid is opened. The initial opening location or valve can be the fluidically functional part of the packaging unit allowing pressure compensation between the head space and the environment after activation. Spandrel liquid can be liquid consisting of filling or a fraction of the filling, e.g. condensate within the transition area between upper container edge and lid and is usually held there by capillary forces. A capillary fluid channel or capillary is a channel filled with liquid by capillary forces. The term geometric valve is an expansion of a capillary where a capillary filling process stops. The term foam destroyer can be a mechanical arrangement or surface-active substance resulting in coalescence of the liquid phase when in contact with foam and in this way releasing the enclosed gas phase.

A separator can be a functional element allowing pressure compensation between package and environment without discharging filling into the environment. The filling can be held back in different ways, wherein here different separator concepts known to a person skilled in the art can be used, wherein separators separating filling carried along by a gas stream include centrifugal separators and filters.

According to the invention, pressure compensation between internal space and environment takes place during an opening process for opening a withdrawal opening of the package in order to withdraw filling from the package. Thus, pressure compensation takes place when a closure closing a withdrawal opening is opened, i.e. for example when the lid is pulled open, when a bag is torn open along a tear-open line or when a cork is pulled out of a bottle. Thus, it can effectively be prevented that filling is already brought into contact with the environment during storage. More precisely, pressure compensation takes place after the beginning of the opening process, but before the withdrawal opening is actually opened. The opening process can thus represent a single intuitive handling step by which the package is opened by the user for withdrawing the filling. For example, this can take place by a single opening movement, by which, first, opening of a primary opening location (whereby pressure compensation takes place, so that, no filling will be discharged in the subsequent course of the opening process) and, second, opening of at least one secondary opening location (withdrawal opening) for withdrawing the filling is effected. In embodiments of the invention, the package is thus implemented such that opening the primary and secondary opening locations can be performed intuitively in one handling step, so that the user perceives no difference to opening a conventional package. This is shown schematically in Fig. 14A for one embodiment, where the separator 26 is arranged between primary opening location 24 and internal space 12 of the container 10, and is shown in Fig. 14B for an embodiment where the primary opening location 24 is arranged between separator and internal space 12 of the container 10. The opening movement is shown in Figs. 14A and 14B by an arrow 300. In this opening movement (for example at a first time ti) first the primary opening location 24 (representing a vent opening) and subsequently (for example at a later second time t₂) the secondary opening location 302 representing the withdrawal opening is opened. Via the withdrawal opening, filling can be withdrawn, as is indicated by arrows 304 in Figs. 14A and 14B.

Thus, withdrawal of the filling does not take place via the primary opening location but via the secondary opening location. In other words, the vent takes place via a vent path separate from the secondary opening location, i.e. the withdrawal opening. The withdrawal opening can be implemented to be sufficiently large in order to be able to withdraw lumpy filling or in order to be able to introduce a withdrawal instrument. If positive pressure exists in the package, venting takes place by a gas stream through the vent path. In embodiments of the invention, the withdrawal opening is significantly larger than the primary opening location, i.e. the vent opening via which pressure compensation takes place. The withdrawal opening can, for example, be at least 10 times, 50 times, 100 times or 1000 times as large as the vent opening. In embodiments of the invention, the separator is arranged such that the gas stream flows through the same. In embodiments, the separator can be arranged in the vent path. In embodiments, several primary opening locations can be provided, such as in Fig. 10, where two primary opening locations are provided.

In embodiments of an inventive package, areas of the first package portion and the second package portion are connected in an overlapping area in the closed state of the package, wherein the separator comprises structures formed in the overlapping area in the first package portion and/or the second package portion. In such embodiments, the areas of the first package portion and the second package portion connected in the overlapping area can be separated from each other when opening the package for withdrawing filling through the withdrawal opening. The overlapping area where the package portions (e.g. a closure and a container) are connected, can also be referred to as a sealing area. This is schematically shown in Figs. 15A to 15C.

Fig. 15A schematically shows a cross-sectional illustration showing a cork 318 in a bottleneck 319 as well as a schematic view of the cork 318. A separator 320 is formed in the cork 318. A sealing area 322 is formed between cork 318 and bottle neck 319, where cork and bottle neck are connected. Further, in the right part of Fig. 15 A, the cork 318 is shown, wherein it can be seen that structures of the separator 320 can be formed in the surface of the cork 318 and are hence arranged in the sealing area. Fig. 15B schematically shows a cross-sectional view of a cup with a tear-open lid 324, wherein an upper edge of the cup is shown schematically and referred to with reference number 326. A sealing area 328 lies between the upper edge of the cup 326 and the peelable lid 324. A separator 330 is provided integrated in the sealing area or the sealing surface. In the same way, a separator could be provided in a sealing area between a screw- on lid and a bottle neck.

Finally, Fig. 15C shows a schematic illustration of a bag package where an overlapping area (sealing area) of two bag foils where the same are connected is illustrated by black squares 340. Thus, the upper portion of the bag package represents a sealing edge or a sealing area in which a separator 346 is integrated. In embodiments, the bag is opened by tearing open the bag package along line 350 so that the initial opening location (vent opening) is at 342 and the withdrawal opening at 344. Insofar, the bag package can correspond to the package shown in Fig. 13. Here, the sealing area in which the separator 346 is integrated is completely removed or destroyed. In alternative embodiments^ the bag could be torn open by separating the two bag foils from one another area by area, such that the initial opening location (vent opening) is at 342 and the second opening location (withdrawal opening) at 344.

Thus, in embodiments of the invention a packaging unit can include an opening location (withdrawal opening) at one location where two package portions (container components) meet at a sealing area. During opening, the two container components are separated from one another at the opening location in the sealing area. In alternative embodiments, the whole sealing area can be destroyed, for example in alternative tube bag packages.

In embodiments of the invention, the package can be implemented by using materials such that the same has barrier characteristics, so that there is no continuous gas exchange with the environment and the package is suitable for long-term storage during which the package remains inert. Apart from that, embodiments of the inventive package are also suitable for storing and withdrawing liquid, lumpy and solid or powdery fillings. Further, embodiments allow the storage of the package in any orientation, wherein even continuous inclined storage does not result in a failure of the functional principle. In embodiments, fluidic structures of the separator can have a larger flow cross-section than the pore size of wet filters, for example a flow cross-section of more than 1 μιη, 10 μιη or 100 μπι, so that a positive pressure can be quickly released and no significant residual pressure with respect to the environment remains during venting. Embodiments of the invention allow the described functionality without a significant increase in the production cost of the package. Thus, integrating a groove into the sealing edge requires a modified forming die for manufacturing a cup, but the process and materials used for the manufacture and sealing of the cup are identical to conventional designs and are thus cost-effective. The same applies to the formation of the sealing joint of a tube bag package, since the formation of the sealing joint to implement a separator and hence pressure compensation does not change the production costs.

Claims

Package, comprising: a first package portion (10; 30; 152; 202) comprising an internal space (12; 36; 160; 213) for holding filling (16; 50; 76; 212); and a second package portion (20; 34; 150; 204) enclosing the internal space (12; 36; 160; 213) in a fluid-tight manner in a closed state of the package and allowing withdrawal of the filling (16; 50; 76; 212) from the package through a withdrawal opening in an opened state of the package, wherein the second package portion (20; 34; 150; 204) is implemented such that when opening the package for withdrawing filling through the withdrawal opening a fluidic connection is generated between internal space (12; 36; 160; 213) and environment at an initial opening location (24; 58; 98; 138; 140; 164; 220) by a vent path separate from the withdrawal opening before the withdrawal opening of the package provided for withdrawing the filling is opened by the opening, wherein a separator (26; 42; 130; 134; 154; 216) is provided allowing discharge of gas from the internal space (12; 36; 160; 213) when opening the package and thereby pressure compensation between internal space and environment and preventing discharge of filling (16; 50; 76; 212) during pressure compensation.

Package according to claim 1, wherein the separator (26; 42; 130; 134; 154; 216) is provided between internal space (12; 36; 160; 213) and primary opening location (24; 58; 98; 138; 140; 164; 220), or wherein the primary opening location is provided between internal space and separator.

Package according to one of claims 1 or 2, wherein the separator (26; 42; 130; 134; 154; 216) is integrated in the first package portion and/or the second package portion.

Package according to one of claims 1 to 3, wherein the separator (42) is implemented as centrifugal separator comprising a fluid channel between internal space (36) and primary opening location (58; 98) having such a course that the filling is separated from gas and held back due to its higher density.

Package according to claim 4, wherein the separator comprises an arcuate channel (108) having at least one bulge (106) in a radial outer portion for receiving filling (104).

Package according to one of claims 1 to 3, wherein the separator comprises a filter or an absorbent matrix.

Package according to one of claims 1 to 3, wherein the separator comprises a filling reception area whose volume is pressure-dependent.

Package according to one of claims 1 to 7, wherein the separator comprises mechanical elements or materials for destroying foam.

Package according to one of claims 1 to 8, wherein the separator (216) comprises a fluid channel having a meandering course, wherein a bulge (216a) for receiving filling is located at at least one impingement slope of the meandering course.

Package according to one of claims 1 to 9, wherein the first package portion comprises a container (30) having an opening and a sealing edge (32) adjacent to the opening, wherein the second package portion comprises a lid (34) overlapping the sealing edge (32) in the closed state and being connected to the same.

Package according to claim 10, wherein the separator (42) comprises a fluid channel formed in the overlapping area of sealing edge (32) and lid (34) by structures in the sealing edge (32) and/or the lid (34), which leads into the internal space (36).

Package according to claim 11, wherein the lid (34) is a peelable lid having a pull- open tab (40), wherein a portion (48) of the fluid channel is arranged in the area of the pull-open tab (40), so that when the lid (34) is pulled open the fluid channel (48) is first fluidically connected to the environment in the area of the pull-open tab (40).

Package according to claim 12, wherein a position (82; 94; 1 10) where the fluid channel (44; 46; 64; 92; 108) leads into the internal space (36) is arranged in a range of angles of 0° ± 45° in relation to the pull-open tab (40), wherein 0° defines the position of the pull-open tab (40) and 360° corresponds to a complete circulation around the sealing edge (32).

14. Package according to one of claims 10 to 13, wherein the opening is circular and the fluid channel (46; 108) extends at least partially around the periphery of the opening.

15. Package according to one of claims 1 to 8, wherein the first package portion (202) and the second package portion (204) form a bag package (200) comprising a predetermined breaking point at a tear-open opening (206), wherein the tear-open opening (206) defines the initial opening location (220).

16. Package according to one of claims 1 to 8, wherein the first package portion (152) comprises a container and the second package portion (150; 150') comprises a cork, a plug or a screw-on lid for closing and/or opening the container, wherein the separator is provided in the second package portion (150; 150') and is coupled, via fluid channels (156, 162), to a first opening (158) and a second opening (164) in the second package portion (150; 150'), wherein the first opening (158) is fluidically connected to the internal space (160) in the closed state, and the second opening is closed by the first package portion (152) in the closed state, and wherein the second opening (164) forms the initial opening location when the package is opened.

17. Package according to claim 16, wherein the container is a bottle.

18. Package according to one of claims 1 to 17, wherein the separator is fluidically coupled to the internal space via a capillary fluid channel (44; 66; 92; 218), wherein the capillary fluid channel and a fluidic structure of the separator into which the same leads form a geometric valve preventing filling of the separator with filling in the closed state of the package.

19. Package according to claim 18, wherein the capillary fluid channel (44; 66; 92;

218) and the separator form a hydro pneumatic valve.

20. Package according to one of claims 18 or 19, wherein the capillary fluid channel and/or fluidic structures of the separator comprise an asymmetric flow cross- section.

21. Package according to one of claims 1 to 20, wherein two separators (130; 134) are provided which are connected fluidically in parallel.

22. Package according to one of claims 1 to 21, wherein areas of the first package portion (10; 30; 152; 202) and the second package portion (20; 34; 150; 204) in the closed state of the package are connected in an overlapping area, wherein the separator comprises structures formed in the overlapping area in the first package portion and/or the second package portion.

23. Package according to claim 21 , wherein the areas of the first package portion and the second package portion connected in the overlapping area are separated from each other when the package is opened for withdrawing filling through the withdrawal opening.

24. Packaging unit comprising a package according to one of claims 1 to 23 and a liquid, powdery or granulated filling located in the internal space.

25. Packaging unit according to claim 24, wherein, apart from the filling, gas is located in the internal space.

26. Packaging unit according to one of claims 24 or 25, wherein the filling is selected from the group consisting of dairy products, in particular condensed milk, coffee cream, kefir, probiotic beverages, drinking yoghurt, yoghurt, buttermilk, curdled milk, whey, soy milk, water, effervescent liquids such as fizzy drinks, in particular lemonade, beer and sparkling wine, animal food, in particular dog or cat food, lemon juice, cheese, cottage cheese, sausage, tofu, fruit cocktails, ready-made food, baby food, soups, sauces, soy sauce, dips, tomato puree and preparations thereof, salad dressing, olives in oil, pickled herring, technical oils, cleaning detergents, fuel additives, toner, plaster, paints, medicine, agents, glues, super glues, two- component glues, reagents, chemicals.