EP1184284B1 - Method of packaging goods containing a liquid element - Google Patents
Method of packaging goods containing a liquid element Download PDFInfo
- Publication number
- EP1184284B1 EP1184284B1 EP00307583A EP00307583A EP1184284B1 EP 1184284 B1 EP1184284 B1 EP 1184284B1 EP 00307583 A EP00307583 A EP 00307583A EP 00307583 A EP00307583 A EP 00307583A EP 1184284 B1 EP1184284 B1 EP 1184284B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- liquid element
- vacuum packing
- vacuum
- subjected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
Definitions
- the present invention relates to a method of packaging goods.
- the present invention relates to methods of vacuum packaging goods.
- a basic vacuum packing process for packaging a foodstuff for example coffee, comprises placing the foodstuff inside a plastic pouch, placing the pouch inside the cavity of a vacuum packer, and removing the air from the cavity by means of the vacuum pump. The pouch is then sealed whilst it remains in the evacuated cavity in order to maintain a vacuum inside the pouch.
- the shelf life of foodstuffs can be greatly enhanced by using this method of packaging.
- Gas flushing vacuum packing involves placing the foodstuff in a container and placing the container in the cavity of a vacuum packer. Again the cavity is evacuated by means of the vacuum pump of the packer. In this case though, before the container is sealed, the cavity of the vacuum packer is filled with an inert gas, for example, helium, argon, nitrogen or carbon dioxide or mixtures thereof. The amount of inert gas supplied to the cavity is generally sufficient to return the pressure inside the cavity to at or around atmospheric pressure, but this can be varied as required. The container is then sealed whilst in the inert gas atmosphere, thereby providing a sealed container in which the foodstuff is stored in an inert atmosphere. Gas flushing vacuum packing is often used to package fresh meat, for example, and is advantageous in that is can prolong the shelf life of refrigerated foodstuffs.
- liquid element we mean the portion of the goods which are in a liquid state and are separable from and not a component part of any solid element of the goods.
- US-A-5 384 147 discloses a method of packaging according to the pre-characterising portion of claim 1.
- any dissolved gases in the liquid come out of solution into the gaseous state and escape in the form of bubbles which burst allowing the gas to escape.
- the liquid stops bubbling.
- the length of time taken to remove substantially all of the dissolved gases from the liquid will vary depending upon the composition of the liquid, the viscosity of the liquid, the volume of liquid and the exposed surface area of the liquid held in the container, amongst other things.
- the volume of the liquid increases during the gas removal process whilst the bubbles of gas escape.
- the size of the bubbles increases. Therefore, the volume of a viscous liquid will increase more during the gas removal process than would the volume of a less viscous liquid.
- liquid elements comprising a particularly viscous liquid which comprises a plurality of component liquids, for example a cream based sauce for food
- a cream based sauce for food it may be advantageous to subject the component parts of the liquid element to separate gas removal processes.
- the white wine and the cream are advantageously subjected to separate gas removal processes before being combined together for the vacuum packing process.
- the container holding the liquid has a volume of at least twice, preferably at least three times, more preferably at least four times and most preferably at least five times, the volume of the liquid being subjected to the gas removal process.
- the container is shaped such that the exposed surface area of the liquid when held in the container is greater than the depth of liquid.
- the exposed surface area of the liquid is at least twice, preferably at least three times, more preferably at least six times and most preferably at least ten times the depth of the liquid.
- the gas removal process requires evacuation of the cavity for a time of the order of seconds, for example for 20-30 seconds. However, it has been found that evacuation for a longer period is not detrimental to the nature and quality of the liquid. Evacuation until the liquid stops bubbling (to the naked eye) is considered to be the minimum period required.
- the liquid could be subjected to evacuation for an extended period, which extended period is longer than the minimum period.
- This extended period may be up to 120%, is suitably up to 130%, is preferably up to 150%, is more preferably up to 160% and is especially up to 200% or more of the minimum period.
- the cavity of the vacuum packer is evacuated to at least a 90% vacuum, preferably to at least a 95% vacuum, more preferably to at least a 99% vacuum and especially to at least a 99.5% vacuum.
- An alternative gas removal process involves cooking the liquid element, for example, by heating to boiling point.
- this process is not preferred if the object is to provide a product comprising fresh, uncooked food.
- the quality of the sauce will be reduced by cooking before packaging followed by subsequent reheating for consumption.
- the liquid element may be treated by subjecting it to a freezing process prior to the goods being subjected to a vacuum packing process.
- both the liquid element and the solid element may be subjected to freezing before being subjected to the vacuum packing process.
- the liquid element is in a solid form during the vacuum packing process, the dissolved gases in the liquid cannot leave solution and form a gas which escapes during the vacuum packing process. Therefore, the disadvantages of vacuum packing a liquid are avoided.
- the liquid element can be left to melt after packaging.
- An advantage of treating the liquid element by freezing is that again, this process avoids cooking the liquid prior to packaging and thus avoids repeated cooking processes which impair the quality of the food.
- treatment of the liquid element does not involve cooking the liquid element.
- the vacuum packing process of the inventive method may be any conventional vacuum packing process, including a basic vacuum packing process and a gas flushing vacuum packing process.
- a basic vacuum packing process and a gas flushing vacuum packing process.
- suitable basic vacuum packing and gas flushing vacuum packing processes are described above in the section entitled "Background of the Invention".
- Goods packaged in accordance with the present invention comprise a liquid element and a solid element.
- fresh pasta in a pasta sauce or meat in a sauce may be packaged in accordance with the present invention.
- the solid element is suitably treated before vacuum packing such that the intrinsic liquid within the solid element can escape during cooking.
- Suitable methods of treating the solid element include perforating the solid element.
- the surface at least of the solid element is perforated.
- the solid element is perforated at a plurality of locations.
- the perforations may provide a plurality of small holes, through which the liquid can escape as it boils during the cooking process.
- this series of holes is provided by a meat tenderiser as commonly used.
- any means of piercing the solid element may be used. If the said element is perforated at a plurality of locations, the perforations may be applied in a single or a plurality of perforating steps. This method of treating the solid element is particularly appropriate if the method of cooking involves microwave cooking.
- the present invention finds particular advantage in packaging of fresh foodstuffs.
- An advantage of the present invention resides in the fact that fresh, uncooked foodstuffs can be packaged using conventional vacuum packing techniques to provide products which are ready for cooking by any method, including in a conventional oven, in a pressure cooker, by steaming and in a microwave oven. Also, because products of the present inventive method do not have to be cooked before packing, cooking the foods for consumption is the only cooking process to which the food is subjected. Therefore, the quality of the food product is improved because the food need only be subjected to a single cooking process rather than a cooking and separate reheating process.
- liquid element has been subjected to a gas removal process as described above, when the product is cooked for consumption the liquid element does not boil as vigorously. This is particularly advantageous when using microwave cookery techniques. Also, this advantage is particularly evident for more viscous liquids, such as cream based sauces for food.
- the present invention finds particular advantage in the provision of refrigerated foodstuffs, in particular for fresh, uncooked ready meals, having an extended shelf life.
- a sauce for meat is prepared by mixing, white wine, cream, cornflour and other flavourings.
- the sauce is placed in a container, which container has a volume of at least five times the volume of the sauce.
- the container is placed in the cavity of a vacuum packer and the cavity is sealed.
- the vacuum pump is then turned on and the cavity is evacuated to a 99.5% vacuum.
- the sauce bubbles as the dissolved gases in the sauce come out of solution and form a gas, which bubbles burst so that the gases escape from the liquid.
- the evacuation process is carried out for about 40 seconds, which is until about 10 seconds after the liquid has stopped bubbling.
- the container and the liquid is then removed from the cavity of the vacuum packer.
- a proportion of the thus degased sauce is placed into a microwaveable plastic tray.
- a portion of fresh, uncooked chicken is then placed on top of the sauce.
- a further portion of the degased sauce is placed on top of the fresh, uncooked chicken.
- the microwaveable plastic tray is then placed in the cavity of a vacuum packer.
- the cavity is evacuated, again to a 99.5% vacuum.
- a 70:30 wt% mixture of nitrogen:carbon dioxide gas is then supplied to the cavity of the vacuum packer to provide an inert gas atmosphere in the cavity.
- the gas mixture is supplied by BOC, England.
- Sufficient gas is supplied to produce a pressure of about atmospheric pressure in the cavity.
- the container is then sealed using a plastic film, whilst it remains in the cavity in the inert gas atmosphere.
- the container is sealed such that an air tight seal is created.
- the thus packaged food is stored in a refrigerator until required for consumption.
- the package is removed from the refrigerator.
- the film is then pierced and the package is placed in a microwave oven for cooking.
- the cooked food may be removed from the container for serving.
- the microwaveable plastic tray and the plastic film in which the food is packaged may be replaced by an oven proof container and film.
- the packaged food may then be cooked in a conventional oven.
- the packaged food may be removed completely from the container before cooking.
- the chicken may be perforated before placing in the microwaveable plastic tray with the sauce for vacuum packing.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vacuum Packaging (AREA)
- Basic Packing Technique (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
- General Preparation And Processing Of Foods (AREA)
Abstract
Description
- The present invention relates to a method of packaging goods. In particular, but without limitation, the present invention relates to methods of vacuum packaging goods.
- Methods of vacuum packing food are well known. A basic vacuum packing process for packaging a foodstuff, for example coffee, comprises placing the foodstuff inside a plastic pouch, placing the pouch inside the cavity of a vacuum packer, and removing the air from the cavity by means of the vacuum pump. The pouch is then sealed whilst it remains in the evacuated cavity in order to maintain a vacuum inside the pouch. The shelf life of foodstuffs can be greatly enhanced by using this method of packaging.
- It is also known to use gas flushing vacuum packing to pack foodstuffs. Gas flushing vacuum packing involves placing the foodstuff in a container and placing the container in the cavity of a vacuum packer. Again the cavity is evacuated by means of the vacuum pump of the packer. In this case though, before the container is sealed, the cavity of the vacuum packer is filled with an inert gas, for example, helium, argon, nitrogen or carbon dioxide or mixtures thereof. The amount of inert gas supplied to the cavity is generally sufficient to return the pressure inside the cavity to at or around atmospheric pressure, but this can be varied as required. The container is then sealed whilst in the inert gas atmosphere, thereby providing a sealed container in which the foodstuff is stored in an inert atmosphere. Gas flushing vacuum packing is often used to package fresh meat, for example, and is advantageous in that is can prolong the shelf life of refrigerated foodstuffs.
- Whilst the aforementioned methods of packaging are advantageous for packaging solid goods, such as coffee or meat, such methods have not been found suitable for packaging goods comprising a liquid element. By "liquid element" we mean the portion of the goods which are in a liquid state and are separable from and not a component part of any solid element of the goods.
- When goods having a liquid element are subjected to vacuum packing gases, dissolved in the liquid come out of solution, i.e. they form a gas, due to the reduction in pressure. This is a problem, in that in order to operate properly, and provide an airtight seal, it is important that the vacuum packer is kept clean. When the liquid boils, it tends to spray over the inside of the vacuum packer cavity and reduces the effectiveness of the packaging. Furthermore, the majority of the liquid is removed from the goods to be packaged.
-
US-A-5 384 147 discloses a method of packaging according to the pre-characterising portion of claim 1. - It is an object of preferred embodiments of the present invention to provide an improved method of packaging goods.
- A method of packaging foodstuffs having a liquid element and a solid element, said liquid element comprising dissolved gasses, the method comprising the steps of:
- subjecting the liquid element to a gas removal process prior to said foodstuff being subjected to a vacuum packing process characterised in that the liquid element is subjected to the gas removal process before being combined with the solid element of the foodstuff in a single container for the vacuum packing process; and
- vacuum packing the combined liquid element and solid element
- whereby a substantial proportion of said dissolved gases does not escape from said liquid element during said vacuum packing process.
- Further features of the present invention are set out in the appended claims.
- As the cavity is evacuated, any dissolved gases in the liquid come out of solution into the gaseous state and escape in the form of bubbles which burst allowing the gas to escape. When substantially all of the dissolved gases have been removed from the liquid the liquid stops bubbling.
- The length of time taken to remove substantially all of the dissolved gases from the liquid will vary depending upon the composition of the liquid, the viscosity of the liquid, the volume of liquid and the exposed surface area of the liquid held in the container, amongst other things.
- Because the escaping gases form bubbles the volume of the liquid increases during the gas removal process whilst the bubbles of gas escape. As the viscosity of the liquid increases, the size of the bubbles increases. Therefore, the volume of a viscous liquid will increase more during the gas removal process than would the volume of a less viscous liquid.
- For liquid elements comprising a particularly viscous liquid which comprises a plurality of component liquids, for example a cream based sauce for food, it may be advantageous to subject the component parts of the liquid element to separate gas removal processes. For example, in the case of a cream based white wine sauce the white wine and the cream are advantageously subjected to separate gas removal processes before being combined together for the vacuum packing process.
- Suitably, the container holding the liquid has a volume of at least twice, preferably at least three times, more preferably at least four times and most preferably at least five times, the volume of the liquid being subjected to the gas removal process.
- Preferably, the container is shaped such that the exposed surface area of the liquid when held in the container is greater than the depth of liquid. Suitably, the exposed surface area of the liquid is at least twice, preferably at least three times, more preferably at least six times and most preferably at least ten times the depth of the liquid.
- Generally, the gas removal process requires evacuation of the cavity for a time of the order of seconds, for example for 20-30 seconds. However, it has been found that evacuation for a longer period is not detrimental to the nature and quality of the liquid. Evacuation until the liquid stops bubbling (to the naked eye) is considered to be the minimum period required.
- In order to be certain that substantially all of the dissolved gases have been removed from the liquid, the liquid could be subjected to evacuation for an extended period, which extended period is longer than the minimum period. This extended period may be up to 120%, is suitably up to 130%, is preferably up to 150%, is more preferably up to 160% and is especially up to 200% or more of the minimum period.
- Suitably, during the gas removal process, the cavity of the vacuum packer is evacuated to at least a 90% vacuum, preferably to at least a 95% vacuum, more preferably to at least a 99% vacuum and especially to at least a 99.5% vacuum.
- It has been found that the gas removal process outlined above does not affect the flavour or consistency of the liquid element, and because no heat is applied to the liquid element, it remains uncooked during the gas removal process.
- An alternative gas removal process, involves cooking the liquid element, for example, by heating to boiling point. However, this process is not preferred if the object is to provide a product comprising fresh, uncooked food. The quality of the sauce will be reduced by cooking before packaging followed by subsequent reheating for consumption.
- As an alternative to a gas removal process the liquid element may be treated by subjecting it to a freezing process prior to the goods being subjected to a vacuum packing process.
- Suitably, only the liquid element is subjected to freezing. However, both the liquid element and the solid element may be subjected to freezing before being subjected to the vacuum packing process.
- Because the liquid element is in a solid form during the vacuum packing process, the dissolved gases in the liquid cannot leave solution and form a gas which escapes during the vacuum packing process. Therefore, the disadvantages of vacuum packing a liquid are avoided. The liquid element can be left to melt after packaging.
- An advantage of treating the liquid element by freezing is that again, this process avoids cooking the liquid prior to packaging and thus avoids repeated cooking processes which impair the quality of the food.
- Preferably, treatment of the liquid element does not involve cooking the liquid element.
- The vacuum packing process of the inventive method may be any conventional vacuum packing process, including a basic vacuum packing process and a gas flushing vacuum packing process. For example, suitable basic vacuum packing and gas flushing vacuum packing processes are described above in the section entitled "Background of the Invention".
- Goods packaged in accordance with the present invention comprise a liquid element and a solid element. For example, fresh pasta in a pasta sauce or meat in a sauce may be packaged in accordance with the present invention.
- In the case of foodstuffs, if the goods comprise a solid element, which solid element comprises a liquid intrinsic within its structure, for example a piece of meat, the solid element is suitably treated before vacuum packing such that the intrinsic liquid within the solid element can escape during cooking. Suitable methods of treating the solid element include perforating the solid element. Suitably, the surface at least of the solid element is perforated. Preferably, the solid element is perforated at a plurality of locations. The perforations may provide a plurality of small holes, through which the liquid can escape as it boils during the cooking process. Suitably, this series of holes is provided by a meat tenderiser as commonly used. Alternatively, any means of piercing the solid element may be used. If the said element is perforated at a plurality of locations, the perforations may be applied in a single or a plurality of perforating steps. This method of treating the solid element is particularly appropriate if the method of cooking involves microwave cooking.
- When the liquid element which has been treated is subsequently subjected to a vacuum packing process, the liquid element does not boil. Thus, goods treated in accordance with preferred embodiments of the present invention can be packaged using conventional vacuum packing techniques without the disadvantages of the prior art.
- The present invention finds particular advantage in packaging of fresh foodstuffs. An advantage of the present invention resides in the fact that fresh, uncooked foodstuffs can be packaged using conventional vacuum packing techniques to provide products which are ready for cooking by any method, including in a conventional oven, in a pressure cooker, by steaming and in a microwave oven. Also, because products of the present inventive method do not have to be cooked before packing, cooking the foods for consumption is the only cooking process to which the food is subjected. Therefore, the quality of the food product is improved because the food need only be subjected to a single cooking process rather than a cooking and separate reheating process.
- Furthermore, if the liquid element has been subjected to a gas removal process as described above, when the product is cooked for consumption the liquid element does not boil as vigorously. This is particularly advantageous when using microwave cookery techniques. Also, this advantage is particularly evident for more viscous liquids, such as cream based sauces for food.
- The present invention finds particular advantage in the provision of refrigerated foodstuffs, in particular for fresh, uncooked ready meals, having an extended shelf life.
- A sauce for meat is prepared by mixing, white wine, cream, cornflour and other flavourings. The sauce is placed in a container, which container has a volume of at least five times the volume of the sauce.
- The container is placed in the cavity of a vacuum packer and the cavity is sealed. The vacuum pump is then turned on and the cavity is evacuated to a 99.5% vacuum. As the cavity is evacuated the sauce bubbles as the dissolved gases in the sauce come out of solution and form a gas, which bubbles burst so that the gases escape from the liquid. The evacuation process is carried out for about 40 seconds, which is until about 10 seconds after the liquid has stopped bubbling.
- The container and the liquid is then removed from the cavity of the vacuum packer.
A proportion of the thus degased sauce is placed into a microwaveable plastic tray. A portion of fresh, uncooked chicken is then placed on top of the sauce. A further portion of the degased sauce is placed on top of the fresh, uncooked chicken.
The microwaveable plastic tray is then placed in the cavity of a vacuum packer. The cavity is evacuated, again to a 99.5% vacuum. A 70:30 wt% mixture of nitrogen:carbon dioxide gas is then supplied to the cavity of the vacuum packer to provide an inert gas atmosphere in the cavity. The gas mixture is supplied by BOC, England. Sufficient gas is supplied to produce a pressure of about atmospheric pressure in the cavity. The container is then sealed using a plastic film, whilst it remains in the cavity in the inert gas atmosphere. The container is sealed such that an air tight seal is created. - The thus packaged food is stored in a refrigerator until required for consumption. To cook the food, the package is removed from the refrigerator. The film is then pierced and the package is placed in a microwave oven for cooking. The cooked food may be removed from the container for serving.
- Alternatively, the microwaveable plastic tray and the plastic film in which the food is packaged may be replaced by an oven proof container and film. The packaged food may then be cooked in a conventional oven.
- Alternatively, the packaged food may be removed completely from the container before cooking.
- Alternatively, the chicken may be perforated before placing in the microwaveable plastic tray with the sauce for vacuum packing.
Claims (4)
- A method of packaging foodstuffs having a liquid element and a solid element, said liquid element comprising dissolved gases, the method comprising the steps of:subjecting the liquid element to a gas removal process prior to said foodstuff being subjected to a vacuum packing process characterised in that the liquid element is subjected to the gas removal process before being combined with the solid element of the foodstuff in a single container for the vacuum packing process; andvacuum packing the combined liquid element and solid elementwhereby a substantial proportion of said dissolved gases does not escape from said liquid element during said vacuum packing process.
- A method in accordance with Claim 1, wherein the said gas removal process comprises subjecting said liquid element to an evacuation process in a vacuum packer.
- A method in accordance with any one of Claims 1 or 2 wherein the said gas removal process removes substantially all of the dissolved gases from the liquid element.
- A method according to any preceding claim, wherein said solid element is perforated before said goods are subjected to said vacuum packing process.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT00307583T ATE367968T1 (en) | 2000-09-04 | 2000-09-04 | METHOD FOR PACKAGING FILLING PRODUCT CONTAINING A LIQUID ELEMENT |
EP00307583A EP1184284B1 (en) | 2000-09-04 | 2000-09-04 | Method of packaging goods containing a liquid element |
DE60035684T DE60035684T2 (en) | 2000-09-04 | 2000-09-04 | Process for packaging of a liquid element containing contents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00307583A EP1184284B1 (en) | 2000-09-04 | 2000-09-04 | Method of packaging goods containing a liquid element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1184284A1 EP1184284A1 (en) | 2002-03-06 |
EP1184284B1 true EP1184284B1 (en) | 2007-07-25 |
Family
ID=8173238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00307583A Expired - Lifetime EP1184284B1 (en) | 2000-09-04 | 2000-09-04 | Method of packaging goods containing a liquid element |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1184284B1 (en) |
AT (1) | ATE367968T1 (en) |
DE (1) | DE60035684T2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5575827B2 (en) * | 2012-03-27 | 2014-08-20 | 株式会社Tosei | Vacuum packaging method and vacuum packaging apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU39230A1 (en) * | 1960-09-29 | 1962-03-29 | ||
IL102782A0 (en) * | 1991-08-16 | 1993-01-31 | Int Equipment Sales Inc | Method for processing avocado pulp |
-
2000
- 2000-09-04 AT AT00307583T patent/ATE367968T1/en not_active IP Right Cessation
- 2000-09-04 DE DE60035684T patent/DE60035684T2/en not_active Expired - Fee Related
- 2000-09-04 EP EP00307583A patent/EP1184284B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60035684D1 (en) | 2007-09-06 |
DE60035684T2 (en) | 2008-04-30 |
EP1184284A1 (en) | 2002-03-06 |
ATE367968T1 (en) | 2007-08-15 |
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