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US20110248035A1 - Bag-in-container with prepressurized space between inner bag and outer container - Google Patents

Bag-in-container with prepressurized space between inner bag and outer container Download PDF

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Publication number
US20110248035A1
US20110248035A1 US13/119,799 US200913119799A US2011248035A1 US 20110248035 A1 US20110248035 A1 US 20110248035A1 US 200913119799 A US200913119799 A US 200913119799A US 2011248035 A1 US2011248035 A1 US 2011248035A1
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US
United States
Prior art keywords
bag
space
container
gas
pressure
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.)
Abandoned
Application number
US13/119,799
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English (en)
Inventor
Daniel Peirsman
Sarah Vanhove
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anheuser Busch InBev SA
Original Assignee
Anheuser Busch InBev SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Anheuser Busch InBev SA filed Critical Anheuser Busch InBev SA
Assigned to ANHEUSER-BUSCH INBEV S.A. reassignment ANHEUSER-BUSCH INBEV S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PEIRSMAN, DANIEL, VANHOVE, SARAH
Publication of US20110248035A1 publication Critical patent/US20110248035A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D1/00—Apparatus or devices for dispensing beverages on draught
    • B67D1/04—Apparatus utilising compressed air or other gas acting directly or indirectly on beverages in storage containers
    • B67D1/0462—Squeezing collapsible or flexible beverage containers, e.g. bag-in-box containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D1/00—Apparatus or devices for dispensing beverages on draught
    • B67D1/08—Details
    • B67D1/0801—Details of beverage containers, e.g. casks, kegs
    • B67D2001/0827—Bags in box
    • B67D2001/0828—Bags in box in pressurised housing

Definitions

  • the present invention relates in general to new developments in dispensing bag-in-containers and, in particular, to bag-in-containers wherein dispensing of the fluid contained therein is driven by the application of a fluid compressive pressure to the inner bag.
  • Bag-in-containers also referred to as bag-in-bottles or bag-in-boxes depending on the geometry of the outer vessel, all terms considered herein as being comprised within the meaning of the term bag-in-container, are a family of liquid dispensing packaging consisting of an outer container comprising an opening to the atmosphere—the mouth—and which contains a collapsible inner bag joined to said container.
  • the fluid to be dispensed for example a beverage, is contained in said bag and dispensing of said fluid can be driven by any of the following techniques.
  • technique (b) of storing a pressurized gas in the space between the inner bag and outer container, said space being thereafter sealed solves most drawbacks of the former technique, but yields other drawbacks, in particular that:
  • the present invention proposes an original solution that solves the problems of both techniques (a) and (b) whilst cumulating their respective advantages.
  • the present invention is defined in the appended independent claims. Preferred embodiments are defined in the dependent claims.
  • the present invention relates to bag-in-containers comprising an inner layer forming a bag filled with a fluid, said bag being separatable from an outer layer forming the container, and further comprising a mouth fluidly connecting the volume defined by the bag to the atmosphere and separated therefrom by sealing means, said container further comprising at least one space vent fluidly connecting the space between inner and outer layers to the atmosphere.
  • Bag-in-containers comprising such vents are suitable for dispensing techniques comprising injection of a pressurized gas through said vents to drive the liquid out of the bag.
  • vents can also be used in techniques where the liquid is sucked out of the bag in order to balance the pressure in the space with the atmosphere as the bag volume decreases, but said vents are simple holes and comprise no closing means and cannot be connected to a source of pressurized gas. In the present invention, only vents connectable to a source of pressurized gas are contemplated and must furthermore comprise closing means able to control the gas flow between the space and the atmosphere.
  • the space between the inner bag and outer container of the bag-in-container of the present invention contains an amount of gas (V S,i ) at a pressure (P i ) insufficient to compress the bag to drive out more than 80% of the fluid contained therein.
  • the present invention also concerns a kit of parts comprising a bag-in-container as described above and an appliance to accommodate the bag-in-container and comprising a dispensing duct with means for connecting it to the mouth of the bag-in-container and an external source of pressurized gas with means for connecting it to a vent and for cooperating with the closing means, when additional pressure is required to drive the fluid out of the inner bag.
  • the closing means open when the pressure in the space falls below a given value.
  • the closing means open when the external pressure is higher by a given value than the pressure in the space.
  • the closing means may be opened by puncturing it upon connecting the vent to an external source of pressurized gas.
  • the gas stored in the space between the inner bag and outer container is at an initial pressure (P i ) (i.e., when the inner bag is fully filled and none of the fluid it contains has been dispensed) comprised between 0.1 and 6.0 bar, preferably between 0.1 and 4.0 bar, most preferably between 0.5 and 3.0 bar.
  • the normalized space volume (V S,i /V C ), wherein V S,i is the initial volume of said space (or of the gas at a pressure P i ) and V C is the container's volume, should be as low as possible in order to minimize the size of the outer container and should be less than 10%, preferably less than 5%, most preferably less than 0.1%.
  • the initial volume (V S,i ) of the space can be close to zero, in particular if the bag-in-container is produced by integrally blowmoulding two polymeric preforms together, resulting in a container consisting of two separatable layers joined by a weak interface.
  • the interface between inner and outer layers of integrally blowmoulded bag-in-containers is usually disrupted by the end-user by injecting gas therebetween through the vent upon dispensing the fluid contained in the inner bag.
  • the layer separation is not always as reproducible as could be expected, which could lead to uncontrolled bag collapse and to the formation of pockets full of fluid sealed from the mouth of the bag, and thus to the incomplete dispensing of the fluid.
  • the interface between the two layers is disrupted in a controlled way, ensuring that the bag-in-container will function smoothly and thoroughly when in use, allowing full dispensing of the fluid contained therein. Any leak in the bag may be identified immediately as the inner bag is being filled with fluid and the space is pre-pressurized with gas. Consequently, any bag-in-container with defects at the interface or in the bag can immediately be spotted and rejected upon introducing said amount of pressurizing gas through the interface.
  • Bag-in-containers according to the present invention may be used in a variety of applications, including dispensing of therapeutic fluids, chemicals, etc.
  • a preferred application is for dispensing beverages, carbonated or not, in particular soft drinks and beers.
  • the fluid may be sensitive to oxidization.
  • a gas such as CO 2 or N 2
  • an additional benefit is obtained of prolonging the shelf life of the fluid, as said gas forms a blanket or barrier to oxygen diffusion across the walls of the outer container and the inner bag.
  • FIG. 1 is a cross sectional view of a bag-in-container according to the present invention.
  • FIG. 2 is a graphical representation of the pressure drop upon use in the space between inner bag and outer container of a pre-pressurized bag-in-container.
  • FIG. 3 is a graphical representation of a bag-in-container according to the present invention mounted on a dispensing appliance and ready for use.
  • FIG. 1 there is illustrated a bag-in-container ( 2 ) comprising an inner bag ( 21 ) filled with a fluid ( 10 ) and an outer container ( 22 ) joined at least at the level of the neck region ( 6 ) by an interface (not shown in the Figure).
  • the space ( 24 ) of volume (V S,i ) between the inner bag and outer container ( 21 ) and ( 22 ) is in fluid communication with at least one vent ( 3 ) and is filled with a certain amount of pre-pressurizing gas at a pressure (P i ) stored in the initial space volume (V S,i ) which will be defined below.
  • closing means ( 4 ) suitable for controlling the gas flow across the vent ( 3 ).
  • a closing means is herein considered as controlling the flow across vent ( 3 ) if it can alternate at least once from a closed position preventing any gas flow, to an open position allowing gas flow across vent ( 3 ).
  • a simple stopper or cap usually found in pressurized bag-in-containers is not considered as controlling the flow since its sole function is to seal the pressurized space from the atmosphere.
  • a hole in a bag-in-container used to compensate the pressure in the space with the atmosphere as the inner bag collapses by suction of the fluid contained therein cannot be considered as controlling the flow since it is meant to remain open.
  • Closing means ( 4 ) may be a valve which can be operated either manually, or automatically as a function of the pressure inside the space ( 24 ). Alternatively, the closing means ( 4 ) may be punctured open upon mounting the bag-in-container in its corresponding dispensing appliance.
  • closing means ( 4 ) may be a simple cap made of an elastomeric material like rubber. The elastomeric cap or stopper may comprise a thinner section to either facilitate puncturing thereof, or to break open when the pressure difference between the space ( 24 ) and the gas source ( 103 ) reaches a preset value.
  • vents ( 3 ) and corresponding closing means ( 4 ) are located adjacent to, and oriented coaxially with mouth ( 5 ), in order to simplify the mounting of the bag-in-container onto the dispensing appliance (cf. FIG. 3 ).
  • the bag-in-containers according to the present invention may be manufactured by any method known in the art.
  • the interface may be further weakened by applying a release agent on either or both surfaces of the inner and outer preforms, which are to form the interface of the bag-in-container.
  • a release agent Any release agents available on the market and best adapted to the material used for the preform and resisting the blowing temperatures, like silicon- or PTFE-based release agents (e.g., Freekote) may be used.
  • the release agent may be applied just prior to loading the preforms into the blowmoulding unit, or the preforms may be supplied pretreated.
  • the interface may be weakened upon blowmoulding the bag-in-container, also when preforms with no air gap between inner and outer preforms are used, by blowing a fraction of the pressurized fluid used between the two preforms to prevent intimate contact between the inner and outer layers and thus preventing the formation of a strong interface between the two layers.
  • the fraction of pressurized fluid injected between the two preforms must be carefully metered such that sufficient fluid is injected to form a thin fluid cushion between the two layers, but any excess leading to a poor blowing of the inner bag should be avoided. The proper ratio can easily be assessed with a series of tuning tests.
  • Preferred materials for the bag-in-container of the present invention are polyesters like PET, PEN, PTT, PTN; polyamides like PA6, PA66, PA11, PA12; polyolefins like PE, PP; EVOH; biodegradable polymers like polyglycol acetate (PGAc), polylactic acid (PLA); and copolymers and blends thereof.
  • their optimal blow-moulding temperatures should not differ from one another by more than about 70° C., preferably 40° C., most preferably 10° C., and ideally should have the same blow-moulding temperature.
  • the layer's temperatures may be determined by IR-measurement.
  • the at least one vent ( 3 ) preferably is in the shape of a wedge with the broad side at the level of the opening thereof, where the closing means ( 4 ) is located, and getting thinner as it penetrates deeper into the vessel, until the two layers meet to form an interface ( 24 ) at least at the level of the neck region.
  • the container may comprise one or several vents evenly distributed around the lip of the bag-in-container's mouth. Several vents are advantageous as they permit the interface of the inner and outer layers ( 21 ) and ( 22 ) of the bag-in-container ( 2 ) to release more evenly upon blowing pressurized gas through said vents.
  • the preform comprises two vents opening at the vessel's mouth lip at diametrically opposed positions. More preferably, three, and most preferably, at least four vents open at regular intervals of the mouth lip.
  • a fluid compressive force may be applied to the inner bag of a bag-in-container to literally “squeeze” the fluid out of the bag, either:
  • cartridges of pressurized (or liquefied) gas are rather expensive and prolonging their service life would certainly be to the benefit of the end-user.
  • down-sizing the pump or compressor required to drive the dispensing of the fluid is advantageous in terms of cost, noise, and bulkiness of the appliance.
  • the initial pressure (P i ) of the pressurizing gas contained in the space ( 24 ) must be high to ensure that sufficient driving force is available to squeeze out substantially all the fluid contained in the bag. It is considered that there is no more driving force available to squeeze the fluid out of the bag, when the pressure (P) in the bag is equal to or lower than the pressure (P 0 ) required to deform the bag and to lift the fluid to be dispensed up to the highest point of the dispensing duct.
  • V S /V C the pressure (P) as a function of the relative space volume (V S /V C ).
  • the initial volume of the space before any beverage was dispensed is characterized by V S,i /V C ; and the the minimal pressure required to compress the bag and drive the fluid out of the bag is represented by P 0 , with corresponding volume of the space, V S,0 /V C .
  • the volume of fluid which cannot be dispensed for insufficient pressure in the space ( 24 ) is simply 1 ⁇ V S,0 /V C .
  • This result would be unacceptable for any pressurized bag-in-container using technique (b) as defined above wherein the pressurized gas is sealed in space ( 24 ).
  • V S,i initial volume of space ( 24 )
  • P i initial pressure
  • the present invention takes profit of the advantages of each of techniques (a) and (b) as defined above, whilst it skips their respective disadvantages. Indeed, the space ( 24 ) of bag-in-containers of the present invention is pre-pressurized with a gas stored therein in a volume (V S,i ) and at a pressure (P i ), which is insufficient to drive out of the inner bag all the fluid contained therein.
  • the missing pressure to drive out of the bag the remaining content of the inner bag (1 ⁇ V S,0 /V C ) is supplied by an external source ( 103 ) of pressurized gas connected to the vents ( 3 ) and in coordination with the closing means ( 4 ) which control the gas flow through the vents.
  • the external source ( 103 ) of pressurized gas may be a pump or compressor, or a pressurized gas cartridge (e.g., liquefied CO 2 cartridge).
  • the initial volume (V S,i ) in which the pre-pressurizing gas is stored should be kept as small as possible in order to reduce the overall size of the container for a given capacity of the inner bag. Preferably it should be restricted to less than 10%, preferably, less than 5%, most preferably, less than 1% of the total container volume (V C ).
  • the ideal initial pressure (P i ) depends on a number of parameters, like the initial relative space volume (V S,i / V C ), the minimal driving pressure (P 0 ) of the system, and the mechanical resistance of the outer container. Generally speaking, the initial pressure (P i ) is comprised between 0.1 and 6.0 bar above atmospheric, preferably between 0.5 and 4.0 bar, most preferably between 1.0 and 3.0 bar.
  • an empty bag-in-container must first be produced in any way known in the art (e.g., producing separately a container and a bag, and inserting the latter into the container or, most preferably, by co-blowmoulding the inner bag and outer container in a single blowmoulding operation as discussed above).
  • the fluid ( 10 ) to be dispensed and the pre-pressurizing gas must then be introduced into the inner bag ( 21 ) and the space ( 24 ), which are the respectively sealed.
  • the bag-in-container of the present invention is to be mounted onto a dispensing appliance ( 100 ) as illustrated in FIG. 3 .
  • a dispensing duct ( 105 ) opening to the atmosphere at ( 107 ) is brought in fluid communication with the interior of the inner bag ( 21 ) through the mouth ( 5 ) of the bag-in-container, while a source of pressurized gas ( 103 ) is brought in fluid communication with the space ( 24 ) through vents ( 3 ) in cooperation with closing means ( 4 ) (in FIG. 3 , only one connection to vent ( 3 ) is shown for sake of clarity).
  • Pressurized gas source ( 103 ) may be a cartridge of pressurized or liquefied gas, such as CO 2 or N 2 , as represented in FIG. 3 , or it may be a pump or compressor (not shown).
  • the dispensing duct ( 105 ) may be provided with a sharp end able to rip open sealing means ( 1 ) separating the interior of the inner bag ( 21 ) from the atmosphere as the mouth ( 5 ) is brought into contact with said end of the dispensing duct ( 105 ) to create a fluid connection therebetween.
  • closing means ( 4 ) may be punctured open by a sharpened end of the duct ( 101 ) to create a fluid communication between the space ( 24 ) and the gas source ( 103 ).
  • closing means ( 4 ) may be a valve connectable to the end of dict ( 101 ).
  • Control valves ( 113 , 115 ) may be provided on both the dispensing duct ( 105 ) and gas duct ( 101 ), respectively, to control, either manually or automatically, the flow of fluid and gas, respectively, when required.
  • additional pressurized gas is injected from gas source ( 103 ) into space ( 24 ) through duct ( 101 ) and vent ( 3 ).
  • the control of gas flow from the gas source to the space ( 24 ) may be provided by the closing means ( 4 ) themselves or, alternatively, by control means such as a pressure valve ( 115 ) disposed between the gas source ( 103 ) and the closing means ( 4 ), which must then be opened, e.g., by puncturing it.
  • closing means ( 4 ) may be adapted to open when the pressure in the space ( 24 ) falls below a given value, such as P/P 0 ⁇ 1.2. Alternatively, it may be adapted to open when the external pressure is higher by a given value than the pressure in the space ( 24 ).
  • the same rules may be applied to control valve ( 115 ) in case closing means ( 4 ) is puncture opened.

Landscapes

  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Devices For Dispensing Beverages (AREA)
  • Packages (AREA)
US13/119,799 2008-09-19 2009-09-15 Bag-in-container with prepressurized space between inner bag and outer container Abandoned US20110248035A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08164706.7 2008-09-19
EP08164706A EP2165968A1 (fr) 2008-09-19 2008-09-19 Bag-in-box doté d'un espace pressurisé entre la poche intérieure et le récipient extérieur
PCT/EP2009/061943 WO2010031764A2 (fr) 2008-09-19 2009-09-15 Système de poche incorporée à un récipient avec espace pré-pressurisé entre la poche interne et le récipient externe

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Publication Number Publication Date
US20110248035A1 true US20110248035A1 (en) 2011-10-13

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US13/119,799 Abandoned US20110248035A1 (en) 2008-09-19 2009-09-15 Bag-in-container with prepressurized space between inner bag and outer container

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US (1) US20110248035A1 (fr)
EP (2) EP2165968A1 (fr)
CN (1) CN102149627B (fr)
AR (1) AR074253A1 (fr)
BR (1) BRPI0913560A2 (fr)
RU (1) RU2526690C2 (fr)
WO (1) WO2010031764A2 (fr)

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BRPI0913560A2 (pt) 2016-09-13
EP2165968A1 (fr) 2010-03-24
WO2010031764A2 (fr) 2010-03-25
CN102149627A (zh) 2011-08-10
RU2526690C2 (ru) 2014-08-27
EP2337759A2 (fr) 2011-06-29
AR074253A1 (es) 2011-01-05
WO2010031764A3 (fr) 2010-10-07
CN102149627B (zh) 2017-02-22

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