WO2003024804A1 - Machine de conditionnement a evacuation de gaz - Google Patents

Machine de conditionnement a evacuation de gaz Download PDF

Info

Publication number
WO2003024804A1
WO2003024804A1 PCT/NZ2002/000178 NZ0200178W WO03024804A1 WO 2003024804 A1 WO2003024804 A1 WO 2003024804A1 NZ 0200178 W NZ0200178 W NZ 0200178W WO 03024804 A1 WO03024804 A1 WO 03024804A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
chamber
machine
nozzle
gas
Prior art date
Application number
PCT/NZ2002/000178
Other languages
English (en)
Inventor
Christopher Hugh Caudwell
Original Assignee
Sealed Air (New Zealand) Limited
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 Sealed Air (New Zealand) Limited filed Critical Sealed Air (New Zealand) Limited
Publication of WO2003024804A1 publication Critical patent/WO2003024804A1/fr

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
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • 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
    • B65B31/04—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
    • B65B31/044—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzles being combined with a filling device

Definitions

  • This invention relates to vacuum packaging machines and more particularly to a vacuum chamber gas flush machine.
  • Such machines are typically used for the packaging of products which are prone to spoilage and are thus used, for example, in the meat industry for packaging meat primals or consumer packs with the intension of extending the shelf life of the meat products.
  • the container can be sealed, this sealing taking place within the chamber and before the chamber is opened.
  • a volume of gas e.g. carbon dioxide
  • a single chamber vacuum packaging machine can be found in New Zealand patent specification 2188186/221180.
  • the packaging machine of this patent specification is described as also including a gas flush function. It is necessary that the volume of gas injected into the flexible container be a known ratio to the weight of the product (which will hereinafter, for convenience, be referred to as "meat") in the container. There is generally known a volume of gas per weight of meat. However, differing ratios are sometimes used especially a lesser ratio when a shorter product life is acceptable.
  • the weight of meat naturally varies from package to package (cut to cut) .
  • the volume of gas is preset prior to a production run to ensure that sufficient gas is used for the heaviest packs. If a significantly lighter pack is included in a production run the machine must be stopped and the gas level reset before and after the light pack is processed through the machine. This results in time wastage.
  • meat of a particular type or weight e.g. lamb legs
  • meat of a different type or weight e.g. lamb shoulders .
  • An object of the present invention is to provide a vacuum chamber gas flush packaging machine which exhibits improved control of the air removal and gas flushing process.
  • a further object of the present invention is to provide a vacuum chamber gas flush packaging machine whereby the volume of gas to be injected into a flexible container can be readily, preferably automatically, adjusted to achieve the desired ratio of gas to the weight of the content of the flexible container.
  • a vacuum chamber gas flush packaging machine including a chamber in which one or more containers can be located, an evacuation means by which the chamber and the or each container can be subjected to sub-atmospheric pressure, coupling means to couple the or each container to a gas supply, weighing means to weigh each container, and control means to control the quantity of gas to the container in response to a weight reading device from said weighing means.
  • the weighing means weighs each container before it is located in the chamber.
  • release means whereby relative movement between a container and the coupling means to which it is coupled can occur such as to assist in the release of the container from the coupling means.
  • compressed air is released from the coupling means at completion of sealing of the container to assist removal of the container.
  • height adjustment means whereby the height of a container within the chamber can be adjusted.
  • Figure 1 is an elevation view
  • Figure 2 is a plan view
  • Figure 3 is a somewhat schematic view but showing the chamber in cross-section
  • Figure 4 is a schematic transverse cross-section through the chamber of the machine.
  • Figure 5 is schematic layout of the gas flush plumbing.
  • the machine 10 includes a main frame 11 to which is moveably mounted a cover 12.
  • the cover 12 is, in the preferred form of the invention, moveable under the control of a number of linear actuators R generally one being located at or adjacent each corner of the cover 12.
  • the bodies of the linear actuators can be fixedly mounted with the frame 11 and the ends of the piston rods P attached to the cover 12. The cover can thus be raised and lowered relative to the frame 11. In Figures 1 and 3 the cover is in the lowered position.
  • the cover 12 defines a chamber 13. Extending above the floor 15 of the chamber 13 is, in the preferred form of the invention, one or as shown in Figure 2 a pair of conveyors 14 which extend longitudinally within the chamber 13. For ease of reference the conveyors 14 will be simply referred to as a chamber conveyor 14.
  • An in-feed conveyor 16 extends toward the cover 12 with its output end located closely adjacent (outside the cover) to the chamber conveyor 14 located within the chamber.
  • an output conveyor 17 extends away from the cover 12 with its input end closely adjacent the output end of the chamber conveyor 14.
  • each of the nozzles is connected by a conduit 19 to a vacuum source VS (see Figure 3) .
  • the nozzle 18 is connected by conduit 19 to the vacuum source VS via a valve 20 (also see Figure 3) .
  • the nozzle 18 is not connected to the vacuum source VS.
  • the mouth of a flexible container engaged with the nozzle is not fully sealed about the nozzle.
  • the container is open to sub-atmospheric pressure in the chamber whereby the flexible container is evacuated by the sub-atmospheric pressure in the chamber.
  • the nozzle 18 can be formed by a tubular member 18a which opens into an elongate chamber 18c which has a projecting mouth 18b having one elongate aperture or preferably a series of apertures. This preferred construction is such that the chamber mouth 18b can be likened in appearance to a mouth organ.
  • the vacuum source VS is also coupled via a valve 21 and conduits 22 to vacuum ports 23 opening through the floor 15.
  • a clamping arrangement (not shown) is provided within the chamber 13 for clamping the neck of the flexible container around the end of the nozzle 18.
  • the clamping arrangement is operable (according to the form of the invention shown in Figure 3) to clamp, in a sealed manner, the neck of the flexible container about the nozzle once the cover 12 is lowered into the closed position.
  • the clamp arrangement is operable to release prior to the flexible containers being moved onto the output conveyor 17 by the chamber conveyor 14.
  • clamping arrangements are well known within the art and do not form part of the present invention, further description herein is not required in order to provide a disclosure of the invention.
  • the flexible container B is not tightly sealed around the nozzle 18 during the evacuation stage.
  • the nozzle 18 is arranged so that it can rise (relative to floor 15) and clamp the upper part of the mouth of the container against a top clamp C mounted to the roof of the cover 12.
  • a top clamp C mounted to the roof of the cover 12.
  • sealing arrangement associated with the or each nozzle 18 and hence the flexible container is associated with the nozzle.
  • sealing arrangements are also well known within the art and are processed controlled so that the flexible container is sealed outward of the end of the nozzle 18 prior to the release of the clamping arrangement.
  • a seal anvil S 1 which is attached to the cover 12.
  • An associated heat seal bar S is mounted and supported from the floor 15.
  • This seal bar S is coupled to a linear actuator arrangement L3 which is in large part located outside the chamber. The linear actuator can thus be actuated to cause the seal bar S to rise and clamp the neck of the flexible container between the seal bar S and seal anvil S 1 so that sealing can take place.
  • the neck can be removed from the nozzle 18.
  • This can be achieved by the conveyor 14 operating so as to move the bag relative to the nozzle.
  • this does not always result in separation of the bag from the nozzle thus it is preferred to have an arrangement whereby the neck is positively pulled off the nozzle, there is a positive relative movement between the nozzle and container resulting in the neck parting from the nozzle .
  • the operating mechanism L3 for the seal bar S will cause the seal bar to rise simultaneously with the cover 12. This has the effect of keeping the neck N of the flexible container B clamped between the seal bar S and the seal anvil S 1 . In this way the neck N of the flexible container B is pulled off the nozzle 18.
  • the nozzle 18 can be moved horizontally by rotating the tubular member 18a through sufficient angle. This removes what effectively is the trailing edge of the nozzle 18 from the bag B so that as the bag moves sideways i.e. in the direction of travel of chamber conveyor 14 relative to the nozzle it does not catch on the end of the nozzle. It is the catching of the bag, or more particularly the neck of the bag on the nozzle, which can often result in the bag failing to separate from the nozzle.
  • the nozzle is arranged such that it is moveable in an upward direction relative to the floor 15.
  • tubular member 18a extending through an opening in the floor 15.
  • the end of the tubular member 18a located outside the chamber is coupled to a linear actuator LI.
  • the piston rod R of the linear actuator LI is coupled to the lower end of the tubular member 18a which the body R 1 is held in a fixed position.
  • a sealing 0 ring or like seal is located between the tubular member 18a and the periphery of the opening in the floor 15 to provide a seal so that the chamber is sealed when the cover is in the closed position.
  • the seal bar S and anvil S 1 can clamp the neck N of the flexible container B during the sealing operation whereupon the nozzle 18 can then be caused to rise relative to the floor by linear actuator LI.
  • This movement causes the nozzle 18 to move upwardly relative to the clamped neck N of the flexible container to create a positive pulling of the nozzle 18 from the neck N of the container B.
  • the container is thus free of the nozzle 18 prior to the seal bar S and anvil S 1 releasing.
  • separation of the nozzle and container occurs before the container is moved by the chamber conveyor 14 from the chamber.
  • This rising arrangement for the nozzle 18 could also be achieved by having a passageway through the centre of a linear actuator or at least through the centre of the piston rod.
  • a conduit 19 will be connected to the internal wall or passageway of the linear actuator so as to connect the end of the nozzle with the vacuum source VS.
  • Conveyor height adjustment can be achieved by having a vertical moving plate inside the chamber. To achieve this each end of the conveyor will extend (about 270mm) outside the chamber 13 either side. This external extension is to provide for detensioning and roller mechanism so as to enable the belt to be lifted.
  • the height adjustment can be incremental or continuous in its adjustment. When incremental it is envisaged that say two or three different positions will be used with adjustment by a two or three position switch to be operated by an operator so as to place the chamber conveyor 14 at the height required.
  • An advantage of having a chamber conveyor 14 principally located within the chamber 13 is that sealing problems associated with existing machines, where a single conveyor passes through the machine, can be overcome. Consequently, with a fully contained conveyor there will be no conveyor belt trapped within the lid seal.
  • the bag B is conveyed via input conveyor 16 onto the chamber conveyor 14. It is conveyed to the nozzle 18 by chamber conveyor 14. An operator then places the mouth of the neck N of the bag B over the nozzle 18. The neck is clamped onto the nozzle by a clamping mechanism which includes a top clamp anvil attached to the inside of the cover 12. This anvil will thus descend with the cover 12 to meet with a lower clamping anvil mounted on the floor 15.
  • a pressure sensor 24 can be coupled to the chamber 13 or more particularly at some point in conduit 22 to sense the pressure within the chamber 13.
  • This pressure sensor 24 can be operably coupled to a display/warning device 25. Accordingly the operator can be alerted either visually and/or aurally to the fact that the chamber 13 has not evacuated to the required level.
  • the warning device will generally form part of a control console C.
  • a pressure transducer 26 is coupled to the nozzle conduit 19 and thereby determines the vacuum level within the conduit 18 and hence the bag B. This transducer 26 is operatively coupled via line 26a with valve 20.
  • vent valve 27 Connected to the floor 15 and opening into the chamber 13 is a vent valve 27.
  • the vent valve 27 is operated by solenoid 28.
  • the vent valve 27 is, for convenience of drawing, shown connected to the cover 12.
  • the solenoid 28 is caused to operate while bag B is still being evacuated.
  • the venting of the chamber 13 will thus result in a consequential rapid collapsing of the bag B.
  • This collapsing of the bag will force out any remaining air and, more particularly, will force out any water vapour or moisture which may be present in the bag.
  • some water vapour or moisture will be present in the bag as a consequence of the chamber pressure having fallen below boiling pressure of water at ambient temperature.
  • the first valve 20 remains open while this occurs any residual air/vapour from the nozzle (and the conduit 19) will be cleared prior to the valve 20 closing.
  • the bag B is not separately connected to the vacuum source VS. This does away with the need to connect conduit 19 of the nozzle 18 via valve 20 to the vacuum source VS.
  • the arrangement is such that the mouth of the bag is only partially clamped to the nozzle 18.
  • a clamp bar e.g. clamp bar C attached to the roof of cover 12 to move toward to the nozzle 18 as the cover 12 descents.
  • the clamp bar C locates a distance from the nozzle 18.
  • the nozzle 18 is then raised by actuator L2 so that the clamp bar C comes into engagement with and clamps with nozzle 18 that part of the mouth of the bag B engaged on the nozzle 18. This results in the remainder of the mouth being undamped.
  • a gas supply GS (e.g. carbon dioxide or a mixture of carbon dioxide and other gases) is coupled via a gas isolation valve Vi to a gas reservoir 31.
  • a pressure regulator 29 is coupled to the gas reservoir 31 which via a controllable valve 30 in conduit 19 controls the flow of gas to nozzle 18 (see Figure 5) .
  • the pressure regulator 29 is incorporated so as to ensure that a constant gas pressure is achieved.
  • Valve 30 is coupled to control unit PLC via line 30a.
  • controllable valve 30 is opened so that gas flushing via the conduit 19 and nozzle 18 occurs.
  • operation of the vent valve 27 can be controlled so that it is responsive (via line 27a) to a pressure reading from the pressure transducer 26.
  • the vent valve 27 can be controlled so that it firstly vents the chamber 13 and then after it has closed the second valve 21 is reopened so that a level of vacuum is pulled in the chamber 13. This will cause the bag B to slightly distend prior to, or at the time of gas flushing. The chamber 13 can then be re-vented before the chamber is opened.
  • weighing means W are associated with, or form part of, the input conveyor 16.
  • one or more local cells are located below and in contact with the belt of the input conveyor.
  • incoming packages are each individually weighed on the weighing means W and indexed onto the chamber conveyor 14 so that the weight of product in each bag is known.
  • the weighing means is coupled to the control unit PLC. Using process logic techniques the weight of product in each bag is used to calculate the volume of gas required for each bag.
  • the process logic control PLC will adjust the time that controllable valve 30 remains open and as a consequence of the constant pressure of the gas being supplied from the gas supply GS the correct volume of gas required for the bag B can be controlled.
  • the present invention provides a method and means whereby the volume of gas to be supplied by the flexible container in the gas flushing operation is tailored to suit the weight of product within the bag, thereby not only ensuring that the required volume of gas is supplied to the bag but also better economics are achieved by obviating or at least lessening gas wastage.
  • the flexible container is necessarily distended with gas. If the gas is C0 2 and the product is meat then the C0 2 is absorbed into the meat over a period of one or two days. During this time it is usual practice to hold the package in a chiller to lower the meat temperature to slow bacteria growth and also to speed gas absorption.
  • the invention minimises the time delay before the outer rigid container can be fully closed and sealed. This minimisation of the time delay flows into a reduction in the cost involved before the product can be shipped.
  • the present invention also provides two means for ensuring that there is positive removal of the neck of a container from the nozzle to which it is connected. Firstly the nozzle rises at the completion of the sealing process as described previously. Secondly compressed air can be released through the nozzle to blow the container clear.
  • a conduit 32 connects nozzle 18 to a breathable air connection 33.
  • V 2 which is operable by the PLC to permit the blast of air to the nozzle to take place.
  • a "sniffer" is also provided in order to sense the level of oxygen which may remain in the bag B following evacuation. This, in accordance with known techniques, enables the PLC to ensure that correct evacuation has taken place.
  • an oxygen analyser sensor module 34 is connected to a vacuum connection 35.
  • the module 34 is connected via conduit 36 to an analyser sample head 37.
  • the sample head 27 is coupled via line 38 to a sample port 39 in the nozzle 18.
  • a controllable valve V 3 in line 38 is operable by the PLC to enable operation of the oxygen sensor module.
  • the present invention provides for product height adjustment within the chamber so as to accommodate different packs/containers .
  • the packaging machine is open to modification.
  • the machine throughput can be increased by using gusseted bags which lie transverse on the chamber conveyor 1 relative to the direction of travel (as opposed to the longitudinal orientation of the containers as described herein) .
  • more bags B can be handled during an operation cycle.
  • the machine will be modified to incorporate further nozzles 18. This is achievable because the length of the elongate mouth organ part of the nozzle can be reduced as a consequence of the use of gusseted bags.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vacuum Packaging (AREA)

Abstract

La présente invention concerne une machine de conditionnement à évacuation de gaz destinée à conditionner un produit dans des contenants souples. Cette machine comprend une chambre (13) dans laquelle on peut placer au moins un contenant (B). Une source d'aspiration (VS) permet d'évacuer le gaz de cette chambre et des contenants (B). Le contenant (B) est couplé à une buse (18) à travers laquelle du gaz en provenance d'une alimentation en gaz (GS) peut s'écouler dans ce contenant (B). Une unité de commande de processus (PLC) commande la quantité de gaz à fournir au contenant via une vanne (30) commandable en réponse au poids de ce contenant tel que lu par un dispositif de pesage (W).
PCT/NZ2002/000178 2001-09-14 2002-09-13 Machine de conditionnement a evacuation de gaz WO2003024804A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ51421401 2001-09-14
NZ514214 2001-09-14

Publications (1)

Publication Number Publication Date
WO2003024804A1 true WO2003024804A1 (fr) 2003-03-27

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Family Applications (1)

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PCT/NZ2002/000178 WO2003024804A1 (fr) 2001-09-14 2002-09-13 Machine de conditionnement a evacuation de gaz

Country Status (1)

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WO (1) WO2003024804A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8099930B2 (en) * 2008-02-25 2012-01-24 Multivac Sepp Haggenmueller Gmbh & Co. Kg Device and method for positioning of nozzles
DE102008019108B4 (de) * 2008-04-16 2015-11-26 Multivac Sepp Haggenmüller Gmbh & Co. Kg Verpackungsmaschine
WO2016044126A1 (fr) * 2014-09-16 2016-03-24 The United States Of America As Represented By The Secretary Of The Army Source de dioxyde de carbone pour la surveillance d'un vecteur de type arthropode
IT202100008252A1 (it) * 2021-04-01 2022-10-01 Bmb S R L Confezionatrice sottovuoto perfezionata del tipo a nastro

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568544A1 (fr) * 1984-07-31 1986-02-07 Dito Sama Machine permettant l'emballage sous vide de produits agro-alimentaires
FR2623471A1 (fr) * 1987-11-20 1989-05-26 Bernhardt Sa Procede de placement sous atmosphere controlee de l'interieur de poches souples et aux moyens pour la mise en oeuvre de ce procede
WO1990003920A1 (fr) * 1988-10-14 1990-04-19 Piper, James, William Procede et appareil d'emballage d'aliments
US4926614A (en) * 1986-11-05 1990-05-22 Rmf Steel Products Co. Packaging method and apparatus
WO1998021099A1 (fr) * 1996-11-08 1998-05-22 Robert Bosch Gmbh Dispositif de conditionnement sous vide et sous gaz de paquets remplis
WO2000027706A2 (fr) * 1998-10-28 2000-05-18 Cryovac, Inc. Machine a emballer sous vide
US20020043050A1 (en) * 2000-10-17 2002-04-18 Costello Anthony William Controlled gas packaging

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568544A1 (fr) * 1984-07-31 1986-02-07 Dito Sama Machine permettant l'emballage sous vide de produits agro-alimentaires
US4926614A (en) * 1986-11-05 1990-05-22 Rmf Steel Products Co. Packaging method and apparatus
FR2623471A1 (fr) * 1987-11-20 1989-05-26 Bernhardt Sa Procede de placement sous atmosphere controlee de l'interieur de poches souples et aux moyens pour la mise en oeuvre de ce procede
WO1990003920A1 (fr) * 1988-10-14 1990-04-19 Piper, James, William Procede et appareil d'emballage d'aliments
WO1998021099A1 (fr) * 1996-11-08 1998-05-22 Robert Bosch Gmbh Dispositif de conditionnement sous vide et sous gaz de paquets remplis
WO2000027706A2 (fr) * 1998-10-28 2000-05-18 Cryovac, Inc. Machine a emballer sous vide
US20020043050A1 (en) * 2000-10-17 2002-04-18 Costello Anthony William Controlled gas packaging

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8099930B2 (en) * 2008-02-25 2012-01-24 Multivac Sepp Haggenmueller Gmbh & Co. Kg Device and method for positioning of nozzles
DE102008019108B4 (de) * 2008-04-16 2015-11-26 Multivac Sepp Haggenmüller Gmbh & Co. Kg Verpackungsmaschine
WO2016044126A1 (fr) * 2014-09-16 2016-03-24 The United States Of America As Represented By The Secretary Of The Army Source de dioxyde de carbone pour la surveillance d'un vecteur de type arthropode
IT202100008252A1 (it) * 2021-04-01 2022-10-01 Bmb S R L Confezionatrice sottovuoto perfezionata del tipo a nastro
WO2022208311A1 (fr) * 2021-04-01 2022-10-06 Bmb S.R.L. Machine d'emballage sous vide de type à courroie

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