WO2004078590A2 - Systeme et procede de realisation d'un ensemble horloge/detecteur integre pour emballage sous vide - Google Patents

Systeme et procede de realisation d'un ensemble horloge/detecteur integre pour emballage sous vide Download PDF

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Publication number
WO2004078590A2
WO2004078590A2 PCT/US2004/006768 US2004006768W WO2004078590A2 WO 2004078590 A2 WO2004078590 A2 WO 2004078590A2 US 2004006768 W US2004006768 W US 2004006768W WO 2004078590 A2 WO2004078590 A2 WO 2004078590A2
Authority
WO
WIPO (PCT)
Prior art keywords
panel
bag
inner layer
gas
sensor
Prior art date
Application number
PCT/US2004/006768
Other languages
English (en)
Other versions
WO2004078590A3 (fr
Inventor
Hongyu Wu
Charles Wade Albritton
David Brakes
Original Assignee
Tilia International Inc.
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
Priority claimed from US10/794,368 external-priority patent/US20050037163A1/en
Priority claimed from US10/794,373 external-priority patent/US20050043158A1/en
Application filed by Tilia International Inc. filed Critical Tilia International Inc.
Publication of WO2004078590A2 publication Critical patent/WO2004078590A2/fr
Publication of WO2004078590A3 publication Critical patent/WO2004078590A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
    • B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
    • B65D81/2038—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum with means for establishing or improving vacuum
    • 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
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/02—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for perforating, scoring, slitting, or applying code or date marks on material prior to packaging
    • B65B61/025—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for perforating, scoring, slitting, or applying code or date marks on material prior to packaging for applying, e.g. printing, code or date marks on material prior to packaging
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/04—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material
    • B65B9/042—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material for fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/004—Information or decoration elements, e.g. level indicators, detachable tabs or coupons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/04—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material
    • B65B2009/047—Rotary pocket formers

Definitions

  • VACUUM PACKAGING by Henry Wu, etal., filed March 5, 2003 (Attorney Docket No. TILA- 01180US1 );
  • the present invention relates to bags for use in vacuum packaging and methods and devices for manufacturing bags for use in vacuum packaging.
  • BACKGROUND Methods and devices for preserving perishable foods such as fish and meats, processed foods, prepared meals, and left-overs, and non-perishable items are widely known, and widely varied. Foods are perishable because organisms such as bacteria, fungus and mold grow over time after a food container is opened and the food is left exposed to the atmosphere. Most methods and devices preserve food by protecting food from organism-filled air.
  • a common method and device includes placing food into a gas-impermeable plastic bag, evacuating the air from the bag using suction from a vacuum pump or other suction source, and tightly sealing the bag.
  • a bag for use in vacuum packaging can consist of a first panel and second panel, each panel consisting of a single layer of heat-sealable, plastic-based film (for example, polyethylene).
  • the panels are sealed together along a substantial portion of the periphery of the panels by heat-sealing techniques so as to form an envelope.
  • Perishable products such as spoilable food, or other products are packed into the envelope via the unsealed portion through which air is subsequently evacuated. After perishable products are packed into the bag and air is evacuated from the inside of the bag, the unsealed portion is heated and pressed such that the panels adhere to each other, sealing the bag.
  • 2,778,173, incorporated herein by reference, discloses a method for improving the evacuation of air from the bag by forming channels in at least one of the panels with the aid of embossing techniques. Air escapes from the bag along the channels during evacuation.
  • the embossing forms a pattern of protuberances on at least one of the panels.
  • the protuberances can be discrete pyramids, hemispheres, etc., and are formed by pressing a panel using heated female and male dies.
  • the first panel is overlaid on the second panel such that the protuberances from one panel face the opposite panel.
  • the contacting peripheral edges of the panels are sealed to each other to form an envelope having an inlet at an unsealed portion of the periphery.
  • a vacuum bag is formed having a first panel and a second panel consisting of laminated films. Each panel comprises a heat- sealable inner layer, a gas-impermeable outer layer, and optionally, one or more intermediate layers.
  • At least one film from at least one panel is embossed using an embossing mold to form protuberances and channels defined by the space between protuberances, so that air is readily evacuated from the vacuum bag.
  • the bag consists of a first and second panel, each panel consisting of a gas-impermeable outer layer and a heat-sealable inner layer.
  • a plurality of heat-sealable strand elements are heat bonded at regular intervals to the inner layer of either the first panel or the second panel.
  • the spaces between strand elements act as channels for the evacuation of air.
  • the strand elements are extruded from an extrusion head and heat bonded to the heat-sealable layer by use of pressure rolls. Separate equipment is required for producing strand elements, and a procedure of heat bonding a plurality of strand elements at regular intervals to the heat-sealable inner layer is complicated. Also, various shapes of pattern are hard to form using this process.
  • FIG. 1A is a perspective view of a method for manufacturing a vacuum bag in accordance with one embodiment of the present invention
  • FIG. 1B is a side view of the method shown in FIG. 1A illustrating the embossing method used in an embodiment of the present invention
  • FIG. 1C is a close-up view of a portion of FIG. 1B;
  • FIG.2 is a plan view of an exemplary timer/sensor on a panel in accordance with embodiments of the present invention, manufactured by the process shown in FIGs. 1A- 1C;
  • FIG. 3 is a cross-section of a portion of a panel as illustrated in FIG. 2, according to an embodiment of the present invention.
  • FIG. 4 is a perspective view of a vacuum bag in accordance with one embodiment of the present invention.
  • FIGs. 1A-1C illustrate one embodiment of a method for manufacturing a vacuum bag in accordance with the present invention.
  • the vacuum bag comprises a first panel and a second panel, wherein each panel comprises a gas-impermeable base layer 108 and a heat-sealable inner layer 106 with at least one panel having a timer and/or sensor embedded inside the vacuum bag.
  • a laminating roll 102 and a cooling roll 104 are arranged so that the heat-sealable inner layer 106 can be laminated to the gas-impermeable base layer 108 as the melt-extruded resin is cooled. As illustrated in FIG.
  • the gap between the laminating roll 102 and the cooling roll 104 can be controlled according to specifications (for example, thickness) of a panel for use in vacuum packaging.
  • the temperature of the cooling roll 104 is maintained in a range such that the melt-extruded resin is sufficiently cooled to form the desired pattern. For example, a temperature range of about -15°C to about -10 °C can be sufficient to properly form the desired pattern.
  • the temperature range of the cooling roll 104 can vary according to the composition of the resin, the composition of the gas- impermeable base layer 108, environmental conditions, etc. and can require calibration.
  • the cooling roll 104 can be sized to have a larger diameter than the laminating roll 102, thereby bringing the melt-extruded resin into contact with more cooled surface area.
  • the diameter of the cooling roll 104 can be about one-and-a-half to about three times as large (or more) as that of the laminating roll 102.
  • the heat-sealable inner layer 106 typically comprises a thermoplastic resin.
  • the melt-extruded resin can be comprised of polyethylene (PE) suitable for preserving foods and harmless to a human body.
  • PE polyethylene
  • a vacuum bag can be manufactured by overlapping two panels such that the heat-sealable inner layers 106 of the two panels can be brought into contact and heat can be applied to a portion of the periphery of the panels to form an envelope.
  • the thermoplastic resin can be chosen so that the two panels strongly bond to each other when sufficient heat is applied.
  • the gas-impermeable base layer 108 is fed to the gap between the cooling roll 104 and the laminating roll 102 by a feeding means (not shown).
  • the gas-impermeable base layer can be comprised of polyester, polyamide, ethylene vinyl alcohol (EVOH), nylon, or other material having similar properties and capable of being used in this manufacturing process, and also capable of being heated.
  • the gas-impermeable base layer 108 can consist of one layer, or two or more layers. When employing a multilayer-structured base layer, it should be understood that a total thickness thereof is also adjusted within the allowable range for the total gas-impermeable base layer 108.
  • An extruder 110 is positioned in such a way that the melt-extruded resin is layered on the gas-impermeable base layer 108 by feeding the melt-extruded resin to the nip between the cooling roll 104 and the gas-impermeable base layer 108.
  • the resin is fed through a nozzle 112 of the extruder 110.
  • the temperature of the melt-extruded resin is dependent on the type of resin used, and can typically range from about 200°C to about 250°C.
  • the amount of resin to be extruded into the laminating unit 100 is dependent on the desired thickness of the heat-sealable inner layer 106.
  • a pattern fabricated on the circumferential surface of the cooling roll 104 in accordance with one embodiment of the present invention can include cavities for suspending timers and/or sensors for encapsulation by melt-extruded resin.
  • Timers and/or sensors 124 can be seeded in cavities of the cooling roll 104, forexample by a label machine 114 attached to the extruder 110.
  • the resin melt-extruded by the nozzle 112 is pressed between the cooling roll 104 and the gas-impermeable base layer 108 and flows into the cavities of the cooling roll 104 and surrounds the timers and/or sensors.
  • the timer and/or sensor can be any device capable of communicating information to a user.
  • active radio frequency identification tags such as the PowerlD Smart Active Labels (SAL) system manufactured by Power Paper Ltd. of Israel, contain batteries and can be used as disposable timers. Sensors such as the PowerlD SALs can be user activated, are thin and flexible, and low-cost, while at the same time are non-toxic in case of package penetration.
  • the timer and/or sensor can be connected with the gas-impermeable base layer 108, for example by adhesives, before the gas-impermeable base layer 108 is fed to the cooling roll 104, thereby eliminating the need for cavities of the cooling roll 104.
  • the sensor can be a temperature sensor having chemistry that can change color if exposed to specific temperatures for prolonged periods of time.
  • the resin quickly cools and solidifies with the timer and/or sensor impregnated or embedded in the resin, while adhering to the gas- impermeable base layer 108, thereby forming the heat-sealable inner layer 106 of the panel.
  • the heat-sealable inner layer 106 can be formed while the resin is sufficiently heated to allow the resin to flow, thereby molding the resin, unlike other methods adopting a post-embossing treatment where the heat-sealable inner layer is drawn by a die or embossed between male and female components.
  • chemicals such as silver chloride or silver halide, for example, can be added to the melt-extruded resin such that molecules of the chemicals are transparent to visible light in the absence of UV light (such as artificial light), thereby allowing the user to view the contents. When exposed to UV rays, as in direct sunlight, the molecules undergo a chemical process that causes them to change shape.
  • the new molecular structure absorbs portions of the visible light, causing the film to darken.
  • the number of molecules that change shape varies with the intensity of the UV rays. In this manner, contents of the vacuum bag can be protected from the harmful effects of UV rays.
  • a laminated film formed by the heat-sealable inner layer 106 and gas-impermeable base layer 108 can be fed to a second cooling roll (not shown) for adding a second inner layer, thereby forming a barrier between the impregnated resin material and the packaged product.
  • chemicals such as potassium permanganate, for example, can be added to the melt-extruded resin such that products that can spoil in the presence of ethylene can be preserved for a longer period as the ethylene is absorbed by the impregnated layer.
  • a laminated film formed by the heat-sealable inner layer 106 and gas- impermeable base layer 108 can be fed to a second cooling roll for adding a second inner layer, thereby forming a barrier between the impregnated resin material and the packaged product that prevents chemicals from leaching into the product, while allowing ethylene gas to be absorbed through the barrier.
  • timers and/or sensors can be added to a vacuum bag.
  • FIG. 2 is a plan view of a panel 220 formed by the cooling roll 104 for use in a vacuum bag, in which the heat-sealable inner layer 106 is molded in such a way that a timer/sensor 124 is embedded in the heat-sealable inner layer 106.
  • the timer/sensor 124 can be activated to measure the amount of time a product has been packed or stored.
  • a second timer/sensor 226 can be embedded in the heat-sealable inner layer 106 such that the temperature of the bag can be monitored.
  • FIG. 1 is a plan view of a panel 220 formed by the cooling roll 104 for use in a vacuum bag, in which the heat-sealable inner layer 106 is molded in such a way that a timer/sensor 124 is embedded in the heat-sealable inner layer 106.
  • the timer/sensor 124 can be activated to measure the amount of time a product has been packed or stored.
  • a second timer/sensor 226
  • the heat-sealable inner layer 106 can range, for example, from about 0.5- .0 mils in thickness between timers and/or sensors, while the gas- impermeable base layer 108 can range, for example, from about 0.5-8.0 mils in thickness.
  • a second heat-sealable inner layer optionally added, can add an additional 0.5-4.0 mils in thickness.
  • the features and structures described above can be combined with other manufacturing techniques to form a valve or other structure, or tray, as described in the cross- referenced provisional applications, incorporated herein by reference.
  • the circumferential surfaces of the cooling rolls 104 described above can optionally include protuberances for forming perforations (not shown), such that a bag can be separated from a roll of bags by a customer.
  • FIG.4 illustrates a bag for use in vacuum packaging in accordance with one embodiment of the present invention.
  • the vacuum bag 450 comprises a first panel 220 and a second panel 422 overlapping each other.
  • a timer and/or sensor is formed on the first panel 220 in accordance with an embodiment described above.
  • the second panel 422 (or first panel 220) optionally includes channels (not shown) along a portion of the panel for evacuating air and other gases from the bag.
  • the channels can be formed, for example, as described in the cross-referenced application "LIQUID-TRAPPING BAG FOR VACUUM PACKAGING," incorporated herein by reference.
  • the heat-sealable inner layer 106 and the gas-impermeable base layer 108 of the first and second panels 220,422 are typically made of the same material respectively, but can alternatively be made of different materials that exhibit heat-sealability and gas-impermeability respectively.
  • the heat- sealable inner layer 106 is used as an inner layer and the gas-impermeable base layer 108 is used as an outer layer.
  • the lower, left, and right edges of the first and the second panel 220,422 are bonded to each other by heating, so as to form an envelope for receiving a perishable or other product to be vacuum packaged.
  • air and/or other gases can be evacuated from the bag 450, for example by a vacuum sealing machine as described in U.S. Pat. No. 4,941 ,310, which is incorporated herein by reference.
  • the inlet can be sealed by applying heat, thereby activating the heat- sealable inner layers 106 and bonding them together.

Abstract

Cette invention concerne un poche sous vide pouvant comprendre un premier panneau et un second panneau, chaque panneau comprenant une couche de base imperméable aux gaz et une couche intérieure thermoscellable, l'un au moins des panneaux étant équipé d'un ensemble horloge/détecteur noyé dans la couche intérieure ou encapsulé par cette dernière. L'horloge et/ou le détecteur peuvent s'utiliser pour contrôler le temps de stockage et/ou l'état de produits emballés, ou bien pour protéger des contenus. Dans un mode de réalisation, l'invention concerne un procédé de fabrication d'un tel sac consistant à introduire un matériau imperméable aux gaz dans l'espace entre un rouleau de refroidissement et un rouleau de laminage. De la résine est extrudée dans l'écartement entre rouleaux se telle sorte qu'elle remplisse une pluralité de cavité dans le rouleau de refroidissement et forme une couche intérieure qui adhère sur le matériau imperméable aux gaz. La feuille ainsi obtenue est repliée pour former un premier et un second panneau, puis scellée pour former une poche. Pour d'autres caractéristiques, aspects et objets de l'invention, se reporter aux spécifications, chiffres et caractéristiques.
PCT/US2004/006768 2003-03-05 2004-03-05 Systeme et procede de realisation d'un ensemble horloge/detecteur integre pour emballage sous vide WO2004078590A2 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US45215703P 2003-03-05 2003-03-05
US45213903P 2003-03-05 2003-03-05
US60/452,139 2003-03-05
US60/452,157 2003-03-05
US10/794,368 US20050037163A1 (en) 2003-03-05 2004-03-04 Sealable bag having an integrated timer/sensor for use in vacuum packaging
US10/794,373 2004-03-04
US10/794,373 US20050043158A1 (en) 2003-03-05 2004-03-04 Method for manufacturing a sealable bag having an integrated timer/sensor for use in vacuum packaging
US10/794,368 2004-03-04

Publications (2)

Publication Number Publication Date
WO2004078590A2 true WO2004078590A2 (fr) 2004-09-16
WO2004078590A3 WO2004078590A3 (fr) 2005-05-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529155A (zh) * 2012-02-14 2012-07-04 蚌埠市振华包装机械有限责任公司 纸板一体化成型的压线切边辊

Citations (6)

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Publication number Priority date Publication date Assignee Title
US2358176A (en) * 1940-05-22 1944-09-12 Goodrich Co B F Method and apparatus for making articles of plastic material
US3054551A (en) * 1959-07-15 1962-09-18 Crown Zellerbach Corp Fluid impervious containers
US3591870A (en) * 1968-11-14 1971-07-13 Gordon A Friesen International Sanitary disposable receiver for liquid and solid wastes
US4838429A (en) * 1986-10-10 1989-06-13 Baxter International Inc. Flexible thermoplastic pouches having easy-open tear strip means and apparatus for making same
US4969470A (en) * 1984-02-27 1990-11-13 Boston Scientific Corporation Heart analysis using pressure-controlled intermittent coronary sinus occlusion
US6277547B1 (en) * 1999-09-30 2001-08-21 Eastman Kodak Company Flexible silver halide packaging material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2358176A (en) * 1940-05-22 1944-09-12 Goodrich Co B F Method and apparatus for making articles of plastic material
US3054551A (en) * 1959-07-15 1962-09-18 Crown Zellerbach Corp Fluid impervious containers
US3591870A (en) * 1968-11-14 1971-07-13 Gordon A Friesen International Sanitary disposable receiver for liquid and solid wastes
US4969470A (en) * 1984-02-27 1990-11-13 Boston Scientific Corporation Heart analysis using pressure-controlled intermittent coronary sinus occlusion
US4838429A (en) * 1986-10-10 1989-06-13 Baxter International Inc. Flexible thermoplastic pouches having easy-open tear strip means and apparatus for making same
US6277547B1 (en) * 1999-09-30 2001-08-21 Eastman Kodak Company Flexible silver halide packaging material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529155A (zh) * 2012-02-14 2012-07-04 蚌埠市振华包装机械有限责任公司 纸板一体化成型的压线切边辊

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