WO2004078609A1 - Poche avec piege a liquides et procede de fabrication - Google Patents

Poche avec piege a liquides et procede de fabrication Download PDF

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Publication number
WO2004078609A1
WO2004078609A1 PCT/US2004/006769 US2004006769W WO2004078609A1 WO 2004078609 A1 WO2004078609 A1 WO 2004078609A1 US 2004006769 W US2004006769 W US 2004006769W WO 2004078609 A1 WO2004078609 A1 WO 2004078609A1
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WO
WIPO (PCT)
Prior art keywords
panel
bag
gas
inner layer
forming
Prior art date
Application number
PCT/US2004/006769
Other languages
English (en)
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 US10/794,349 external-priority patent/US20050034806A1/en
Priority claimed from US10/795,149 external-priority patent/US20050037164A1/en
Application filed by Tilia International, Inc. filed Critical Tilia International, Inc.
Priority to AU2004217917A priority Critical patent/AU2004217917A1/en
Priority to MXPA05009456A priority patent/MXPA05009456A/es
Priority to CA002517808A priority patent/CA2517808A1/fr
Priority to EP04718048A priority patent/EP1615834A1/fr
Publication of WO2004078609A1 publication Critical patent/WO2004078609A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/04—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
    • 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
    • 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
    • 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
    • B65D33/16—End- or aperture-closing arrangements or devices
    • 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
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • 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
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2398/00—Unspecified macromolecular compounds
    • B32B2398/20—Thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • 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
    • B65D81/2023—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 in a flexible container

Definitions

  • 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.
  • 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.
  • the perishable or other products are packed into the envelope through the inlet, and the inlet is sealed. Thereafter, an opening is pierced in a part of the panel material that communicates with the channels, air is removed from the interior of the envelope through the channels and opening, and the opening is sealed.
  • This type of bag requires two additional sealing steps after the perishable or other product is packed into the envelope.
  • embossing creates impressions on the plastic such that indentations are formed on the opposite side of the panel.
  • a vacuum bag 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.
  • Such a bag is described in U.S. Pat. No. Re.34,929, incorporated herein by reference.
  • 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. 1 A 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. 2A is a top view of a partial portion of a first panel overlapping a partial portion of a second panel in accordance with one embodiment of the present invention
  • FIG. 2B is a cross-section view through line 2B-2B of FIG. 2A;
  • FIG. 3A-3E are plan views of exemplary patterns on a panel in accordance with embodiments of the present invention, manufactured by the process shown in FIG. 1 ; and [0037] 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 liquid flow obstructing protuberances and/or channels.
  • a laminating roll 102 and a cooling roll 104 are arranged so that melt-extruded resin can be introduced between the rolls and cooled to form the heat- sealable inner layer 106 and to laminate the formed inner layer 106 to the gas-impermeable base layer 108.
  • a 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 can be sufficiently cooled to form a desired pattern.
  • 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 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 are brought into contact and heat is 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 can be comprised of polyester, polyamide, ethylene vinyl alcohol (EVOH), nylon, or other material having similar properties, that is capable of being heated and capable of being used in this manufacturing process.
  • 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 a 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
  • the amount of resin 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 (and/or protuberances) defining a plurality of discrete channels having a baffled structure.
  • the resin extruded from 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.
  • the resin quickly cools and solidifies in the desired pattern 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.
  • the thickness of each protuberance formed on the heat-sealable inner layer 106 of a panel can be determined by the depth of the cavities of the cooling roll 104, and the width of the channel can be determined by the interval between the cavities.
  • the shape, width, and thickness of the channels for the evacuation of air and/or other gases can be controlled by changing the specifications for the cavities of the cooling roll 104.
  • FIGS.2A and 2B illustrate a cross-section (along line 2B-2B) of two panels in accordance with one embodiment of the present invention (the thickness of the panels are exaggerated relative to the width of the channel walls and baffles).
  • the heat-sealable inner layer 106 can range from preferably 0.5-6.0 mils in thickness at the channels 224, and preferably 1.0-12.0 mils in thickness at the protuberances 226,228, while the gas-impermeable base layer 108 can range from about preferably 0.5-8.0 mils in thickness.
  • the dimensions of the inner layer and the base layer are set forth to illustrate, but are not to be construed to limit the dimensions of the inner layer and the base layer.
  • FIG. 3A is a plan view of a pattern 320 formed on a panel by the cooling roll
  • baffles 228 can be arranged in a herringbone pattern at angles such that air and/or other gases 340 (shown schematically) can be drawn around the baffles 228 by suction and evacuated from the vacuum bag, while heavier liquid particles 342 can be trapped between the channel walls 226 and the baffles 228. Angles formed by the intersection of baffles 228 and channel walls 226, and gaps between adjacent baffles 228 can be defined when producing the cooling roll 104 to suit the liquid intended to be trapped.
  • baffles 228 can be multi-fold (shaped to define liquid-trapping vessels), and can be optimized to improve evacuation of the air and/or other gases 340, while effectively preventing liquids 342 from being drawn out of the vacuum bag.
  • the baffles 228 can be arranged such that an approach angle for passing through the channel opening between the baffles 228 is severe and that vessels formed by the baffles 228 are relatively deep, thereby retarding liquid flow by deflecting liquid 342 into the vessels and trapping a significant amount of liquid 342.
  • baffle arrangements for retarding the evacuation of liquid 342 relative to the evacuation of air and/or other gases 340.
  • a pattern 320 fabricated on the circumferential surface of the cooling roll 104, and thereafter the panel can mold protuberances forming a plurality of channels 224 defined by "V"-shaped baffles 228, eliminating the need for molding channel walls.
  • the channel walls 226 can extend substantially the length of the panel with only a portion of the length of the channels near an evacuation opening having baffles 228.
  • a pattern 320 fabricated on the circumferential surface of the cooling roll 104, and thereafter the panel can mold protuberances forming a plurality of channels 224 having channels walls 226 and baffles 228, wherein each baffle 228 extends across a substantial portion of the width of the channel 224, thereby defining a path between the baffle 228 and the channel wall 226 for the air and/or other gases 340 to be drawn.
  • the baffles 228 can alternatively be parabolic or rounded, as shown in FIG. 3D, to form pockets for collecting liquid particles 342.
  • FIG.3E illustrates still another embodiment of a pattern 320 fabricated on the circumferential surface of the cooling roll 104, and thereafter the panel, that can include parabolically-shaped or "U"-shaped baffles 228 arranged like fish-scales either along the length of the panel, or a portion of the panel to capture liquid particles 342.
  • the U-shaped baffles 228 can also include slits 330 in the troughs of the U-shaped baffles 228 small enough to improve the flow of air and/or other gases 340 while retarding an amount of liquid particles 342.
  • the baffles 228 can be more or less parabolic.
  • One of ordinary skill in the art can appreciate the multitude of different baffle shapes for retarding the evacuation of liquid relative to the evacuation of air or other gases.
  • 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 452 and a second panel 454 overlapping each other. Channels 224 are formed on at least one of the panels 452,454 in accordance with an embodiment described above .
  • the heat-sealable inner layer 106 and the gas-impermeable base layer 108 of the first and second panels 452,454 are typically made of the same material respectively, but can alternatively be made of different materials that exhibit heat-sealability and gas-impermeability respectively. As described above, the resin-formed 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 452,454 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 the above referenced 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 where contacted by the heat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)

Abstract

Une poche utilisée pour les emballages sous vides comprend un premier et un second panneaux se recouvrant. Sur l'un des panneaux ou plus est formée une pluralité de canaux comportant une pluralité de chicanes servant à l'évacuation par aspiration de l'air ou d'autres gaz de l'intérieur de la poche, tout en empêchant des liquides d'être aspirés à l'intérieur. 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 cavités 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.
PCT/US2004/006769 2003-03-05 2004-03-05 Poche avec piege a liquides et procede de fabrication WO2004078609A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2004217917A AU2004217917A1 (en) 2003-03-05 2004-03-05 Liquid-trapping bag and method of making it
MXPA05009456A MXPA05009456A (es) 2003-03-05 2004-03-05 Bolsa que atrapa liquidos y metodo para fabricarla.
CA002517808A CA2517808A1 (fr) 2003-03-05 2004-03-05 Poche avec piege a liquides et procede de fabrication
EP04718048A EP1615834A1 (fr) 2003-03-05 2004-03-05 Poche avec piege a liquides et procede de fabrication

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US45213803P 2003-03-05 2003-03-05
US45216803P 2003-03-05 2003-03-05
US60/452,168 2003-03-05
US60/452,138 2003-03-05
US10/794,349 US20050034806A1 (en) 2003-03-05 2004-03-04 Method for manufacturing liquid-trapping bag for use in vacuum packaging
US10/794,349 2004-03-04
US10/795,149 US20050037164A1 (en) 2003-03-05 2004-03-04 Liquid-trapping bag for use in vacuum packaging
US10/795,149 2004-03-04

Publications (1)

Publication Number Publication Date
WO2004078609A1 true WO2004078609A1 (fr) 2004-09-16

Family

ID=32966715

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/006769 WO2004078609A1 (fr) 2003-03-05 2004-03-05 Poche avec piege a liquides et procede de fabrication

Country Status (6)

Country Link
EP (1) EP1615834A1 (fr)
KR (1) KR20050115890A (fr)
AU (1) AU2004217917A1 (fr)
CA (1) CA2517808A1 (fr)
MX (1) MXPA05009456A (fr)
WO (1) WO2004078609A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005040005A1 (fr) * 2003-10-09 2005-05-06 Laica S.P.A. Emballage de type sac pour emballer sous vide des produits en general

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2778173A (en) * 1950-11-29 1957-01-22 Wilts United Dairies Ltd Method of producing airtight packages
US5554423A (en) * 1993-10-13 1996-09-10 Abate; Luigi F. Tubular element for the formation of bags for the vacuum-packing
JPH1034760A (ja) * 1996-07-25 1998-02-10 Kuraray Co Ltd 複合シート材の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2778173A (en) * 1950-11-29 1957-01-22 Wilts United Dairies Ltd Method of producing airtight packages
US5554423A (en) * 1993-10-13 1996-09-10 Abate; Luigi F. Tubular element for the formation of bags for the vacuum-packing
JPH1034760A (ja) * 1996-07-25 1998-02-10 Kuraray Co Ltd 複合シート材の製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005040005A1 (fr) * 2003-10-09 2005-05-06 Laica S.P.A. Emballage de type sac pour emballer sous vide des produits en general

Also Published As

Publication number Publication date
AU2004217917A1 (en) 2004-09-16
MXPA05009456A (es) 2005-11-23
EP1615834A1 (fr) 2006-01-18
KR20050115890A (ko) 2005-12-08
CA2517808A1 (fr) 2004-09-16

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