WO2006036275A2 - Film multicouche de formation d'un sac d'emballage a vide et son procede de fabrication - Google Patents
Film multicouche de formation d'un sac d'emballage a vide et son procede de fabrication Download PDFInfo
- Publication number
- WO2006036275A2 WO2006036275A2 PCT/US2005/026037 US2005026037W WO2006036275A2 WO 2006036275 A2 WO2006036275 A2 WO 2006036275A2 US 2005026037 W US2005026037 W US 2005026037W WO 2006036275 A2 WO2006036275 A2 WO 2006036275A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- film
- vacuum packaging
- pattern
- ridges
- Prior art date
Links
- 238000009461 vacuum packaging Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000000463 material Substances 0.000 claims description 48
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 229920013716 polyethylene resin Polymers 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims 2
- 229920006255 plastic film Polymers 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000012785 packaging film Substances 0.000 abstract description 65
- 229920006280 packaging film Polymers 0.000 abstract description 65
- 239000007789 gas Substances 0.000 description 13
- 238000004049 embossing Methods 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/18—Thermoforming apparatus
- B29C51/20—Thermoforming apparatus having movable moulds or mould parts
- B29C51/22—Thermoforming apparatus having movable moulds or mould parts rotatable about an axis
- B29C51/225—Thermoforming apparatus having movable moulds or mould parts rotatable about an axis mounted on a vacuum drum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0014—Extrusion moulding in several steps, i.e. components merging outside the die producing flat articles having components brought in contact outside the extrusion die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/007—Forming single grooves or ribs, e.g. tear lines, weak spots
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- B32—LAYERED PRODUCTS
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- 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
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- 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
- B32B3/263—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 having non-uniform thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/03—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers with respect to the orientation of features
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- 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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
-
- 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
- B65D33/01—Ventilation or drainage of bags
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- 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
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- 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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/007—Using fluid under pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/06—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using vacuum drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
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- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
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- B32B2307/7242—Non-permeable
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- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Definitions
- the present invention relates generally to vacuum packaging film, and more particularly to patterned vacuum packaging film.
- Vacuum packaging film is used for vacuum sealing of perishable items. Due to the film's versatility in producing vacuum sealed packages of various sizes, its popularity has increased in recent years. As a result, continuous product improvement is required on the part of manufacturers in order to stay competitive. One such improvement has been applying patterns to vacuum packaging bags.
- the bag surfaces sometimes stick together when air is evacuated from the bag during vacuum packaging. This may result in air pockets within the seal and degraded seal integrity.
- manufacturers may imprint or emboss a pattern onto vacuum packaging film used to form the vacuum packaging bags.
- the pattern helps prevent vacuum packaging bag surfaces from sticking together during vacuum packaging by forming channels along the grooves of an imprinted pattern — or forming channels between raised portions of an embossed pattern- — when the surfaces of the bag are face to face.
- the pattern may be applied to one or both of the inner surfaces of the vacuum packaging bag.
- embossed patterns may be less durable than smooth surfaces.
- thicker embossing — or deeper grooves typically consumes more material and may be harder to apply to or form into the film.
- Thicker embossing — or deeper grooves also typically results in thicker vacuum packaging film, which makes the film heavier and less compact so it takes up more space in storage.
- a vacuum packaging film with an improved embossing pattern to reduce embossing thickness, to reduce the concentration of raised areas on vacuum packaging film, or to increase the number of channels formed when the vacuum packaging film is used in a vacuum packaging application.
- the present invention fills these needs by providing a vacuum packaging film with an improved embossed pattern suitable for evacuation of gas from a vacuum packaging bag made of the film.
- the embossed pattern includes a plurality of roughly parallel sequences of substantially collinear ridges. The ridges of a first sequence are offset with respect to the ridges of an adjacent second sequence.
- a method for making vacuum packaging film includes heat extruding a first material onto a spinning cooling roll and heat extruding a second material onto the spinning cooling roll.
- the first and second extruded materials bond and form a film of the first material with a plurality of roughly parallel sequences of substantially collinear ridges of the second material forming a pattern on the film.
- the pattern is operable to form channels suitable for evacuation of gas from a vacuum packaging bag made from the film.
- a vacuum packaging bag made of the vacuum packaging film according to an aspect of the present invention includes a first sheet and a second sheet.
- the first and second sheets are formed of the vacuum packaging film.
- the second sheet has a footprint substantially similar to the first sheet.
- the first and second sheets are arranged with respective second layers facing one another.
- the first and second sheets are sealed on opposing lateral sides and an end side, whereby the first and second sheets form a vacuum packaging bag with an opening for insertion of food or other product.
- the vacuum packaging bag is sealable at the opening.
- a vacuum packaging bag roll suitable for forming vacuum packaging bags, made of the vacuum packaging film according to an aspect of the present invention includes a first sheet and a second sheet.
- the first and second sheets are formed of the vacuum packaging film.
- the second sheet has a footprint substantially similar to the first sheet.
- the first and second sheets are arranged with respective second layers facing one another.
- the first and second sheets are sealed on opposing lateral sides, wherein portions of the bag roll may be cut from the bag roll thereby creating a partially formed bag having opposing ends that are unsealed. Sealing one end of a partially formed bag forms a vacuum packaging bag with an opening at the other end.
- An advantage of the present invention is that the configuration of ridges of an embossed pattern allows gas to flow around blockages through alternative paths. Moreover, a patterned vacuum packaging film can be produced economically.
- FIG. 1 depicts a conceptual view of a vacuum packaging film.
- FIG. 2 depicts alternative vacuum packaging film patterns for the vacuum packaging film depicted in FIG. 1.
- FIG. 3 depicts a conceptual view of layers of a multi-layer vacuum packaging film according to the present invention.
- FIGS. 4A, 4B, 4C, and 4D depict exemplary systems for manufacturing vacuum packaging film in accordance with the present invention.
- FIG. 5 depicts a flowchart illustrating an exemplary method for manufacturing vacuum packaging film in accordance with the present invention.
- FIG. 6 depicts a vacuum packaging bag roll made of vacuum packaging film according to the present invention.
- FIG. 7 depicts a vacuum packaging bag made of vacuum packaging film according to the present invention.
- FIG. 8 is a conceptual view of a cross-section of a vacuum packaging film according to the present invention.
- FIG. 9 depicts a conceptual view of a cross-section of a vacuum packaging film with a channel for evacuation according to the present invention.
- the present invention provides a new embossed pattern for a surface of a vacuum packaging film.
- embossed as used herein, is intended to mean that a pattern is raised or in relief and is not intended to imply a particular technique — such as cold-pressing, extrusion, or imprinting — used to apply the pattern.
- the embossed pattern is operable to form channels suitable for evacuation of gas from a vacuum packaging bag made of the film.
- the pattern due to its advantageous configuration, should reduce the relative concentration and height of embossed ridges on the surface of the film.
- the embossed pattern includes a plurality of roughly parallel sequences of substantially collinear ridges, where ridges of a first sequence are offset with respect to ridges of an adjacent second sequence.
- the offset ridges are operable to form multiple channel paths through which gas flows during evacuation of the vacuum packaging bag. Due to the offset, if a channel becomes clogged or collapsed, gas will seek one of many other alternative paths.
- the vacuum packaging film and an exemplary method for manufacturing the film will now be described. It should be noted that certain extraneous details were left out of the subsequent description in an effort to not unnecessarily obscure the true spirit and scope of the present invention.
- FIG. 1 depicts a conceptual view of a vacuum packaging film 100.
- the vacuum packaging film includes a plurality of ridges 102 arranged as a plurality of sequences of collinear ridges 104.
- the sequences of collinear ridges 104 are parallel to one another,
- the ridges 102 of adjacent sequences of collinear ridges 104 are offset with respect to one another. This offset facilitates rerouting of gas when the ridges 102 form walls of an evacuation channel.
- a gas flow 110 If the gas flow 110 encounters a blockage, the gas flow 110 can seek alternative routes to the left or right of the blockage. In the example of FIG. 1 , the gas flow 110 flows to the right for illustrative purposes only.
- FIG. 2 depicts alternative vacuum packaging film patterns for the vacuum packaging film 100
- FIG. 2 depicts a zigzag pattern 200A, an alternative zigzag pattern 200B, and a wavy pattern 200C.
- ridges 202 of a sequence 204 may be only approximately collinear.
- the sequence 204 may be described as a sequence of substantially collinear ridges.
- ridges of a first series of substantially collinear ridges are not necessarily parallel to the ridges of a second series of substantially collinear ridges. Nevertheless, for the purposes of this application, for any given series of sequences of substantially collinear ridges, if the lines along which the substantially collinear ridges align are parallel to one another, the sequences are referred to as "roughly parallel. " Accordingly, the sequences of substantially collinear ridges of FIG. 2A may be described as roughly parallel.
- the alternative zigzag pattern 200B and wavy pattern 200C are analogous to the zigzag pattern
- FIG. 2 the patterns of FIG. 2 are depicted for exemplary purposes only. A great many different roughly parallel sequences of ridges with an offset would fall within the scope of this aspect of the present invention. Similarly, an uneven pattern (not shown) of ridges could have the effect of providing alternate routes if a channel is blocked.
- FIG. 3 depicts a conceptual view of exemplary layers of a vacuum packaging film 100 according to the present invention.
- the vacuum packaging film 100 includes a structural layer 302, a bonding layer 304, a gas-impermeable layer 306, a bonding layer 308, and a hear-sealable resin layer 310.
- the structural layer 302 provides strength to the multi-layer film.
- the bonding layer 304 bonds the structural layer 302 to the gas-impermeable layer 306.
- the gas-impermeable layer may be made of polyester, polyamide (nylon) or some other material that serves as an oxygen barrier to protect the contents of a sealed bag made from the vacuum packaging film 100.
- a bonding layer 308 bonds the gas-impermeable layer 306 to the heat-sealable resin layer 310.
- the heat-sealable resin layer 310 may be made of a polyethylene resin or any other heat-sealable material that is food safe.
- the heat-sealable material must be food safe because it forms the inner layer of a bag used to store food. In an alternative embodiment, the heat-sealable material need not be food safe.
- the vacuum packaging film 100 could be made with as few as two layers, a gas-impermeable layer and a heat-sealable resin layer, bonded together without a bonding layer between them.
- the bonding layers and structural layer are optional in this embodiment.
- heat-sealable resin layer could be replaced with any sealable material, such as glue.
- FIGS. 4A, 4B, 4C, and 4D depict exemplary systems for manufacturing vacuum packaging film in accordance with the present invention.
- FIG. 4A illustrates an apparatus 400A for manufacturing vacuum packaging film in accordance with an embodiment of the invention.
- the apparatus 400A includes a multi-layer extruder 402 that extrudes a plastic melt 404 onto a roller 406, which may be a cooling roller.
- the roller 406 is embedded with an inverse pattern that turns in the direction of arrow 408.
- the inverse pattern is for imprinting a pattern onto the plastic melt 404.
- the multi-layer extruder extrudes the plastic melt 404
- the plastic melt 404 comes in contact with the turning roller 406.
- As the melt is cooled a pattern is formed on the melt at the same time due to the presence of the inverse pattern.
- a multi-layer vacuum packaging film 410 emerges .
- FIG. 4B illustrates an apparatus 400B for manufacturing vacuum packaging film in accordance with an embodiment of the invention.
- the apparatus 400B is much like the apparatus 400A (FIG. 4A), but includes a cooling plank 422. Instead of the multi-layer extruder 402 extruding plastic melt 404 directly onto the roller 406, the multi-layer extruder 402 extrudes plastic melt 404 onto the cooling plank 422.
- the cooling plank 422 has an inverse pattern. As the plastic melt 404 flows along the cooling plank 422, the plastic melt 404 congeals and is simultaneously imprinted with a pattern, due to the presence of the inverse pattern. The congealed plastic flows onto the roller 406, and a multi-layered, patterned vacuum packaging film 410 emerges as it is pulled along by the roller 406, which may or may not also have an inverse pattern.
- FIG. 4C illustrates an apparatus 400C for manufacturing vacuum packaging film in accordance with an embodiment of the invention.
- the apparatus 400C is much like the apparatus 400A (FIG. 4A), but includes an air knife 432.
- the air-knife 432 selectively etches a pattern onto the melt 404 with concentrated blasts of air 434. Additionally, blasts of air 434 also cause the melt 304 to congeal into multi-layered, patterned vacuum packaging film 410 that is pulled along by the roller 406.
- FIG. 4D illustrates an apparatus 400D for manufacturing vacuum packaging film in accordance with an embodiment of the invention.
- the apparatus 400D is much like the apparatus 400A (FIG. 4A), but includes an inverse vacuum 442.
- the inverse- vacuum 442 selectively "pulls" a pattern onto the melt. Additionally, the inverse vacuum 442 also causes the melt to congeal into multi-layered, patterned vacuum packaging film
- FIG. 5 depicts a flowchart 500 illustrating an exemplary method for manufacturing vacuum packaging film in accordance with the present invention.
- the flowchart starts at block 502 with heat extruding a first material onto a roller.
- the flowchart ends at block 504 with heat extruding a second material onto the roller such that the first and second extruded materials bond and form a film of the first material with multiple roughly parallel sequences of substantially collinear ridges of the second material forming a pattern that is operable to form channels suitable for evacuation of gas from a vacuum packaging bag made of the film.
- a multi-layer extruder 402 is for illustrative purposes only. While the manufacturing technique can produce a vacuum packaging film with the advantageous qualities described herein, some other technique for imprinting a pattern onto a vacuum packaging film will also suffice, as is well-known in the art of vacuum packaging film manufacturing. It should further be noted that, depending on the technique for imprinting the pattern, a multi-layer vacuum packaging film may have the pattern imprinted on one or more of the multiple layers, or the pattern may simply be embossed only on the heat- sealable resin layer.
- FIG. 6 depicts a vacuum packaging bag roll 600 made of vacuum packaging film 100 according to the present invention.
- the vacuum packaging bag roll 600 includes a first sheet 602 of vacuum packaging film 100 bonded to a second sheet 604 of vacuum packaging film 100 on opposing lateral sides 606.
- the second sheet 604 has a footprint that is substantially similar to the footprint of the first sheet 602 so that the sheets fit together.
- the first sheet 602 and second sheet 604 are arranged with respective heat-sealable resin layers 310 (FIG. 3) facing one another. Accordingly, the heat-sealable resin layer 310 may be referred to as the inner layer of a bag roll. Similarly, the structural layer 302 (FIG. 3) may be referred to as the outer layer of a bag roll. Portions of the vacuum packaging bag roll 600 can be cut from the bag roll thereby creating a partially formed bag having opposing ends that are unsealed.
- FIG. 7 depicts a vacuum packaging bag 700 made of vacuum packaging film 100 according to the present invention.
- the vacuum packaging bag 700 includes a first sheet 702 of vacuum packaging film 100 bonded to a second sheet 704 of vacuum packaging film 100 on opposing lateral sides and an end side 706.
- the first and second sheets form the vacuum packaging bag 700 with an opening for insertion of food or other product.
- the vacuum packaging bag is heat-sealable at the opening.
- FIG. 8 is a conceptual view 800 of a cross-section of a vacuum packaging film 100 according to the present invention.
- the embossed pattern as exemplified by the ridge 102, is imprinted on the gas-impermeable layer 306 and the heat-sealable resin layer 310.
- the vacuum packaging film 100 could be made with additional layers, such as the bonding layer 308 (FIG. 3), some or all of which could also be imprinted with the embossed pattern.
- FIG. 9 depicts a conceptual view 900 of a cross-section of a vacuum packaging film 100 with a channel 910 for evacuation according to the present invention.
- a sheet 902 is placed against the packaging film 100 such that the embossed ridges of the vacuum packaging film 100 form walls of the channel 910.
- the sheet 902 may or may not have the same embossed pattern as the vacuum packaging film 100, but an embossed pattern is omitted from FIG. 9 for illustrative purposes only.
- the heat-sealable resin layer 310 is the inner layer and the gas-impermeable layer 306 is the outer layer, also for illustrative purposes only.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Bag Frames (AREA)
- Wrappers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US60/611,114 | 2004-09-17 | ||
US11/185,536 US20060072860A1 (en) | 2004-09-17 | 2005-07-19 | Multi-layer film for forming a vacuum packaging bag and method of manufacture |
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WO2006036275A2 true WO2006036275A2 (fr) | 2006-04-06 |
WO2006036275A3 WO2006036275A3 (fr) | 2006-12-14 |
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PCT/US2005/026037 WO2006036275A2 (fr) | 2004-09-17 | 2005-07-21 | Film multicouche de formation d'un sac d'emballage a vide et son procede de fabrication |
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US (1) | US20060072860A1 (fr) |
WO (1) | WO2006036275A2 (fr) |
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US6983845B2 (en) * | 2002-06-28 | 2006-01-10 | S.C. Johnson Home Storage, Inc. | Recloseable storage bag with user-deformable air vent |
US20040007494A1 (en) * | 2002-07-15 | 2004-01-15 | Popeil Ronald M. | Apparatus and method to more effectively vacuum package foods and other objects |
-
2005
- 2005-07-19 US US11/185,536 patent/US20060072860A1/en not_active Abandoned
- 2005-07-21 WO PCT/US2005/026037 patent/WO2006036275A2/fr active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030155269A1 (en) * | 2001-02-21 | 2003-08-21 | Kyul-Joo Lee | Method for preparing air channel-equipped film for use in vacuum package |
Also Published As
Publication number | Publication date |
---|---|
WO2006036275A3 (fr) | 2006-12-14 |
US20060072860A1 (en) | 2006-04-06 |
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