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WO2024173588A1 - Film d'emballage antibuée pour surmonter un fantôme pour des applications alimentaires périssables - Google Patents

Film d'emballage antibuée pour surmonter un fantôme pour des applications alimentaires périssables Download PDF

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Publication number
WO2024173588A1
WO2024173588A1 PCT/US2024/015844 US2024015844W WO2024173588A1 WO 2024173588 A1 WO2024173588 A1 WO 2024173588A1 US 2024015844 W US2024015844 W US 2024015844W WO 2024173588 A1 WO2024173588 A1 WO 2024173588A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
cured
coating
polyolefin film
ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2024/015844
Other languages
English (en)
Inventor
Imtiaz Rangwalla
Camtu JOHNSON
Scott COFIELD
Beau SNIDER
Tavish Shane STOVER
Anne STEPHENS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Energy Sciences Inc
WIKOFF COLOR CORP
Original Assignee
Energy Sciences Inc
WIKOFF COLOR CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Energy Sciences Inc, WIKOFF COLOR CORP filed Critical Energy Sciences Inc
Publication of WO2024173588A1 publication Critical patent/WO2024173588A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/36—Backcoats; Back layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging

Definitions

  • Fresh, perishable food that is being wrapped or stored in a plastic article may contain high levels of moisture.
  • moisture condenses on the interior surface of the sheet or film, resulting in the formation of “fog”.
  • this fogging effect can be due to a number of conditions, including, but not limited to: (a) the temperature of the film surface on the inside falls below the dew-point temperature of the air and water vapor that is within the package headspace; (b) the difference between the surface tension of the condensed water and the critical wetting tension of the film’s surface.
  • the packaging industry can either apply a topical coating or spray to the plastic sheet or film or incorporate an additive into the polymer matrix to minimize the formation of fog.
  • These coatings or additives are commonly referred to as anti-fogging agents and serve as mild wetting agents, exuding to the plastic surface helps change the surface energy between water droplets and film improving transparency.
  • Plastic sheets or films containing these anti-fog agents can be referred to as anti-fog films.
  • Anti-fog films are applied to a wide range of food products to help in the preservation and shelf-life extension of perishable food products such as meat, seafood, dairy, fresh produce, ready to eat food items, bakery and confectionary items and frozen foods.
  • Such anti-fog films are manufactured by adhering multiple films to form a laminate, where the first film contains the ink print and a second film or sealant film containing an anti-fog coating. Finally, the printed film and the sealant film are adhered using adhesives to form an anti-fog laminate.
  • the flexible plastic film has ink printed on the opposite side of the anti-fog or non-anti-fog layer. More specifically, the ink is printed on first film. The reverse or back side this first film is then laminated to a sealant film which contains gas barrier layers to keep the food fresh and an anti-fog coating to avoid water condensation so that one can view the food on grocery shelves.
  • the lamination is done as secondary operation step using conventional polyurethane-based adhesives to the print side of the first film and the non-anti-fog coated side of the sealant film to make a sandwich as follows: First Film/Ink/Adhesive/Sealant Film/anti-fog coating.
  • Laminates of this type containing anti-fog coatings are used to pack fresh foods like meats, cheeses, and vegetables etc., which contain moisture and are sometimes stored in highly humid areas.
  • the first film is typically printed with solvent-based inks containing 30-60% solvents usually applied by flexography or rotogravure printing technology, and the films are reverse printed on BOPP or PET substrates about 15 - 20 micrometers thick.
  • These reverse printed films are then laminated using conventional time cured adhesive technology to anti-fog high barrier sealant films containing an anti-fog-coating on the sealant side.
  • these sealant films are about 20-75 micrometers thick and contain various types of films like polyethylene nylon and ethylene vinyl alcohol EVOH as a gas barrier. These sealant films could be 7 to 9 layers containing these different polymers.
  • Plastic packaging continues to face public pressure as a result of mounting consumer concerns about the impact of waste packaging on the environment.
  • Various governmental agencies around the world have introduced bans on single-use plastic packaging and are encouraging plastics recycling.
  • the search for innovative ways to design more environmentally friendly and sustainable packaging options are being explored.
  • One option is to transition away from a conventional laminated structure to a simplified structure by eliminating the first film as described above.
  • Surface printing can then be done directly on the sealant film containing the anti-fog coating, followed by applying a solvent based clear lacquer to protect the ink/print from scratch and abrasion resistance.
  • the surface printed containing the lacquer and the anti-fog coating, as described above is made into a roll.
  • Anti-fog technologies are products that migrate through the film from the sealant surface to the external surface, which in turn are linked to the chemical interactions between the anti-fog chemistry and the ink chemistry. Anti-fog technologies need to migrate to work on the product, but it should not react with the ink to create a ghosting effect.
  • U.S. Patent Number 6726968 entitled “Antifog/ barrier laminate for use in meat packaging” discloses an anti-fog laminate comprising a multilayered nylon film, a sealant film disposed on one surface of the nylon film via intermediate adhesive coating, an anti-fog coating on the other side of the sealant film and a protective film applied on the other surface of the nylon film.
  • the U.S. patent further discloses that the protective film prevents the interaction between the anti-fog coating in the sealant film with the nylon film.
  • the nylon film comprises a print indicia.
  • the primary object of the present inventive concepts is to provide a novel packaging film that reduces the ghosting effect and provides a novel method of manufacturing the same.
  • Another objective of the present inventive concepts is to provide a cost-effective mono layer packaging film that replaces the conventional multi-material laminated film.
  • Yet another objective of the present inventive concepts is to provide a method for manufacturing a surface printed mono layer packaging film that is easily recyclable in nature compared to the conventional multi material laminates.
  • Yet another objective is to use energy cured inks and coatings to reduce energy consumption in curing, thereby reducing the associated carbon footprints.
  • the present disclosure teaches a method of manufacturing a packaging film comprising the steps of, providing a monolayered or multilayered polyolefin film having first and second sides, applying a coating of an anti-fog agent on the second side of the polyolefin film, applying a LED curable ink on the first side of the polyolefin film and curing the LED curable ink by irradiating with a LED irradiation under controlled conditions to obtain a LED cured ink print, applying a coating of electron beam curable overprint varnish or coating over the LED cured ink print, and the varnish printed film is then cured with Electron beam irradiation to obtain a packaging film.
  • a method of manufacturing a packaging film comprising the steps of providing a monolayered or multilayered polyolefin film having first and second sides, applying a coating of an anti-fog agent on the second side of the polyolefin film and applying an electron beam (EB) curable ink and coating on the first side, (i.e., non-anti-fog side) of the polyolefin film and curing the first side with an electron beam radiation under controlled conditions to obtain a packaging film comprising cured first side.
  • EB electron beam
  • the EB curable ink is not directly cured with the EB irradiation.
  • the EB curable ink is cured together with the EB curable coating (i.e., overprint varnish coating).
  • the first side of the polyolefin film is cured under controlled conditions comprising electron beam treatment at 70 to 125 kV, preferably 110 kV and 3.0 - 7.0 Megarads, preferably 3.5 Megarads at a speed of 200 meters/min in an inert atmosphere where the 02 concentration is ⁇ 150 ppm.
  • the LED irradiation under controlled conditions comprising the LED treatment at 395nm using one or more LED lamps that has an energy output of 18W/cm2, at a speed of 200 feet per minute.
  • the method further comprises winding the first side cured polyolefin film using a winder to form a roll, wherein the EB cured inks and EB curable over printed varnish is exposed to the second side having anti-fog agent coating.
  • a packaging film comprising a polyolefin film having first and second sides, an electron beam (EB) cured print, or a LED cured print disposed on the first side of the polyolefin film and an electron beam (EB) cured over print varnish disposed on top of the electron beam (EB) cured print or on a LED cured print.
  • EB electron beam
  • a layer of an anti-fog agent is coated on the second side of the polyolefin film to create an anti-fog coating.
  • the anti-fog agents are added via extrusion to the polymer matrix.
  • the polyolefin film is a monolayered or multilayered film.
  • the polyolefin film comprising ethylene-based polymers, homopolymers, co-polymers or combinations thereof.
  • the EB curable ink is not directly cured with the electron beam radiation but the EB curable ink is coated with an overprint coating of varnish and is cured using electron beam radiation.
  • a food product package comprising, a tray with a perishable food product with moisture content, and a packaging film according to the various embodiments of the present disclosure, that encloses the food product.
  • the packaging film of the present disclosure may comprise a heat shrink film and/or a non-heat shrink film.
  • the food product packaging film is suitable for lidding applications that stores and covers the fresh foods like meats, vegetables, and fruits.
  • the inventive concepts are not limited to lidding applications but also include any packaging film that covers perishable food products provided with moisture content.
  • a method of manufacturing a packaging film may comprise: providing a monolayered or multilayered polyolefin film having first and second sides; applying a coating of an anti-fog agent on the second side of the polyolefin film; applying an electron beam (EB) curable phase-changing flexographic ink coating on the first side of the polyolefin film; applying a coating of electron beam curable overprint varnish coating over the EB curable ink coating; and curing the first side of the polyolefin film having electron beam (EB) curable phasechanging flexographic ink coating and an electron beam curable varnish coating with an electron beam irradiation under controlled conditions to obtain a polyolefin film having EB cured ink print and overprint varnish in the first side.
  • EB electron beam
  • the method may further comprise winding the first side cured polyolefin film using a winder to form a roll, wherein the EB cured phase-changing flexographic ink print and EB cured over printed varnish is exposed to the second side having anti-fog agent coating.
  • the phase-changing flexographic ink may comprise resins based upon acrylates.
  • the phase-changing flexographic ink may comprise urethane acrylate resins.
  • a packaging film may comprise: a polyolefin film having first and second sides; an electron beam (EB) cured phase-changing flexographic ink print, or a LED cured print disposed on the first side of the polyolefin film; and an electron beam (EB) cured overprint varnish disposed on top of the electron beam (EB) curable phase-changing flexographic ink print or on a LED cured print.
  • EB electron beam
  • the EB curable phase-changing flexographic ink for forming the EB cured print on one side of the polyolefin film may be any one selected from the group comprising of solventbased inks electron beam (EB) curable inks, ultraviolet (UV) curable inks, two-part chemically- curing inks, UV offset inks, gel-based ink, thermoset ink, offset inks, reactive inks, or combinations thereof.
  • EB electron beam
  • UV ultraviolet
  • the EB curable phase-changing flexographic ink print may have a thickness of 1-4 micrometers.
  • the EB cured phase-changing flexographic ink print may not be directly irradiated with EB irradiation.
  • the advantages of the inventive concepts include but are not limited to a novel, cost effective solution to reduce a ghosting effect that appears in anti-fog coated polyolefin films.
  • FIG. 1 illustrates a schematic cross-sectional view of an embodiment of a packaging film according to the present disclosure.
  • FIGS. 2A-2B show an image of a ghosting (fog) test on a surface of the packaging film having been irradiated with LED irradiation and EB irradiation according to one embodiment of the present disclosure after: 1 hour (FIG. 2A), and 24 hours (FIG. 2B).
  • FIGS. 3A-3B show an image of a ghosting (fog) test on a surface of the packaging film having been irradiated with EB irradiation according to one embodiment of the present disclosure after: 1 hour (FIG. 3 A), and 24 hours (FIG. 3B).
  • FIGS. 4A-4B show an image of a ghosting (fog) test on a surface of the packaging film coated with nitrocellulose based flexographic solvent-based inks and conventional two-part solvent-based coating on one side of the polyolefin film after: 1 hour (FIG. 4A), and 24 hours (FIG. 4B).
  • FIGS. 5A-5B show an image of a ghosting (fog) test on a surface of the packaging film having been irradiated with EB irradiation, which lacks overprint varnish coating according to one embodiment of the present disclosure after: 1 hour (FIG. 5A), and 24 hours (FIG. 5B).
  • FIGS. 6A-6B show an image of a ghosting (fog) test on a surface of the packaging film having been irradiated with EB irradiation, which lacks overprint varnish coating according to one embodiment of the present disclosure after: 1 hour (FIG. 6A), and 24 hours (FIG. 6B).
  • FIG. 7A shows the results of the ghosting test from Example 6 (without overprint varnish) after one hour.
  • FIG. 7B shows the results of the ghosting test from Example 6 (without overprint varnish) after 24 hours.
  • FIG. 8A shows the results of the ghosting test from Example 6 (with overprint varnish) after one hour.
  • FIG. 8B shows the results of the ghosting test from Example 6 (with overprint varnish) after 24 hours.
  • inventive concepts relate to a novel, cost-effective and sustainable packaging film that reduces the ghosting effect on the surface of the polyolefin film.
  • anti-fog film refers to a film that covers any humid containing product, preferably food product for providing prevention from the fog or water condensates formation on the surface of the film.
  • Reference to the term “cured” as disclose herein refers to any kind of radiation treatment like electron beam or LED treatment on the surface of the films coated with inks and coating to improve the crosslinking of molecules or reactive sites between the ink, film, and the coating.
  • curable refers to any ink or coatings that can be subjected to curing by means of any radiations like electron beam irradiation, ultraviolet radiation, LED irradiation or by means of thermal radiation.
  • cured overprint coating (otherwise known as overprint varnish) as disclosed herein refers to single or multi component varnish having reactive sites, where the reactive sites are cross-linked or polymerized upon radiation treatment. In other terms that the over print varnish is cured or crosslinked using radiation.
  • Reference to the term “Electron Beam irradiation or treatment” as disclosed herein refers to a technique for using high energy electrons for treating an object to achieve the purpose of curing or crosslinking. The process takes place under elevated temperature and nitrogen atmosphere. Based on the required depth, the electron irradiation varies from keV to MeV range.
  • the apparatus for producing electron beam irradiation comprising an electron gun to deliver electron beam and a magnetic optical system for controlling the way of electron beam on the target material.
  • ethylene-based polymers refers to a formulation having higher amount of ethylene polymer along with one or more monomers or other polymers.
  • Reference to the term “ghosting” as disclosed herein refers to a formation of water droplets or moisture condensates formed on the inner side of the food product containing packages. These water droplets may restrict the view of food enclosed inside the packaging film.
  • Reference to the term “LED irradiation or treatment” as disclosed herein refers to any light emitting diodes that emit light rays for irradiation, which helps in the curing of inks or other coating formulations from liquid state into solid state. The wavelength of the LED light ranges up to 500 nm.
  • polyolefin refers to a thermoplastic polymer material made up of any monomers or polymers like polypropylene, polyethylene, its homopolymer, heteropolymer and copolymers thereof. These polyolefin films are manufactured by any methods like extrusion, co-extrusion casting and adhesive lamination.
  • the extruded films are selected from the group comprising of blown-film extrusion, coextrusion, extrusion coating, free film extrusion, and lamination, casting, and adhesive lamination.
  • Reference to the term “radiation curable ink” (otherwise known as EB curable ink or LED curable ink) as disclosed herein refers to any printing ink that can be cured with the help of electron beam or LED irradiation.
  • the features of the EB curable ink are that it does not include photo initiators, instant curing, and provides less heat generation.
  • a method for manufacturing a packaging film comprising the steps of, providing a monolayered or multilayered polyolefin film having first and second sides, applying a coating of an anti-fog agent on to the second side of the polyolefin film, applying a LED curable ink on the first side of the polyolefin film, curing the LED curable ink by irradiating with LED irradiation under controlled conditions, applying a coating of electron beam curable overprint varnish coating over the LED cured ink print and further, curing the first side of the polyolefin film having LED cured ink print and an electron beam curable varnish coating, with electron beam irradiation under controlled conditions to obtain a polyolefin film having a cured first side comprising a LED cured ink print and an EB cured overprint varnish.
  • a method of manufacturing a packaging film comprising the steps of providing a monolayered or multilayered polyolefin film having first and second sides, applying a coating of an anti-fog agent on the second side of the polyolefin film, applying an electron beam (EB) curable ink coating on the first side of the polyolefin film, applying a coating of electron beam curable overprint varnish coating over the EB curable ink coating, and curing the first side of the polyolefin film having electron beam (EB) curable ink coating and an electron beam curable varnish coating, with electron beam irradiation under controlled conditions to obtain a polyolefin film having a cured first side comprising an EB cured ink print and an EB cured overprint varnish.
  • EB electron beam
  • the EB curing of ink is a one step process where the EB curable ink is coated with an overprint varnish and then the whole ink and coating is subjected to electron beam irradiation treatment to produce EB cured ink and coating.
  • the EB curing of ink is a two-step process where the EB curable ink is cured with EB irradiation in the first step to produce EB cured ink print and then the EB cured ink print is coated with an overprint varnish followed by the second electron beam irradiation treatment to the overprint varnish layer.
  • a method of manufacturing a packaging film comprising the steps of providing a monolayered or multilayered polyolefin film having first and second sides, applying a coating of an anti-fog agent on the second side of the polyolefin film, applying an electron beam (EB) curable ink coating on the first side of the polyolefin film and curing the EB curable ink with electron beam irradiation under controlled conditions to obtain a packaging film.
  • EB electron beam
  • the curing of the ink and overprint coating on one side of the polyolefin film is done at the same time using EB irradiation.
  • the curing of the ink is performed using LED and curing of overprint coating is performed by EB irradiation treatment.
  • the curing of overprint coating is done using EB treatment.
  • the curing of overprint coating is done using LED or Ultraviolet (UV) treatment.
  • the method further comprising the step of winding the one side cured polyolefin film (i.e., first side) using a winder to form a roll, where the radiation cured ink prints and the over printed varnish is exposed to the second side having anti-fog agent coating.
  • the radiation cured ink print and the cured overprint coating reduces the interaction with the anti-fog coating in the sealant side upon winding, thereby minimizing the water condensation that forms on one side of the packaging film.
  • the EB curable ink for forming the print on one side of the polyolefin film is any one selected from the group comprising of solvent-based inks electron beam (EB) curable inks, ultraviolet (UV) curable inks, UV offset inks, gel-based ink, thermoset ink, offset inks, reactive inks, or combinations thereof.
  • EB electron beam
  • UV ultraviolet
  • UV offset inks gel-based ink
  • thermoset ink UV offset ink
  • offset inks reactive inks
  • reactive inks or combinations thereof.
  • the inks are applied to the polyolefin films by various techniques that are well known in the prior art like rotary screen, gravure, flexographic or other techniques.
  • screen, gravure, flexographic, roll, and metering rod coating print techniques, and by in-line, stack, the over print varnish having reactive sites are applied over the ink coating by various techniques that are well known in the prior art.
  • the LED irradiation under controlled conditions comprising the LED treatment at 395nm using one or more LED lamps that has an energy output of 18W/cm 2 , at a speed of 200 feet per minute.
  • the electron beam irradiation under controlled conditions comprising the electron beam treatment at 70-125 kV, preferably 110 kV and 3.0-7.0 Megarads, preferably 3.5 Megarads at a speed of 200 meters/min in an inert atmosphere where the 02 concentration is ⁇ 150 ppm.
  • the electron beam irradiation is performed under inert atmosphere, which removes the oxygen and increases the rate of crosslinking of the reactive sites in the ink or coating and provides improved adhesion of ink or coating over the polyolefin film.
  • the oxygen is removed by means of other gases like carbon dioxide, nitrogen, and argon.
  • the polyolefin film comprises ethylene monomers, polymers, copolymers, homopolymers or combinations thereof.
  • the polyolefin film is a single layered film.
  • the polyolefin film is a multilayered film having one or more skin layers, one or more tie layers, one or more barrier layers and a core layer.
  • FIG. 1 illustrates a packaging film (100) comprising a polyolefin film (20) having first and second sides, an electron beam (EB) cured print or a LED cured print (10) disposed on the first side of the polyolefin film and an electron beam (EB) cured over print varnish (40) disposed on top of the electron beam (EB) cured print or on a LED cured print (10).
  • a packaging film 100 comprising a polyolefin film (20) having first and second sides, an electron beam (EB) cured print or a LED cured print (10) disposed on the first side of the polyolefin film and an electron beam (EB) cured over print varnish (40) disposed on top of the electron beam (EB) cured print or on a LED cured print (10).
  • a layer of an anti-fog agent is coated on the second side of the polyolefin film (20) to obtain an anti -fog coating (30).
  • a layer of an anti-fog agent is coated on the second side of the polyolefin film to create anti-fog coating.
  • the anti-fog agents are added via extrusion to the polymer matrix.
  • a packaging film comprising a polyolefin film having first and second sides, an electron beam (EB) cured ink print is disposed on the first side of the polyolefin film and an electron beam (EB) cured over print varnish disposed on top of the electron beam (EB) cured print.
  • An anti-fog coating is disposed on the second side of the polyolefin film.
  • the EB cured ink print is not directly irradiated using electron beam irradiation.
  • the EB cured ink disposed on one side of the polyolefin film is first covered with an EB curable over print coating of varnish and then both the varnish and ink are cured to form the packaging film to reduce the ghosting effect.
  • a packaging film comprising a polyolefin film having first and second sides, a LED cured ink print is disposed on the first side of the polyolefin film and an electron beam (EB) cured over print varnish disposed on top of the LED cured print.
  • An anti-fog coating is disposed on the second side of the polyolefin film.
  • the EB curable ink print is not directly irradiated using electron beams.
  • the EB curable ink disposed on one side of the polyolefin film is covered with an EB curable over print coating of varnish and then both the varnish and ink are cured to form the packaging film to reduce the ghosting effect.
  • a packaging film comprising a polyolefin film having first and second sides, an EB cured ink print is disposed on the first side of the polyolefin film and an anti-fog coating is disposed on the second side of the polyolefin film. According to this embodiment, there is no overprint varnish coating on top of the EB cured ink print.
  • the EB curable ink for forming the print on one side of the polyolefin film is any one selected from the group comprising of solvent-based inks, electron beam (EB) curable inks, ultraviolet (UV) curable inks, UV offset inks, gel-based ink, thermoset ink, offset inks, reactive inks, or combinations thereof.
  • EB electron beam
  • UV ultraviolet
  • UV offset inks gel-based ink
  • thermoset ink thermoset ink
  • offset inks reactive inks, or combinations thereof.
  • Solvent based inks generally dissolve in substances other than water. Such substances are glycol ether ester, or glycol ester or its derivatives. These solvent-based inks are cured by the evaporation of the solvents present in the ink. Radiation curable inks are the inks that has multiple reactive sites which are crosslinked using radiations like ultraviolet, light emitting diode or electron beam irradiation. Reactive inks are water soluble inks which uses wax or ink for printing, reactive inks generally cured by chemical reaction. Flexographic inks are generally used in printing of materials like packaging materials, cardboard, paper, bags, and others. These films consist of three types, and they are water based, solvent based and UV radiation curable inks.
  • thermoset ink is cured by thermal treatment.
  • inventive concepts are not limited only with the above-mentioned inks but also include other inks that are very well known in the prior art. Typical energy curable inks are described in the U.S. Pat. Nos. 8,729,147, 9,238,740, and 9,404,000.
  • the polyolefin film has a thickness of 20-75 micrometers.
  • the EB cured print has a thickness of 1-4 micrometers.
  • the LED cured print has a thickness of 1-4 micrometers.
  • the antifog coating has a thickness of 10 microns.
  • the EB cured overprint has a thickness of 2-5 micrometers.
  • the polyolefin film is a single layered or multilayered film. In one embodiment, the polyolefin film is a two layered structure. In one embodiment, the polyolefin film is a three-layered structure. In one embodiment, the polyolefin film is a four-layered structure. In one embodiment, the polyolefin film is a fivelayered structure. In one embodiment, the polyolefin film is a six-layered structure. In one embodiment, the polyolefin film is a seven-layered structure. In one embodiment, the polyolefin film is an eight-layered structure. In one embodiment, the polyolefin film is a nine-layered structure.
  • the layers of the polyolefin film comprising one or more of skin layers, one or more of tie layers, one or more of barrier layers or coatings and a core layer.
  • the one or more skin layers is disposed on the outer sides of the polyolefin film, in which the outer side is subjected to further application or treatment of ink and anti-fog coating on its surface.
  • the core layer is the center part of the film, otherwise known as bulk layer.
  • One or more tie layers are present in between the one or more skin layers and the core layer to provide adhesion between the core and one or more skin layers.
  • the polyolefin film further comprising one or more barrier layers like oxygen or gas barrier layers, moisture or water vapor barrier layers that controls the transmission of gas, oxygen, moisture, or water vapor across the polyolefin film there by preventing the nature and freshness of the product present inside the film.
  • barrier layers like oxygen or gas barrier layers, moisture or water vapor barrier layers that controls the transmission of gas, oxygen, moisture, or water vapor across the polyolefin film there by preventing the nature and freshness of the product present inside the film.
  • the polyolefin film is a three-layered structure having one or more skin layer, and a core layer, where the one or more tie layers are optional.
  • the polyolefin film is a four layered structure having one or more skin layer, one or more tie layers, and a core layer.
  • the polyolefin film is a five-layered structured, where it includes one or more skin layers, one or more tie layers, and a core layer.
  • the polyolefin film is a seven layered structure.
  • the polyolefin film preferably comprising of ethylene-based polymers, homopolymers, co-polymers or combinations thereof.
  • ethylene-based polymers are any one selected from the group comprising of polyethylene (PE), low-density polyethylene (LDPE), medium density polyethylene (MDPE), high-density polyethylene (HDPE), linear medium density polyethylene (LMDPE), linear very-low density polyethylene (VLDPE), linear ultra-low density polyethylene (ULDPE), metallocene linear low density polyethylene (MLLDPE) or linear low-density polyethylene (LLDPE).
  • the polyolefin film of the present disclosure is not limited to ethylene-based polymers but also comprising other polymers like ethylene-vinyl acetate (EVA), Ethylene vinyl alcohol (EVOH), co-polymers like ethyl ene-propylene copolymers; ethylenebutene copolymers; ethylene-pentene copolymers; ethylene-hexene copolymers; and ethylene- propylene-diene copolymers (EPDM), nylon, polyethylene terephthalate (PET) comprising heat seal layers and other polymers that are known in the prior art.
  • EVA ethylene-vinyl acetate
  • EVOH Ethylene vinyl alcohol
  • EPDM ethylene-pentene copolymers
  • PET polyethylene terephthalate
  • inventive concepts are not limited only to ethylene based polymers, but also includes butylene, propylene monomers, polymers, copolymers, terpolymers or combinations thereof and nylon.
  • the anti-fog agents that can be formulated and coated on to the second side of the polyolefin film is selected from the group consisting of glycerol monooleate, glycerol monostearate, sorbitan esters, glycerol monoesters, glycerol diesters, surfactants including anionic, cationic, nonionic, ionic and amphoteric surfactants, sorbitan esters of aliphatic carboxylic acids, glycerol esters of aliphatic carboxylic acids, esters of other polyhydric alcohols with aliphatic carboxylic acids, polyoxyethylene compounds, such as the polyoxyethylene sorbitan esters of aliphatic carboxylic acids and polyoxyethylene ethers of higher aliphatic alcohols or blends thereof.
  • the polyolefin film of the present disclosure further comprising one or more formulating agents added in one or more film layers which are selected from the group comprising of anti-block additives, anti-slip additives, slip additives, plasticizers, cavitating agents, flavoring agents, coloring agents, anti-fog agents, fillers, anti-microbial agents, anti-static agents, stabilizers, fillers, or combinations thereof.
  • formulating agents are very well known in the prior art.
  • the polyolefin film is manufactured by any process like extrusion, co-extrusion or other process that are well known in the art. The coextrusion techniques are described in U.S. Pat. Nos.
  • the polyolefin film is oriented in machine direction, according to another embodiment, the polyolefin film is oriented in transverse direction, according to another embodiment, the polyolefin film is oriented in bidirectional orientation.
  • the polyolefin film of the present disclosure is surface treated to alter the surface energy of the film with any of the known techniques like corona treatment, plasma treatment, flame treatment or primer coating. Such treatment increases the adhesion between the ink and the outer layer of the polyolefin film.
  • the polyolefin film of the present disclosure is a heat shrink film, where the film forms a transparent protective covering around the food products present in the tray, which helps to increase the shelf life of the food products like meat, cheese, vegetables, sea foods, etc.
  • the heat shrink film is a multi-layered structure, preferably 3 -5 layered structure, having high oxygen transmission rate of 8-10 cc/m 2 .
  • the heat shrink film decreases in size, or its tension is increased and thereby forming a barrier covering around the food products.
  • the film is transparent in nature and allows to see the food products through the transparent film.
  • a food product package comprising, a tray is provided with a perishable food product with moisture content and a packaging film according to the various embodiments of the present disclosure, which encloses the food product.
  • the packaging film of the present disclosure is a heat shrink film.
  • the food product packaging film is suitable for lidding applications that stores and covers the fresh foods like meats, vegetables, and fruits.
  • a food product package comprising, a packaging film according to the various embodiments of the present disclosure, that encloses a perishable food product with moisture content.
  • the food product comprising, chicken, meat, turkey, breast, beef, pork, lamb, hamster, or other meat products, milk products like cheese, vegetables like carrot, cabbage, capsicum, broccoli, cauliflower, sprouts, radish, lettuce, celery, greens, leafy vegetables, mushrooms, cut vegetables and other vegetables and fruits.
  • the fresh food products are stored in the tray, which is further covered with the packaging film.
  • the packaging film shrink around the food product while applying heat.
  • the food products that are present within the packaging generally contains moisture content, which causes the fog formation on one surface of the packaging film. This fog formation hinders the view of food product present inside the packaging. Further, excessive fog or water condensates cause the food soggy.
  • the radiation cured packaging film of the present disclosure reduces the ghosting effect (i.e., water condensate) on the surface of the film and allows to see the food product through the packaging film without water droplets.
  • a polyolefin film comprising 7 layers of polyethylene or copolymers having thickness of 20 microns was printed with LED Curable flexo inks in the front side of the film.
  • the inks were cured with 395nm LED lamp with an energy output of 18W/cm2, at a speed of 200 feet per minute. Further, the inks were coated with an EB curable overprint varnish and the whole film was cured with EB irradiation at 110 kV 3.5 Megarads at a speed of 200 meters/min in an inert atmosphere where the 02 concentration is ⁇ 150 ppm.
  • the other side of the film is sealant side comprising an anti-fog coating designed to prevent water condensation.
  • the anti-fog coating is a standard hydrophilic coating applied at a thickness of 10 microns.
  • the front side with LED cured ink print and the EB cured over print varnish then was placed in contact with the back sealant side of the film under pressure of 15 psi at 43 Celsius for 72 hours. These conditions simulate the conditions when the printed surface is directly in contact with the anti-fog coating on the sealant side in a roll form after printing on a press.
  • the polyolefin film was placed on a glass jar contained about a quarter of tap water in such a way that the sealant side faced inward towards the jar.
  • the setup simulates the food product covered in a packaging film.
  • the film was wrapped tightly with a rubber band onto the jar.
  • the film wrapped jar was placed in a refrigerator at 4 Celsius. These conditions simulate a food product packaged in a plastic pouch that was kept in a refrigeration in the supermarket.
  • the ghosting effect was then checked after 1 hour and 24 hours from the time the jar was placed in the refrigerator as shown in FIG. 2.
  • Example 2 A polyolefin film comprising 7 layers of polyethylene or copolymers having thickness of 20 microns was printed with EB Curable fl exo inks as taught in US 8729147, US 9238740, US 9404000 in the front side of the film.
  • the EB Curable flexo inks as taught in US 8729147, US 9238740, US 9404000 are also referred to herein as phase-changing flexographic inks.
  • the EB Curable flexo inks include an organic resin that forms a gel of which the gellant is PVB (Polyvinyl Butyral) as defined in US8729147.
  • the gellant helps the ink stay in liquid (flexo) form under shear, but when shear is removed, the ink solidifies into gel form that helps trap the next ink layer.
  • an EB curable over print varnish was applied over the top of the ink. Then the EB Curable flexo inks and EB curable over print varnish were cured at 110 kV 3.5 Megarads at a speed of 200 meters/min in an inert atmosphere where the 02 concentration is ⁇ 150 ppm.
  • the other side of the film is sealant side containing an anti-fog coating designed to prevent water condensation.
  • the anti-fog coating is a standard hydrophilic coating applied at a thickness of 10 microns.
  • the front side with EB cured ink print and the EB cured over print varnish then was placed in contact with the back sealant side of the film under pressure of 15 psi at 43 Celsius for 72 hours.
  • the polyolefin film was placed on a glass jar contained about a quarter of tap water in such a way that the sealant side faced inward into the jar.
  • the glass jar with the water simulates the food product in a packaging.
  • the film was wrapped tightly with a rubber band onto the jar. Then the film wrapped jar was placed in a refrigerator at 4 Celsius. These conditions simulate a food product packaged in a plastic pouch that was kept in a refrigeration in the supermarket.
  • the ghosting effect was then checked after 1 hour and 24 hours from the time the jar was placed in the refrigerator as shown in FIG. 3.
  • a polyolefin film comprising 7 layers of polyethylene or copolymers having thickness of 20 microns (as from Example 2) was coated with a nitrocellulose based flexographic solvent-based inks on one side of the film and the solvent-based ink was further coated with a conventional 2-part solvent-based coating.
  • the nitrocellulose based flexographic solvent-based inks and the 2-part solvent-based coating replaces the radiation curable ink and the overprint varnish coating.
  • This polyolefin film was placed on a glass jar contained about a quarter of tap water in such a way that the sealant side faced inward into the jar. The glass jar with the water simulates the food product in a packaging.
  • the film was wrapped tightly with a rubber band onto the jar. Then the film wrapped jar was placed in a refrigerator at 4 Celsius. These conditions simulate a food product packaged in a plastic pouch that was kept in a refrigeration in the supermarket. The ghosting effect was then checked after 1 hour and 24 hours from the time the jar was placed in the refrigerator as shown in FIG. 4.
  • a polyolefin film comprising 7 layers of polyethylene or copolymers having thickness of 20 microns (as from Example 2) was printed with EB curable Litho offset inks, without any overprint varnish.
  • the EB curable Litho offset inks were cured at 150 kV 3.5 Megarads at a speed of 200 meters/minute in an inert atmosphere where the 02 concentration is ⁇ 150 ppm.
  • the anti -fog coating is a standard hydrophilic coating applied at a thickness of 10 microns and is applied to the non-ink printed side (i.e., sealant side) of the polyolefin film.
  • the front side with EB cured litho offset ink print was placed in contact with the back sealant side of the film under pressure of 15 psi at 43 Celsius for 72 hours.
  • This polyolefin film was placed on a glass jar contained about a quarter of tap water in such a way that the sealant side faced inward into the jar.
  • the glass jar with the water simulates the food product in a packaging.
  • the film was wrapped tightly with a rubber band onto the jar. Then the film wrapped jar was placed in a refrigerator at 4 Celsius. These conditions simulate a food product packaged in a plastic pouch that was kept in a refrigeration in the supermarket.
  • the ghosting effect was then checked after 1 hour and 24 hours from the time the jar was placed in the refrigerator as shown in FIG. 5.
  • a polyolefin film comprising 7 layers of polyethylene or copolymers having thickness of 20 microns was printed with EB Curable Flexo Inks, as taught in US patents US 8729147, US 9238740, US 9404000 without any overprint varnish.
  • the EB curable flexo inks as taught in US 8729147, US 9238740, US 9404000 are also referred to herein as phase-changing flexographic inks.
  • the EB Curable flexo inks include an organic resin that forms a gel of which the gellant is PVB (Polyvinyl Butyral) as defined in US8729147.
  • the gellant helps the ink stay in liquid (flexo) form under shear, but when shear is removed, the ink solidifies into gel form that helps trap the next ink layer.
  • the inks were cured at 150 kV 3.5 Megarads at a speed of 200 meters/minute in an inert atmosphere where the 02 concentration is ⁇ 150 ppm.
  • the anti-fog coating is a standard hydrophilic coating applied at a thickness of 10 microns and is applied to the non-ink printed side (i.e., sealant side) of the polyolefin film.
  • the front side with EB cured flexo ink print was placed in contact with the back sealant side of the film under pressure of 15 psi at 43 Celsius for 72 hours.
  • This polyolefin film was placed on a glass jar contained about a quarter of tap water in such a way that the sealant side faced inward into the jar.
  • the glass jar with the water simulates the food product in a packaging.
  • the film was wrapped tightly with a rubber band onto the jar. Then the film wrapped jar was placed in a refrigerator at 4 Celsius. These conditions simulate a food product packaged in a plastic pouch that was kept in a refrigeration in the supermarket.
  • the ghosting effect was then checked after 1 hour and 24 hours from the time the jar was placed in the refrigerator as shown in FIG. 6.
  • Example 6 the above-described ghosting test in Example 5 was repeated with EB curable Flexo Inks as taught in US patents US 8729147, US 9238740, US 9404000 but these inks were modified to be slightly different from Example 5 so they could be used for a special end-use high shrink applications.
  • the EB Curable flexo inks as taught in US 8729147, US 9238740, US 9404000 are also referred to herein as phase-changing flexographic inks.
  • the inks were cured at 150 kV, 3.5 Megarads at a speed of 200 meters/minute in an inert atmosphere where the O 2 concentration is ⁇ 150 ppm.
  • phase-changing flexographic ink for Example 6 incorporates resins based upon acrylates, which are known to provide flexibility.
  • Acrylate resins may include, but are not limited to, epoxy acrylate, polyester acrylate, urethane acrylate and may be mono-, di-, tri-, multi-functional. They may be aromatic or aliphatic and may be polymeric. These may be used alone, or in combination / mixtures.
  • EB overprint varnish is optional in Example 6.
  • the remaining aspects of the ghosting test were carried out exactly the same as in Example 5.
  • FIG. 7A shows the results of the ghosting test from Example 6 (without overprint varnish) after one hour.
  • FIG. 7B shows the results of the ghosting test from Example 6 (without overprint varnish) after 24 hours.
  • FIG. 8A shows the results of the ghosting test from Example 6 (with overprint varnish) after one hour.
  • FIG. 8B shows the results of the ghosting test from Example 6 (with overprint varnish) after 24 hours.
  • Example 3 (FIG. 4, solvent based inks and coating) had maximum ghosting.
  • the least ghosting was seen in Example 2 (FIG. 3) having EB flexo inks as taught in US patents US 8729147, US 9238740, US 9404000 and EB coating.
  • the films of the present disclosure that were cured by LED irradiation of the ink and electron beam irradiation of the coating, as in Example 1, showed less ghosting than the films of Example 3 (FIG. 4).
  • the least ghosting was observed from Example 2 (FIG. 3) which was cured by electron beam radiation of the inks and coatings.
  • FIGS. 5 and 6 which uses solvent-based inks and coatings.
  • the films according to various aspects or embodiments of the present inventive concepts are better able to control the ghosting effect than the film containing the traditional solvent inks and coatings.
  • the advantages of the present disclosure include, but not limited to, a novel, cost-effective and sustainable solution to reduce the ghosting effect on the surface of the polyolefin film.
  • the anti-fog laminates are manufactured by adhering the two films through gels or adherents whereas the packaging film of the present disclosure is radiation cured monolayered packaging film with reduced plastics.
  • the traditional laminates contain 20-40% more plastic than that of the mono layered structures having surface prints.
  • the packaging films described herein are cheaper than alternatives because they uses less plastic and the associated manufacturing methods are also cheaper because they involve the usage of reduced unit operations (surface printing and coating rather than printing and laminating).
  • the packaging film of the present disclosure helps in reducing carbon footprint by using energy or radiation cured inks and coatings containing significantly less solvents when compared to solvent-based inks which requires no heat treatment.
  • the only requirement is the energy curing equipment, and the amount of energy required for energy curing inks and coatings is estimated to be about one fourth then that of conventional thermal dryers.
  • the traditional laminates contain multi-material structure, which makes it difficult to mechanically recycle the film laminate when compared to surface printed monolayer structures The reason is due to the involvement of multiple materials in multi material structures, whereas and the surface printed structures usually comprise similar materials. Further, the traditional laminates are produced using time cured polyurethane adhesives which creates a problem of gel effects during recycling process. Hence, the radiation cured packaging film of the present disclosure is more sustainable because it is easier to recycle than traditional laminates and does not cause gel effects.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne des films d'emballage antibuée (100) qui réduisent l'effet fantôme et des procédés de fabrication de films d'emballage antibuée. Le procédé peut comprendre le durcissement par rayonnement d'une encre durcissable par rayonnement (10) et d'un vernis de surimpression (40) revêtu sur un premier côté du film de polyoléfine (20). La première couche durcie par rayonnement réduit l'interaction entre l'encre (10) revêtue sur le premier côté avec antibuée (30) revêtu sur le second côté du film de polyoléfine (20) lors de l'enroulement, ce qui permet de réduire l'effet d'effet fantôme sur le film de polyoléfine (20). Selon la présente divulgation, le durcissement par rayonnement comprend une irradiation par EB, une irradiation par DEL ou des combinaisons de celles-ci.
PCT/US2024/015844 2023-02-14 2024-02-14 Film d'emballage antibuée pour surmonter un fantôme pour des applications alimentaires périssables Ceased WO2024173588A1 (fr)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677017A (en) 1983-08-01 1987-06-30 Ausimont, U.S.A., Inc. Coextrusion of thermoplastic fluoropolymers with thermoplastic polymers
US5139878A (en) 1991-08-12 1992-08-18 Allied-Signal Inc. Multilayer film constructions
WO1997019763A1 (fr) * 1995-11-30 1997-06-05 Imtiaz Rangwalla Machine d'application et de polymerisation d'encres polymerisables par des rayonnements
WO2002020276A1 (fr) * 2000-09-08 2002-03-14 Cryovac, Inc. Film antibuee imprime
US6726968B2 (en) 2002-02-22 2004-04-27 Honeywell International Inc. Antifog/barrier laminate for use in meat packaging
US20060204729A1 (en) * 2005-01-24 2006-09-14 Dai Nippon Printing Co., Ltd. Decorating material
EP2730403A1 (fr) * 2012-11-12 2014-05-14 Cryovac, Inc. Films imprimés pour emballage et emballages obtenus à partir de ceux-ci
US8729147B2 (en) 2008-12-22 2014-05-20 Technosolutions Assessoria Ltda Ink for use in a flexographic printing process with wet on wet capability
US20210095135A1 (en) * 2018-04-27 2021-04-01 Filsen Pty Ltd Primer, ink, and varnish compositions and associated printing apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677017A (en) 1983-08-01 1987-06-30 Ausimont, U.S.A., Inc. Coextrusion of thermoplastic fluoropolymers with thermoplastic polymers
US5139878A (en) 1991-08-12 1992-08-18 Allied-Signal Inc. Multilayer film constructions
WO1997019763A1 (fr) * 1995-11-30 1997-06-05 Imtiaz Rangwalla Machine d'application et de polymerisation d'encres polymerisables par des rayonnements
WO2002020276A1 (fr) * 2000-09-08 2002-03-14 Cryovac, Inc. Film antibuee imprime
US6726968B2 (en) 2002-02-22 2004-04-27 Honeywell International Inc. Antifog/barrier laminate for use in meat packaging
US20060204729A1 (en) * 2005-01-24 2006-09-14 Dai Nippon Printing Co., Ltd. Decorating material
US8729147B2 (en) 2008-12-22 2014-05-20 Technosolutions Assessoria Ltda Ink for use in a flexographic printing process with wet on wet capability
US9238740B2 (en) 2008-12-22 2016-01-19 Technosolutions Assessoria Ltda Apparatus for flexographic printing process with wet on wet capability
US9404000B2 (en) 2008-12-22 2016-08-02 Technosolutions Assessoria Ltda Flexographic printing process with wet on wet capability
EP2730403A1 (fr) * 2012-11-12 2014-05-14 Cryovac, Inc. Films imprimés pour emballage et emballages obtenus à partir de ceux-ci
US20210095135A1 (en) * 2018-04-27 2021-04-01 Filsen Pty Ltd Primer, ink, and varnish compositions and associated printing apparatus

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