US20020160167A1 - Multi-layer hermetically sealable film - Google Patents

Multi-layer hermetically sealable film Download PDF

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Publication number
US20020160167A1
US20020160167A1 US09/791,347 US79134701A US2002160167A1 US 20020160167 A1 US20020160167 A1 US 20020160167A1 US 79134701 A US79134701 A US 79134701A US 2002160167 A1 US2002160167 A1 US 2002160167A1
Authority
US
United States
Prior art keywords
layer
film
coating
microns
seal
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.)
Abandoned
Application number
US09/791,347
Other languages
English (en)
Inventor
Michael Bader
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.)
ExxonMobil Oil Corp
Original Assignee
Mobil Oil 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 Mobil Oil Corp filed Critical Mobil Oil Corp
Priority to US09/791,347 priority Critical patent/US20020160167A1/en
Assigned to MOBIL OIL CORPORATION reassignment MOBIL OIL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BADER, MICHAEL J.
Priority to PCT/US2002/004200 priority patent/WO2002068194A1/en
Priority to CA 2437403 priority patent/CA2437403A1/en
Priority to BR0207547A priority patent/BR0207547A/pt
Priority to EP20020706254 priority patent/EP1377449A1/en
Priority to JP2002567533A priority patent/JP2005506213A/ja
Priority to US10/079,685 priority patent/US6794021B2/en
Publication of US20020160167A1 publication Critical patent/US20020160167A1/en
Abandoned legal-status Critical Current

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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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
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Definitions

  • the present invention relates to the art of packaging using multi-layer films, and, in particular, to a new composite multi-layer film for providing hermetic seals to multi-layer film packages.
  • stereoregular polypropylene e.g., oriented polypropylene
  • additional layers in the way of coatings, co-extrusions, laminations, and combinations thereof are added to improve barrier properties of the film.
  • films can be prepared which exclude moisture and oxygen, but permit the passage of light.
  • Barrier properties can also be modified and/or enhanced by treatments such as heat and flame treatment, electrostatic discharge, chemical treatments, halogen treatment, ultraviolet light, and combinations thereof.
  • High-speed horizontal and vertical form/fill/seal apparatus include sealing functions at various stages of the packaging process.
  • individual pouches are formed by folding the multi-layer film in half followed by providing vertical seals along the length of the folded web and separating the pouches along the seals formed by vertical sealing. (Optionally, the bottoms of the pouches can also be sealed). After the pouch thusly formed is filled, the top of the pouch is sealed.
  • a second sealing function is present in a VFFS configuration which consists of a combination top- and bottom-sealing section (with a bag cut-off device in between).
  • the top-sealing portion seals the bottom of an empty bag suspended from the bag forming tube while the bottom portion seals the top of a filled bag.
  • U.S. Pat. No. 3,202,528 describes an oriented polypropylene film having an adherent heat-sealable coating which includes a material from the group consisting of copolymers of vinylidene chloride and acrylonitrile, copolymers of vinyl chloride with vinyl acetate, chlorinated rubbers, nitrocellulose and polyamide which melts below 160° C. and an acidic material provided in an amount of about 20 to about 60% by weight of the film forming material. This adhesive is coated and dried on the film.
  • U.S. Pat. No. 3,202,528 is incorporated herein by reference in its entirety.
  • U.S. Pat. No. 4,292,882 discloses an oriented heat-sealable anti-static polypropylene film manufactured by applying to a surface of a base polypropylene film a heat-sealable olefinic polymer containing between 0.2 and 10% by weight of an anionic hydrocarbyl sulfonate. Andrews, et al. also provide that a slip agent can be incorporated for ease of handling. U.S. Pat. No. 4,292,882 is incorporated herein by reference in its entirety.
  • U.S. Pat. No. 5,049,436 discloses a multi-layer film which is hermetically heat sealable over a broad temperature range. This patent describes a heat-sealable layer which includes an ethylene-propylene copolymer and/or an ethylene-propylene-butene terpolymer with an inorganic anti-block agent and a fatty acid amide. U.S. Pat. No. 5,049,436 is incorporated herein by reference in its entirety.
  • U.S. Pat. No. 5,527,608 describes a biaxially oriented heat sealable multilayer film which has a core substrate of a polyolefin homopolymer. On one surface of the core substrate is a layer of a block copolymer of ethylene and propylene having a melt flow ratio (MFR) of 1 to 10. A high density polyethylene layer may be placed on the other surface of the core substrate, and a heat sealable layer may be placed over the block copolymer layer.
  • MFR melt flow ratio
  • the heat sealable layer may be formed from a terpolymer of ethylene, propylene and butene-1, a random copolymer of ethylene and propylene, a random copolymer of propylene and butene-1 or blends thereof.
  • U.S. Pat. No. 5,527,608 is incorporated herein by reference in its entirety.
  • U.S. Pat. No. 5,888,648 describes a multi-layer, hermetically sealable film.
  • the main film substrate may be oriented polypropylene, optionally having a layer of high density polyethylene on one surface of the polypropylene.
  • On the surface of the polypropylene opposite the high density polyethylene layer is an intermediate layer of polyethylene homo-, co- and terpolymers, amorphous nylon, ionomers or mixtures thereof.
  • a preferred polymer in the intermediate layer is low density polyethylene.
  • U.S. Pat. No. 5,888,648 is incorporated herein by reference in its entirety.
  • U.S. Pat. No. 6,058,680 describes an apparatus and method for forming a hermetically sealed package for a slice of a food item.
  • a web of thermoplastic material is first formed into a tubular arrangement with a hermetic longitudinal seal.
  • means are provided for folding a continuous web of thermoplastic material into V-folded condition and for continuously forming a hermetic seal along the open longitudinal edge of the V-folded web.
  • the hermetic seal is formed between the inner surfaces of the front and rear faces of the web to define a tubular web member.
  • the food item which has been formed into a soft mass is then inserted into the tubular member and the tubular member is flattened to form a thin film tube.
  • Means are provided for forming a hermetically sealed cross-seal which are disposed substantially transverse to the longitudinal forward moving direction of the web.
  • U.S. Pat. No. 6,058,680 is incorporated herein by reference in its entirety.
  • Copending U.S. application Ser. No. 09/435,559 filed Nov. 8, 1999 to Kong et al discloses a multi-layer film having an improved composite structure for providing hermetic seals to packages manufactured in high speed packaging apparatus.
  • the structure of the multi-layer film includes layers A/B/C/D.
  • Skin layer A is formed from polypropylene copolymer with melt flow rate greater than one or linear high density polyethylene with melt index greater than one.
  • Core layer B is formed from polypropylene.
  • Intermediate layer C has the primary function of compliance during sealing
  • sealing layer D has the primary function of providing adhesivity to the completed seal.
  • the sealing layer D includes an antiblocking agent comprising non-distortable organic polymer particles having an average particle size greater than 6 microns.
  • the present invention provides a thermoplastic multi-layer film for forming hermetic seals on packages comprising layer A comprising polyethylene, layer B comprising polypropylene, layer C comprising a copolymer, and an adhesion promoting coating applied to layer C.
  • the present invention provides a multi-layer film and a method of improving multi-layer films whereby hermetic seals can be simply and efficiently formed and whereby excellent seal characteristics are achieved.
  • the present invention includes a core layer B of oriented polypropylene. It is noted that such a polypropylene layer B alone (without additional layers) characteristically has a stiffness or modulus which prevents or significantly reduces the ability to seal the film together where the film is bent to form overlaps or fins.
  • the layered film has good barrier properties and can include a metallized film layer.
  • the layered film can include one or more additional layers selected from the group consisting of oriented polypropylene, ethylene-propylene copolymers, polyethylene terephthalate, polyamide, polyacrylonitrile copolymer, polyvinylidene chloride, fluoro-polymers, ethyl-vinyl alcohol copolymers, and mixtures thereof.
  • Other layers can be barrier resins, tie resins, metallized film, ceramic deposited film (e.g., SiO 4 ), plasma chemical vapor deposited film, and metal, ceramic, plasma chemical vapor.
  • the layered film may be laminated through skin layer A to additional outer webs, such as oriented polypropylene (OPP), polyethylene terephthalate (PET), polyamide, polyethylene, and other mono- or multi-layer films.
  • Layer A can also be metallized and then laminated, through the metal layer, to other films, such as a multi-layer biaxially oriented polypropylene film.
  • Layer C and the coating provide a sealing function and are bonded to layer B.
  • These layers include a layer C, which is directly bonded to layer B, and a coating applied to the layer C.
  • the C layer should has sufficient thickness and has sufficient flow property under sealing conditions to deform and comply with all unfilled space between the sealing jaws during sealing.
  • the term “comply” means to be easily and inelastically forced to occupy all empty space remaining between sealing jaws while the sealing jaws are in the closed or seal position.
  • Polyethylene or polypropylene co- and terpolymers are contemplated for use in the layer C.
  • the layer C material should flow under heat and pressure imposed by jaws of commercial sealing apparatus to occupy all the space between the jaws.
  • the layer C may further comprise inorganic particles, such as solid oxides, having an average particle size greater than 2 microns.
  • inorganic particles of the layer C may be composed of silica (SiO 2 ), metal carbonates (including alkali metal carbonates, such as calcium carbonate), metal silicates (including alkali metal silicates, such as magnesium silicate, and other metal silicates, such as aluminum silicate), metal phosphates (including alkali metal phosphates, such as calcium phosphate), clays, talc, diatomaceous earth, glass and the like.
  • silica SiO 2
  • metal carbonates including alkali metal carbonates, such as calcium carbonate
  • metal silicates including alkali metal silicates, such as magnesium silicate, and other metal silicates, such as aluminum silicate
  • metal phosphates including alkali metal phosphates, such as calcium phosphate
  • clays talc
  • diatomaceous earth glass and the like.
  • inorganic blocking materials include
  • amorphous silica gels having a composition of about 99.7% SiO 2 and a particle size of about 2-4 microns, particularly Syloid 244, having a particle size of about 2.0 microns.
  • Super Floss from World Minerals, a diatomaceous earth of the composition SiO 2 92%, Al 2 O 3 44%, Fe 2 O 3 1.2%, having an average particle size of about 5.5 microns; and synthetic precipitated silicates such as Sipemat 44, available from Degussa Corporation of Akron Ohio, having a composition of SiO 2 42%, Al 2 O 3 36%, Na 2 O 22% and having a 3.5 micron mean particle size.
  • the particle size of the optional inorganic particles of the antiblocking agent may be from 1 microns to 15 microns, in a second embodiment from 2 microns to 8 microns, and in a third embodiment about 4 microns.
  • the loading of the inorganic particles in the layer C may be from 600 ppm to 5,000 ppm, in a second embodiment from 1,000 ppm to 3,000 ppm, and in a third embodiment from 1,500 ppm to 2,500 ppm.
  • the coating can contain a component which readily forms a seal under sealing heat and pressure conditions.
  • a component which readily forms a seal under sealing heat and pressure conditions.
  • Such components can include polyethylene acrylic acid (LTSC) or polyvinylidene chloride (saran), and mixtures thereof.
  • the polypropylene of layer B may be the homopolymer Fina 3371 sold by the Fina Oil Company.
  • the polypropylene of layer B may be a homopolymer or a copolymer.
  • Propylene homopolymers for layer B include isotactic polypropylene, in a second embodiment 80-100% isotactic polypropylene, and in a third embodiment about 95% isotactic polypropylene.
  • the propylene homopolymers may have a melt flow (measured in accordance with the standard ASTM D1238 method) ranging from about 1.2 to about 10 g/10 minutes, and in another embodiment from about 2.5 to about 6 g/10 minutes.
  • Particular propylene copolymers include (98-93)/(2-7) propylene/ethylene copolymers.
  • layer A comprises a linear high density polyethylene having a density of greater than 0.94 g/cc, e.g, about 0.941 to about 0.965 g/cc. It is well known that the density of polyethylene is decreased by copolymerizing ethylene with other olefins, especially those having four or more carbon atoms. Therefore, in another embodiment, it will be understood that the linear high density polyethylenes are free or substantially free of other comonomers. It is also well known that linear high density polyethylenes can be prepared with a variety of coordination-type catalysts.
  • linear high density polyethylene is essentially free of long chain branching.
  • the polypropylene copolymer of layer C may be a copolymer of propylene with one or more olefins, such as ethylene and C 4 to C 10 alpha-olefins.
  • Such polypropylene copolymers may include at least 80 mole % of propylene.
  • the layer C thickness may be from 3 microns to 15 microns, in a second embodiment from 5 microns to 10 microns, and in a third embodiment from 7 microns to 9 microns.
  • the coating thickness may be less than 4 microns, in a second embodiment from 0.1 microns to 3 microns, and in a third embodiment from 0.2 micron to 2 microns.
  • the coating weight is 0.1 to 5.0 gms./msi, in a second embodiment 0.6 to 0.7, or 1.5 to 2.6 gms./msi, and in a third embodiment 0.65 or 2.6 gms./msi.
  • the layer B thickness may be from 5 microns to 25 microns, in a second embodiment from 8 microns to 20 microns, and in a third embodiment from 10 microns to 15 microns.
  • the layer A thickness may be from 0.5 microns to 15 microns, in a second embodiment from 1 microns to 10 microns, and in a third embodiment from 3 microns to 8 microns.
  • the multi-layer film comprising layers A, B, C, and the coating may be uni-axially or bi-axially oriented.
  • Layer C and the coating may have a thickness of from about 15% to about 70% of the total thickness of layers A, B, and C, for example, from about 20% to about 60% of this total thickness.
  • the thickness of the layer C may be from about 10% to about 99% of the total thickness of layer C and the coating, for example, from about 40% to about 95% of this total thickness.
  • the present invention provides a multi-layer film which is hermetically sealable and a method of improving the seal characteristics of multi-layer films which are hermetically sealable in high-speed packaging machines.
  • a hermetic seal to packages formed from multi-layer films, care must be taken to provide a sealing medium which accommodates the nature of the barrier film used for the package, i.e., its modulus or stiffness, thickness, adversity to temperature and pressure imposed under sealing conditions, etc.
  • “Hermetic seals” as used herein means both peelable and unpeelable seals which provide hermetic barrier properties, i.e., does not permit passage of a gas.
  • each layer is primarily designed to fulfill one of the required sealing functions, and certain imperfections in hermetic seals normally associated with high-speed film packaging can be avoided.
  • the outside layer (layer C) primarily meets the requirement of “compliance” throughout the volume between the surfaces of sealing jaws of high-speed packaging apparatus during the sealing function.
  • Another layer or coating (the coating), on the other hand, primarily meets the requirement of providing high performance adhesion under sealing conditions.
  • sealing conditions include both high temperature and pressure imposed on the coating and outside layer, both the outside layer and the coating will participate in both of the sealing functions, i.e., compliance and adhesion.
  • the primary function of the outside layer is to provide compliance while the primary responsibility of the coating is to provide adhesivity.
  • the composition of the outside layer is usually different from the composition of the coating.
  • the outside layer Since the primary function of the outside layer is compliance between the sealing jaws, the outside layer should have two attributes to fulfill its function, sufficient thickness and a flow property to comply with the space between the jaws.
  • Sealing jaws in the context of the present disclosure means the ability to be easily and non-elastically deformed to fill and conform to the entire space between the sealing surfaces of a sealing jaw.
  • Sealing jaws can operate from a temperature of from about 120° C. to about 190° C., and normally are imposed on a film packaging material at a pressure of from about 120 psi to about 180 psi.
  • Sealing jaws are illustrated and described in U.S. Pat. No. 5,888,648.
  • Sealing jaws can be flat, or, in many cases, are provided with teeth.
  • a complementary jaw is used in conjunction with a sealing jaw such that the teeth of the sealing jaw mesh with the valleys the complementary jaw.
  • the surfaces of the jaws close in the sealing position on two multi-layer films, thereby clamping the films therebetween.
  • the volume between the surfaces must be completely filled during sealing. These are the normal sealing conditions under which the outside layer must be capable of compliance.
  • the outside layer should have sufficient material to undergo compliance without leaving a void.
  • the thickness of the outside layer should be such that a continuum of material is provided throughout the space between the surfaces of the sealing jaw.
  • the flow property of the intermediate layer should be such that in the presence of the temperature and pressure exerted during sealing, the material maintains a viscosity which is easily deformed but maintains a non-interrupted mass throughout the space between the sealing surfaces.
  • random copolymers of ethylene and propylene or a random terpolymer of ethylene-propylene-butylene (EPB) have been found to be excellent components for the outside layer C. These components are inexpensive and have the correct compliance requirements for layer C. These components can be used alone or in combination with other components, such as linear low density polyethylene.
  • the coating has the primary responsibility of providing adhesivity.
  • the components of the coating should be selected based on their ability to provide good adhesive seal strength, i.e., adequate tensile strength of the seal.
  • the thickness of the coating is less than the thickness of the outside layer C. It has been found that polyethylene acrylic acid (LTSC) and polyvinylidene chloride (saran) are excellent for use as a component in the coating.
  • the coating can optionally include organic and/or inorganic antiblocks to facilitate film machinability.
  • the coating is an adhesion promoting coating.
  • Coextruding A process for producing a multi-layer film where the melted components of each layer are simultaneously fed through a die which stacks the layers on top of each other
  • Copolymer An elastomer produced by the simultaneous polymerization of two or more dissimilar monomers, like 90% polyethylene and 10% polypropylene
  • Corona treating A process involving an electrical discharge that causes the ionization of oxygen and the formation of ozone
  • Crimp seal A join of two or more layers formed by applying heat and pressure to connect the layers
  • Elevated temperature A temperature from about 100 to about 300 degrees Fahrenheit, or from about 38 to about 150 degrees Centigrade
  • Film A thin material from about 10 to about 50 microns thick
  • Fin seal A join of two or more layers formed by applying heat and pressure to connect the flaps of the layers
  • Hermetic seal A seal which does not permit passage of gas (such as air)
  • High density polyethylene A polyethylene having a density greater than about 0.945 grams per cubic centimeter
  • Lap seal A join of two or more layers formed by applying heat and pressure to connect the overlap of the layers
  • Machine direction Substantially parallel to the direction of the process feed
  • Medium density polyethylene A polyethylene having a density from about 0.935 to about 0.945 grams per cubic centimeter
  • MST Minimum Seal Temperature
  • Plasma Treatment A process involving a neutral mixture of positively and negatively charged particles interacting with an electromagnetic field
  • Polyethylene A thermoplastic polymer produced by polymerizing primarily ethylene monomers
  • Polyethylene acrylic acid A polymer formed from the polymerization of the monomers ethylene and acrylic acid
  • Polyvinylidene chloride A stereoregular thermoplastic polymer produced by polymerizing vinylidene chloride and optionally with other unsaturated compounds. Also known as “Saran”
  • Reverse direct gravure coating process A process to apply a coating wherein cells are engraved into a roll surface (gravure roll), and coating is supplied to the rotating gravure roll from a pan, filling the cells and covering the roll surface, the excess is wiped off by a doctor blade.
  • the gravure roll operates in the opposite direction to the web, and the nip is maintained at very light contact by adjustable roll stops. The wiping action blends the dots together, yielding uniform light coatings.
  • Thermoplastic A high polymer that softens when exposed to heat and returns to its original condition when cooled to room temperature
  • Transverse direction Substantially perpindicular to the direction of the process feed
  • the 90 gauge coextruded biaxially oriented film structure comprised a polypropylene core (Fina 3371), with a 25 gauge (6.3 micron) sealant layer of Chisso 7701 terpolymer. This sealant layer contained approximately 3,000 ppm of a non-migratory slip agent.
  • the other skin layer was a metallizeable HDPE layer and treated to improve adhesion of a coating or aluminum to the film.
  • this film as described above, was corona treated on the sealant (Chisso 7701) side, and primed.
  • a polyethylene acrylic acid (LTSC) coating was applied at a coating weight of approximately 0.65 gms./msi.
  • the film was also coated on the HDPE treated side with 0.65 gm/inch of acrylic coating, to improve packaging machineability and to minimize block rolling.
  • the approximate total gauge of the film after coating was 97 gauge.
  • the resultant biaxially oriented coated film structures had the following sealing properties tested in the Quality Control Lab: 200 gm/in Crimp Seal Strengths (20 psi, 3 ⁇ 4 sec.)* Coating MST 140F 160F 180F 200F 220F 240F 260F 280F No coating 214F 0 0 0 0 400 800 900 1000 EAA Coating 145F 115 500 650 750 1050 1200 1400 1500
  • the monoweb coated film was evaluated on the Fuji Alpha III HFFS Packaging Equipment at 90 fpm.
  • the hermetic sealing window was determined to be approximately 70 F (from 260 to 330 F).
  • the seal strengths were from 1750 to 3000 gm/in.
  • the resultant biaxially oriented coated film structures had the following sealing properties tested in the Quality Control Lab: 200 gm/in Crimp Seal Strengths (20 psi, 3 ⁇ 4 sec.)* Coating MST 140F 160F 180F 200F 220F 240F 260F 280F No coating 214F 15 40 400 1000 800 700 900 1000 PVdC Coating 202F 125 500 750 1050 1350 1500 1500 1600
  • AIRTYTE** shows a broader hermetic window on HFFS machine than
  • AIRTYTE** Acrylic coated on the T side showed good machinability on HFFS machine. As a reminder, uncoated Airtyte showed in the past poor machinability on HFFS machine due to jaw sticking.
  • W.O. LTSC coated AIRTYTE** does not show any big difference versus non cavitated LTSC coated AIRTYTE** regarding sealing on the crimp sealer.
  • the hermetic window of W.O. AIRTYTE** LTSC coated starts at 190° F. on the Fuji machine.
  • the hermetic window of W.O. AIRTYTE** UHB PVdC coated starts at 250° F. on the Fuji machine.
  • the hermetic window of 90 ga. AIRTYTE** UHB PVdC coated started at 290° F.
  • a laminated film structure is prepared from a four layer coextruded biaxially oriented film having layers A, B, C, and D.
  • Layer A of the four layer film is laminated with adhesive to biaxially oriented polypropylene film product (Mobil's 80 MB400).
  • the four layer film is of the structure A/B/C/D, in which the skin layer A of the film is HDPE about 0.8 um thickness, the core layer B of the film is polypropylene about 11 um thickness, the intermediate layer C of the film is 9 um thickness of ethylene-propylene-butene-1 terpolymer having DSC melting point at 131° C., and the sealable skin layer D of the film is 1 um thickness of ethylene-propylene-butene-1 terpolymer having DSC melting point at 126° C.
  • Epostar 1010 available from Nippon Shokubai Co., Ltd., which is a cross-linked copolymer of methylmethacrylate and propylidene trimethacrylate with average particle size about 10 microns.
  • the laminated film is evaluated by using a vertical form fill and seal machine, Fuji FW7700, at the speed of 55 packages per minute. Empty bags at the size 5′′ ⁇ 7-1 ⁇ 2′′ filled with air are sealed at the specified temperatures for fin seal at the back of the bag and crimp seal on both ends of the bag. The bags are put under water vacuum at 10 inches mercury. If there are no bubbles observed, the seal is considered hermetic seal or no leak. From crimp seal and fin seal temperatures combination, the data are generated to obtain the hermetic seal range (i.e. There is no leak in these temperature range). Hermetic seal range for the above laminated structure is observed when fin seal temperature is from 260° F. to 280° F. and crimp seal temperature is from 260° F. to 290° F.
  • a laminated film structure is prepared from four layer coextruded biaxially oriented film having layers A, B, C, and D.
  • Layer A of the four layer film is laminated with polyethylene to an oriented polypropylene film (Mobil's 80MB400).
  • the four layer coextruded biaxially oriented film is the same structure as Example 1.
  • the laminate is run through the same packaging machine and same speed as Example 1. Hermetic seal range for the laminate is observed when fin seal temperature is from 250° F. to 290° F. and crimp seal temperature is from 260° F. to 290° F.
  • a laminated film structure is prepared from four layer coextruded biaxially oriented film having layers A, B, C, and D.
  • Layer A of the four layer film is laminated with polyethylene to an oriented polypropylene film (Mobil's 70 SPWL) L).
  • the four layer coextruded biaxially oriented film is the same structure as Example 1.
  • the laminated film is evaluated by using a vertical foam fill and seal machine, Hayssen Ultimum II, at the speed 55 packages per minute.
  • Empty bags at the size 5′′ ⁇ 7-1 ⁇ 2 41 filled with air are sealed at the specified temperatures for lap seal at the back of the bag and crimp seal on both ends of the bag. Hermetic seal range is observed when lap seal temperatures is from 260° F. to 330° F. and crimp seal temperature at 310° F., and lap seal temperature is from 280° F. to 330° F. and crimp seal temperature at 300° F.
  • a metallized four layer coextruded biaxially oriented film is evaluated.
  • the aluminum vacuum deposition is applied on the skin layer A of the structure A/B/C/D which is the same four layer coextruded biaxially oriented film structure as Example 1.
  • This metallized film is further printed with ink on the top of aluminum layer and a heat resistance lacquer layer is coated on the top of the ink.
  • the final layer structure is (heat resistance lacquer)//ink//(vacuum metallized aluminum)//HDPE//Polypropylene//EPB-terpolymer (I)//EPB-terpolymer (II), where EPB-terpolymer (I) is 9 um thickness of ethylene-propylene-butene-1 terpolymer having DSC melting point at 131° C., and EPB-terpolymer(II) is 1 um thickness of ethylene-propylene-butene-1 terpolymer having DSC melting point at 126° C.
  • the hermetic seal range evaluation procedure is the same as Example 1. A hermetic seal range is observed when the crimp seal temperature is from 240° F. to 320° F. and fin wheel temperature is set at 320° F.

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US09/791,347 US20020160167A1 (en) 2001-02-23 2001-02-23 Multi-layer hermetically sealable film
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CA 2437403 CA2437403A1 (en) 2001-02-23 2002-02-14 Multi-layer hermetically sealable film
BR0207547A BR0207547A (pt) 2001-02-23 2002-02-14 Filme multicamada vedável hermeticamente
EP20020706254 EP1377449A1 (en) 2001-02-23 2002-02-14 Multi-layer hermetically sealable film
JP2002567533A JP2005506213A (ja) 2001-02-23 2002-02-14 気密シール可能な多層フィルム
US10/079,685 US6794021B2 (en) 2001-02-23 2002-02-20 Multi-layer hermetically sealable film

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EP1377449A1 (en) 2004-01-07
BR0207547A (pt) 2004-04-27
CA2437403A1 (en) 2002-09-06
JP2005506213A (ja) 2005-03-03
WO2002068194A1 (en) 2002-09-06
US20020160169A1 (en) 2002-10-31
US6794021B2 (en) 2004-09-21

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