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WO2023228197A1 - Film de formation de blister en pet - Google Patents

Film de formation de blister en pet Download PDF

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Publication number
WO2023228197A1
WO2023228197A1 PCT/IN2022/050657 IN2022050657W WO2023228197A1 WO 2023228197 A1 WO2023228197 A1 WO 2023228197A1 IN 2022050657 W IN2022050657 W IN 2022050657W WO 2023228197 A1 WO2023228197 A1 WO 2023228197A1
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WO
WIPO (PCT)
Prior art keywords
layer
film
pet
range
copolymer
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/IN2022/050657
Other languages
English (en)
Inventor
Ashok Chaturvedi
Anantshree Chaturvedi
Pramod Laxmikantrao Sirsamkar
Ram Gopal
Arvind Kumar
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.)
Uflex Ltd
Original Assignee
Uflex Ltd
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 Uflex Ltd filed Critical Uflex Ltd
Publication of WO2023228197A1 publication Critical patent/WO2023228197A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/09—Layered products comprising a layer of metal comprising metal 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 comprising polyesters
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/181—Acids containing aromatic rings
    • C08G63/183—Terephthalic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • 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
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/24—Organic non-macromolecular 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • 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
    • B32B2307/738—Thermoformability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers

Definitions

  • thermoformable packaging film More particularly, the present invention relates to thermoformable packaging film used for packaging medicines and pharma/edible products.
  • the flexible packaging of edibles such as food items, medical or pharmaceutical products, industrial goods, and the like is an ever growing industry.
  • the creation of flexible packaging materials is usually a multi-step process.
  • Converters, or the producers of flexible packaging films are companies that typically initially print flexible films, layer, slit and supply the flexible web stock to an end-user.
  • Such web stocks are then chosen for printability, barrier properties, clarity, scuff resistance, heat-sealability, and several other technical and cost considerations for use in the final product.
  • the web stocks, after creation and selection are then further processed on a product packaging line to create a pouch, bag, tray, lid, blister or similar structure at the point of use.
  • That creation of the end-use package subsequently allows for an increased freshness or shelf-life extension for many commodities. Indeed, it is a goal within the industry to increase shelf-stability for a range of food and medical materials, while also presenting an appealing packaged product to the consumer.
  • a well is a well-known packaging methodology to provide for the easy packaging of meats, medical devices, medicines, snacks and other materials.
  • the creation of a cavity, or well can be accomplished through a combined heat and suction by vacuum process that draws the web into cavity, whereby the cavity is designed to provide the overall volume needed for packaging the targeted commodity. See, for example, U.S. Pat. No. 3,496,143, which is incorporated herein by reference.
  • nylon films have been used in combination with aluminum foil to create many cavity structures.
  • nylon films are known to have high elongation properties and are thus well suited for thermoforming and cold forming processes.
  • the flat web materials Within the molding process itself, it is often necessary for the flat web materials to be able to stretch and distort uniformly under heat and pressure to the desired mold volume.
  • Rheological properties of the material dictate the amount of deformation under an applied stress, strain recovery after elimination of the applied load, and permanence of the strain.
  • tan delta values from torsional stress/strain experiments are typically higher at low temperatures and are maximized at the glass transition temperatures of the materials.
  • thermoforming The importance of these principles to thermoforming can be found, for example, in “Importance of elongation properties of polymer melts for film blowing and thermoforming”; Polymer Engineering & Science Volume 46, Issue 9, pages 1190-1195, September 2006, which is further incorporated herein by reference.
  • a typically desired input web may be any combination of printed material, barrier webs, adhesives, sealable materials, and the like.
  • all components of the flexible web have the capability to distort uniformly into the mold structure, as differences in moldability between the discontinuous web-stocks of the flexible web can cause molding issues like splitting, uneven distortion, crystallization, or other defects capable of diminishing the suitability of the molded web for the end-use application.
  • thermoplastic materials like polyethylene, polypropylene, nylon, polystyrene, polyethylene terephthalate (PET), polylactic acid, and other thermoplastic commodities to produce films.
  • PET polyethylene terephthalate
  • Each base polymer, or resin has intrinsic technical attributes like barrier properties, optical clarity, hardness, surface energy, softness, etc. that makes their selection for the end-use need appropriate.
  • Extruding these thermoplastic polymers into web structures and orienting them into thin films is an important industrial process to induce further enhanced properties into polymeric materials. Stretching and orientation are appreciated in the art to improve tensile and elongation properties, tear properties, scuff resistance, etc.
  • PVC sheet For pharma and medical devices in rigid or semi-rigid blisters PVC sheet is commonly used however this material is not considered good for human exposure having carcinogenic properties and often has heavy metal content due to many additives. Therefore, it is also appreciated in the art to select a base resin and filming process capable of creating a suitable film substrate for the technical needs in a flexible packaging web.
  • PET is a material with excellent barrier, clarity, printability, and hardness properties. Film forming and orientation of that material can be used to create thin profile webs with excellent properties for use in flexible packaging. Typically, such PET films have high thermal stability and low subsequent moldability properties. In fact, although traditional biaxially-oriented PET (BOPET) films can be produced with subsequent down-stream moldability, the moldability is generally not high. Alternatively, however, high thermoforming with PET films can be achieved if the films are not oriented, or are monoaxially oriented as described, for example, in U.S. Pat. No. 4,073,857, which is also incorporated herein by reference.
  • BOPET biaxially-oriented PET
  • thermoformable film It is an object of the present invention to provide a multilayer thermoformable film.
  • PVC poly vinyl chloride
  • thermoformable film that is non-carcinogenic and environment friendly.
  • thermoformable packaging film More particularly, the present invention relates to thermoformable packaging film used for packaging medicines, medical devices and pharma/edible products.
  • An aspect of the present invention provides a multilayer thermoformable film comprising a composite structure having at least three co-extruded layers, said multilayer film comprising: a top layer of the composite structure comprises a polyethylene terephthalate (PET) copolymer consisting essentially of 12% to 15.5% by weight of the copolymer; a bottom layer of the composite structure comprises a layer of PET consisting essentially of 69% to 79% of the weight of the total polymer layers; and a core layer of the composite structure comprises PET copolymer consisting essentially of 12% to 15.5% by weight of copolymer.
  • PET polyethylene terephthalate
  • total thickness of the multilayer thermoformable film is in a range of 150-300 microns.
  • thickness of the top layer is in a range of 20-55 microns
  • the core layer is in a range 10-45 microns
  • the bottom layer is in a range of 120 200 micron.
  • the top layer is a heat sealable layer and having an outer surface opposite the bottom layer.
  • the outer surface of the top layer is heat-sealable directly to a lacquer coated aluminum foil to be used as lidding substrate.
  • the copolymer of PET is isophthalic acid based.
  • the least three co-extruded layers are biaxially-oriented PET(BOPET) having: melting point in a range of 190°C to 220°C as measured by differential scanning calorimetry (DSC) upon a first heating; and a thermoformed depth volume of less than or equal to 200%.
  • BOPET biaxially-oriented PET
  • machine direction and transverse direction total elongation is in a range of 150% to 350%.
  • crystallization temperature of co-extruded at least three layers is in the range of 90°C to 156°C.
  • stretching ratio in machine direction and transverse direction is in a range of 2.0% to 2.6%.
  • a blister package for packaging a product comprising: a multilayer thermoformable fdm comprising a composite structure having at least three layers, said multilayer fdm comprising: a top layer of the composite structure comprises a polyethylene terephthalate (PET) copolymer consisting essentially of 12% to 15.5% by weight of the copolymer; a bottom layer of the composite structure comprises a layer of PET consisting essentially of 69% to 79% of the weight of the total polymer layer; and a core layer of the composite structure comprises PET copolymer consisting essentially of 12% to 15.5% by weight of copolymer, wherein the top layer is a heat sealable layer and having an outer surface opposite the bottom layer, wherein the outer surface of the top layer is heat-sealable directly to a heat sealable fdm to be used as lidding substrate of the blister package.
  • PET polyethylene terephthalate
  • the lidding with heat sealable layer comprises any of a lacquer coated aluminum, and a heat sealable PET (HSPET) fdm.
  • FIG. 1 illustrates an exemplary representation of multiple layers of thermoformable packaging fdm in accordance with an embodiment of the present invention.
  • FIG. 2 illustrates an exemplary representation of multiple layer fdm with formed well or a cavity in accordance with an embodiment of the present invention.
  • FIG. 3A illustrates exemplary representation of steps for forming a blister package starting from web of co-extruded multilayer fdm and web of lacquer coated aluminum foil in accordance with an embodiment of the present invention.
  • FIG. 3B illustrates an exemplary representation of blister package in accordance with an embodiment of the present invention.
  • thermoformable packaging film More particularly, the present invention relates to thermoformable packaging film used for packaging medicines, medical devices and pharma/edible products etc.
  • An aspect of the present invention provides a multilayer thermoformable film comprising a composite structure having at least three co-extruded layers, said multilayer film comprising: a top layer of the composite structure comprises a polyethylene terephthalate (PET) copolymer consisting essentially of 12% to 15.5% by weight of the copolymer; a bottom layer of the composite structure comprises a layer of PET consisting essentially of 69% to 79% of the weight of the total polymer layer; and a core layer of the composite structure comprises PET copolymer consisting essentially of 12% to 15.5% by weight of copolymer.
  • PET polyethylene terephthalate
  • total thickness of the multilayer thermoformable film is in a range of 150-300 microns.
  • thickness of the top layer is in a range of 20-55 microns
  • the core layer is in a range 10-45 microns
  • the bottom layer is in a range of 12200.
  • the top layer is a heat sealable layer and having an outer surface opposite the bottom layer.
  • the outer surface of the top layer is heat-sealable directly to a lacquer coated aluminum foil to be used as lidding substrate.
  • the copolymer of PET is isophthalic acid based.
  • the least three co-extruded layers are biaxially-oriented PET (BOPET) having: melting point in a range of 190°C to 220°C, as measured by differential scanning calorimetry (DSC) upon a first heating; and a thermoformed depth volume of less than or equal to 200%.
  • BOPET biaxially-oriented PET
  • DSC differential scanning calorimetry
  • machine direction and transverse direction total elongation is in a range of 150% to 350%.
  • crystallization temperature of co-extruded at least three layers is in the range of 90°C to 156°C.
  • stretching ratio in machine direction and transverse direction is in a range of 2.0% to 2.6%.
  • a blister package for packaging a product comprising: a multilayer thermoformable fdm comprising a composite structure having at least three layers, said multilayer fdm comprising: a top layer of the composite structure comprises polyethylene terephthalate (PET), and a copolymer consisting essentially of 12% to 15.5% by weight of the copolymer; a bottom layer of the composite structure comprises a layer of PET consisting essentially of 69% to 79% of the weight of the total polymer layer; and a core layer of the composite structure comprises polyethylene terephthalate (PET), and copolymer consisting essentially of 12% to 15.5% by weight of copolymer, wherein the top layer is a heat sealable layer and having an outer surface opposite the bottom layer, wherein the outer surface of the top layer is heat-sealable directly to a heat sealable fdm to be used as lidding substrate of the blister package.
  • a multilayer thermoformable fdm comprising a composite structure having at least three
  • the heat sealable layer comprises any of a lacquer coated aluminum foil, and a heat sealable PET (HSPET) fdm.
  • FIG. 1 illustrates an exemplary representation of multiple layers of thermoformable packaging film in accordance with an embodiment of the present invention.
  • the present invention provides a thermoformable packaging film (interchangeably referred to as formable film 100 or thermoformable fdm 100 hereinafter) 100.
  • the thermoformable film 100 comprises a composite structure of three co-extruded layers.
  • the three co-extruded layers comprise atop layer 102, a core layer 104 and a bottom layer 106.
  • the top layer 102 of the thermoformable fdm 100 comprises a polyethylene terephthalate (PET) copolymer consisting essentially of 12% to 15.5% by weight of the copolymer such that thickness of the top layer is about 20-55 microns.
  • the bottom layer 106 comprises a layer of the PET copolymer consisting essentially of 69% to 79% of the weight of the total polymer layer such that thickness of the bottom layer is about 120-200 microns.
  • the core layer 104 comprises PET copolymer consisting essentially of 12% to 15.5% by weight of copolymer such that thickness of the core layer is about 10-45 microns.
  • the total thickness of the thermoformable film is in the range of 150-300 microns.
  • the copolymer includes isophthalic acid etc.
  • thermoformable film 100 including the formable films, and processes for producing and using the Thermoformable film 100.
  • the presently-disclosed subject matter includes BOPET (PET) films that are capable of thermoforming structures including such PET films, and methods of making and using the thermoformable PET films and their structures.
  • PET BOPET
  • thermoformable film 100 that comprises one or more BOPET layers.
  • such a thermoformable film 100 includes a metaphase with a melting point of about 190°C to 220°C. as measured by differential scanning calorimetry (DSC) upon a first heating.
  • the formable film has a thermoformed depth of less than or equal to about 200%. As shown in FIG. 2 the thermoformed depth comprises a depth or cavity or well 202.
  • the formed well or cavity comprises an inner side of formed cavity 202 and outer side of formed cavity 204.
  • the inner side if formed cavity 202 is utilized for storage of product that includes edible items, or medical or pharmaceutical items etc.
  • the inner side of formed cavity 202 is non- carcinogenic and can be used for storing the edible items for a longer period of time.
  • the formable film has a machine direction total elongation percentage of about 150% to about 350%. In some embodiments, the formable film has a transverse direction total elongation percentage of about 150% to about 350%.
  • the metaphase of each of the biaxially-oriented polyethylene terephthalate (BOPET) layers is generally configured to increase one or more properties of the film relative to a conventional BOPET film.
  • the increased property of the formable film is selected from tensile strength, drawability, formability, or a combination of those properties.
  • the BOPET Thermoformable film 100 have a machine direction tensile strength of greater than about 500 kgf/cm at 25°C; a transverse direction tensile strength of greater than about 1000 kgf/cm at 25°C; a machine direction total elongation percentage measured at 25°C of greater than 270%; and a transverse direction of greater than 130%
  • At least one of the polyethylene terephthalate layers is comprised of a polyethylene terephthalate homopolymer or is comprised of polyethylene terephthalate copolyester.
  • at least one of the polyethylene terephthalate layers includes silica.
  • the one or more polyethylene terephthalate layers are comprised of at least two, at least three, at least four, or more BOPET layers.
  • a formable film is provided having three BOPET layers, and in certain embodiments, one of those three layers includes silica.
  • a process for producing a formable film includes an initial step of producing one or more BOPET layers.
  • the process then includes: a step of stretching the one or more BOPET layers in a machine direction at a temperature of about 64°C. to about 74°C., at a draw percentage of about 180% to about 250%, or a combination thereof; and a step of stretching the one or more BOPET layers in a transverse direction at a temperature of about 83°C. to about 110°C., at a draw percentage of about 108% to about 250%, or a combination thereof.
  • subsequent to the stretching steps the process includes crystallizing the one or more layers at a temperature of about 90°C. to about 156°C.
  • the crystallizing step is performed at a temperature of about 90°C. to about 156°C. In some embodiments, the temperature is varied according to the number of layers, coatings, and thickness of the film. In some embodiments of the process, the step of crystallizing the film is performed at a temperature of about 156°C
  • a process for producing a formable film includes a further step of allowing the film to relax to further induce a metaphase in the film.
  • the formable film is allowed to relax at a temperature of about 50°C. to about 60°C.
  • the formable film is allowed to relax at a temperature of about 59°C.
  • the relaxation percentage at which the formable film is allowed to relax can be varied according to final desired properties of the formable film.
  • the formable film is allowed to relax to a relaxation percentage greater than about 2%. In some embodiments, the relaxation percentage is about 3%.
  • a formable film that includes one or more BOPET layers, and that includes a metastable phase in which the metastable phase has a phase transition temperature of about 50°C to 74°C. less than the crystalline melting point of the film as measured by differential scanning calorimetry.
  • the formable film is capable of forming a cavity with little spring -back force.
  • the Thermoformable fdm 100 described herein can also be included as part of a layer structure.
  • a layer structure includes a formable fdm including one or more BOPET fdms with the formable fdm having a metaphase as described herein above and also having a thermoforming depth of greater than about 200% when compared to traditional biaxially-oriented PET fdms.
  • one or more additional layers are layered to the one or more BOPET layers to thereby produce the layer structure.
  • the one or more additional layers of the layer structure are selected from an aluminum foil layer and a polyvinyl chloride layer.
  • the one or more additional layers are layered to the one or more BOPET layers with an adhesive.
  • a layer structure that includes a single BOPET layer, an aluminum foil layer layered to the single BOPET layer, and a polyvinyl chloride layer layered to the aluminum foil layer.
  • an exemplary layer structure includes a first BOPET layer and a second BOPET layer, and an aluminum foil layer interposed between the first BOPET layer and the second BOPET layer.
  • the first BOPET layer includes an isophthalate copolyester top layer 102.
  • the layer structures can also include properties suited for a particular end use.
  • the layer structure has a puncture strength greater than about 20 Kgf.
  • the process comprises providing a layer structure including: a formable film having one or more BOPET layers, and having a metaphase configured to increase a property of the formable film; and one or more additional layers layered to the one or more BOPET layers.
  • the layer structure subsequent to providing the layer structure, the layer structure then undergoes cold or hot forming into a desired shape.
  • the BOPET layers used to produce the layer structures include a metaphase configured to increase a property of the film selected from the group consisting of tensile strength, drawability, thermoformability, and combinations of these properties.
  • FIG. 3A illustrates exemplary representation of steps for forming a blister package starting from web of co-extruded multilayer film and web of aluminum lidding in accordance with an embodiment of the present invention.
  • process for producing blister package 300 comprises a web 304 of thermoformable film 100.
  • the thermoformable film 100 using thermal or cold forming technique is used for making well or cavity 316 on the thermoformable film 100.
  • the film 100 is heated with a heating plate 308 and the heated film 100 is then pressed between a forming top plate 312-1 from the top layer 102 side of the film 100.
  • the forming top plate 312-1 comprises one or more plugs that presses the heated film 100 with bottom forming cavities 312-2 at the bottom such that the top forming plate 312-1 presses the film 100 against the bottom forming cavities 312-2 thereby creating cavities 316.
  • the creation of the cavity from the film 100 can be assisted with air pressure from top plate side or vacuum application from the bottom forming cavities side or combination of both.
  • the negative pressure (vacuum) on the bottom side of the film over the bottom forming cavities 312-2 provides a suction force to mold the heated film 100 into the final desired shape as per cavities.
  • Creation of the cavities 316 based on size and shape is also performed with pressure thermoforming. Sometimes for intricate shape and deep drawn cavities, a combination of vacuum and pressure is used with shaped plugs pushing the heated film 100 into the cavities for forming.
  • product feeding 314 is performed to feed a product 310 in the formed cavities 316.
  • a lidding layer received from a web 302 of the lidding material is applied to the formed cavities 316 to seal the product 310.
  • the lidding substrate 302 can be a lacquer 320 coated aluminum layer 306 that is heat sealed to product-feeding 314 side of the thermoformable film 100.
  • the lidding layer is a heat sealable PET (HSPET). It would be apparent to the person skilled in the art that the lacquer coated lidding substrate would be appropriate for packaging products 310 such as pharmaceutical products such as medicines, tablets or capsules etc., and the lidding substrate of HSPET would be appropriate for sealing edible products such as food items, fruits, vegetables, pre-cooked items, semi-cooked items and the like.
  • the heat-sealed blister package 300 is cut off after a predetermined length as blister package 300, as shown in FIG. 3B.
  • Materials in the lidding substrate comprise lacquer coated aluminum foil, heat sealable PET (HSPET) film etc.
  • PET film was prepared via a conventional sequential biaxial orientation machine having a single screw mainline extrusion train and a twin screw subextrusion process. PET pellets having a desired intrinsic viscosity were fed into the main extrusion line, while a blend of standard PET pellets and silica-filled PET pellets were fed into the sub-extrusion process, such that the materials could be melted separately and then layered together in a feed-block to produce a desired molten structure (e.g., an A/B/C molten structure) in a multilayer extrusion T-die. The layered PET material or layer emerging from the extrusion die was then quenched on a chilled casting drum to produce a thick, amorphous film structure.
  • PET polyethylene terephthalate
  • That amorphous film is subsequently stretched in the machine direction (MD), or long direction axis of the film, utilizing a heater roller train.
  • MD machine direction
  • TD transverse direction
  • Table- 1 below provides exemplary processing parameters used to produce the different thicknesses of multiplayer PET film made in accordance with the presently-disclosed subject matter.
  • the two-step process described above induces the biaxial orientation of the PET polymer chains in the easily formable PET film, imparting tensile strength and other desired properties.
  • thermoformable film 100 Measured properties of the Inventive samples with different co-polymer content, with the measurement comparative examples of thermoformable film 100 for puncture force, stiffness and depth and mechanical analysis.
  • thermoformable PET films made in accordance with the presently-disclosed subject matter
  • the thermoformable PET film and control film were tested on a Dynamic Mechanical Analysis (DMA) machine at various temperatures and the modulus properties at low stretching was measured. Conditions of testing were as described by ASTM D 882. Table-2 and 3 below show the results of the testing for tensile strength, elongation and puncture force, as critical functional parameters.
  • DMA Dynamic Mechanical Analysis
  • Lloyd universal tester is used to measure tensile, elongation and puncture properties of 1" wide test specimen.
  • the Lloyd tensile tester has an enclosed chamber, which is temperature controlled, and the test specimen is pulled by placing between set of grips. The tensile strength is reported on HMI at various set temperatures.
  • thermoformability of the films was subsequently evaluated and analyzed. Briefly, to measure the thermoformability of the films, an aluminum block was assembled to form a circular mold 4 inches in diameter and 1.25 -inch-deep (volumc ⁇ 257 ml) with a vacuum line attached to the base. A 6.5 inch 2 of the film to be tested was placed over the open top of the mold and held in place with a flange to form an airtight seal. The mold was then placed into a preheated forced-air oven at a temperature 70°C to 80°C above the target forming temperature.
  • the surface temperature was monitored by a thermocouple and when the target temperature reached, a vacuum of 26.5 inches of Hg below ambient was applied for 5 seconds (controlled using a PLC). The mold was then immediately removed to avoid shrinkage. To measure the volume, a very light vacuum (approximately 1 inFig) was applied to pull the formed film into shape without further deforming the film, and water from a graduated cylinder was then carefully poured until the surface tension snapped the meniscus to the lower edge of the flange.
  • the depth of the cavities can also be verified by using Vernier caliper keeping the beam edge on the multilayer film surface and opening the jaws such that depth measuring blade enters into the cavity and touches the lower surface of the cavity. The depth reading is noted down from the scale in mm.
  • thermoformable PET film Upon analysis of the results from the comparison of the thermoformable PET film to the PVC film at thicknesses of 180 pm, it was found that the thermoformable PET film exhibited an increased machine direction elongation percentage, an increased transverse direction elongation percentage, and increased machine direction tensile strength, an increased transverse direction tensile strength, and a higher increase in maximum volume as compared to the PVC film and as described in Table- 4.
  • the present invention provides a multilayer thermoformable film.
  • the present invention provides a multilayer thermoformable film that replaces poly vinyl chloride (PVC) film with polyester-based film.
  • PVC poly vinyl chloride
  • the present invention provides e a multilayer thermoformable film that produces wider BOPET line.
  • the present invention provides a multilayer thermoformable film that is cost effective.
  • the present invention provides a multilayer thermoformable film that is non carcinogenic and environment friendly.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

Selon un mode de réalisation de la présente invention, un film thermoformable multicouche comprend une structure composite ayant au moins trois couches co-extrudées. Dans ledit film multicouche : une couche supérieure de la structure composite comprend un copolymère de polyéthylène téréphtalate (PET) constitué essentiellement de 12 % à 15,5 % en poids du copolymère ; une couche inférieure de la structure composite comprend une couche du copolymère PET constituée essentiellement de 69 % à 79 % en poids de la couche polymère totale ; et une couche centrale de la structure composite comprend un copolymère PET constitué essentiellement de 12 % à 15,5 % en poids de copolymère. Le film thermoformable produit est du BOPET plus large avec un coût réduit et est non carcinogène.
PCT/IN2022/050657 2022-05-24 2022-07-22 Film de formation de blister en pet Ceased WO2023228197A1 (fr)

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IN202211029828 2022-05-24
IN202211029828 2022-05-24

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040213967A1 (en) * 2003-04-22 2004-10-28 Herbert Peiffer Coextruded, heatsealable and peelable polyester film, process for its production and its use
WO2009032627A2 (fr) * 2007-08-30 2009-03-12 Dupont Teijin Films U.S. Limited Partership Emballage pour aliment double allant au four doté d'un couvercle en film de polyester thermoformable

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040213967A1 (en) * 2003-04-22 2004-10-28 Herbert Peiffer Coextruded, heatsealable and peelable polyester film, process for its production and its use
WO2009032627A2 (fr) * 2007-08-30 2009-03-12 Dupont Teijin Films U.S. Limited Partership Emballage pour aliment double allant au four doté d'un couvercle en film de polyester thermoformable

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