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WO2021111212A1 - Matériau d'emballage recyclable à base de polyéthylène destiné à être utilisé dans un emballage atmosphérique modifié pour sacs sur rouleau et sacs faits de sachets - Google Patents

Matériau d'emballage recyclable à base de polyéthylène destiné à être utilisé dans un emballage atmosphérique modifié pour sacs sur rouleau et sacs faits de sachets Download PDF

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Publication number
WO2021111212A1
WO2021111212A1 PCT/IB2020/060505 IB2020060505W WO2021111212A1 WO 2021111212 A1 WO2021111212 A1 WO 2021111212A1 IB 2020060505 W IB2020060505 W IB 2020060505W WO 2021111212 A1 WO2021111212 A1 WO 2021111212A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyethylene
blown film
density
layer
mfi
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/IB2020/060505
Other languages
English (en)
Inventor
Dieter KREISSEL
George Francis LAHOUD
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.)
Diedloff Manley
Original Assignee
Diedloff Manley
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 Diedloff Manley filed Critical Diedloff Manley
Publication of WO2021111212A1 publication Critical patent/WO2021111212A1/fr
Priority to ZA2022/05918A priority Critical patent/ZA202205918B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B32B27/06—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
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • B32B7/02—Physical, chemical or physicochemical 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
    • 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
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • 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
    • B32B2307/75—Printability
    • 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
    • B32B2439/70—Food packaging

Definitions

  • This invention relates to a recyclable polyethylene-based packaging material for the packaging of prepared and fresh foods.
  • MAP Modified Atmosphere Packaging
  • MAP plastic packaging for the Products allow customers to visually inspect the Products without opening their packaging. This improves the presentation, preservation and/or integrity of the Products and create customer confidence that they are purchasing products of a reliable quality.
  • the process of packaging the Products is done on hand filling lines and machine fed vertical filling processes. The latter are machines that in a single process form the final packaging from the input packaging material provided in reel form, fill it with fresh or prepared foods, and then seal it closed.
  • BOPP biaxially-oriented polypropylene
  • OPP Oriented Polypropylene
  • MFI - means the ‘melt flow index’ of a polymer, which is a measure of the amount of a polymer that flows through a die in 10 minutes measured at a temperature of 190°C and a weight of 2.16kg, and it is measured in g/10min;
  • Slip Additive - means fatty acid amides (Oleamide, Erucamide and Stearamide) normally used during processing of the polymer and they are solubilized in the amorphous melt, and as the polymer cools and crystallizes the fatty acid amides migrates out to the polymer surface and lubricates the outer layer of the film thus changing the coefficient of friction. Slip additives reduce friction and allow ease of polymer handling in processes; • Processing Aid - means fluoro-elastomers designed to improve the melt processability and handling of high molecular weight polymers.
  • the fluoro-elastomer has an affinity for the metal surface of the screw and barrel and die of an extruder and therefore coats the surface of the metal providing a non-stick metal surface for the flow of molten polymer.
  • Their functions are therefore: elimination of melt fracture, improvement of film transparency and clarity, improvement of smoothness and surface aspect, improvement of product appearance, improvement of mechanical properties and the reduction of gels; and
  • Clarifying agent - means a substance that solubilizes in the molten polypropylene and precipitates from the melt upon cooling, to form a fibrous network whose surface becomes the nucleation site for the polypropylene. This surface creates a very high nucleation density, forming tiny crystallites that are too small to scatter light. The fibres themselves are also too small to scatter light, and by reducing the spherulite size the clarity of the polypropylene is increased.
  • a polyethylene-based blown film comprising three co-extruded layers, being:
  • the core layer • for the core layer to be comprised of a polyethylene resin composite and for it in thickness to measure about 50% of the total thickness of the co-extruded 3-layer polyethylene-based blown film;
  • the inner seal layer to be comprised of a polyethylene resin composite and for it in thickness to measure about 25% of the total thickness of the co-extruded 3-layer polyethylene-based blown film; and • for the outer layer to be comprised of a polyethylene resin composite and for it in thickness to measure about 25% of the total thickness of the co-extruded 3-layer polyethylene-based blown film.
  • the invention further provides for the core layer to preferably comprise, about:
  • the invention further provides for the inner seal layer to preferably comprise, about:
  • the invention further provides for the outer layer to preferably comprise, about:
  • 20% LDPE - being any commercially available low-density polyethylene resin with an MFI of 2g/10min and a density of 922kg/m 3 ;
  • the outer layer to be corona treated to a 38 dyne/cm level to allow for the adhesion of the printing inks and coatings on the outer layer in downstream processes.
  • a customer’s chosen design to be printable on the outer layer there is still further provided for a customer’s chosen design to be printable on the outer layer.
  • a method of manufacturing a clear recyclable packaging film for use on MAP machines using the 3-layer co-extruded polyethylene-based blown film as defined above including the steps of:
  • BOPP and OPP packaged Products are either hand-filled or produced using form-fill-seal equipment that has specifically been developed for the processing of BOPP and OPP substrate-based input packaging materials.
  • BOPP is an acronym biaxially oriented polypropylene and OPP is an acronym for oriented polypropylene.
  • a thick polypropylene (“PP”) sheet is produced by a blown tubular extrusion process, and the thick PP sheet is then heated to its softening point and stretched by up to 300%-400% into either two directions (bi-axially- orientated) or one direction (orientated). This process creates the thin BOPP or OPP film.
  • BOPP and OPP plastics materials have material processing temperatures in the region of around 200°C-220°C, and melting points of about 160°C.
  • the pouch machines for single bags as well as the vertical form fill and seal machines designed to specifically handle and process BOPP or OPP packaging materials are not suitable for processing a material substrate such at polyethylene which has a much narrower window for sealing in terms of temperature as well as very high levels of stretch/elongation when compared to BOPP and OPP substrates.
  • Polyethylene inherently has a much lower softening point and much lower yield tensile strength than BOPP or OPP.
  • Polyethylene has a melting point in the region of around 105 to 115 °C and a softening point typically in the range of about 85°C.
  • BOPP and OPP plastics materials have melting points in the region of around 160°C to 165°C, and a softening point of about 150°C.
  • This invention has overcome these traditional limitations of polyethylene film and allows for the polyethylene film developed to be used on these vertical form-fill-seal machines.
  • polyethylene films used on these machines for the reasons described above - would soften or melt or become deformed or torn and cause issues with registration and/or result in obstructions in the production line causing the line to fail, thus preventing further form-fill-seal activities from taking place.
  • the resulting properties of the film created in accordance with this invention - softening point and elongation - means that the polyethylene film created in accordance with the invention does not melt or become deformed in these pouch making and vertical form-fill-seal machines, and the form-fill-seal process can therefore continue without interruption and within the correct registration.
  • the applicant has therefore succeeded in creating as an invention a 3-layer co-extruded polyethylene-based packaging material, resulting in a material that is fully and widely recyclable, and which is processable on existing pouch making and vertical form-fill-seal machines designed to process only BOPP and OPP input packaging materials.
  • the advantage of this is that producers and marketers of the Products can now switch to the new 3-layer co extruded polyethylene-based input packaging material with only minor operating temperature adjustments (which adjustments are still well within the normal operating parameters of these vertical form-fill-seal machines) on their existing vertical form-fill-seal machines, which enables them to manufacture and use fully recyclable input packaging material that meet the quality and performance requirements of the traditional BOPP and OPP alternatives. No re-investment in new equipment or expensive modifications of existing equipment is accordingly required.
  • the fully recyclable co-extruded 3-layer polyethylene-based blown film comprises of three co extruded layers, being:
  • the core layer is comprised of a polyethylene resin composite and in thickness measures about 50% of the total thickness of the co-extruded 3-layer polyethylene-based blown film.
  • the core layer comprises, in its preferred embodiment about:
  • MDPE a commercially available medium-density polyethylene resin with an MFI of about 0.9g/10min and a density of about 940kg/m 3 );
  • hPP a commercially available homo-polypropylene resin with an MFI of about 2g/10min
  • the inner seal layer is comprised of a polyethylene resin composite and in thickness measures about 25% of the total thickness of the co-extruded 3-layer polyethylene-based blown film.
  • the inner seal layer comprises, in its preferred embodiment about:
  • mLLDPE a commercially available metallocene linear low-density polyethylene resin with an MFI of about 1.0g/10min and a density of about 918kg/m 3 );
  • LDPE low-density polyethylene resin with an MFI of about 0,75g/10min and a density of about 922kg/m 3 );
  • the outer layer is comprised of a polyethylene resin composite and in thickness to measure about 25% of the total thickness of the co-extruded 3-layer polyethylene-based blown film.
  • the outer layer comprises, in its preferred embodiment about:
  • mLLDPE a commercially available metallocene linear low-density polyethylene resin with an MFI of about 1.0g/10min and a density of about 918kg/m 3 );
  • LDPE low-density polyethylene resin with an MFI of about 2g/10min and a density of about 922kg/m 3 );
  • the outer later is facing outward and is corona treated to a 38 dyne/cm level to allow for the adhesion of the print.
  • the corona treating process involves corona treating across the entire width of the co-extruded 3-layer polyethylene-based blown film, leaving 20mm untreated from both edges of the co-extruded 3-layer polyethylene-based blown film. This allows for the inner and outer layer to seal in the pouch making and vertical form fill and seal process.
  • the co-extruded 3-layer polyethylene-based blown film may be produced in any suitable thickness.
  • suitable thickness For the purpose of pouch making and vertical form-fill-seal packaging it would typically be produced in a thickness range of about 30 to 50 micron.
  • the extrusion temperature profile of the three layers are:
  • Extruder C inner seal layer: hopper 175°C to screw end 210°C, Screen changer 210°C;
  • Extruder B core layer: hopper 200°C to screw end 230°C, Screen changer 230°C;
  • Extruder A (outer layer): hopper 175°C to screw end 210°C, Screen changer 210°C; and
  • the die cool ring is operated at about 6°C.
  • the co-extruded 3-layer polyethylene-based film has an effective material processing temperature melting point of around 195°C and a softening point in the range of about 80°C to Once the co-extruded 3-layer polyethylene-based film has been produced on a 3-layer blown film extrusion line, the customer’s chosen design is printed onto the outer layer.
  • the applicant is able to produce a printed co-extruded 3-layer polyethylene-based film, manufactured using existing equipment, which is fully and widely recyclable and which can be used by producers and marketers of the Products on pouch making and vertical form-fill-seal machines, designed specifically to process BOPP and OPP substrates, without any production issues or having to re-invest in new equipment or incur expensive modifications of existing equipment.
  • the heat sealing of the co-extruded 3-layer polyethylene-based film on the pouch making and vertical form-fill-seal machines no longer presents a problem since the invention results in the inner seal layer on the one side and the outer layer on the other side having higher melting points.
  • the inner seal layer then forms the seal, while the inner and outer layer neither deforms nor melts.
  • the corona treated portion of the film allows a weld on the inner and outer layer of the film without deformation.
  • the inner layer melts between the two protective outer layers.
  • the relative thicknesses of the layers comprising the co-extruded film may also be adjusted, depending on the exact choice of input components and the exact required characteristics of the required co-extruded polyethylene-based blown film (for example the specific setup of a BOPP or OPP machine).
  • the percentages of the various components to the composites forming each of the three layers may also be varied, within reason, to achieve the same or similar technical results for each layer and the film in its entirety.
  • the relative ratios of the thicknesses of the three components of the film may also similarly be varied.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un film soufflé à base de polyéthylène destiné à être utilisé dans des machines MAP et comprenant trois couches coextrudées, comprenant une couche principale, une couche d'étanchéité interne sur un côté de la couche principale, et une couche externe sur l'autre côté de la couche principale. L'invention concerne également un procédé de fabrication d'un film d'emballage recyclable transparent destiné à être utilisé sur des machines de formations-remplissage-scellage à l'horizontale utilisant le film soufflé à base de polyéthylène.
PCT/IB2020/060505 2019-12-02 2020-11-09 Matériau d'emballage recyclable à base de polyéthylène destiné à être utilisé dans un emballage atmosphérique modifié pour sacs sur rouleau et sacs faits de sachets Ceased WO2021111212A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2022/05918A ZA202205918B (en) 2019-12-02 2022-05-27 Recyclable polyethylene based packaging material for use in modified atmospheric packaging for both bags-on-roll and pouch made bags

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201907992 2019-12-02
ZA2019/07992 2019-12-02

Publications (1)

Publication Number Publication Date
WO2021111212A1 true WO2021111212A1 (fr) 2021-06-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2020/060505 Ceased WO2021111212A1 (fr) 2019-12-02 2020-11-09 Matériau d'emballage recyclable à base de polyéthylène destiné à être utilisé dans un emballage atmosphérique modifié pour sacs sur rouleau et sacs faits de sachets

Country Status (2)

Country Link
WO (1) WO2021111212A1 (fr)
ZA (1) ZA202205918B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119526859A (zh) * 2024-10-15 2025-02-28 永新股份（黄山）包装有限公司 一种拟绵纸环保可回收复合膜及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110045265A1 (en) * 2009-08-20 2011-02-24 Haley Jeffrey C Polyolefin composition and film thereof
CN110229416A (zh) * 2019-06-21 2019-09-13 广州惠豪包装新材料有限公司 一种高强度抗紫外缓冲气垫聚乙烯薄膜及其制备方法
CN110587886A (zh) * 2019-10-11 2019-12-20 佛山市联塑万嘉科技有限公司 一种复合流延淋膜及其制备方法
CN111572148A (zh) * 2020-05-07 2020-08-25 合肥佛斯德新材料科技有限公司 适用于双面印刷的bopp/pe薄膜及其加工方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110045265A1 (en) * 2009-08-20 2011-02-24 Haley Jeffrey C Polyolefin composition and film thereof
CN110229416A (zh) * 2019-06-21 2019-09-13 广州惠豪包装新材料有限公司 一种高强度抗紫外缓冲气垫聚乙烯薄膜及其制备方法
CN110587886A (zh) * 2019-10-11 2019-12-20 佛山市联塑万嘉科技有限公司 一种复合流延淋膜及其制备方法
CN111572148A (zh) * 2020-05-07 2020-08-25 合肥佛斯德新材料科技有限公司 适用于双面印刷的bopp/pe薄膜及其加工方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119526859A (zh) * 2024-10-15 2025-02-28 永新股份（黄山）包装有限公司 一种拟绵纸环保可回收复合膜及其制备方法

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