WO2019224838A1 - Stratifié - Google Patents

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Publication number
WO2019224838A1
WO2019224838A1 PCT/IN2019/050400 IN2019050400W WO2019224838A1 WO 2019224838 A1 WO2019224838 A1 WO 2019224838A1 IN 2019050400 W IN2019050400 W IN 2019050400W WO 2019224838 A1 WO2019224838 A1 WO 2019224838A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
laminate
eva
oriented polyolefin
seal
Prior art date
Application number
PCT/IN2019/050400
Other languages
English (en)
Inventor
Suresh Gupta
Marzban THANEVALA
Original Assignee
Huhtamaki-Ppl Limited
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 Huhtamaki-Ppl Limited filed Critical Huhtamaki-Ppl Limited
Publication of WO2019224838A1 publication Critical patent/WO2019224838A1/fr

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
    • B32B27/18—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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B2250/02—2 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
    • 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
    • B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric 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
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/80—Medical packaging

Definitions

  • the invention relates to a laminate and process for production thereof, more particularly to a laminate for packaging applications, especially for soap wrappers and similar pack formats.
  • a challenge associated with traditional packaging is the use of hot melt adhesives as a sealant.
  • hot melt adhesives require very high temperatures (> 150 Deg C) to melt as well as maintaining these adhesives at a usable viscosity.
  • harmful and unsafe fumes are generated during such melting which has negative effects on the environment & health of the people operating these machines.
  • the polyester film and paper stiffener combination is non-recyclable due to the dissimilar characteristics of the raw material used and hence brand owners are in the need of a recyclable, sustainable, energy efficient soap wrapper laminate.
  • laminates manufactured using Oriented poly olefin based films (OPOF) were introduced.
  • These films are typically, but not limited to Biaxially oriented poly propylene (BOPP), Mono axially oriented poly propylene films (MOPP), Mono axially oriented poly ethylene films (MOPE), bi axially oriented poly ethylene (BOPE) films etc & other such films. These films are characterized by their orientation in at least 1 direction. However, these laminates were not found to be user friendly due to its propensity to curl and resistance to dead fold, sub-optimal sealing behavior and high cost economics due to the use of acrylic coating on the OPOF films.
  • the invention provides a laminate comprising
  • a first film (101) being an oriented polyolefin film having an inner surface, and an outer surface with a terpolymer or Ethylene Vinyl acetate (EVA) (103) layer thereon;
  • a second film (102) being an oriented polyolefin film having an inner surface, and an outer surface with ethyl vinyl acetate (EVA) (104) layer thereon,
  • first film and the second film being laminated along their inner surfaces to form the laminate, and outer surface of each film of the laminate capable of being sealed by a lap seal and/or a fin seal.
  • Figure 1 shows a cross sectional view of the laminate in accordance with the embodiments of the invention.
  • Figure 2 shows a seal curve representing the heat seal strength at various pressures and sealing temperatures in accordance with the embodiments of the invention.
  • the present invention is directed towards a laminate for packaging applications, especially for use as a soap wrapper and process of production thereof.
  • the invention relates to a laminate comprising
  • a first film (101) being an oriented polyolefin film having an inner surface, and an outer surface with a terpolymer or Ethylene Vinyl acetate (EVA) (103) layer thereon;
  • a second film (102) being an oriented polyolefin film having an inner surface, and an outer surface with ethyl vinyl acetate (EVA) (104) layer thereon,
  • first film and the second film being laminated along their inner surfaces to form the laminate, and outer surface of each film of the laminate is capable of being sealed by a lap seal and/or a fin seal.
  • the first and second oriented polyolefin film is a biaxially oriented polypropylene film.
  • the terpolymer layer and the EVA layer may be coextrusion coated on the outer surface of the first oriented polyolefin film.
  • the terpolymer and the EVA may be coextruded with the first and second oriented polyolefin film respectively.
  • FIG. 1 shows a laminate 100 in accordance with an embodiment of the invention.
  • the laminate comprises of a first oriented polyolefin film 101 laminated with a second film 102.
  • the first film and the second film is selected from an oriented polyolefin film family.
  • the first film and the second film is a biaxially oriented polyolefin film.
  • the laminate has an inner face B and an outer face A.
  • the outer face A has a terpolymer/ Ethyl Vinyl Acetate coating 103
  • the inner face B has an EVA coating 104.
  • the terpolymer comprises monomers selected from, but not limited to, ethylene, propylene, other olefins.
  • the face A of the laminate is capable of sealing with face A itself forming a fin seal (A/A) or with face B to form a lap seal (A/B) packaging.
  • the face B is capable of sealing with face B itself forming a fin seal (B/B) or face A (B/A) to form a lap seal packaging.
  • a packaging for enclosing soap bars can be formed with a longitudinal lap seal where opposing faces of the film are sealed along its edges i.e. face having EVA is sealed with face having terpolymer/EVA.
  • a packaging can be formed with a longitudinal fin seal where same face of the film is sealed i.e. face having EVA is sealed to face having EVA or the face having terpolymer/EVA is sealed to face having terpolymer.
  • sealing temperature of the laminate described hereinbefore falls within the sealing temperature band of the OPOF films used therein. This is achieved by using low seal initiation temperature surfaces coming in contact with each other i.e.
  • the terpolymer and EVA combination allows sealing at very low temperatures as compared to conventional soap wrappers. Such low temperature sealing enables faster machine processing/speed resulting in much greater production.
  • the laminate also has a controlled coefficient of friction that further helps in machinability of these laminates.
  • the film may be surface printed or reverse printed.
  • the first film is reverse printed by various printing techniques, namely but not limited to rotogravure, flexography, offset digital, etc.
  • the EVA layer may also formulated with the conventional slip and anti-blocking additives for smooth runability on packaging lines.
  • the invention also relates to a process for forming a laminate.
  • the process comprising the steps of providing a first oriented polyolefin film co-extruded with a terpolymer/EVA on one surface, providing a second oriented polyolefin film co-extruded with EVA on one surface, laminating the first and the second OPOF films,.
  • the terpolymer/EVA layer may be formed by extrusion of terpolymer/EVA and polylpropylene together while making BOPP film or by coextrusion coating of terpolymer/EVA on pre-made BOPP film.
  • the EVA is applied on the laminate by coextrusion on an extrusion coating machine or it can be bought as part of a BOPP film where EVA is already co extruded.
  • the laminate is used for packaging soap bars, wherein a packaging can be formed with a lap seal and/or a fin seal.
  • a heat seal can be effected between the faces of the laminate by applying heat at a temperature as low as 85°C.
  • the low temperature sealing of the terpolymer-terpolymer combination or EVA-EVA combination or terpolymer- EVA combination provides good sealabilty resulting in faster machine speed/processing leading to higher production.
  • a laminate was prepared by coextrusion coating of an Ethylene-Propylene-Alpha-olefin onto a heat sealable BOPP which was then laminated with a pearlised BOPP.
  • the pearlised BOPP surface of the laminate was then coated with EVA.
  • the Lap seal strength of said laminate was tested at varying temperatures and pressures. The results are shown in table below
  • the present invention provides a laminate, wherein the laminate has a controlled coefficient of friction which further helps in machinability of these laminates.
  • the sealing temperature of these laminates is such that it falls within the sealing temperature band of oriented polyolefin films without adversely affecting them.
  • the use of all polymers from same family (polypropylene) in the laminate makes it recyclable due to very close or similar melting points as the output multilayer laminate can be melted and processed together to make plastic granules which can be used for secondary applications like but not limited to injection molding/ compression molding.

Landscapes

  • Laminated Bodies (AREA)

Abstract

L'invention concerne un stratifié, comprenant un premier film (101) qui est un film de polyoléfine orienté présentant une surface interne, et une surface externe sur laquelle est agencée une couche de terpolymère ou d'éthylène-acétate de vinyle (EVA) (103) ; un second film (102) qui est un film de polyoléfine orienté présentant une surface interne, et une surface externe sur laquelle est agencée une couche d'éthylène-acétate de vinyle (EVA) (104), le premier film et le second film étant stratifiés le long de leurs surfaces internes en vue de former le stratifié, et la surface externe de chaque film du stratifié étant apte à être scellée par un joint à recouvrement et/ou un joint à ailette.
PCT/IN2019/050400 2018-05-19 2019-05-20 Stratifié WO2019224838A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201821014905 2018-05-19
IN201821014905 2018-05-19

Publications (1)

Publication Number Publication Date
WO2019224838A1 true WO2019224838A1 (fr) 2019-11-28

Family

ID=67060438

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2019/050400 WO2019224838A1 (fr) 2018-05-19 2019-05-20 Stratifié

Country Status (1)

Country Link
WO (1) WO2019224838A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038108A2 (fr) * 1980-01-25 1981-10-21 Mobil Oil Corporation Feuilles d'emballage thermoplastiques ayant des caractéristiques de scellement à chaud améliorées
US4421823A (en) * 1982-06-01 1983-12-20 Curwood, Inc. Flexible wrapping material and method of manufacture
US4695503A (en) * 1986-03-07 1987-09-22 Mobil Oil Corporation Coated, oriented, polymer film laminate
US20040105994A1 (en) * 2002-12-03 2004-06-03 Pang-Chia Lu Thermoplastic film structures with a low melting point outer layer
WO2012093881A2 (fr) * 2011-01-06 2012-07-12 Youl Chon Chemical Co., Ltd. Procédé de fabrication d'un film de polyoléfine orienté multicouche et film de polyoléfine orienté multicouche fabriqué grâce à ce procédé
EP2684686A1 (fr) * 2012-07-10 2014-01-15 Toray Plastics (America), Inc. Structures de film contenant un film à orientation biaxiale avec deux couches de polyoléfine extrudée

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038108A2 (fr) * 1980-01-25 1981-10-21 Mobil Oil Corporation Feuilles d'emballage thermoplastiques ayant des caractéristiques de scellement à chaud améliorées
US4421823A (en) * 1982-06-01 1983-12-20 Curwood, Inc. Flexible wrapping material and method of manufacture
US4695503A (en) * 1986-03-07 1987-09-22 Mobil Oil Corporation Coated, oriented, polymer film laminate
US20040105994A1 (en) * 2002-12-03 2004-06-03 Pang-Chia Lu Thermoplastic film structures with a low melting point outer layer
WO2012093881A2 (fr) * 2011-01-06 2012-07-12 Youl Chon Chemical Co., Ltd. Procédé de fabrication d'un film de polyoléfine orienté multicouche et film de polyoléfine orienté multicouche fabriqué grâce à ce procédé
EP2684686A1 (fr) * 2012-07-10 2014-01-15 Toray Plastics (America), Inc. Structures de film contenant un film à orientation biaxiale avec deux couches de polyoléfine extrudée

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