WO2010004504A2 - Feuille de polymère - Google Patents

Feuille de polymère Download PDF

Info

Publication number
WO2010004504A2
WO2010004504A2 PCT/IB2009/052937 IB2009052937W WO2010004504A2 WO 2010004504 A2 WO2010004504 A2 WO 2010004504A2 IB 2009052937 W IB2009052937 W IB 2009052937W WO 2010004504 A2 WO2010004504 A2 WO 2010004504A2
Authority
WO
WIPO (PCT)
Prior art keywords
polymer sheet
heat
layer
polymer
polyamide
Prior art date
Application number
PCT/IB2009/052937
Other languages
English (en)
Other versions
WO2010004504A3 (fr
Inventor
Amnon Slutski
Sagi Slutski
Haim Weiss
Original Assignee
Plastart Ltd.
Resht-O-Plast 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 Plastart Ltd., Resht-O-Plast Ltd filed Critical Plastart Ltd.
Publication of WO2010004504A2 publication Critical patent/WO2010004504A2/fr
Publication of WO2010004504A3 publication Critical patent/WO2010004504A3/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
    • B32B27/32—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
    • B32B27/06—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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2307/724—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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—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
    • 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

  • the present invention generally relates to the field of polymer sheets, particularly such sheets applicable for producing peelable container lids, flow-packs, bags and the like.
  • US 5,318,818 (to Sjostrom), which is incorporated herein by reference in its entirety, discloses a strip of material for the manufacture of packaging containers which have an opening device including a pull tab.
  • the strip of material comprises: a first side surface and a second side surface and a longitudinal edge.
  • the edge has one or more cut-outs formed therein and the cut-outs are in the form of a cut extending inwardly from a line defined by the edge of the strip of material.
  • a pull tab is attached to the strip of material, the pull tab extending mainly transversely over a part of the first side surface of the strip of material, around the edge of the strip of material in one of the cut-outs, and mainly transversely over a part of the second side surface of the strip of material.
  • a fold area of the pull tab is formed where the pull tab extends around the edge of the strip of material in one of the cut-outs, wherein the cut-outs are of sufficient depth that the fold area of the pull tab is disposed completely on one side of the line defined by the edge of the strip of material.
  • WO2006/097927 discloses a method for manufacturing substantially moisture resistant closures for flexible packages.
  • the method comprises providing a roll of material, printing a design on the roll, heating the roll, forming a three-dimensional shape in the roll substantially proximate to the design and cutting the roll substantially proximate to the three-dimensional shape and the design.
  • the present invention relates to a polymer sheet for use as a barrier for the protection of a food item or other suitable application.
  • the polymer sheet is particularly applicable for use as a heat-sealable peelable container lid, a flow-pack or a bag.
  • the present invention also relates to a method of producing such a polymer sheet.
  • a polymer sheet comprising a lower heat-sealing layer; a middle layer comprising a polymer support and binding layer; and an upper heat resistant layer comprising at least one polyamide.
  • the polymer sheet is produced in a single extrusion process.
  • a polymer sheet for producing heat-sealable peelable product lid, flow -pack or bag the polymer sheet prepared by a process comprising extruding simultaneously at least one heat-sealing polymer layer; a middle support layer; and an upper layer comprising at least one polyamide.
  • a food package comprising a heat-sealable peelable lid, wherein the lid comprises an upper layer comprising at least one polyamide.
  • FIG. 1 is a perspective view illustration of a container with a lid, according to some embodiments of the present invention
  • FIG. 2 is a cross section illustration of a container with a lid, according to some embodiments of the invention.
  • FIG. 3 is an illustration of a polymer sheet for producing heat-sealed peelable product lids, according to some embodiments of the invention.
  • FIG. 4 is a cross section illustration of an edge of a food product storage package having a heat-sealed peelable lid, according to some embodiments of the invention.
  • FIG. 5 is an cross section illustration of a die of a cast extruder for extruding a polymer sheet for producing heat-sealed peelable product lids, according to some embodiments of the invention.
  • FIG. 6 is flowchart of a method for producing a polymer sheet, according to some embodiments of the invention.
  • FIGS 1 and 2 illustrate a container 130 with a lid 150, according to some embodiments of the invention.
  • the container 130 may be a food container, and may be made e.g. of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), as well as aluminum, paper, and the like.
  • the lid 150 seals the container 130 and may be air tight or arranged to selectively allow gas passage therethrough.
  • the lid 150 may seal the container 130 such as to allow vacuum packaging.
  • FIG. 3 is an illustration of a polymer sheet 140 for producing heat-sealed peelable product lids, according to some embodiments of the invention.
  • the polymer sheet 140 comprises a lower heat-sealing layer 120, a polymer support layer 110, and an upper heat resistant layer 100 comprising a polyamide.
  • the polymer sheet 140 is produced in a single extrusion process.
  • lower heat-sealing layer 120 allows heat sealing to a variety of container materials such as plastics, e.g. polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), as well as aluminum, paper etc.
  • Lower heat-sealing layer 120 typically comprises one or more polyolefins and additives, and may comprise at least one of: LDPE, a polypropylene random copolymer, an anti-block master-batch, a polyolefin elastomer, a terpolymer, a copolymer of olefins or a combination thereof.
  • polymer support layer 110 comprises polypropylene and additives for strengthening the sheet 140 and binding lower heat-sealing layer 120 to upper heat resistant layer 100.
  • middle layer 110 may comprise polypropylene such as Adstif HA612M, a crystallizer such as NU 2753HP, and an adhesive such as Admer QF551E.
  • upper heat resistant layer 100 comprises one or more polyamides (e.g. Ultramid B36LN) and allows handling with current production machines and processes.
  • polyamides e.g. Ultramid B36LN
  • Using a polyamide(s) as an upper layer results in a sheet that may be cut and processed, is heat resistant, does not melt or stick during processing, yet is easily stretchable and printable, and obviates lamination.
  • upper heat resistant layer 100 comprising one or more polyamides, is as heat resistant as presently used upper layers, yet obviates the use of presently used solvents, is printable and has superior gas barrier properties.
  • FIG. 4 is a cross sectional illustration of the edge of a storage package for food products with a heat-sealed peelable lid 150, according to some embodiments of the invention.
  • the storage package comprises a container 130 for food products and a heat-sealed peelable lid 150.
  • the lid 150 comprises a lower heat-sealing layer 120, a middle layer comprising a polymer support layer 110, and an upper heat resistant layer 100 comprising polyamides such as Nylon.
  • the container 130 may comprise a sheet made of polymer sheet 140.
  • Polymer support layer 110 may comprise polymeric glue for attaching lower heat-sealing layer 120 to upper heat resistant layer 100.
  • Polymer support layer 110 may further comprise compositions for improving the processing of the polymer materials and the production process.
  • FIG. 5 is a cross sectional illustration of a die of a cast extruder for extruding a polymer sheet 160 for producing heat-sealed peelable product lids, according to some embodiments of the invention.
  • the die comprises an injector 250 and blades 260 enabling the connection of a feed pipe for each polymer resin that is fed into the die.
  • Polymer resins 200, 210, 220 are fed in a molten state into the die.
  • Upon passing the blades 260 they are combined in a front cavity 240 and then extruded as a three layered sheet 160.
  • the three layers correspond to the polymer resins fed into the die, i.e.
  • the upper polymer resin 200 may be or comprise a heat resistant resin, while the lower polymer resin 220 may be heat sealing.
  • the middle polymer resin 210 may enable connecting the upper polymer resin 200 to the lower polymer resin 220.
  • Fig. 6 is flowchart of an embodiment of a method for producing a polymer sheet, according to some embodiments of the invention.
  • the method comprises the steps of: mixing a polymer support composition (step 300); extruding simultaneously: a lower heat-sealing layer, a middle layer comprising at least one polymer support layer , and an upper layer comprising at least one polyamide, e.g. nylon (step 310).
  • the method typically further comprises: creating and storing the polymer sheet (step 320); and cutting and using lids from the polymer sheet (step 330).
  • the present polymer sheet enables a more efficient production as it is produced in one step.
  • avoiding the lamination stage commonly used in the present technologies solves the traditional problems of delamination and curling.
  • the present polymer sheet has a high mechanical strength, withstands high temperatures, is printable (externally) and has superior gas barrier characteristics than typically used polyethylene or polypropylene sheets.
  • the method avoids using solvents and gluing materials to attach sheets or layers that are produced in different (separate) processes, and thus reduces health risks and environmental damage.
  • an embodiment is an example or implementation of the inventions.
  • the various appearances of 'one embodiment,' 'an embodiment' or 'some em- bodiments' do not necessarily all refer to the same embodiments.
  • various features of the invention may be included in a single embodiment, the features may also be provided separately or in any suitable combination.
  • the invention may also be implemented in a single embodiment.
  • Reference in the specification to 'some embodiments', 'an embodiment', 'one embodiment' or 'other embodiments' means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments, of the inventions.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Cette invention concerne une feuille de polymère servant à produire un opercule pelable thermocollé, sac ou sachet thermo-soudé ; et un procédé de production associé. La feuille de polymère comprend une couche inférieure thermocollable comprenant des polyoléfines et des additifs, une couche intermédiaire comprenant une couche support polymère et une couche supérieure thermorésistante comprenant un polyamide. La feuille de polymère est produite lors d’un procédé d’extrusion simple, extrudant simultanément au moins une couche polymère thermocollable et au moins un polyamide.
PCT/IB2009/052937 2008-07-10 2009-07-06 Feuille de polymère WO2010004504A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7950708P 2008-07-10 2008-07-10
US61/079,507 2008-07-10

Publications (2)

Publication Number Publication Date
WO2010004504A2 true WO2010004504A2 (fr) 2010-01-14
WO2010004504A3 WO2010004504A3 (fr) 2010-04-01

Family

ID=41507507

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/052937 WO2010004504A2 (fr) 2008-07-10 2009-07-06 Feuille de polymère

Country Status (1)

Country Link
WO (1) WO2010004504A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318818A (en) 1992-03-03 1994-06-07 Tetra Laval Holdings & Finance S.A. Strip of material
WO2006097927A2 (fr) 2005-03-15 2006-09-21 Blajwis Ze Ev Procede de refermeture pour des contenants

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791915A (en) * 1971-07-06 1974-02-12 American Can Co Multilayer laminated polyethylene copolymer-polyamide film
US4233367A (en) * 1977-01-06 1980-11-11 American Can Company Coextruded multilayer film
US4687688A (en) * 1986-02-18 1987-08-18 American Can Company Oriented multiple layer films and bags made therefrom
US4870134A (en) * 1987-05-27 1989-09-26 Shell Oil Company Film, sheet and laminate capable of forming easy-open packagings
EP0322189A3 (fr) * 1987-12-23 1990-08-29 American National Can Company Feuilles multicouches et matériel d'emballage fabriqué à partir de celles-ci
US6291041B1 (en) * 1999-05-10 2001-09-18 Curwood, Inc. Heat resistant nylon multi-layer film
GB2360038A (en) * 2000-03-08 2001-09-12 Rexam Med Packaging Ltd Heat sealable polymeric films
US6893672B2 (en) * 2001-09-07 2005-05-17 Pechiney Emballage Flexible Europe Peelable film and packaging made therefrom
US6896956B2 (en) * 2002-12-13 2005-05-24 Exxonmobil Oil Corporation Sealable and peelable film structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318818A (en) 1992-03-03 1994-06-07 Tetra Laval Holdings & Finance S.A. Strip of material
WO2006097927A2 (fr) 2005-03-15 2006-09-21 Blajwis Ze Ev Procede de refermeture pour des contenants

Also Published As

Publication number Publication date
WO2010004504A3 (fr) 2010-04-01

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