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GB2319746A - Heat-sealable composite sheet materials for reclosable packages - Google Patents

Heat-sealable composite sheet materials for reclosable packages Download PDF

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Publication number
GB2319746A
GB2319746A GB9705205A GB9705205A GB2319746A GB 2319746 A GB2319746 A GB 2319746A GB 9705205 A GB9705205 A GB 9705205A GB 9705205 A GB9705205 A GB 9705205A GB 2319746 A GB2319746 A GB 2319746A
Authority
GB
United Kingdom
Prior art keywords
layer
ionomer
composite sheet
heat
sheet material
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.)
Granted
Application number
GB9705205A
Other versions
GB2319746B (en
GB9705205D0 (en
Inventor
Harold Edward Taylor
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.)
DOLPHIN PACKAGING MATERIALS
Original Assignee
DOLPHIN PACKAGING MATERIALS
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 DOLPHIN PACKAGING MATERIALS filed Critical DOLPHIN PACKAGING MATERIALS
Publication of GB9705205D0 publication Critical patent/GB9705205D0/en
Publication of GB2319746A publication Critical patent/GB2319746A/en
Application granted granted Critical
Publication of GB2319746B publication Critical patent/GB2319746B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • 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
    • B32B27/36—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
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2327/00—Polyvinylhalogenides
    • B32B2327/06—PVC, i.e. polyvinylchloride
    • 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
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • 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

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

A thermo-formable and heat-sealable composite sheet material (A) comprises a base layer (1) of poly vinyl chloride (PVC) or polyethylene terephthalate (PET), a cushion layer (2) of polyethylene (PE) and a thin film (3) of an ionomer or of an ethylene methyl acrylate co-polymer on said cushion layer, on the opposite face to that face bonded to the base layer, the ionomer or copolymer being chosen so as to be capable of being heat-sealed to an identical ionomer or copolymer layer (4) provided on the exposed surface of a flexible cover sheet (B), and at a temperature at which the PE layer is only softened to provide cushioning of the ionomer or copolymer during heat sealing. The lid may contain a layer (5) of elastomer, a layer (6) of LDPE and a layer (7) of PET or PVDC.

Description

HEAT-SEALABLE COMPOSITE SHEET MATERIALS AND RECLOSABLE PACKAGES This invention relates to heat-sealable composite sheet materials and to reclosable packages utilising such sheet materials.
The potential advantages of reclosable packages have been discussed in Patent Specifications no. US 4673602 and US Re 27361. These specifications both put forward the idea of a flexible composite sheet material which comprises a carrier film, a layer of a pressure-sensitive adhesive and a thin covering layer which can be heat-sealed to a layer of the same heat-sealable material.
In use, when the package is opened, the thin covering layer or the adhesive layer ruptures to expose the pressure sensitive adhesive such that, on reapplication of the composite sheet, a seal is effected by the adhesive.
Various proposals are made in those specifications for suitable materials for the different layers of the composite sheet material.
The present invention is particularly concerned with the problem of devising composite materials which can be thermo-formed to produce a receptacle yet which are suitable for heat sealing to a composite material which incorporates a pressure-sensitive adhesive layer.
According to one aspect of the present invention a thermo-formable and heat-sealable composite sheet material comprises a base layer of poly vinyl chloride (PVC) or polyethylene terephthalate (PET), a cushion layer of polyethylene (PE) and a thin film of an ionomer or of an ethylene methyl acrylate co-polymer on said cushion layer, on the opposite face to that face bonded to the base layer, the ionomer or copolymer being chosen so as to be capable of being heat-sealed to an identical ionomer or copolymer layer provided on the exposed surface of a flexible cover sheet, and at a temperature at which the PE layer is only softened to provide cushioning of the ionomer or copolymer during heat sealing.
When an ionomer is used, the ionomer is preferably SurlynTM sold by Dupont.
When an ethylene methyl acrylate co-polymer is used, this is preferably Lotryl, which is an EBA and EMA copolymer.
It is to be noted that although polyethylene (PE) is capable of being heatsealed itself to another layer of PE, we choose to provide an ionomer heatsealable film on top of the PE, and we use the PE to act as a cushion to maintain the integrity of the ionomer film during heat sealing. This avoids the use of a thick ionomer film which would be expensive.
We are aware that the use of an ionomer heat-sealable layer has been proposed in specification WO90/07427 as the heat seal layer, but not in conjunction with a material that is itself capable of being heat-sealed.
Preferably the flexible cover sheet for use with a thermo-formed receptacle produced from the sheet material of the first aspect of the invention comprises a base layer of polyethylene terephthalate (PET), a layer of pressure sensitive adhesive and a thin film of the ionomer.
One embodiment of the invention is shown diagrammatically, by way of example only, in the accompanying schematic cross-sectional drawing.
In the drawing A represents a portion of a thermo-formed receptacle, such as a bacon tray, and B represents a composite sheet material suitable for being heat-sealed to the peripheral flange 7 of the receptacle. Typical materials and typical material thicknesses are shown in the table:
Layer Material Thickness (Microns) 1 PVC 150-550 2 PE 25-50 3 Surlyn 5-10 4 Surlyn 5-10 5 Elastomer + tackifier 25-50 eg ATO FINDLEY INC M3062 6 LDPE 10-20 7 PET or PVDC 10-60 In the above table layer 6 is an optional coating on the PET layer 7.
Layer 6 may be LLDP (linear low density polyethylene), high density polyethylene (HDPE), medium density polyethylene (MDPE) or could be any suitable generic polyolefin.
The sheet material B can be heat-sealed to the sheet material A by clamping the materials AB between jaws, the upper jaw being heated whereby heat is conducted through layers 7, 6 and 5 to layers 4 and 3, so as to heat seal layer 3 and 4 together.
When the customer opens such a heat-sealed pack the adhesive layer 5 is exposed to provide a cohesive film thereby providing an adhesive interface to give resealability.

Claims (7)

1. A thermo-formable and heat-sealable composite sheet material comprising a base layer of poly vinyl chloride (PVC) or polyethylene terephthalate (PET), a cushion layer of polyethylene (PE) and a thin film of an ionomer or of an ethylene methyl acrylate co-polymer on said cushion layer, on the opposite face to that face bonded to the base layer, the ionomer or copolymer being chosen so as to be capable of being heatsealed to an identical ionomer or copolymer layer provided on the exposed surface of a flexible cover sheet, and at a temperature at which the PE layer is only softened to provide cushioning of the ionomer or copolymer during heat sealing.
2. A composite sheet material as claimed in claim 1 in which the base layer is of PVC.
3. A composite sheet material as claimed in claim 1 or claim 2 in which the thin film is of an ionomer, and the ionomer is SurlynfM.
4. A composite sheet material as claimed in claim 1 or claim 2 in which the thin film is a copolymer of EBA and EMA.
5. A composite sheet material substantially as described herein with reference to the table herein and accompanying drawing.
6. A reclosable package comprising a base and a flexible cover sheet heat-sealed thereto, the base having been thermo-formed from a composite sheet material as claimed in any of the preceding claims.
7. A package as claimed in claim 6 and substantially as described herein with reference to the table herein and the accompanying drawing.
GB9705205A 1996-11-23 1997-03-13 Reclosable packages Expired - Fee Related GB2319746B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9624391.0A GB9624391D0 (en) 1996-11-23 1996-11-23 Heat-sealable composite sheet materials and reclosable packages

Publications (3)

Publication Number Publication Date
GB9705205D0 GB9705205D0 (en) 1997-04-30
GB2319746A true GB2319746A (en) 1998-06-03
GB2319746B GB2319746B (en) 2000-05-31

Family

ID=10803379

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9624391.0A Pending GB9624391D0 (en) 1996-11-23 1996-11-23 Heat-sealable composite sheet materials and reclosable packages
GB9705205A Expired - Fee Related GB2319746B (en) 1996-11-23 1997-03-13 Reclosable packages

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9624391.0A Pending GB9624391D0 (en) 1996-11-23 1996-11-23 Heat-sealable composite sheet materials and reclosable packages

Country Status (1)

Country Link
GB (2) GB9624391D0 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1053952A1 (en) 1999-05-21 2000-11-22 Soplaril SA Resealable package having a tearable layer and and method of manufacturing the same
EP0868368B1 (en) * 1995-11-29 2001-01-10 Soplaril Container sealing assembly
US6511723B1 (en) 1999-05-21 2003-01-28 Soplaril, S.A. Multilayer structure able to be obtained by collapsing a co-extrusion bubble
US7622176B2 (en) 2001-02-09 2009-11-24 Bostik Sa Hot-extrudable pressure-sensitive hot-melt adhesives and their use in multilayer films
CN1760087B (en) * 2005-11-04 2010-08-11 大连富利达塑料制品有限公司 Composite packaging film including five layers being extruded out capable of obstructing liquid highly
WO2010114879A1 (en) 2009-03-31 2010-10-07 Avery Dennison Corporation Resealable laminate for heat sealed packaging
WO2011123410A1 (en) 2010-03-31 2011-10-06 Avery Dennison Corporation Resealable laminate for heat sealed packaging
WO2013015867A1 (en) 2011-07-27 2013-01-31 E. I. Du Pont De Nemours And Company Multilayer films for reclosable packaging
US9550616B2 (en) 2010-05-25 2017-01-24 Avery Dennison Corporation Tamper evident container
CN107776508A (en) * 2017-10-23 2018-03-09 无锡吉兴汽车声学部件科技有限公司 The method of the anti-abnormal sound of lower shock pad of car carpet
US10710773B2 (en) 2009-09-11 2020-07-14 Avery Dennison Corporation Resealable laminate for heat sealed packaging
US11352172B2 (en) 2009-09-11 2022-06-07 Avery Dennison Corporation Resealable laminate for heat sealed packaging

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113263813A (en) * 2021-05-31 2021-08-17 湖北舰海新兴材料股份有限公司 Combined type PE membrane

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521467A (en) * 1983-12-12 1985-06-04 Frito-Lay, Inc. Ultrasonically-sealable peelable seal
US4912103A (en) * 1988-05-05 1990-03-27 Jefferson Smurfit Corporation Water vapor barrier laminate for packaging

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521467A (en) * 1983-12-12 1985-06-04 Frito-Lay, Inc. Ultrasonically-sealable peelable seal
US4912103A (en) * 1988-05-05 1990-03-27 Jefferson Smurfit Corporation Water vapor barrier laminate for packaging

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0868368B1 (en) * 1995-11-29 2001-01-10 Soplaril Container sealing assembly
US6302290B1 (en) 1995-11-29 2001-10-16 Atofina Container sealing assembly
EP1074482B1 (en) * 1995-11-29 2003-12-17 Soplaril Sa Container sealing assembly
EP1053952A1 (en) 1999-05-21 2000-11-22 Soplaril SA Resealable package having a tearable layer and and method of manufacturing the same
US6511723B1 (en) 1999-05-21 2003-01-28 Soplaril, S.A. Multilayer structure able to be obtained by collapsing a co-extrusion bubble
US6777050B1 (en) 1999-05-21 2004-08-17 Soplaril, S.A. Resealable packaging the container of which includes a tearable welding layer, and its manufacture
US7622176B2 (en) 2001-02-09 2009-11-24 Bostik Sa Hot-extrudable pressure-sensitive hot-melt adhesives and their use in multilayer films
CN1760087B (en) * 2005-11-04 2010-08-11 大连富利达塑料制品有限公司 Composite packaging film including five layers being extruded out capable of obstructing liquid highly
WO2010114879A1 (en) 2009-03-31 2010-10-07 Avery Dennison Corporation Resealable laminate for heat sealed packaging
US8551588B2 (en) 2009-03-31 2013-10-08 Avery Dennison Corporation Resealable laminate for heat sealed packaging
US11352172B2 (en) 2009-09-11 2022-06-07 Avery Dennison Corporation Resealable laminate for heat sealed packaging
US10710773B2 (en) 2009-09-11 2020-07-14 Avery Dennison Corporation Resealable laminate for heat sealed packaging
WO2011123410A1 (en) 2010-03-31 2011-10-06 Avery Dennison Corporation Resealable laminate for heat sealed packaging
US9550616B2 (en) 2010-05-25 2017-01-24 Avery Dennison Corporation Tamper evident container
JP2014525856A (en) * 2011-07-27 2014-10-02 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー Multi-layer film for reclosable packaging
CN103648765A (en) * 2011-07-27 2014-03-19 纳幕尔杜邦公司 Multilayer films for reclosable packaging
CN103648765B (en) * 2011-07-27 2017-06-06 纳幕尔杜邦公司 For the multilayer film of reclosable packaging
US8617677B2 (en) 2011-07-27 2013-12-31 E I Du Pont De Nemours And Company Multilayer films for reclosable packaging
WO2013015867A1 (en) 2011-07-27 2013-01-31 E. I. Du Pont De Nemours And Company Multilayer films for reclosable packaging
CN107776508A (en) * 2017-10-23 2018-03-09 无锡吉兴汽车声学部件科技有限公司 The method of the anti-abnormal sound of lower shock pad of car carpet

Also Published As

Publication number Publication date
GB2319746B (en) 2000-05-31
GB9705205D0 (en) 1997-04-30
GB9624391D0 (en) 1997-01-08

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090313