GB2177974A - Multi-layer packaging material for RF sealing - Google Patents

Multi-layer packaging material for RF sealing Download PDF

Info

Publication number
GB2177974A
GB2177974A GB08617745A GB8617745A GB2177974A GB 2177974 A GB2177974 A GB 2177974A GB 08617745 A GB08617745 A GB 08617745A GB 8617745 A GB8617745 A GB 8617745A GB 2177974 A GB2177974 A GB 2177974A
Authority
GB
United Kingdom
Prior art keywords
eva
vinyl acetate
packaging material
acetate content
layer
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.)
Withdrawn
Application number
GB08617745A
Other versions
GB8617745D0 (en
Inventor
Alexandra Mary Rich
Terence Edwin George Wilmott
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.)
DRG UK Ltd
Original Assignee
DRG UK 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 DRG UK Ltd filed Critical DRG UK Ltd
Publication of GB8617745D0 publication Critical patent/GB8617745D0/en
Publication of GB2177974A publication Critical patent/GB2177974A/en
Withdrawn legal-status Critical Current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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • 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
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0006—Dielectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • 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
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

A packaging material laminate has an inner layer of RF energy absorbent material, e.g. an EVA containing more than 15%, preferably 18-28%, of vinyl acetate, a first outer layer of heat-sealable material substantially less absorbent of RF energy e.g. EVA containing less than 15%, preferably 4 to 9%, of vinyl acetate, and a second outer layer also of substantially less RF absorbent material and preferably of higher-melting material, e.g. high density polyethylene. Thus portions of the material can be superimposed with the polyethylene layers outermost, and clamped between RF welding jaws. Irradiation heats the intermediate layers, which heat the adjacent EVA outer layers, which are urged to seal together to form a package. The polyethylene does not melt, and so is readily separable from the jaws. The package interior is of EVA with only a low content of vinyl acetate, which will neither affect nor be affected by the package contents.

Description

SPECIFICATION Multi-layer packaging material for RF sealing This invention relates to packaging materials, and more particularly to materials which are sealable by radio frequency impulse.
Radio frequency (RF), also known as high frequency (HF), sealing is a well-established method of welding materials, especially plastics. However, it can only be used to certain materials which when placed in a RF field absorb energy and become hot. This energy absorption is measured by the loss factor, which is the product of the dielectric constant and the dissipation factor.
The main material used for RF sealing is plasticised polyvinyl chloride (PVC). However, for food and medical packaging PVC has certain disadvantages. A plasticiser is necessary, to make the material flexible and aid sealability, and this can migrate into the pack contents during storage.
Also, under cold conditions common to storing such materials, PVC packs lose some flexibility, and are less able to withstand impact, resulting in an undesirably high proportion of pack breakages in transit and distribution.
Polyethylene is a material very commonly used in packaging, especially in the food industry, but it is almost unaffected by RF.
Ethylene vinyl acetate copolymer (EVA) exhibits high RF energy absorption, according to its vinyl acetate content. A vinyl acetate content of 15% or higher is generally recognised as being necessary for RF welding. EVA has been used in packaging, and has certain useful properties; these include easier heat sealing and high impact resistance under cold conditions. However, with a high vinyl acetate content it is a rather rubbery substance with a clinging surface, and does not have good moisture vapour barrier properties, nor is it easily printable.
According to the present invention there is provided a packaging material which is a laminate having an inner layer of RF energy absorbent material, an outer layer on one side of a heat-sealable material but which is substantially less absorbent of RF energy, and an outer layer on the other side which is also of substantially less RF absorbent material. Preferably the inner layer is substantially thicker than the heat-sealing layer. The other outer layer may also be substantially thinner than the inner RF absorbent layer.
A preferred material for the inner layer is EVA, which preferably has a vinyl acetate content of at least 15%, typically 18 - 28%. The heat-sealing layer is preferably also of EVA, but with a vinyl acetate content of less than 15%, typically 4 - 9%.
Other heat sealable layers may comprise polyethylene or an ethylene copolymer. The other outer layer is preferably of a material which has a higher melting temperature than EVA, suitably high-density polyethylene (HDPE).
The laminate is preferably made by co-extrusion, but it could be made by other methods, such as lamination of separate plies, or coating.
Example A pack for containing liquid enteral feed is conventionally made of plasticised PVC. The enteral feed often contains oily products and the oily materials in the feed tend to absorb plasticiser from the PVC. To prolong the shelf life of the feed the packs are stored at reduced temperatures typically between 1 - 5 and PVC loses some impact strength at these storage temperatures. Further more, empty packs are sterilised by gamma irradiation before being filled aseptically. The irradiation slightly impairs the properties of PVC.
In accordance with the present invention a pack for enteral feed is made from a co-extruded laminate, comprising an inner layer of EVA having a vinyl acetate content of 18 - 28% and a thickness of between 50 and 250 micrometres, an outer layer of EVA having a vinyl acetate content of 4 - 9% and a thickness of 5 - 50 micrometres, and on the other side an outer layer of HDPE also of 5 - 50 micrometres thickness. The pack is formed by RF welding of superimposed layers of this laminate, with the low vinyl acetate content EVA outer layers in contact with each other between the RF sealing jaws, the jaws therefore contacting the HDPE outer layers. The RF output causes the high vinyl acetate content EVA inner layer to heat until it melts the contacting EVA outer layers causing them to weld together.The selected temperature is insufficient to melt the HDPE outer layer, or at any rate to cause it to become discontinuous, and the HDPE readily separates from the RF sealing jaws at the end of the dwell (in contrast with EVA, which would tend to adhere to the jaws).
The resulting pack has various useful properties.
When sterilised by gamma irradiation, this actually tends to strengthen the EVA by causing cross-linking. The interior of the pack has a surface of low vinyl acetate content EVA in contact with the enteral feed, and this is acceptable for storage purposes, whereas the higher vinyl acetate content inner layer material would normally be more affected by fats and oils and therefore not desirable for contact with foodstuffs. Also the layers would tend to block making packaging of the product difficult. On the other hand, the high vinyl acetate content inner layer not only provides the RF heating for the EVA outer layer, but also, being of substantial thickness, provides good strength and impact resistance. The HDPE outer layer, on the other hand, not only readily detaches from the RF sealing jaws, but also it has suitable surface properties, in particular it resists blocking when the laminate material is handled, especially in reel form; it has high moisture-vapour barrier properties; it can be loaded with a filler material for resistance to the transmission of light; and after electric discharge treatment it presents a printable surface.
1. A packaging material which is a laminate having an inner layer of RF energy absorbent ma
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (17)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Multi-layer packaging material for RF sealing This invention relates to packaging materials, and more particularly to materials which are sealable by radio frequency impulse. Radio frequency (RF), also known as high frequency (HF), sealing is a well-established method of welding materials, especially plastics. However, it can only be used to certain materials which when placed in a RF field absorb energy and become hot. This energy absorption is measured by the loss factor, which is the product of the dielectric constant and the dissipation factor. The main material used for RF sealing is plasticised polyvinyl chloride (PVC). However, for food and medical packaging PVC has certain disadvantages. A plasticiser is necessary, to make the material flexible and aid sealability, and this can migrate into the pack contents during storage. Also, under cold conditions common to storing such materials, PVC packs lose some flexibility, and are less able to withstand impact, resulting in an undesirably high proportion of pack breakages in transit and distribution. Polyethylene is a material very commonly used in packaging, especially in the food industry, but it is almost unaffected by RF. Ethylene vinyl acetate copolymer (EVA) exhibits high RF energy absorption, according to its vinyl acetate content. A vinyl acetate content of 15% or higher is generally recognised as being necessary for RF welding. EVA has been used in packaging, and has certain useful properties; these include easier heat sealing and high impact resistance under cold conditions. However, with a high vinyl acetate content it is a rather rubbery substance with a clinging surface, and does not have good moisture vapour barrier properties, nor is it easily printable. According to the present invention there is provided a packaging material which is a laminate having an inner layer of RF energy absorbent material, an outer layer on one side of a heat-sealable material but which is substantially less absorbent of RF energy, and an outer layer on the other side which is also of substantially less RF absorbent material. Preferably the inner layer is substantially thicker than the heat-sealing layer. The other outer layer may also be substantially thinner than the inner RF absorbent layer. A preferred material for the inner layer is EVA, which preferably has a vinyl acetate content of at least 15%, typically 18 - 28%. The heat-sealing layer is preferably also of EVA, but with a vinyl acetate content of less than 15%, typically 4 - 9%. Other heat sealable layers may comprise polyethylene or an ethylene copolymer. The other outer layer is preferably of a material which has a higher melting temperature than EVA, suitably high-density polyethylene (HDPE). The laminate is preferably made by co-extrusion, but it could be made by other methods, such as lamination of separate plies, or coating. Example A pack for containing liquid enteral feed is conventionally made of plasticised PVC. The enteral feed often contains oily products and the oily materials in the feed tend to absorb plasticiser from the PVC. To prolong the shelf life of the feed the packs are stored at reduced temperatures typically between 1 - 5 and PVC loses some impact strength at these storage temperatures. Further more, empty packs are sterilised by gamma irradiation before being filled aseptically. The irradiation slightly impairs the properties of PVC. In accordance with the present invention a pack for enteral feed is made from a co-extruded laminate, comprising an inner layer of EVA having a vinyl acetate content of 18 - 28% and a thickness of between 50 and 250 micrometres, an outer layer of EVA having a vinyl acetate content of 4 - 9% and a thickness of 5 - 50 micrometres, and on the other side an outer layer of HDPE also of 5 - 50 micrometres thickness. The pack is formed by RF welding of superimposed layers of this laminate, with the low vinyl acetate content EVA outer layers in contact with each other between the RF sealing jaws, the jaws therefore contacting the HDPE outer layers. The RF output causes the high vinyl acetate content EVA inner layer to heat until it melts the contacting EVA outer layers causing them to weld together.The selected temperature is insufficient to melt the HDPE outer layer, or at any rate to cause it to become discontinuous, and the HDPE readily separates from the RF sealing jaws at the end of the dwell (in contrast with EVA, which would tend to adhere to the jaws). The resulting pack has various useful properties. When sterilised by gamma irradiation, this actually tends to strengthen the EVA by causing cross-linking. The interior of the pack has a surface of low vinyl acetate content EVA in contact with the enteral feed, and this is acceptable for storage purposes, whereas the higher vinyl acetate content inner layer material would normally be more affected by fats and oils and therefore not desirable for contact with foodstuffs. Also the layers would tend to block making packaging of the product difficult. On the other hand, the high vinyl acetate content inner layer not only provides the RF heating for the EVA outer layer, but also, being of substantial thickness, provides good strength and impact resistance.The HDPE outer layer, on the other hand, not only readily detaches from the RF sealing jaws, but also it has suitable surface properties, in particular it resists blocking when the laminate material is handled, especially in reel form; it has high moisture-vapour barrier properties; it can be loaded with a filler material for resistance to the transmission of light; and after electric discharge treatment it presents a printable surface. CLAIMS
1. A packaging material which is a laminate having an inner layer of RF energy absorbent ma terial, a first outer layer on one side of a heat-sealable material but which is substantially less absorbent of RF energy, and a second outer layer on the other side whioh is also of substantially less RF absorbent material.
2. A packaging material according to claim 1 wherein said inner layer is substantially thicker than the heat-sealable layer.
3. A packaging material according to claim 2 wherein the second outer layer is substantially thinner than the inner RF absorbent layer.
4. A packaginq material according to any preceding claim wherein the inner layer comprises EVA.
5. A packaging material according to claim 4 wherein said EVA has a vinyl acetate content of at least 15
6. A packaging material accordinq to claim 5 wherein said EVA has a vinyl acetate content of 18 to 28
7. A packaging material according to any precedinq claim wherein the heat-sealable layer oomprises EVA with a vinyl acetate content of less than 15%
8. A packaging material according to claim 7 wherein the heat-sealable layer comprises EVA with a vinyl acetate content of 4 to 90.
9. A packaging material according to claim 7 or claim 8 wherein the second outer layer is of a material which has a higher melting temperature than EVA.
10. A packaging material according to any of claims 1 to 6 wherein the heat-sealable layer comprises polyethylene or an ethylene copolymer.
11. A packaging material according to any preceding claim wherein the second outer layer comprises high density polyethylene.
12. A packaging material according to any preceding claim when produced by co-extrusion.
13. A packaging material substantially as described and exemplified herein.
14. A package comprising RF sealed packaging material according to any preceding claim.
15. A package according to claim 14 filled with a food-stuff or medical material.
16. A method of producing a package comprising providing packaging material according to any of claims 1 to 13 and subjecting it to RF sealing.
17. A method accordinq to claim 16 wherein the second outer layer of the packaging material is hiqh density polyethylene, and the method comprises superimposing two layers of the packaging material with their second outer layers outermost, and applying opposed HF welding jaws which contact the outermost layers.
GB08617745A 1985-07-23 1986-07-21 Multi-layer packaging material for RF sealing Withdrawn GB2177974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858518564A GB8518564D0 (en) 1985-07-23 1985-07-23 Multi-layer packaging material

Publications (2)

Publication Number Publication Date
GB8617745D0 GB8617745D0 (en) 1986-08-28
GB2177974A true GB2177974A (en) 1987-02-04

Family

ID=10582708

Family Applications (2)

Application Number Title Priority Date Filing Date
GB858518564A Pending GB8518564D0 (en) 1985-07-23 1985-07-23 Multi-layer packaging material
GB08617745A Withdrawn GB2177974A (en) 1985-07-23 1986-07-21 Multi-layer packaging material for RF sealing

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB858518564A Pending GB8518564D0 (en) 1985-07-23 1985-07-23 Multi-layer packaging material

Country Status (1)

Country Link
GB (2) GB8518564D0 (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198082A (en) * 1986-12-01 1988-06-08 Nissho Kk Method of welding thermoplastic resin
EP0359330A2 (en) * 1988-09-12 1990-03-21 Shell Internationale Researchmaatschappij B.V. Thermoplastic container
US4934544A (en) 1989-02-27 1990-06-19 Minnesota Mining And Manufacturing Company Z-tab innerseal for a container and method of application
US5004111A (en) 1989-02-27 1991-04-02 Minnesota Mining & Manufacturing Company Internally delaminating tabbed innerseal for a container and method of applying
US5012946A (en) 1989-02-27 1991-05-07 Minnesota Mining & Manufacturing Company Innerseal for a container and method of applying
EP0495729A2 (en) * 1991-01-17 1992-07-22 Terumo Kabushiki Kaisha Composite substrate for medical container
WO1993011926A2 (en) * 1991-12-11 1993-06-24 Baxter International Inc. Method and compositions that render materials rf responsive
US5399396A (en) * 1990-09-21 1995-03-21 Exxon Chemical Patents Inc. Multi-layer film
WO1995014739A2 (en) * 1993-11-16 1995-06-01 Baxter International Inc. Polymeric compositions for medical packaging and devices
EP0769516A2 (en) † 1995-09-16 1997-04-23 Fresenius AG Connection structure and process for connecting two single parts of a medical system
US5935847A (en) 1994-10-28 1999-08-10 Baxter International Inc. Multilayer gas-permeable container for the culture of adherent and non-adherent cells
US5976300A (en) 1996-07-03 1999-11-02 Baxter International Inc. Method of sealing a port tube in a container
US5998019A (en) 1993-11-16 1999-12-07 Baxter International Inc. Multi-layered polymer structure for medical products
US6024220A (en) 1995-06-07 2000-02-15 Baxter International Inc. Encapsulated seam for multilayer materials
US6297046B1 (en) 1994-10-28 2001-10-02 Baxter International Inc. Multilayer gas-permeable container for the culture of adherent and non-adherent cells
US6372848B1 (en) 2000-10-10 2002-04-16 Baxter International Inc. Blend of ethylene and α-olefin copolymers obtained using a metallocene catalyst for fabricating medical films and tubings
US6391404B1 (en) 1995-06-07 2002-05-21 Baxter International Inc. Coextruded multilayer film materials and containers made therefrom
US6461696B1 (en) 1993-11-16 2002-10-08 Baxter International Inc. Multi-layered polymer based moisture barrier structure for medical grade products
US6528173B1 (en) 1997-02-24 2003-03-04 Baxter International Inc. Coextruded multilayer films for sterilizable fluid containers
US6743523B1 (en) 2000-03-16 2004-06-01 Baxter International Inc. Multiple layer film of a new non-PVC material
WO2013096711A1 (en) 2011-12-21 2013-06-27 Dow Global Technologies Llc High frequency weldable polyolefin compositions including polar polymers
WO2013096705A1 (en) 2011-12-21 2013-06-27 Dow Global Technologies Llc High frequency weldable polyolefin compositions containing zeolites
EP4190858A1 (en) 2021-12-03 2023-06-07 Borealis AG High frequency weldable polyolefin composition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2018675A (en) * 1978-03-29 1979-10-24 Union Carbide Corp Multilayer film
GB2099755A (en) * 1981-05-29 1982-12-15 Grace W R & Co Thermoplastic film having improved handling and sealing characteristics and receptacle formed therefrom
GB2123747A (en) * 1982-07-09 1984-02-08 Piero Francesconi Packaging material
GB2149345A (en) * 1983-11-09 1985-06-12 Grace W R & Co Heat sterilizable laminate films

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2018675A (en) * 1978-03-29 1979-10-24 Union Carbide Corp Multilayer film
GB2099755A (en) * 1981-05-29 1982-12-15 Grace W R & Co Thermoplastic film having improved handling and sealing characteristics and receptacle formed therefrom
GB2123747A (en) * 1982-07-09 1984-02-08 Piero Francesconi Packaging material
GB2149345A (en) * 1983-11-09 1985-06-12 Grace W R & Co Heat sterilizable laminate films

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950347A (en) * 1986-01-12 1990-08-21 Nissho Corporation Method for welding thermoplastic resin
GB2198082B (en) * 1986-12-01 1990-12-12 Nissho Kk Method for the manufacture of plastic bags
GB2198082A (en) * 1986-12-01 1988-06-08 Nissho Kk Method of welding thermoplastic resin
AU628077B2 (en) * 1988-09-12 1992-09-10 Shell Internationale Research Maatschappij B.V. Thermoplastic container
EP0359330A2 (en) * 1988-09-12 1990-03-21 Shell Internationale Researchmaatschappij B.V. Thermoplastic container
EP0359330A3 (en) * 1988-09-12 1991-03-20 Shell Internationale Researchmaatschappij B.V. Thermoplastic container
US4934544A (en) 1989-02-27 1990-06-19 Minnesota Mining And Manufacturing Company Z-tab innerseal for a container and method of application
US5004111A (en) 1989-02-27 1991-04-02 Minnesota Mining & Manufacturing Company Internally delaminating tabbed innerseal for a container and method of applying
US5012946A (en) 1989-02-27 1991-05-07 Minnesota Mining & Manufacturing Company Innerseal for a container and method of applying
US5399396A (en) * 1990-09-21 1995-03-21 Exxon Chemical Patents Inc. Multi-layer film
EP0495729A2 (en) * 1991-01-17 1992-07-22 Terumo Kabushiki Kaisha Composite substrate for medical container
EP0495729A3 (en) * 1991-01-17 1992-09-02 Terumo Kabushiki Kaisha Composite substrate for medical container
WO1993011926A2 (en) * 1991-12-11 1993-06-24 Baxter International Inc. Method and compositions that render materials rf responsive
WO1993011926A3 (en) * 1991-12-11 1994-06-09 Baxter Int Method and compositions that render materials rf responsive
US5645904A (en) * 1991-12-11 1997-07-08 Baxter International Inc. Method and compositions that render materials RF responsive
US5840146A (en) * 1991-12-11 1998-11-24 Baxter International Inc. Method and compositions that render materials RF responsive
US5849843A (en) 1993-11-16 1998-12-15 Baxter International Inc. Polymeric compositions for medical packaging and devices
US5998019A (en) 1993-11-16 1999-12-07 Baxter International Inc. Multi-layered polymer structure for medical products
US5686527A (en) 1993-11-16 1997-11-11 Baxter International Inc. Polymeric compositions for medical packaging and devices
WO1995014739A3 (en) * 1993-11-16 1995-08-24 Baxter Int Polymeric compositions for medical packaging and devices
WO1995014739A2 (en) * 1993-11-16 1995-06-01 Baxter International Inc. Polymeric compositions for medical packaging and devices
US5854347A (en) 1993-11-16 1998-12-29 Baxter International Inc. Polymeric compositions for medical packaging and devices
US6399704B1 (en) 1993-11-16 2002-06-04 Baxter International Inc. Polymeric compositions for medical packaging and devices
US6461696B1 (en) 1993-11-16 2002-10-08 Baxter International Inc. Multi-layered polymer based moisture barrier structure for medical grade products
US6297046B1 (en) 1994-10-28 2001-10-02 Baxter International Inc. Multilayer gas-permeable container for the culture of adherent and non-adherent cells
US5935847A (en) 1994-10-28 1999-08-10 Baxter International Inc. Multilayer gas-permeable container for the culture of adherent and non-adherent cells
US6024220A (en) 1995-06-07 2000-02-15 Baxter International Inc. Encapsulated seam for multilayer materials
US6391404B1 (en) 1995-06-07 2002-05-21 Baxter International Inc. Coextruded multilayer film materials and containers made therefrom
EP0769516A2 (en) † 1995-09-16 1997-04-23 Fresenius AG Connection structure and process for connecting two single parts of a medical system
EP0769516B2 (en) † 1995-09-16 2009-04-22 Fresenius AG Connection structure and process for connecting two single parts of a medical system
US5976300A (en) 1996-07-03 1999-11-02 Baxter International Inc. Method of sealing a port tube in a container
US6528173B1 (en) 1997-02-24 2003-03-04 Baxter International Inc. Coextruded multilayer films for sterilizable fluid containers
US6743523B1 (en) 2000-03-16 2004-06-01 Baxter International Inc. Multiple layer film of a new non-PVC material
US6372848B1 (en) 2000-10-10 2002-04-16 Baxter International Inc. Blend of ethylene and α-olefin copolymers obtained using a metallocene catalyst for fabricating medical films and tubings
WO2013096711A1 (en) 2011-12-21 2013-06-27 Dow Global Technologies Llc High frequency weldable polyolefin compositions including polar polymers
WO2013096705A1 (en) 2011-12-21 2013-06-27 Dow Global Technologies Llc High frequency weldable polyolefin compositions containing zeolites
US9617399B2 (en) 2011-12-21 2017-04-11 Dow Global Technologies Llc High frequency weldable polyolefin compositions containing zeolites
EP3438185A2 (en) 2011-12-21 2019-02-06 Dow Global Technologies, LLC High frequency weldable polyolefin compositions including polar polymers
EP4190858A1 (en) 2021-12-03 2023-06-07 Borealis AG High frequency weldable polyolefin composition
WO2023099323A1 (en) 2021-12-03 2023-06-08 Borealis Ag High frequency weldable polyolefin composition
EP4194500A1 (en) 2021-12-03 2023-06-14 Borealis AG High frequency weldable polyolefin composition

Also Published As

Publication number Publication date
GB8617745D0 (en) 1986-08-28
GB8518564D0 (en) 1985-08-29

Similar Documents

Publication Publication Date Title
GB2177974A (en) Multi-layer packaging material for RF sealing
US4279344A (en) Heat-sealable and peelable laminated packaging construction
KR950007617B1 (en) Heat sealable barrier material for improved juice packaging
EP0343877B1 (en) Multi-layer packaging film and process
KR950007618B1 (en) Heat sealable barrier material for improved juice packaging
EP0251770B1 (en) Multilayer film with good layer adhesion
US4355721A (en) Package for food products
KR950012792B1 (en) Improved non-foil composite structures for packing juice
CA1332051C (en) Package units for medicinal purposes
NZ205579A (en) Multi-layer,pasteurisable,cook-in shrink film
EP0258527A1 (en) Peelable film laminate
IE58785B1 (en) Readily peelable, sterilizable packs
JPH06246886A (en) Resin laminate and use application thereof
JPS59199461A (en) Packing vessel
WO2004060201A2 (en) Tampon package and method for making same
GB2048775A (en) Foodstuff Packaging Materials
US4729476A (en) Easy open shrinkable laminate
JP4366772B2 (en) Packaging for microwave oven
US5157901A (en) Method for sealing retort container
US5462756A (en) Cook-in meat package
JP3867474B2 (en) Easy-open composite film and packaging container
JPH0638831B2 (en) Medical container
JP3543456B2 (en) Easy peel seal film and container
GB2228724A (en) "packaging bags"
JP3179591B2 (en) Food packaging method

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)