GB2294902A - Composite packing sheets - Google Patents

Composite packing sheets Download PDF

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Publication number
GB2294902A
GB2294902A GB9522985A GB9522985A GB2294902A GB 2294902 A GB2294902 A GB 2294902A GB 9522985 A GB9522985 A GB 9522985A GB 9522985 A GB9522985 A GB 9522985A GB 2294902 A GB2294902 A GB 2294902A
Authority
GB
United Kingdom
Prior art keywords
heat sealable
woven
sealable coating
ferrous metals
sheets according
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Withdrawn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
GB9522985A
Other versions
GB9522985D0 (en
Inventor
Hermann Nawrot
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.)
NAWROT HERMANN SPEZIALPAPGMBH
Original Assignee
NAWROT HERMANN SPEZIALPAPGMBH
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 NAWROT HERMANN SPEZIALPAPGMBH filed Critical NAWROT HERMANN SPEZIALPAPGMBH
Publication of GB9522985D0 publication Critical patent/GB9522985D0/en
Publication of GB2294902A publication Critical patent/GB2294902A/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Withdrawn legal-status Critical Current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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/09—Layered products comprising a layer of metal comprising metal 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 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
    • 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
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/088—Layered products comprising a layer of metal comprising metal 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 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B27/34—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
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • 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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • 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
    • B32B2307/7246—Water vapor barrier
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • 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
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • 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
    • 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
    • B32B2379/00—Other polymers having nitrogen, with or without oxygen or carbon only, in the main chain
    • B32B2379/08—Polyimides
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

A composite sheet for use in mailing packings, in particular as a protection from water vapour permeation, comprises - an outer layer made of poly(alkylene terephthalate), polyalkylene or polyamide sheets, woven or non-woven fabrics, natural fibre or synthetic woven or non-woven fabrics, or paper; - optionally a low-pore aluminium foil; and - a heat sealable coating bonded to the previous layer which faces the packaged goods; characterized in that said heat sealable coating contains corrosion inhibiting additives for ferrous metals and/or non-ferrous metals.

Description

Composite Sheets The object of the present invention is a composite sheet for the use in mailing packings, in particular as a protection from water vapour permeation.
The prior art employs aluminium composite sheets in different combinations, in particular, for corrosion prevention and export packaging. Usually, poly(alkylene terephthalate), polyalkylene or polyamide sheets, woven or non-woven fabrics, natural fibre woven or non-woven fabrics as well as paper serve as the outer layer.
The composite sheets are used as a so-called barrier layer in the form of bags or case insets against diffusion of ambient moisture.
The goods thus packaged must be additionally protected from corrosion, for example, inside the packing, by means of desiccants or other materials containing corrosion inhibiting additives (often designated as VCI agents, VCI meaning "volatile corrosion inhibitor") . Those active substances may be incorporated in various substrate materials, for instance, paper, foams or plastic sheets.
However, the additional use of such substrate materials has proven disadvantageous with respect to expenditures for materials. Moreover, the addition of the substrate materials involves an additional manufacturing operation.
It has now been found, according to the invention, that a combination of composite sheet with a heat sealable coating containing corrosion inhibiting additives for ferrous metals and/or non-ferrous metals instead of the known polyethylene sheet avoids the necessity for an additional corrosion inhibition inside the packing by means of desiccants and/or other corrosion inhibiting additives.
This not only saves operating time but also additional packaging material, and relieves the environment.
The composite sheet according to the invention can be employed as a barrier layer without problems and processed into flat sheets, bags or case insets like known composite sheets.
In one manufacturing operation, potential corrosion inhibition is achieved for years.
Thus, a first embodiment of the present invention consists in a composite sheet for the use in mailing packings, in particular as a protection from water vapour permeation, comprising - an outer layer made of poly(alkylene terephthalate), poly alkylene or polyamide sheets, woven or non-woven fabrics, natural fibre or synthetic woven or non-woven fabrics, or paper; - a low-pore aluminium foil; and - a heat sealable coating bonded thereto which faces the packaged goods; characterized in that said heat sealable coating contains corrosion inhibiting additives for ferrous metals and/or nonferrous metals.
An alternative embodiment of the present invention consists in a composite sheet for the use in mailing packings, in particular as a protection from water vapour permeation, comprising - an outer layer made of poly(alkylene terephthalate), poly alkylene or polyamide sheets1 woven or non-woven fabrics, natural fibre or synthetic woven or non-woven fabrics, or paper; and - a heat sealable coating bonded thereto which faces the packaged goods; characterized in that said heat sealable coating contains corrosion inhibiting additives for ferrous metals and/or nonferrous metals.
By using the present invention, it is possible to provide composite sheets for the use in mailing packings, in particular as a protection from water vapour permeation, which avoid the necessity for additional desiccants and/or substrate materials containing corrosion inhibiting additives for ferrous metals and/or non-ferrous metals.
Particularly preferred poly(alkylene terephthalates) in accordance with the present invention are polyethylene and/or poly (butylene terephthalates). Particularly preferred polyalkylene sheets, woven or non-woven fabrics include those made of polyethylene and/or polypropylene. Similarly, natural fibres, for instance, cotton fibre woven fabrics, may preferably be used as the outer layer. Optionally, paper may be used in the same way as the outer layer.
The thickness of the aluminium foil is determined, in particular, by the water vapour permeability desired. Thus, it is possible to use the composite sheet as a purely mechanical reinforcement without a barrier layer against water vapour such that an outer layer as defined above is laminated immediately with the heat sealable coating. To ensure a sufficient water vapor barrier effect, it is preferred in accordance with the present invention to use the aluminium foil in a thickness of at least 7 Hm, in particular, 12 Sm or more.
To ensure sufficient heat sealability, the heat sealable coating too should have a minimum thickness. Thus, it is preferred in accordance with the present invention to use a thickness of the heat sealable coating of at least 50 ssm, in particular, 75 Um or more.
Preferably, said heat sealable coating is made of a polyethylene, especially LLDPE, LDPE, HDPE, a polypropylene, or mixtures or copolymers of the materials mentioned.
The corrosion inhibiting additives for ferrous metals and/or nonferrous metals can be incorporated in the heat sealable coatings by per se known methods.
It is particularly preferred in accordance with the present invention to select the corrosion inhibiting additives from amines, aminoimidazolines, aminophenols, nitrophenols, aminotriazoles, aldehydes, benzotriazole, dibenzylsulfoxide, dithiophosphonic acids, guanidine derivatives, ureas, phosphonium salts, sulfonium salts, sulfonic acids, thioethers, thioureas, and thiocarbamoyl disulfides. Such materials are per se known in the prior art, however, they are employed herein for the first time directly in connection with a composite sheet for the use in mailing packings, in particular as a protection from water vapour permeation, without being bound to separate substrate materials which are commonly used in the packaging containers of the prior art.
The bonding of the outer layer to the optionally present aluminium foil and the heat sealable coating bonded thereto can be performed in a variety of ways. Particularly preferred in accordance with the present invention is the use of solvent-free adhesives, in particular those based on polyurethane.
If a composite sheet without an aluminium foil is provided, it may be required in some cases to protect the packaged goods from solar radiation, especially action of light. For instance, it is possible to metallize the outer layer by methods known per se in the prior art.
The composite sheets according to the invention are particularly useful for the preparation of flat sheets, bags or case insets.
As has been mentioned earlier, the use of additional substrate materials containing corrosion inhibitors is not necessary.
The composite sheets according to the invention are particularly preferred for packaging consumer goods based on ferrous metals and/or non-ferrous metals which are susceptible to corrosion.
The following examples 1 to 4 represent embodiments of composite sheets according to the invention each containing an inhibitor for ferrous metals (dicyclohexylamine nitrite), as well as benzotriazole as an illustrative inhibitor for non-ferrous metals. It may generally be noted that the amount of the corrosion inhibiting additive for ferrous metals and/or nonferrous metals may be varied within the range of from 2 to 10k by weight, in particular of from 3 to 6% by weight.
Too low an amount of corrosion inhibitor will not yield a sufficient effect whereas too high an amount is uneconomic, on one hand, and in addition adversely affects the qualities of the composite sheet.
The set-up of the composite sheets according to the invention, by DIN (German Industrial Standard) 55531, may be represented as follows: Example 1: outer layer PET 12 ym adhesive LF PUR resin 1.8-2.0 g/m2 Al foil 15 Um, 99% pure adhesive LF PUR resin 1.8-2.0 g/m2 sealable coating LDPE 80 Um, containing 3% by weight of dicyclohexylamine nitrite Example 2: outer layer PET woven fabric 40/40 adhesive LF PUR resin 1.8-2.0 g/m2 PET 12 m adhesive LF PUR resin 1.8-2.0 g/m2 Al foil 15 Um adhesive LF PUR resin 1.8-2.0 g/m2 sealable coating LDPE 80 ym, containing 3% by weight of dicyclohexylamine nitrite and 3% by weight of benzotriazole Example 3: outer layer cotton woven fabric 15/15 adhesive LF PUR resin 1.8-2.0 g/m2 PET 12 im adhesive LF PUR resin 1.8-2.0 g/m2 Al foil 15 m adhesive LF PUR resin 1.8-2.0 g/m2 sealable coating LDPE 80 ym, containing 3% by weight of benzotriazole Example 4: outer layer paper 100 g/m2 LDPE 20 g/m2 Al foil 15 m adhesive LF PUR resin 1.8-2.0 g/m2 sealable coating LDPE 80 ijm, containing 3% by weight of dicyclohexylamine nitrite

Claims (10)

  1. Claims: 1. A composite sheet for the use in mailing packings, in particular as a protection from water vapour permeation, comprising - an outer layer made of poly(alkylene terephthalate) polyalkylene or polyamide sheets, woven or non-woven fabrics, natural fibre or synthetic woven or non-woven fabrics, or paper; - a low-pore aluminium foil; and - a heat sealable coating bonded thereto which faces the packaged goods; characterized in that said heat sealable coating contains corrosion inhibiting additives for ferrous metals and/or non-ferrous metals.
  2. 2. A composite sheet for the use in mailing packings, in particular as a protection from water vapour permeation, comprising - an outer layer made of poly(alkylene terephthalate), polyalkylene or polyamide sheets, woven or non-woven fabrics, natural fibre or synthetic woven or non-woven fabrics, or paper; and - a heat sealable coating bonded thereto which faces the packaged goods; characterized in that said heat sealable coating contains corrosion inhibiting additives for ferrous metals and/or non-ferrous metals.
  3. 3. Composite sheets according to claims 1 or 2, characterized in that said alkylene group is selected from ethylene and/or butylene.
  4. 4. Composite sheets according to claim 1, characterized in that said aluminium foil has a thickness of at least 7 Sm, in particular, at least 12 ijm or more.
  5. 5. Composite sheets according to one or more of claims 1 to 4, characterized in that said heat sealable coating has a thickness of at least 50 ssm, in particular, 75 Sm or more.
  6. 6. Composite sheets according to one or more of claims 1 to 5, characterized in that said heat sealable coating consists of polyethylene.
  7. 7. Composite sheets according to one or more of claims 1 to 6, characterized in that said corrosion inhibiting additive is selected from amines, aminoimidazolines, aminophenols, nitrophenols, aminotriazoles, aldehydes, benzotriazole, dibenzylsulfoxide, dithiophosphonic acids, guanidine derivatives, ureas, phosphonium salts, sulfonium salts, sulfonic acids, thioethers, thioureas, and thiocarbamoyl disulfides.
  8. 8. Composite sheets according to one or more of claims I to 7, characterized in that the layers are bonded together by means of solvent-free adhesives, in particular those based on polyurethane.
  9. 9. Composite sheets according to one or more of claims 2 to 8, characterized in that said outer layer is metallized.
  10. 10. A composite sheet for use in mailing packings, substantially in accordance with any Example hereinbefore described.
GB9522985A 1994-11-11 1995-11-09 Composite packing sheets Withdrawn GB2294902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE9418046U DE9418046U1 (en) 1994-11-11 1994-11-11 Composite films

Publications (2)

Publication Number Publication Date
GB9522985D0 GB9522985D0 (en) 1996-01-10
GB2294902A true GB2294902A (en) 1996-05-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9522985A Withdrawn GB2294902A (en) 1994-11-11 1995-11-09 Composite packing sheets

Country Status (3)

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DE (1) DE9418046U1 (en)
FR (1) FR2724341A1 (en)
GB (1) GB2294902A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005035396A3 (en) * 2003-10-08 2005-07-28 Storsack Uk Ltd Sleeve
EP1515840A4 (en) * 2002-06-05 2009-07-22 Creare Inc Protective cover system including a corrosion inhibitor
EP1560717B1 (en) * 2002-10-11 2010-12-15 Day International, Inc. Printing blanket and method for reducing corrosion and abrasion of printing blankets and blanket cylinders
US10301553B2 (en) 2017-02-28 2019-05-28 Ecolab Usa Inc. Use of sulfonium salts as hydrogen sulfide inhibitors
US10900128B2 (en) 2018-08-29 2021-01-26 Championx Usa Inc. Use of sulfonium salts as corrosion inhibitors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013006473U1 (en) 2012-10-02 2014-01-09 Hermann Nawrot Ag Spezialpapier- Und Folienwerk Multilayer plastic drug film

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GB2179002A (en) * 1985-07-02 1987-02-25 Nippon Foil Mfg Package structure
JPH0387252A (en) * 1989-06-15 1991-04-12 Sun A Chem Ind Co Ltd Evaporable anticorrosion film and production thereof
US5139700A (en) * 1988-08-23 1992-08-18 Cortec Corporation Vapor phase corrosion inhibitor material
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DE9418046U1 (en) 1994-12-22
GB9522985D0 (en) 1996-01-10

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