Packaging material

Details Packaging material Packaging material

2000-02-28

2001-08-21

Loney, Donald J. (Department: 1772)

Stock material or miscellaneous articles

Composite

Of metal

C428S172000, C428S207000, C428S209000, C428S210000, C428S702000, C428S916000, C206S807000, C427S405000, C427S419200

Reexamination Certificate

active

06277496

ABSTRACT:

The present invention relates to forms of packaging or packaging aids having an integral guarantee of first-time opening and/or of original pack containing a substrate with a reflecting surface and a process for manufacturing such forms of packaging or packaging aids.
It is known to make forms of packaging or packaging aids secure against falsification using holograms, colour codes or invisible features. In order to be able to determine whether a package has already been opened, either with or without permission, a guarantee of first-opening is provided on the package itself This guarantee enables the customer to see if the purchased item has actually been produced and packaged by the desired manufacturer and isi not an imitation or falsification. The first-opening guarantee may e.g. be in the form of a label, stamp or sealing strip etc. which is positioned e.g. over a closure on a bottle or wide necked glass, over the seam joining the lid and a container or over the tear-off closure on a pouch. On opening the packaging in question, the label, stamp or sealing strip is broken, showing that the package has already been opened. It is also possible to transfer or enclose items on repackaging such that—by means of characteristic, unmistakable features that cannot be copied—it is clear which supplier packaged the goods in question.
In practise holograms e.g. have found use for this purpose. Examples of this are hologram labels or lidding foils with integral holograms. It is, however, extremely expensive to product, holograms. In view of the fact that forms of packaging and packaging aids are employed for short-lived products that are used only once, efforts are being made to provide forms of packaging or packaging aids that are cost-favourable to produce, but cannot be easily falsified.
That objective is achieved by way of the invention in that, provided on the reflecting surface (
11
) of metal or on the metallic reflecting surface (
11
) is a single or plurality of layers of one or more ceramic layers (
12
,
14
,
16
) containing or comprising a compound having the formula SiO
x
, where x represents a number from 1.5 to 2.0, each layer having a thickness of 50 to 2000 nm (nanometre), and over the surface of the ceramic layer or over at least one of the surfaces of the ceramic layers, a layer (
13
,
15
,
17
) which is semi-permeable for visible light is provided, said layer being of metal and having a thickness of 0.2 to 60 nm (nanometre), and is such that light striking the coated substrate is reflected and the reflected light is seen as different colours depending on the direction or angle at which it is observed.
The integral guarantee of first-time opening and/or of origin on the packaging or packaging aid according to the present invention can always be recognised by the observer under daylight or artificial light, directly and without the assistance of any kind of apparatus. The colour or shade of colour seen by the observer depends on the direction or angle at which the package or packaging aid is viewed.
The substrate employed may e.g. be any kind of packaging material of choice. The packaging material may be rigid, semi-rigid or flexible and may be a shaped body or, in particular, a film or foil-type material. Examples of shaped bodies are blown, deep-drawn and/or stretch-drawn or deepened shaped bodies such as bottles, wide-necked containers, beakers, dishes or base parts of push-through packs. Examples of foil-type materials are metal foils of aluminium, steel, copper, silver or gold. Other examples of foil-type materials are paper such as tissue paper with a weight per unit area of 20 to 30 g/m
2
or highly whitened paper having a weight per unit area of 40 to 60 g/m
2
, cardboard, semi-cardboard or the like. Important are in particular films containing plastic e.g. plastics based on polyolefins, polyethylenes or polypropylenes, polyamides, polyvinylchloride, polyesters such as polyalkylene-tterephthalates and in particular polyethylene-terephthalate. The films containing plastic may be monofilms of plastics, laminates of two or more plastic films, laminates of metal foils and plastic films, laminates of two or more plastic films, laminates of metal and plastic films, laminates of papers and plastic films or laminates of papers and metal foils and plastic films. The individual plastic films may be e.g. from 12 to 100 &mgr;m thick and the metal foils from 12 to 100&mgr;m thick. Substrates and also laminates may be e.g. of papers, semi-cardboard, cardboard and metal foils. The individual layers of foil type materials may be joined together by means of adhesives, laminating agents, bonding agents an/or by extrusion coating, co-extrusion or laminating etc.
Preferred substrates are non-oriented or singly or biaxially oriented monofilms or laminates of two or more non-oriented or singly or biaxially oriented plastic films based on polyolefins such as polyethylenes or polypropylenes, polyamides, polyvinylchloride, polyesters such as polyalkylene-terephthalates and in particular polyethylene-terephthalate. For example mono-films acting as the basic substrate may be provided with the layers according to the invention and, in subsequent processing steps, the monofilms deposited in further layers until the final substrate has been formed.
Further typical examples of substrates have the following make up:
a) a first layer containing a non-oriented, singly or biaxially oriented monofilm or a laminate of two or more non-oriented, singly or biaxially oriented films of plastics based on polyolefins such as polyethylenes or polypropylenes, polyamnides, polyvinylchloride, polyesters such as such as polyalkylene-terephthalates and in particular polyethylene-terephthalate and/or a paper such as tissue paper with a weight per unit area of 20 to 30 gm/m
2
or a highly whitened paper of 40 to 60 gmn/m
2
, or a protective layer of organic coating,
b) a second layer such as a metal foil and in particular aluminium foil,
c) a third layer in the form of a deposited layer of hot sealing organic material; or
a) a first layer, as described above,
b) the second, layer as described above,
c) a third layer of non-oriented, singly or biaxially oriented monofilm or a laminate of two or more non-oriented, singly or biaxially oriented films of plastics based on polyolefins, such as polyethylenes or polypropylenes, polyamides, polyvinylchloride, polyesters such as such as polyalkylene-terephthalates and in particular polyethylene-terephthalate or a cast polyethylene coating; or
a) this layer omitted,
b) a first layer, such as a metal foil and in particular an aluminium foil,
c) a second layer containing one or more singly or biaxially oriented monofilm or a laminate of two or more non-oriented, singly or biaxially oriented films of plastics based on polyolefins, such as polyethylenes or polypropylenes, polyamides, polyvinylchloride, polyesters such as such as polyalkylene-terephthalates and in particular polyethylene-terephthalate, and/or a paper such as a tissue paper with a weight per unit area of 20 to 30
30
g/m
2
or highly whitened paper having a weight per unit area of 40 to 60 g/m
2
, or a protective organic coating.
As a rule the first layer a) faces outwards from the packaging or is itself the outward facing side of the packaging. Accordingly, the reflecting surface is situated on the free surface of layer a) or the free side of layer b) represents the reflecting surface. On using available packaging material e.g. as lidding material for covering transparent containers, such as transparent base parts of blister packs or transparent beakers or the like, a reflecting surface and the series of layers according to the invention deposited thereon may be directed towards the inside of the package and be visible through the transparent base part, beaker or the like.
The substrate must exhibit the outer lying surface that reflects visible light. For that reason it is necessary for the paper, cardboard or semi-cardboard, monofilms or laminates with outer lying plastic layers to feature a reflecting s

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