Packaging comprising substrate, metallic layer and antifriction

Details Packaging comprising substrate, metallic layer and antifriction Packaging comprising substrate, metallic layer and antifriction

1986-07-25

1989-04-04

Ives, P. C.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428461, 428463, 428480, 428497, 428458, 4284744, 428521, 428522, 428523, 428900, 340407, 360 85, 360134, 361 271, 29 2541, B32B 1508, B32B 904, G11B 572, C09B 523

Patent

active

048186090

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a foil having two essentially plane parallel surfaces of which at least one is at least partially covered by a metallic layer.
Such foils are frequently used in modern packing technology. They are capable of imparting particularly good sales appeal to the packed goods. As the surface quality improves, it becomes easier to sell a good in a large number of outlets. Particularly in the food trade, customers are especially fond of goods which are surrounded by a foil having high surface quality. Furthermore, foils of this type are used for the production of decorations and displays. The drawback of such foils is that the surface quality frequently suffers during processing of the foil. In particular, the surface can be damaged in the processing machine by scratching. Scratches can, however, already affect the surface quality during manufacture of the foil. For example, it has been found that the surface quality suffers when the foil is coiled into rolls. When coiling the foil, the individual convolutions of a roll can press against one another so hard that the individual convolutions are influenced by neighboring convolutions. Thus, relative shifting of the individual convolutions, e.g., due to increases in length, which can cause scratches, occurs within the roll at very high pressure. These scratches frequently not only affect the appearance of the surface but also degrade the mechanical properties of the surface.


OBJECTS AND SUMMARY OF THE INVENTION

It is accordingly an object of the present invention to improve a foil of the above type in such a manner that it retains a largely uniform surface quality even when it is subjected to mechanical loads.
In accordance with the invention, this object is achieved in that the surface of the metallic layer is protected by an antifriction film.
This antifriction film does not only keep a variety of mechanical loads away from the surface. It is further adapted to form a lubricating layer on which a load acting upon the surface slides, particularly when the surface is loaded areally. The object constituting a load remain in the region of sliding friction so that scratching of the surface is prevented. In this manner, the antifriction film constitutes a lubricant which distributes itself over the entire surface and prevents direct loading of the surface. The great advantage of the antifriction film resides in that the antifriction medium which forms the antifricton film adheres to the objects constituting the load. In this manner, it is assured that a lubricating layer which prevents direct loading of the surface protected by the antifriction film is present between the objects and the surface protected by the antifriction film.
According to a preferred embodiment of the invention, the surface opposite the metal-coated surface is protected by an antifriction film. This antifriction film is capable of being at least partially transferred to the metal-coated surface as soon as these two surfaces contact one another. Such contact occurs at the latest upon coiling of the foil when the metal-coated surfaces lies against that surface of the neighboring convolution which is provided with the antifriction film. In this manner, a homogeneous antifriction film is produced which prevents the external appearance of the metallic surface from being affected by scratches. Moreover, the mechanical properties of the metallic layer are prevented from being affected by scratches. Such scratches cause the mechanical strength of the metallic layer to be reduced. In addition, they can become permeable to gases.
The invention further relates to a method of establishing protection for a foil having a metallic layer on at least one of its surfaces.
In methods of this type, the surfaces are frequently provided with a coating having great surface strength. This coating possesses the drawback of having a relatively easily scratched surface as is the case, for example, with metal-coated surfaces which are provided with a lacquer coating. The e

REFERENCES:
patent: 4396674 (1983-08-01), Somezawa et al.
patent: 4411945 (1983-10-01), Akao et al.

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