Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1995-11-22
1999-08-03
Thibodeau, Paul
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428 341, 428325, 428327, 428480, 428515, 206531, 206532, 206539, 53173, B32B 516
Patent
active
059323388
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a film for tamper-proof coverings for product carriers, such as those known, for example, from a plurality of so-called blister packagings.
Such known films for blister coverings have so far consisted of aluminum films, plastic-coated aluminum films up to pure, transparent or opaque plastic films. These films form the counterpart to the product carrier or the so-called lower part of the package which can, again, be formed from a plurality of materials, for example from a stable cardboard layer, a plastic or aluminum tray adapted to the shape of the product or the like.
The problem so far with using plastic films as blister coverings was the fact that pressure-sensitive products, in particular, could not be pressed through the film and thus removed from the packaging without this leading to damage to the products, in particular in the case of tablets.
For this reason, when using films as cover portion for such packages either one resorted to aluminum foils, as is, in particular, the case for the packaging of pharmaceutical products, such as, e.g., tablets, ampoules or capsules, or a dispensing possibility was provided in the lower part of the package.
The object of the present invention is to provide a film for tamper-proof coverings for product carriers which can be produced from plastics and nevertheless displays the known push-through properties of aluminum foil coverings.
This object is accomplished in accordance with the invention, in the film described at the outset, in that the film is an undrawn film with a plastic matrix comprising polyolefins, polyester, polystyrene or styrene copolymers and contains a particulate filler in an amount of 20 to 60% by weight, wherein the filler has an average particle size (measured over the greatest extension of the particle) of approximately 5 .mu.m to approximately 100 .mu.m and is selected such that the penetration resistance of the film is reduced to below a limit of approximately 200N/mm (measured on a film 150 .mu.m thick, measuring method according to German Industrial Standard DIN 53373).
This limit applies to films approximately 150 .mu.m thick. For films which are considerably thinner or thicker, the corresponding limits can be derived from these values. With the specified limit it is possible to push products insensitive to pressure through the cover film of the product carrier, even if this entails some expenditure of force. With more sensitive articles, a lower limit will preferably be selected for the penetration resistance, and this value is then preferably at approximately 100 to approximately 200N/mm. Lower penetration resistances may be recommendable in individual cases where goods very sensitive to pressure are packed. However, in this respect it is to be noted that the protective effect of the packaging against damage to the goods themselves is, of course, decreased with the reduction in the penetration resistance and so the numerical range specified above of approximately 100 to approximately 200N/mm is in many cases to be seen as an optimum.
For the handling of the package by the consumer, i.e. in particular during opening of the package and, therefore, the product, a further property comes into secondary play, the so-called resistance to further tearing which determines the amount of force necessary to tear further open a film which has been pierced once and so release the product. This property can also be influenced by the choice of the filler as well as its proportion in the plastic matrix, whereby in this case a resistance to further tearing of less than 30N (measuring method according to DIN 53363) is aimed for. This numerical value applies in particular to films approximately 150 .mu.m thick but can essentially also be used for considerably thinner or thicker films. A value for the resistance to further tearing which is acceptable for the handling, in particular, of pressure-sensitive goods, is between approximately 2 and 12N, whereby it is to be noted in this case as well that considerably smaller values are, o
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ISO 7765-1: 1988(E); "Plastics Film and Sheeting--Determination of Impact Resistance by the Free-Falling Dart Method"; Dec. 15, 1988; pp. 1-7.
ISO 7765-2: 1994(E); Plastics Film and Sheeting--Determination of Impact Resistance by the Free-Falling Dart Method; Aug. 15, 1994; pp. 1-11.
Emig Jurgen
Lubemann Henning
Schmidt Norwin
Schnabele Jurgen
Wolfsbanger Anton
BP Chemicals Plastec GmbH
PCD Polymere Gesellschaft
Tarazano D. Lawrence
Thibodeau Paul
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