Package making – Methods – Applying a partial cover
Patent
1995-02-27
1997-05-20
Sipos, John
Package making
Methods
Applying a partial cover
53412, 53441, B65B 2100
Patent
active
056303076
DESCRIPTION:
BRIEF SUMMARY
The present invention provides a method and a quick-opening plastics film wrapping for articles.
More precisely, the invention relates in particular to wrapping articles such as bottles, cans, jars, etc. in a plastics film that also allows the wrapping to be opened quickly by tearing to provide convenient access to the articles. To provide a clamping effect on the articles, the plastics film may be heat shrunk or stretched, and the wrapping is closed by heat-sealing or by adhesive.
It is becoming more and more common for articles to be offered for sale in packs comprising a certain number of the articles, for example bottles of mineral water are grouped together in sixes and are wrapped in a plastics film. The film allows the various articles to be held together very securely, and by construction it often has an opening at each end. When the user seeks to tear off the wrapping to take hold of an article, e.g. a bottle, this operation is not always very easy since, by definition, the plastics film used is very strong.
It is also advantageous to have a wrapping film available which is capable of being torn in a plurality of directions depending on the type of wrapping performed.
An object of the present invention is to provide a method and a wrapping of articles in a plastics film that is easily opened by tearing of the film so as to gain access to the wrapped articles while nevertheless ensuring that the considerable mechanical strength of the wrapping is maintained during handling of the wrapped articles.
To achieve this object, the method of making a quick-opening wrapping for packaging objects is characterized in that it comprises the following steps:
a weight percentage of an embrittling agent is added to at least one extrudable plastics material;
a monolayer film is made from said composition by monoextrusion; and tear initiator means are provided in said portion of the film whereby it is possible to tear said wrapping in the direction that is predetermined by said initiator.
It will thus be understood that the wrapping has a composition that is homogenous overall, and that because of the presence of the embrittling agent, it is possible to tear the wrapping along a direction that corresponds to the particular implementation of the means forming the tear initiator. The tear direction is preferably either in the film extrusion direction, or else in the direction perpendicular thereto.
The means forming the tear initiator may be constituted by a pre-cut in the plastics film, or by the installation of a tear tongue close to an open edge of the film that forms the wrapping.
The mix of raw materials required for making the film is based on any substance that is (completely or partially) ionomerized with acid copolymers such as ethylene acrylic acid (EAA), ethylene methylacrylic acid (EMA), or others, optionally partially neutralized with cations, be they zinc, sodium, or others.
Preferably, the concentration by weight of the embrittling agent lies in the range 5% to 30%.
The quick-opening wrapping for objects is characterized in that it comprises a monolayer film of plastics material containing an embrittling agent and surrounding said objects at least in part, together with at least one tear initiator means whereby said wrapping can be tom by hand in at least one predetermined direction.
Other characteristics and advantages of the present invention appear more dearly on reading the following description of various implementations of the invention given as non-limiting examples. The description refers to the accompanying drawings, in which:
FIG. 1 is a side elevation view of a first embodiment of wrapping for wrapping together a group of bottles;
FIG. 2 is an end view of the FIG. 1 wrapping;
FIG. 3 is a diagram showing a first embodiment of the tear initiator;
FIG. 4 is a diagrammatic view showing a second embodiment of the tear initiator;
FIG. 5 is a diagrammatic view showing a third embodiment of the tear initiator;
FIGS. 6, 7, and 8 are respectively an elevation view and plan views of wrappings provided
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Generale de Grandes Sources
Sipos John
Tolan Ed
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