Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Patent
1997-11-26
1999-08-10
Krynski, William
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
428 357, 428192, 428195, 428196, 428197, 428202, 428346, 428349, 229 8701, 2065241, 53390, 47 72, B32B 900
Patent
active
059356863
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a packaging wrapper for articles, the said wrapper being closed by means of at least one twist.
The invention also relates to the production of a packaging closed by twists.
In particular, the invention relates to the field of the packaging of confectionery products
DESCRIPTION OF RELATED ART
Confectionery products are generally packaged individually in a portion of preprinted film of appropriate size and shape, it being possible for these individually packaged products to be in their turn packed in bulk in a small packaging bag of an appropriate size. Typically, the article to be packaged is first of all completely wrapped in a rectangular piece of film and the wrapper thus formed is closed by twists at two points situated on either side of the article to be packaged.
It will be noted that these packages are not always closed by two twists. It is possible, for example, to deposit the article to be packaged in the centre of a suitable piece of film, the sections of which extending beyond the article are folded on top of the said article before the wrapper thus formed is closed by twining the said sections into a single twists.
In the context of the present invention a twist is intended to mean the result of the closure of the said wrapper by twining.
An important problem which arises where this is concerned is that of the retention of the twist. This retention can be obtained only at the cost of a particular choice of the film employed as substrate, which must exhibit appropriate mechanical characteristics, such as pliability or, in particular, a pronounced tendency not to return to its initial position after the twining of the said film.
In particular, this problem becomes apparent during the packaging of articles of small sizes and of substantially round section, such as confectionery products like, for example, bonbons, lollipops, barley sugar, fruit jellies, chocolate-coated bars or more bulky products like bottles, rolls of articles etc.
As solution, it is known to select particular substrates known for their high pliability, like waxed paper or cellophane, or else synthetic films containing an appropriate quantity of an additive increasing the pliability of the said substrate.
This solution is obviously not satisfactory insofar as it considerably restricts the possibilities of choice of films employed as packaging substrate and insofar as it considerably increases the cost.
Packages closed by twists, which are produced from substrates precoated with a heat-sealing coating, are known on the market. When twists are formed at the ends of the wrapper containing the article to be packaged, a source of heat at a temperature of approximately between 120 and 160.degree. C. is approached for a certain period of time--in general it is the jaws performing the twining that are heated, but it is also possible to blow hot air by means of a pipe of appropriate size--over the said twists, and this has the result of melting the heat-sealing coating and the sealing of the twist thus formed when the said heat-sealing coating is cooled.
This solution enables the choice of the packaging substrate to be widened, but is nevertheless still not entirely satisfactory, insofar as it does not permit the selection of a substrate which has a low strength at elevated temperatures and, what is more serious, it is completely unsuitable for the packaging of heat-sensitive articles, in particular the products of chocolate manufactures. Another defect of this solution is the relatively low speed which it imposes; it is necessary, in fact, to keep the twists and the heating element in contact for a sufficient time to produce the melting of the sealing coating.
It is generally considered that the packaging of 800 articles per minute is the highest rate that it is possible to obtain with a packaging unit operating on the principle of closure of the wrapper by twining and heat-sealing of the twist thus formed.
To overcome the disadvantages of heat-sealing and without being restricted in the choice of the
REFERENCES:
patent: 4663219 (1987-05-01), Janocha et al.
Daelmans Eddy
Vanoppre Raymond
Bahta Abraham
Krynski William
Transpac N.V
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