Package making – Methods – Enclosing contents within progressively formed web means
Patent
1996-03-13
1998-02-03
Sipos, John
Package making
Methods
Enclosing contents within progressively formed web means
53450, 53550, 53551, 53411, 15624411, 15624416, B65B 900
Patent
active
057131864
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of producing bag packs of plastic foil and filled with liquid or viscous contents, and an apparatus for carrying the method into effect.
BACKGROUND ART
Although liquid-filled bag packs of plastic material are relatively difficult to transport and not easy to handle, there is a market for bag packs intended for the distribution of liquid or viscous goods such as milk, soups etc. The reason for this is that the bag packs are cheap and that they are considered to be environmentally friendly, since they require slightly less material than formed and configurationally stable packaging containers of the disposable type. Bag packs of plastic foil are generally produced in that a web of plastic foil is folded double, that the free edge zones of the double-folded web are united with one another for the formation of a tube and that this tube, normally by metering, is filled with the intended contents and that the filled section of the tube is sealed off and separated from the remaining parts of the tube. The inconvenience inherent in this procedure is that it is necessary to work with very wide webs of material and that the process is not entirely hygienic, since that side of the plastic foil web which is to form the inside of the package is exposed to its ambient surroundings. Another known method is to operate using two separate pre-printed plastic foil webs which are reeled off from two separate magazine reels and are united with one another along their longitudinal edge zones for the formation of a tube of elongate and slim cross-section. The tube is filled and the packages are separated in known manner. The drawback inherent in this procedure is that the printed web face in the magazine reel will lie in contact with that side of the packaging material web which is intended to form the inside of the package. Such lengthy contact entails that flavour and aroma substances migrate from the printing ink to the web surface forming the inside of the package, which entails that the contents packed in the package will be tainted by taste and aroma from the printing ink. Another method is to roll up, on one and the same magazine reel, two separate webs pre-printed with information and advertising text, these webs being jointly unreeled and edge-sealed. The drawback inherent in producing bag packs from two separate webs which are unreeled from the same magazine reel is that it is difficult to adapt the printed text or decor on the webs to one another, for which reason a displacement easily occurs between the webs. This inconvenience may naturally be remedied by employing two separate webs which are unwound in a controlled and regulated manner from two separate magazine reels, this not, however, being desirable because of the previously recounted risks of taste tainting, as well as for operational reasons since the machine operator must then supervise two separate reel holders with consequential double reel change, and this method requires advanced regulation and control equipment in order that the webs be united in register with one another.
In yet a further prior art method, a tube or hose of plastic foil is produced in that a molten plastic material is forced under pressure through an annular extruder nozzle, and in that the thus formed tube or hose is expanded with the aid of gas introduced into the hose at slightly higher pressure than the pressure acting on the outside of the hose.
A method of this type is disclosed in GB, A, 670313. In this method, the extruded hose which, if necessary, may be divided into a plurality of part webs, is flattened. However, on being flattened out, the extruded tube or hose is not disposed to cause the insides of the hose to adhere to one another, for which reason bacteria-contaminated air cannot be prevented from penetrating in between the above-mentioned insides. After production of the finished bag, a sterilisation treatment of the contents of the bag is therefore necessary.
A method of this latter type is also disclosed i
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Sipos John
Tetra Laval Holdings & Finance S.A.
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