Package making – Methods – Closing package or filled receptacle
Patent
1997-09-26
1999-07-20
Harrison, Jessica J.
Package making
Methods
Closing package or filled receptacle
53 75, B65B 708, B65B 5702
Patent
active
059242671
DESCRIPTION:
BRIEF SUMMARY
The invention first of all relates to a process for closing filled open-top folded-carton packages made from bottom-sealed tubular sections, whereby closing is by sealing and folding over the gable seam or the ridge seam respectively, by ultrasonic welding by means of an anvil comprising a recess for the longitudinal seam of the folded-carton package and a sonotrode.
In addition, the invention relates to a device for filling such folded-carton packages and closing the gable seam, with a supply unit for the tubular sections, a prefolding unit, a filling unit, a closing unit comprising an anvil and a sonotrode, and transfer and transport devices for the folded-carton packages, whereby the anvil has a recess for the longitudinal seam of the folded-carton package.
Cuboid flat-gabled packages and processes for their closure are known (GB-PS 15 09 622) which are predominantly used in the area of packaging of liquids, with normal cold, cold-sterile, hot, and aseptic filling. In this process, an attempt is made to close the packages immediately after filling in order to reliably prevent any possibility of contamination of the contents of the package.
It is known to shape folded carton cutouts provided with folding grooves, glued together to a tubular section, for example on a rotating mandrel wheel with radially arranged mandrels of rectangular shape, and to close them at the bottom end with a seal. In this process, cardboard composite material able to be hot sealed is used as a cutout material. The folded-carton containers made in this way, which are bottom-sealed and open at one end, are taken off the mandrels by a transfer station and placed on a level and straight-line transport device comprising numerous cells. This transport device transports the containers in a row, step by step, at first through a sterilising station and further downstream through one or several product outlets arranged behind each other at the distance of the containers. Once the folded-carton packages have been filled, the packages must be closed at their top end by sealing the so-called ridge seam or gable seam. To this end, first the upper area of the folded-carton package is prefolded into a ridge seam. Actual welding of the ridge seam formed in this way is by way of an anvil and sonotrode.
In order to be able to guarantee optimal tightness of the package, ultrasonic welding must occur with a certain pressure and with precisely positioned welding equipment, so that the area of the folded-carton package containing the longitudinal seam in the ridge seam or gable seam, too, can be reliably sealed. From practical application it is already known to provide the anvil in the area of this longitudinal seam with a recess, in order to enable optimal sealing of the gable seam. In this way, excessive surface pressure in the area of the longitudinal seam can be avoided.
If however the position of the recess in the anvil does not exactly match the true position of the longitudinal seam of the folded-carton package, then on one side of the longitudinal seam so-called "channel formation" and on the other side burn marks as a result of excessive surface pressure occur. This can lead to lack of tightness of the package in the area of the welding seam closing the top of the package. Increasing the sealing pressure or the welding time may not satisfactorily solve the disadvantages described above.
It is thus the object of the invention to embody and improve the process for closing filled folded-carton packages, and the respective device, in such a way that the above-mentioned disadvantages are avoided with certainty, in order to achieve optimal tightness of the filled folded-carton packages.
With regard to the process, this object is met in that prior to ultrasonic treatment of the package, the following steps are carried out: package in relation to a cell transporting the folded-carton package, and folded-carton packages until the recess for the longitudinal seam matches the actual position of the longitudinal seam of the next folded-carton package to
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Bomer Hans
Mainz Hans-Willi
Harrison Jessica J.
Paradiso John
SIG Combibloc GmbH
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