Package making – Methods – Forming or partial forming a receptacle and subsequent filling
Patent
1997-04-18
1998-06-02
Coan, James F.
Package making
Methods
Forming or partial forming a receptacle and subsequent filling
53559, 53578, 493 85, 493109, B65B 4700
Patent
active
057584753
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of producing a tinned food container wherein the container body consists of a flat material, especially aluminium strip or tinplate strip which is deep-drawn and which, at least in the region of its planar edge flange, is provided with a coating, especially a sealing coating and wherein a cover provided with a further coating, especially a further sealing coating, and consisting of a foil material, especially aluminium foil, is sealed on to the edge flange under the influence of pressure and/or heat.
Such a method is known from DE 33 44 441 wherein the container body and cover are sealingly connected to one another by the sealing-on operation in that the sealing coating is sealed on by means of a sealing tool under the influence of pressure and/or heat. The sealing-on operation takes place after the container body has been filled with the material to be preserved. However, during the filling operation it cannot be guaranteed that parts of the material to be preserved do not reach the planar edge flange of the container body. This means that the sealing layer is interrupted and that leakage problems may occur during the subsequent sealing operation.
This is the reason why there exist methods of producing a tinned food container wherein, in addition to the container body, there is produced an intermediate sealing layer (a so-called "sealing ring") which, in turn, is connected to the cover or cover foil in a material-locking way and which is placed on to the edge flange of the container body after the container has been filled. However, the disadvantage of such a method is that the container body and the intermediate sealing layer usually provided in the form of a sealing ring have to be produced separately from one another. The production of the sealing ring results in a high percentage of production-related waste because the only part used is the surface which is subsequently placed on to the edge flange, whereas inside the annular region and towards the adjoining ring there remain unused surface parts of the flat material.
A further method of the initially mentioned type is known from DE-OS 15 86 288 wherein use is made of an additionally inserted intermediate sealing layer which consists of a thermoplastic material.
It is therefore the object of the invention to improve the economic aspects of a method of the initially mentioned type.
The objective is achieved in that for producing a container body with an intermediate sealing layer additionally inserted during the sealing-on operation, first the blank for the container body and intermediate sealing layer is punched in one piece out of the flat material, with the intermediate sealing layer subsequently being separated from the container body in the region of the edge flange, and that, then, after the deep-drawn container body has been expanded towards its edge flange and/or after the dimensions of the intermediate sealing layer have been reduced, the intermediate sealing layer is placed on to the edge flange.
The invention is characterised by the fact that the production method is rendered more economical in that by producing the intermediate sealing layer and the container jointly, the amount of waste material (percentage of scrap) is reduced considerably because the entire material of the blank of the container body and intermediate sealing layer can be used. By increasing the size of the edge region, the edge flange and sealing ring can be formed jointly. By subsequently separating the sealing ring from the edge flange region, the blank does not contain a percentage of scrap. Reconnection of the container body with the intermediate sealing layer provided with the cover can be effected easily in that either the container body is expanded towards the edge flange or the intermediate sealing layer is reduced in respect of its dimensions. Said two adaptation processes can also be combined.
In a preferred embodiment, the intermediate sealing layer is provided in the form of a sealing ring whose contour corresponds to that of
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patent: 5249447 (1993-10-01), Aizawa et al.
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Breuer Manfred
Hocks Klaus
Coan James F.
Kim Gene L.
Vaw Aluminium AG
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