Manufacturing container or tube from paper; or other manufacturi – Tube making
Patent
1985-05-24
1987-04-07
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Tube making
493304, 493466, 53563, B31C 100, B31B 152
Patent
active
046557385
DESCRIPTION:
BRIEF SUMMARY
The present invention generally relates to the manufacture of containers, and the invention is more particularly directed to an apparatus for the manufacture of tubular container sleeves from a plane blank of cardboard, plastic, sheet metal, a thin laminated material or a similar material.
In the manufacture of certain types of containers, especially containers of rounded shapes such as containers having rounded corners or having a circular, elliptical or similar cross section, it has been customery to make a container sleeve which is closed at one end and which is filled with the material to be packed and thereafter closed at the opposite end.
The container sleeve can be manufactured in several different ways. The sleeve can be made by sprayforming or dieforming a plastic material or by winding a material spirally onto a mandrel whereafter the tube may be cut at the ends to a suitable length. This is a timeconsuming method which is not suitable for use in direct connection with the filling and the closing of the container, and the premanufactured container sleeves are bulky, and in many cases the container sleeves must be sterilized before being filled with the material to be packed. The latter method also gives a container which for many types of goods is not sufficiently liquid- and gasproof. Therefore there is a wish that the container sleeve be made in direct connection with the filling and the closing of the container, whereby the container sleeve should be made from a plane blank of cardboard, plastic, any laminated material, sheet metal or a similar material.
The formation of a container sleeve having rounded form, for instance rounded corners or having a circular, elliptical or otherwise rounded cross-section, causes some problems which are directly dependent on the fact that the container sleeve must have a carefully calculated inner size so that the bottom and top closures can be connected to the container sleeve to provide a wellsealed container. This is especially important in containers having inner bottom and top closures.
Several different methods are known in the art for making a container sleeve from a plane blank of cardboard or a similar material.
The German patent DE No. 29 28 773 discloses a method in which the sleeve is made inside an outer fixed mandrel by means of press semicylinders acting from inside the sleeve and thereafter possibly by means of concave press rollers acting from outside. This method is timeconsuming, expensive and complicated, the method is limited to a specific type and size of container and there are great demands on the fitting dimensions between the outer mandrel and the inner press semicylinders.
Therefore it is to preferred that the sleeve is formed from outside on an inner fixed mandrel, and such an outer formation method is disclosed in U.S. Pat. No. 4,349,345. The patent discusses the problems of having the container blank carefully fit and follow the mandrel at the rounded corners, and in this patent the formation problems have been solved by means of outer fixed formation jaws which at the upper rounded corners of the container provide a special compression of the corners by means of rotatably mounted wings. Also this apparatus is disadvantageous in that the method is limited to a specific type and size of the container sleeve and that it is important that the inner mandrel and the outer jaws carefully fit each other and the method is relatively slow, and the costs for the mandrel and the jaws are relatively high.
The German laid open publication DOS No. 23 05 702 discloses a method in which a container sleeve is made on a fixed inner mandrel by means of an elastic ribbon acting between two rotatable arms. Since the tension of the elastic ribbon is increasing as the arms are folded up and round the fixed mandrel the tension of the folding or sweeping ribbon is strongly changed during the formation and this may lead to stretchings and tensions in the container blank so that the container sleeve after having been removed from the mandrel may shrink or w
REFERENCES:
patent: 2473275 (1949-06-01), Brouns
patent: 3603220 (1971-09-01), Myers
patent: 4349345 (1982-09-01), Bodendoerfer
Esselte Pac Aktiebolag
Nilles James E.
Schmidt Frederick R.
Terrell William E.
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