Conical stacking tube body and method of producing the same

Stock material or miscellaneous articles – Hollow or container type article – Paper containing

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428 369, 428 3691, 428 3692, 428132, 428133, 24211832, 2421183, 206505, 206519, 493287, 493296, 138147, 138177, B65H 7518, B65H 7550

Patent

active

054036330

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention refers to a conical, hollow, stacking tube body made of paper or of another organic moulded material, the inside of which, in the area of its inwardly tapering end, possesses at least one dimple serving to maintain a defined gap between the stacked tube bodies.
Conical stacking plastic products, for example plastic beakers, have been provided heretofore which contain moulded dimples to prevent the conical objects from being pushed too far into each other when nested, and so avoid an unwanted wedging effect. In tube bodies produced of paper, in particular those produced by winding from paper webs, it is not possible to form dimples for this purpose. Attempts have been made to create internal spacing means by embossing neps into a paper web which forms the inside of a wound tube body. However, this measure complicates the winding process and does not guarantee that the internal spacing means are formed in the correct position. In addition, the spacing means thus formed have proven to be of insufficient strength, as they can be easily squashed on contact with the bottom wall of a nested tube body. Automation of spooling frames with automatic removal of bobbin tubes which are made of paper or another organic moulded material from a bobbin stack, however, requires measures which prevent wedging of the nested conical tube bodies.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a conical stacking tube body and a method of producing the same, which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide a method of producing a conical stacking tube body, and a hollow tube body, which is made of paper or another organic molding material and which is capable of being stacked, in such a way as to securely prevent wedging of the tube body in the tube stack.
The aforementioned object is achieved using the initially described tube body according to the present invention by the provision of an internal dimple created following completion of the tube body in the form of a wall projecting forward into the tube which is created from the outside. Internal dimples created from a punched tab in the wall of the tube are the most suitable, whereby the free end of the punched tab which is bent inward is pointing towards the wider end of the tube body, so preventing the bottom wall of a nested second tube from pressing the punched tab back onto the level of the tube casing. Where it is essential for openings to be avoided in the tube casing, the inner spacing means can be formed by projections in the wall which only create an indentation on the outside of the tube body.
The formation of the tube body as provided by the invention requires no modification of the tube body production process. Tube bodies are wound, for example, in the conventional way from paper webs with a smooth inner surface, or with a smooth inner surface made of cellulose pulp. Only after their completion are the tube bodies provided with the described internal dimple using simple devices which do not necessitate interruption of the continuous production process. In the case of tube bodies formed from fibre stock, the dimples can be made while in a semi-dried state, so permitting the tube body to stiffen during the remaining drying process.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 demonstrates a schematic central longitudinal section of three nested tube bodies;
FIG. 1a shows the same arrangement as FIG. 1 with altered tube bodies;
FIG. 2 shows a side view of the stack of tubes in the direction of arrow II indicated

REFERENCES:
patent: 2017611 (1935-10-01), Stogner
patent: 2195240 (1940-03-01), Chaplin et al.
patent: 2569094 (1951-09-01), Dunlap
patent: 2615650 (1952-10-01), Betner et al.
patent: 3463352 (1969-08-01), Heister
patent: 3643888 (1972-02-01), Blue
patent: 3675871 (1972-07-01), Heyden

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