Manufacturing container or tube from paper; or other manufacturi – Tube making – With advancing of tube axially
Patent
1994-06-27
1996-10-29
Lavinder, Jack W.
Manufacturing container or tube from paper; or other manufacturi
Tube making
With advancing of tube axially
493304, 413 72, B29C 5350, B29C 5354
Patent
active
055691447
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process as set forth in the classifying portion of claim 1.
Tube bodies, in particular tube members for the production of packaging tubes, are produced using two known processes. In regard to tube bodies which are produced using those processes, a distinction is made between so-called foil tubes and extrusion tubes. After the operation of shaping a web of foil into a tube shape, the foil tubes are formed by welding mutually overlapping edges of the shaped foil web, that operation being referred to as longitudinal seam welding, while extrusion tubes, without a side seam, are formed by means of extrusion, that is to say by pressing liquefied plastic material through extrusion tools.
Foil and extrusion tubes have individual advantages and disadvantages which cause the use thereof to be directed towards certain materials to be packaged. Foil tubes, by virtue of a suitable multi-layer structure of the foil employed, can be relatively easily adapted to delicate or sensitive materials to be packaged, for example materials containing expensive and volatile fragrance constituents, while for the same purpose, that is to say as a diffusion barrier, when using an extrusion tube, individual tube bodies have to be fitted one into the other. The advantage of simple adaptability to the packaging material, in respect of foil tubes, is reduced in significance, in comparison with the extrusion tube, by virtue of the presence of the visible longitudinal welded seam, insofar as the aesthetic appearance of a tube of that kind will be adversely affected by the seam. Due to the welding operation, it is not possible to .apply printing around a foil tube, in contrast to an extrusion tube without a welded seam. After an extrusion tube has been separated from an elongate tube portion issuing from an extruder, printing is applied to the extrusion tube by mounting it on a mandrel and rolling it against one or more rotary printing rollers. That method of applying printing sets clear limits in regard to the quality of printing that can be achieved, in that image reproductions are not satisfactory in all parts of the printing, in regard to the degree of sharpness thereof. Half-tone qualities are also subject to visible limits. Those limitations do not occur in the case of foil tubes as printing is applied to the foils while in the flat condition, before they are shaped and before the edge welding operation. Although the extrusion tube is inferior to the foil tube in regard to technical adaptation to packaging material and quality of printing, the extrusion tube is preferred by the cosmetic industry for packaging high-quality cosmetic products, because of the absence of the longitudinal seam, even if the qualities of printing therearound are unsatisfactory. There are therefore tube characteristics of aesthetic nature, which ensure that an extrusion tube is preferably used for products of the above-indicated kind in the cosmetic industry.
In consideration thereof, the object of the present invention is to provide a process for the production of tube members, which is of such a nature that tube members produced in accordance with that process combine the advantages but not the disadvantages of the known foil and extrusion tubes.
In accordance with the invention that object is attained by the features recited in the characterising portion of claim 1.
The object of the present invention is attained by means of a foil tube with a novel edge welding configuration. It is known for the edges to be welded together in an overlapping position, so that the edges at least partially flow one into the other during the welding operation. That welding method presupposes a relatively high perpendicular pressure applied to the peripheral surface of the edges, that is to say the edge or edge portion, constituting the inner and outer edges after shaping of the tube body, of the foil strip of fusible plastic materials, so that visible deformations remain behind on the outer surface of the foil tube, due to the use of pressing tools, in
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Day Christopher W.
KMK Karl Magerle Lizenz AG
Lavinder Jack W.
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