Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1998-06-10
2000-05-30
Stemmer, Daniel
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156198, 1563066, B29D 2320
Patent
active
060687177
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a process for the production of packaging tubes as set forth in the classifying portion of claim 1.
The manufacture of packaging tubes comprising a tube body portion formed by a single-layer or multi-layer plastic laminate, the term multi-layer plastic laminate also includes a plastic laminate containing a metallic (aluminium) barrier layer, and a tube head which is formed from a plastic material, is essentially dominated by two technologies which differ in that one of them involves joining a prefabricated tube head to a tube body portion (hereinafter also referred to as the `finished-head technology` for the sake of brevity) while in the other technology the tube head, as it is being formed, that is to say shaped, is joined to the tube body portion (hereinafter also referred to as the `moulding-on technology` for the sake of brevity). The invention lies in the field of the former, that is to say in the field of the finished-head technology.
In the tube industry, the finished-head technology has experienced a not insignificant spread. That is because the outputs of tubes (body portions with head) per unit of time are higher in comparison with the moulding-on technology. That involves simple machine operations for bringing heads and tube body portions together, relatively low levels of capital investment costs for the head/body portion joining apparatuses and the possibility of fitting the head with closures etc in the course of the process, that is to say immediately after the head/body portion connection has been made. The disadvantages of the finished-head technology lie in the very close production tolerances of the tube body portion and the head. Added to that are material compatibilities, which have to be accurately matched, between the material of the inner layer of the tube body portion and the material of the tube head, the inner layer representing the critical component of a good connection between the body portion and the head. For example the connection of a body portion comprising polyethylene or having an inner layer of polyethylene, to a tube head of the same material, is difficult to such an extent that, to overcome the difficulties involved, the shoulder of the tube head (connection from the tube body portion to the discharge nozzle of the tube) is to be provided with a barrier or a blocking layer. That critical material compatibility is an impediment to making full use of the advantages of the finished-head technology, insofar as the body portions and the heads of different materials can admittedly be prefabricated and stored, but they cannot be combined just as may be desired, for the purposes of satisfying different requirements in terms of material to be packaged.
SUMMARY OF THE INVENTION
Taking that state of the art as its basic starting point, the object of the present invention is to develop the finished-head technology in such a way that the advantages thereof are retained but the disadvantages thereof are eliminated.
The process according to the invention for connecting a tube body portion to a prefabricated tube head achieves the following advantages, in regard to that process. The close tolerances for the tube body portion and the tube head, which are required in the state of the art, can be considerably increased, with the consequence of easier and faster manufacture, that is to say shrinkages in head production and deviations in diameter in production of the tube body portion are no longer causes for rejection of the components. The process according to the invention can be operated with relatively low pressing pressures--a relatively small portion of material is pressed against a tube shoulder with embedding of a peripheral portion at the open end of the tube body portion into the portion of material--and at comparatively low tool temperatures, whereby the technical configuration of the pressing tools is simplified in comparison with those of the state of the art. The comparatively low pressing temperatures in conjunction
REFERENCES:
patent: 3700513 (1972-10-01), Haberhauer
patent: 4132331 (1979-01-01), Magerle
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