Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-05-24
1998-08-25
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156190, 156195, 156217, 156294, 156425, 156428, 156432, 156446, 156465, F16L 55165, B65H 8100
Patent
active
057980136
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a method of producing a tubular lining hose, in particular for use in sewer reconstruction work, comprising the steps of forming a fibrous strip into a curable, resin-impreganted hose, the inner side of the resultant lining hose being provided with a protective foil. The present invention additionally refers to an apparatus for carrying out the method according to the present invention as well as to a lining hose produced by means of this method.
German-Offenlegungsschrift 3922351 describes a winding tube seated on a protective foil, which surrounds a heating jacket, during the heat-curing process; in the case of said winding tube, the winding ends of the fibrous strip and, consequently, also the overlapping edge extend helically over the length of the winding tube. Such lining hoses are preferably introduced in defective waste pipes where they are then brought into contact with the inner surface of the damaged waste pipe by means of an expansion process. The expansion of the lining hose can be achieved by applying an internal pressure by means of air or water. In the course of this process, the overlapping areas slide on one another. When the lining hose has been expanded in the waste pipe, said lining hose, which is impreganted with resin, is cured. The type of curing depends on the resin which has been used. UV-curable and heat-curable resins proved to be particularly useful.
It is the object of the present invention to provide a method of producing a tubular lining hose of the type mentioned at the beginning with the aid of which hoses of arbitrary length can be produced in a simple manner.
In accordance with the present invention, this object is achieved by producing first a foil hose, which forms the protective foil, by helically winding a foil strip onto a winding mandrel, the fibrous strip being then wound onto said foil hose. Due to the fact that, as suggested by the method according to the present invention, arbitrary lengths of the foil hose can be produced, lining hoses for waste pipes of arbitrary dimensions can be produced, if desired also in situ, without major resetting operations and without great expenditure of work. For the sake of completeness, reference is at this point also made to the fact that, independently of the respective embodiment, the lining hose produced by this method can be expanded and cured also without having been brought into contact with a waste pipe; in this case, said lining hose can then be used as a substitute for a piping, e.g. a water pipe, a pipeline or a waste pipe.
In accordance with a preferred embodiment, the lining hose is provided with an outer foil hose which prevents possibly harmful constituents of the resin from being transferred to the environment through leakage points in the waste pipe. For this purpose, the fibrous strip formed into a hose can have applied thereto an outer foil hose by helically winding a second foil strip onto said fibrous strip, the associated lateral edges of said second foil strip being preferably arranged such that they overlap.
The lining hose can especially be produced at a comparatively high speed, when the the winding operations of the fibrous strip and of the foil strip or of the foil strips are carried out essentially simultaneously.
In accordance with an advantageous embodiment, the overlapping lateral edges of the first or second foil strip are sealingly interconnected preferably by welding or by means of an adhesive. This prevents possibly harmful constituents of the resin from being transferred to the environment.
The leakproofness and the robustness, e.g. with regard to the introduction in a sewer section, can be improved still further in the case of an embodiment where the overlapping lateral edges of the first and/or second foil strip(s) are sealingly interconnected, preferably by welding or by means of an adhesive.
A particularly simple possibility of interconnecting the edges of the inner and/or outer foil hose(s) is an adhesive tape unwound in the same direction. The adhesive ta
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Aftergut Jeff H.
Brandenburger Patentverwertungsgesellschaft des burgerlichen Rec
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