Stock material or miscellaneous articles – Structurally defined web or sheet – Honeycomb-like
Patent
1993-10-05
1995-02-07
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Honeycomb-like
73 492, 139384R, 139410, 139420C, 139420R, 156 71, 156292, 156293, 1563073, 220454, 428224, 428225, 428251, 428257, 428902, B32B 312
Patent
active
053874552
DESCRIPTION:
BRIEF SUMMARY
The present invention relates first of all to a structural part consisting of a cured resinified spaced-layer fabric formed of a ductile fiber such as glass fiber, aramid fiber or the like, having a first layer and a second layer which are liquid-tight and are spaced from each other by cross-pieces.
Such a structural part is known, for instance from the European Patent Application 88 110 601.7. In addition to this, reference should also be had to U.S. Pat. No. 3,481,427.
In particular, the structural part known from the European Patent Application has proven its worth in many respects in practice. Thus, linings are also effected of hollow bodies, for instance tanks which are to be restored. Particularly in the case of tank farms, the safety requirements, however, are very high. On the one hand, the lining material must be resistant to the liquids stored in the tanks, for instance gasoline, and, on the other hand, easy inflammability or danger of explosion of such substances must be taken into account. In particular with regard to the latter requirement, a lining having a base of a spaced-layer fabric is not yet satisfactory in all respects.
Proceeding from the prior art described above, the object of the present invention is to provide a structural part based on a spaced-layer fabric which is suitable in particular also for containers for easily inflammable and explosion-endangered substances such as, for instance, gasoline.
This object is solved by the invention set forth in claim 1. It is directed at the fact that conductive threads which are incorporated in the spaced-layer fabric extend alternately between the layers. These conductive threads, for instance carbon threads, connect the two layers dependably in electrically conductive manner with each other. This means that any electrostatic charge of the container which may be present is discharged to the surface of the uppermost layer of fabric. By suitable measures it can thus be assured that practically no potential difference to ground is present. This measure surprisingly makes linings having a base of spaced-layer fabric also suitable for easily inflammable or explosive substances such as gasoline, for instance. As a further development, it is provided that the layers of the spaced-layer fabric are transparent of translucent in resinified state. This transparency first of all makes possible a simple verification as to whether the desired spacing of the lining is actually also fully established. Regions in which the spacing has not been established are differently colored, namely darker. Between the two layers a hollow space is formed which is passed through solely by the cross-pieces which connect the two layers together. If the inner layer facing the liquid or a tank wall has a leak for instance, liquid penetrates into the hollow space between the two layers, and this is recorded by a monitoring device.
The invention also relates to a method for developing a lagging, preferably an inner covering of a hollow body such as, in particular, a tank, this inner covering making the monitoring of leaks possible and can be used at the same time in the case of substances which are subject to fire or explosion. In this connection, the invention proposes the application of a conductive resin composition onto a container wall. By this resin composition, an electrically conductive spaced-layer fabric which is transparent or translucent after impregnation with resin and hardening of the resin is attached to the wall of the container. The lamination resin used for the impregnation of the spaced-layer fabric is preferably not made conductive by graphite or carbon fibers, in order to retain the transparency of the spaced-layer fabric laminate. Only in this way is its possibly visually to check the function of the hollow space before the application of further conductive layers. The resin composition first applied to the container wall can, in particular, also exhibit strong colorability, for instance be a bright red. This in order to utilize transparency of the fabr
REFERENCES:
patent: 3481427 (1969-12-01), Dobbs et al.
patent: 4330811 (1982-05-01), Bordner
patent: 4840828 (1989-06-01), Bottger et al.
patent: 4921751 (1990-05-01), Wakahara et al.
patent: 5240533 (1993-08-01), Bottger et al.
Bell James J.
Farber Martin A.
Vorwerk & Co. Interholding GmbH
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