Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having a component wherein a constituent is liquid...
Patent
1995-09-11
1997-11-11
Choi, Kathleen
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having a component wherein a constituent is liquid...
4283044, 4283105, 4283135, C09K 310
Patent
active
056861745
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a joint-sealing strip made of soft foam material, with an impregnation leading to delayed recovery.
2. The Prior Art
Such joint-sealing strips have become known in the prior art with various designs. First of all, reference is made, for example to French patent No. 1 544 724. In addition there is the German patent 1 000 946. Furthermore, such sealing strips have become known with various other designs as well, whereby reference is made in this regard to, for example EP-A-3 229 951, and to EP-A-2 323 589.
In order to obtain different properties for such a joint-sealing strip, but over the height of the joint-sealing strip, it has been proposed also in EP-A-1 317 833 to combine different foam materials, namely a foam material that can be impregnated with an impregnating medium, and a foam material that can not be impregnated with an impregnating medium.
Based on the above prior art, a problem is seen with respect to the invention in further developing a joint-sealing strip of the known type in such a way that an advantageous design is obtained especially under the aspect of technical handling, combined with a simple structure.
SUMMARY OF THE INVENTION
This problem is solved by the invention, whereby the objective is to obtain an impregnation that differs over the width of the joint-sealing strip, namely with a marginal longitudinal area. It is also an objective to obtain a strengthened impregnation preferably extending over the entire thickness of such marginal longitudinal area, in a way such that upon release of the recovery, a profile is obtained that rises toward the longitudinal center axis of the joint-sealing strip. It has been found that such an impregnation of the joint-sealing strip leads to an advantageous geometry of the joint-sealing strip before a compression is cancelled, for example by unwinding from a coil, and prior to the installation. This construction is significant, first of all, in connection with a conventional joint-sealing strip consisting of open-celled foam material and being impregnated for delayed recovery, as it is known from the literature specified above. In the present case, one marginal longitudinal area, or also both marginal longitudinal areas can be additionally strengthening, or preferably impregnated with a second impregnating medium, as described in greater detail in the following. Due to such additional strengthened or special impregnation, the foam material of the joint-sealing strip recovers in said area with delay also versus the center zone of the joint-sealing strip which, per, is already impregnated for delayed recovery. Basically, such delays readily may be in the range of 8, 16 or more hours (this is dependent also upon the ambient conditions such as the temperature, the humidity etc.). Furthermore, it is preferred that an impregnation particularly with the special impregnating medium specified in detail in the following, is carried out in one (or both) marginal longitudinal areas. Owing to the fact that the joint-sealing strip of this version is not impregnated elsewhere, the foam material of the joint-sealing strip consequently recovers there (i.e., in the center zone) directly and spontaneously upon release of the recovery. Consequently, such different recovery over the width of the joint-sealing strip also leads with said version to the geometric shape of a profile that rises toward the longitudinal center line of the joint-sealing strip. The foam material of the joint-sealing strip is, in this connection, selected uniformly: the impregnated marginal longitudinal area of the joint-sealing strip is formed by the same foam material as the unimpregnated area of the joint-sealing strip. Overall, the joint-sealing strip is formed by one integral strip of foam material. Furthermore, it is preferred also that an initial compression amounts to only about one third part up to half on the starting thickness of the foam material. This makes it possible also to use a foam material that
REFERENCES:
patent: 4401716 (1983-08-01), Tschudin-Mahrer
patent: 4977018 (1990-12-01), Irrgeher et al.
patent: 4996092 (1991-02-01), Francis et al.
Choi Kathleen
Illbruck GmbH
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