Boehringer Mannheim Gmbh

Klaus Dieter Hungenberg

Heinz Kurt Macho

Norbert Becker

Two absorbent layer materials for a sample liquid are connected with one another in such a way that the sample liquid can pass through from one layer into the other layer through the connecting surface between the layers a hot melt adhesive is applied to the first layer material in the form of a discontinuous coating and the second layer material is pressed on while the melt adhesive is still sufficiently hot. The amount of the melt adhesive and the pressing-on force are adjusted to one another with regard to the surface properties in such a manner that, even after the application and pressing on of the second layer material, a continuous liquid-permeable melt adhesive layer does not result. The diagnostic test carrier for the investigation of a sample liquid has two absorbent layers arranged over one another so that the sample liquid can pass through the connecting surface between the layers from one layer into the other, wherein the absorbent layers are connected with one another by a discontinuous liquid-permeable melt adhesive layer.

Process for the preparation of a diagnostic test carrier and the carrier

At least two layers are fixed together at a distance so that a gap is present between them, wherein the layers are connected with one another by a plurality of discrete melt adhesive regions, intermediate spaces being present between the melt adhesive regions so that a liquid transport in the gap between the layers is assured through the intermediate spaces. To produce this test carrier, the melt adhesive in the form of discrete regions, between which intermediate spaces are present, is applied to a first layer material in a thickness which is greater than the desired gap and a second layer material is pressed against the melt adhesive regions while the melt adhesive is still sufficiently hot in order to be bindable in such a manner that it binds with the melt adhesive but a gap remains between the layer materials.

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Birkenau-Hornbach, Germany

Klaus Dieter Hungenberg