Binding element in the form of a U-shaped profile (2) made of a heat-conducting material, which U-shaped profile (2) consists of a back wall (3) and two standing side walls (4), such that a space (5) is enclosed whereby, in the above-mentioned space (5), on the above-mentioned back wall (3) is provided a layer of glue (6) which melts under the influence of heat, and whereby on at least one of the above-mentioned side walls (4) is provided an end leaf (8), characterized in that in the above-mentioned space (5), at least on the side wall (4) onto which the above-mentioned end leaf (8) is provided, is also provided a layer of glue (7) which melts under the influence of heat.
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