Binding element

A binding element comprising:

• a U-shaped profile for binding a bundle of leaves by inserting the bundle of leaves in the binding element and applying heat to the U-shaped profile, the U-shaped profile made of a rigid heat-conducting material, said U-shaped profile comprises a back wall and first and second standing side walls, said walls enclosing a space;
• a first layer of glue on said back wall in said space which melts under the influence of the heat applied, the binding element further comprising an end leaf fixed on the inside of at least the first side wall at a distance from said first layer of glue on the back wall;
• wherein, in said space, at least on the first side wall on which the end leaf is provided, there is also provided a second layer of glue between the first layer of glue and an edge of the end leaf, wherein the second layer of glue melts under the influence of the heat applied and wherein the second layer of glue extends from the first layer of glue towards and up to the edge of the end leaf and has a thickness that is the same as or less than a thickness of the end leaf, such that when a bundle of leaves to be bound is inserted into the space, the farthest leaves of the bundle cannot remain hanging on a top edge of the second layer of glue, and the first and second layers of glue are configured to bind the leaves of a bundle of leaves to be bound.