The invention relates to an adhesive film comprising a fleece carrier (T) and two layers made of heat activated adhesive compounds (1, 2) arranged on both sides of the fleece carrier, characterized in that both adhesive compounds (1, 2) are permeated in the fleece carrier (permeation regions T1 and T2) such that a total of between 20% and 92% of the fiber intermediate volume of the fleece carrier (T) is saturated by the adhesive compound, providing that the adhesive compounds (T1, T2) permeated on both sides of the fleece carrier (T1, T2) each make up at least 10% of the fiber intermediate volume of the fleece carrier (T) in the composition.