Methods for modifying the surfaces of a solid and microstructured surfaces with encreased adherence produced with said methods

A method for increasing the adhesive power of an object, comprising the step of:

• forming a multitude of projections on a surface of the object, each projection comprising a foot part and a head part, wherein the head part comprises a front surface which faces away from the surface, and the front surfaces of substantially all of the head parts have the same vertical height above the surface, and form an adherent contact surface which is interrupted by a mutual spacing between the front surfaces,
• wherein the projections are elastic and inclined in relation to the surface, the projections comprising a material whose modulus of elasticity is reduced in at least one of a longitudinal direction of each projection from the foot part to the head part, and a transverse direction of each projection taken axially from the middle of the foot part to the outside.

A method for increasing the adhesive power of an object, comprising the step of:

• forming a multitude of projections on a surface of the object, each projection comprising a foot part and a head part, wherein the head part comprises a front surface which faces away from the surface, and the front surfaces of substantially all of the head parts have the same vertical height above the surface, and form an adherent contact surface which is interrupted by a mutual spacing between the front surfaces,
• wherein the projections have a density per unit area (N), a modulus of elasticity (E), 3 0 a length (a) and a thickness (b), such that the projections are elastic and inclined in relation to the surface, the material being selected so that the value of an effective modulus of elasticity (E*) of the projections is from about 20 kPa to 10 MPa, where E*=E·N·b2·(b/a)2.

A structured surface of a solid having increased adhesive power, said surface comprising:

• a structure having a multitude of projections, each projection having a foot part and a head part;
• wherein the head part has a front surface which faces away from the surface, and the projections are elastic and inclined in relation to the surface, and comprise a material whose modulus of elasticity is reduced in at least one of a longitudinal direction of each projection from the foot part to the head part, and a transverse direction of each projection taken axially from the middle of the foot part to the outside.

A structured surface of a solid body having increased adhesive power, said surface comprising:

• a multitude of projections each comprising a foot part and a head part;
• wherein the head part comprises a front surface which faces away from the surface, and the projections have a density per unit area (N), a modulus of elasticity (E), a length (a) and a thickness (b), so as to be elastic and inclined in relation to the surface, the projections further comprising a material whose effective modulus of elas- ticity (E*) is from 20 kPa to 10 MPa, where E*=E·N·b2·(b/a)2.