Molding strip and improved formation

A molding device configured to form a retaining device comprising a base provided with one or more of a plurality of retaining elements and preforms of retaining elements, the molding device comprising:

• a molding strip formed of a first material and adapted to be mounted on a support, the molding strip extending along a machine direction, having a width defined along a transverse direction perpendicular to the machine direction, and a thickness measured along a direction perpendicular to the machine direction and to the transverse direction, the molding strip having an inner face and an outer face, and the molding strip comprising a plurality of cavities, wherein part of the cavities are at least partially obturated with a plugging material, so as to define among the plurality of cavities:
• molding cavities configured to form one or more of a plurality of retaining elements and preforms of retaining elements, and
• non-functional cavities,
• wherein the plugging material is at least partly arranged in cavities among the plurality of cavities to define the non-functional cavities, the plugging material arranged between the inner face and the outer face of the molding strip has a shape complementary to at least a part of an internal volume of the cavity within which the plugging material is arranged, and
• wherein the first material is a metal material or a composite thereof.