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Apparatus and Method for Forming Retaining Elements by Forming:

U.S. Patent No. 11,426,905

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By: Tara Olivo

Associate Editor at Nonwovens Industry, Rodman Media

Damien Bosser, Le Cellier, France; and Anthony Mahe, Le Cellier, France.
Assigned to Aplix, Le Cellier.

Filed: 4/28/17
Issued: 8/30/22

A method of forming a retaining device with hooks, wherein: a molding strip is provided that presents an inside face and an outside face, and that has a plurality of cavities, each cavity defining a stem extending from the outside face towards the inside face and including an end forming a head that extends from the stem towards the inside face of the molding strip; the molding strip is positioned on rotary drive means comprising at least one roller, the inside face of the molding strip being arranged to bear against the drive means; molding material is dispensed against the outside face of the molding strip by material dispenser means comprising injection or extrusion nozzles arranged facing the molding strip in such a manner as to define a gap between the material dispenser means and the molding strip, the step of dispensing the molding material being performed in such a manner as to fill said gap and the cavities with molding material so as to form a tape comprising a base of thickness that is defined by the gap, and first preforms projecting from said base each comprising a stem and a head, the first preforms being formed by the molding material in the cavities of the molding strip; the tape is unmolded; and the unmolded tape is inserted in a forming device so as to modify the shapes of the heads of the preforms by forming, wherein the forming device comprises a drive roller which carries the tape at a drive speed, and at least two rotary elements that perform a forming action so as to modify the shapes of the heads of the preforms by forming, each of said rotary elements having a speed that is different from the drive speed of the tape, a first rotary element of the at least two rotary elements having a speed that is greater than the drive speed of the tape and a second rotary element of the at least two rotary elements having a speed that is less than the drive speed of the tape.

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