Improved retention device

Abstract

Retaining device ( 1 ) comprising a base ( 10 ), a plurality of retaining elements ( 20 ) comprising a rod ( 30 ) surmounted by a head ( 40 ); in which, for each retaining element ( 20 ), in projection in a plane formed by the upper face ( 12 ) of the base ( 10 ), the lower end ( 34 ) of the rod ( 30 ) is inscribed within a first circle C 1 with center O 1 , the head ( 40 ) is inscribed within a second circle C 2 with center O 2 , said second circle being tangent to one end of the head ( 40 ) along the longitudinal direction (MD), the maximum dimension of the head ( 40 ) passing through the center of the circle C 2 and extending along the longitudinal direction (MD) and/or the transverse direction (CD) is less than 80% of the diameter D 2 of the second circle C 2.

1 . A retaining device comprising:
 a base extending along a longitudinal direction, having an upper face and a lower face,   a plurality of retaining elements extending on the upper face of the base, each retaining element comprising a rod surmounted by a head; each rod comprising a lower end connected to the base, and an opposite upper end from which the head extends,   wherein, for each retaining element, in projection in a plane formed by the upper face of the base:   the lower end of the rod is inscribed within a first circle C 1  with center O 1 , the head is inscribed within a second circle C 2  with center O 2  and diameter D 2 , said second circle being the smallest circle comprising the head, which second circle C 2  being tangent to one end of the head along the longitudinal direction and/or the transverse direction,   such that:   the maximum dimension of the head passing through the center O 2  of the circle C 2  and extending along the longitudinal direction and/or the transverse direction is less than 80% of the diameter D 2  of the second circle C 2 .   
     
     
         2 . The retaining device according to  claim 1 , wherein the second circle C 2  is comprised in the first circle C 1 . 
     
     
         3 . The retaining device according to any of  claim 1 , wherein, the first circle C 1  having a diameter D 1 , the distance between O 1  and O 2  is less than or equal to 50% of the diameter D 1  of the first circle C 1 , in particular less than 30%, less than 25%, less than 20%, less than 15%, or less than 10%, and optionally, the distance between O 1  and O 2  is greater than or equal to 0% of the diameter D 1  of the first circle C 1 , or greater than 0%, or greater than 1%, or greater than 4%. 
     
     
         4 . The retaining device according to  claim 1 , wherein the distance between O 1  and O 2  is less than or equal to 50% of the diameter D 2  of the second circle C 2 , in particular less than 30%, less than 25%, less than 20%, less than 15%, less than 12%, or less than 10% and optionally, the distance between O 1  and O 2  is greater than or equal to 0% of the diameter D 2  of the second circle C 2 , or greater than 0%, or greater than 1%, or greater than 4%. 
     
     
         5 . The retaining device according to  claim 1 , wherein the distance between O 1  and O 2  is less than or equal to 100 μm, in particular less than or equal to 75 μm, less than or equal to 50 μm or less than or equal to 30 μm. 
     
     
         6 . The retaining device according to  claim 1 , wherein the upper end of the rod is inscribed within a third circle C 3 , said circle C 3  being comprised in the second circle C 2 . 
     
     
         7 . The retaining device according to  claim 1 , wherein a non-woven material is secured to the lower face of the base. 
     
     
         8 . The retaining device according to  claim 1 , wherein the ratio of the diameter D 2  of the circle C 2  and the diameter D 1  of the circle C 1  is comprised between 0.3 and 0.95 or more specifically between 0.5 and 0.9. 
     
     
         9 . The retaining device according to  claim 1 , wherein the retaining elements have a hooking height comprised between 30 micrometers and 120 micrometers, more particularly between 30 micrometers and 70 micrometers, even more particularly between 40 micrometers and 60 micrometers. 
     
     
         10 . The retaining device according to  claim 1 , wherein the head has a thickness comprised between 30 micrometers and 70 micrometers, particularly 40 micrometers and 60 micrometers. 
     
     
         11 . The retaining device according to  claim 1 , wherein the rod has a height which is comprised between 150 micrometers and 330 micrometers, particularly between 200 micrometers and 300 micrometers. 
     
     
         12 . The retaining device according to  claim 1 , wherein the ratio of the thickness of the head and the height of the rod is comprised between 0.05 and 0.3, or more particularly between 0.1 and 0.25. 
     
     
         13 . The retaining device according to  claim 1 , wherein the ratio of the hooking height and the height of the rod is comprised between 0.05 and 0.4, particularly between 0.05 and 0.3, more particularly between 0.1 and 0.25. 
     
     
         14 . The retaining device according to  claim 1 , wherein the rod has, in side view along the longitudinal direction and/or the transverse direction, a proximal portion extending from the lower end, a distal portion extending from the upper end and an intermediate portion arranged between the proximal portion and the distal portion, the distal portion and the proximal portion have, with respect to a straight line perpendicular to the longitudinal direction and to the transverse direction, a curvature greater than the curvature of the intermediate portion. 
     
     
         15 . The retaining device according to  claim 14 , wherein, in side view along the longitudinal direction and/or the transverse direction in a view projected in the plane perpendicular to this side view, the rod has two opposite edges of which at least one, in some cases both edges, has a general shape of a tilde or an inverted tilde, or a shape of an S or an inverted S. 
     
     
         16 . The retaining device according to  claim 1 , wherein, in side view along the longitudinal direction and/or the transverse direction, said retaining device has a ratio between the dimension of the upper end of the rod and the dimension of the lower end of the rod comprised between 0.3 and 0.75, or particularly between 0.3 and 0.65, or more particularly between 0.35 and 0.55, or even more particularly between 0.35 and 0.5.