Surface Fastener

Abstract

In a surface fastener in plan view seen from above the engaging elements, when an area of an engaging head portion of one of the engaging elements is defined as a head portion area, the head portion area of each of the engaging elements is 22000 μm 2 or greater and 50000 μm 2 or less. According to the surface fastener, it is possible to obtain a large peel strength with respect to a female surface fastener.

1 . A surface fastener made of synthetic resin and comprising: a thin-plate-shaped base portion and a plurality of engaging elements provided on the base portion, each of the engaging elements including a stem portion that protrudes upward from the base portion, and an engaging head portion that is formed on an upper end portion of the stem portion,
 wherein, in plan view seen from above the engaging elements, when an area of the engaging head portion of one of the engaging elements is defined as a head portion area, the head portion area of each of the engaging elements is 22000 μm 2  or greater and 50000 μm 2  or less.   
     
     
         2 . The surface fastener according to  claim 1 ,
 wherein a plurality of element rows in which the plurality of engaging elements are arrayed along a first direction are provided,   wherein, when a distance between the engaging head portions of the engaging elements that are adjacent to each other in the first direction is defined as a first head-portion-to-head-portion distance and a distance between the engaging head portions of the element rows that are adjacent to each other in a second direction orthogonal to the first direction is defined as a second head-portion-to-head-portion distance, at least one of the first head-portion-to-head-portion distance and the second head-portion-to-head-portion distance is 200 μm or greater, and the first head-portion-to-head-portion distance and the second head-portion-to-head-portion distance are 430 μm or less, and   wherein the head portion area of each of the engaging elements is 41000 μm 2  or less.   
     
     
         3 . The surface fastener according to  claim 2 ,
 wherein an arrangement of the engaging elements includes a parallel arrangement in which the engaging elements of each of the element rows are arrayed at a fixed first pitch along the first direction, the plurality of element rows are arrayed at a fixed second pitch along the second direction, and the engaging elements are arrayed along the second direction in two of the element rows that are adjacent to each other in the second direction,   wherein, in the engaging elements, when a direction that is orthogonal to a height direction of the engaging elements is defined as a horizontal direction, a dimension of each of boundary portions in the horizontal direction is 127 μm or greater, each of the boundary portions being provided between the stem portion corresponding thereto and the engaging head portion corresponding thereto, and   wherein the head portion area of each of the engaging elements is 38000 μm 2  or less.   
     
     
         4 . The surface fastener according to  claim 2 ,
 wherein the plurality of engaging elements are arrayed at a fixed first pitch along the first direction,   wherein the plurality of element rows are arrayed at a fixed second pitch along the second direction,   wherein the first pitch and the second pitch are substantially equal to each other,   wherein, in the engaging elements, when a direction that is orthogonal to a height direction of the engaging elements is defined as a horizontal direction, a dimension of each of boundary portions in the horizontal direction is 127 μm or greater, each of the boundary portions being provided between the stem portion corresponding thereto and the engaging head portion corresponding thereto,   wherein the head portion area of each of the engaging elements is 38000 μm 2  or less, and   wherein a maximum value of a dimension in the second direction of each of the engaging head portions in the plan view is 223 μm or less.   
     
     
         5 . The surface fastener according to  claim 1 ,
 wherein at least one pawl portion is provided in a protruding manner on an outer peripheral edge portion of each of the engaging head portions, and   wherein the at least one pawl portion has a pawl width that is smaller than a dimension of a boundary portion in a direction orthogonal to the height direction, the boundary portion being provided between the stem portion corresponding thereto and the engaging head portion corresponding thereto.   
     
     
         6 . The surface fastener according to  claim 5 ,
 wherein, when the engaging elements are seen in a direction orthogonal to a height direction of the engaging elements, the at least one pawl portion has a pawl upper surface that faces upward and a pawl lower surface that is disposed on a side opposite to the pawl upper surface, and the pawl lower surface has a drooping form in which a tip end portion of the pawl lower surface is disposed lower than a base end portion of the pawl lower surface in the height direction.