Molded surface fastener

1. A molded surface fastener made of synthetic resin in which a plurality of male engaging elements are standing on an upper surface of a flat plate-shaped base portion and each engaging element has a stem portion standing on the base portion and an engaging head portion bulging from an upper end of the stem portion toward an outside and formed integrally on the stem portion, wherein:

the engaging head portion has a top end surface of head portion, a back surface of head portion, and a curved outer peripheral side surface, wherein the back surface of head portion extends from a boundary between the stem portion and the engaging head portion towards the outside and is opposite the top end surface of head portion, and the curved outer peripheral side surface is disposed from an outer periphery of the top end surface of head portion to the back surface of head portion,

in at least a part of the engaging elements, at least one pawl portion having a pawl width dimension narrower than a width dimension at the boundary between the stem portion and the engaging head portion is protruded on an outer peripheral edge part of the engaging head portion,

the at least one pawl portion protrudes from a part of the curved outer peripheral side surface of the engaging head portion toward the outside, and

the at least one pawl portion has a back surface of pawl formed at a different angle than the back surface of head portion.

2. The molded surface fastener according to claim 1 , wherein the pawl portion is formed to slope or curve downward toward the base portion.

3. The molded surface fastener according to claim 1 , wherein a plurality of the pawl portions are provided with respect to the engaging head portion of one of the male engaging elements.

4. The molded surface fastener according to claim 3 , wherein a plurality of the pawl portions are disposed on the engaging head portion regularly.

5. The molded surface fastener according to claim 3 , wherein a plurality of the pawl portions are disposed on the engaging head portion irregularly.

6. The molded surface fastener according to claim 3 , wherein a plurality of the pawl portions are formed at different angles respectively.

7. The molded surface fastener according to claim 3 , wherein a plurality of the pawl portions are formed with different sizes respectively.

8. The molded surface fastener according to claim 1 , wherein an upper surface of pawl and the back surface of pawl of the pawl portion are formed to be a sloped surface or a curved surface declining toward a tip end.

9. The molded surface fastener according to claim 1 , wherein the engaging head portion has a shape similar to a cross section at the boundary in a plan view.

10. The molded surface fastener according to claim 1 , wherein the engaging head portion has a shape of a circle in a plan view.

11. The molded surface fastener according to claim 1 , wherein a base end part of the pawl portion has a pawl width dimension narrower than one third size of the width dimension of the boundary.

12. The molded surface fastener according to claim 1 , wherein:

a height dimension from the upper surface of the base portion to the top end surface of head portion in the engaging element is set to be 0.05 mm or more and 1.5 mm or less,

a width dimension at the boundary is set to be 0.1 mm or more and 0.5 mm or less,

a bulging length from the boundary to the outer peripheral edge part of the engaging head portion is set to be 0.01 mm or more and 0.2 mm or less, and

a pawl width dimension in the base end part of the pawl portion is set to be 0.01 mm or more and 0.1 mm or less.