Molded surface fastener and manufacturing method of molded surface fastener

A manufacturing method of a molded surface fastener having a base portion in a thin plate shape, right and left outer wall portions standing on an upper surface of the base portion along a length direction, and a plurality of engaging elements disposed between the right and left outer wall portions, using a molding apparatus having a die wheel rotating in one direction, and an extrusion nozzle discharging first synthetic resin and second synthetic resin which contains magnetic particles at a certain ratio in a molten state toward the die wheel,

• wherein the method including:
• discharging the first synthetic resin from a first discharging outlet of the extrusion nozzle and discharging the second synthetic resin from a second discharging outlet of the extrusion nozzle toward the die wheel,
• forming at least each upper end part of the right and left outer wall portions with the first synthetic resin only,
• molding right and left magnetic wall portions in which at least each upper end part is formed of the second synthetic resin only and each of which is disposed along the length direction at a position in a width direction between one of the outer wall portions and the engaging elements on the upper surface of the base portion, and
• molding grooved channel portions on the upper surface of the base portion, and disposed between each of the outer wall portions and each of the magnetic wall portions, and between the engaging elements and each of the magnetic wall portions.