Mesh hook surface fastener, production method therefor, and production method for surface fastener-attached molded body

A production method for a mesh hook surface fastener, the method comprising:

• charging a molding material into an extruder including an extrusion nozzle, and extruding a tape-shaped object from the extrusion nozzle, the extrusion nozzle having:
• a laterally long slit having a predetermined width in a direction orthogonal to an extrusion direction,
• upward protruding space portions extending upward from the laterally long slit and arranged at predetermined intervals in a width direction of the laterally long slit, and
• downward protruding space portions extending downward from the laterally long slit and arranged at intervals in the width direction of the laterally long slit, with adjacent downward protruding space portions having a different amount of downward protrusion from the laterally long slit;
• making incisions at predetermined intervals in the extrusion direction, the incisions each extending in a direction intersecting with the extrusion direction and each being made from tops of portions extruded from the upward protruding space portions up to a portion extruded from the laterally long slit;
• and
• drawing the tape-shaped object in the extrusion direction, thereby making the portion extruded from the laterally long slit into a base layer in which strands are arranged in parallel, making the portions extruded from the upward protruding space portions into hook-shaped engagement elements protruding from a first surface of the base layer, and making portions extruded from the downward protruding space portions into shape holding ribs protruding from a second surface of the base layer, with adjacent shape holding ribs being different in protrusion height from the second surface of the base layer.