Snap fastener with tape, and manufacturing method and mold of the same

A male member of a snap fastener with tape comprising a male button made of synthetic resin which is integrally molded on front and back faces of the tape over a peripheral edge of an attachment hole of the tape having at least one attachment hole and has an engaging portion to be engaged with a female button at a substantially center portion of the male button, wherein the male button has at least one mold hole extending in a front and back direction of the tape, at least one portion of the tape extends to an inside of the male button across the mold hole, the engaging portion has a neck portion standing from a center of a substrate closing the attachment hole and an engaging head continuous to an upper end of the neck portion, a recess having a bottom face in substantially the same plane as a plane including the attachment hole is formed on a surface of the substrate on an opposite side to the engaging portion, at least one wedge-shaped projecting rib extends from a projecting portion projecting from a center of the bottom face of the recess to reach substantially an outer periphery of the bottom face of the recess, a projecting end face of the projecting portion at the center of the bottom face of the recess is within the recess, and a sub runner fracture burr is formed on the projecting end face.

A manufacturing method of a snap fastener with tape for integrally molding a male or female button made of synthetic resin on front and back faces of tape such that the male or female button holds a peripheral edge of an attachment hole of the tape having at least one attachment hole, comprising the steps of fixing the tape with the attachment hole in position between cavities of a fixed mold and a movable mold, closing the movable mold and clamping a tape portion of the peripheral edge of the attachment hole by at least a pair of clamping members projecting to face each other in the cavities of the molds, forming an introducing passage for introducing molten resin through a center portion of the attachment hole of the tape and at least one molten resin guide passage for supplying the molten resin radially or linearly from the introducing passage as a center toward the peripheral edge of the attachment hole, and injecting the molten resin into the cavity through the molten resin guide passage toward the peripheral edge of the attachment hole of the tape.

A mold of a snap fastener with tape for molding a male or female button made of synthetic resin integrally with front and back faces of tape such that the male or female button holds a peripheral edge of an attachment hole of the tape having at least one attachment hole, comprising a first mold, a second mold, a tape inserting passage formed in the mold, at least one snap fastener molding cavity formed in the tape inserting passage, at least one pair of clamping members projecting from such positions in the cavity that the clamping members can clamp the peripheral edge of the attachment hole of the tape and facing each other with a distance for clamping the tape kept therebetween, an introducing passage for introducing molten resin from a center portion of the attachment hole of the tape, and at least one molten resin guide passage formed to extend radially or linearly from the introducing passage as a center toward the peripheral edge of the attachment hole.