Molded surface fastener manufacturing method
AssigneeYKK Corporation
InventorsYoshiyuki Fukuhara, Hiroyuki Yamashita, Makoto Takekawa, Takahiro Fuse
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Abstract
In this molded surface fastener, an engaging element includes a columnar stem portion, and micro pawl portions protruding outward from an upper end outer peripheral edge of the stem portion in a plan view of the engaging elements. A pawl width dimension of the micro pawl portions is smaller than a line segment connecting two points on the upper end outer peripheral edge of the stem portion. The micro pawl portions protrude toward a base portion. This molded surface fastener has a high peel strength and a shear strength with respect to a female surface fastener.
Claims2
A manufacturing method of a molded surface fastener made of synthetic resin in which a plurality of engaging elements stand on an upper surface of a flat plate-shaped base portion, the manufacturing method including a primary molding step for molding a primary molded body comprising the base portion and a plurality of provisional elements standing on the base portion and a secondary molding step for molding the molded surface fastener by heating at least a part of the provisional elements of the primary molded body and compressing them from above, wherein
- the manufacturing method including:
- in the primary molding step, molding the primary molded body in which each of the provisional elements comprises a columnar stem portion standing on the base portion, a rib portion protruding on an upper surface of the stem portion, and at least two protruded portions protruding from the rib portion toward an outside of an upper end outer peripheral edge of the stem portion along a direction crossing with respect to a standing direction of the stem portion, and in which the upper surface of the stem portion excluding the part provided with the rib portion is exposed upward;
- and
- in the secondary molding step, forming the engaging element which comprises a stem portion and micro pawl portions protruding from an outer peripheral side surface of the stem portion toward the base portion and is capable of engaging loops of a female surface fastener only with the micro pawl portions by compressing at least a part of the protruded portions and the rib portion of the primary molded body from above.
Dependencies are inferred from the claim text.