US Patent 7316052 Closure profile and die plate for extruding same

A reclosable pouch includes interlocking male and female closure elements having elongate hollow closure profiles. The male closure profile has a hollow shaft section, and the female closure profile has a channel with at least one hollow side. A set of pleated grip strips may be disposed adjacent the closure elements to aid in opening a pouch. A die plate for extruding the closure element includes an extrudate aperture that forms an intermediate closure profile including a gap between spaced apart base wall portions.