Now in use on Line 4 at RxPak is a new CR closure concept called the One Piece Squeeze-Lok® Low-Profile Child-Resistant Closure, or SQL-LP. It was developed jointly by closure maker Rexam (Evansville, IN) and bottle supplier Setco (Anaheim, CA). RxPak is among the first to use it commercially.
Injection molded of polypropylene, the one-piece SQL-LP is double-shelled. Molded into the inside wall of the outer shell are two “loks” that match two more “loks” in the neck finish of the injection blow-molded high-density polyethylene bottle. These interlocking features prevent the cap from rotating unless opposing finger pads on the skirt of the outside shell are pressed. Pressing the finger pads causes the outer shell to deform from a circle to an oval, thus disengaging the “loks” and allowing the cap to be easily removed. The idea is to defeat inquisitive children, yet provide ease of opening for adults, especially seniors. According to Rexam and Setco, seniors liked the closure concept in focus studies because it’s easily squeezed open.
