The flip top closure is a one piece cap with a body and a lid connected by a hinge. The hinge allows the lid to be closed onto the body of the flip top cap which normally has some kind of finger recess enabling the user to open the cap more easily and conveniently.
On the newer versions of flip top caps, the lid also has a slight overhang creating an even larger surface for the flip top cap to be opened. When opened the liquid product flows through the orifice of the flip top cap when the bottle underneath is squeezed.
The lid features a pin which closes the orifice of the cap. The diameter of the pin is slightly bigger than the orifice which prevents the lid from being opened be accident. The opening force of flip top closures have particular ranges related to the resin and colourants used in their production.
The flip top caps have orifices with a variety of diameters ranging from 1 up to 10mm as there are lots of products with different viscosities which need to be dispensed.
At the rear of the flip top cap, the body and the lid are connected by the hinge. The hinge is one of the most critical parts of the flip top closure as this should perform like an active function. Users have only to move the lid very slightly before the hinge starts forcing the lid back onto the body of the cap. There are different styles available like a butterfly or dual axis hinges to meet every market need.
The threaded version of the flip top caps are geared to the industry SPI or GCMI standards like 20-410, 24-410 and 28-410; other diameters like 15 and 18mm are also available based on the DIN norm.