Problems addressed: Oxygen-sensitive products, dispenses requiring atomization of product, dispenses requiring suck back for cosmetic purposes. Contraindications: N/A, except for lack of necessity Description: Co-axial (co-ax) needles surround the fluid column sent forth from the filler needle with a column of inert gas, usually nitrogen, in order to shield an oxygen-sensitive product from contact with room air. Often, there is another needle that will first purge the container of room air before the dispense takes place, followed by a final needle that fills the headspace on top of the product with more inert gas. The container is then stoppered and capped, devoid of room air, significantly extending the shelf life of the product.
Occasionally, we have designed co-ax needles to fire off a droplet of product from the end of the needle, in order to atomize it or break off a small sphere. The outer "gassing" portion of the co-ax can also be used to create suction, removing all product that falls above a set point, ensuring that all containers are filled to the exact same level, mainly for aesthetic purposes.
Overlook co-ax filler needle
Overlook co-ax filler needle (separated)
OneShot co-ax filler needle
with Teflon coating
Overlook OneShot co-ax filler needle
with Teflon coating and Upchurch fitting