APC is dedicated to manufacturing closures that meet our high quality standards and perform well in the field.
Liquid Flow Rate
When liquid is poured from a pail, glugging, splashing and slow flow are common complaints. A smooth, controlled pour will increase user safety when dispensing chemicals, minimize valuable product loss and eliminate the need for clean-up labour. APC’s anti-glug (AG) closures and APC-6 plug vent were designed to dampen liquid pulsing and increase product flow. Our Pail Closure Flow Rates graph shows the performance you can expect from APC closures.
(blue line on Flow Rates chart)
Pail closures such as the APC-2 (without controls) can exhibit glugging or pulsing as liquid exits the pail through the small diameter of the closure neck. This occurs because:
Lower air pressure builds inside the pail due to the liquid outflow
Higher air pressure outside the pail pushes against the liquid outflow, until air enters the pail in a large pulse
(green line on Flow Rates chart)
APC anti-glug closures (APC-2-AG and APC-2-AG-MV) smooth liquid flow by restricting liquid outflow and allowing steady air inflow through the spout neck as follows:
AG tabs fold in to limit the liquid outflow to about 90% of the closure neck diameter
Air inflows continuously above the liquid outflow and forms bubbles beside the pail cover
Air bubbles float up through the liquid at a speed that depends on the liquid viscosity
Bubbles rise most quickly in liquids with a viscosity close to water (e.g., janitorial chemicals) making AG closures the most effective choice for these products
(red line on Flow Rates chart)
APC-6 plug vents are mounted on the pail cover opposite the main closure. The separate air vent is opened to equalize air pressure inside the pail and ensure a smooth, fast flow.
Plug vent introduces air above the liquid level which increases liquid outflow
APC-6 vents are effective for liquids with higher viscosities (e.g., petroleum lubricants) making plug vents the most effective choice for these products
Since APC began production in 1997, we have had a track record of manufacturing high quality pail closures. Our products are manufactured and inspected under a detailed quality management system to ensure that all closures conform to our high standards:
Our contract molder Revere Plastics Systems is registered under both quality management system ISO 9001:2008 and ISO/TS 16949:2009
Our experienced operators, inspectors and state of the art assembly machines minimize non-conformances
We use only FDA approved virgin resins made in the USA. Resin Product Stewardship Bulletins are available upon request