Maybe you have observed the rigid circular button-like object in the center of certain pouches and versatile bags? It’s known as a 1-way degassing valve, frequently utilized on fermented food and occasional packaging. Typically made from high-density polyethylene (HDPE), the degassing valve’s purpose would be to periodically allow gas to exit out of the within the package once the internal pressure exceeds a particular (small) value. As it would seem, air cannot flow in the outdoors inwards (since it is a “one of the waysInch valve), leading to an airtight seal to help keep the interior contents fresh.

How do you use it?

Once the internal pressure is below a threshold value, the valve is shut to keep an airtight seal. When the pressure from the internal contents exceeds a specific amount, however, the valve opens to match excess pressure to bleed off. By design air cannot go into the package with the valves whether or not the outdoors pressure is slightly more than those of the interior.

Just when was it needed?

The valve was created for the coffee industry because freshly roasted espresso beans naturally produce considerable amounts of gas, composed mainly of co2 (CO2). While the quantity of CO2 created varies broadly in line with the kind of coffee, a dark roast can establish up to 5 liters of gas per pound of beans! Bleeding from the CO2 to can’t be done at the fee for oxidation, however. Since coffee grounds naturally contain a mix of various oils, acids, along with other chemical substances-with each other known as coffee solubles-they’re susceptible to attack by oxygen (O2) ingress in to the package. Much like how iron rusts in air, oxygen molecules can interact with delicate coffee solubles to literally remove aromatic flavors in the coffee. Steps to avoid oxidation and subsequent staling from the coffee include making certain sufficient barrier characteristics from the package to ensure that oxygen transmission rates (OTRs) are in acceptable levels. Together, a 1-way degassing valve may prevent over-pressurization from the package without compromising integrity from the bag.

Additionally to coffee, one-way valves happen to be utilized on bags for packaging commercial dog food, fertilizer, raw materials, and niche pharmaceutical products.

Options that come with the main one-way valve range from the primary body (made from HDPE), a little filter to avoid small particles from clogging the airways, as well as an internal rubber disc that attaches towards the body utilizing a layer of oil to produce that oxygen-proof seal.

Speak to your reliable flexible packaging partner right now to decide if your products can usually benefit from adding a 1-way degassing valve. Of course, don’t hesitate to achieve out in case you have any comments or queries about anything flexible packaging.