Small but most important thing on a coffee bag: One way valve

If you are a traditional coffee enthusiast, you must have noticed a special small device on the coffee bag. Its name is a one-way valve. Don't underestimate its small size. The most important aspect of a coffee bag maybe its functionality and importance. Especially for coffee bags containing many coffee beans, we can 100% confirm that they must contain a one-way valve.

What is the one-way valve's function?

The one-way valve coffee bags are designed for better freshness and sealing. Easy to fill and store the product. The degassing valve can also discharge carbon dioxide gas released by freshly roasted coffee within about seven days after the completion of the roasting process. In addition, it can prevent moisture, oxygen, and pollutants from reducing the quality of coffee.

The valve coffee bags allow air to escape from the packaging, making it easier for you to open and reseal the coffee bag. Coffee manufacturers typically place a valve at the bottom of the coffee bag. Typically, they are circular and located at the bottom corner of the bag. Once you open a coffee bag, you can reseal it with a valve.

How Does One-way Valve Work in Valve Coffee Bags?

More than 800 aroma components contribute to the unique quality of coffee. Roasted coffee is very sensitive to oxygen.

Therefore, coffee should be packaged in an airtight environment after processing. Even so, roasted coffee can release baking gas, causing the packaging to crack or expand the sealed packaging. For this reason, coffee packaging must have a degassing valve attachment to help provide an airtight environment.

The degassing valve consists of a valve membrane, a valve plate, and a valve body. This function can cause the membrane to expand when the product stored in the bag produces a slight overpressure of gas. As the gas accumulates, the baking gas reaches a specific pressure, causing the membrane to rise in the position of the degassing valve plate. Next, push the degassing valve plate from the inside to the outside until a channel is formed. The valve then closes, and the diaphragm rests against the valve body. Excess gas leaks out through the valve.

The products in the packaging are well protected from external oxidation. The degassing valve will automatically open when the pressure inside the coffee bag is higher than the pressure outside the coffee bag. If the pressure does not change, the bag will not open, so external air will not leave the bag. Moreover, this occurs after compensating for pressure and successfully venting the gas.



As you can see, degassing valves provide a perfect solution for packaging degassing valves. The one-way valve coffee bag prevents the entry of oxygen while maximizing freshness and flavor and helps effectively lock in the charming aroma of coffee. Combining the most advanced printing capabilities, these coffee valve bags can be uniquely customized in shape and design upon request.

The one-way valve suits all coffee bag products, such as ground coffee, raw coffee beans, and dark roasted coffee packaging. Excellent one-way valve suppliers can also provide a range of one-way valve coffee bags in size, shape, and capacity to meet all customer customization requirements.

Which features represent an excellent quality one-way valve?

Let's tell you some judgment bases to help you systematically determine what one-way valves are worth purchasing.

• Highest printability
• An ideal one-way valve that allows carbon dioxide gas to escape but does not allow external air to enter the bag.
• Higher burst strength and puncture resistance
• Higher temperature tolerance
• Strong oil and solvent resistance
• Designed to maintain oxygen, moisture, steam, ultraviolet rays, bacteria, and other pollutants in coffee beans.
• Excellent formability, peelability, and thermal stability properties
• Excellent mechanical properties at low thicknesses
• Cost-effectiveness
• Low leakage rate and high filling rate
• Additional functions are available, such as tear notches, hanging holes, rounded corners, etc.

From the perspective of a coffee packaging supplier, we recommend purchasing coffee bags with high-quality one-way valves as much as possible. Although this may mean we need to spend more on packaging materials, imagine that if you use a cheaper valve with less stable quality, you may risk losing a whole bag of coffee beans. After all, a valve can be much cheaper than a whole bag of coffee beans.

Expak can provide various coffee bags with imported high-quality one-way valves to maximize your packaging needs. If interested, please move to our coffee bag product page system to view it.

https://www.expakchina.com/cups---lids-supply/coffee-bag-893.asp


Publication Date: 3/28/2023

Category: Product Events