Customized Label Coffee Powder Bag VMPET Box Bottom Zipper Pouch

Customized Label Plastic Coffee Bag Box Bottom Pouch Without Zipper

What’s the holes on coffee bags?

Friends who often buy coffee beans will find that the structure of the coffee packaging bag is very special, and there will be several "holes" on the top of the bag, so what is the mystery of the coffee packaging bag?

In fact, these "holes" have a name called "one-way exhaust valve". As the name implies, it allows the air on one side to move to the other side, while blocking the air on the other side from entering this side.

Why coffee bags need a valve?

Because when the coffee is freshly roasted, it can be packaged in a bag after cooling down to room temperature. While coffee is in a very fresh state, the beans slowly emit carbon dioxide. And if it is completely sealed, the packaging bag will be inflated by the gas and burst.

Therefore, a valve is needed to discharge the gas inside and block the entry of outside air. When the carbon dioxide gas produced by the coffee beans sealed in the bag makes the bag reach a certain pressure, the gas can push the exhaust valve sheet from the inside to the outside, and discharge the excess gas to the outside;

The valve closes automatically when the pressure in the bag is reduced enough to open the valve plate. And the valve will automatically open only when the pressure inside the bag is higher than the pressure outside the bag, otherwise it will not open, and the outside air cannot enter the bag. Occasionally, the release of a large amount of carbon dioxide can burst the coffee bean packaging, and the one-way exhaust valve can prevent this from happening.

Squeezing a coffee bag to smell is the wrong thing to do

When the carbon dioxide is discharged, the aroma of coffee beans will also be released in large quantities. Therefore, when buying coffee beans, some customers will squeeze the coffee packaging bag to smell the aroma to judge whether it belongs to their favorite coffee. And this action will affect the quality of the coffee.

Because these carbon dioxide is actually one of the factors that keep the coffee beans fresh, the air pressure in the bag can also help the beans, and the squeezing action will also lose the aroma of the coffee beans and affect the quality of the coffee beans, so try to avoid squeezing the coffee bag to smell its fragrance.

1. What's the lead time?
Generally 12 working days for digital prinitng bags, 25 working days for gravure prinitng bags, if need quantity more, then lead time a little longer.

2. What's your MOQ?
5000 PCS for each size or design.

3. Can you do custom printing?
Yes, we are manufacturer since 2003, we always accept custom printing.

4. Is your bag food grade? 
Yes, all materials we use are food grade, meet EU Standard, FDA request.
Heat sealable, sealed by heat sealer & locked by resealable zipper.

5. Can I get some samples?
Sure, FREE samples could be sent for quality reference, you only need to pay USD35 to our PayPal account: sales@bnpak.com. Samples will be sent out within 1 working day.

Welcome to send inquiry!