Some things to know about coffee bags

Coffee bags are containers used to package coffee beans or ground coffee, which are usually made up of multiple layers of material, each of which serves a specific function to maintain the freshness and quality of the coffee. The composition of coffee bags can be divided into two parts: the outer packaging and the inner packaging.

The outer packaging

Regarding bag materials, common coffee bag materials include paper bags, aluminum foil bags, and plastic bags. Paper bags are mostly used for ordinary commercially available coffee, with good biodegradability and environmental friendliness. Aluminum foil bags are commonly used for coffee with high freshness requirements, and their hierarchical structure can effectively isolate the entry of oxygen and light. Plastic bags are commonly used for quick brewing instant coffee or small packages of coffee beans.

Outer layer: The outer layer is usually made of polyester (PET) or polyethylene (PE) material, which has good light and water resistance and protects the coffee inside from UV rays and moisture.

Aluminum foil layer: The aluminum foil layer is located between the outer and inner packaging layers and is usually made of an aluminum foil composite material. The aluminum foil protects the coffee beans or powder from oxidation and humidity by effectively insulating them from outside oxygen, light, and moisture.

External packaging design: There is usually various information on the external packaging, such as coffee brand, place of origin, production area, degree of roasting, flavor characteristics, etc. There is also some creative packaging that will add artistic patterns, text descriptions, and other elements.

The inner packaging

Inner packaging layer: The inner packaging layer is usually made of polyethylene (PE) or polyester (PET) material, which provides a good seal and maintains the freshness of the coffee. If required, the inner layer can also be protected from humidity by adding a moisture barrier.

Sealing device: Coffee bags usually have a layer of sealing device inside the bag, such as a sealable zip, heat seal, etc., to maintain the freshness of the coffee and prevent the entry of oxygen, moisture, and other external factors. Some coffee bags are also equipped with a resealable zip or heat seal, which makes it easy to open and reseal the bag to maintain the freshness of the coffee.

Anti-moisture materials: Some high-quality coffee bags will incorporate anti-moisture materials inside, such as moisture-proof paper and moisture absorbers, to prevent coffee from deteriorating due to moisture.

Gas emission device: Some bags will also incorporate a gas emission device, such as a carbon dioxide emission valve, which allows the carbon dioxide produced during the packaging process to be emitted to maintain the freshness of the coffee.

It should be noted that different types of coffee bag materials and structures will also have different applicable occasions and preservation effects. Meanwhile, coffee should be stored in a dry, light-proof, moisture-proof, and cool place to prolong its freshness and maintain its flavor.

About the role of the coffee air valve

A coffee air valve, a CO2 vent valve, is used in coffee bags. Its main purpose is to allow the carbon dioxide produced during the packaging process of coffee to be vented to keep the coffee fresh. Here are some of the advantages of coffee air valves:

1. Freshness preservation performance: The coffee air valve can timely vent out the carbon dioxide generated inside the coffee, preventing the gas pressure inside the package from being too high, thus maintaining the freshness of the coffee. Coffee releases a large amount of carbon dioxide after roasting, which can cause the bag to expand and burst if there is no proper venting channel.
2. Moisture-proof performance: The coffee air valve is well-designed, which can keep the air circulation inside the bag and avoid the accumulation of moisture inside the bag, thus reducing the possibility of moisture in the coffee beans.
3. Preservation of flavor: By emitting carbon dioxide promptly, the coffee valve prevents excessive oxidation or mold from occurring in the coffee, thus preserving the flavor and aroma of the beans.
4. Simplicity and ease of use: Coffee air valves are generally integrated directly into the packaging of the coffee bag, making them very easy to use and requiring no additional handling. Open the bag, and the air valve works automatically without additional operation or tools.

In summary, coffee air valves play an important role in preserving and maintaining the flavor of coffee and are an essential part of high-quality coffee packaging.

Types of Coffee Bags

Coffee bags can be classified according to different closures and shapes. The following are some of the common categories of coffee bags:

1. Stand-up pouches: Stand-up pouches are coffee bags with a flat bottom structure that can stand independently without leaning on other supports. Stand-up pouches usually come with a zip or heat seal that can be opened and closed multiple times, making them very convenient.


2. Eight-sided bag: An eight-sided bag is a type of coffee bag closure with eight side seals, giving the bag an octagonal appearance. This type of bag usually uses a heat seal or vest sealing process, which can seal the coffee inside well and prevent the intrusion of oxygen and moisture from outside.


3. Four-Side Seal Bags: Four Side Seal Bags are a common way of sealing coffee bags, which uses a heat seal or vest sealing process with four corner seals. The shape of the four-sided seal bag is rectangular and easy to stack and store.


4. Three-dimensional bag: A three-dimensional bag is a richer shape than a coffee bag; it adopts the heat seal or vest sealing process on both sides to add some side seals so the bag has a three-dimensional sense. This bag has a larger capacity and is suitable for packaging many coffee beans or powders.

In addition, there are also some special-shaped coffee bags, such as cylindrical bags, three-sided seal bags, etc. They provide different packaging options for coffee according to different needs and design styles.


Publication Date: 10/17/2023

Category: Product Events