Why does the coffee bag have a small hole? what's the reason?

(1)。 Bagged:

Bags are generally divided into: non-airtight packaging, vacuum packaging, one-way valve packaging, pressure packaging.

Non-airtight packaging:

It is actually a temporary package that is only used for short-term storage.

Vacuum packing:

Roasted coffee beans need to be placed for a period of time and then packaged to prevent carbon dioxide damage to the packaging, which can be stored for about 10 weeks.

One-way valve packaging:

Adding an one-way valve to the bag allows the carbon dioxide produced to be removed but will block the entry of external gas, ensuring that the coffee beans are not oxidized but not preventing the loss of aroma. This kind of packaging can be stored for up to 6 months. There are also some coffee using exhaust hole packaging, that is, only making exhaust holes on the bag without adding an one-way valve, so that once the carbon dioxide produced by coffee beans is emptied, the external air will enter the bag, resulting in oxidation, so its storage time will be greatly reduced.

Pressure packing:

The coffee beans are vacuum packed and sealed with inert gas soon after they are roasted. This kind of packaging ensures that the coffee beans are not oxidized, the aroma is not lost, and the packaging is strong enough to ensure that the packaging will not be damaged by air pressure and can be stored for up to two years.

(2)。 Canned:

The cans are generally of two types: metal and glass, all of which are equipped with plastic lids for easy sealing.

Instant coffee packaging

Instant coffee packaging is relatively simple, generally using sealed small bags, mainly to long strips, but also equipped with outer packing boxes. Of course, there are also some canned instant coffee on the market.

1. Roasted coffee beans are sealed and packaged with aluminum foil bags, which can prevent coffee beans from coming into contact with light and air and lead to rapid aroma and oxidation.

2. Roasted coffee beans will naturally emit carbon dioxide (CO2), such as the accumulation in the bag will affect the quality of coffee beans, and the vent on the exhaust valve on the bag can let the excess gas out of the bag, and the coffee can squeeze the bag to smell the fragrance.

3. The vent hole of the "exhaust valve" of the coffee bag can isolate the light and air from outside the bag, so that the coffee beans can keep the fresh original taste of the coffee beans under the best condition of preservation and packaging.