Why do coffee bags have so many small holes? In order for everyone to smell and understand the flavor of coffee? No, no!
I don't know if you have noticed that before drinking red wine, people will pour the wine into the decanter to decanter, in fact, the wine decanter process is the gradual oxidation process of red wine. The same goes for coffee, which releases carbon dioxide during coffee cultivation. Freshly roasted coffee is not immediately ready for production, and it takes several days to get a good coffee flavor.
Why is carbon dioxide still present in roasted coffee beans?
Freshly roasted coffee is full of vitality, which is reflected in the extract, which is so full of gas that it expands when it encounters water. flat bottom pouch manufacturers believe that coffee undergoes many different chemical reactions during roasting, complex carbohydrates are broken down into smaller molecules, beans start to turn brown, and large amounts of water vapor and carbon dioxide are produced, which is when the so-called "small holes in the coffee bag" come into play.
The hole on the coffee bean bag is a one-way exhaust valve, because the coffee bean will release carbon dioxide after roasting. If the one-way exhaust valve is not installed, the bag will swell, and even cause bag explosion in serious cases. Oxygen cannot enter the inner bag from the one-way exhaust valve, but excess gas can be discharged through it.
Carbon dioxide out or in coffee beans? What is the function of coffee permeator valve?
After coffee beans are roasted, fresh coffee beans will also emit carbon dioxide gas, especially the deep-roasted coffee beans. The exhaust gas of the coffee beans is quite vigorous, and the exhaled coffee beans will slowly inflate the bean bags. If the beans are fully sealed, the bean bags will expand excessively.
However, the quality of one-way ventilation valves on the market is different. With poor quality exhaust valves, in addition to the gas in the bag, the oxygen outside will also enter the coffee bean bag. Once the oxygen touches the coffee bean, it will begin to age and its freshness will decline.
In order to avoid the risk of premature aging of beans exposed to oxygen, the beans should be stored in a bag without air valve for the best preservation. Beans should be stored in a bean bag immediately when they are fresh after roasting. In the unopened state, the coffee freshness can be checked through the appearance of the bean bag with or without puffiness, and the coffee aroma can be effectively maintained.
In fact, freshly roasted beans need to maintain proper contact with the air for a certain period of time. Coffee beans without proper cultivation will have defects in flavor. This feeling is just like talking to a person who is not awake yet and looking at his or her sleepy eyes, which will make him or her uncomfortable and lose the desire to communicate.
How long do you need to age freshly roasted beans? The length of time to raise beans depends more on the degree of roasting and extraction method. For shallow coffee that is extracted with utensils, it can be raised for 1 to 3 days, while for dark coffee that is extracted with an espresso machine, it needs 3 to 5 days.
Raised coffee beans should be sealed and stored as soon as possible. In other words, the beauty will grow old and the flowers will not turn red for a hundred days. Generally, the coffee bean flavor at its peak can only last for 2-3 weeks, but not more than 1 month. Therefore, we can also believe that the freshness period of coffee beans is 1 month. Therefore, it is suggested to store coffee beans in bean bags without exhaust valves or in sealed cans, so as to prolong the aroma of coffee.